SW
C1
10 µF
L1
4.7 µH
VBAT
VOUT
FB
C2
10 µF
EN
GND
TPS61070
VO
3.3VUp To
100mA
R1
R2
0.9-V T
oV
O
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
www.ti.com
SLVSAA5 –MAY 2010
90% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 600-mA SWITCH
1FEATURES
• Qualified for Automotive Applications • Input Voltage Range: 0.9 V to 5.5 V
• 90% Efficient Synchronous Boost Converter • Adjustable Output Voltage Up to 5.5 V
– 75-mA Output Current at 3.3 V From 0.9-V • Power-Save Mode Version Available for
Input Improved Efficiency at Low Output Power
– 150-mA Output Current at 3.3 V From 1.8-V • Load Disconnect During Shutdown
Input • Overtemperature Protection
• Device Quiescent Current: 19 µA (Typ) • Small 6-Pin Thin SOT23 Package
DESCRIPTION
The TPS6107x devices provide a power supply solution for products powered by either a one-cell, two-cell, or
three-cell alkaline, NiCd or NiMH, or one-cell Li-ion or Li-polymer battery. Output currents can go as high as 75
mA while using a single-cell alkaline, and discharge it down to 0.9 V. It can also be used for generating 5 V at
200 mA from a 3.3 V rail or a Li-ion battery. The boost converter is based on a fixed frequency,
pulse-width-modulation (PWM) controller using a synchronous rectifier to obtain maximum efficiency. At low load
currents the TPS61070 and TPS61073 enter the power-save mode to maintain a high efficiency over a wide load
current range. The power-save mode is disabled in the TPS61071 and TPS61072, forcing the converters to
operate at a fixed switching frequency. The maximum peak current in the boost switch is typically limited to a
value of 600 mA.
The TPS6107x output voltage is programmed by an external resistor divider. The converter can be disabled to
minimize battery drain. During shutdown, the load is completely disconnected from the battery. The device is
packaged in a 6-pin thin SOT23 package (DDC).
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
UNLESS OTHERWISE NOTED this document contains Copyright © 2010, Texas Instruments Incorporated
PRODUCTION DATA information current as of publication date.
Products conform to specifications per the terms of Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
SLVSAA5 –MAY 2010
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
ORDERING INFORMATION(1)
OUTPUT EN THRESHOLD
POWER- OPERATING PACKAGE
TAVOLTAGE REFERENCE PACKAGE(2) PART NUMBER
SAVE MODE FREQUENCY MARKING
DC/DC VOLTAGE
Product
Adjustable Enabled 1200 kHz VBAT TPS61070TDDCRQ1(3)
Preview
Adjustable Disabled 1200 kHz VBAT DAY TPS61071TDDCRQ1
-40°C to 6-Pin
Product
105°C TSOT23
Adjustable Disabled 600 kHz VBAT TPS61072TDDCRQ1(3)
Preview
Product
Adjustable Enabled 1200 kHz 1.8 V Logic TPS61073TDDCRQ1(3)
Preview
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
(3) Product Preview
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)(1)
TPS6107x
Input voltage range on SW, VOUT, VBAT, EN, FB -0.3 V to 7 V
Operating virtual junction temperature range, TJ-40°C to 150°C
Storage temperature range Tstg -65°C to 150°C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating
Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
DISSIPATION RATINGS TABLE(1)
THERMAL RESISTANCE DERATING FACTOR
POWER RATING
PACKAGE ABOVE
TA≤25°C
ΘJA ΘJB ΘJC TA= 25°C
DDC 130 °C/W 27 °C/W 41 °C/W 769 mW 7.7 mW/°C
(1) This thermal data is based on assembly of the device on a JEDEC high K board. Exceeding the maximum junction temperature will
force the device into thermal shutdown.
RECOMMENDED OPERATING CONDITIONS MIN NOM MAX UNIT
Supply voltage at VBAT, VI(TPS61070, TPS61071, TPS61072) 0.9 5.5 V
Supply voltage at VBAT, VI(TPS61073) 2.3 5.5 V
Operating free air temperature range, TA-40 105 °C
Operating virtual junction temperature range, TJ-40 125 °C
2Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
www.ti.com
SLVSAA5 –MAY 2010
ELECTRICAL CHARACTERISTICS
over recommended free-air temperature range and over recommended input voltage range (typical at an ambient temperature
range of 25°C) (unless otherwise noted)
DC/DC STAGE
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Minimum input voltage range for
start-up RL= 270 Ω1.1 1.25
(TPS61070, TPS61071, TPS61072)
Minimum input voltage range for RL= 270 Ω2.3
start-up (TPS61073)
VIV
Input voltage range, after start-up TA= 25°C 0.9 5.5
(TPS61070, TPS61071, TPS61072)
Input voltage range, after start-up 2.3 5.5
(TPS61073)
Output voltage range (TPS61070, 1.8 5.5
TPS61071, TPS61072)
VOV
Output voltage range (TPS61073) 2.3 5.5
V(FB) Feedback voltage TA= 25°C 490 500 510 mV
Oscillator frequency (TPS61070, 960 1200 1440
TPS61071, TPS61073)
f kHz
Oscillator frequency (TPS61072) 480 600 720
I(SW) Switch current limit VOUT= 3.3 V 455 600 735 mA
Start-up current limit 0.5 × ISW mA
Boost switch-on resistance VOUT= 3.3 V 480 mΩ
Rectifying switch-on resistance VOUT= 3.3 V 600 mΩ
Total accuracy (including line and 5%
load regulation)
Line regulation 1%
Load regulation 1%
VBAT 0.5 1
Quiescent current IO= 0 mA, V(EN) = VBAT = 1.2 V,
(TPS61070, TPS61071, 190(1) 300(1) µA
VOUT = 3.3 V, TA= 25°C
VOUT
TPS61072) 20(2)
VBAT 1 1.5
Quiescent current IO= 0 mA, V(EN) = 1.8 V, VBAT = 2.4 V, µA
(TPS61073) VOUT = 5 V, TA= 25°C
VOUT 30 50
Shutdown current (TPS61070, V(EN) = 0 V, VBAT = 1.2 V, TA= 25°C 0.05 0.5 µA
TPS61071, TPS61072)
Shutdown current (TPS61073) V(EN) = 0 V, VBAT = 3.6 V, TA= 25°C 0.05 1.5 µA
(1) Switching current
(2) Non-switching current
Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 3
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
SLVSAA5 –MAY 2010
www.ti.com
CONTROL STAGE
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V(UVLO) Undervoltage lockout threshold V(BAT) voltage decreasing 0.8 V
EN input low voltage 0.2 × VBAT
(TPS61070, TPS61071, TPS61072)
VIL EN input low voltage (TPS61073) 0.4 V
EN input high voltage 0.8 × VBAT
(TPS61070, TPS61071, TPS61072)
VIH EN input high voltage (TPS61073) 1.2 V
EN input current Clamped on GND or VBAT 0.01 0.1 µA
(TPS61070, TPS61071, TPS61072)
EN input current (TPS61073) Clamped on GND or VBAT 0.01 0.3 µA
Overtemperature protection 140 °C
Overtemperature hysteresis 20 °C
4Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated
1 3
46
2
5
A B C
SW ENGND
VOUTVBAT FB
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
www.ti.com
SLVSAA5 –MAY 2010
PIN ASSIGNMENTS
DDC PACKAGE
TOP VIEW
Terminal Functions
TERMINAL I/O DESCRIPTION
NAME NO.
EN 3 I Enable input (1/VBAT enabled, 0/GND disabled)
FB 4 I Voltage feedback for programming the output voltage
GND 2 IC ground connection for logic and power
SW 1 I Boost and rectifying switch input
VBAT 6 I Supply voltage
VOUT 5 O Boost converter output
Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 5
Gate
Control
GND
Regulator
Error
Amplifier
Control Logic Oscillator
Temperature
Control
VOUT
FB
SW
VBAT
EN
GND
_
+
Backgate
Control
Vmax
Control
VOUT 5 kΩ
3 pF
_
+
Vref = 0.5 V
GND
5 pF
50 kΩ160 kΩ
SW
C1
Power
Supply
L1
VBAT
VOUT
FB
C2
EN
GND
TPS6107x
ListofComponents:
U1= TPS61070DDC
L1=4.7µHWurthElektronik744031004
C1=2x4.7 µF,0603,X7R/X5RCeramic
C2=4x4.7 µF,0603,X7R/X5RCeramic
VCC
BoostOutput
R1
R2
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
SLVSAA5 –MAY 2010
www.ti.com
FUNCTIONAL BLOCK DIAGRAM (TPS61070)
Parameter Measurement Information
6Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated
0
10
20
30
40
50
60
70
80
90
100
0.01 0.10 1 10 100 1 k
VBAT = 1.2 V
TPS61070
VO = 1.8 V
TPS61071
VO = 1.8 V
IO − Output Current − mA
Efficiency − %
VBAT = 0.9 V
0
50
100
150
200
250
300
350
400
450
500
550
600
0.9 1.3 1.7 2.1 2.5 2.9 3.3 3.7 4.1 4.5 4.9
VI − Input Voltage − V
Maximum Output Current − mA
VO = 3.3 V
VO = 1.8 V VO = 5 V
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
www.ti.com
SLVSAA5 –MAY 2010
TYPICAL CHARACTERISTICS
Table of Graphs
FIGURE
Maximum output current vs Input voltage 1
vs Output current 2
vs Output current 3
Efficiency vs Output current 4
vs Input voltage 5
vs Input voltage 6
vs Output current 7
Output voltage vs Output current 8
No load supply current into VOUT vs Input voltage 9
Output voltage in continuous mode (TPS61071) 10
Output voltage in continuous mode (TPS61071) 11
Output voltage in power-save mode (TPS61070) 12
Output voltage in power-save mode (TPS61070) 13
Load transient response (TPS61071) 14
Load transient response (TPS61071) 15
Waveforms Line transient response (TPS61071) 16
Line transient response (TPS61071) 17
Start-up after enable (TPS61070) 18
Start-up after enable (TPS61070) 19
Start-up after enable (TPS61071) 20
Start-up after enable (TPS61071) 21
TYPICAL CHARACTERISTICS
MAXIMUM OUTPUT CURRENT EFFICIENCY
vs vs
INPUT VOLTAGE OUTPUT CURRENT
Figure 1. Figure 2.
Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 7
0
10
20
30
40
50
60
70
80
90
100
0.01 0.10 1 10 100 1 k
VBAT = 0.9 V
VBAT = 1.8 V
VBAT = 2.4 V
TPS61070
VO = 3.3 V
TPS61071
VO = 3.3 V
IO − Output Current − mA
Efficiency − %
0
10
20
30
40
50
60
70
80
90
100
0.01 0.10 1 10 100 1 k
TPS61070
VO = 5 V
TPS61071
VO = 5 V
VBAT = 1.2 V VBAT = 1.8 V
VBAT = 2.4 V
VBAT = 3.6 V
IO − Output Current − mA
Efficiency − %
50
55
60
65
70
75
80
85
90
95
100
0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5 2.7 2.9 3.1 3.3
IO = 5 mA
IO = 50 mA
IO = 100 mA
TPS61070
VO = 3.3 V
TPS61071
VO = 3.3 V
VI − Input Voltage − V
Efficiency − %
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
SLVSAA5 –MAY 2010
www.ti.com
TYPICAL CHARACTERISTICS (continued)
EFFICIENCY EFFICIENCY
vs vs
OUTPUT CURRENT OUTPUT CURRENT
Figure 3. Figure 4.
EFFICIENCY EFFICIENCY
vs vs
INPUT VOLTAGE INPUT VOLTAGE
Figure 5. Figure 6.
8Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated
3.20
3.25
3.30
3.35
1 10 100 1000
VBAT = 2.4 V TPS61070
VO = 3.3 V
TPS61071
VO = 3.3 V
IO − Output Current − mA
− Output Voltage − V
VO
4.8
4.85
4.9
4.95
5
5.05
5.1
110 100 1000
TPS61070
VO = 5 V
TPS61071
VO = 5 V
VBAT = 3.6 V
IO − Output Current − mA
− Output Voltage − V
VO
InductorCurrent
100mA/div
OutputVoltage
20mV/div
VI L O
=1.2V,R =33 ,V =3.3VW
t − Time − 1 s/divm
10
12
14
16
18
22
0.9 1.5 2.5 3.5 4.5 5.5
VI− Input Voltage − V
No Load Supply Current Into VOUT − Aµ
TA = 255C
20 TA = 855C
TA = −405C
VO = 3.3 V
VI = 0.9 V to 5.5 V
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
www.ti.com
SLVSAA5 –MAY 2010
TYPICAL CHARACTERISTICS (continued)
OUTPUT VOLTAGE OUTPUT VOLTAGE
vs vs
OUTPUT CURRENT OUTPUT CURRENT
Figure 7. Figure 8.
NO LOAD SUPPLY CURRENT INTO VOUT
vs TPS61071
INPUT VOLTAGE OUTPUT VOLTAGE IN CONTINUOUS MODE
Figure 9. Figure 10.
Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 9
Inductor Current
200 mA/div Output Voltage
20 mV/div
VI = 3.6 V, RL = 25 W, VO = 5 V
t − Time − 1 ms/div
Inductor Current
100 mA/div, DC Output Voltage
20 mV/div, AC
VI = 1.2 V, RL = 330 W, VO = 3.3 V
t − Time − 10 ms/div
Output Current
50 mA/div, DC
Output Voltage
50 mV/div, AC
VI = 1.2 V, IL = 20 mA to 80 mA, VO = 3.3 V
t − Time − 2 ms/div
Inductor Current
200 mA/div, DC Output Voltage
100 mV/div, AC
VI = 3.6 V, RL = 250 W, VO = 5 V
t − Time − 20 ms/div
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
SLVSAA5 –MAY 2010
www.ti.com
TYPICAL CHARACTERISTICS (continued)
TPS61071 TPS61070
OUTPUT VOLTAGE IN CONTINUOUS MODE OUTPUT VOLTAGE IN POWER-SAVE MODE
Figure 11. Figure 12.
TPS61070 TPS61071
OUTPUT VOLTAGE IN POWER-SAVE MODE LOAD TRANSIENT RESPONSE
Figure 13. Figure 14.
10 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated
Output Current
50 mA/div, DC
Output Voltage
50 mV/div, AC
VI = 3.6 V, IL = 20 mA to 80 mA, VO = 5 V
t − Time − 2 ms/div
Output Voltage
20 mV/div, AC Input Voltage
500 mV/div, AC
VI = 1.8 V to 2.4 V, RL = 33 W, VO = 3.3 V
t − Time − 2 ms/div
Output Voltage
50 mV/div, AC Input Voltage
500 mV/div, AC
VI = 3 V to 3.6 V, RL = 25 W, VO = 5 V
t − Time − 2 ms/div
Enable
5V/div
,DC
OutputVoltage
1V/div
,DC
InductorCurrent
200mA/div
,DC
VoltageatSW
2V/div
,DC
VI=2.4V,
RL=33 Ω,
VO=3.3V
t − Time − 200 µs/div
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
www.ti.com
SLVSAA5 –MAY 2010
TYPICAL CHARACTERISTICS (continued)
TPS61071 TPS61071
LOAD TRANSIENT RESPONSE LINE TRANSIENT RESPONSE
Figure 15. Figure 16.
TPS61071 TPS61070
LINE TRANSIENT RESPONSE START-UP AFTER ENABLE
Figure 17. Figure 18.
Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 11
Enable
5 V/div, DC
Output Voltage
2 V/div, DC
Inductor Current
200 mA/div, DC
Voltage at SW
2 V/div, DC
VI = 3.6 V,
RL = 50 W,
VO = 5 V
t − Time − 400 ms/div
Enable
5 V/div, DC
Output Voltage
1 V/div, DC
Inductor Current
200 mA/div, DC
Voltage at SW
2 V/div, DC
VI = 2.4 V,
RL = 33 W,
VO = 3.3 V
t − Time − 200 ms/div
Enable
5V/div
,DC
OutputVoltage
2V/div
,DC
InductorCurrent
200mA/div
,DC
VoltageatSW
2V/div
,DC
VI=3.6V,
RL=50 ,W
VO=5V
t − Time − 400 s/divm
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
SLVSAA5 –MAY 2010
www.ti.com
TYPICAL CHARACTERISTICS (continued)
TPS61070 TPS61071
START-UP AFTER ENABLE START-UP AFTER ENABLE
Figure 19. Figure 20.
TPS61071
START-UP AFTER ENABLE
Figure 21.
12 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
www.ti.com
SLVSAA5 –MAY 2010
DETAILED DESCRIPTION
CONTROLLER CIRCUIT
The controller circuit of the device is based on a fixed frequency multiple feedforward controller topology. Input
voltage, output voltage, and voltage drop on the NMOS switch are monitored and forwarded to the regulator. So,
changes in the operating conditions of the converter directly affect the duty cycle and must not take the indirect
and slow way through the control loop and the error amplifier. The control loop, determined by the error amplifier,
only has to handle small signal errors. The input for it is the feedback voltage on the FB pin. It is compared with
the internal reference voltage to generate an accurate and stable output voltage.
The peak current of the NMOS switch is also sensed to limit the maximum current flowing through the switch and
the inductor. The typical peak-current limit is set to 600 mA. An internal temperature sensor prevents the device
from getting overheated in case of excessive power dissipation.
Synchronous Rectifier
The device integrates an N-channel and a P-channel MOSFET transistor to realize a synchronous rectifier.
Because the commonly used discrete Schottky rectifier is replaced with a low RDS(on) PMOS switch, the power
conversion efficiency reaches values above 90%. A special circuit is applied to disconnect the load from the input
during shutdown of the converter. In conventional synchronous rectifier circuits, the backgate diode of the
high-side PMOS is forward biased in shutdown and allows current flowing from the battery to the output.
However, this device uses a special circuit which takes the cathode of the backgate diode of the high-side PMOS
and disconnects it from the source when the regulator is not enabled (EN = low).
The benefit of this feature for the system design engineer is that the battery is not depleted during shutdown of
the converter. No additional components must be added to the design to make sure that the battery is
disconnected from the output of the converter.
Device Enable
The device is put into operation when EN is set high. It is put into a shutdown mode when EN is set to GND. In
shutdown mode, the regulator stops switching, all internal control circuitry is switched off, and the load is isolated
from the input (as described in the Synchronous Rectifier Section). This also means that the output voltage can
drop below the input voltage during shutdown. During start-up of the converter, the duty cycle and the peak
current are limited in order to avoid high-peak currents drawn from the battery.
Undervoltage Lockout
An undervoltage lockout function prevents the device from operating if the supply voltage on VBAT is lower than
approximately 0.8 V. When in operation and the battery is being discharged, the device automatically enters the
shutdown mode if the voltage on VBAT drops below approximately 0.8 V. This undervoltage lockout function is
implemented in order to prevent the malfunctioning of the converter.
Soft Start and Short-Circuit Protection
When the device enables, the internal start-up cycle starts with the first step, the precharge phase. During
precharge, the rectifying switch is turned on until the output capacitor is charged to a value close to the input
voltage. The rectifying switch is current limited during this phase. The current limit increases with the output
voltage. This circuit also limits the output current under short-circuit conditions at the output. Figure 22 shows the
typical precharge current vs output voltage for specific input voltages:
Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 13
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.1
0.11
0.12
0.13
0.14
0.15
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
V -OutputVoltage-V
O
PrechargeCurrent- A
VBAT=1.2V
VBAT=1.8V
VBAT=2.4V VBAT=3.6V VBAT=5V
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
SLVSAA5 –MAY 2010
www.ti.com
Figure 22. Precharge and Short-Circuit Current
After charging the output capacitor to the input voltage, the device starts switching. If the input voltage is below
1.8 V, the device works with a fixed duty cycle of 70% until the output voltage reaches 1.8 V. After that the duty
cycle is set depending on the input output voltage ratio. Until the output voltage reaches its nominal value, the
boost switch current limit is set to 50% of its nominal value to avoid high peak currents at the battery during
start-up. As soon as the output voltage is reached, the regulator takes control, and the switch current limit is set
back to 100%.
Power-Save Mode
The TPS61070 and TPS61073 are capable of operating in two different modes. At light loads, when the inductor
current becomes zero, they automatically enter the power-save mode to improve efficiency. In the power-save
mode, the converters only operate when the output voltage trips below a set threshold voltage. It ramps up the
output voltage with one or several pulses and returns to the power-save mode once the output voltage exceeds
the set threshold voltage. If output power demand increases and the inductor current no longer goes below zero,
the device again enters the fixed PWM mode. In this mode, there is no difference between the PWM only
versions TPS61071 and TPS61072 and the power-save mode enabled versions TPS61070 and TPS61073.
14 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated
R1 +R2 ǒVO
VFB *1Ǔ+180 kW ǒVO
500 mV *1Ǔ
CparR1 +3 pF ǒ200 kW
R2 *1Ǔ
SW
C1
Power
Supply
L1
VBAT
VOUT
FB
C2
EN
GND
TPS61070
VCC
BoostOutput
R1
R2
IL+IO VOUT
VBAT 0.8
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
www.ti.com
SLVSAA5 –MAY 2010
APPLICATION INFORMATION
DESIGN PROCEDURE
The TPS6107x dc/dc converters are intended for systems powered by a single-cell, up to triple-cell alkaline,
NiCd, NiMH battery with a typical terminal voltage between 0.9 V and 5.5 V. They can also be used in systems
powered by one-cell Li-ion or Li-polymer with a typical voltage between 2.5 V and 4.2 V. Additionally, any other
voltage source with a typical output voltage between 0.9 V and 5.5 V can power systems where the TPS6107x is
used. Due to the nature of boost converters, the output voltage regulation is only maintained when the input
voltage applied is lower than the programmed output voltage.
Programming the Output Voltage
The output voltage of the TPS6107x dc/dc converter can be adjusted with an external resistor divider. The typical
value of the voltage at the FB pin is 500 mV. The maximum recommended value for the output voltage is 5.5 V.
The current through the resistive divider should be about 100 times greater than the current into the FB pin. The
typical current into the FB pin is 0.01 µA, and the voltage across R2 is typically 500 mV. Based on those two
values, the recommended value for R2 should be lower than 500 kΩ, in order to set the divider current at 1 µA or
higher. Because of internal compensation circuitry, the value for this resistor should be in the range of 200 kΩ.
From that, the value of resistor R1, depending on the needed output voltage (VO), is calculated using Equation 1:
(1)
For example, if an output voltage of 3.3 V is needed, a 1 MΩresistor should be chosen for R1. If for any reason
the value chosen for R2 is significantly lower than 200 kΩ, additional capacitance in parallel to R1 is
recommended, if the device shows instable regulation of the output voltage. The required capacitance value is
calculated using Equation 2:
(2)
Figure 23. Typical Application Circuit for Adjustable Output Voltage Option
Inductor Selection
A boost converter normally requires two main passive components for storing energy during the conversion. A
boost inductor and a storage capacitor at the output are required. To select the boost inductor, it is
recommended to keep the possible peak inductor current below the current limit threshold of the power switch in
the chosen configuration. For example, the current limit threshold of the TPS6107x's switch is 600 mA. The
highest peak current through the inductor and the switch depends on the output load, the input (VBAT), and the
output voltage (VOUT). Estimation of the maximum average inductor current is done using Equation 3:
(3)
For example, for an output current of 75 mA at 3.3 V, at least 340 mA of average current flows through the
inductor at a minimum input voltage of 0.9 V.
Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 15
L+VBAT (VOUT *VBAT)
DIL ƒ VOUT
Cmin +IO ǒVOUT *VBATǓ
ƒ DV VOUT
DVESR +IO RESR
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
SLVSAA5 –MAY 2010
www.ti.com
The second parameter for choosing the inductor is the desired current ripple in the inductor. Normally, it is
advisable to work with a ripple of less than 20% of the average inductor current. A smaller ripple reduces the
magnetic hysteresis losses in the inductor, as well as output voltage ripple and EMI. But in the same way,
regulation time rises at load changes. In addition, a larger inductor increases the total system costs. With these
parameters, it is possible to calculate the value for the inductor by using Equation 4:
(4)
Parameter fis the switching frequency and ΔILis the ripple current in the inductor, i.e., 40% ΔIL. In this example,
the desired inductor has the value of 4 µH. With this calculated value and the calculated currents, it is possible to
choose a suitable inductor. In typical applications, a 4.7 µH inductance is recommended. The device has been
optimized to operate with inductance values between 2.2 µH and 10 µH. Nevertheless, operation with higher
inductance values may be possible in some applications. Detailed stability analysis is then recommended. Care
must be taken because load transients and losses in the circuit can lead to higher currents as estimated in
Equation 4. Also, the losses in the inductor caused by magnetic hysteresis losses and copper losses are a major
parameter for total circuit efficiency.
The following inductor series from different suppliers have been used with the TPS6107x converters:
Table 1. List of Inductors
VENDOR INDUCTOR SERIES
VLF3010
TDK VLF4012
744031xxx
Wurth Elektronik 744042xxx
EPCOS B82462-G4
SD18
Cooper Electronics Technologies SD20
CB2016B xxx
Taiyo Yuden CB2518B xxx
Capacitor Selection
Input Capacitor
At least a 10 µF input capacitor is recommended to improve transient behavior of the regulator and EMI behavior
of the total power supply circuit. A ceramic capacitor or a tantalum capacitor with a 100-nF ceramic capacitor in
parallel, placed close to the IC, is recommended.
Output Capacitor
The major parameter necessary to define the output capacitor is the maximum allowed output voltage ripple of
the converter. This ripple is determined by two parameters of the capacitor, the capacitance and the ESR. It is
possible to calculate the minimum capacitance needed for the defined ripple, supposing that the ESR is zero, by
using Equation 5:
(5)
Parameter fis the switching frequency and ΔV is the maximum allowed ripple.
With a chosen ripple voltage of 10 mV, a minimum capacitance of 4.5 µF is needed. In this value range, ceramic
capacitors are a good choice. The ESR and the additional ripple created are negligible. It is calculated using
Equation 6:
(6)
16 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated
A(REG) +d
V(FB) +5 (R1 )R2)
R2 (1 )i w 0.8 ms)
SW
C1
Power
Supply
L1
VBAT
VOUT
FB
C2
EN
GND
TPS6107x
ListofComponents:
U1= TPS61070DDC
L1= 4.7µHWurthElektronik744031004
C1=2x4.7 µF
,0603,X7R/X5RCeramic
C2=2x4.7 µF
,0603,X7R/X5RCeramic
VCC
BoostOutput
R1
R2
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
www.ti.com
SLVSAA5 –MAY 2010
The total ripple is the sum of the ripple caused by the capacitance and the ripple caused by the ESR of the
capacitor. Additional ripple is caused by load transients. This means that the output capacitor has to completely
supply the load during the charging phase of the inductor. The value of the output capacitance depends on the
speed of the load transients and the load current during the load change. With the calculated minimum value of
4.5 µF and load transient considerations, the recommended output capacitance value is in a 10 µF range.
Care must be taken on capacitance loss caused by derating due to the applied dc voltage and the frequency
characteristic of the capacitor. For example, larger form factor capacitors (in 1206 size) have their self resonant
frequencies in the same frequency range as the TPS6107x operating frequency. So the effective capacitance of
the capacitors used may be significantly lower. Therefore, the recommendation is to use smaller capacitors in
parallel instead of one larger capacitor.
Small Signal Stability
To analyze small signal stability in more detail, the small signal transfer function of the error amplifier and the
regulator, which is given in Equation 7, can be used:
(7)
Layout Considerations
As for all switching power supplies, the layout is an important step in the design, especially at high-peak currents
and high switching frequencies. If the layout is not carefully done, the regulator could show stability problems as
well as EMI problems. Therefore, use wide and short traces for the main current path and for the power ground
tracks. The input capacitor, output capacitor, and the inductor should be placed as close as possible to the IC.
Use a common ground node for power ground and a different one for control ground to minimize the effects of
ground noise. Connect these ground nodes at any place close to the ground pin of the IC.
The feedback divider should be placed as close as possible to the ground pin of the IC. To lay out the control
ground, it is recommended to use short traces as well, separated from the power ground traces. This avoids
ground shift problems, which can occur due to superimposition of power ground current and control ground
current.
APPLICATION EXAMPLES
Figure 24. Power Supply Solution for Maximum Output Power Operating from a Single or
Dual Alkaline Cell
Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 17
SW
C1
Power
Supply
L1
VBAT
VOUT
FB
C2
EN
GND
TPS6107x
ListofComponents:
U1= TPS61070DDC
L1= 4.7µH Taiyo YudenCB2016B4R7M
C1=1x4.7 µF
,0603,X7R/X5RCeramic
C2=2x4.7 µF
,0603,X7R/X5RCeramic
VCC
BoostOutput
R1
R2
SW
C1
Power
Supply
L1
VBAT
VOUT
FB
C2
EN
GND
TPS6107x
ListofComponents:
U1= TPS61070DDC
L1= 4.7µH Taiyo YudenCB2016B4R7M
C1=1x4.7µF,0603,X7R/X5RCeramic
C2=2x4.7µF
,0603,X7R/X5RCeramic
LEDCurrent
Up To30mA
R1
D1
C5
0.1 µF
DS1
C6
1 µF
VCC2 ~2xVCC
Unregulated
AuxiliaryOutput
SW
C1
Power
Supply
L1
VBAT
VOUT
FB
C2
EN
GND
TPS6107x
ListofComponents:
U1= TPS61070DDC
L1=
4.7µHWurthElektronik744031004
C1=2x4.7 µF,0603,X7R/X5RCeramic
C2=2x4.7 µF,0603,X7R/X5RCeramic
VCC
BoostOutput
R1
R2
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
SLVSAA5 –MAY 2010
www.ti.com
Figure 25. Power Supply Solution Having Small Total Solution Size
Figure 26. Power Supply Solution for Powering White LEDs in Lighting Applications
Figure 27. Power Supply Solution With Auxiliary Positive Output Voltage
18 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated
C5
0.1 µF
DS1 C6
1 µ
F
VCC2 ~−VCC
Unregulated
AuxiliaryOutput
SW
C1
Power
Supply
L1
VBAT
VOUT
FB
C2
EN
GND
TPS6107x
ListofComponents:
U1= TPS61070DDC
L1= 4.7µHWurthElektronik744031004
C1=2x4.7 µF
,0603,X7R/X5RCeramic
C2=2x4.7 µF
,0603,X7R/X5RCeramic
VCC
BoostOutput
R1
R2
PD(MAX) +TJ(MAX) *TA
RqJA +125°C*85°C
130 °CńW+308 mW
TPS61070-Q1, TPS61071-Q1
TPS61072-Q1, TPS61073-Q1
www.ti.com
SLVSAA5 –MAY 2010
Figure 28. Power Supply Solution With Auxiliary Negative Output Voltage
THERMAL INFORMATION
Implementation of integrated circuits in low-profile and fine-pitch surface-mount packages typically requires
special attention to power dissipation. Many system-dependent issues such as thermal coupling, airflow, added
heat sinks and convection surfaces, and the presence of other heat-generating components affect the
power-dissipation limits of a given component.
Three basic approaches for enhancing thermal performance follow.
• Improving the power dissipation capability of the PCB design
• Improving the thermal coupling of the component to the PCB
• Introducing airflow in the system
The maximum recommended junction temperature (TJ) of the TPS6107x devices is 125°C. The thermal
resistance of the 6-pin thin SOT package (DDC) is RΘJA = 130°C/W. Specified regulator operation is assured to a
maximum ambient temperature TAof 85°C. Therefore, the maximum power dissipation is about 308 mW. More
power can be dissipated if the maximum ambient temperature of the application is lower.
(8)
Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 19
PACKAGING INFORMATION
Orderable Device Status (1) Package
Type Package
Drawing Pins Package
Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
TPS61071TDDCRQ1 ACTIVE SOT DDC 6 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF TPS61071-Q1 :
•Catalog: TPS61071
NOTE: Qualified Version Definitions:
•Catalog - TI's standard catalog product
PACKAGE OPTION ADDENDUM
www.ti.com 16-Apr-2010
Addendum-Page 1
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
TPS61071TDDCRQ1 SOT DDC 6 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
PACKAGE MATERIALS INFORMATION
www.ti.com 20-Jul-2010
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
TPS61071TDDCRQ1 SOT DDC 6 3000 203.0 203.0 35.0
PACKAGE MATERIALS INFORMATION
www.ti.com 20-Jul-2010
Pack Materials-Page 2
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