Linear Technology Corporation • 1630 McCarthy Blvd. • Milpitas, CA 95035-7417 • (408) 432-1900 • www.linear-tech.com • Literature Only: 1-800-4-LINEAR
, LTC and LT are registered trademarks of Linear Technology Corporation
Cellular Telephones
Power Management and Signal Conditioning
InfoCard 19
Rev B 0300
CC/CV
BATTERY
CHARGER
LT1571-5
LTC1730
LTC1731
TRANSMITTER
INFRARED
INTERFACE
LT1328
GaAs FET
BIAS
GENERATOR
LTC1550
LTC1550L
XMTR
PWR
DC INPUT
VBATT
POWER
CONTROL
RCVR
PWR
BASE-
BAND
PWR
1.8V
SIM
INTERFACE
LTC1555
LTC1755
LTC1986
1 2 3
4 5 6
7 8 9
*0#
µC
AND
DSP
SIGNALS5V 5V
BASEBAND
SIGNAL
PROCESSING
VCO
POWER SUPPLY
LTC1682
LTC1982
RF
ON/OFF
GAIN
Li-Ion
Li-Ion
PROTECTOR
ANTENNA
SWITCH/
DIPLEXER
PA
BUCK DC/DC
CONVERTER
LTC1503
LTC1701
LTC1878
OPTIONAL*
STEP-UP
CONVERTER
LT1619
LTC1872
LOW NOISE
LDO REGULATOR
LT1761
LOW NOISE
LDO REGULATOR
LT1761
LOW NOISE
LDO REGULATOR
LT1761
SIM
FREQUENCY
SYNTHESIZER
RECEIVER
*FOR 2-CELL NiMH DESIGNS
DUAL BAND
PA POWER
CONTROL
LTC1757
LCD BIAS
LT1615
LT1617
LED BACKLIGHT
LTC1682
LTC1751-5
LTC1754-5
LCD
DISPLAY
Cellular Telephones
Power Management and Signal Conditioning
InfoCard 19
2
Battery Chargers for NiMH and Li-Ion
■
Precision Constant-Current/Constant-Voltage Control
■
Only One Low Cost Resistor Required to Program Charge Current
■
Tiny, Thermally Enhanced Packages
LT1510/LT1512/LT1571:
■
High Switching Frequency for Small Inductor Size
■
High Efficiency Current Mode PWM
■
Battery Negative Terminal May Be Tied Directly to Ground
■
LT1571 Has Preset Outputs: 4.1V, 4.2V, 8.2V, 8.4V
LTC1730 Pulse Charger, LTC1731/
LTC1732 Linear Chargers:
■
Programmable Charge Termination Timer
■
End of Charge Detection Output
■
Automatic Trickle Charge of Low Voltage Cells
■
Fixed Outputs for Li-Ion Cell Voltages
■
Automatic Battery Refresh (LTC1730/LTC1732)
■
Battery Temperature Sensing (LTC1730)
Characteristics LT1510-5 LT1512 LT1571-5 LTC1730 LTC1731 LTC1732
Max Charging Current 1.5A 1A 1.5A 1A* 1A** 1A**
Switching Frequency/Type 500kHz 500kHz
†
500kHz Pulse Linear Linear
Charges Li-Ion Cells
Charges NiCd and NiMH
Charge Completion Flag
Charge Termination Timer
Automatic Trickle Charge
Automatic Battery Refresh
Battery Temp Sensing
Soft-Start with UVLO
Automatic Sleep Mode
V
BAT
Maximum 20V 20V
††
20V 13.2V 15V 15V
Up to 28V Wall Adapter
Packages SSOP-16 SO-8 SSOP-16 SO-8 MSOP-8 MSOP-10
SSOP-28 SO-8
*An external FET may be added for higher charge current
†
Can be synchronized up to 800kHz
**Dependent upon external MOSFET selection
††
SEPIC operation for step-up and step-down
V
CC
V
IN
5V TO 15V
SENSE
DRV
1k R
SENSE
0.2Ω
R
PROG
*
19.6k Li-ION
CELL
LTC1731-4.2
*SHUTDOWN INVOKED BY FLOATING THE PROG PIN
BAT
CHRG
8
7
MBRM120T3
10µF
1731 TA01
1µF
I
BAT
= 500mA
C
TIMER
0.1µF
Q1
Si9430DY
6
1
5
4
+
2
3TIMER
PROG
GND
500mA Li-Ion Charger
SW
V
CC
PROG
6.19k
100k
V
IN
8.2V
TO 20V
CHARGE
COMPLETE
+
1571 F01
C1
0.22µF
C
IN
*
10µFL1**
10µH
LT1571-5
D1
MBRM120T3
D3
MBRM120T3
V
DD
D2
MMBD914L
SELECT
SENSE
GND
CAP
4.2V
Li-Ion
BATTERY
0.33µF
0.1µF
1k
1µF
TOKIN OR MARCON CERAMIC SURFACE MOUNT
COILTRONICS TP3-100, 10µH, 2.2mm HEIGHT (0.8A CHARGING CURRENT)
COILTRONICS TP1 SERIES, 10µH, 1.8mm HEIGHT (<0.5A CHARGING CURRENT)
PANASONIC EEFCD1B220
*
**
***
BOOST
C
OUT
***
22µF
+
V
C
BAT
BAT2
FLAG
300Ω
Compact Li-Ion Cell Phone Charger (0.8A)
Battery Charger Selection Guides
Small, Simple
Complete Li-Ion
Battery Charger
Cellular Telephones
Power Management and Signal Conditioning
InfoCard 19
3
Low Voltage Step-Down DC/DC Converters
LTC1878: 600mA, Synchronous Buck Switching Regulator
■No Schottky Diode Required
■Selectable Burst ModeTM Operation
■Low Dropout: To 100% Duty Cycle
■Shutdown Mode IQ: 1µA
■8-Lead MSOP Package
Burst Mode is a trademark of Linear Technology Corporation.
Efficiency vs Output Load Current
(Burst Mode Operation Selected)
High Efficiency Step-Down Converter
LTC1503: High Efficiency Inductorless Step-Down DC/DC Converter
■Industry’s Lowest Quiescent Current: 10µA
■High Efficiency: Up to 95%
■Constant Frequency: 550kHz
■Wide Input Voltage Range: 2.65V to 6V
■VOUT from 0.8V Up to VIN
Efficiency vs Input Voltage
4
2
3
5
1
8
6
7
V
IN
C1
–
C1
+
SHDN/SS
V
OUT
C2
–
C2
+
GND
LTC1503-2
1µF
1503-2 TA01
1µF
10µF
1-CELL Li-Ion OR
3-CELL NiMH 10µF
V
OUT
= 2V
I
OUT
= 100mA
Single Li-Ion to 2V DC/DC Converter
■No Inductors Needed
■Low Power: 25µA Quiescent Current, 5µA in Shutdown
■Shutdown Disconnects Load from VIN
■Available with Fixed 1.8V or 2V Output
■Small MSOP and SO-8 Packages
INPUT VOLTAGE (V)
2
EFFICIENCY (%)
60
80
6
1503-2 TA02
40
20 34
*LOW DROPOUT VOLTAGE LINEAR REGULATOR
5
100
V
OUT
= 2V
I
OUT
= 100mA
LTC1503-2
“IDEAL” LDO*
Choose the Right Step-Down Converter for Your Phone*
Characteristics LTC1433/34 LTC1474/75 LTC1503 LT1612 LTC1701 LTC1771 LTC1877/78
Input Voltage Range 3V to 13.5V 3V to 18V 2.4V to 6V 2V to 5.5V 2.5V to 5.5V 2.7V to 20V 2.65V to 10V (LTC1877)
2.65V to 6V (LTC1878)
Max Output Current 450mA 300mA 100mA 500mA 500mA 5A** 600mA
Quiescent Current 470µA10µA25µA 150µA 135µA10µA10µA
Switching Frequency to 700kHz 50kHz to 200kHz
†
600kHz 800kHz 1MHz 100kHz to 250kHz
†
550kHz
Synchronization Range to 700kHz 400kHz to 700kHz
Peak Efficiency 93% 92.5% >80% >80% 94% 93% 95%
Max Duty Cycle 100% 100% 100% 90% 100% 100% 100%
Other Features Low Noise Programmable No Inductor Synchronous <0.6cm
2
External FET Synchronous
Fixed Freq Current Limit Tiny Size Constant Freq Solution Soft-Start Constant Freq
Packages SSOP-16 MSOP-8 MSOP-8 MSOP-8 SOT-23 MSOP-8 MSOP-8
SSOP-20 SO-8 SO-8 SO-8 SO-8
*Other switching regulator controllers available for higher output current
†
Fixed off-time device
**Select external FET for current range desired
47µF***
7
6
1
2
5
3
4
SW
V
FB
LTC1878
GND
10µH*
10µF**
CER
220pF
V
OUT
2.5V
*
**
***
TOKO D62CB A920CY-100M
TAIYO-YUDEN CERAMIC LMK325BJ106MN
SANYO POSCAP 6TPA47M
887k
20pF
412k
1878 TA01
SYNC
V
IN
RUN
I
TH
V
IN
2.65V
TO 6V
+
OUTPUT CURRENT (mA)
20
EFFICIENCY (%)
40
60
80
100
0.1 10 100 1000
1878 TA02
01
Burst Mode OPERATION
V
IN
= 5V
V
IN
= 3.6V
PULSE SKIP
V
IN
= 5V
V
IN
= 3.6V
L = 10µH
V
OUT
= 2.5V
Operate
from Single
Li-Ion Cell
Up to 40%
Higher Efficiency
Than an LDO
Small MSOP
Package!
>90% Efficiency
from 400µA
to 400mA!
Choose the Right LDO Regulator for Your Application
Characteristics LT1120A LT1121 LT1129 LT1521 LT1761 LT1762 LT1962 LT1763
Max Output Current 125mA 150mA 700mA 300mA 100mA 150mA 300mA 500mA
Supply Current 20µA30µA50µA12µA20µA25µA30µA30µA
Max Input Voltage 36V 30V 30V 20V 20V 20V 20V 20V
Dropout Voltage* 0.4V 0.42V 0.45V 0.5V 0.3V 0.35V 0.35V 0.35V
Packages SO-8 SO-8 SOT-223 MSOP-8 SOT-23 MSOP-8 MSOP-8 SO-8
SO-8 SO-8
SOT-223
*At maximum output current.
4
Cellular Telephones
Power Management and Signal Conditioning
InfoCard 19
Low Dropout Voltage Regulators
LT1761/LT1762/LT1962/LT1763: Ultralow Noise LDO Regulators with Lowest Quiescent Current
■
Low Noise: 20µV
RMS
(10Hz to 100kHz)
■
Micropower: 20µA to 30µA Quiescent
Current, 1µA in Shutdown Mode
■
Low Dropout Voltage: 250mV to 350mV
at Rated Load
■
Stable with Tiny Ceramic Output Caps:
1µF to 10µF
■
Reverse Battery Protection
■
No Protection Diodes Needed
■
Fixed and Adjustable Output Versions
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
LTC1755
PRES
PWR
CS
NC/NO
GND
VIN
VCC
AUX1
AUX2
I/O
RST
CLK
C2
10µF
C3
10µF
VCC
AUX1
AUX2
I/O
RST
CLK
C1
0.68µF
GND
SMART CARD
1755 TA01
SMART CARD
PRESENT SWITCH
µCONTROLLER
3.3V
5V/3V
CARD
ALARM
READY
DVCC
C–
C+
AUX1IN
AUX2IN
DATA
RIN
CIN
SIM and Smart Card Interface
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CIN
RIN
DATA
DDRV
DV
CC
SS
M1
M0
CLK
RST
I/O
V
CC
5V ±5%
I
VCC
≤ 10mA
GND
CLK
RST
I/O
V
CC
V
IN
C1
+
C1
–
GND
0.1µF10µF
LTC1555
3V GSM
CONTROLLER SIM
V
IN
2.7V TO 10V
3V
+
10µF
1555/56 TA01
+
V
CC
IN
0.01µF10µF
1761 TA01
56.2k
OUT
V
IN
2V TO
20V BYP
ADJ
GND
LT1761-BYP
243k
1.5V AT100mA
+
1µF
1.5V Low Noise Supply
LT1761 Output Noise
(BW = 10Hz to 100kHz)
20µV
RMS
C
OUT
= 10µF 1ms/DIV
C
NOISE
= 0.01µF
Ultralow
Noise
■
>10kV ESD On All SIM/Smart Card Contact Pins
■
Short-Circuit and Overtemperature Protected
■
3V ↔ 5V Signal Level Translators
■
Soft-Start Limits Inrush Current at Turn-On
LTC1555/LTC1556 Power Supply and
Level Translators for 3V/5V SIM Cards
■
Step-Up/Step-Down Charge Pump Generates 5V
■
Input Voltage Range: 2.7V to 10V
■
Very Low Operating Current: 50µA
■
Very Low Shutdown Current: <1µA
■
650kHz Switching Frequency
■
Auxiliary 4.3V LDO or Power Switch (LTC1556)
■
16- and 20-Pin Narrow SSOP
LTC1755/LTC1756 Smart Card Interface
■
Fully ISO 7816-3 and EMV Compliant
■
Buck-Boost Charge Pump Generates 3V or 5V
■
2.7V to 6V Input Voltage Range
■
Alarm Output Indicates Fault (LT1755)
■
May Be Paralleled for Multiple Cards (LTC1755)
■
Very Low Operating Current: 60µA
■
Very Low Shutdown Current: <2µA
■
16- and 24-Pin Narrow SSOP
10kV ESD
Protected
High Efficiency Boost Converter Selection Guide
Characteristics LT1307 LT1308 LT1316 LT1610 LT1615 LT1615-1 LTC1682 LTC1751* LTC1754*
Input Voltage Range 1V to 12V 1V to 12V 1.65V to 8V 1V to 8V 1.2V to 15V 1V to 15V 1.8V to 4.4V 2.7V to 5.5V 2.7V to 5.5V
Max Switch Current 500mA 2A 500mA 450mA 350mA 100mA 50mA 100mA 50mA
Supply Current 50µA 140µA33µA30µA30µA30µA 110µA20µA13µA
Switching Frequency 600kHz 600kHz 120kHz
†
1.7MHz to 1.4MHz
†
to 1.4MHz
†
550kHz 800kHz 700kHz
Peak Efficiency 80% 91% 87% 77% 84% 84% 82% 82%
Other Features Low-Battery High Power Adj Current Tiny 34V Switch, Single Cell Low Noise Soft-Start, Tiny Size,
Detector from Limit Components Tiny Size Operation 60µV
RMS
Power Good Load
Single Cell Disconnect
Packages MSOP-8 SO-8 MSOP-8 MSOP-8 SOT-23 SOT-23 MSOP-8 MSOP-8 SOT-23
SO-8 SO-8 SO-8 SO-8
*Data is shown for 5V output version; varies slightly for 3.3V output version.
†
Constant off-time, variable on-time operation.
5
■
Adjustable or Fixed Boosted Output:
2.5V to 5.25V
■
Low Output Noise: 60µV
RMS
■
Input Voltage Range: 1.8V to 4.4V
Boost DC/DC Converters
LTC1682: Low Noise Charge Pump with LDO Regulator
■
No Inductors Needed
■
Output Current to 50mA
■
Low Operating Current: 110µA
■
Low Shutdown Current: 1µA
■
Low ESR, Low Value Ceramic Caps
■
Doubler Charge Pump with Low Dropout Linear
Regulator Output
■
8-Lead MSOP and SO Packages
4.7µF
0.22µFC
FILT
1nF
V
IN
2.5V TO
4.4V
4.7µF
1
2SHUTDOWN
3
4
8
7
6
5
V
OUT
SHDN
FILT
GND
CPO
C
+
V
IN
C
–
1682 TA01
C2
4.7µF
5V
LOW NOISE
LTC1682-5
VCO
5V VCO Power Supply, VIN = 2.5V to 4.4V
LTC1682-5 Output Noise
60µV
RMS
(100kHz BW)
1682 G06
Low Noise
Charge Pump
in MSOP!
Cellular Telephones
Power Management and Signal Conditioning
InfoCard 19
100µs/DIV
Cellular Telephones
Power Management and Signal Conditioning
InfoCard 19
Linear Technology Corporation • 1630 McCarthy Blvd. • Milpitas, CA 95035-7417 • (408) 432-1900 • www.linear-tech.com • Literature Only: 1-800-4-LINEAR
ic19b ©1997 LT/TP 0300 4K
DC/DC Conversion for LCD Bias
■
Contrast Control for LCD Displays
■
Boosted Positive or Negative Voltage Regulator with Small
Size, Very Low Component Height and Long Battery Life
■
Peak Current Controlled to Keep the Inductor from
Saturating and to Limit Output Ripple
Inverting Converters for LCD Bias
Characteristics LT1615 LT1615-1 LT1617 LT1617-1
Input Voltage Range 1.2V to 15V 1V to 15V 1.2V to 15V 1V to 15V
Output Voltage Range to 34V to 34V to –34V to –34V
Max Switch Current 350mA 100mA 350mA 100mA
Supply Current 30µA30µA30µA30µA
Switching Frequency to 1.4MHz* to 1.4MHz* to 1.4MHz* to 1.4MHz*
Peak Efficiency 84% 84% 84% 84%
Other Features 34V Switch Single Cell Tiny Size Single Cell
Tiny Size Operation
Package SOT-23 SOT-23 SOT-23 SOT-23
*Constant off-time, variable on-time operation.
Single Cell Li-Ion to 20V Converter for LCD Bias
Color LCD Backlight Supply (White LEDs)
■
LTC1754/LTC1751 Are Perfect for 3V to 5V Conversion to
Drive White LED Backlights for Color LCD Displays
■
LTC1754 is Smallest 50mA Solution
■
LTC1751 Adds Power Good and Undervoltage Outputs,
Plus 100mA Output
■
LTC1751 Includes Soft-Start to Improve PWM Dimming
■
LTC1682 for Lowest Noise: Includes LDO Post Regulator
C+
VIN
LTC1754-5
LTC1754-5
C–
ON OFF
VOUT
GND
SHDN
1
2
46
5
3100Ω
VIN
2.7V
TO 5.5V 10µF
50mA, UP TO FOUR WHITE LEDs
10µF
1µF
100Ω
• • •
100Ω
For White
LED
Backlights!
■
Low Output Ripple: Less Than 1mV
P-P
■
High Charge Pump Frequency: 900kHz
■
Small Charge Pump Capacitors: 0.1µF
■
Fixed –4.1V, –2.5V, –2V or Adjustable Output
■
Shutdown Mode Drops Supply Current to 0.2µA
■
High Output Current: Up to 20mA
■
Output Regulation: 2.5%
■
MSOP and SO-8 Packages
GaAs FET Bias Generator Family
Characteristics LTC1261L LTC1429 LTC1550L/LTC1551L
Min Input Voltage 2.7V 3V 2.7V
Quiescent Current 650µA 600µA 3.65mA
Oscillator Frequency 650kHz to 2MHz 900kHz
Other Features Converts –3.5V, –4V, –4.5V <1mV Output
3V to –4V –5V Outputs Ripple
Packages SO-8 SO-8, SO-14 SSOP-16
MSOP-8, SO-8
GaAs FET Bias
LTC1550L/LTC1551L: Low Noise Charge Pump Negative Bias Generators
<1mV Output
Ripple