LP2967
LP2967 Dual Micropower 150 mA Low-Dropout Regulator in micro SMD Package
Literature Number: SNVS058L
LP2967
Dual Micropower 150 mA Low-Dropout Regulator in
micro SMD Package
General Description
The LP2967 is a 150 mA, dual fixed-output voltage regulator
designed to provide ultra low-dropout and low noise in bat-
tery powered applications.
Using an optimized VIP (Vertically Integrated PNP) process,
the LP2967 delivers unequalled performance in all specifi-
cations critical to battery powered designs:
Dropout Voltage: Typically 240 mV at 150 mA load, and
6 mV at 1 mA load for each output.
Ground Pin Current: Typically 1 mA at 150 mA load, and
200 µA at 1 mA load for each output.
Enhanced Stability: The LP2967 is stable with output ca-
pacitor ESR as low as 5 mΩ, which allows the use of ceramic
capacitors on the output.
Sleep Mode: Less than 2 µA quiescent current when SD
pins are pulled low.
Smallest Possible Size: micro SMD package uses absolute
minimum board space.
Precision Output: 1.25% tolerance.
Low Noise: By adding a 100 nF bypass capacitor, output
noise can be reduced to 30 µV (typical).
Multiple voltage options, from 1.8V to 5.0V, are available.
Consult factory for custom voltages.
Features
nUltra low drop-out voltage
nGuaranteed 150mA output current, 300 mA peak
nSmallest possible size (micro SMD package)
nRequires minimum external components
nStable with 2.2 µF tantalum or ceramic capacitor
nOutput voltage accuracy ±1%
n<2 µA quiescent current when shut down
nWide supply voltage range (16V max.)
nLow Z
OUT
: 0.3Ωtypical (10 Hz to 1 MHz)
nOver temperature/over current protection
n−40˚C to +125˚C junction temperature range
nCustom voltages available
Applications
nCellular Phone
nPalmtop/Laptop Computer
nPersonal Digital Assistance (PDA)
nCamcorder, Personal Stereo and Camera
Block Diagram
10114201
June 2005
LP2967 Dual Micropower 150 mA Low-Dropout Regulator in micro SMD Package
© 2005 National Semiconductor Corporation DS101142 www.national.com
Basic Application Circuit
10114202
*SD1 and SD2 must be actively terminated. Tie them to VIN if their functions are not needed.
**Minimum capacitance are shown to ensure stability (may be increased without limit).
*** Reduces output noise (may be omitted if application is not noise critical). Use ceramic or film type with very low leakage current.
Ordering Information
Output Voltage (V) Grade Order Information Package
Marking Supplied As
V
OUT1
V
OUT2
For MSOP Package
2.5 2.8 STD LP2967IMM-2528 LCAB 1000 Units Tape and Reel
2.5 2.8 STD LP2967IMMX-2528 LCAB 3000 Units Tape and Reel
2.5 3.3 STD LP2967IMM-2533 LCBB 1000 Units Tape and Reel
2.5 3.3 STD LP2967IMMX-2533 LCBB 3000 Units Tape and Reel
2.6 2.6 STD LP2967IMM-2626 LCLB 1000 Units Tape and Reel
2.6 2.6 STD LP2967IMMX-2626 LCLB 3000 Units Tape and Reel
2.8 2.8 STD LP2967IMM-2828 LAQB 1000 Units Tape and Reel
2.8 2.8 STD LP2967IMMX-2828 LAQB 3000 Units Tape and Reel
2.8 3.3 STD LP2967IMM-2833 LCCB 1000 Units Tape and Reel
2.8 3.3 STD LP2967IMMX-2833 LCCB 3000 Units Tape and Reel
For 8-Bump micro SMD Package (BPA08)
1.8 2.5 STD LP2967IBP-1825 L0P 1000 Units Tape and Reel
1.8 2.5 STD LP2967IBPX-1825 L0P 3500 Units Tape and Reel
1.8 3.3 STD LP2967IBP-1833 L0R 1000 Units Tape and Reel
1.8 3.3 STD LP2967IBPX-1833 L0R 3500 Units Tape and Reel
2.5 2.8 STD LP2967IBP-2528 CA 1000 Units Tape and Reel
2.5 2.8 STD LP2967IBPX-2528 CA 3500 Units Tape and Reel
2.5 3.3 STD LP2967IBP-2533 CB 1000 Units Tape and Reel
2.5 3.3 STD LP2967IBPX-2533 CB 3500 Units Tape and Reel
2.6 2.6 STD LP2967IBP-2626 CL 1000 Units Tape and Reel
2.6 2.6 STD LP2967IBPX-2626 CL 3500 Units Tape and Reel
2.8 2.8 STD LP2967IBP-2828 AQ 1000 Units Tape and Reel
2.8 2.8 STD LP2967IBPX-2828 AQ 3500 Units Tape and Reel
LP2967
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Ordering Information (Continued)
Output Voltage (V) Grade Order Information Package
Marking Supplied As
V
OUT1
V
OUT2
2.8 3.3 STD LP2967IBP-2833 CC 1000 Units Tape and Reel
2.8 3.3 STD LP2967IBPX-2833 CC 3500 Units Tape and Reel
For 8-Bump micro SMD Package (TPA08)
1.8 2.5 STD LP2967ITP-1825 L07 1000 Units Tape and Reel
1.8 2.5 STD LP2967ITPX-1825 L07 3500 Units Tape and Reel
10114205
10114206
LP2967
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Package Outline and Connection Diagram
10114203
Top View
micro SMD
8-Bump micro SMD Package
Code: BP, TP
10114204
Top View
Mini SO-8 Package
8-Lead Small Outline Integrated Circuit (SOIC) Package
Code: MM
Pin Description
Name Pin Number Function
micro SMD MSOP
V
OUT
2 A1 7 Output voltage of the second LDO
SD2 B1 6 Shutdown input for the second LDO
BYPASS C1 5 Bypass capacitor for the bandgap
GND C2 - Ground Substrate
GND C3 4 Common Ground
SD1 B3 3 Shutdown input for the first LDO
V
OUT
1 A3 2 Output voltage of the first LDO
V
IN
A2 1, 8 Common input voltage for both LDOs
LP2967
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range −65˚C to +150˚C
Lead Temp. ( IR reflow, 10 sec.) 245˚C
Pad Temp. (IR reflow, 10 sec.) 245˚C
Operating Junction Temp. Range −40˚C to +125˚C
Power Dissipation (Note 4) Internally Limited
ESD Rating (Note 2) 1.5kV
Input Supply Voltage (Survival) −0.3V to +16V
Input Supply Voltage (Operating) 2.1V to +16V
Shutdown Input Voltage (Survival) −0.3V to +16V
Output Voltage (Survival) (Note 4)
I
OUT
(Survival) Short Circuit Protected
Input-Output Voltage (Survival),
(Note 5)
−0.3V to + 16V
Electrical Characteristics
Limits in standard typeface are for T
j
= 25˚C, and limits in boldface type apply over the full operating junction temperature
range. Unless otherwise specified, V
IN
=V
O(NOM)
+ 1V, I
L
= 1mA, C
IN
= 1µF,C
OUT
= 4.7µF, V
ON/OFF
= 1.6V.
Symbol Parameter Conditions Min Typ Max Units
Operating Specifications
V
O
Output Voltage
Tolerance
I
LOAD
= 1mA
1mA <I
LOAD
<150 mA
−1.25
−3.0
1.25
3.0
%
∆V
O
/∆V
IN
Line Regulation V
O
(NOM) + 1V <V
IN
<16V 0.08 %/V
∆V
O
/∆I
LOAD
Load Regulation V
IN
=V
O(NOM)
+ 1V (Note 6)
1mA <I
LOAD
<150 mA
−5 mV/V
(V
IN
-V
O
) Min. Dropout Voltage
(Note 7)
I
LOAD
= 1mA 6 10
15
mV
I
LOAD
= 50mA 100 125
180
I
LOAD
= 150mA 240 290
425
Operating Currents
I
Q
Quiescent Current
Both Regulators ON
I
LOAD
(1 and 2) = 1mA 200 300
µA
I
LOAD
(1 and 2) = 150mA 1700 5000
One Regulator OFF
I
LOAD
(1 and 2) = 1mA 180 250
I
LOAD
(1 and 2) = 150mA 1000 2500
Both Regulators OFF
(Shutdown) 2
I
PEAK
Peak Output
Current
V
O
<V
OUT
(NOM) − 5% 200 450 mA
Control Inputs (SD1, SD2)
V
IN
(H) Regulator ON
Control Input
Voltage
1.6 1.4 V
V
IN
(L) Regulator OFF
Control Input
Voltage
V
O
<V
OUT
(NOM) − 5% 0.8 0.3 V
I
ON/OFF
Control Input
Current
V
(SD)
=0V
V
(SD)
=5V
−2
7
µA
Dynamic Characteristics
e
n
Output Noise
Voltage
C
BYPASS
= 100nF, 300 to
100kHz
30 µV rms
LP2967
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Electrical Characteristics (Continued)
Limits in standard typeface are for T
j
= 25˚C, and limits in boldface type apply over the full operating junction temperature
range. Unless otherwise specified, V
IN
=V
O(NOM)
+ 1V, I
L
= 1mA, C
IN
= 1µF,C
OUT
= 4.7µF, V
ON/OFF
= 1.6V.
Symbol Parameter Conditions Min Typ Max Units
RR Ripple Rejection
C
BYPASS
= 100nF, V
IN
=
V
O(NOM)
+ 1V + 100mV p-p
square wave (trise and tfall =
100ns)
−52
−54
−56
−58
−50
−47
−70
dB
F = 120Hz
F = 800Hz
F = 1000Hz
F = 1600Hz
F = 10kHz
F = 100kHz
F = 1MHz
Xtalk Crosstalk
Rejection
∆I
LOAD
1 = 150 mA at 1kHz rate
(15 mA/µs rise and fall slope)
dB
I
LOAD
2 = 1mA
∆V
OUT
2/ ∆V
OUT
1 −100
∆I
LOAD
2 = 150 mA at 1KHz rate
(15 mA/µs rise and fall slope)
−100
I
LOAD
1 = 1mA
∆V
OUT
2/ ∆V
OUT
1
Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
beyond its rated operating conditions.
Note 2: Rating is for the human body mode, a 100pF capacitor discharged through a 1.5kΩresistor into each pin.
Note 3: The maximum allowable power dissipation is calculated by using PDMAX =(T
JMAX -T
A/θJA, where TJMAX is the maximum junction temperature, TAis the
ambient temperature, and θJA is the junction-to-ambient thermal resistance of the specified package. Therefore, the maximum power dissipation must be derated
at elevated temperatures and is limited by TJMAX,θJA and A.
Note 4: If used in a dual-supply system where the regulator load is returned to a negative supply, the LP2967 output must be diode-clamped to ground.
Note 5: The output PNP structure contains a diode between the VIN and VOUT terminals that is normally reverse-biased. Reversing the polarity from VIN and VOUT
will turn on this diode.
Note 6: Load regulation excursion over temperature is included in Output Voltage Tolerance.
Note 7: The dropout voltage of a regulator is defined as the minimum input-to-output differential required to stay within 100mV of the output voltage measured with
a 1V differential.
LP2967
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Typical Performance Characteristics Unless otherwise specified: C
IN
= 1µF, C
OUT
= 4.7µF, V
ON/OFF
= 1.6V, I
L
= 1mA, T
A
= 25˚C.
Output Voltage vs Temperature Output Voltage vs Temperature
10114255 10114256
Output Voltage vs Temperature Dropout Voltage vs Load
10114257 10114216
Dropout Voltage vs Temp. and Load Ground Pin Current vs Temp. and Load
10114217 10114218
LP2967
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Typical Performance Characteristics Unless otherwise specified: C
IN
= 1µF, C
OUT
= 4.7µF, V
ON/OFF
= 1.6V, I
L
= 1mA, T
A
= 25˚C. (Continued)
Cross Channel Isolation
I
OUT
1=I
OUT
2=1mA
Cross Channel Isolation
I
OUT
1=I
OUT
2 = 150 mA
10114212 10114211
Input Current vs V
IN
Input Current vs V
IN
(V
OUT
= 3.3V)
10114213 10114214
Input Current vs V
IN
(V
OUT
= 2.5V) Shutdown Current vs Shutdown Voltage
10114215 10114220
LP2967
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Typical Performance Characteristics Unless otherwise specified: C
IN
= 1µF, C
OUT
= 4.7µF, V
ON/OFF
= 1.6V, I
L
= 1mA, T
A
= 25˚C. (Continued)
Short Circuit Current vs V
OUT
Short Circuit Current vs Time
10114258
10114259
Short Circuit Current Line Transient Reponse
10114260 10114222
Line Transient Reponse Line Transient Reponse
10114223 10114224
LP2967
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Typical Performance Characteristics Unless otherwise specified: C
IN
= 1µF, C
OUT
= 4.7µF, V
ON/OFF
= 1.6V, I
L
= 1mA, T
A
= 25˚C. (Continued)
Load Transient Reponse (V
OUT
1) Load Transient Reponse (V
OUT
1)
10114231 10114232
Load Transient Reponse (V
OUT
1) Load Transient Reponse (V
OUT
2)
10114233 10114234
Load Transient Reponse (V
OUT
2) Load Transient Reponse (V
OUT
2)
10114235 10114236
LP2967
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Typical Performance Characteristics Unless otherwise specified: C
IN
= 1µF, C
OUT
= 4.7µF, V
ON/OFF
= 1.6V, I
L
= 1mA, T
A
= 25˚C. (Continued)
LP2967-2.5V Turn-On Time (2nd Output OFF) LP2967-2.5V Turn-On Time (2nd Output ON)
10114240 10114241
Output Impedance vs Frequency Ripple Rejection vs Frequency
10114248
10114249
Ripple Rejection vs Frequency Ripple Rejection vs Frequency
10114250 10114251
LP2967
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Typical Performance Characteristics Unless otherwise specified: C
IN
= 1µF, C
OUT
= 4.7µF, V
ON/OFF
= 1.6V, I
L
= 1mA, T
A
= 25˚C. (Continued)
Ripple Rejection vs Frequency Ripple Rejection vs Frequency
10114252 10114253
Ripple Rejection vs Frequency Output Noise Density
10114254 10114262
Output Noise Density
10114261
LP2967
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Application Hints
EXTERNAL CAPACITORS
The LP2967 low dropout regulator requires two external
capacitors, C
IN
and C
OUT
to assure the device’s output
stability. C
BYPASS
may be used to reduce output noise. The
capacitors must be correctly selected with respect to capaci-
tance values for all three capacitors and ESR value for
C
OUT
.
Input Capacitor
An input capacitor with a minimum capacitance value of 1µF
is required between the LP2967 input and ground (the
amount of capacitance may be increased without limit). This
capacitor must be located a distance of not more than 0.5
inches from the input pin and returned to a clean analog
ground. Any good quality ceramic or tantalum may be used
for this capacitor.
Output Capacitor
The output capacitor must meet the requirement for mini-
mum capacitance value of 2.2 µF and also have an appro-
priate ESR (equivalent series resistance) value. The LP2967
is actually designed to work with ceramic or tantalum output
capacitors, utilizing circuitry which allows the regulator to be
stable with an output capacitor whose ESR is as low as 4
mΩ. It may also be possible to use a film capacitor at the
output, but this type is not as attractive for reasons of size
and cost.
Important: The output capacitor must maintain its ESR in
the stable region over the full operating temperature range of
the application to assure stability. The minimum required
amount of output capacitance is 2.2 µF. Output capacitor
size can be increased without limit. It is important to remem-
ber that capacitor tolerance and variation with temperature
must be taken into consideration when selecting an output
capacitor so that the minimum required amount of output
capacitance is provided over the full operating temperature
range.
LP2967-3.3V Region of Stability with 10 µF C
OUT
10114208
LP2967-3.3V Region of Stability with 4.7 µF C
OUT
10114207
LP2967-2.5V Region Of Stability with 10 µF C
OUT
10114209
LP2967-2.5V Region Of Stability with 4.7 µF C
OUT
10114210
LP2967
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Application Hints (Continued)
LP2967-2.5V Region Of Stability with 2.2 µF C
OUT
10114265
No-Load Operation
If a 2.2 µF output capacitor is used, the minimum stable ESR
value rises to about 0.5 Ωat load currents below 1 mA.If
the minimum output load is <1 mA (with C
OUT
= 2.2 µF), a
Tantalum output capacitor should be used (the ESR of a
ceramic will be too low). It should be noted that if a 4.7 µF (or
larger) output capacitor is used, the part is fully stable with
either Tantalum or ceramic from no load to full load output
current.
Bypass Capacitor
Connecting a 10 nF capacitor to the Bypass pin significantly
reduces noise on the regulator output. It should be noted that
the capacitor is connected directly to a high impedance
circuit in the bandgap reference. Because this circuit has
only a few microamperes flowing into it, any significant load-
ing on this node will cause a change in the regulated output
voltage. For this reason, DC leakage current through the
noise bypass capacitor must never exceed 100 nA, and
should be kept as low as possible for best output voltage
accuracy. The types of capacitors best suited for the noise
bypass capacitor are ceramic and film capacitors. High qual-
ity ceramic capacitors with either NPO or COG dielectric
typically have very low leakage. 10 nF polypropylene and
polycarbonate film capacitors are available in small surface
mount packages and typically have extremely low leakage
current.
CAPACITOR CHARACTERISTICS
Ceramic
Ceramic capacitors have the lowest ESR values, which
make them best for eliminating high frequency noise. The
outputs of LP2967 require a minimum of 2.2 µF of capaci-
tance. The ESR of a typical 2.2 µF ceramic capacitor is in the
range of 4 mΩto 20 mΩ, which easily meets the ESR limits
required for stability by the LP2967. One disadvantage of
ceramic capacitors is that their capacitance can vary with
temperature. Most large value ceramic capacitors are manu-
factured with the Z5U or Y5V temperature characteristic,
which results in the capacitance dropping by more than 50%
as the temperature goes from 25˚C to 85˚C. This could
cause problems if a 2.2 µF capacitor were used on the
output since it will drop down to approximately 1 µF at high
ambient temperatures. This could cause the LP2967 to os-
cillate. If Z5U or Y5V capacitors are used on the output, a
minimum capacitance value of 4.7 µF must be used.
A better choice for temperature coefficient in ceramic capaci-
tors is X7R or X5R which hold the capacitance to within
±15% over the full temperature range. Unfortunately, the
larger values of capacitance are not offered by all manufac-
turers in the X7R dielectric.
Tantalum
For the LP2967, tantalum capacitors are less desirable than
ceramic for use as output capacitors because they are typi-
cally more expensive when comparing equivalent capaci-
tance and voltage ratings in the 2.2 µF to 4.7 µF range of
capacitance. Tantalum capacitors have good temperature
stability: a 4.7µF was tested and showed a 10% decline in
capacitance as the temperature was decreased from +125˚C
to −40˚C while the ESR increased by about 2:1 over the
same range of temperatures. This increase in ESR at lower
temperatures can cause oscillations when marginal quality
capacitors are used and the upper limit for ESR value is
exceeded.
Aluminum
The large physical size of aluminum electrolytic capacitors
make them unattractive for use with the LP2967. Their ESR
characteristics are also not well suited to the requirements of
LDO regulators. The ESR of an aluminum electrolytic is
higher than that of a tantalum, and it also varies greatly with
temperature. A typical aluminum electrolytic can exhibit an
ESR increase of 50X when going from 20˚C to −40˚C. Also,
some aluminum electrolytic capacitors can not be used be-
low −25˚C because the electrolyte will freeze.
SHUTDOWN OPERATION
The two LDO regulators in the LP2967 have independent
shutdown pins. A low logic level signal at either of the shut-
down pins SD1 or SD2 will turn off the corresponding regu-
lator output V
OUT
1orV
OUT
2. Pins SD1 and SD2 must be
terminated by tying them to V
IN
for a proper operation when
the shutdown function is not required.
REVERSE CURRENT PATH
The internal power transistor in the LP2967 has an inherent
parasitic diode. During normal operation, the input voltage is
higher than the output voltage and the parasitic diode is
reverse biased. However, if the output is pulled above the
input in an application, then current flows from the output to
the input if the parasitic diode gets forward biased. The
output can be pulled above the input as long as the current
in the parasitic diode is limited to 150mA.
LP2967
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Application Hints (Continued)
MAXIMUM POWER DISSAIPATION CAPABILITY
Each output pin the LP2967 can deliver a current of up to
150mA over the full operating junction temperature range.
However, the maximum output current must be derated at
higher ambient temperature to ensure the junction tempera-
ture does not exceed 125˚C. Under all possible conditions,
the junction temperatures must be within the range specified
under operating conditions. The LP2967 is available in
MSOP-8 package and 8-bump micro SMD. The junction to
ambient temperature coefficient (θ
JA
) for an MSOP-8 pack-
age is 235˚C/W and the 8-bump micro SMD with minimum
copper area is 220˚C/W. The total power dissipation of the
device is given by:
PD=(V
IN
−V
OUT
1) I
OUT
1+(V
IN
−V
OUT
2) I
OUT
2
The maximum power dissipation, PDmax, that the device
can tolerate can be calculated by using the formula:
PDmax = (T
JMAX
−T
A
)/θ
JA
where T
JMAX
is the maximum specified junction temperature
(125˚C), and T
A
is the maximum ambient temperature.
LP2967
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Physical Dimensions inches (millimeters) unless otherwise noted
micro SMD Package
NS Package Number TPA08F5A
The dimensions of X1, X2, and X3 are given below:
X1 = 1.412mm
X2 = 1.946mm
X3 = 0.500mm
LP2967
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
micro SMD Package
NS Package Number BPA08F5B
The dimensions of X1, X2, and X3 are given below:
X1 = 1.412mm
X2 = 1.946mm
X3 = 0.850mm
Mini SO-8 Package Type MM
For Ordering, Refer to Ordering Information Table
NS Package Number MUA08A
LP2967
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Notes
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR
CORPORATION. As used herein:
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which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform when
properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to result
in a significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
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LP2967 Dual Micropower 150 mA Low-Dropout Regulator in micro SMD Package
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