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기능 Dual Micropower Low-Dropout Voltage Regulators
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5962-9554701QEA 데이터시트, 핀배열, 회로
May 1999
LP2956/LP2956A
Dual Micropower Low-Dropout Voltage Regulators
General Description
The LP2956 is a micropower voltage regulator with very low
quiescent current (170 µA typical at light loads) and very low
dropout voltage (typically 60 mV at 1 mA load current and
470 mV at 250 mA load current on the main output).
The LP2956 retains all the desirable characteristics of the
LP2951, but offers increased output current (main output),
an auxiliary LDO adjustable regulated output (75 mA), and
additional features.
The auxiliary output is always on (regardless of main output
status), so it can be used to power memory circuits.
Quiescent current increases only slightly at dropout, which
prolongs battery life.
The error flag goes low if the main output voltage drops out
of regulation.
An open-collector auxiliary comparator is included, whose in-
verting input is tied to the 1.23V reference.
Reverse battery protection is provided.
The parts are available in DIP and surface mount packages.
Features
n Output voltage adjusts from 1.23V to 29V
n Guaranteed 250 mA current (main output)
n Auxiliary LDO (75 mA) adjustable output
n Auxiliary comparator with open-collector output
n Shutdown pin for main output
n Extremely low quiescent current
n Low dropout voltage
n Extremely tight line and load regulation
n Very low temperature coefficient
n Current and thermal limiting
n Reverse battery protection
Applications
n High-efficiency linear regulator
n Low dropout battery-powered regulator
n µP system regulator with switchable high-current VCC
Block Diagram
LP2956
© 1999 National Semiconductor Corporation DS011339
DS011339-1
www.national.com




5962-9554701QEA pdf, 반도체, 판매, 대치품
Electrical Characteristics (Continued)
Limits in standard typeface are for TJ = 25˚C, and limits in boldface type apply over the full operating temperature range. Lim-
its are guaranteed by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods.
Unless otherwise specified: VIN = 6V, CL = 2.2 µF (Main Output) and 10 µF (Auxiliary Output), Feedback pin is tied to 5V Tap
pin, CIN = 1 µF, VSD = 0V, Main Output pin is tied to Output Sense pin, Auxiliary Output is programmed for 5V. The main
regulator output has a 1 mA load, the auxiliary regulator output has a 100 µA load.
Symbol
Parameter
Conditions
Typical LP2956AI
LP2956I
Units
Min Max Min Max
AUXILIARY OUTPUT
Feedback Voltage
Temperature Coefficient
20
ppm/˚C
IFB Feedback Pin Bias
Current
Line Regulation
Load Regulation
VIN– VO
Dropout Voltage
en Output Noise
(10 Hz–100 KHz)
ILIM Current Limit
Thermal Regulation
10
6V VIN 30V
0.07
IL = 0.1 mA to 1 mA
IL = 1 mA to 75 mA (Note 10)
IL = 1 mA
IL = 50 mA
IL = 75 mA
CL = 10 µF
CL = 33 µF (Note 9)
IL = 10 mA
VOUT = 0V (Note 13)
(Note 8)
0.1
100
400
500
300
100
80
0.2
20 20 nA
30 30
0.3 0.4 %
0.5 0.6
0.3 0.4 %
0.6 1.0
200 200 mV
300 300
600 600 mV
700 700
700 700 mV
850 850
µV RMS
200 200 mA
250 250
0.5 0.5 %/W
DROPOUT DETECTION COMPARATOR
IOH Output “HIGH” Leakage VOH = 30V
VOL Output “LOW” Voltage
VTHR
(max)
Upper Threshold Voltage
VTHR
(min)
Lower Threshold Voltage
HYST
Hysteresis
SHUTDOWN INPUT
IIN Input Current to Disable
Output
VIH Shutdown Input High
Threshold
VIL Shutdown Input Low
Threshold
AUXILIARY COMPARATOR
VT(high) Upper Trip Point
VIN = 4V
IO (COMP) = 400 µA
(Note 11)
(Note 11)
(Note 11)
(Note 12)
I(SD IN) 1 µA
VO 4.5V
(Note 14)
VT(low)
Lower Trip Point
(Note 14)
www.national.com
4
0.01
150
−240
−350
110
−320
−380
−450
−640
1
2
250
400
−150
−100
−230
−160
−320
−380
−450
−640
1
2
250
400
−150
−100
−230
−160
0.03 0.5 0.5
900 900
1200
1200
400 400
200 200
1.236 1.20 1.28 1.20 1.28
1.19 1.29 1.19 1.29
1.230 1.19 1.27 1.19 1.27
1.18 1.28 1.18 1.28
µA
mV
mV
mV
mV
µA
mV
mV
V
V

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5962-9554701QEA 전자부품, 판매, 대치품
Typical Performance Characteristics Unless otherwise specified: VIN = 6V, CL = 2.2 µF (Main
Output) and 10 µF (Auxiliary Output), Feedback is tied to 5V Tap pin, CIN = 1 µF, VSD = 0V, Main Output pin is tied to Output
Sense pin, Auxiliary Output is programmed for 5V. The main regulator output has a 1 mA load, the auxiliary output has a
100 µA load. (Continued)
Current Limit vs Regulator
(Main Regulator)
Enable Transient
(Main Regulator)
Enable Transient
(Main Regulator)
DS011339-27
Load Transient Response
(Main Regulator)
DS011339-28
Load Transient Response
(Main Regulator)
DS011339-29
Line Transient Response
(Main Regulator)
DS011339-30
Line Transient Response
(Main Regulator)
Ripple Rejection
(Main Regulator)
DS011339-31
Ripple Rejection
(Main Regulator)
DS011339-32
DS011339-33
DS011339-34
DS011339-35
7 www.national.com

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5962-9554701QEA

Dual Micropower Low-Dropout Voltage Regulators

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