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LP2951CMX

Part # LP2951CMX
Description LDO REG 1.26V TO 28V 0.1A 8SOP - Tape and Reel
Category IC
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

©2001 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.0
Features
Low Quiescent Current
Low Dropout Voltage
Low Temperature Coefficient
Tight Line and Load Regulation
Guaranteed 100mA Output Current
Internal Short Current & Thermal Limit
Error Signals of Output Dropout (8 pin Versions Only)
External Shut-down ( 8 pin Versions Only)
Description
The LP2951 is an adjustable micro power voltage regulator
suitable for use in battery-powered systems. This regulator
has various functions such as alarm which warns of a low
output voltage, often due to falling batteries on the input, the
external shutdown which enables the regulator to be
switched on and off, current and temperature limiting.
Internal Block Diagram
OUT(1)
PROGRAM
(2)
SHUTDOWN(3)
GROUND(4)
ERROR(5)
TAP(6)
FEE DBAC K( 7)
INPUT(8)
C1
+
++
+
FROM
EXTERNAL
INPUT
+
++
+
1.25V
REFERENCE
-
--
-
+
++
+
+
++
+
OFFSE
T
-
--
-
+
++
+
ERROR
AMPLIFIER
ERROR
COMPARATO
R
TO
EXTERNAL
INPUT
SCP
COMPARATOR
LP2951
Adjustable Micro Power Voltage Regulator
8-SOP
1
LP2951
2
Absolute Maximum Ratings
Parameter Symbol Value Unit
Input Supply Voltage V
IN
-0.3 ~ +30 V
Power Dissipation P
D
Internally Limited W
Thermal Resistance Junction-Air R
θJA
127.5 °C/W
Storage Temperature Range T
STG
-65 ~ +150 °C
Operating Junction Temperature Range T
OPR
-40 ~ +125 °C
LP2951
3
Electrical Characteristics
(Refer to the test circuit, Ta = 25 °C, unless otherwise specified, )
Note :
1. Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total
temperature range.
2. Regulation is measured at constant junction temperature , using pulse testing with a low duty cycle.
3. V
ref
V
out
(V
in
- 1V), 2.5V V
in
28V, 100uA I
L
100mA, T
A
T
AMAX
.
4. Threshold and hysteresis are expressed in terms of voltage differential at the Feedback terminal below the normal
reference . To express these thresholds in terms of output voltage change , multiply by the error amplifier gain
= VO / VREF = (R1 + R2) / R2 .
5. Vshutdown 0.6 V , V
OUT
=ON , Vshutdown 2.0 V, V
OUT
= OFF.
Parameter Symbol Conditions Min. Typ. Max. Unit
ALL VOLTAGE OPTIONS
Output Voltage Temperature Coefficient V
/
T (Note1) - 50 - ppm/°C
Line Regulation (Note2) V
(Vo + 1)VV
IN
28V
I
L
= 50mA
--0.4%
Load Regulation (Note2) V 100uA I
L
100mA - - 0.3 %
Dropout Voltage V
D
I
L
= 100uA - - 150 mV
I
L
= 100mA - - 600 mV
Ground Current I
G
I
L
= 100uA - - 140 uA
I
L
= 100mA - - 7 mA
Current Limit I
CL
V
O
= 0V 110 165 220 mA
8-PIN VERSIONS ONLY
Reference Voltage
V
REF
(Note3)
1.235 1.26 1.285 V
V
REF
1.225 1.26 1.295 V
ERROR COMPARATOR
Output Low Voltage V
OL
V
IN
= (Vo - 0.5)V, I
OL
=400uA - 150 400 mV
High Threshold Voltage V
TH
(Note4) 25 60 - mV
Low Threshold Voltage V
TL
(Note4) - 75 140 mV
Hysteresis V
HYS
(Note4) - 15 - mV
SHUTDOWN INPUT
Shutdown Threshold Range V
SD
(Note5) 0.6 1.3 2.0 V
Shutdown Input Current I
SD
V
SD
= 2.4V - 30 100 uA
V
SD
= 28V - 450 750 uA
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