Data Sheet

LP2951 — Adjustable Micro-Power Voltage Regulator
© 2002 Fairchild Semiconductor Corporation www.fairchildsemi.com
LP2951 Rev. 1.1.1 2
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. Values are at T
A
= 25°C unless otherwise noted.
Electrical Characteristics
FEEDBACK (Pin 7) tied to TAP (Pin 6), V
OUT
(Pin 1) tied to PROGRAM (Pin 2). Values are at T
A
= 25°C, unless other-
wise specified.
Notes:
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
- 1 V), 2.5 V ≤ V
IN
≤ 28 V, 100 μA ≤ I
L
≤ 100 mA, 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
= V
O
/ V
REF
= (R1 + R2) / R2.
5. V
shutdown
≤ 0.6 V, V
OUT
= ON, V
shutdown
≥ 2.0 V, V
OUT
= OFF.
Symbol Parameter Value Unit
V
IN
Input Supply Voltage -0.3 to 30.0 V
P
D
Power Dissipation Internally Limited W
R
θJA
Thermal Resistance Junction-to-Air 127.5 °C/W
T
STG
Storage Temperature Range -65 to 150 °C
T
OPR
Operating Junction Temperature Range -40 to 125 °C
Symbol Parameter Conditions Min. Typ. Max. Unit
V
OUT
Fixed Output Voltage I
L
= 50 mA 4.9 5.0 5.1 V
ALL VOLTAGE OPTIONS
ΔV
/
ΔT
Output Voltage Temperature
Coefficient
(1)
50 ppm/°C
ΔV Line Regulation
(2)
(V
O
+ 1) V ≤ V
IN
≤ 28 V,
I
L
= 50 mA
0.4 %
ΔV Load Regulation
(2)
100 μA ≤ I
L
≤ 100 mA 0.3 %
V
D
Dropout Voltage
I
L
= 100 μA150
mV
I
L
= 100 mA 600
I
G
Ground Current
I
L
= 100 μA140μA
I
L
= 100 mA 7 mA
I
CL
Current Limit V
O
= 0 V 110 165 220 mA
V
REF
Reference Voltage
V
IN
= (V
O
+ 1) V, I
L
= 100 μA 1.235 1.260 1.285
V
(3)
1.225 1.260 1.295
I
FB
Feedback Bias Current 20 nA
ERROR COMPARATOR
V
OL
Output Low Voltage V
IN
= (V
O
- 0.5) V, I
OL
= 400 μA150400mV
V
TH
High Threshold Voltage
(4)
25 60 mV
V
TL
Low Threshold Voltage
(4)
75 140 mV
V
HYS
Hysteresis
(4)
15 mV
SHUTDOWN INPUT
V
SD
Shutdown Threshold Range
(5)
0.6 1.3 2.0 V
I
SD
Shutdown Input Current
V
SD
= 2.4 V 30 100
μA
V
SD
= 28 V 450 750