LP2950 Datasheet, PDF (6/31 Pages) National Semiconductor (TI) – Series of Adjustable Micropower Voltage Regulators

LP2950
LP2951
SLVS582H – APRIL 2006 – REVISED MARCH 2012
ELECTRICAL CHARACTERISTICS (continued)
V_IN = V_OUT (nominal) + 1 V, I_L = 100 μA, C_L = 1 μF (5-V versions) or C_L = 2.2 μF (3-V and 3.3-V versions),
8-pin version: FEEDBACK tied to V_TAP, OUTPUT tied to SENSE, V_SHUTDOWN ≤ 0.7 V
PARAMETER
TEST CONDITIONS
T_J
MIN TYP
(LP2951-xx) 8-PIN VERSION ONLY ADJ
25°C
1.218 1.235
Reference voltage
Reference voltage
temperature coefficient⁽⁵⁾
V_OUT = V_REF to (V_IN – 1 V),
V_IN = 2.3 V to 30 V,
I_L = 100 μA to 100 mA
–40°C to 125°C 1.212
–40°C to 125°C 1.200
25°C
20
FEEDBACK bias current
25°C
20
–40°C to 125°C
FEEDBACK bias current
temperature coefficient
25°C
0.1
ERROR COMPARATOR
Output leakage current
V_OUT = 30 V
25°C
0.01
–40°C to 125°C
Output low voltage
V_IN = V_OUT(NOM) – 0.5 V,
I_OL = 400 μA
25°C
150
–40°C to 125°C
Upper threshold voltage
(ERROR output high)⁽⁶⁾
25°C
–40°C to 125°C
40
60
25
Lower threshold voltage
(ERROR output low)⁽⁶⁾
Hysteresis ⁽⁶⁾
25°C
75
–40°C to 125°C
25°C
15
SHUTDOWN INPUT
Input logic voltage
Low (regulator ON)
High (regulator OFF)
–40°C to 125°C
2
SHUTDOWN input current
SHUTDOWN = 2.4 V
SHUTDOWN = 30 V
25°C
30
–40°C to 125°C
25°C
450
–40°C to 125°C
Regulator output current
in shutdown
V_SHUTDOWN ≥ 2 V,
V_IN ≤ 30 V, V_OUT = 0,
FEEDBACK tied to V_TAP
25°C
–40°C to 125°C
3
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MAX UNIT
1.252
1.257
V
1.272
ppm/°C
40
nA
60
nA/°C
1
μA
2
250
mV
400
mV
95
mV
140
mV
0.7
V
50
100
μA
600
750
10
μA
20
(5) Output or reference voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range.
(6) Comparator thresholds are expressed in terms of a voltage differential equal to the nominal reference voltage (measured at
V_IN – V_OUT = 1 V) minus FEEDBACK terminal voltage. To express these thresholds in terms of output voltage change, multiply by the
error amplifier gain = V_OUT/V_REF = (R1 + R2)/R2. For example, at a programmed output voltage of 5 V, the ERROR output is specified to
go low when the output drops by 95 mV × 5 V/1.235 V = 384 mV. Thresholds remain constant as a percentage of V_OUT (as V_OUT is
varied), with the low-output warning occurring at 6% below nominal (typ) and 7.7% (max).
6
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