LP2950_08 Datasheet, PDF (6/25 Pages) Texas Instruments – ADJUSTABLE MICROPOWER VOLTAGE REGULATORS WITH SHUTDOWN

LP2950, LP2951
ADJUSTABLE MICROPOWER VOLTAGE REGULATORS
WITH SHUTDOWN
SLVS582D – APRIL 2006 – REVISED MARCH 2007
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
FEEDBACK bias current
TEST CONDITIONS
T_J
25°C
–40°C to 125°C
MIN TYP
20
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
–40°C to 125°C
150
Upper threshold voltage
(ERROR output high)⁽⁵⁾
25°C
–40°C to 125°C
40
60
25
Lower threshold voltage
(ERROR output low)⁽⁵⁾
25°C
75
–40°C to 125°C
Hysteresis ⁽⁶⁾
25°C
15
SHUTDOWN INPUT
Input logic voltage
Low (regulator ON)
High (regulator OFF)
–40°C to 125°C
2
SHUTDOWN input current
V_TAP = 2.4 V
V_TAP = 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
40
60
UNIT
nA
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) 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) 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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