Datasheet

LP2951-33-Q1
LP2951-50-Q1
SLVSAW6D –JUNE 2011–REVISED APRIL 2013 www.ti.com
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 (3.3-V versions),
8-pin version: FEEDBACK tied to V
TAP
, OUTPUT tied to SENSE, V
SHUTDOWN
≤ 0.7 V
PARAMETER TEST CONDITIONS T
A
MIN TYP MAX UNIT
Thermal regulation
(4)
I
L
= 100 μA 25°C 0.05 0.2 %/W
C
L
= 1 μF (5 V only) 430
Output noise (RMS), C
L
= 200 μF 160
25°C μV
10 Hz to 100 kHz
LP2951-50-Q1: C
L
= 3.3 μF,
100
C
Bypass
= 0.01 μF between pins 1 and 7
V
OUT
= V
REF
to (V
IN
– 1 V),
Reference voltage V
IN
= 2.3 V to 30 V, –40°C to 125°C 1.200 1.272 V
I
L
= 100 μA to 100 mA
Reference voltage temperature
25°C 20 ppm/°C
coefficient
(1)
ERROR COMPARATOR
25°C 0.01 1
Output leakage current V
OUT
= 30 V μA
–40°C to 125°C 2
25°C 150 250
V
IN
= V
OUT(NOM)
– 0.5 V,
Output low voltage mV
I
OL
= 400 μA
–40°C to 125°C 400
25°C 40 60
Upper threshold voltage
mV
(ERROR output high)
(5)
–40°C to 125°C 25
25°C 75 95
Lower threshold voltage
mV
(ERROR output low)
(5)
–40°C to 125°C 140
Hysteresis
(5)
25°C 15 mV
SHUTDOWN INPUT
Low (regulator ON) 0.7
Input logic voltage –40°C to 125°C V
High (regulator OFF) 2
25°C 30 50
V
TAP
= 2.4 V
–40°C to 125°C 100
SHUTDOWN input current μA
25°C 450 600
V
TAP
= 30 V
–40°C to 125°C 750
V
SHUTDOWN
≥ 2 V, 25°C 3 10
Regulator output current
V
IN
≤ 30 V, V
OUT
= 0, μA
in shutdown
–40°C to 125°C 20
FEEDBACK tied to V
TAP
(4) Thermal regulation is defined as the change in output voltage at a time (T) after a change in power dissipation is applied, excluding load
or line regulation effects. Specifications are for a 50-mA load pulse at V
IN
= 30 V, V
OUT
= 5 V (1.25-W pulse) for t = 10 ms.
(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).
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