LP2951-50QDRGRQ1 Datasheet, PDF (4/24 Pages) Texas Instruments – ADJUSTABLE MICROPOWER VOLTAGE REGULATORS WITH SHUTDOWN

LP2951-33-Q1
LP2951-50-Q1
SLVSAW6D – JUNE 2011 – REVISED APRIL 2013
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
Thermal regulation⁽⁴⁾
TEST CONDITIONS
I_L = 100 μA
T_A
MIN
25°C
C_L = 1 μF (5 V only)
Output noise (RMS),
10 Hz to 100 kHz
C_L = 200 μF
LP2951-50-Q1: C_L = 3.3 μF,
C_Bypass = 0.01 μF between pins 1 and 7
25°C
Reference voltage
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
1.200
Reference voltage temperature
coefficient ⁽¹⁾
25°C
ERROR COMPARATOR
Output leakage current
V_OUT = 30 V
25°C
–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
Upper threshold voltage
(ERROR output high)⁽⁵⁾
25°C
40
–40°C to 125°C
25
Lower threshold voltage
(ERROR output low)⁽⁵⁾
25°C
–40°C to 125°C
Hysteresis ⁽⁵⁾
25°C
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
–40°C to 125°C
25°C
–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
www.ti.com
TYP
MAX UNIT
0.05
0.2 %/W
430
160
μV
100
1.272
V
20
ppm/°C
0.01
1
μA
2
150
250
mV
400
60
mV
75
95
mV
140
15
mV
0.7
V
30
50
100
μA
450
600
750
3
10
μA
20
(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).
4
Submit Documentation Feedback
Copyright © 2011–2013, Texas Instruments Incorporated
Product Folder Links: LP2951-33-Q1 LP2951-50-Q1