LP2954 Datasheet, PDF (6/28 Pages) National Semiconductor (TI) – 5V and Adjustable Micropower Low-Dropout Voltage Regulators

LP2954, LP2954A
SNVS096E – JUNE 1999 – REVISED JULY 2016
www.ti.com
Electrical Characteristics (continued)
Limits are specified by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods.
Unless otherwise noted: T_J = 25°C, V_IN = 6 V, I_L = 1 mA, C_L = 2.2 μF
PARAMETER
TEST CONDITIONS
LP2954AI
MIN TYP MAX
LP2954I
UNIT
MIN TYP MAX
I_LIMIT
ΔV_O/ΔP_D
Current limit
Thermal regulation
V_O = 0 V
V_O = 0 V
–40°C ≤ T_J ≤ 125°C
See ⁽⁶⁾
380
500
530
0.05
0.2
I_L = 100 mA, C_L = 2.2 µF
400
e_n
Output noise
10 Hz to 100 kHz
I_L = 100 mA, C_L = 33 µF
260
I_L = 100 mA, C_L = 33 µF⁽⁷⁾
80
ADDITIONAL SPECIFICATIONS FOR THE ADJUSTABLE DEVICE (LP2954AIM and LP2954IM)
See ⁽⁸⁾
1.215 1.23 1.245
V_REF
Reference voltage
See ⁽⁸⁾
–40°C ≤ T_J ≤ 125°C
1.205
1.255
ΔV_REF/
V_REF
ΔV_REF/ΔT
Reference voltage line
regulation
Reference voltage
temperature coefficient
V_IN= 2.5 V to V_O(NOM) + 1 V
V_IN= 2.5 V to V_O(NOM) +1 V to
30 V⁽⁹⁾⁽⁸⁾–40°C ≤ T_J ≤ 125°C
See ⁽²⁾
–40°C ≤ T_J ≤ 125°C
0.03%
0.1%
0.2%
20
I_B(FB)
Feedback pin bias current
–40°C ≤ T_J ≤ 125°C
20
40
60
I_GND
Ground pin current at
shutdown ⁽⁵⁾
V_SHUTDOWN ≤ 1.1 V
105
140
See ⁽¹⁰⁾
30
I_O(SINK)
Output OFF pulldown
current
See ⁽¹⁰⁾
20
–40°C ≤ T_J ≤ 125°C
DROPOUT DETECTION COMPARATOR
380
0.05
400
260
80
1.205 1.23
1.19
0.03%
20
105
30
20
500
mA
530
0.2 %/W
μV_RMS
1.255
1.27 ^V
0.2%
0.4%
ppm/°C
40
nA
60
140 μA
mA
I_OH
Output HIGH leakage
current
V_OH = 30 V
V_OH = 30 V, –40°C ≤ T_J ≤
125°C
0.01
1
2
0.01
1
µA
2
V_OL
Output LOW voltage
V_THR(MAX) Upper threshold voltage
V_THR(MIN)
Lower threshold voltage
HYST
Hysteresis
V_IN = V_O(NOM) − 0.5 V
I_O(COMP) = 400 μA
–40°C ≤ T_J ≤ 125°C
See ⁽¹¹⁾
See ⁽¹¹⁾
–40°C ≤ T_J ≤ 125°C
See ⁽¹¹⁾
See ⁽¹¹⁾
–40°C ≤ T_J ≤ 125°C
See ⁽¹¹⁾
150
–80 –60
–95
–110 –85
–160
15
250
150
400
–35
–80 –60
–25
–95
–55 –110 –85
–40 –160
15
250
mV
400
–35
mV
–25
–55
mV
–40
mV
(6) 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 200-mA load pulse at V_IN = 20 V (3-W pulse) for T = 10 ms.
(7) Connect a 0.1-μF capacitor from the OUT pin to the FEEDBACK pin.
(8) V_REF ≤ V_OUT ≤ (V_IN − 1 V), 2.3 V ≤ V_IN ≤ 30 V, 100 μA ≤ I_L≤ 250 mA.
(9) Two separate tests are performed, one covering V_IN = 2.5 V to V_O(NOM) + 1 V and the other test for V_IN = 2.5 V to V_O(NOM) + 1 V to 30 V.
(10) V_SHUTDOWN ≤ 1.1 V, V_OUT = V_O(NOM).
(11) Comparator thresholds are expressed in terms of a voltage differential at the FEEDBACK pin below the nominal reference voltage
measured at V_IN = V_O(NOM) + 1 V. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain,
which is V_OUT/V_REF = (R1 + R2 ) / R2.
6
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