LP2981 Datasheet, PDF (5/17 Pages) National Semiconductor (TI) – Micropower 100 mA Ultra Low-Dropout Regulator

LP2981
www.ti.com ......................................................................................................................................................... SLVS521F – JULY 2004 – REVISED AUGUST 2008
Electrical Characteristics
at specified free-air temperature range, V_IN = V_OUT(NOM) + 1 V, V_ON/OFF = 2 V, C_IN = 1 µF, I_L = 1 mA, C_OUT = 4.7 µF
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
ΔV_OUT
Output voltage
tolerance
I_L = 1 mA
I_L = 1 mA to 100 mA
ΔV_OUT/ΔV_IN
Output voltage
line regulation
V_IN = (V_OUT(NOM) + 1 V) to
16 V
I_L = 0
V_IN – V_OUT
Dropout
voltage ⁽¹⁾
I_L = 1 mA
I_L = 25 mA
I_L = 100 mA
I_L = 0
I_L = 1 mA
I_GND
Ground pin
current
I_L = 25 mA
I_L = 100 mA
V_ON/OFF < 0.3 V (OFF)
V_ON/OFF < 0.15 V (OFF)
V_ON/OFF
ON/OFF input
voltage ⁽²⁾
High = O/P ON
Low = O/P OFF
I_ON/OFF
ON/OFF input
current
V_ON/OFF = 0
V_ON/OFF = 5 V
I_OUT(PK)
V_n
ΔV_OUT/ΔV_IN
I_OUT(MAX)
Peak output
current
Output noise
voltage (RMS)
Ripple rejection
Short-circuit
current
V_OUT ≥ V_OUT(NOM) – 5%
BW = 300 Hz to 50 kHz,
C_OUT = 10 µF
f = 1 kHz, C_OUT = 10 µF
R_L = 0 (steady state)
T_A
25°C
25°C
–40°C to 125°C
25°C
–40°C to 125°C
25°C
–40°C to 125°C
25°C
–40°C to 125°C
25°C
–40°C to 125°C
25°C
–40°C to 125°C
25°C
–40°C to 125°C
25°C
–40°C to 125°C
25°C
–40°C to 125°C
25°C
–40°C to 125°C
25°C
–40°C to 105°C
–40°C to 125°C
25°C
–40°C to 125°C
25°C
–40°C to 125°C
25°C
–40°C to 125°C
25°C
–40°C to 125°C
25°C
25°C
25°C
25°C
LP2981A-xx
MIN TYP MAX
–0.75
0.75
–1
1
–2.5
2.5
0.007 0.014
0.032
1
3
5
7
10
15
70 100
150
200 250
375
65
95
125
80 110
170
200 300
550
600 1000
1700
0.01 0.8
0.05
2
5
1.4
1.6
0.5
0.15
0.01
–1
5
15
LP2981-xx
UNIT
MIN TYP MAX
–1.25
1.25
–2
–3.5
2 %V_NOM
3.5
0.007 0.014
%/V
0.032
1
3
5
7
10
15
mV
70 100
150
200 250
375
65
95
125
80 110
170
200 300
550 µA
600 1000
1700
0.01 0.8
0.05
2
5
1.4
1.6
V
0.5
0.15
0.01
–1
µA
5
15
150 400
400
mA
160
160
µV
63
63
dB
150
150
mA
(1) Dropout voltage is defined as the input-to-output differential at which the output voltage drops 100 mV below the value measured with a
1-V differential. This dropout specification does not apply to the 1.8-V option, as the minimum V_IN = 2.2 V must be observed for proper
biasing of LDO control circuitry.
(2) The ON/OFF input must be actively terminated. Connect to V_IN if this function is not used (see Application Information).
Copyright © 2004–2008, Texas Instruments Incorporated
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