Datasheet
LP38691, LP38693
SNVS321K –JANUARY 2005–REVISED APRIL 2013
www.ti.com
ELECTRICAL CHARACTERISTICS
Limits in standard typeface are for T
J
= 25°C, and limits in boldface type apply over the full operating temperature range.
Unless otherwise specified: V
IN
= V
OUT
+ 1V, C
IN
= C
OUT
= 10 µF, I
LOAD
= 10mA. Min/Max limits are specified through testing,
statistical correlation, or design.
Symbol Parameter Conditions Min Typ
(1)
Max Units
-2.0 2.0
V
O
Output Voltage Tolerance %V
OUT
100 µA < I
L
< 0.5A
-4.0 4.0
V
O
+ 1V ≤ V
IN
≤ 10V
ΔV
O
/ΔV
IN
Output Voltage Line Regulation
(2)
V
O
+ 0.5V ≤ V
IN
≤ 10V
0.03 0.1 %/V
I
L
= 25mA
ΔV
O
/ΔI
L
Output Voltage Load Regulation
(3)
1 mA < I
L
< 0.5A
1.8 5 %/A
V
IN
= V
O
+ 1V
(V
O
= 2.5V)
80 145
I
L
= 0.1A
430 725
I
L
= 0.5A
(V
O
= 3.3V)
65 110
V
IN
- V
OUT
Dropout Voltage
(4)
I
L
= 0.1A mV
330 550
I
L
= 0.5A
(V
O
= 5V)
45 100
I
L
= 0.1A
250 450
I
L
= 0.5A
I
Q
Quiescent Current V
IN
≤ 10V, I
L
=100 µA - 0.5A 55 100
V
EN
≤ 0.4V, (LP38693 Only) 0.001 1 µA
I
L
(MIN) Minimum Load Current V
IN
- V
O
≤ 4V 100
I
FB
Foldback Current Limit V
IN
- V
O
> 5V 350
mA
V
IN
- V
O
< 4V 850
PSRR Ripple Rejection V
IN
= V
O
+ 2V(DC), with 1V(p-p) /
55 dB
120Hz Ripple
T
SD
Thermal Shutdown Activation
160
(Junction Temp)
°C
T
SD
(HYST) Thermal Shutdown Hysteresis
10
(Junction Temp)
e
n
Output Noise BW = 10Hz to 10kHz
0.7 µV/√Hz
V
O
= 3.3V
V
O
(LEAK) Output Leakage Current V
O
= V
O
(NOM) + 1V @ 10V
IN
0.5 12 µA
V
EN
Enable Voltage (LP38693 Only) Output = OFF 0.4
Output = ON, V
IN
= 4V 1.8
V
Output = ON, V
IN
= 6V 3.0
Output = ON, V
IN
= 10V 4.0
I
EN
Enable Pin Leakage (LP38693 V
EN
= 0V or 10V, V
IN
= 10V -1 0.001 1
µA
Only)
(1) Typical numbers represent the most likely parametric norm for 25°C operation.
(2) Output voltage line regulation is defined as the change in output voltage from nominal value resulting from a change in input voltage.
(3) Output voltage load regulation is defined as the change in output voltage from nominal value as the load current increases from 1mA to
full load.
(4) Dropout voltage is defined as the minimum input to output differential required to maintain the output within 100mV of nominal value.
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