LD6938_SER All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Objective data sheet Rev. 1 — 11 July 2013 7 of 15
NXP Semiconductors
LD6938 series
Dual low-dropout regulators, low noise, 300 mA
[1] After T
sd
was reached and after the device was disabled, the junction temperature must decrease by T
sd(hys)
to enable the device.
Output current (pin OUT1 and OUT2)
I
O
output current 300 - - mA
I
act(fold)
foldback activation current V
O
= 0.9 V
O(nom)
-750-mA
I
sc
short-circuit current V
O
= 0 V - 100 - mA
I
q
quiescent current (EN1 or EN2) = HIGH;
I
O
= 0 mA at OUT1 and OUT2;
V
I
=V
O(nom)
+1V
-30-A
(EN1 and EN2) = HIGH;
I
O
= 0 mA at OUT1 and OUT2;
V
I
=V
O(nom)
+1V
-5875A
(EN1 or EN2) = HIGH;
1mA I
O
300 mA at OUT1 and
OUT2; V
I
=V
O(nom)
+1V
-400-A
(EN1 and EN2) = LOW - - 1.0 A
Ripple rejection and output noise
PSRR power supply rejection ratio V
I
=V
O(nom)
+1V; I
O
=50mA;
f
ripple
= 1 kHz; C
L(ext)
=1F
-80-dB
V
n(o)(RMS)
RMS output noise voltage bandwidth = 10 Hz to 100 kHz;
C
L(ext)
=1F; V
O
=1.8V
-70-V
Enable input and timing (pin EN1 and EN2)
V
IL
LOW-level input voltage 0 - 0.4 V
V
IH
HIGH-level input voltage 1.1 - 5.5 V
I
en
enable current -H version - 250 - nA
-PL version; V
EN
=1.8V - 12 - A
R
pd
pull-down resistance -PL version 100 150 200 k
t
startup(reg)
regulator start-up time V
I
=5.5V; V
O
=0.95 V
O(nom)
;
I
O
=300mA; C
L(ext)
=1F
- 110 200 s
Automatic discharge function (-PL version)
R
pd
pull-down resistance - 100 -
t
sd(reg)
regulator shutdown time V
I
=5.5V; C
L(ext)
=1F; I
O
=0A;
V
O
=0.1 V
O(nom)
[1]
-300-s
Thermal protection
T
sd
shutdown temperature - 160 - C
T
sd(hys)
shutdown temperature
hysteresis
[1]
-20-K
Table 8. Electrical characteristics …continued
At recommended input voltages and T
amb
=
40
Cto+85
C; voltages are referenced to GND (ground = 0 V);
unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
