AME, Inc.
AME8831
n
General Description
The AME8831 family of positive, linear regulators fea-
ture low quiescent current (17µA typ.) with low dropout
voltage, making them ideal for battery applications. The
space-saving SOT-25 package is attractive for
“
Pocket”
and
“
Hand Held” applications.
These rugged devices have both Thermal Shutdown,
and Current limitation to prevent device failure under the
“
Worst” of operating conditions. In applications requires
a low noise regulated supply. The AME8831 family uses
the SR pin to program the output voltage’ s slew rate to
control the in-rush current. This is specifically used in
the USB application where large load capacitance is
present at start-up.
The AME8831 also features a logic-enabled sleep mode
to shutdown the regulator, reducing quiescent current to
1µA typical at T
A
= 25
o
C.
The AME8831 is stable with an output capacitance of
4.7µF or larger.
150mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
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Applications
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Instrumentation
l
Portable Electronics
l
Wireless Devices
l
Cordless Phones
l
PC Peripherals
l
Battery Powered Widgets
l
Electronic Scales
n
Function Block Diagram
V
OUT
V
IN
* EN or EN
10 k
AMP
V
ref
GND
R2
SR
Current Limit
/ Thermal
Protection
R1
* AME8831A: EN, AME8831B: EN
n
Features
l
Guaranteed 150mA Output
l
Dropout Voltage Typically 150 mV at 150 mA
l
17µA Quiescent Current
l
Over-Temperature Shutdown
l
Over-Current Limitation
l
Noise Reduction Bypass Capacitor
l
Power-Saving Shutdown Mode
l
Space-Saving SOT-25 Package
l
Factory Pre-set Output Voltages
l
Enable pin option
l
EN active low enable
l
EN active high enable
l
All AME's Lead Free Products Meet RoHS
Standards
n
Typical Application
V
IN
1µF
V
IN
SR
AME8831A
EN
GND
V
OUT
0.01µF
+
4.7µF
V
IN
V
IN
SR
V
IN
1µF
AME8831B
EN
GND
V
OUT
0.01µF
+
4.7µF
1
AKM [ ASAHI KASEI MICROSYSTEMS ]
