AME8831 Datasheet, PDF (1/13 Pages) Asahi Kasei Microsystems – 150mA Hi-PSRR, Low-Quiescent LDO with In-Rush Current Control For USB Application

AME, Inc.
AME8831
150mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
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^oC.
The AME8831 is stable with an output capacitance of
4.7µF or larger.
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 Applications
l 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_IN
* EN or EN
10 k
V_ref
GND
AMP
V_OUT
Current Limit
/ Thermal
R1
Protection
R2
SR
* AME8831A: EN, AME8831B: EN
n Typical Application
V _IN
1µ F
V_IN
SR
AME8831A
EN
GND ^VOUT
+
4.7µF
0.01µF
1µ F
V_IN
V_IN
V_IN
SR
AME8831B
EN
GND ^VOUT
+
4.7µF
0.01µF
1