AME8821 Datasheet, PDF (1/15 Pages) Analog Microelectronics – 250mA Hi-PSRR, Low-Quiescent LDO with In-Rush Current Control For USB Application

AME, Inc.
AME8821
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
n General Description
The AME8821 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/TSOT-25 packages are attractive
for “Pocket” and “Hand Held”applications.
These rugged devices have both Thermal Shutdown,
and Current Limitation to prevent device failure under the
“Worst” operating conditions. In application requires a
low noise regulated supply. The AME8821 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 AME8821 also features a logic-enabled sleep mode
to shutdown the regulator, reducing quiescent current to
1µA typical at T_A= 25^oC.
The AME8821 is stable with an output capacitance of
4.7µF or larger.
n Features
l Guaranteed 250mA Output
l 17µA Quiescent Current
l Over-Temperature Shutdown
l Over-Current Limitation
l Noise Reduction SR Capacitor
l Power-Saving Shutdown Mode
l Space-Saving SOT-25/TSOT-25 Packages
l Factory Pre-set Output Voltages
l Enable pin option
l ENB 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
n Function Block Diagram
V_IN
* ENB or EN
10KΩ
V_ref
GND
AMP
Current Limit
/ Thermal
Protection
SR
* AME8821A: ENB, AME8821B: EN
V_OUT
R1
R2
n Typical Application
V_IN
1µF
IN
SR
AME8821A
ENB GND ^OUT
+
4.7µF
0.01µF
V_IN
1µF
IN
SR
AME8821B
EN
GND ^OUT
+
4.7µF
0.01µF
Rev.A.01
1