AS1341_13 Datasheet, PDF (1/18 Pages) ams AG – 650mA, Ul t ra low Ripple Step Down DC/DC Conver ter

AS1341
650mA, Ultra low Ripple Step Down DC/DC Converter
1 General Description
The AS1341 is a high-efficiency step-down converter with adjustable
output voltages from 1.25V to VIN using supply voltages of up to
20V.
An integrated current-limited 0.4Ω MOSFET delivers load currents
up to 600mA.
The AS1341 also includes a 100% duty cycle LDO mode with a low
dropout of only 250mV for high efficiency if input voltages is in the
range of the output voltage.
The AS1341 has a low quiescent current (12µA) to improve light-
load efficiency and minimize battery use, and draws only 0.8µA in
shutdown mode.
High switching frequencies (up to 200kHz) allow the use of small
surface-mount inductors and output capacitors.
The device is available in a TDFN-8 3x3mm pin package.
Figure 1. AS1341 - Typical Application
2 Key Features
Output Voltages: Fixed 5V or Adjustable
Input Voltage Range: 4.5V to 20V
Output Current: Up to 600mA
1.25V Lowest Output Voltage
Efficiency: up to 96%
Quiescent Supply Current: 12µA
Power-OK Output
Internal 0.4Ω P-Channel MOSFET
Shutdown Current: 0.8µA
100% Maximum Duty Cycle for Low Dropout
Current-Limited Architecture
Thermal Shutdown
TDFN-8 3x3mm Package
3 Applications
The device is ideal for notebook computers, distributed power
systems, keep-alive supplies, and any other battery-operated,
portable device.
V_IN
4.5V to 20V
CIN
5
IN
7
SHDNN
6
ILIMIT
2
GND
AS1341
4
LX
D1
8
OUT
3
POK
1
FB
L1
VOUT = 5V
+
COUT
RPULL
Indicates High-Power Trace
www.ams.com/DC-DC_Step-Up/AS1341
Revision 1.09
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