Datasheet
AS1341
2 0 V, 6 0 0 m A , 1 0 0 % D u t y C y c le , St e p - D o w n C o n v e r t e r
1 General Description
The AS1341 is a high-efficiency step-down converter
with adjustable output voltages from 1.25V to V
IN
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 effi-
ciency if input voltages is in the range of the output volt-
age.
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 pack-
age.
2 Key Features
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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 bat-
tery-operated, portable device.
Figure 1. AS1341 - Typical Application
V
IN
4.5V to 20V
5
IN
4
LX
D1
L1
V
OUT
= 5V
C
IN
7
SHDNN
6
ILIMIT
8
+
C
OUT
AS1341
OUT
R
PULL
3
POK
1
FB
Indicates High-Power Trace
2
GND
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