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AS1341

ams
Part Number AS1341
Manufacturer ams
Description Ultra low Ripple Step Down DC/DC Converter
Published Feb 18, 2015
Detailed Description AS1341 650mA, Ultra low Ripple Step Down DC/DC Converter 1 General Description The AS1341 is a high-efficiency step-dow...
Datasheet PDF File AS1341 PDF File

AS1341
AS1341

Overview
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 lightload 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.
VIN 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 1 - 18 AS1341 Datasheet - Pin Assignments 4 Pin Assignments Figure 2.
Pin Assignments (Top View) FB 1 GND 2 POK 3 LX 4 8 OUT AS1341 9 7 SHDNN 6 ILIMIT 5 IN 4.
1 Pin Descriptions Table 1.
Pin Descriptions Pin Number Pin Name 1 FB 2 GND 3 POK 4 LX 5 IN 6 ILIMIT 7 SHDNN 8 OUT 9 NC Description Feedback Input.
For the fixed 5V output connect this pin to GND.
For adjustable output, connect to a resistive divider between VOUT and GND to set the output voltage ...


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