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AX3503

AXElite
Part Number AX3503
Manufacturer AXElite
Description 1A Synchronous Step-Down Converter
Published Aug 25, 2014
Detailed Description AX3503 1.5MHz, 1A Synchronous Step-Down Converter  GENERAL DESCRIPTION AX3503 is a high efficiency monolithic synchrono...
Datasheet PDF File AX3503 PDF File

AX3503
AX3503

Overview
AX3503 1.
5MHz, 1A Synchronous Step-Down Converter  GENERAL DESCRIPTION AX3503 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture.
The device is available in an adjustable version.
Supply current with no load is 35uA and drops to <1uA in shutdown.
The 2.
5V to 6V input voltage range makes AX3503 ideally suited for single Li-Ion, two to four AA battery-powered applications.
100% duty cycle provides low dropout operation, extending battery life in portable systems.
PWM pulse skipping mode operation provides very low output ripple voltage for noise sensitive applications.
Switching frequency is internally set at 1.
5MHz, allowing the use of small surface mount inductors and capacitors.
The internal synchronous switch increases efficiency and decreases need of an external Schottky diode.
Low output voltages are easily supported with the 0.
6V feedback reference voltage.
AX3503 is available in small SOT-23-5L and TDFN-6L (2*2) packages.
 FEATURES 2.
5V to 6V Input Voltage Range High Efficiency: Up to 94% 1.
5MHz Constant Frequency Operation 1A Output Current at VIN=3.
6V and VOUT=1.
8V Quiescent Current: 35uA (input < 4.
2V) No Schottky Diode Required 100% Duty Cycle in Dropout 0.
6V Reference Allows Low Output Voltages Current Mode Operation for Excellent Line and Load Transient Response Current limit, Enable function Short Circuit Protect (SCP) ≤ 1µA Shutdown Current SOT-23-5L and TDFN-6L (2*2) Pb-Free packages 1/13 Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.
2.
3 Dec.
5, 2012 AX3503  BLOCK DIAGRAM  PIN ASSIGNMENT The packages of AX3503 are SOT-23-5L and TDFN-6L (2*2); the pin assignment is given by: FB 5 (Top View) SOT-23-5L 1 VIN 4 FB GND SW 6 5 4 GND 2 3 1 EN 2 3 GND SW NC EN VIN TDFN-6L (2*2) A Type Name EN VIN SW GND FB Description Enable pin H：normal operation L：Shutdown Power Supply Input Pin Switch output pin.
Connect external inductor here.
Minimize t...


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