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A7111

AiT Semiconductor

1A SYNCHRONOUS PSM/PWM BUCK (STEP-DOWN) DC-DC CONVERTER

AiT Semiconductor Inc. www.ait-ic.com A7111 1.5 MHZ, 1A SYNCHRONOUS PSM/PWM BUCK (STEP-DOWN) DC-DC CONVERTER DESCRIPTI...


A7111

AiT Semiconductor


Octopart Stock #: O-919565

Findchips Stock #: 919565-F

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Description
AiT Semiconductor Inc. www.ait-ic.com A7111 1.5 MHZ, 1A SYNCHRONOUS PSM/PWM BUCK (STEP-DOWN) DC-DC CONVERTER DESCRIPTION FEATURES The A7111 is a constant frequency, 1.5MHz, slope compensated current mode PWM stepdown converter working under an input voltage range of 2.5V to 5.5V. This feature makes the A7111 suitable for single cell Liion batte
More View ry-powered applications. The internal synchronous rectifier is desired to increase efficiency without an external Schottky diode. 100% duty cycle capability extends battery life in portable devices, while the quiescent current is 200μA at no load, and drops to < 1μA in shutdown. Pulse Skipping Mode operation increases efficiency at light loads, further extending battery life. The A7111 is offered in a low profile (1mm) 5-pin, thin SOT-23 package, and is available in an adjustable version and fixed output versions of 1.0V, 1.2V, 1.5V , 1.8V, 2.5V and 3.3V.  High Efficiency: Up to 96%  1.5MHz Constant Switching Frequency  Current Mode Operation for Excellent Line and Load Transient Response  No Schottky Diode Required  2.5V to 5.5V Input Voltage Range  1.0V,1.2V,1.5V,1.8V,2.5V and 3.3V Fixed/Adjustable Output Voltage  100% Duty Cycle in Dropout Mode  Low Quiescent Current: 200μA  Over temperature Protection  Short Circuit Protection  Shutdown Quiescent Current < 1μA  Available in SOT-25 and DFN6(2x2) package APPLICATION The A7111 is available in SOT-25 and DFN6(2x2) Package. ORDER INFORMATION Package Type Part Number SOT-25 E5 A7111E5R-XX A7111E5VR-XX DFN6 (2x2) J6 A7111J6R-XX A7111J6VR-XX XX: Output Voltage Note 33=3.3V,ADJ=Adjustable R: Tape & Reel V: Halogen free Package AiT provides all RoHS products Suffix “V” means Halogen free Package  Cellular and Smart Phones  Wireless Handsets and DSL Modems  Microprocessors and DSP Core Supplies  PDAs  Digital Still and Video Cameras  MP3/MP4/MP5 Players  Portable Instruments  GPS Receivers TYPICAL APPLICATION CIRCUIT REV1.1 - MAY 2011 RELEASED, FEB 2013 REVISED - Figure 1. A7111-ADJ Typical Application Circuit -1- AiT Semiconductor Inc. www.ait-ic.com PIN DESCRIPTION A7111 1.5 MHZ, 1A SYNCHRONOUS PSM/PWM BUCK (STEP-DOWN) DC-DC CONVERTER Top View Pin # SOT-23 DFN6 12 2 1,5 34 43 56 Top View Symbol Function Regulator Enable Control Input. Drive EN above 1.5V to turn on the part. Drive EN below 0.3V to turn it off. In EN shutdown, all functions are disabled drawing <1KA supply current. Do not leave EN floating. GND Ground Power Switch Output. It is the Switch note connection to SW external Inductor. This pin connects to the drains of the internal P-CH and N-CH MOSFET switches. Supply Input Pin. Must be closely decoupled to GND, VIN Pin 2, with a 2.2µF or greater ceramic capacitor. VFB (ADJ): Feedback Input Pin. Connect FB to the center point of the external resist






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