AiT Semiconductor Inc.
www.ait-ic.com
A7115
DC-DC CONVERTER
1.5MHZ, 1.5A SYNCHRONOUS STEP-DOWN CONVERTER
REV1.0 - APR 2013 RELEASED, NOV 2014 UPDATED - - 1 -
DESCRIPTION
FEATURES
The A7115 is a high efficiency monolithic
synchronous buck regulator using a constant
frequency, current mode architecture. Supply
current with no load is 300uA and drops to <1uA in
shutdown. The 2.5V to 6.5V input voltage range
makes the A7115 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 eliminates the need
for an external Schottky diode. Low output voltages
are easily supported with the 0.6V feedback
reference voltage.
The A7115 is available in SOT-25 package.
ORDERING INFORMATION
Package Type
Part Number
SOT-25 E5
A7115E5R
A7115E5VR
Note
V: Halogen free Package
R: Tape & Reel
AiT provides all RoHS products
Suffix “ V “ means Halogen free Package
High Efficiency: Up to 96%
1.5MHz Constant Switching Frequency
1.5A Output Current at V
IN
=3V
Integrated Main switch and synchronous
rectifier. No Schottky Diode Required
2.5V to 6.5V Input Voltage Range
Output Voltage as Low as 0.6V
100% Duty Cycle in Dropout
Quiescent Current: 300μA(input < 4.2V)
Slope Compensated Current Mode Control for
Excellent Line and Load Transient Response
Short Circuit Protection
<1uA Shutdown Current
Soft start
Available in SOT-25 Package
APPLICATION
Cellular and Smart Phones
Microprocessors and DSP Core Supplies
Wireless and DSL Modems
PDAs
MP3 / MP4 /PMP Player
Digital Still and Video Cameras
Portable Instruments
TYPICAL APPLICATION
AiT Semiconductor Inc.
www.ait-ic.com
A7115
DC-DC CONVERTER
1.5MHZ, 1.5A SYNCHRONOUS STEP-DOWN CONVERTER
REV1.0 - APR 2013 RELEASED, NOV 2014 UPDATED - - 2 -
PIN DESCRIPTION
Top View
Pin #
Function
1 RUN
Regulator Enable control input. Drive RUN above 1.5V to turn on the part. Drive
RUN below 0.6V to turn it off. In shutdown, all functions are disabled drawing
<1μA supply current. Do not leave RUN floating.
2 GND
Ground.
3 SW
Power Switch Output. It is the Switch note connection to Inductor. This pin
connects to the drains of the internal P-CH and N-CH MOSFET switches.
4 V
IN
Supply Input Pin. Must be closely decoupled to GND, Pin 2, with a 22μF or
greater ceramic capacitor.
5 FB
Feedback Input Pin. Connect FB to the center point of the external resistor
divider. The feedback threshold voltage is 0.6V.