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AiT Semiconductor

A7116 Datasheet Preview

A7116 Datasheet

1.5MHz 700mA Synchronous Step-Down Converter

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AiT Semiconductor Inc.
www.ait-ic.com
A7116
1.5MHz, 700mA Synchronous
Step-Down Converter with Low Quiescent Current
DESCRIPTION
The A7116 is a high efficiency monolithic
synchronous buck regulator using a constant
frequency, current mode architecture.
The A7116 is available in an adjustable version and
fixed output voltages, such as 1.2V, 1.8V, etc.
Supply current with no load is 40uA and drops to
<1uA in shutdown. The 2.5V to 6.5V input voltage
range makes the A7116 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. In power
saving mode, 40uA quiescent current is very
suitable for DSP/MCU in standby operation; and in
PWM mode, low output ripple voltage is good
enough for noise sensitive applications. The two
modes can be automatically switched according to
the load current.
FEATURES
High Efficiency: Up to 96%
1.5MHz Constant Switching Frequency
700mA Output Current at VIN=3.6V
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: 40µA(input < 4.2V)
Slope Compensated Current Mode Control for
Excellent Line and Load Transient Response
Short Circuit Protection
<1uA Shutdown Current
Available in SOT25 package
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 SOT
package.
APPLICATION
Wireless and DSL Modems
PDAs
MP3 / MP4 /MPM Player
Digital Still and Video Cameras
Portable Instruments
The A7116 is available in SOT-25 Package.
ORDER INFORMATION
Typical Application Circuit
Package Type
Part Number
SOT-25
Note
E5
A7116E5R-XXY
A7116E5VR-XXY
XX=Output
12=1.2V, 18=1.8V,33=3.3V
ADJ=Adjustable
V: Green Package
R : Tape & Reel
Y: Pin Type A or B
AiT provides all Pb free products
Suffix “ V “ means Green Package
A7116-ADJ
REV1.1
- JAN 2009 RELEASED, JAN 2011 REVISED -
-1-




AiT Semiconductor

A7116 Datasheet Preview

A7116 Datasheet

1.5MHz 700mA Synchronous Step-Down Converter

No Preview Available !

AiT Semiconductor Inc.
www.ait-ic.com
PIN DESCRIPTION
A7116
1.5MHz, 700mA Synchronous
Step-Down Converter with Low Quiescent Current
Pin #
AB
13
22
35
41
54
Top View
Top View
Symbol
Function
Regulator Enable control input. Drive RUN above 1.25V to turn on the part. Drive
RUN RUN below 0.55V to turn it off. In shutdown, all functions are disabled drawing <1µA
supply current. Do not leave RUN floating.
GND Ground
Power Switch Output. It is the Switch note connection to Inductor. This pin connects
SW
to the drains of the internal P-CH and N-CH MOSFET switches.
Supply Input Pin. Must be closely decoupled to GND, Pin 2, with a 2.2µF or greater
VIN
ceramic capacitor.
VFB (Adjustable): Feedback Input Pin. Connect FB to the center point of the external
resistor divider. The feedback threshold voltage is 0.6V.
VFB/VOUT
VOUT (Fixed Output): Output Voltage Feedback Pin. An internal resistive divider divides
the output voltage down for comparison to the internal reference voltage.
REV1.1
- JAN 2009 RELEASED, JAN 2011 REVISED -
-2-


Part Number A7116
Description 1.5MHz 700mA Synchronous Step-Down Converter
Maker AiT Semiconductor
Total Page 14 Pages
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