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AiT Semiconductor

A7121 Datasheet Preview

A7121 Datasheet

2A 1.2MHz HIGH EFFICIENCY SYNCHRONOUS STEP-DOWN DC-DC CONVERTER

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AiT Semiconductor Inc.
www.ait-ic.com
A7121
2A 1.2MHz HIGH EFFICIENCY
SYNCHRONOUS STEP-DOWN DC-DC CONVERTER
DESCRIPTION
FEATURES
The A7121 is a 1.2MHz constant frequency current
mode PWM step-down converter. It is ideal for portable
equipment requiring very high current up to 2A from
single-cell Lithium-ion batteries while still achieving over
90% efficiency during peak load conditions.
The A7121 also can run at 100% duty cycle for low
Input Voltage Range: 2.5V to 6.0V
Output Voltages from 0.6V to VIN
2A Output Current
High Efficiency: Up to 95%
1.2MHz Constant Switching Frequency
Low RDS(ON) Internal Switches: 0.15Ω
Allows Use of Ceramic Capacitors
dropout operation, extending battery life in portable
systems while light load operation provides very low
output ripple for noise sensitive applications.
The A7121 can supply up to 2A output load current from
a 2.5V to 6.0V input voltage and the output voltage can
be regulated as low as 0.6V. The high switching
frequency minimizes the size of external components
Current Mode Operation for Excellent Line
and Load Transient Response
Short-Circuit and Thermal Fault Protection
Soft Start
Low Dropout Operation: 100% Duty Cycle
Low Shutdown Current : ISHUTDOWN < 1μA
-40℃ to +85℃ Temperature Range
Available in DFN10 and MSOP10 Packages.
while keeping switching losses low. The internal slope
compensation setting allows the device to operate with
smaller inductor values to optimize size and provide
efficient operation.
The A7121 is available in DFN10 (3x3mm) and MSOP10
package.
APPLICATIONS
Cellular Phones
Digital Cameras
DSP Core Supplies
Printer
Portable Instruments
ORDERING INFORMATION
xDSL
MID or UMPC
Package Type
Part Number
DFN10
J10
A7121J10R-XX
A7121J10VR-XX
MSOP10
A7121MS10R-XX
MS10
A7121MS10VR-XX
Note
XX: 18=1.8V, ADJ=Adjustable
V: Green Package
R : Tape & Reel
AiT provides all Pb free products
Suffix “ V “ means Green Package
TYPICAL APPLICATION
REV1.0 -FEB 2010 RELEASED -
-1-




AiT Semiconductor

A7121 Datasheet Preview

A7121 Datasheet

2A 1.2MHz HIGH EFFICIENCY SYNCHRONOUS STEP-DOWN DC-DC CONVERTER

No Preview Available !

AiT Semiconductor Inc.
www.ait-ic.com
PIN DESCRIPTION
A7121
2A 1.2MHz HIGH EFFICIENCY
SYNCHRONOUS STEP-DOWN DC-DC CONVERTER
Pin #
1
2
3
4
5
6
7
8
9
10
Symbol
EN
IN
AIN
AGND
FB/OUT
AGND
LX
LX
PGND
PGND
EP
Top View
Top View
Function
Enable pin. Active high. In shutdown, all functions are disabled drawing <1μA supply
current. Do not leave EN floating.
Power supply input pin. Must be closely decoupled to AGND with a 22μF or greater
ceramic capacitor.
Analog supply input pin. Provides bias for internal circuitry.
Analog ground pin
FB pin (A7121-ADJ): Adjustable version feedback input. Connect FB to the center point
of the external resistor divider. The feedback threshold voltage is 0.6V. OUT pin
(A7121-18): Fixed version feedback input. Connect OUT to the output voltage, VOUT.
Analog ground pin
Switching node pin. Connect the output inductor to this pin.
Switching node pin. Connect the output inductor to this pin.
Power ground pin
Power ground pin
Power ground exposed pad. Must be connected to bare copper ground plane.
REV1.0 -FEB 2010 RELEASED -
-2-


Part Number A7121
Description 2A 1.2MHz HIGH EFFICIENCY SYNCHRONOUS STEP-DOWN DC-DC CONVERTER
Maker AiT Semiconductor
Total Page 24 Pages
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