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AiT Semiconductor

A7220 Datasheet Preview

A7220 Datasheet

2A SYNCHRONOUS STEP-DOWN CONVERTER

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AiT Semiconductor Inc.
www.ait-ic.com
 
A7220
DC-DC CONVERTER BUCK (STEP-DOWN)
4.3V TO 18V INPUT, 2A SYNCHRONOUS STEP-DOWN
CONVERTER WITH FAST TRANSIENT RESPONSE
DESCRIPTION
The A7220 is a current mode synchronous
buck converter, and has a proprietary
W-mode™® Gm curvature circuit that enables
fast transient response, enables the device to
adopt to both low ESR output capacitors, such
as POSCAP or SP-CAP, and ultra-low ESR
ceramic capacitors.
The A7220 operates from 4.3V to 18V VIN
input, and the output voltage can be
programmed between 0.918V to 14V with 2A
output current, and +/-1.5% high accuracy
output voltage.
Due to 95mΩ (High side) and 90mΩ (Low
side) integrated FETs, the A7220 works in high
efficiency (up to 94% @12V Input, 3.3V output)
The A7220 is available in SOP8 Package.
ORDERING INFORMATION
Package Type
Part Number
SOP8
A7220M8R
M
A7220M8VR
Note
R: Tape & Reel
V: Halogen free Package
AiT provides all RoHS products
Suffix “ V “ means Halogen free Package
FEATURES
2A Output Current
High Efficient Integrated FETs Optimized for portable
application:
95mΩ (High side) and 90mΩ (Low side)
High Efficiency
Up to 95% Efficiency @ 5V Input, 3.3V Output
Up to 93% Efficiency @ 12V Input, 3.3V Output
Wide Input Voltage Range: 4.3V to 18V @ 2A loading
Wide Output Voltage Range: 0.918V to 14V @2A
loading ( 32W output @max)
Low Output Ripple and Allows Ceramic Output Capacitor
Thermal Shutdown Protection
340KHz Switching Frequency(fsw)
Cycle By Cycle Over Current Limit
+/-1.5% High Accuracy Feedback Voltage
Available in SOP8 and package
APPLICATION
Wide Range of Applications for Low Voltage System
Digital TV Power Supply
High Definition Blu-ray Disc Players
Networking Home Terminal
Digital STB
Ideal for Portable Applications
TYPICAL APPLICATION
REV3.0
 
- JUL 2010 RELEASED, FEB 2012 UPDATED -
-1-




AiT Semiconductor

A7220 Datasheet Preview

A7220 Datasheet

2A SYNCHRONOUS STEP-DOWN CONVERTER

No Preview Available !

AiT Semiconductor Inc.
www.ait-ic.com
 
PIN DESCRIPTION
A7220
DC-DC CONVERTER BUCK (STEP-DOWN)
4.3V TO 18V INPUT, 2A SYNCHRONOUS STEP-DOWN
CONVERTER WITH FAST TRANSIENT RESPONSE
Pin #
1
2
3
4
5
6
7
8
Symbol
BS
IN
SW
GND
FB
COMP
EN
SS
Top View
Function
Supply input for high-side NFET gate driver (boost terminal). Connect
capacitor from this pin to SW pin. An internal PN diode is connected
between VREG to BS pin.
Power input and connected to high side NFET drain
Switch node connection between high-side NFET and low-side NFET.
Also serve as inputs to current comparators.
Signal ground pin, also serve as ground returns for low-side NFET.
Converter feedback input. Connect with feedback resistor divider.
Compensation Node. Used to compensate control loop. Connect a
series RC network from COMP to G. In some cases, an additional
capacitor is required
Enable control input
Soft-start control. A external capacitor should be connected to GND.
REV3.0
 
- JUL 2010 RELEASED, FEB 2012 UPDATED -
-2-


Part Number A7220
Description 2A SYNCHRONOUS STEP-DOWN CONVERTER
Maker AiT Semiconductor
Total Page 12 Pages
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