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PDF A7220 Data sheet ( Hoja de datos )
| Número de pieza | A7220 | |
| Descripción | 2A SYNCHRONOUS STEP-DOWN CONVERTER | |
| Fabricantes | AiT Semiconductor | |
| Logotipo |  |
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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-
1 page  
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
Parameter
Input Under Voltage Lockout
Threshold Hysteresis
Soft-Start Current
Setting Feedback Voltage by
Using Soft-Start Voltage
Soft-Start Period
Thermal Shutdown
Symbol
Conditions
VHys_3
ISS
VFB-SS
TSS
TSD
VSS=0V
Only when VSS <
0.85V by adding
resistor on SS pin
VSS=
Iss*RSS=4.4μA*RSS
CSS=0.1μF
Min Typ. Max Unit
600 mV
4.25
4.40
4.55
μA
VSS+30
mV
mV
15 ms
160 ℃
REV3.0
- JUL 2010 RELEASED, FEB 2012 UPDATED -
-5-
5 Page 
AiT Semiconductor Inc.
www.ait-ic.com
PACKAGE INFORMATION
Dimension in SOP8 (Unit: mm)
A7220
DC-DC CONVERTER BUCK (STEP-DOWN)
4.3V TO 18V INPUT, 2A SYNCHRONOUS STEP-DOWN
CONVERTER WITH FAST TRANSIENT RESPONSE
Symbol
Min
Max
A
1.350
1.750
A1
0.100
0.250
A2
1.350
1.550
b
0.330
0.510
c
0.170
0.250
D
4.700
5.100
E
3.800
4.000
E1
5.800
6.200
e 1.270(BSC)
L
0.400
1.270
θ 0° 8°
REV3.0
- JUL 2010 RELEASED, FEB 2012 UPDATED -
- 11 -
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet A7220.PDF ] | |
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