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A7220 데이터시트 PDF




AiT Semiconductor에서 제조한 전자 부품 A7220은 전자 산업 및 응용 분야에서
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부품번호 A7220 기능
기능 2A SYNCHRONOUS STEP-DOWN CONVERTER
제조업체 AiT Semiconductor
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A7220 데이터시트, 핀배열, 회로
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-




A7220 pdf, 반도체, 판매, 대치품
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
ELECTRICAL CHARACTERISTICS
Over operating free-air temperature range(unless otherwise noted) VIN=12V, TA=25℃
Parameter
Symbol
Conditions
Min Typ.
Operating-non-switching supply
current
VIN current, TA=25℃,
IIN
EN=1.8V,VFB=1.0V
-
1.3
Shut Down Supply Current
ISDN VEN=0V
-2
Feedback Voltage
VFB 4.3V ≤VIN≤18V
0.900 0.913
Feedback Overvoltage
Threshold
OVP
- 1.1
Error Amplifier Voltage Gain
Aea
- 1000
Error Amplifier
Transconductance
Gea ΔIC=+/-10μA
- 900
High Side Switch ON Resistance RDS(on)_1
- 95
Low Side Switch ON Resistance RDS(on)_2
- 90
High Side Switch Leakage
Current
ILEAKGAE VEN=0V, VSW=0V
--
High Side Switch Current Limit ILM_H Minimum Duty Cycle 2.8 3.5
Low Side Switch Current Limit
ILM_L From Drain to Source
-
1.0
COMP Voltage to Current Sense
Transconductance
Gcs
- 3.5
Switching Frequency
Fsw_1
- 340
Short Circuit Switching
Frequency
Fsw_2 VFB=0V
- 100
Maximum Duty Cycle
Dmax VFB=1.0V
- 90
Minimum ON Time
TON_min
220
EN Threshold Voltage
VEN_1 VEN Rising
1.1 1.5
EN Threshold voltage’s
Hysteresis
VHys_1
- 100
EN Lockout Threshold Voltage
VEN_2
1.8 2.0
EN Lockout Hysteresis
VHys_2
- 210
Input Under Voltage Lockout
Threshold
VUVLO VIN Rising
3.0 3.6
Max Unit
2.0 mA
4
0.926
μA
V
-V
- V/V
- μA/V
- mΩ
- mΩ
10 μA
-A
-A
- A/V
- KHz
- KHz
-%
- ns
2.0 V
- mV
2.2 V
- mV
4.2 V
REV3.0
 
- JUL 2010 RELEASED, FEB 2012 UPDATED -
-4-

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A7220 전자부품, 판매, 대치품
AiT Semiconductor Inc.
www.ait-ic.com
 
APPLICATION INFORMATION
APPLICATION SCHEMATIC (1)
With Electrolytic Capacitor
A7220
DC-DC CONVERTER BUCK (STEP-DOWN)
4.3V TO 18V INPUT, 2A SYNCHRONOUS STEP-DOWN
CONVERTER WITH FAST TRANSIENT RESPONSE
Figure 1
Compatible with main competitors without any external component change
RECOMMENDED COMPONENT SELECTION
VOUT
COUT
R1
1.0V 22Μf Ceramic X2
1.0K
1.2V 22μF Ceramic X2
4.7K
1.8V 22μF Ceramic X2
9.7K
2.5V 22μF Ceramic X2
12.0K
3.3V 22μF Ceramic X2
26.1K
5.0V 22μF Ceramic X2
30.0K
1.0V 47μF SP Cap
1.0K
1.2V 47μF SP Cap
4.7K
1.8V 47μF SP Cap
9.7K
2.5V 47μF SP Cap
12.0K
3.3V 47μF SP Cap
26.1K
5.0V 47μF SP Cap
30.0K
R2
10K
15K
10K
6.8K
10K
6.8K
10K
15K
10K
6.8K
10K
6.8K
R3(comp)
50Ω
100Ω
300Ω
1.5KΩ
2.2KΩ
2.7KΩ
50Ω
100Ω
300Ω
1.5KΩ
2.2KΩ
2.7KΩ
C4(comp)
10nF
10nF
3.3nF
3.3nF
3.3nF
3.3nF
10nF
10nF
3.3nF
3.3nF
3.3nF
3.3nF
C5(optional)
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
L(inductor)
3.3μH
3.3μH
4.7μH
6.8μH
10μH
22μH
3.3μH
3.3μH
4.7μH
6.8μH
10μH
22μH
REV3.0
 
- JUL 2010 RELEASED, FEB 2012 UPDATED -
-7-

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