AiT A7221BE6R Schematic [ru]
AiT Semiconductor Inc.
www.ait-ic.com
A7221B
DC-DC CONVERTER BUCK (STEP-DOWN)
DESCRIPTION
FEATURES
ORDERING INFORMATION
Package Type
Part Number
A7221BE6R
A7221BE6VR
APPLICATION
TYPICAL APPLICATION
2A 16V 600kHz SYNCHRONOUS
The A7221B is a fully integrated, high– efficiency 2A
synchronous rectified step-down converter. The
A7221B operates at high efficiency over a wide
output current load range.
This device offers two operation modes, PWM
control and PFM Mode switching control, which
allows a high efficiency over the wider range of the
load.
The A7221B is available in SOT-26 package.
SOT-26 E6
High Efficiency: Up to 96%
600kHz Frequency Operation
2A Output Current
No Schottky Diode Required
3.5V to 16V Input Voltage Range
0.6V Reference
Slope Compensated Current Mode Control for
Excellent Line and Load Transient Response
Integrated internal compensation
Stable with Low ESR Ceramic Output Capacitors
Over Current Protection with Hiccup-Mode
Thermal Shutdown
Inrush Current Limit and Soft Start
-40°C to +85°C Temperature Range
Available in SOT-26 Package
V: Halogen free Package
Note
AiT provides all RoHS products
Suffix “ V “ means Halogen free Package
R: Tape & Reel
SPQ:3,000pcs/Reel
Distributed Power Systems
Digital Set Top Boxes
Flat Panel Television and Monitors
Wireless and DSL Modems
Notebook Computer
REV1.0 - SEP 2016 RELEASED - - 1 -
AiT Semiconductor Inc.
www.ait-ic.com
A7221B
DC-DC CONVERTER BUCK (STEP-DOWN)
Pin #
Symbol
Function
to the center point of the
PIN DESCRIPTION
2A 16V 600kHz SYNCHRONOUS
Top View
1 BS
Bootstrap. A capacitor connected between SW and BS pins is required to form
a floating supply across the high-side switch driver.
2 GND Ground
Adjustable version feedback input. Connect FB
3 FB
external resistor divider.
Drive this pin to a logic-high to enable the IC. Drive to a logic-low to disable the
4 EN
IC and enter micro-power shutdown mode.
5 VIN Power supply Pin
6 SW Switching Pin
REV1.0 - SEP 2016 RELEASED - - 2 -
AiT Semiconductor Inc.
www.ait-ic.com
A7221B
DC-DC CONVERTER BUCK (STEP-DOWN)
Parameter
Conditions
Min.
Typ.
Max.
Unit
2A 16V 600kHz SYNCHRONOUS
ABSOLUTE MAXIMUM RATINGS
VIN, Supply Voltage -0.3V ~ 25V
VSW, Switch Node Voltage -0.3V ~ (VIN+0.5V)
VBS, Boost Voltage VSW-0.3V ~ VSW+5V
All Other Pins -0.3V ~ 6V
Operating Temperature Range -40℃ ~ 85℃
Storage Temperature Range -65℃ ~ 150℃
Lead Temperature (Soldering,10s) 300℃
Stress beyond above listed “Absolute Maximum Ratings” may lead permanent damage to the device. These are stress ratings only and
operations of the device at these or any other conditions beyond those indicated in the operational sections of the specifications are not
implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
= 12V, V
V
IN
Input Voltage Range 3.5 16 V
UVLO Threshold 2 V
Supply Current in Operation VEN = 2.0V, VFB = 1.1V 0.4 0.6 mA
Supply Current in Shutdown VEN = 0V or VEN = GND 1 μA
Regulated Feedback Voltage 4.5V < VIN < 16V 0.588 0.6 0.612 V
High-side Switch On Resistance 90 mΩ
Low-side Switch On Resistance 70 mΩ
High-side Switch Leakage Current VEN = 0V, VSW = 0V 0 10 μA
Upper Switch Current Limit Minimum Duty Cycle 4.2 A
Oscillation Frequency 600 kHz
Maximum Duty Cycle VFB = 0.6V 92 %
Minimum On Time 60 ns
= 5V, TA = 25℃, unless otherwise stated
OUT
Thermal Shutdown 170 ℃
REV1.0 - SEP 2016 RELEASED - - 3 -
AiT Semiconductor Inc.
www.ait-ic.com
A7221B
DC-DC CONVERTER BUCK (STEP-DOWN)
1. Efficiency vs. I
OUT
(V
OUT
= 1.2V)
2. Efficiency vs. I
OUT
(V
OUT
= 3.3V)
3. Efficiency vs. I
OUT
(V
OUT
= 5.0V)
4. V
OUT
vs. I
OUT
(V
OUT
= 1.2V)
5. V
OUT
vs. I
OUT
(V
OUT
= 3.3V)
6. V
OUT
vs. I
OUT
(V
OUT
= 5.0V)
TYPICAL PERFORMANCE CHARACTERISTICS
Tested under, L=4.7uH, T
= 25°C, unless otherwise specified
A
2A 16V 600kHz SYNCHRONOUS
REV1.0 - SEP 2016 RELEASED - - 4 -
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