AiT A7221TE6R Schematic [ru]

AiT Semiconductor Inc.

www.ait-ic.com

A7221

DESCRIPTION

FEATURES

ORDERING INFORMATION

Package Type

Part Number

APPLICATION

TYPICAL APPLICATION

DC-DC CONVERTER BUC K (STEP-DOWN)

2A, 20V SYNCHRONOUS

The A7221 is a current mode monolithic buck

voltage converter. Operating with an input range of

4.7V~20V, the A7221 delivers 2A of continuous

output current with two integrated N-Channel

MOSFETs. At light loads, regulators operate in low

frequency to maintain high efficiency and low output

ripple.

The A7221 guarantees robustness with over

current protection, thermal protection, start-up

current run-away protection, and input under

voltage lockout.

The A7221 is available in TSOT-26 package.

 4.7V to 20V operating input range 2A output

current

 Up to 95% efficiency
 High efficiency (>80%) at light load
 Fixed 500kHz Switching frequency
 Input under voltage lockout
 Start-up current run-away protection
 Over current protection and Hiccup
 Thermal protection
 Available in TSOT-26 Package

 Distributed Power Systems
 Networking Systems
 FPGA, DSP, ASIC Power Supplies
 Green Electronics/ Appliances
 Notebook Computers

TSOT-26 TE6

V: Halogen free Package

Note

R: Tape & Reel

SPQ:3,000pcs/Reel

AiT provides all RoHS products

Suffix “ V “ means Halogen free Package

REV3.0 - DEC 2013 RELEASED, MAR 2016 UPDATED - - 1 -

A7221TE6R

A7221TE6VR

2A Buck Voltage Converter

AiT Semiconductor Inc.

www.ait-ic.com

A7221

Pin #

Symbol

Function

PIN DESCRIPTION

DC-DC CONVERTER BUC K (STEP-DOWN)

2A, 20V SYNCHRONOUS

Top View

1 GND Power ground pin.

SW is the switching node that supplies power to the output. Connect the

2 SW

output LC filter from SW to the output load.

supplies power to the IC. Connect a 4.7V to 20V

IN

3 VIN

Input voltage pin. V

supply to V

and bypass VIN to GND with a suitably large capacitor to

IN

eliminate noise on the input to the IC.

Output feedback pin. FB senses the output voltage and is regulated by

4 FB

the control loop to 0.8V. Connect a resistive divider at FB.

5 EN Drive EN pin high to turn on the regulator and low to turn off the regulator.

Boostrap pin for top switch. A 0.1uF or larger capacitor should be

6 BST

connected between this pin and the SW pin to supply current to the top

switch and top switch driver.

REV3.0 - DEC 2013 RELEASED, MAR 2016 UPDATED - - 2 -

AiT Semiconductor Inc.

www.ait-ic.com

A7221

Parameter

Symbol

MIN

MAX

Units

Package

θJA

θJC

DC-DC CONVERTER BUC K (STEP-DOWN)

2A, 20V SYNCHRONOUS

ABSOLUTE MAXIMUM RATINGS

VIN, EN, SW PIN -0.3V~22V

BST PIN SW-0.3V~SW+5V

All other pins -0.3V~6V

Junction Temperature

NOTE1,2

150℃

Lead Temperature 260℃

Storage Temperature -65℃~+150℃

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.

RECOMMENDED OPERATING CONDITIONS

Input Voltage VIN 4.7 20 V

Output voltage V

0.8 18 V

OUT

Junction Temperature TJ -40 125 ℃

THERMAL PERFORMANCE

NOTE3

TSOT-26 110℃/W 55℃/W

NOTE1: The A7221 guarantees robust performance from -40°C to 150°C junction temperature. The junction temperature range

specification is assured by design, characterization and correlation with statistical process controls.

NOTE2: The A7221 includes thermal protection that is intended to protect the device in overload conditions. Thermal protection is active

when junction temperature exceeds the maximum operating junction temperature. Continuous operation over the specified
absolute maximum operating junction temperature may damage the device.

NOTE3: Measured on JESD51-7, 4-layer PCB.

REV3.0 - DEC 2013 RELEASED, MAR 2016 UPDATED - - 3 -