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A4407

2.2 MHz Constant On-Time Buck Regulator With Two External and Two Internal Linear Regulators

Allegro MicroSystems 

A4407

2.2 MHz Constant On-Time Buck Regulator

With Two External and Two Internal Linear Regulators

Selection Guide

Part Number

Operating Ambient

Temperature Range

TA, (°C)

A4407KLPTR-T

–40 to 135

*Contact Allegro® for additional packing options.

Package

24-pin TSSOP with

exposed thermal pad

Packing*

4000 pieces per

13-in. reel

Leadframe

Plating

100% matte tin

Absolute Maximum Ratings*

Characteristic

Symbol

Notes

Rating

Unit

VIN Pin

−0.3 to 50

V

LX Pin

VLX

t < 250 ns

–0.3 to 50

V

–1.5

V

VCP, CP1, CP2 Pins

−0.3 to 60

V

ISEN– Pin

−0.5 to 1

V

ISEN+ Pin

−0.5 to 0.5

V

ENBAT Pin

The ENBAT pin is internally clamped to approximately 8.5 V

due to an ESD protection device.

−0.3

V

−50 to 50

mA

VREG Pin

−0.3 to 8

V

G1V2 and G3V3 Pins

These pins are internally clamped by an ESD protection

device. Clamp voltages range from 10 V (min) to 15 V (max).

−0.3

V

CL1V2 and CL3V3 Pins

−0.3 to 10

V

V5P Pin

V5 Pin

–0.3 to VIN+0.5

V

−0.3 to 7

V

TON Pin

−0.3 to 50

V

NPOR, CPOR, ENB, ENBATS,

TRACK, 1V2, and 3V3 Pins

−0.3 to 7

V

Operating Ambient Temperature

TA

Range K

−40 to 135

ºC

Junction Temperature

TJ

−40 to 150

ºC

Storage Temperature Range

Tstg

−40 to 150

ºC

*Absolute Maximum Ratings are limiting values that should not be exceeded under worst case operating conditions or damage may occur. Stresses

beyond those listed in this table may cause permanent damage to the device. The Absolute Maximum ratings are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the Electrical Characteristics table is not implied. Exposure to

Absolute-Maximum–rated conditions for extended periods may affect device reliability.

Thermal Characteristics may require derating at maximum conditions, see application information

Characteristic

Symbol

Test Conditions*

Package Thermal Resistance

RθJA

On 4-layer PCB based on JEDEC standard

*Additional thermal information available on the Allegro® website.

Value Unit

28 ºC/W

Allegro MicroSystems, Inc.

2

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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