Low Input Voltage, Adjustable Frequency

2 A Synchronous Buck Regulator with EN/SYNC and Power OK

A8650

2

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Characteristic

Symbol

Notes

Rating

Unit

VIN Pin to GND

–0.3 to 6

V

Continuous

V

t < 50 ns

V

All other pins

–0.3 to 6.0

V

Operating Ambient Temperature

K temperature range

–40 to 125

ºC

Maximum Junction Temperature

150

ºC

Storage Temperature

–55 to 150

ºC

1

Operation at levels beyond the ratings 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.

2

(UVLO),cycle-by-cycleovercurrentprotection(OCP),hiccupmode

short circuit protection (HIC), overvoltage protection (OVP), and

thermal shutdown (TSD). In addition, the A8650 provides open

circuit, adjacent pin short circuit, and short to ground protection at

every pin to satisfy the most demanding automotive applications.

The A8650 is available in both 10-pin MSOP and DFN packages

with an exposed pad for enhanced thermal dissipation. It is lead

(Pb) free, with 100% matte tin leadframe plating.

• Stable with ceramic output capacitors

• Enable input, and Power OK (POK) output

• Cycle-by-cycle current limiting (OCP)

• Hiccup mode short circuit protection (HIC)

• Overvoltage protection (OVP)

• Overtemperature protection (TSD)

• Open circuit and adjacent pin short circuit tolerant

• Short to ground tolerant at every pin

Features and Benefits (continued)

Description (continued)

Characteristic

Symbol

Test Conditions*

Value

Unit

Package Thermal Resistance (LY)

On 4-layer PCB based on JEDEC standard

48

ºC/W

Package Thermal Resistance (EJ)

On 4-layer PCB based on JEDEC standard

45

ºC/W

*Additional thermal information available on the Allegro website.

Selection Guide

Part Number

Operating Ambient

Temperature Range

Package

Packing

Leadframe Plating

A8650KLYTR-T

–40 to 125

10-pin MSOP with

exposed thermal pad

4000 pieces

per 13-in. reel

100% matte tin

A8650KEJTR-T

-40 to 125

10-pin DFN with exposed

thermal pad

1500 pieces

per 7-in reel

100% matte tin

Specifications