A4406 データシートの表示（PDF） - Allegro MicroSystems

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A4406

Constant On-Time Buck Regulator With One External and One Internal Linear Regulator

Allegro MicroSystems 

A4406

Constant On-Time Buck Regulator

With One External and One Internal Linear Regulator

Features and Benefits (continued)

overcurrent foldback protection

• Logic enable input (ENB pin)

• Ignition enable input (ENBAT pin)

• Ignition status indicator (ENBATS pin)

• Buck pulse-by-pulse overcurrent protection

• Buck LX short circuit protection (latched)

• Missing asynchronous diode protection (latched)

• Switcher (VREG pin), 3.3 V (V33 pin), and charge pump

(VCP pin) undervoltage lockout protection (UVLO)

• Thermal shutdown protection (TSD)

Description (continued)

overcurrent protection. The A4406 also features power-on-reset

with adjustable delay for the microprocessor output.

The A4406 is supplied in a low profile (1.2 mm max) 20-pin TSSOP

package with exposed thermal pad (suffix LP). The package is lead

(Pb) free with 100% matte-tin leadframe plating

Selection Guide

Part Number

A4406KLPTR-T

Packing

4000 pieces per 13-in. reel

Absolute Maximum Ratings1

Characteristic

Symbol

Notes

Rating

Unit

VIN Pin

LX Pin

VIN

VLX

t < 250 ns

–0.3 to 50

V

–0.3 to 50

V

–1.5

V

VCP, CP1, and CP2 Pins

VVCP , VCPx

–0.3 to 60

V

ISEN– Pin

VISEN–

–0.5 to 1

V

ISEN+ Pin

VISEN+

–0.5 to 0.5

V

ENBAT Pin2

VENBAT

–0.3

V

ENBAT Pin Current

IENBAT

–50 to 50

mA

VREG Pin

VVREG

–0.3 to 8

V

V33 Pin

VV33

–0.3 to 7

V

G33 Pin3

VG33

–0.3

V

CLV33 Pin

VCLV33

–0.3 to 10

V

V5P Pin

VV5P

–0.3 to VIN+0.5

V

TON Pin

VTON

–0.3 to 50

V

NPOR and CPOR Pins

VxPOR

–0.3 to 7

V

ENB and ENBATS Pins

VEN , VENBATS

–0.3 to 7

V

Operating Ambient Temperature

TA

Range K

–40 to 135

°C

Junction Temperature

TJ(max)

–40 to 150

°C

Storage Temperature Range

Tstg

–40 to 150

°C

1Absolute maximum ratings are limiting values that should not be exceeded under worst case operating conditions or damage may occur.

2The ENBAT pin is internally clamped to approximately 8.5 V due to an ESD protection device.

3The G33 pin is internally clamped by an ESD protection device. Clamp voltages range from 10 V (min) to 15 V (max).

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

Characteristic

Symbol

Test Conditions*

Package Thermal Resistance

RθJA

Estimated on 4-layer PCB based on JEDEC standard

*Additional thermal information available on the Allegro website.

Value Unit

32 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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