Datasheet > 3946_04

3946_04

更新时间： 2024-11-27 02:58:55

品牌	Logo	应用领域
急速微 - ALLEGRO		控制器
页数	文件大小	规格书
13页	313K
描述
Half-Bridge Power MOSFET Controller

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3946_04 数据手册

3946

Half-Bridge Power MOSFET Controller

The A3946 is designed speciﬁcally for applications that require

high power unidirectional dc motors, three-phase brushless dc motors, or

other inductive loads. The A3946 provides two high-current gate drive

outputs that are capable of driving a wide range of power N-channel

MOSFETs. The high-side gate driver switches an N-channel MOSFET

A3946KLB SOIC

VREG

16 VBB

CP2

CP1

PGND

15 VREF

14 DT

that controls current to the load, while the low-side gate driver switches

an N-channel MOSFET as a synchronous rectiﬁer.

LGND

RESET

IN2

A bootstrap capacitor provides the above-battery supply voltage

required for N-channel MOSFETs. An internal charge pump for the

high side allows for dc (100% duty cycle) operation of the half-bridge.

IN1

Scale 1:1

BOOT

~FAULT

The A3946 is available in a choice of two power packages: a

16-lead SOIC with internally fused leads (part number sufﬁx LB), and

a 16-lead TSSOP with exposed thermal pad (sufﬁx LP). Both packages

have a lead (Pb) free version, with 100% matte tin plated leadframes

(sufﬁx -T).

A3946KLP TSSOP with Exposed Thermal Pad

VREG

CP2

CP1

PGND

VBB

VREF

LGND

RESET

IN2

FEATURES

ꢀ

On-chip charge pump for 7 V minimum input supply voltage

IN1

Scale 1:1

High-current gate drive for driving a wide range of

N-channel MOSFETs

BOOT

~FAULT

ꢀ

Bootstrapped gate drive with charge pump for 100% duty cycle

Overtemperature protection

ABSOLUTE MAXIMUM RATINGS

Load Supply Voltage, V_BB............................. 60 V

Logic Inputs ..................................–0.3 V to 6.5 V

Pin S……..........................................–4 V to 60 V

Pin GH ...........................................–4 V to 75 V

Pin BOOT….. ................................–0.6 V to 75 V

Pin DT ........................................................V_REF

Pin VREG ......................................–0.6 V to 15 V

Package Thermal Resistance, R_JA

Undervoltage protection

–40ºC to 135ºC ambient operation

Selection Guide

Part Number

A3946KLB

Pb-free

Packing

Package

A3946KLB..................................... 48°C/W¹

A3946KLB..................................... 38°C/W²

A3946KLP..................................... 44°C/W¹

–

Yes

–

47 pieces/tube

A3946KLB-T

A3946KLBTR

A3946KLBTR-T

A3946KLP

16-pin SOIC with internally

fused leads

1000 pieces/reel

96 pieces/tube

4000 pieces/reel

A3946KLP..................................... 34°C/W²

Operating Temperature Range, T_A.. –40°C to +135°C

Junction Temperature, T_J...........................+150°C

Storage Temperature Range, T_S....-55°C to +150°C

Notes:

Yes

–

A3946KLP-T

A3946KLPTR

A3946KLPTR-T

Yes

–

16-pin TSSOP with exposed

thermal pad

Yes

1. Measured on a two-sided PCB with 3 in.²of

2 oz. copper.

2. Measured on JEDEC standard High-K board.

12 3 4 5 6 7...13

中文翻译

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