Datasheet > MIC38HC42

MIC38HC42

更新时间： 2023-12-06 20:02:35

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
20页	1316K
描述
The MIC38HC4x family are fixed frequency current-mode PWM controllers with 1A drive current capabi

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MIC38HC42 数据手册

MIC38HC42/3/4/5

BiCMOS 1A Current-Mode PWM Controllers

Features

General Description

• Fast 20 ns Output Rise and 15 ns Output Fall

Times

The MIC38HC4x family are fixed-frequency

current-mode PWM controllers with 1A drive current

capability. Microchip’s BiCMOS devices are

pin-compatible with 384x bipolar devices. Their high

output drive, with fast rise and fall times, combined with

low startup current make them ideal PWM controllers

when high efficiency is required.

• –40°C to +85°C Temperature Range Exceeds

UC284x Specifications

• High-Performance, Low-Power BiCMOS Process

• Ultra-Low Start-Up Current (50 μA Typical)

• Low Operating Current (4 mA Typical)

• High Output Drive (1A Peak Current, HC Version)

• CMOS Outputs with Rail-to-Rail Swing

• Current-Mode Operation up to 500 kHz

• Trimmed 5V Bandgap Reference

Undervoltage lockout circuitry allows the ’42 and ’44

versions to start up at 14.5V and operate down to 9V,

and the ’43 and ’45 versions start at 8.4V with operation

down to 7.6V. All versions operate up to 20V.

When compared to bipolar UC384x devices operating

from a 15V supply, start-up current has been reduced

to 50 μA typical and operating current has been

reduced to 4.0 mA typical. Decreased output rise and

fall times drive larger MOSFETs, and rail-to-rail output

capability increases efficiency, especially at lower

supply voltages. The MIC38HC4x also features a

trimmed oscillator discharge current and bandgap

reference.

• Pin-for-Pin Compatible with

UC3842/3843/3844/3845(A)

• Trimmed Oscillator Discharge Current

• UVLO with Hysteresis

• Low Cross-Conduction Currents

Applications

• Current-Mode, Offline, Switched-Mode Power

Supplies

MIC38HC4x-1 is available in 14-lead plastic DIP and

SOIC packages. 8-lead devices feature small size,

while 14-lead devices separate the analog and power

connections for improved performance and power

dissipation.

• Current-Mode, DC-to-DC Converters

• Step-Down “Buck” Regulators

• Step-Up “Boost” Regulators

• Flyback, Isolated Regulators

• Forward Converters

• Synchronous FET Converters

Package Types

MIC38HC4x

8-Lead SOIC (M)

8-Lead PDIP (N)

(Top View)

MIC38HC4x-1

14-Lead SOIC (M)

14-Lead PDIP (N)

(Top View)

MIC38HC4x

MIC38HC4x-1

COMP

VREF

VDD

OUT

GND

C OMP

14 VR E F

13 NC

ISNS

RT/CT

12 VDD

11 VD

IS NS

10 OUT

AG ND

P G ND

R T/C T

 2023 Microchip Technology Inc. and its subsidiaries

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