MIC38HC43BN Micrel Inc, MIC38HC43BN Datasheet

MIC38HC43BN

Manufacturer Part Number

MIC38HC43BN

Description

IC CTRLR PWM CURRENT MODE 8-DIP

Manufacturer

Micrel Inc

Datasheet

1.MIC38HC43YM_TR.pdf (8 pages)

Specifications of MIC38HC43BN

Pwm Type

Current Mode

Number Of Outputs

Frequency - Max

500kHz

Duty Cycle

96%

Voltage - Supply

7.6 V ~ 20 V

Buck

Yes

Boost

Yes

Flyback

Yes

Inverting

Doubler

Divider

Cuk

Isolated

Yes

Operating Temperature

-40°C ~ 85°C

Package / Case

8-DIP (0.300", 7.62mm)

Frequency-max

500kHz

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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MIC38HC42/3/4/5

General Description

The MIC38HC4x family are fixed frequency current-mode

PWM controllers with 1A drive current capability. Micrel’s

BiCMOS devices are pin-compatible with 384x bipolar de-

vices. Their high output drive, with fast rise and fall times,

combined with low startup current make it an ideal PWM

controller where high efficiency is required.

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 50µA

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 effi-

ciency, especially at lower supply voltages. The MIC38HC4x

also features a trimmed oscillator discharge current and

bandgap reference.

MIC38HC4x-1 is available in 14-pin plastic DIP and SOIC

packages. 8-pin devices feature small size, while 14-pin

devices separate the analog and power connections for

improved performance and power dissipation.

Functional Diagram

April 2005

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

RT/CT

VREF

VDD

7 (12)

8 (14)

4 (7)

2 (3)

( ) pins are on MIC38HC4x-1 (14-lead) versions only

* MIC38HC4x (8-lead) versions only

†

‡

MIC38HC42, MIC38HC43 (96% max. duty cycle) versions only

MIC38HC44, MIC38HC45 (50% max. duty cycle) versions only

2.5V

COMP

1 (1)

35V

GND*(AGND)

Reference

Oscillator

(9)

ISNS

3 (5)

UVLO

Features

• Fast 20ns output rise and 15ns output fall times

• –40°C to +85°C temperature range

• High-performance, low-power BiCMOS Process

• Ultralow start-up current (50µA typical)

• Low operating current (4mA typical)

• High output drive (1A peak current, HC version)

• CMOS outputs with rail-to-rail swing

• Current-mode operation up to 500kHz

• Trimmed 5V 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, off-line, switched-mode power supplies

• Current-mode, dc-to-dc converters.

• Step-down “buck” regulators

• Step-up “boost” regulators

• Flyback, isolated regulators

• Forward converters

• Synchronous FET converters

BiCMOS 1A Current-Mode PWM Controllers

exceeds UC284x specifications

MIC38HC42/3/4/5

†

‡

(VD)

(11)

OUT

6 (10)

(PGND)

(8)

M9999-042205

Micrel, Inc.

Related parts for MIC38HC43BN

MIC38HC43BN Summary of contents

Page 1

MIC38HC42/3/4/5 General Description The MIC38HC4x family are fixed frequency current-mode PWM controllers with 1A drive current capability. Micrel’s BiCMOS devices are pin-compatible with 384x bipolar de- vices. Their high output drive, with fast rise and fall times, combined with low ...

Page 2

... MIC38HC42/3/4/5 Ordering Information Standard MIC38HC42BN MIC38HC43BN MIC38HC44BN MIC38HC45BN MIC38HC42-1BN MIC38HC43-1BN MIC38HC44-1BN MIC38HC45-1BN MIC38HC42BM MIC38HC43BM MIC38HC44BM MIC38HC45BM MIC38HC42-1BM MIC38HC43-1BM MIC38HC44-1BM MIC38HC45-1BM Selection Guide Duty Cycle 50% M9999-042205 Part Number Junction Pb-Free Temp. Range MIC38HC42YN –40°C to +85°C MIC38HC43YN –40°C to +85°C MIC38HC44YN – ...

Page 3

MIC38HC42/3/4/5 Pin Configuration MIC38HC4x COMP ISNS 3 RT/CT 4 8-Pin DIP (N) 8-Lead SOIC (M) Pin Description Pin Number Pin Number Pin Name -1BN, -1BM ...

Page 4

MIC38HC42/3/4/5 Absolute Maximum Ratings Zener Current (V ) ................................................... 30mA DD ≥ Operation at 18V may require special precautions (Note 6). Supply Voltage (V ), Note 6 ....................................... 20V DD Switch Supply Voltage (V ) .......................................... 20V D Current Sense ...

Page 5

MIC38HC42/3/4/5 Parameter Test Conditions Current Sense Gain Notes 2, 3 MaximumThreshold V COMP PSRR 12 ≤ V Input Bias Current Delay to Output Output R ‘HC’ High I DS(ON) SOURCE R ‘HC’ Low I DS(ON) SINK Rise Time T A ...

Page 6

MIC38HC42/3/4/5 Typical Characteristics Oscillator Frequency Configuration 100 200pF 470pF 1nF 1.8nF 10 4.7nF 10nF V = 15V 1x10 1x10 1x10 OSCILLATOR FREQUENCY (Hz) Current Sense Amplifier vs. Error Amplifier Output 1.2 1.0 125°C 0.8 0.6 ...

Page 7

MIC38HC42/3/4/5 Package Information 0.018 (0.57) .235 (5.969) .215 (5.461) .160 MAX (4.064) .160 (4.064) .100 (2.540) April 2005 PIN 1 DIMENSIONS: INCH (MM) 0.380 (9.65) 0.370 (9.40) 0.135 (3.43) 0.125 (3.18) 0.380 (9.65) 0.130 (3.30) 0.320 (8.13) 0.100 (2.54) 0.0375 ...

Page 8

... MAX) 0.057 (1.45) 0.049 (1.25) MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. ...

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