UPC1933 datasheet, PDF - EEWORLD Datasheet

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UPC1933: Description0.021 A SWITCHING REGULATOR, 800 kHz SWITCHING FREQ-MAX, PDSO8; CategoryPower/power management; File Size102KB，20 Pages; ManufacturerNEC ( Renesas ); Websitehttps://www2.renesas.cn/zh-cn/

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0.021 A SWITCHING REGULATOR, 800 kHz SWITCHING FREQ-MAX, PDSO8

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DATA SHEET

BiCMOS INTEGRATED CIRCUIT

PC1933

DC-DC CONVERTER CONTROL IC

DESCRIPTION

The

PC1933 is an IC that controls a low-voltage input DC-DC converter. This IC is suitable for an operation with3-V,

3.3-V input or a lithium ion secondary battery input, because the minimum operating supply voltage is 2.5 V.

Because of its wide operating voltage range, it can also be used to control DC-DC converters that use an AC adapter for

input.

FEATURES

•

Low supply voltage: 2.5 V (MIN.)

•

Operating voltage range: 2.5 to 20 V (breakdown voltage: 30 V)

•

Timer latch circuit for short-circuit protection.

•

Ceramic capacitor with low capacitance (0.1

F) can be used for short-circuit protection.

•

Open drain output (1 cannel: This output can be used to control a step-down converter, a step-up converter.)

•

Dead time is internally fixed to 85 %.

•

Soft start function (with a circuit to convert the timer latch circuit.)

ORDERING INFORMATION

Part Number

Package

8-pin plastic SOP (5.72 mm (225))

PC1933GR

The information in this document is subject to change without notice. Before using this document, please

confirm that this is the latest version.

Not all devices/types available in every country. Please check with local NEC representative for

availability and additional information.

Document No. G13690EJ3V0DS00 (3rd edition)

Date Published April 2000 NS CP (K)

Printed in Japan

The mark

shows major revised points.

1998

PC1933

CONTENTS

1. ELECTRICAL SPECIFICATIONS ................................................................................................................ 5

2. CONFIGURATION AND OPERATION OF EACH BLOCK.................................................................... 11

2.1 Reference Voltage Generator ...........................................................................................................................11

2.2 Oscillator ...........................................................................................................................................................11

2.3 Under Voltage Lock-out Circuit ........................................................................................................................11

2.4 Error Amplifier...................................................................................................................................................11

2.5 PWM Comparator..............................................................................................................................................12

2.6 Timer Latch-Method Short Circuit Protection Circuit ....................................................................................12

2.7 Output Circuit....................................................................................................................................................12

3. NOTES ON USE........................................................................................................................................ 13

3.1 Setting the Output Voltage ...............................................................................................................................13

3.2 Setting the Oscillation Frequency ...................................................................................................................13

3.3 Preventing Malfunction of the Timer Latch-Method Short Circuit Protection Circuit..................................13

3.4 ON/OFF Control.................................................................................................................................................14

3.5 Maximum Duty Limit .........................................................................................................................................15

3.6 Notes on Actual Pattern Wiring........................................................................................................................15

4. APPLICATION EXAMPLE ......................................................................................................................... 16

4.1 Application Example.........................................................................................................................................16

4.2 List of External Parts ........................................................................................................................................16

5. PACKAGE DRAWING ................................................................................................................................ 17

6. RECOMMENDED SOLDERING CONDITIONS ....................................................................................... 18

Data Sheet G13690EJ3V0DS00

UPC1933 Related Products

	UPC1933	UPC1933GR
Description	0.021 A SWITCHING REGULATOR, 800 kHz SWITCHING FREQ-MAX, PDSO8	0.021 A SWITCHING REGULATOR, 800 kHz SWITCHING FREQ-MAX, PDSO8

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