Fujitsu MB39A105 - Manual

Fujitsu MB39A105

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Table of Contents:

  • Page 2 – PIN ASSIGNMENT
  • Page 3 – PIN DESCRIPTION; Symbol
  • Page 4 – BLOCK DIAGRAM
  • Page 6 – ELECTRICAL CHARACTERISTICS
  • Page 7 – TYPICAL CHARACTERISTICS; RT terminal
  • Page 10 – FUNCTIONS; DC/DC Converter Functions
  • Page 11 – Short-circuit protection circuit; On/off setting conditions of power supply
  • Page 12 – Triangular oscillation frequency : fosc; • Output Voltage Setting Circuit
  • Page 13 – SETTING THE SOFT-START TIMES; ) connected to CSCP terminal are charged at 11; CSCP terminal voltage; L priority
  • Page 14 – When the capacitor C; Timer-latch short-circuit protection circuit
  • Page 15 – FB voltage
  • Page 16 – I/O EQUIVALENT CIRCUIT; Error amplifier block
  • Page 17 – APPLICATION EXAMPLE
  • Page 18 – PARTS LIST; COMPONENT
  • Page 19 – SELECTION OF COMPONENTS; • Nch MOS FET
  • Page 20 – tf; ton
  • Page 22 – • Flyback diode
  • Page 23 – • Smoothing Capacitor
  • Page 24 – REFERENCE DATA; Conversion; efficiency; Load current; Switching Wave Form; Ta
  • Page 25 – USAGE PRECAUTION; Take appropriate static electricity measures.; to 1 M; Do not apply negative voltages.; ORDERING INFORMATION; Part number
  • Page 26 – PACKAGE DIMENSION
  • Page 27 – FUJITSU LIMITED; FUJITSU LIMITED Printed in Japan
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DS04-27233-2E

FUJITSU SEMICONDUCTOR

DATA SHEET

ASSP For Power Supply Applications
(General Purpose DC/DC Converter)

1-ch DC/DC Converter IC

for low voltage

MB39A105

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DESCRIPTION

The MB39A105 is 1-channel DC/DC conver ter IC using pulse width modulation (PWM). This IC is ideal for up
conversion.
The minimum operating voltage is low (1.8 V) , and the MB39A105 is best for built-in power supply such as LCD
monitors. Also the short-circuit protection detection output function prevents input/output short on a chopper type
up-converter.
This product is covered by US Patent Number 6,147,477.

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FEATURES

• Power supply voltage range : 1.8 V to 6 V
• Reference voltage accuracy :

±

1

%

• High-frequency operation capability : 1 MHz (Max)
• Built-in standby function: 0

µ

A (Typ)

• Built-in timer-latch shor t-circuit protection circuit
• Built-in short-circuit protection detection output function
• Built-in soft-star t circuit independent of loads
• Built-in totem-pole type output for Nch MOS FET
• Package : TSSOP-8P (Thickness 1.1 mm Max)

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PACKAGE

8-pin plastic TSSOP

(FPT-8P-M05)

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Summary

Page 2 - PIN ASSIGNMENT

MB39A105 2 ■ ■ ■ ■ PIN ASSIGNMENT (TOP VIEW) (FPT-8P-M05) − INE CSCP VCC SCPOD 1 2 3 4 FB RT GND OUT 8 7 6 5

Page 3 - PIN DESCRIPTION; Symbol

MB39A105 3 ■ ■ ■ ■ PIN DESCRIPTION Pin No. Symbol I/O Descriptions 1 − INE I Error amplifiers (Error Amp) inverted input terminal 2 CSCP  Timer-latch short-circuit protection capacitor connection terminal 3 VCC  Power supply terminal 4 SCPOD O Open drain output terminal for short-circuit protectio...

Page 4 - BLOCK DIAGRAM

MB39A105 4 ■ ■ ■ ■ BLOCK DIAGRAM +− −+ + + − +− 1 8 2 − INE FB CSCP 7 RT 6 5 GND OUT 4 3 SCPOD VCC VREF VREF Error Amp SCPComp. PWMComp. Drive Nch I O = 400 mA at VCC = 3.3 V (0.5 V ± 1%) ± 10% (1.0 V) UVLO OSC S Q R (0.9 V) (0.7 V) (0.3 V) bias RT Current VREF Power ON/OFF CTL VREF(1.27 V) L : UVLO...

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