Fujitsu MB3788 - Manual
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Table of Contents:
- Page 2 – • Output circuit; PIN ASSIGNMENT
- Page 3 – PIN DESCRIPTION; Pin name
- Page 4 – BLOCK DIAGRAM
- Page 5 – FUNCTIONAL DESCRIPTION; Major Functions; How to Set Output Current.; Channel Control Function; Voltage level at CTL pin
- Page 6 – Protection Functions; How to Set Time Constant for Timer & Latch-
- Page 8 – ELECTICAL CHARACTERISTICS
- Page 10 – STANDARD CHARACTERISTIC CURVES
- Page 12 – HOW TO SET OUTPUT VOLTAGE; Note: Set the output voltage in the positive range (V
- Page 13 – HOW TO SET OUTPUT CURRENT; • The OFF current time constant is proportional to the value of C; Fig.1 Output Circuit Diagram
- Page 15 – PROCESSING WITHOUT USING SCP PIN; Fig. 6 Processing without using SCP Pin
- Page 17 – φφφφ; Characteristic Measurement Diagram
- Page 18 – APPLICATION CIRCUIT
- Page 19 – NOTES ON USE; • Take measures against static electricity.; ORDERING INFORMATION; Part number
- Page 20 – PACKAGE DIMENSION; Each side
- Page 21 – FUJITSU LIMITED; FUJITSU LIMITED Printed in Japan
DS04-27209-3E
FUJITSU SEMICONDUCTOR
DATA SHEET
ASSP
SWITCHING REGULATOR
CONTROLLER
MB3788
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DESCRIPTION
The MB3788 is a dual-channel PWM-type switching regulator controller; it incorporates a reference voltage.
The MB3788 has a PWM circuit and an output circuit as well as a reference voltage power supply with a voltage
accuracy of
±
1%. The maximum operating frequency is 1 MHz. It is designed for a voltage-drop output switching
regulator suitable for a logic power supply or speed control of a DC motor.
The MB3788 is compatible with all master ICs producing triangular waves, saw-tooth waves and sine waves with
an amplitude of 1.3 V to 1.9 V.
It can be used in high-performance portable equipment such as a video camcorder or notebook personal computer
(word processor).
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FEATURES
• Wide operating power supply voltage range: 3.6 V to 18 V
• Low power dissipation
• Operating: 1.9 mA (standard)
Standby: 10
µ
A Max
(Continued)
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PACKAGE
This device contains circuitry to protect the inputs against damage due to high static voltages or electric fields. However, it is
advised that normal precautions be taken to avoid application of any voltage higher than maximum rated voltages to this high
impedance circuit.
24-pin Plastic SSOP
(FPT-24P-M03)
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Summary
MB3788 2 (Continued) • High-frequency operation: 100 kHz to 1 MHz• On-chip timer and latch-type short-circuit detection circuit• Wide error amplifier input voltage range: -0.2 V to V CC - 1.8 V • On-chip high-accuracy reference voltage circuit: 2.50 V ± 1% • Output circuit PNP transistor drive outpu...
MB3788 3 ■ ■ ■ ■ PIN DESCRIPTION Note: The alphabetic characters in parenthesis above indicate the following input pins. (C): Comparator(E): Error amplifier Pin No. Pin name I/O Descriptions Channel 1 2 OUT1 O Channel 1 push-pull type output 3 VE1 I Channel 1 output current setting 4 Ca1 — Channel 1...
MB3788 4 ■ ■ ■ ■ BLOCK DIAGRAM 24 Channel 1 -IN1 (E) FB1 -IN1 (C) +IN1 (E) 1 2 5 4 Ca1 V CC (out) OUT1 Cb1 11 13 14 3 CTL2 V CC CTL1 VE1 10 12 GND -IN(PWM) SCP V REF 1.9 V 1.3 V + - + - + - 1.5 V 0.6 V Error amplifier 1 Comparator 1 PWM comparator 1 OFF current setting 23 21 20 22 Channel 2 -IN2 (E)...
