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Fujitsu Media Devices |
FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27237-2E
ASSP for Power Supply Applications
(DC/DC converter for DSC/camcorder)
5 ch DC/DC Converter IC with
Synchronous Rectification
MB39A108
■ DESCRIPTION
The MB39A108 is 5-channel DC/DC converter IC using pulse width modulation (PWM), and is suitable for up
conversion, down conversion, and up/down conversion. The MB39A108 is built in 5 channels into TSSOP-38P/
BCC-40P package and operates at 2 MHz maximum. Each channel can be controlled with soft-start.
The MB39A108 is suitable for power supply of high performance portable instruments such as DSC.
■ FEATURES
• Supports for down-conversion with synchronous rectification (CH1)
• Supports for down-conversion and up/down Zeta conversion (CH2, CH3)
• Supports for up-conversion and up/down Sepic conversion (CH4, CH5)
• Low voltage start-up (CH4, CH5) : 1.7 V
• Power supply voltage range : 2.5 V to 11 V
• Reference voltage : 2.0 V ± 1%
• Error amplifier threshold voltage : 1.00 V ± 1% (CH1), 1.23 V ± 1% (CH2 to CH5)
• Oscillation frequency range : 200 kHz to 2.0 MHz
www.DataSh•eeSt4taUn.cdobmy current : 0 µA (Typ)
• Built-in soft-start circuit independent of loads
• Built-in totem-pole type output for MOS FET
• Short-circuit detection capability by external signal ( − INS terminal)
• Two types of package (TSSOP-38 pin : 1 type, BCC-40 pin : 1 type)
■ APPLICATIONS
• Digital still camera (DSC)
• Digital video camera (DVC)
• Surveillance camera
etc.
Copyright©2005-2006 FUJITSU LIMITED All rights reserved
MB39A108
■ PIN ASSIGNMENT
www.DataSheet4U.com
CS2
−INE2
FB2
DTC2
VCC
CTL
CTL3
CTL4
CTL5
−INS
VREF
RT
CT
GND
CSCP
DTC3
FB3
−INE3
CS3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
(TOP VIEW)
(FPT-38P-M03)
38 CS1
37 −INE1
36 FB1
35 VCCO
34 OUT1-1
33 OUT1-2
32 OUT2
31 OUT3
30 OUT4
29 OUT5
28 GNDO
27 CS5
26 −INE5
25 FB5
24 DTC5
23 DTC4
22 FB4
21 −INE4
20 CS4
(Continued)
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