FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27235-2E
ASSP For Power Supply Applications
(General Purpose DC/DC Converter)
2-Channel DC/DC Converter IC
with Overcurrent Protection Symmetrical-Phase Type
MB39A106
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DESCRIPTION
The MB39A106 is a symmetrical-phase type of two-channel, DC/DC converter IC using pulse width modulation
(PWM) , incorporating an overcurrent protection circuit (requiring no current sense resistor) and an overvoltage
protection circuit. Providing high output driving capabilities, the MB39A106 is suitable for down-conversion.
The MB39A106 adopts both synchronous rectification to provide high efficiency and symmetrical phasing (two
anti-phase triangular waves) which contributes to making the input capacitor small.
The MB39A106 contains a Bootstrap diode resulting in a reduced number of components used. It also contains
a variety of protection features which output the protection status upon detection of an overvoltage or overcurrent
while reducing the number of external protective devices required.
The result is an ideal built-in power supply for driving products with high speed CPU’s such as home TV game
devices and notebook PC’s.
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FEATURES
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Built-in bootstrap diode
Built-in timer-latch overcurrent protection circuit (requiring no current sense resistor)
Built-in timer-latch overvoltage protection circuit
Synchronous rectification system providing high efficiency
Power supply voltage range: 6.5 V to 18 V
PWRGOOD terminals (open-drain) to output the protection status
Symmetrical-phase system reducing the input capacitor loss
Built-in channel control function
One type of package (TSSOP-30pin : 1 type)
Reference voltage: 3.5 V
±
1
%
Error amplifier threshold voltage: 1.23 V
±
1
%
(Ta
=
0
°C
to
+
85
°C)
Support for frequency setting using an external resistor (Frequency setting capacitor integrated)
Oscillation frequency range: 100 kHz to 500 kHz
Standby current : 0
µA
(Typ)
Built-in circuit for load-independent soft-start and discharge control
Built-in totem-pole output for N-ch MOS FET
One type of package (TSSOP-30 pin : 1 type)
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APPLICATION
• Home Video Game
• IP phone
• Printer
etc.
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FUJITSU [ FUJITSU COMPONENT LIMITED. ]
