Copyright©2011 FUJITSU SEMICONDUCTOR LIMITED All rights reserved
2011.12
FUJITSU SEMICONDUCTOR
DATA SHEET
DS405-00007-1v0-E
FUJITSU SEMICONDUCTOR CONFIDENTIAL
ASSP for Power Management Applications
2ch DC/DC converter IC
with PFM/ PWM synchronous rectification
MB39A214A
DESCRIPTION
MB39A214A is a N-ch/ N-ch synchronous rectification type 2ch Buck DC/DC converter IC equipped with
a bottom detection comparator for low output voltage ripple. It supports low on-duty operation to allow
stable output of low voltages when there is a large difference between input and output voltages. It also
allows the high switching frequency setting, enabling the downsized peripheral circuits and low-cost
configuration. MB39A214A realizes ultra-rapid response and high efficiency with built-in enhanced
protection features. It is most suitable for the power supply for ASIC or FPGA core, input/output devices, or
memory.
FEATURES
y High efficiency
y Frequency setting by internal preset function : 310 kHz, 620 kHz, 1 MHz
y High accuracy reference voltage :
± 0.7% (Ta = + 25 °C)
y V
IN
Input voltage range : 6 V to 28 V
y Output voltage setting range : 0.7 V to 5.3 V
y Possible to select the automatic PFM/PWM selection mode or PWM-fixed mode
y PAF frequency limitation function (Prohibit Audio Frequency) : > 30 kHz (Min)
y Built-in boost diode, external fly-back diode not required
y Built-in discharge FET
y Built-in over voltage protection function
y Built-in under voltage protection function
y Built-in over temperature protection function
y Built-in over current limitation function
y Soft-start circuit without load dependence
y Current sense resistor not required
y Built-in synchronous rectification type output steps for N-ch MOS FET
y Standby current : 0 µA (Typ)
y Package : TSSOP24 (4.4 mm°6.5 mm°1.2 mm [Max])
APPLICATIONS
y Digital TV
y Photocopiers
y STB
y BD, DVD players/recorders
y Projectors etc.
