MP3212 MPS, MP3212 Datasheet - Page 9

• Manufacturer Part Number: MP3212
• Description: 1.3a, 1mhz Step-up Regulator With Integrated Input Disconnect Switch
• Manufacturer: MPS

MP3212–1.3A, 1MHz, STEP-UP REGULATOR WITH INTEGRATED INPUT DISCONNECT SWITHCH
Maximum Duty Cycle
The maximum duty cycle Dmax will determine
the maximum output voltage that the MP3212
can provide. The maximum duty cycle is defined
by the minimum off time of the switch.
DMAX = 1 – tOFF*Fosc
PFM Mode
During the light load condition, the MP3212
automatically enters pulse frequency modulation
(PFM) mode. In PFM mode, most of the internal
circuitry is turned off, only keeping alive the
active circuitry required to regulate the output
voltage.
Isolation From V
(SHDN=High)
IN
To prevent the battery from discharging the
MP3212 is automatically disconnected from the
battery when put in shutdown mode. The
MP3212 has an internal, low resistance isolation
FET that opens when the SHDN pin is pulled
high.
Average Current Monitor at the Disconnect
Switch
If the average current is above the over current
set value VOI, the isolation switch is open, the
boost
switch
is
opened,
MP3212
then
immediately goes into start-up mode.
MP3212 Rev. 0.9
www.MonolithicPower.com
9
3/21/2008
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