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BD4911FM fiches techniques PDF

ROHM Semiconductor - Multifunction System Power Supply IC

Numéro de référence BD4911FM
Description Multifunction System Power Supply IC
Fabricant ROHM Semiconductor 
Logo ROHM Semiconductor 





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BD4911FM fiche technique
TECHNICAL NOTE
System Power Supply LSIs for use in automotive Electronics
Multifunction System
ESD
Resistance
Power Supply IC
Now available
(with Watchdog Timer)
BD4911FM
zDescription
The BD4911FM multiple-output system power supply features microcontroller output and is capable of operating at super-low
dark current levels. With a built-in reset, with a microcontroller delay, BATTERY/ACCESSORY voltage detection, and mute
function, WDT (Watch Dog Timer)function, the BD4911FM is ideal for car audio and satellite navigation systems.
zFeatures
1) Main regulator Vo1 can be switched between 5.0 V and 3.3 V output using the SEL input voltage, and can be used
with an external boost transistor.
Sub-regulator Vo2 generates 3.3 V output.
Both regulators feature an output current of 150 mA.
2) Built-in WDT reset; monitor time can be set with the CTW capacitor.
WDT operation can be switched on and off using INH input.
3) Circuit current during standby operation (WDT off): 100 µA (TYP)
4) Built-in reduced power detection circuits for Vo1 and Vo2 output
5) Built-in elevated output detection circuit for Vo1
6) The IC monitors the BuM voltage and outputs it to the BuDET1 and BuDET2 pins.
7) The IC monitors the ACCM voltage and outputs it to the ACCM pin when BuDET1 and BuDET2 are low.
8) Built-in mute circuit. Pulse width can be set with the CE capacitor.
9) Built-in power-on reset function for which RESET output can be set with the CTP capacitor.
10) Vo1 generates low-saturation voltage type PMOS output.
11) Built-in overcurrent protection circuit
12) Built-in overvoltage protection circuit
13) Built-in thermal shutdown circuit
14) The 28-pin HSOP-M28 package is ideal for space-saving designs.
zApplications
Car audio and satellite navigation systems
Ver.B Oct.2005

PagesPages 17
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