BD9731KV

Features:

1) Can operate both external transistors of Bipolar and MOS.
(Base current can be set by resistance.)
2) Built-in output shutdown circuit (Timer latch) when overloaded.
3) Channel 1, and 5 can externally set the reference voltage.
4) Channel 1, 4, and 5 can control independently ON/OFF.
5) All channels have dead time control.




Application

Digital still camera, Portable DVD player, W-CDMA, PDA, Digital movie camera




Specifications

Parameter	Symbol	Limits	Unit
Supply voltage	VCC	36	V
Power dissipation	Pd	400 *1	mW
		900 *2
Operating temperature range	Topr	-20 to +85	°C
Storage temperature range	Tstg	-55 to +125	°C

*Derating : 4.0mW/ for operation above Ta=25 (Only IC unit)
*PCB (70mmx70mm, t=1.6mm) glass epoxy mounting. Derating : 9.0mW/ for operation above Ta=25




Description

The BD9731KV is designed as a PWM switching regulator controller IC. The 5-channel (4 channel for step-up, and 1 channel for step-down) switching regulator controllers are integrated into a VQFP48 package. This IC can operate both Bipolar and MOS transistor. Triangle wave oscillator, reference voltage, PWM comparator, CMOS type driver, and short protection circuit are integrated.

The BD9731KV has five features. (1)Can operate both external transistors of Bipolar and MOS (Base current can be set by resistance). (2)Built-in output shutdown circuit (Timer latch) when overloaded. (3)Channel 1, and 5 can externally set the reference voltage. (4)Channel 1, 4, and 5 can control independently ON/OFF. (5)All channels have dead time control. Those are all the main features.

Some absolute maximum ratings of BD9731KV have been concluded into several points as follow. (1)Its maximum applied voltage would be from -0.3V to 12V. (2)Its power dissipation would be 400mW. (3)Its operating temperature range would be from -20°C to 85°C. (4)Its storage temperature range would be from -55°C to 125°C. It should be noted that stresses above those listed in absolute maximum ratings may cause permanent damage to device.

Also some electrical characteristics of BD9731KV are concluded as follow. (1)Its circuit current at standby-by would be max 10uA. (2)Its circuit current at operating would be typ 4.5mA and max 9.5mA. (3)Its output voltage would be min 1.485V and typ 1.5V and max 1.515V. (4)Its output voltage REGA would be min 2.4V and typ 2.5V and max 2.6V. (5)Its CH1 to CH5 threshold voltage would be min 1.425V and typ 1.5V and max 1.575V. (6)Its SCP pin detection circuit would be min 0.9V and typ 1.0V and max 1.1V. (7)Its oscillating frequency would be min 0.179MHz and typ 0.2MHz and max 0.221MHz. And so on. If you have any question or suggestion or want to know more information please contact us for details. Thank you!

BD9731KV is a PWM switching regulator controller IC.The 5-channel (4 channel for step-up, and 1 channel for step-down) switching regulator controllers are integrated into a VQFP48 package. This IC can operate both Bipolar and MOS transistor. Triangle wave oscillator, reference voltage, PWM comparator, CMOS type driver, and short protection circuit are integrated.