5-channel switching regulator controller
BD9731KV
Description
Dimension (Units : mm)
Features
Applications
01W038A
May, 2001
*Derating : 4.0mW/˚C for operation above Ta=25˚C (Only IC unit)
*PCB (70mmx70mm, t=1.6mm) glass epoxy mounting. Derating : 9.0mW/˚C for operation above Ta=25˚C
Power supply voltage VCC —2.8 11 V
Recommended Operating Conditions (Ta=25˚C)
Parameter Min. Max. UnitTyp.Symbol
Output current IOUT —— 30 mA
Oscillating frequency 100 700 kHz—fosc
Absolute Maximum Ratings (Ta=25˚C)
Maximum applied voltage
Power dissipation
Operating temperature range
Storage temperature range
Parameter Symbol Limits Unit
Vmax
Pd
Topr
Tstg
400
+85
+125
–20
–55
~
+12–0.3 ~
~
mW
˚C
˚C
V
*1
900
*2
VQFP48
1
.
4
2
5
–
0
.
1
0
.
1
0
0.2–0. 10.5
1 12
37
48
7
.
0
–
0
.
2
9
.
0
–
0
.
3
7.0–0.2
2536
24
13
9.0–0.3
0. 15–0. 1
0. 10
0
.
4
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.
Digital still camera, Portable DVD player, W-CDMA, PDA, Digital movie camera
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.