BD9540EFV Datasheet, PDF (1/18 Pages) Rohm – 2ch Switching Regulators for Desktop PC

Hi-performance Regulator IC Series for PCs
2ch Switching Regulators
for Desktop PC
BD9540EFV
No.09030EBT07
●Description
BD9540EFV is a 2ch switching regulator synchronous controller that can generate low output voltages (0.75V to 5.5V). High
efficiency for the switching regulator can be achieved due to its external N-MOSFET power transistor. The IC also
incorporates a new technology called H³Reg^TM, a Rohm proprietary control method which facilitates ultra-high transient
response against changes in load. For protection and ease of use, the IC also incorporates soft start, and short circuit
protection with timer latch functions. This switching regulator is designed for DRAM and power supplies for graphics chips.
●Features
1) 2ch H³Reg^TM DC/DC converter synchronous controller
2) Thermal Shut Down (TSD), Under-Voltage Lock-Out (UVLO),
Adjustable Over Current Protection (OCP) : detected Low side FET Ron, Over Voltage Protection (OVP),
Short Circuit Protection (SCP) built-in
3) Soft start function to minimize rush current during startup
4) HTSSOP-B28 package
5) Built-in 5V power supply for FET driver
6) Integrated bootstrap diode
●Applications
LCD-TV, Game Consoles, Desktop PCs
●Maximum Absolute Ratings (Ta=25℃)
Parameter
Input Voltage
BOOT Voltage
BOOT-SW Voltage
HG-SW Voltage
Symbol
VIN
BOOT1,BOOT2
BOOT1-SW1, BOOT2-SW2
HG1-SW1, HG2-SW2
Limit
24^*1
30^*1
7^*1
7^*1
LG Voltage
Output Voltage
LG1, LG2
VOUT1, VOUT2
5VReg
7^*1
Output Feedback Voltage
5VReg Voltage
FB1, FB2
5VReg
5VReg
7^*1
Current Limit Setting Voltage
Logic Input Voltage 1
Logic Input Voltage 2
Power dissipation 1
Power dissipation 2
Power dissipation 3
Power dissipation 4
ILIM1, ILIM2
EN1, EN2
CTL1, CTL2
Pd1
Pd2
Pd3
Pd4
5VReg
24^*1
7^*1
1.45^*2
1.85^*3
3.30^*4
4.70^*5
Operating Temperature Range
Topr
-20～+100
Storage Temperature Range
Tstg
-55～+150
Junction Temperature
Tjmax
+150
*1 Not to exceed Pd.
*2 Reduced by 11.6mW for each increase in Ta of 1℃ over 25℃
(when mounted on a board 70.0mm×70mm×1.6mm Glass-epoxy PCB, 1layer, no copper foil area.)
*3 Reduced by 14.8mW for increase in Ta of 1℃ over 25℃.
(when mounted on a board 70.0mm×70mm×1.6mm Glass-epoxy PCB, 2layers, copper foil area : 15mm×15mm.)
*4 Reduced by 26.4mW for increase in Ta of 1℃ over 25℃.
(when mounted on a board 70.0mm×70mm×1.6mm Glass-epoxy PCB, 2layers, copper foil area : 70mm×70mm.)
*5 Reduced by 37.6mW for increase in Ta of 1℃ over 25℃.
(when mounted on a board 70.0mm×70mm×1.6mm Glass-epoxy PCB, 4layers, copper foil area : 70mm×70mm.)
Unit
V
V
V
V
V
V
V
V
V
V
V
W
W
W
W
℃
℃
℃
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2009.04 - Rev.B