Document
High Performance Regulators for PCs
2ch Switching Regulator for Desktop PC
BD9536FV
No.10030EAT35
●Description BD9536FV is a 2ch switching regulator controller that can generate low output voltages (0.7V to 5.5V) from a wide input voltage range (7.5V to 15V). High efficiency for the switching regulator can be achieved due to its internal N-MOSFET power transistor. The IC also incorporates a new technology called H3RegTM, 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, variable frequency, and short circuit protection with timer latch functions. This switching regulator is specially designed for DRAM and power supplies for graphics chips.
●Features 1) 2ch H3RegTM DC/DC converter controller 2) Thermal Shut down (TSD), Under-Voltage Lock-Out (UVLO), Adjustable Over Current Protection (OCP): detected FET Ron, Over Voltage Protection (OVP), Short Circuit Protection (SCP) built-in 3) Soft start function to minimize rush current during startup 4) Adjustable switching frequency (f = 200 kHz – 600 kHz) 5) SSOP-B28 Package 6) Built-in 5V power supply for FET driver 7) Integrated bootstrap diode
●Applications LCD, Game Consoles, Desktop PCs
www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved.
1/18
2010.07 - Rev.A
BD9536FV
Technical Note
●Maximum Absolute Ratings (Ta=25℃) Parameter
Symbol
Input Voltage
VIN
BOOT Voltage
BOOT1/2
BOOT-SW Voltage
BOOT1-SW1, BOOT2-SW2
HG-SW Voltage
HG1-SW1, HG2-SW2
Ratings 16 *1 23 *1 7 *1 7 *1
Unit V V V V
LG Voltage Output Voltage
LG1/2 VOUT1/2
5VReg 7 *1
V V
Output Feedback Voltage
FB1/2
5VReg
V
FS Voltage 5VReg Voltage
FS1/2 5VReg
5VReg 7 *1
V V
Current Limit Setting Voltage Logic Input Voltage Power dissipation 1 Power dissipation 2
ILIM1/2 EN1/2, CTL1/2
Pd1 Pd2
5VReg 7 *1 0.8 *2
1.06 *3
V V W W
Operating Temperature Range
Topr
-20~+100
℃
Storage Temperature Range
Tstg
-55~+150
℃
Junction Temperature
Tjmax
+150
*1 Not to exceed Pd. *2 Reduced by 6.4mW for each increase in Ta of 1℃ over 25℃ (when not mounted on a heat radiation board ) *3 Reduced by 8.5mW for increase in Ta of 1℃ over 25℃. (when mounted on a board 70.0mm×70mm×1.6mm Glass-epoxy PCB.)
℃
●Operating Conditions (Ta=25℃) Parameter
Symbol
Input voltage
VIN
BOOT voltage
BOOT1/2
SW Voltage
SW1/2
BOOT-SW voltage
BOOT1-SW1, BOOT2-SW2
Logic Input Voltage
EN1/2, CTL1/2
Output Voltage
VOUT1/2
MIN ON Time
tonmin
★ This product should not be used in a radioactive environment.
Ratings Min. Max. 7.5 15 4.5 20 -0.7 15 4.5 5.5
0 5.5 0.7 5.5
- 100
Unit V V V V V V ns
www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved.
2/18
2010.07 - Rev.A
BD9536FV
Technical Note
●Electrical Characteristics (Unless otherwise noted, Ta=25℃, VCC=5V, VIN=12V, VEN1=VEN2=3V, VOUT1=VOUT2=1.8V, RFS=75kΩ)
Parameter
Symbol
Limits Unit
Min. Typ. Max.
Condition
[General]
VIN Bias Current
IIN - 1.6 2.5 mA
VIN Standby Current
IIN_stb - 0 10 µA VEN1=VEN2=0V
EN Low Voltage 1,2
VEN_low1,2
GND
-
0.3 V
EN High Voltage 1,2
VEN_high1,2
2.2
-
5.5 V
EN Bias Current 1,2
IEN1,2
- 14 20 µA
[5V Linear Regulator]
5VReg Standby Voltage 5VReg Output Voltage Maximum Current
5Vreg_stb
-
- 0.1 V VEN1=VEN2=0V
5VReg
4.8
5.0
5.2
V
VIN=7.5V to 15V Ireg=0mA to 10mA
IReg 50 -
- mA
[Under-Voltage Lock-Out]
5VReg Threshold Voltage
5VReg_UVLO
3.75
4.20
4.65 V 5VReg:Sweep up
5VReg Hysteresis Voltage
d5VReg_UVLO
100
160
220 mV 5VReg:Sweep down
[OVP Block]
FB Threshold Voltage 1,2 [H3REGTM Control Block]
FB_OVP1,2
0.75
0.85
0.95 V
ON Time1
ton1 480 600 720 ns RFS1=75kΩ
MAX ON Time 1
Tonmax1
3.0
4.0
5.0 µs
MIN OFF Time 1
Toffmin1 600 900
- ns
ON Time 2
Ton2
480 600 720 ns RFS2=75kΩ
MAX ON Time 2
Tonmax2
3.0
4.0
5.0 µs
MIN OFF Time 2
Toffmin2 600 900
- ns
[FET Block]
HG High side ON Resistance 1,2 HG Low side ON Resistance 1,2 LG High side ON Resistance 1,2 LG Low side ON Resistance 1,2
RHGhon1,2 RHGlon1,2 RLGhon1,2 RLGlon1,2
-
3.0 6.0 Ω 2.0 4.0 Ω 2.0 4.0 Ω 0.5 1.0 Ω
[Over Current Protection Block]
Current Limit Threshold Voltage1_1,2 Reverse Current Limit Threshold Voltage 1_1,2
Vilim11,2
80 100 120 mV RILIM=100k
VReIlim11,2 80 100 120 mV RILIM=100k
[Output Voltage Detection Block]
FB1 threshold Voltage 1
FB1-1
0.615
0.625
0.635
V CTL1/2=0V or 3V
FB1 threshold Voltage 2
FB1-2
0.640
0.650
0.660
V CTL1=0V, CTL2=3V
FB1 threshold Voltage 3
FB1-3
0.590
0.600
0.610
V CTL1=3V, CTL2=0V
FB2 threshold Voltage
FB2
0.640
0.650
0.660
V
CTL Low Voltage 1,2
VCTL_low1,2
GND
-
0.5 V
CTL High Voltage 1,2
VCTL_high1,2 VCC-0.5
-
VCC
V
FB1/2 Input Current
IFB
-1 -
1 µA
VOUT Discharge Current
IVOUT
5 10 - mA VOUT=1V, EN=0V
[SCP Block] Threshold Voltage 1,2 Charge Current (SCP)
Vthscp1,2 ISCP
REF1/2× REF1/2× REF1/2× 0.70 0.80 0.90
V
1 2 3 µA
Charge Current (OVP)
IOVP 4 8 12 µA
Delay Setting .