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PDF BD9536FV Data sheet ( Hoja de datos )
| Número de pieza | BD9536FV | |
| Descripción | 2ch Switching Regulator | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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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
1 page  
BD9536FV
Technical Note
●Pin Configuration
CTL1 1
VOUT1 2
FB1 3
REF1 4
ILIM1 5
FS1 6
GND 7
SCP 8
FS2 9
ILIM2 10
REF2 11
FB2 12
VOUT2 13
CTL2 14
BD9536FV
28 EN1
27 BOOT1
26 HG1
25 SW1
24 LG1
23 PGND
22 VCC
21 VIN
20 5Vreg
19 LG2
18 SW2
17 HG2
16 BOOT2
15 EN2
●Pin Function
PIN PIN
No. name
1 CTL1
PIN Function
1ch Output Voltage Setting Control Pin 1
:See P13/17
2 VOUT1 Output Voltage Sence Pin 1
3 FB1 Output Voltage Feedback Pin 1
Reference Voltage Pin 1 /
4 REF1 Soft Start Time Setting Pin 1
(0.625V±25mV select) :See P13/17
5 ILIM1 1ch OCP Setting Pin
6 FS1 Switching Frequency Adjustable Pin 1
7 GND Sense GND
8
SCP
Timer Latch Delay time Setting Pin
for short circuit protection
9 FS2 Switching Frequency Adjustable Pin 2
10 ILIM2 2ch OCP Setting Pin
11
REF2
Reference Voltage Pin 2 /
Soft Start Time Setting Pin 2(0.65V)
12 FB2 Output Voltage Feedback Pin 2
13 VOUT2 Output Voltage Sense Pin 2
14
CTL2
1ch Output Voltage Setting Control Pin 2
:See P13/17
PIN PIN
No. name
PIN Function
15
EN2
Enable Input Pin 2
(0～0.3V:OFF, 2.2～5.5V:ON)
16 BOOT2 HG Driver Power Supply Pin 2
17 HG2 High side FET Gate Driver Pin 2
18 SW2 High side FET Source Pin 2
19 LG2 Low side FET Gate Driver Pin 2
20
5VReg
Reference Voltage Inside IC
(5V Voltage / always ON)
21 VIN Battery Voltage Sense Pin
22 VCC Power Supply Input Pin
23 PGND Power GND
24 LG1 Low side FET Gate Driver Pin 1
25 SW1 High side FET Source Pin 1
26 HG1 High side FET Gate Driver Pin 1
27 BOOT1 HG Driver Power Supply Pin 1
28
EN1
Enable Input Pin 1
(0～0.3V:OFF, 2.2～5.5V:ON)
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
5/18
2010.07 - Rev.A
5 Page 
BD9536FV
●Timing Chart
・Over current protection circuit
tON tON tON
HG
LG
Technical Note
During normal operation, when VOUT falls below REF,
HG switches high during for the period of time tON (P8).
tON However, if the current through the inductor exceeds the
ILIMIT threshold, HG will switch off.
After the MAX ON TIME period elapses, HG switches
high again if the output voltage is lower than the
specified voltage level, and if IL is lower than the ILIMIT
level.
IL
・Timer Latch Type Short Circuit Protection
FB
SCP
REF×0.8
TSCP
Delay setting voltage
1.2V
EN/UVLO
Short protection engages when output falls to or below
REF x 0.8. When the programmed time period elapses,
output is latched off to prevent damage to the IC. Output
voltage can be restored either by reconnecting the EN pin
or disabling UVLO. Short circuit protection time is
determined via formula (4) below.
Short protection time setting
Tscp= 1.2(V)×CSCP
2 µA(typ)
[sec] ・・・(4)
・Output Over Voltage Protection
VOUT
REF×1.2
HG
When output voltage rises to or above REF x 1.2, output
over-voltage protection engages after the set time TSCP/8
has elapsed. During this protection period, the low-side
FET opens completely for maximum reduction of output
voltage (LG = high, HG = low). Output voltage can be
restored either by reconnecting the EN pin or disabling
UVLO.
LG
SCP
Switching
Delay setting voltage
1.2V
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
11/18
2010.07 - Rev.A
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet BD9536FV.PDF ] | |
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