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PDF BD9535MUV Data sheet ( Hoja de datos )

Número de pieza BD9535MUV
Descripción Switching Regulator
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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No Preview Available ! BD9535MUV Hoja de datos, Descripción, Manual

High Performance Regulators for PCs
Switching Regulator
for DDR-SDRAM Cores
BD9535MUV
No.10030EBT34
Description
BD9535MUV is a 2ch switching regulator controller with high output current which can achieve low output voltage (0.7V
2.0V) from a wide input voltage range (4.5V25V). High efficiency for the switching regulator can be realized by utilizing an
external N-MOSFET power transistor. A new technology called H3RegTM is a Rohm proprietary control method to realize
ultra high transient response against load change. SLLMTM (Simple Light Load Mode) technology is also integrated to
improve efficiency in light load mode, providing high efficiency over a wide load range. For the soft start/stop function,
variable frequency function, short circuit protection function with timer latch, and tracking function are all built in. This 2ch
switching regulator is specially designed for Chipset and Front Side Bus.
Features
1) 2ch H3REGTM Switching Regulator Controller
2) Light Load Mode and Continuous Mode Changeable
3) Thermal Shut Down (TSD), Under Voltage LockOut (UVLO),
Over Current (detect the peak current) Protection (OCP), Over Voltage Protection (OVP),
Short circuit protection with built-in timer-latch
4) Soft start function to minimize rush current during startup
5) Switching Frequency Variable (f=200KHz600kHz)
6) VQFN032V5050 package
7) Built-in Power good circuit
8) Adjustable to chip set spec by tracking function
Applications
Laptop PC, Desktop PC, LCD-TV, Digital Components
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
1/21
2010.07 - Rev.B

1 page




BD9535MUV pdf
BD9535MUV
Block Diagram
VIN
VCC
VREG SS1
Technical Note
EN1
REF1
EN2
REF2
Reference
Block
VREF
VIN
SLLM1
UVLO
2.5VReg
2.5V
BEN
SS
Soft Start/Stop Block
EN1
REF × 0.7
SS× 0.7
Is -1
Delay SCP
FS H3Reg
Controller
Block
SS
IS -1
Thermal TSD
+
+
-
UVLO
ILIM
EN2
R Q SLLM
S
SLLM1
Current Limit
ILIM
+
-
Driver
Circuit
OVP1
Protection
SCP
TSD
VCC
Reference
Block
VREF
VIN
UVLO
Is -1
POWER OVP1
Is-2 GOOD
OVP2
SLLM2
VIN
REF × 0.7
SS × 0.7
Is -2
SCP
Delay
H3Reg
Controller
Block
SS
IS-2
+
+
-
UVLO
ILIM
SCP
TSD
SS
BEN
Soft Start/StopBlock
R Q SLLM
S
ILIM
SLLM2
Current Limit
+
-
Driver
Circuit
VDD
OVP2
GND
FS
ILIM2
IS+2 IS-2
BOOT1
HG1
SW1
V DD
LG1
PGND1
CE1
Is -
Is+1
ILIM1
PGOOD1
PGOOD2
SS2
BOOT2
HG2
SW2
LG2
PGND2
CE2
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
5/21
2010.07 - Rev.B

5 Page





BD9535MUV arduino
BD9535MUV
Technical Note
Explanation of Operation
The BD9535MUV is a 2ch synchronous buck regulator controller incorporating ROHM’s proprietary H3REGTM CONTROLLA
control system. When VOUT drops due to a rapid load change, the system quickly restores VOUT by extending the TON
time interval. Thus, it serves to improve the regulator’s transient response. Activating the Light Load Mode will also exercise
Simple Light Load Mode (SLLMTM) control when the load is light, to further increase efficiency.
H3RegTM control
(Normal operation)
Is-(VOUT)
REF
HG
When VOUT falls to a threshold voltage (REF), the drop is
detected, activating the H3REGTM CONTROLLA system.
REF 1
tON= VIN × f [sec]・・・(1)
HG output is determined by the formula above.
LG
(VOUT drops due to a rapid load change)
Is-(VOUT)
REF
Io tON+α
HG
LG
When VOUT drops due to a rapid load change, and the
voltage remains below REF after the programmed tON time
interval has elapsed, the system quickly restores VOUT by
extending the tON time, improving the transient response.
Is-(VOUT)
REF
HG
LG
In SLLM (SLLM=0V), SLLM function is operated when LG
pin is OFF and the coil current is lower than 0A
(the current goes from VOUT to SW). And it stops to output
next HG.
When VOUT goes lower than REF voltage again, the status
of HG is ON.
0A
REF
Is-(VOUT)
EN
VIN
H3RegTM
CONTROLLA
VCC
4V
RQ
S
VIN
SLLMTM
Driver
Circuit
VOUT
EN
02.3V
2.33.8V
4.25.5V
Output
OFF
ON
ON
Operating mode
-
Forced continuous mode
SLLMTM
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
11/21
2010.07 - Rev.B

11 Page







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