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Featured Products
High-Speed Load Response
Buck DC/DC Converters
BD958x1 Series
ROHM’s 12V-compatible DC/DC converters
integrate a power MOSFET and provides
high-speed load response via H3RegTM technology
The BD958x1 series includes pin-compatible models from 2A to 6A, making it
possible to select the ideal product based on system specifications. In addition,
fixed On Time control enables high-speed load response, eliminating the need
for phase compensation.
High-Speed
Load Response
Space-saving
3x3mm form factor
Greater
than 90%
VQFN016V3030
High-speed load response via H3RegTMcontrol
Lineup
Input Voltage (V)
Output Current (A)
BD95821MUV
2.0 (Max.)
BD95831MUV
3.0 (Max.)
BD95841MUV
DEGITAL CATV
Compact Size
High Power
Conversion Efficiency
Proprietary
H3RegTM
technology
Part No.
電源
7.5 to 15.0
BD95861MUV
4.0 (Max.)
Package
VQFN016V3030
6.0 (Max.)
H3RegTM Control
The BD958x1 series utilizes ROHM’s
proprietary H3RegTM control method
for stable output voltage.
With H3RegTM, the ON time of the high
side FET is controlled when the
voltage drops due to sudden load
changes, speeding up output voltage
recovery and improving transient
characteristics.
6A
Output
Current
0A
BD958x1
Improved
Output
Voltage
Conventional
Improved
Chipset
operating voltage
range
High-speed load response
Time
Features and Specifications
Input Voltage Range
: 7.5V to 15V
Output Voltage Range
: 0.8V to 5.5V
Reference Voltage
: 0.8V±1.5%
Switching Frequency
: 500kHz to 800kHz
MOSFET ON Resistance
: 85mΩ, 55mΩ(Typ.)
Operating Temp. Range
: -20°C to +100°C
No phase compensation needed
Synchronous rectification eliminates the need for
an external diode
■ Multiple protection circuits
• Over Current Protection (OCP) • Short Circuit Protection (SCP)
• Thermal Shut Down (TSD)
• Under Voltage Lock Out (UVLO)
• Over Voltage Protection (OVP)
■ Soft Start function
■ Power Good output
Power Efficiency Characteristics (BD95831MUV)
VOUT = 3.3V
100
VOUT = 5.0V
90
80
Efficiency (%)
■
■
■
■
■
■
■
■
Power conversion
efficiency
70
60
VOUT = 1.2V
Greater than
50
40
90%
Condition
VIN=12V
L=3.3µH
30
20
10
0
0
1
Iout (A)
2
3
Applications
■ LCD TVs ■ Set top boxes ■ Gaming equipment
■ DVD / Blu-ray players and recorders
■ Secondary / POL power supplies
Application Circuit
VREG
PGOOD
R1
EN
100kΩ
R4
R3
12
GND
GND
GND
C6 VREG_C
VREG
EN
10
9
13
8
BOOT
14
7
SW
0.022µF
TEST
11
PGOOD
VOUT
680Ω 24kΩ
FB
4.7kΩ
R2
Thermal Pad
(Shorted to GND)
15
6
C5
BOOT_C
0.01µF
SW
GND
PGND
10µF
2
L1
SW
3.3µH
3
4
PGND
1
VIN
C2
CIN
10µF
VIN
C1
CIN
5
16
PGND
VIN
VIN
12V
VOUT
5.0V
C3
COUT
22µF
PGND
PGND
PGND
Reference
Designator
Manufacture
Part Number
Manufacture
Configuration
(mm)
ROHM
VQFN016V3030
GRM31CR61E106KA12
MURATA
3216
16V, X5R, ±20%
GRM31CR61C226ME15
MURATA
3216
0.01µF
25V, B, ±10%
GRM155B11E103KA01
MURATA
1005
Ceramic
0.022µF
Capacitor
16V, B, ±10%
GRM155B11C223KA01
MURATA
1005
±20%, 6.1A(L=–20%),
DCR=28mΩ Max.
FDSD0630-H-3R3M
TOKO
7066
±20%, 7.3A(L=–20%),
DCR=29.7mΩ Max.
SPM6530T-3R3M
TDK-EPC
7165
±30%, 4.0A(L=–30%),
DCR=35.1mΩ Max.
NRS5040T 3R3NMGJ
TAIYO YUDEN
4949
±20%, 5.5A(L=–30%),
DCR=28.6mΩ Max.
XAL4030-332ME
COILCRAFT
4040
Type
Value
Description
IC
-
Buck DC/DC Converter, 3A
BD95831MUV
C1, C2
Ceramic
Capacitor
10µF
25V, X5R, ±10%
C3, C4
Ceramic
Capacitor
22µF
C5
Ceramic
Capacitor
C6
IC
L1
Inductor
3.3µH
C4
COUT
R1
Resistor
100kΩ
1/16W, 50V, 5%
MCR01MZPJ104
ROHM
1005
R2
Resistor
24kΩ
1/16W, 50V, 1%
MCR01MZPF2402
ROHM
1005
R3
Resistor
680Ω
1/16W, 50V, 5%
MCR01MZPJ681
ROHM
1005
R4
Resistor
4.7kΩ
1/16W, 50V, 1%
MCR01MZPF4701
ROHM
1005
Evaluation Board
of May 1st, 2013.
56O6682E 05.2013
PDF
22µF
PGND
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