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Compact design saves valuable board space
Dual-Output Step-Down Converter
BD93291EFJ
Dual-output DC/DC converter
with built-in MOSFET
電源
DEGITAL CATV
The BD93291EFJ integrates 2 synchronous rectification buck DC/DC converters
in a compact 8-pin package for increased space savings. In addition, high
efficiency operation is ensured throughout the entire load range, setting new
standards for power consumption.
Space-saving
Dual-output design in a
single-output form factor
3
Power Conversion Efficiency
Parameter
High Voltage (VOUT1)
Low Voltage (VOUT2)
Input Voltage Range
8.0V to 26V
Output Voltage Range
5.0V±1.5%
0.8V to 4.0V
-
0.8V±1.5%
2.5A
1.5A
300kHz to 600kHz
1.5MHz to 2.5MHz
Output Current
Switching Frequency
MOSFET ON Resistance
175mΩ / 175mΩ (typ.)
(High Side) (Low Side)
Operating Temp. Range
5.0V (V
1 output voltage used)
OUT
• Overcurrent protection (OCP)
• Undervoltage lock out (UVLO)
3
H Reg
adjusts the ON time of the High Side
voltage
recovery
faster
output
during
output
10
100
1000
TM
70
50
Improved
voltage drops due to sudden load
changes.
High-speed load response
Conventional Product
(No Light Load Mode)
10
100
IOUT2 [mA]
High efficiency
across the entire
load range
Conditions:
VIN=5.0V
VOUT=3.3V
L=2.2μH
1000
10000
Applications
Chipset
operating
voltage range
Improved
BD93291EFJ
(With Light Load Mode)
80
60
Control
Output
Voltage
Conventional
10000
Low Voltage Step-Down DC/DC (VOUT2)
100
0A
BD93291EFJ
FET, improving transient response
Conditions:
VIN=12V
VOUT=5.0V
L=22μH
IOUT1 [mA]
2.5A
Output
Current
Conventional Product
(No Light Load Mode)
90
for
stable output voltage. This method
for
70
50
• Thermal shutdown (TSD)
The BD93291EFJ utilizes ROHM’s
characteristics
80
250mΩ, 250mΩ (typ.)
H 3RegTM Control provides high-speed load response
H3RegTM control
High efficiency
across the entire
load range
60
(High Side) (Low Side)
Soft start function
proprietary
BD93291EFJ
(With Light Load Mode)
90
-40°C to +85°C
Multiple protection circuits
High Voltage Step-Down DC/DC (VOUT1)
100
Efficiency [%]
Reference Voltage
■
High power conversion
efficiency across the
entire load range
TM
Specifications
■
Energy efficient
H Reg ON time control ensures
stable output voltage
Efficiency [%]
HTSOP-J8
High-speed load response
Time
■ PC monitors, LCD TVs
■ Set-top boxes
■ DVD/Blu-ray players and recorders
■ Secondary,
POL power supplies
■ Broadband communication
Application Circuits
Conventional
BD93291EFJ
(1ch +1ch)
DC/DC + LDO ICs
(2ch)
Dual DC/DC IC (2-in-1)
DC/DC
19V→5V
19V→5V
C4
Enable
COMP
FB
BST
VIN
SW
GND
VOUT1
C1
C2
L1
H3RegTM
VOUT
4
VOUT1
C3
1
SWL
3
2
FBL
2
Space
saving
design
3
GND
1
L1
SW
R1
4
BST
5
EN
6
C2
C1
VIN
7
EN
R2
8
VIN
Enable
VIN
R3
SS
C5
5
6
7
8
C3
C6
L2
High-speed
load response
C4
VOUT2
R1
R2
C5
LDO
VOUT
VIN
C6
VOUT2
5.0V→3.3V
C7
GND
Switching efficiency
Increased 28%
5.0V→3.3V
LDO
(19V→3.3V)
Large heat loss
DC/DC Converter Lineup
Evaluation Board
Switching Regulators
Built-in FET
(Converters)
Single Output
Buck Type
Boost Type
Boost-Buck Type
Dual Output
External FET
(Controllers)
Single Output
Buck Type
Boost/Neg. V. Type
Buck Type
Boost Type
Boost/Neg. V. Type
Dual Output
Buck Type
Boost/Neg. V./Buck
Type
The content specified in this document is correct as of October 1st, 2013.
[O_023] Catalog No.56O6735E 10.2013 ROHM © 3')
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