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Featured Products
Space-Saving Energy Efficient Secondary
Power Supplies for Automotive Systems
BD905xx Series
Reduce external parts
80%
90% efficiency
Light Load Mode utilized for greater energy savings
Improved thermal design cuts loss by 90%* compared with LDOs
External parts equivalent to 3-pin products for
HTSOP-J8
*ROHM July 2013 survey
Contributes to set miniaturization
Feedback resistors, phase compensation, and other
components are built in, making it easy to configure a
DC/DC power supply using few external parts.
In addition, the special heat dissipation design results
in significantly increased space savings during
mounting.
Co nve n t i o n a l
VIN
VIN
PVIN
20mm
20mm
BD905xx Series
Automotive-Grade
Secondary Power Supply
ICs
(Actual Size)
VOUT
SW
VIN
PGND
SS
FB
ITH
MODE
GND
B D 9 05x x S e r i e s
Part count
reduced by
80%
15
RT
External Parts: Lx1, Cx8, Rx6 piece
PVIN
VIN
EN
SW
VOUT
PGND
FB
GND MODE
External Parts: Lx1, Cx2
3
piece
Consi d e r a bly f ewe r ex t e r nal p a r t s
High efficiency across the entire range
100
90
High efficiency
even at
light loads
BD90535EFJ-C
Light Load MODE
90%
80
EFFICIENCY [%]
Synchronous rectification and Light Load Mode
ensures high efficiency operation (90% max.) across
the entire load range, providing the energy savings
required for today’s automotive applications.
70
60
High efficiency
with PWM mode
PWM MODE
50
40
30
20
VIN=3.3V
10
0
0.01
0.10
1.00
LOAD CURRENT [A]
External Dimensions
Block Diagram
EN
4.9±0.1
(MAX 5.25 include BURR)
(3.2)
PVIN
PWM
Comp.
OCP
R
Driver
Logic
Synchronous
rectification for
high efficiency
SW
SLOPE
OSC
+6°
4° -4°
8 7 6 5
3.9±0.1
ERROR
Amp.
1
S
2 3 4
1PIN MARK
S
SCP
1024cycle
FB
GND
0.08±0.08
UVLO
/TSD
0.85±0.05
1.0MAX
PGND
OSC
+0.05
0.17 -0.03
0.545
OVP
0.65±0.15
UVLO
(2.4)
SOFT
START
1.05±0.2
VIN
VREF
6.0±0.2
Phase
compensation
built in
1.27
+0.05
0.42-0.04
0.08 M
0.08 S
(Unit : mm)
MODE
Switching Regulator Family
General Purpose
Boost, Buck, Boost/Buck
Switching Regulators
1.75A/2A/4A
General Purpose ICs
Built-In FET Type
Automotive Grade
Secondary Power Supply ICs
Switching Regulators
External FET Type
Multi-Output Switching Regulators
Monolithic Power Supply Modules
2ch/1ch
Easily configure
high-power
power supply circuits
2ch Step-Down DC/DC Controllers, 2ch Step-Up/Down/Negative Voltage DC/DC Controllers,
2ch Step-Down DC/DC Converters, 3ch Step-Down DC/DC Converters
Ultra-Compact Monolithic Power Supply Modules
Automotive-Grade Secondary Power Supply IC Lineup
1ch 3A Output
No. of Outputs
Supply Voltage
(V)
Output Current
(A)
BD90532EFJ-C
1
2.69 to 5.5
3.0
BD90535EFJ-C
1
2.69 to 5.5
BD90538EFJ-C
1
2.69 to 5.5
Part No.
No. of Outputs
Supply Voltage
(V)
Output Current
(A)
BD90522EFJ-C
1
2.69 to 5.5
2.0
BD90525EFJ-C
1
2.69 to 5.5
2.0
BD90528EFJ-C
1
2.69 to 5.5
Part No.
No. of Outputs
BD90571EFJ-C
1
Part No.
1ch 2A Output
1ch 1A Output
Output Voltage Ref. Voltage
(V)
Accuracy (%)
Op. Temp.
(°C)
Op. Freq.
(kHz)
Freq.
Accuracy (%)
Oscillator
Package
1.2
±2.0
−40 to +125
2250
±20
Self-Oscillation
HTSOP-J8
3.0
1.5
±2.0
−40 to +125
2250
±20
Self-Oscillation
HTSOP-J8
3.0
1.8
±2.0
−40 to +125
2250
±20
Self-Oscillation
HTSOP-J8
Op. Temp.
(°C)
Op. Freq.
(kHz)
Freq.
Accuracy (%)
Oscillator
Package
1.2
±2.0
−40 to +125
2250
±20
Self-Oscillation
HTSOP-J8
1.5
±2.0
−40 to +125
2250
±20
Self-Oscillation
HTSOP-J8
2.0
1.8
±2.0
−40 to +125
2250
±20
Self-Oscillation
HTSOP-J8
Supply Voltage
(V)
Output Current
(A)
Output Voltage
(V)
Ref. Voltage
Accuracy (%)
Op. Temp.
(°C)
Op. Freq.
(kHz)
Freq.
Accuracy (%)
Oscillator
Package
2.69 to 5.5
1.0
1.2
±2.0
−40 to +125
2250
±20
Self-Oscillation
HTSOP-J8
Output Voltage Ref. Voltage
Accuracy (%)
(V)
The content specified in this document is correct as of July 1st, 2013.
56O6711E 07.2013
ROHM
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