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Current Mode Step-DownRegulatorsfor point-of-load applications
Power Management
<Home Electronics <Handheld <Portable <Mobi le <Disk Dr ives
Selection Guide
Innovat ions Embedded
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Current Mode Step-Down Regulatorsfrom ROHM Semiconductor
Point-of-load, step-down voltage
regulators play an essential role in the
power distribution and management
in a wide range of electronic devices.
The new BD91x Series of regulators
from ROHM Semiconductor offers
designers an exceptional choice due to
their high efficiency over full load to light
load conditions, fast load response, a
wide range of input voltages, available
adjustable output voltage down to 1V and
available chip-scale packaging.
High-frequency PWM voltage output
control is enhanced using current mode
feedback to provide exceptional load
response. In addition, light load efficiency
is maintained using ROHM’s innovative
Simple Light Load Mode (SLLM) control.
BD91x Series devices are designed
to seamlessly transfer between full
PWM and SLLM based on load current
requirements.
Adjustable Output Voltage
Simple resistor network sets output voltage on some models. Fixed output models (±2%) also offered.
Enhanced Protection Circuitry
Built-in thermal shut-down, over-current and under-voltage lockout protection assure system reliability.
PWM / SLLM Control
Two-tier control strategy maximizes power efficiency over a full range of load conditions.
High Efficiency CMOS Output
BD91x Series devices all incorporate ROHM’s P-channel / N-channel power CMOS output that provides both low ON-resistance and low switching losses while reducing the number of external components.
Current Mode Feedback
Current mode feedback assures stable voltage regulation during rapid load changes.
1.888.775.ROHM www.rohmsemiconductor.com CNAxxxx
Current Mode Step-Down Regulatorsfrom ROHM Semiconductor
Designed for Efficiency and Reliability
Low ON-resistance MOSFETs (using DMOS process) results high efficiency buck regulation with a minimum of external components.
Current Mode PWM control maintains stable output voltage during load transients.
Simple Light Load Mode control sustains high efficiency operation during lightly loaded conditions.
Most internal circuits are turned off during standby, reducing standby current to virtually zero and improving battery life in portable applications.
Output stabilization simply requires a small low ESR ceramic capacitor, saving space and increasing efficiency.
Smaller output inductor size reduces overall circuit footprint.
Protection from ESD voltage of up to 4 kV Human Body Model (HBM) has been achieved through optimization of processes and circuitry.
Built-in protection circuits guard against over-current, over-temperature and under-voltage.
Wide operating temperature range makes these devices suitable for a wide range of applications.
SW
IL
Vo
0A
Vo(AVE)
0
20
40
60
80
100
0.001 0.01 0.1 1
Output Current[A]
Eff
icie
ncy[
%]
SLLM
SW
IL
Vo
0ANon-
Switching
Vo(AVE)
IntermittentSwitching
Power Loss ElementsSwitching Loss PSW
Gate Drive Loss PGATE
ESR Loss PESR
SLLM switching waveform
Reduced
PWM switching waveform
Simple Light Load Mode (SLLM)
1.888.775.ROHM www.rohmsemiconductor.com CNAxxxxx
Current Mode Step-Down Regulatorsfrom ROHM Semiconductor
Simple Light Load Mode Control (SLLM)
Efficiency ratings for power supplies at full load do not
adequately reflect the unit’s power consumption under actual
operation conditions. To extend the length of operation of
portable products on a single battery charge, power must
be reduced in all operating modes. Improved efficiency at
all operating points including more typical situations such as
very light loads is an important concern in the design of next
generation “green” products.
The BD91X Series of step-down regulators incorporates a
two-stage regulation technique designed to seamlessly and
efficiently deliver power to the load under widely varying load
conditions. Under large load conditions, conventional PWM
control is employed; under light load conditions, Simple Light
Load Mode control is used.
To download an informative white paper providing more details on ROHM’s innovative SLLM control, click on this link:
“Optimizing Power Efficiency in POL Switching Regulators Using SLLM (Simple Light Load Mode) Control.”
1.888.775.ROHM www.rohmsemiconductor.com CNAxxxxx
Current Mode Step-Down RegulatorsPart Selection Guide
Number of Input Voltage Output Voltage Output Operating Operating Feature Package Outputs Current Temperature Frequency
BD9122GUL 1 2.5 ~ 5.5V Adj (1.0~2.0V) 0.3A -30~ 85°C 1MHz Small package VCSP50L2 (WL-CSP) (1.1×2.5)
BD9180GUL 1 2.3 ~ 5.5V 1.875V±1.5% 0.3A -30~ 85°C 2MHz Ultra Small package VCSP50L1 (1.1×1.6)
BD9192GUL 2 2.3 ~ 5.5V 1.2V±1.5% 0.3A -30~ 85°C 2MHz 2ch DC/DC Output VCSP50L2 1.8V±1.5% Ultra Small package (1.1×2.5)
BD9161FVM 1 2.5 ~ 4.5V Adj (1.0~3.3V) 0.6A -25~ 85°C 1MHz 100% Max Duty Function MSOP (2.9×4.0)
BD9102FVM 1 4.0 ~ 5.5V 1.24V ±2% 0.8A -25 ~ 85°C 1MHz No Output Resistors Required MSOP8 (2.9×4.0)
BD9106FVM 1 4.0 ~ 5.5V Adj (1.0~2.5V) 0.8A -25 ~ 85°C 1MHz Fast Transient Response MSOP8 High Efficiency (2.9×4.0)
BD9109FVM 1 4.5 ~ 5.5V 3.30V ±2% 0.8A -25 ~ 85°C 1MHz No Output Resistors Required MSOP8 (2.9×4.0)
BD9120HFN 1 2.7 ~ 4.5V Adj (1.0~1.5V) 0.8A -25 ~ 85°C 1MHz Fast Transient Response HSON8 High Efficiency (2.9×3.0)
BD9151MUV 2 2.8 ~ 5.5V 1.2V±1.5% 0.8A -40 ~ 85°C 1MHz Start-up Sequence VQFN020V4040 1.8V±1.5% 0.8A Pch Switch Control (4.0×4.0)
BD9104FVM 1 4.5 ~ 5.5V 3.30V ±2% 0.9A -25 ~ 85°C 1MHz No Output Resistors Required MSOP8 (2.9×4.0)
Lower Current Models – Output Current (lo)<1A
Number of Input Voltage Output Voltage Output Operating Operating Feature Package Outputs Current Temperature Frequency
BD9107FVM 1 4.0 ~ 5.5V Adj (1.0~1.8V) 1.2A -25 ~ 85°C 1MHz Fast Transient Response MSOP8 High Efficiency (2.9×4.0)
BD9150MUV 2 4.75 ~ 5.5V 3.30V±1.5% 1.5A -40 ~ 85°C 1.5MHz 2ch DC/DC Output VQFN020V4040 Adj (0.8~2.5V) Small package (4.0×4.0)
BD9152MUV 2 4.5 ~ 5.5V 3.30V±1.5% 1.5A -40 ~ 85°C 1MHz 2ch DC/DC Output VQFN020V4040 Adj (0.8~2.5V) with Start-up Sequence (4.0×4.0)
BD9110NV 1 4.5 ~ 5.5V Adj (1.0~2.5V) 2.0A -25 ~ 105°C 1MHz Low Ripple Output SON008V5060 (5.0×6.0)
BD9111NV 1 4.5 ~ 5.5V 3.30V±1.5% 2.0A -25 ~ 105°C 1MHz Fast Transient Response SON008V5060 High Efficiency (5.0×6.0)
BD9130NV 1 2.7 ~ 5.5V Adj (1.0~2.5V) 2.0A -25 ~ 105°C 1MHz Fast Transient Response SON008V5060 High Efficiency (5.0×6.0)
BD9130EFJ 1 2.7 ~ 5.5V Adj (1.0~2.5V) 2.0A -25 ~ 105°C 1MHz Fast Transient Response HTSOP-J8 High Efficiency (5.0×6.0)
BD9132MUV 1 2.7 ~ 5.5V Adj (1.0~2.5V) 3.0A -40 ~ 105°C 1MHz Very High Efficiency VQFN020V4040 (4.0×4.0)
BD9139MUV 1 2.7 ~ 5.5V Adj (1.0~3.3V) 3.0A -40 ~ 105°C 1MHz Very High Efficiency VQFN016V3030 Small Package (3.0×3.0)
BD9134MUV 1 4.5 ~ 5.5V 3.30V±1.5% 3.0A -40 ~ 105°C 1MHz No Output Resistors Required VQFN020V4040 (4.0×4.0)
BD9137MUV 1 2.7 ~ 5.5V Adj (1.0~3.3V) 4.0A -40 ~ 105°C 1MHz Excellent Efficiency VQFN020V4040 PWM/SLLM select (4.0×4.0)
BD9141MUV 1 4.5~13.2V Adj (3.0~6.0V) 2.0A -40 ~ 105°C 500 kHz High Input Voltage VQFN020V4040 (4.0×4.0)
Higher Current Models – Output Current (lo)>1A
Current Mode Step-Down RegulatorsPackage Dimensions
1.888.775.ROHM www.rohmsemiconductor.com CNAxxxxx
Actual size
[Unit : mm]
VQFN020V4040
4.0±0.1
4.0±
0.1
2.1±0.1
0.4±
0.1
C0.21 5
6
101115
16
20
2.1±
0.1
(0.2
2)
1.0M
AX
0.02
+0.0
3-0
.02
0.250.51.0
-0.04+0.05
S
S0.08
HSON8
Actual size
[Unit : mm]
2.90±0.2 (2.2) (0.05)
0.32±0.100.65
0.4758 7 6 5
21 3 4
2.90
±0.2
3.00
±0.2
0.6M
ax.
(0.2
)(1
.8)
(0.2
)
(0.3
0)(0
.15)
(0.4
5)
0.13+0.1-0.05
Actual size
[Unit : mm]
SON008V50605.0±0.15
4.2±0.11.27
C0.25 1 2
8 7 6 5
3 4
1PIN MARK
6.0±
0.15
3.6±
0.1
0.8±
0.1
(0.2
2)1.0M
AX
0.02
+0.0
3-0
.02
0.40.59
+0.05-0.04
S
S0.08
Actual size
[Unit : mm]
VCSP50L1
1.1±0.05
1PIN MARK
TOP VIEW
SIDE VIEW
BOTTOM VIEW
1 20.5
1.6±
0.05
0.3±
0.05
0.1±
0.05
0.55
MAX
0.3±0.05
(ø0.15)INDEX POST
6-ø0.25±0.05
P=0.
5X2
S
S0.08
BA0.05
B
B
Actual size
[Unit : mm]
MSOP8
2.9±0.1
4.0±
0.2
2.8±
0.1
8 5
1 4
0.75
±0.0
50.
08±0
.050.
9MAX
0.29
±0.0
150.
6±0.
2
0.1450.475 +0.05-0.03
0.22
0.65
+0.05-0.04
S0.08
M0.08
Actual size
[Unit : mm]
VCSP50L2
1.1±0.05
1PIN MARK
TOP VIEW
SIDE VIEW
BOTTOM VIEW
1 20.5
2.5±
0.05
0.3±
0.05
0.1±
0.05
0.55
MA
X
0.3±0.05
(ø0.15)INDEX POST
6-ø0.25±0.05
P=0.
5X2
S
S0.08
BA0.05
B
B
NOTE: For the most current product information, contact a ROHM sales representative in your area.
ROHM assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representations that the circuits are free from patent infringement. Specifications subject to change without notice for the purpose of improvement.
The products listed in this catalog are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of which would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance.
© 2009 ROHM Semiconductor USA, LLC. Although every effort has been made to ensure accuracy, ROHM accepts no responsibility for errors or omissions. Specifications and product availability may be revised without notice. No part of this document represents an offer or contract. Industry part numbers, where specified, are given as an approximate comparative guide to circuit function only. Consult ROHM prior to use of components in safety, health or life-critical systems. All trademarks acknowledged.
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