Current Mode Step-Down Regulators

Innovations Embedded
Power Management
Current Mode Step-Down
Regulators
for point-of-load applications
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Selection Guide
Current Mode Step-Down Regulators
from ROHM Semiconductor
load conditions, fast load response, a
is maintained using ROHM’s innovative
regulators play an essential role in the
Point-of-load, step-down voltage
wide range of input voltages, available
Simple Light Load Mode (SLLM) control.
power distribution and management
adjustable output voltage down to 1V and
BD91x Series devices are designed
in a wide range of electronic devices.
available chip-scale packaging.
to seamlessly transfer between full
The new BD91x Series of regulators
High-frequency PWM voltage output
from ROHM Semiconductor offers
control is enhanced using current mode
designers an exceptional choice due to
feedback to provide exceptional load
their high efficiency over full load to light
response. In addition, light load efficiency
PWM and SLLM based on load current
requirements.
Current Mode Feedback
Current mode feedback assures stable voltage
regulation during rapid load changes.
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.
Adjustable Output Voltage
Simple resistor network sets output voltage
on some models. Fixed output models
(±2%) also offered.
1.888.775.ROHM
Enhanced Protection Circuitry
PWM / SLLM Control
Built-in thermal shut-down, over-current and
under-voltage lockout protection assure
system reliability.
Two-tier control strategy maximizes power
efficiency over a full range of load conditions.
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Current Mode Step-Down Regulators
from 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.
1.888.775.ROHM
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Current Mode Step-Down Regulators
from ROHM Semiconductor
Simple Light Load Mode Control (SLLM)
Efficiency ratings for power supplies at full load do not
The BD91X Series of step-down regulators incorporates a
adequately reflect the unit’s power consumption under actual
two-stage regulation technique designed to seamlessly and
operation conditions. To extend the length of operation of
efficiently deliver power to the load under widely varying load
portable products on a single battery charge, power must
conditions. Under large load conditions, conventional PWM
be reduced in all operating modes. Improved efficiency at
control is employed; under light load conditions, Simple Light
all operating points including more typical situations such as
Load Mode control is used.
very light loads is an important concern in the design of next
generation “green” products.
Power Loss Elements
Switching Loss P SW
Gate Drive Loss P GATE
ESR Loss P ESR
Reduced
SLLM switching waveform
PWM switching waveform
SW
SW
IL
Intermittent
Switching
0A
Vo
IL
NonSwitching
0A
Vo(AVE)
Vo
Simple Light Load Mode (SLLM)
Efficiency[%]
100
80
Vo(AVE)
SLLM
60
40
20
0
0.001
0.01
0.1
1
Output Current[A]
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.”
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Current Mode Step-Down Regulators
Part Selection Guide
Lower Current Models – Output Current (lo)<1A
Number of
Input Voltage
Output Voltage
Outputs
Output
Current
Operating
Temperature Operating
Frequency
BD9122GUL
1
2.5 ~ 5.5V
Adj (1.0~2.0V)
0.3A
-30~ 85°C
1MHz
Feature
Package
Small package
(WL-CSP)
VCSP50L2
(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
VCSP50L2
(1.1×2.5)
2
2.3 ~ 5.5V
1.2V±1.5%
0.3A
-30~ 85°C
2MHz
1.8V±1.5%
2ch DC/DC Output
Ultra Small package
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
MSOP8
(2.9×4.0)
1
4.0 ~ 5.5V
Adj (1.0~2.5V)
0.8A
-25 ~ 85°C
1MHz
Fast Transient Response
High Efficiency
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
Fast Transient Response
High Efficiency
HSON8
(2.9×3.0)
Start-up Sequence
Pch Switch Control
VQFN020V4040
(4.0×4.0)
1
2.7 ~ 4.5V
Adj (1.0~1.5V)
0.8A
-25 ~ 85°C
1MHz
BD9151MUV
2
2.8 ~ 5.5V
1.2V±1.5%
1.8V±1.5%
0.8A
-40 ~ 85°C
1MHz
0.8A
BD9104FVM
1
4.5 ~ 5.5V
3.30V ±2%
0.9A
-25 ~ 85°C
1MHz
No Output Resistors Required
MSOP8
(2.9×4.0)
Higher Current Models – Output Current (lo)>1A
Number of
Input Voltage
Output Voltage
Outputs
Output
Current
Operating
Temperature Operating
Frequency
BD9107FVM
1
4.0 ~ 5.5V
Adj (1.0~1.8V)
1.2A
-25 ~ 85°C
1MHz
BD9150MUV
2
4.75 ~ 5.5V
3.30V±1.5%
Adj (0.8~2.5V)
BD9152MUV
3.30V±1.5%
1.5A -40 ~ 85°C
1MHz
Adj (0.8~2.5V)
2
4.5 ~ 5.5V
1.5A
-40 ~ 85°C
1.5MHz
Feature
Package
Fast Transient Response
High Efficiency
MSOP8
(2.9×4.0)
2ch DC/DC Output
Small package
VQFN020V4040
(4.0×4.0)
2ch DC/DC Output
with Start-up Sequence
VQFN020V4040
(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
High Efficiency
SON008V5060
(5.0×6.0)
BD9130NV
1
2.7 ~ 5.5V
Adj (1.0~2.5V)
2.0A -25 ~ 105°C
1MHz
Fast Transient Response
High Efficiency
SON008V5060
(5.0×6.0)
BD9130EFJ
Fast Transient Response
High Efficiency
HTSOP-J8
(5.0×6.0)
1
2.7 ~ 5.5V
Adj (1.0~2.5V)
2.0A -25 ~ 105°C
1MHz
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
VQFN016V3030
(3.0×3.0)
1
2.7 ~ 5.5V
Adj (1.0~3.3V)
3.0A -40 ~ 105°C
1MHz
Very High Efficiency
Small Package
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
Excellent Efficiency
PWM/SLLM select
VQFN020V4040
(4.0×4.0)
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)
1
2.7 ~ 5.5V
Adj (1.0~3.3V)
4.0A -40 ~ 105°C
1MHz
BD9141MUV
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Current Mode Step-Down Regulators
Package Dimensions
SON008V5060
[Unit : mm]
+0.05
0.25 -0.04
Actual size
8
(0.30)
(0.15)
(0.45)
(0.2)
3.00±0.2
2.90±0.2
0.6Max.
0.13 +0.1
-0.05
0.32±0.10
0.65
Actual size
VCSP50L2
1PIN MARK
[Unit : mm]
2.5±0.05
[Unit : mm]
TOP VIEW
1.1±0.05
0.1±0.05
0.55MAX
0.08 S
0.05
AB
(ø0.15)INDEX POST
Actual size
0.3±0.05
B
1
0.5
0.08
6-ø0.25±0.05
0.05
S
AB
B
(ø0.15)INDEX POST
B
P=0.5X2
6-ø0.25±0.05
SIDE VIEW
S
0.3±0.05
0.08 M
0.08 S
TOP VIEW
1.1±0.05
SIDE VIEW
S
B
1.888.775.ROHM
1 2 3 4
Actual size
1PIN MARK
0.145 +0.05
-0.03
0.22 +0.05
-0.04
0.65
0.4 +0.05
-0.04
5
1.6±0.05
2.8±0.1
0.9MAX
0.75±0.05
0.08±0.05
0.475
6
0.1±0.05
0.55MAX
4
4.0±0.2
1
7
0.29±0.015
0.6±0.2
2.9±0.1
(2.2) (0.05)
87 6 5
VCSP50L1
[Unit : mm]
5
4
0.59
MSOP8
8
3
2.90±0.2
3.6±0.1
11
0.5
2
0.3±0.05
10
15
1.27
1
P=0.5X2
6
16
1.0
4.2±0.1
C0.25
5
20
0.02 +0.03
-0.02
(0.22)
(0.22)
2.1±0.1
1
S
0.08 S
0.8±0.1
0.4±0.1
C0.2
S
2.1±0.1
0.08
0.02 +0.03
-0.02
S
[Unit : mm]
0.475
1PIN MARK
1.0MAX
1.0MAX
6.0±0.15
4.0±0.1
5.0±0.15
(1.8)
[Unit : mm]
4.0±0.1
HSON8
(0.2)
VQFN020V4040
2
BOTTOM VIEW
Actual size
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0.3±0.05
1
2
0.5
Actual size
BOTTOM VIEW
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San Diego, CA 92121
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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.