Power Management Current Mode Step-Down Regulators · Current Mode Step-Down Regulators from ROHM Semiconductor Point-of-load, step-down voltage regulators play an essential role

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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.

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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)



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.”


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)


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)


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


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.

www.rohmsemiconductor.com | 1.888.775.ROHM

10145 Pacific Heights Blvd., Suite 1000

San Diego, CA 92121

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Power Management Current Mode Step-Down Regulators · Current Mode Step-Down Regulators from ROHM Semiconductor Point-of-load, step-down voltage regulators play an essential role