10/17

BD9161FVM

Datasheet

02.MAR.2012 Rev.001

www.rohm.com

TSZ02201-0J3J0AJ00190-1-2

© 2011 ROHM Co., Ltd. All rights reserved.

TSZ22111･15･001

Information on Advantages

Advantage 1：Offers fast transient response with current mode control system.

Voltage drop due to sudden change in load was reduced by about 50%.

Fig.24 Comparison of transient response

Advantage 2： Offers high efficiency for all load range.

・For lighter load:

Utilizes the current mode control mode called SLLM

Achieves efficiency improvement for lighter load.

・For heavier load:

Utilizes the synchronous rectifying mode and the low on-resistance

MOS FETs incorporated as power transistor.

ON resistance of P-

channel MOS FET: 0.35 Ω (Typ.)

ON resistance of N-

channel MOS FET: 0.37 Ω (Typ.)

Achieves efficiency improvement for heavier load.

Offers high efficiency for all load range with the improvements mentioned above.

Advantage 3： ・Supplied in smaller package due to small-sized power MOS FET incorporated.

・Allows reduction in size of application products

Reduces a mounting area required.

Fig.26 Example application

・Output capaci

tor Co required for current mode control: 10 μF ceramic capacitor

・

Inductance L required for the operating frequency of 1 MHz: 4.7 μH inductor

DC/DC

Convertor

Controller

L

Co

Cin

10mm

15mm

L

Conventional product (VOUT of which is 2.5 volts)

=250mA→500mA)

0.001

0.01

0.1

1

0

50

100

①

②

PWM

SLLM

TM

①inprovement by SLLM

②improvement by synchronous rectifier

Output current Io[A]

Fig.25 Efficiency

98mV

40mV