BD9639MWV

8/22

TSZ02201-0313AA400630-1-2

© 2016 ROHM Co., Ltd. All rights reserved.

www.rohm.com

TSZ22111・15・001

09.Feb.2016 Rev.001

(4) CH1

(a) Function

Selectable PWM/PFM boost DC/DC converter.

Output voltage is ranges from 3.7[V] to 5.5[V].

Low voltage operation starts up from 2.5[V] and also provides supply voltage to VREF circuit.

Parts Name

Value

Maker

Part Number

620[kΩ] +24[kΩ]

-

-

56[kΩ]

-

-

10[Ω]

-

-

22[µF]

(x2)

Taiyo Yuden

JMK212BJ226MG

10[µF]

Taiyo Yuden

JMK212BJ106KG

100[pF]

Taiyo Yuden

UMK1005CH101JV

1[µF]

Taiyo Yuden

JMK105BJ105KV

2.2[µH]

Taiyo Yuden

NR4018T2R2N

-

ROHM

RB060M-30

(c) Start-up Sequence

(d) PWM/PFM

Select PWM/PFM (operation of XSHDN=HIGH and XSHDN24) with light load (10mA or less).

Electricity is discharged

XSHDN1

0[V]

H input voltage

OUT1

0[V]

≈ VBAT[V]

VBAT

2.5[V] to 5.5[V]

Soft start period

according to the load.

0[V]

3.7[V] to 5.5[V]

PFM operation

XSHDN24

3.7[V]to 5.5[V]

OUT1

（Load 5mA or less)

PWM operation

（Load 5mA or less)

PFM operation

0[V]

H input voltage

FB1

VOUT1

VOUT1

PFM

PWM

0.4[V]

PRE

DRIVER

Start up circuit

SW1

PGND1

VOUT1

VBAT

PWM/PFM

VBAT

VBAT

MAX.

DUTY

OUT1

OUT1

OUT1

MAX