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Datasheet

Datasheet

BD9876AEFJ

TSZ02201-0Q1Q0AJ00170-1-2

© 2013 ROHM Co., Ltd. All rights reserved.

28.JAN.2014 Rev.003

www.rohm.com

TSZ22111・15・001

Over Current Detect Current

Iocp

3.5

6

－

A

【CTL】

EN Pin Control voltage

ON

VENON

2

－

VCC

V

OFF

VENOFF

-0.3

－

0.8

V

EN Pin input current

REN

2.7

5.5

11

µA

VEN=3V

【SYNC】

SYNC Pin Control voltage

High

VSYNCH

2.0

－

5.5

V

Low

VSYNCL

-0.3

－

0.8

V

SYNC Pin input current

REN

6

12

24

µA

VSYNC=3V

SYNC falling edge to LX rising edge delay

tdelay

200

400

600

ns

◎Not designed to withstand radiation.

●Operating Ratings(Ta=25℃)

Item

Symbol

Ratings

Unit

Min

Typ

Max

Power Supply Voltage

VCC

7

－

42

V

Output Voltage

VOUT

1.0

(*2)

－

VCC×0.7

V

(*2)Restricted by minimum on pulse typ. 200ns

●Detailed Description

◇Synchronizes to External Clock

The SYNC pin can be used to synchronize the regulator to an external system clock. To implement the synchronization

feature connect a square wave to SYNC pin. The square wave amplitude must transition lower than 0.8V and higher than

2.0V on the SYNC pin and have an on time greater than 100ns and an off time greater than 100ns. The synchronization

frequency range is 200 kHz to 500 kHz. The rising edge of the LX will be synchronized to the falling edge of SYNC pin

signal after SYNC input pulse 3 count. At the synchronization, the external clock is removed, the device transitions

self-running mode after 7 microseconds.

SYNC

SYNC_LATCH

Lx

Set the latch for

synchronization

400nsec

about

7µsec

Figure 4. Timing chart at Synchronization