BD9P105MUF-CE2 datasheet(21/60 Pages) ROHM

Part #	BD9P105MUF-CE2

Description	3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive

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Manufacturer	ROHM [Rohm]

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28.Apr.2020 Rev.001

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TSZ22111 • 15 • 001

BD9P1x5MUF-C Series

TSZ02201-0J1J0AL01500-1-2

Function Explanation – continued

5.

External Synchronization Function

By applying clock signal to the MODE pin, the switching frequency can be synchronized to the external clock signal.

When clock signal is applied with the synchronization frequency range between 1.8 MHz and 2.4 MHz and the duty

range between 25 % and 75 %, the Synchronous mode is started after 4 rising edges of the clock signal. In addition, this

function is enabled after VRESET becomes high. If the duration between each rising edge exceeds 0.9 µs (Typ) or more,

the Synchronous mode is deactivated and switching operation by internal clock is activated (the Non-Synchronous

mode). The Spread Spectrum function cannot be activated during the Synchronous mode.

VIN

VEN

VOUT

VSW

VRESET

VMODE

Non-Synchronous

tDLY

tRSTNACT

Synchronous

0.9

μs (Typ)

VRTH

3.6 ms

(Typ)

400 µs

(Typ)

Non-Synchronous

Synchronous

Figure 35. External Synchronization Function

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