BM81810MUF-M datasheet(48/78 Pages) ROHM

Teilenummer	BM81810MUF-M

Bauteilbeschribung	Automotive Panel Power Management IC

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Hersteller	ROHM [Rohm]

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BM81810MUF-M

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TSZ02201-0A3A0AS00510-1-2

15.May.2020 Rev.001

TSZ22111

• 15 • 001

www.rohm.com

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AVDD Block Function

ERRAMP

PWM

DAC

REGISTER

LOAD SWITCH

DRIVER

VIN

VLSO

PAVDD

PGND

SW

DISCHARGE

AVDD Block (Boost DC / DC) can set the following functions by EEPROM.

1.

AVDD Voltage (Register Address 00h [7:0])

AVDD voltage can be set in 0.1V step from 5.0V to 17.0V.

2.

SW Switching Frequency (Register Address 0Ch [1:0])

The switching frequency can be set at 525KHz, 1.05MHz or 2.1MHz.

3.

Soft Start Time (Register Address 0Bh [5:4])

Soft Start Time of AVDD can be set in 5ms step from 5ms to 20ms.

4.

SW Switching Slew Rate (Register Address 0Bh [3:2])

SW pin switching Slew Rate can be controlled by the register setting.

11

’b is the fastest slew rate setting, 00’b is the slowest slew rate setting.

The slew rate by each setting is as follows.

Slew Rate changes by the external part and load electric current conditions such as a coil or the diode, but adjustment

is possible on a true set condition because Slew Rate changes by Slew Rate setting change like Figure.79.

The EMI properties are improved by slowing a slew rate, but please do enough evaluations after a slew rate change

because efficiency becomes the tendency to decrease.

Figure 78. AVDD Block Diagram

Figure 79. AVDD Switching Slew Rate

(VIN=3.3V, AVDD=10.5V, Freq=2.1MHz, L=4.7

μH, IAVDD=100mA)

<xx>:AVDD Slew Rate setting

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