BM81810MUF-M datasheet(64/78 Pages) ROHM

部品番号	BM81810MUF-M

部品情報	Automotive Panel Power Management IC

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BM81810MUF-M

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64/75

TSZ02201-0A3A0AS00510-1-2

15.May.2020 Rev.001

TSZ22111

• 15 • 001

www.rohm.com

Protection function explanation of POWER MANAGEMENT block

I.

UNDER VOLTAGE LOCK OUT (UVLO)

The BM81810MUF-M has UVLO function for VIN and a circuit miss-operation during in under UVLO voltage operation is

prevented. If VIN below UVLO voltage, it shuts down VDD, AVDD, VGH, VGL, GPM, VCOM and RESET.

II.

THERMAL SHUTDOWN (TSD)

The BM81810MUF-M incorporates a Thermal Shut Down (TSD) function. If IC temperature exceeds 175°C (TYP), it shuts

down VDD, AVDD, VGH, VGL, GPM, VCOM and RESET.

III. UNDER VOLTAGE PROTECTION (UVP)

This block has Under Voltage Protection (UVP) function for VDD, AVDD, VGH and VGL output.

When detecting UVP, inner Counter will be activated, and after 5ms passed, it shuts down VDD, AVDD, VGH, VGL, GPM,

and VCOM. (It also shuts down RESET when RESET monitors VDD voltage.)

IV. OVER VOLTAGE PROTECTION (OVP)

This block has Over Voltage Protection (OVP) function for AVDD output.

When detecting OVP, output voltage rising is limited by forcing Switching turn off. If output voltage falls, Switching is

restarted.

V.

OVER CURRENT PROTECTION (OCP)

This block has Over Current Protection (OCP) function for VDD and AVDD.

When detecting OCP, it controls Switching and limits generating over current in FET.

BLOCK

Protective Function

Working Condition

Action

Protective removal

VDD

Over current Protection

( Buck DCDC mode )

ISWB > 1.0 A (Min)

Control switching pulse duty to not over

current limit

ISWB < 1.0 A (Min)

Over current Protection

( LDO mode )

ISWB > 0.3 A (Min)

Control LDO to not over current limit.

ISWB < 0.3 A (Min)

Under Voltage Protection

Detect

: VDD<Target value x 0.8

Release : VDD>Target value x 0.9

IC shutdown

if UVP status maintains during 5ms

IC restart

AVDD

Over Voltage Protection

AVDD > (Target value x 1.1)

Switching STOP

AVDD < ( Target Value x 1.05 )

Over current Protection

ISW > 1.0 A (Min) or 2.0 A (Min)

Control switching pulse duty to not

over current limit

ISW < 1.0 A (Min) or 2.0 A (Min)

IC shutdown

if OCP status maintains during 5ms

IC restart

Under Voltage Protection

Detect

: AVDD<Target value x 0.8

Release : AVDD>Target value x 0.9

IC shutdown

if UVP status maintains during 5ms

IC restart

VGH

Under Voltage Protection

Detect

: VGH<Target value x 0.8

Release : VGH>Target value x 0.9

IC shutdown

if UVP status maintains during 5ms

IC restart

VGL

Under Voltage Protection

Detect

: VGL>Target value x 0.8

Release : VGL<Target value x 0.85

IC shutdown

if UVP status maintains during 5ms

IC restart

General

Under Voltage Lockout

VIN < 2.0V (Min)

IC shutdown

VIN > 2.55V (Typ)

Thermal shutdown

Tj > 175°C (Typ)

IC shutdown

Tj < 150°C (Typ)

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