A8603KESTR-R datasheet(7/42 Pages) ALLEGRO

7 / 42 page

Multiple-Output Regulator for

Automotive LCD Displays

A8603

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

ERROR AMPLIFIER

Open-Loop Voltage Gain [2]

AVOL

–

Transconductance [2]

ICOMP = between –100 µA and 100 µA

–

550

–

µA/V

EA Source Current

IEA_SRC

VCOMP = 0.7 V, VOUT below regulation target

–

200

–

µA

EA Sink Current

IEA_SINK

VCOMP = 0.7 V, VOUT over regulation target

–

200

–

µA

COMP Pull-Down Resistor

RCOMP1

Active pull-down when EN = H, Boost disabled

–

2.5

–

kΩ

RCOMP2

Passive pull-down when EN = L

–

450

–

kΩ

LOGIC INPUTS

EN Pin Logic High

VIH_EN

•

1.8

–

EN Pin Logic Low

VIL_EN

•

–

0.8

Internal Pull-Down Resistance to

AGND

REN(PD)

–

100

–

kΩ

Hard-Reset Duration [2]

tRESET

EN = L duration in order to initiate a hardware

reset during normal operation

–

µs

FSET Pin Input Logic High

VIH_FSE

When used in external sync mode

•

1.5

–

FSET Pin Input Logic Low

VIL_FSE

When used in external sync mode

•

–

0.4

OVER- AND UNDERVOLTAGE PROTECTION FOR OUTPUT REGULATORS

Output Overvoltage Fault Threshold

VOUTx(OV)

Output rising; measured as % of target voltage

–

120

–

Output Undervoltage Fault Threshold

VOUTx(UV)

Output falling; measured as % of target voltage

–

OUTPUT REGULATORS

AVDD Output Voltage

VAVDD

•

–

VCOM Output Voltage

VVCOM

VAVDD > VVCOM + 1.5 V

•

2.5

–

7.5

VGH Output Voltage

VVGH

VGH & VGH3 shorted

•

–

VGL Output Voltage

VVGL

•

–12

–

–4

Boost Minimum Headroom for

AVDD Regulator

VAVDD(DO)

Defined as VOUT – VAVDD; when AVDD = 15 V,

IOUT = 100 mA

–

2.1

–

Boost Minimum Headroom for

VGH Regulator

VVGH(DO)

Defined as VOUT – VVGH / 2; when VVGH = 24 V,

IOUT = 8 mA

–

2.9

–

Boost Minimum Headroom for

VGL Regulator

VVGL(DO)

Defined as VOUT – (–VVGL); when VVGL = –12 V,

IOUT = –8 mA

–

3.5

–

Ouptut Pull-Down Resistor During

Shutdown (AVDD, VCOM)

ROUTPD1

EN = high, output disabled

–

250

–

Ouptut Pull-Down Resistor During

Shutdown (VGH, VGL)

ROUTPD2

EN = high, output disabled

–

500

–

Ouptut Pull-Down Resistor in Sleep

Mode (AVDD, VCOM, VGH)

ROUTPD3

EN = low, VIN > VUVLO

–

kΩ

Ouptut Pull-Down Resistor in Sleep

Mode (VGL only)

ROUTPD4

EN = low

–

kΩ

ELECTRICAL CHARACTERISTICS [1] (continued): Valid at VIN = 5 V, EN = high, fSW = 2 MHz, VAVDD = 10 V, VVGH1 = 20 V, VVGL = –8 V,

TJ = TA = 25°C, except • indicates specifications guaranteed for TJ = TA = −40°C to 125°C, unless otherwise specified

Continued on the next page…

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