A6284-1 datasheet(5/24 Pages) ALLEGRO

Part #	A6284-1

Description	Linear Current Regulator and Controller for Automotive LED Arrays

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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5 / 24 page

Linear Current Regulator and Controller

for Automotive LED Arrays

A6274, A6274-1

A6284, A6284-1

5

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

INPUT SPECIFICATIONS

Operating Input Voltage Range

VIN

●

5

–

42

V

Input Quiescent Current1

IQ

VENx = high, FULL mode

–

6

mA

Input Sleep Supply Current1

IQSLEEP

VEN1 = VEN2 = 0 V; VDR = VBIAS

●

–

6

μA

INTERNAL BIAS CIRCUIT

BIAS Pin Voltage

VBIAS

IBIAS = 0 to 7 mA, 5.6 V ≤ VIN ≤ 18 V

●

4.75

5

5.25

V

BIAS Pin Dropout

VBIASDROP

Minimum voltage drop across VIN and

BIAS pins. IBIAS < 7 mA, VIN = 5 V

–

0.3

–

V

VBIAS Undervoltage Release Threshold

VBIASSTART VIN rising

●

–

4.6

V

VBIAS Undervoltage Lockout Stop Threshold

VBIASSTOP

VIN falling

●

–

4.2

V

P-CHANNEL MOSFET DRIVER SPECIFICATION

GATE Sink Current1

IGATE(SINK)

Due to on-chip current limit, 10 V < VIN < 18 V

4

–

mA

Due to on-chip current limit, VIN = 5 V

2

–

mA

GATE Maximum Voltage (w.r.t. VIN)

VGATE(MAX) VIN – VGATE, VLEDx = 0.3 V

8

10

12

V

GATE Minimum Voltage (w.r.t. VIN)

VGATE(MIN) VIN – VGATE, VLEDx = 1 V

–

130

360

mV

PMOS Detect Threshold

VGATE(PMOS)

Voltage measured (VIN – VGATE) at end of

startup to detect PMOS connected

–

600

–

mV

LEDx CURRENT DRIVER SPECIFICATION

LEDx Regulation Voltage2a

VLEDreg

A6274; not in derating

●

–

0.4

0.7

V

A6284; not in derating

●

–

0.55

0.85

V

LEDx Accuracy3

ErrLEDx

Measured at ILED(MAX), LEDx mismatch < 0.5 V,

5 V < VIN < 18 V, TJ = 0°C to 150°C

–

2

3.5

%

LEDx Matching4

ΔILEDx

ISET2 connected to BIAS; compared to

average ILEDx, measured at ILED(MAX), LEDx

mismatch < 1 V, 5 V < VIN < 18 V

●

–

0.8

3

%

Maximum LEDx Current

ILED(MAX)

A6274

●

–

60

–

mA

A6284

●

–

120

–

mA

Minimum LEDx Current

ILED(MIN)

A6274

–

6

–

mA

A6284

–

12

–

mA

Maximum LED Current, ISETx Pin Short-to-

Ground2

ILED(ISETshrt)

A6274

–

66

–

mA

A6284

–

129

–

mA

LED Current Ramp Time

tRAMP

ILEDx 10% to 90% and 90% to 10%

–

8

–

μs

ISETx to ILEDx Gain

gILED

A6274

–

248

–

A/A

A6284

–

492

–

A/A

ISETx Voltage Level

VISET

0.015 mA ≤ IISETx ≤ 0.3 mA

–

1.2

–

V

Continued on the next page…

ELECTRICAL CHARACTERISTICS: Valid at VIN = 14 V, VENx = 3.3 V; ● indicates specifications across the full operating temperature

range with TJ = –40°C to 150°C; other specifications are at TJ = 25°C, unless noted otherwise. Refer to Figure 1 for typical application circuit.

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