A8503 View Datasheet(PDF) - Allegro MicroSystems

Part Name

Description

MFG CO.

A8503

High Efficiency 6-Channel, 2 MHz, WLED/RGB Driver for Medium Displays, with Integrated 55 V Power Switch

Allegro MicroSystems 

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A8503

High Efficiency 6-Channel, 2 MHz, WLED/RGB Driver for

Medium Displays, with Integrated 55 V Power Switch

ELECTRICAL CHARACTERISTICS1 Valid using circuit shown in figure 1, TA = TJ = 25°C except indicates specifications

guaranteed from −40°C to 105°C, VIN = 5.0 V, EN = PWM = VIH, RISET = 12.4 kΩ, RFSET = 34 kΩ, MODE = AGND , unless otherwise

noted

Characteristics

Symbol

Test Conditions

Min. Typ.2 Max. Unit

Input Voltage Range

Undervoltage Lockout Threshold

Undervoltage Lockout Hysteresis Window

VIN

VUVLO VIN falling

VUVLOHYS

Switching, at no load

4.2

–

5.5

V

–

–

4.0

V

–

0.1

–

V

–

7

–

mA

Supply Current

Boost Controller

IVIN

Shutdown, EN= VIL, TA = 25°C

Standby, EN = VIH, PWM = VIL

–

0.1

1

μA

–

1

2

mA

Switching Frequency

Minimum Switch Off-Time

Minimum Switch On-Time

Logic Input Levels (EN and PWM pins)

fSW

toff(min)

ton(min)

1.2 1.5 1.9 MHz

–

72

–

ns

–

72

–

ns

Input Voltage Level Low

Input Voltage Level High

Input Leakage Current

Overvoltage Protection

VIL

VIH

IILKG

EN = PWM = 5 V

–

–

1.5

–

–

100

0.4 V

–

V

–

μA

Output Overvoltage Threshold

Overvoltage Protection Leakage Current

Overvoltage Protection Sense Current

Boost Switch

VOVP

IOVPLKG

IOVPH

VOVP = 22 V, ROVP = 0 Ω, EN = VIL

–

44

–

V

–

0.1

–

μA

–

240

–

μA

Switch On-Resistance

Switch Leakage Current

Switch Current Limit

LED Current Sinks

RDS(on)

ISWLKG(B)

ISWLIM

ISW = 1 A

VSW = 22 V

–

250

–

mΩ

–

0.1

–

μA

–

2.7

–

A

LEDx Pin Regulation Voltage

ISET to ILEDx Current Gain

ISET Pin Voltage

ISET Allowable Current Range

LEDx Current Accuracy3

LEDx Current Matching4

VLEDx

AISET

VISET

ISET

ErrILEDX

∆ILEDX

ISET = 100 μA

LED1 through LED6 = 0.6 V, at 100% Current

ISET = 100 μA, LED1 though LED6 = 0.6 V, at 100%

Current

–

600

–

mV

–

320

–

A/A

– 1.235 –

V

33

–

100 μA

–3 ±0.6 3

%

–3 ±0.6 3

%

Switch Leakage Current (LEDx)

LED Short-Detect Voltage

ISWLKG(L)

VSC

VLEDx = 12 V, EN = 0

LEDx pin voltage level that forces latched shutdown,

MODE = low

–

0.1

–

μA

–

18.7 –

V

Continued on the next page…

Allegro MicroSystems, Inc.

5

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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