A8504 データシートの表示（PDF） - Allegro MicroSystems

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A8504

WLED/RGB Backlight Driver for Medium Size LCDs

Allegro MicroSystems 

A8504

WLED/RGB Backlight Driver for Medium Size LCDs

ELECTRICAL CHARACTERISTICS, valid at TA = –40°C to 85°C, typical values at TA = 25°C, VIN = 5 V, unless otherwise noted

Characteristics

Symbol

Test Conditions

Min. Typ. Max. Units

Input Voltage Range

Undervoltage Lockout Threshold

UVLO Hysteresis Window

Supply Current

Error Amplifier

VIN

VUVLO

VUVLOhys

ISUP

VIN falling

Switching at no load, TA = 25°C

Shutdown PWM = VIL

4.2

–

5.5

V

–

–

4

V

–

0.2

–

V

–

5

–

mA

–

0.1

1

μA

Error Amplifier Open Loop Gain

Error Amplifier Unity Gain Bandwidth

Error Amplifier Transconductance

Error Amplifier Output Sink Current

Error Amplifier Output Source Current

Boost Controller

AVEA

UGBEA

GmEA

IEAsink

IEAsource

∆ICOMP = ±10 μA

VLED1-8 = 1 V

VLED1-8 = 0 V

–

60

–

–

3

–

–

850

–

–

280

–

–

–280

–

dB

MHz

μA/V

μA

μA

RFSET = 13 kΩ, SKIP = VIL

Switching Frequency

fSW

RFSET = 26.1 kΩ, SKIP = VIL

RFSET = 32.4 kΩ, SKIP = VIH

Minimum Switch Off-Time

tOFFmin

Logic Input Levels (PWM, SELx, and SKIP pins unless otherwise specified)

1.8

2

2.2

–

1

–

–

200

–

–

70

–

MHz

MHz

kHz

ns

Input Voltage Level Low

Input Voltage Level High

Input Leakage Current (PWM, and SKIP

pins)

VIL

VIH

IIleak

VI(pin) = 5 V, TA = 25°C

–

–

0.4

V

1.5

–

–

V

–

–

100

μA

Input Leakage Current (SELx pins)

Over Voltage Protection (OVP)

ISELleak

–

–

1

μA

Output Overvoltage Rising Limit

OVP Sense Current

OVP Release Current

OVP Leakage Current

Boost Switch

VOVP

IOVPH

IOVPL

IOVPleak

VVOP = 21 V

28

–

32

V

–

49

–

μA

–

44

–

μA

–

0.1

–

μA

Switch On Resistance

Switch Leakage Current

Switch Current Limit

Rds(on)

ISWleak

ISWlim

ISW = 1.5 A

VSW = 5 V, TA = 25°C

VSW = 21 V

–

225

–

mΩ

–

–

1

μA

–

1

–

μA

1.6

2

–

A

Continued on the next page…

Allegro MicroSystems, Inc.

4

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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