MAX16805_07 datasheet(4/19 Pages) MAXIM

Part #	MAX16805

Description	EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback

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Manufacturer	MAXIM [Maxim Integrated Products]

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EEPROM-Programmable, High-Voltage, 350mA

LED Drivers with LED Current Foldback

4

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VIN = VEN = 12V, CV5 = 0.1µF, IV5 = 0, CS- = GND, RSENSE = 0.56Ω, VDIM = 4V, DGND = GND, TFP/SCL = 5V, TFN/SDA = 0V,

SW = CFD = Open, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Maximum Thermal Foldback

Clamp Current Reduction Range

TFC(MAX)

+25

oC

≤ TA ≤ +125oC

100

%

Default Thermal Foldback Clamp

Current Reduction Range

TFDEF

Thermal Foldback Clamp register at

factory default (0x07),

+25

oC

≤ TA ≤ +125oC

40

%

THERMAL PROTECTION

Thermal Shutdown Temperature

TJ(SHDN)

+155

°C

Thermal Shutdown Hysteresis

+23

°C

LED CURRENT FOLDBACK

Minimum Input LED Current

Foldback Range

VCFD(MIN)

11.4

V

Maximum Input LED Current

Foldback Range

VCFD(MAX)

16.4

V

LED Current Foldback Default

Level

VCFD

LED Current Foldback Threshold register

at factory default (0x00)

16.4

V

VIN > 11V, CFD register bit 3 = 0

0.71

LED Current Foldback Voltage

Step Size

VIN > 11V, CFD register bit 3 = 1

0.355

V/step

INTERNAL RAMP GENERATOR

Internal RAMP Frequency

fRAMP

176

200

224

Hz

External Sync Frequency Range

fDIM

80

2000

Hz

External Sync Voltage Low

0.4

V

External Sync Voltage High

2.8

V

VDIM = 0V

0

Output Current Duty Cycle

IDC

VDIM > (VRAMP + 0.4V) (MAX16806),

VDIM > +3.3V (MAX16805)

100

%

Minimum Ramp Peak

Programming Range

VRAMP(MIN)

1.49

1.55

1.60

V

Maximum Ramp Peak

Programming Range

VRAMP(MAX)

2.77

2.88

3.00

V

Ramp Peak Default Voltage

Ramp Peak register at factory default

(0x07)

2.88

V

Ramp Offset Voltage

210

mV

MOMENTARY SWITCH INTERFACE (SW) (MAX16806)

SW Pullup Current

ISW

VSW = 0V

1

3

mA

SW Input-Voltage High

VIH

ISW = 100µA

4

V

SW Input-Voltage Low

VIL

0.4

V

Minimum Pulse Width

120

ms

Minimum Debounce Time

40

ms

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