MAX8645X_08 datasheet(3/14 Pages) MAXIM

Part #	MAX8645X

Description	1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN

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Manufacturer	MAXIM [Maxim Integrated Products]

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ELECTRICAL CHARACTERISTICS (continued)

(VIN = 3.6V, VGND = VPGND = 0V, ENM1 = ENM2 = ENF = IN, RSETM = RSETF = 6.8kΩ, P1 = P2 = unconnected, CREF = 0.01µF,

TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

1x to 1.5x or 1.5x to 2x Mode

Transition Threshold

90

100

110

mV

Input Voltage-Mode Transition

Hysteresis

150

mV

Charge-Pump Maximum OUT

Current

VIN

≥ 3.15V, VOUT = 3.9V

580

mA

1x mode (VIN - VOUT) / IOUT

0.3

1.0

1.5x mode (1.5VIN - VOUT) / IOUT

1.1

4.0

Open-Loop OUT Resistance

2x mode (2VIN - VOUT) / IOUT

1.5

4.14

Ω

Charge-Pump Short-Circuit

Current

VOUT < 1.25V

500

mA

Switching Frequency

1

MHz

OUT Pulldown Resistance in

Shutdown

ENM_ = ENF = GND

5

k

Ω

LED DRIVER

SET_ Bias Voltage

TA = +25°C

0.6

V

TA = +25°C

0.01

1

SET_ Leakage in Shutdown

ENM_ = ENF = GND

TA = +85°C

0.1

µA

SET_ Current Range

10

145

µA

SETM-to-Main LED Current Ratio

(IM_/ISETM)

100% setting, M1–M6

230

A/A

SETF-to-Flash LED Current Ratio

(IF_/ISETF)

100% setting, F1 and F2

1380

A/A

TA = +25°C

-1.25

+1.25

M_, F_ Current Accuracy

TA = -40°C to current derating start temperature

-4

+4

%

Maximum Main LED Sink Current

RSETM = 4.6k

Ω, for each M_

30

mA

Maximum Flash LED Sink Current

RSETF = 4.12k

Ω, IF1 + IF2

400

mA

Current-Derating-Function Start

Temperature

+40

°C

Current-Derating-Function Slope

TA = +40°C to +85°C

-1.7

%/°C

Dropout Voltage

(Note 2)

40

90

mV

1.5x and 2x Regulation Voltage

150

mV

TA = +25°C

0.01

2

M_, F_ Leakage in Shutdown

ENM_ = ENF = GND

TA = +85°C

0.1

µA

LDO_

Output Voltage Accuracy

ILDO_ = 150mA, relative to VOUT(NOM) (Note 3)

-1.7

0

+1.7

%

Output Current Range

0

200

mA

Current Limit

VLDO_ = 0V

280

475

750

mA

Soft-Start Current Limit

160

mA

1x/1.5x/2x White LED Charge Pumps with Two

LDOs in 4mm x 4mm TQFN

_______________________________________________________________________________________

3

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