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MAX8631XETI
(Rev.:2006)

1x/1.5x/2x White LED Charge Pump with Two LDOs in 4mm x 4mm Thin QFN

Maxim Integrated 

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

LDOs in 4mm x 4mm Thin QFN

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

Open-Loop OUT Resistance

Charge-Pump Short-Circuit

Current

Switching Frequency

OUT Pulldown Resistance in

Shutdown

LED DRIVER

SET_ Bias Voltage

SET_ Leakage in Shutdown

SET_ Current Range

SETM-to-Main LED Current Ratio

(IM_/ISETM)

VIN ≥ 3.15V, VOUT = 3.9V

1x mode, (VIN - VOUT) / IOUT

1.5x mode, (1.5VIN - VOUT) / IOUT

2x mode, (2VIN - VOUT) / IOUT

VOUT < 1.25V

ENM_ = ENF = GND

TA = +25°C

ENM_ = ENF = GND

100% setting, M1–M4

TA = +25°C

TA = +85°C

580

mA

0.3

1.0

1.1

4.0

Ω

1.5

4.14

500

mA

1

MHz

5

kΩ

0.6

V

0.01

1

µA

0.1

10

145

µA

230

A/A

SETF-to-Flash LED Current Ratio

(IF_/ISETF)

100% setting, F1–F4

M_, F_ Current Accuracy

Maximum Main LED Sink Current

Maximum Flash LED Sink Current

TA = +25°C

TA = -40°C to current derating start temperature

RSETM = 4.6kΩ, for each M_

RSETF = 4.12kΩ, IF1 + IF2 + IF3 + IF4

Current-Derating-Function Start

Temperature

Current-Derating-Function Slope TA = +40°C to +85°C

Dropout Voltage

(Note 2)

1.5x and 2x Regulation Voltage

M_, F_ Leakage in Shutdown

LDO_

Output Voltage Accuracy

Output Current Range

ENM_ = ENF = GND

TA = +25°C

TA = +85°C

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

Current Limit

Soft-Start Current Limit

VLDO_ = 0V

-1.25

-4

690

30

400

+40

-1.7

40

150

0.01

0.1

+1.25

+4

90

1

A/A

%

mA

mA

°C

%/°C

mV

mV

µA

-1.7

0

+1.7

%

0

200

mA

280

475

750

mA

160

mA

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