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MAX8631YETI
(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

Soft-Start Done Time

Dropout Voltage

Load Regulation

Power-Supply Rejection

∆VOUT/∆VIN

Output Noise Voltage (RMS)

CONDITIONS

ILDO_ = 200mA (Note 4)

VIN = 3.7V, 100µA < ILDO_ < 200mA

10Hz to 10kHz, CLDO_ = 1µF, ILDO_ = 10µA

10Hz to 100kHz, CLDO_ = 1µF, ILDO_ = 10mA

MIN TYP MAX UNITS

100

µs

120

320

mV

1.3

%

-60

dB

40

µVRMS

Note 1: All devices are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by

design.

Note 2: LED dropout voltage is defined as the M_ or F_ to GND voltage at which current into M_ or F_ drops 10% from the value at

M_ or F_ = 0.2V.

Note 3: (Greater of 2.7V or (VLDO_ + 0.5V)) ≤ VIN ≤ 5.5V.

Note 4: LDO dropout voltage is defined as VIN - VOUT when VOUT is 100mV below the value of VOUT measured when VIN =

VOUT(NOM) + 1V. Since the minimum input voltage is 2.7V, this specification is only meaningful when VOUT(NOM) > 2.5V.

Typical Operating Characteristics

(VIN = VEN_ = 3.6V, circuit of Figure 1, TA = +25°C, unless otherwise noted.)

EFFICIENCY vs. Li+ BATTERY

VOLTAGE DRIVING FOUR MAIN LEDs

100

90

80

EFFICIENCY vs. Li+ BATTERY

VOLTAGE DRIVING FLASH LED MODULE

100

80mA TOTAL

90 160mA TOTAL

80

BATTERY CURRENT vs. SUPPLY VOLTAGE

DRIVING FOUR MAIN LEDs

120

ILED = 15mA

100

VIN FALLING

VIN RISING

80

70

60

50

40

2.7

15mA/LED

4.5mA/LED

1.5mA/LED

3.0 3.3 3.6 3.9 4.2

Li+ BATTERY VOLTAGE (V)

70

60

50 400mA TOTAL

40

2.7 3.0 3.3 3.6 3.9 4.2

Li+ BATTERY VOLTAGE (V)

60

ILED = 4.5mA

40

20

ILED = 1.5mA

0

2.7 3.0 3.3 3.6 3.9 4.2

SUPPLY VOLTAGE (V)

4 _______________________________________________________________________________________

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