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MAX8822

Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN

Maxim Integrated 

Ultra-Efficient Negative Charge-Pump LED

Driver with Dual LDOs in 3mm x 3mm Thin QFN

ABSOLUTE MAXIMUM RATINGS

IN, C1N, C2N, REF, ENLED, ENLDO, LDO1, LDO2

to GND...............................................................-0.3V to +6.0V

IN, REF, ENLED, ENLDO, LDO1, LDO2

to NEG ...............................................................-0.3V to +6.0V

LED_, C1N, C2N to NEG .............................-0.3V to (VIN + 0.3V)

C1P, C2P to GND ........................................-0.3V to (VIN + 0.3V)

NEG to GND ..........................................................-6.0V to +0.3V

NEG, LDO1, LDO2 Short-Circuit Current to GND ......Continuous

Continuous Power Dissipation (TA = +70°C)

16-Pin Thin QFN 3mm x 3mm

(derate 14.7mW/°C above +70°C) .............................1177mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(VIN = 3.6V, VGND = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)

PARAMETER

CONDITIONS

MIN TYP MAX

IN Operating Voltage

2.7

5.5

Undervoltage Lockout (UVLO)

Threshold

VIN rising

2.25 2.45 2.65

UVLO Hysteresis

100

Shutdown Supply Current

IN Operating Supply Current

Thermal-Shutdown Threshold

ENLED = ENLDO = GND TA = +25°C

TA = +85°C

Charge pump inactive,

ILED1 = ILED2 = ILED3 = ILED4 = 0.1mA

Charge pump active, VIN = 2.7V, 1MHz switching,

ILED1 = ILED2 = ILED3 = ILED4 = 0.1mA

0.5

5

0.5

65

100

1.4

160

Thermal-Shutdown Hysteresis

20

SERIAL-PULSE CONTROL

Logic Input-High Voltage (VIH)

VIN = 2.7V to 5.5V

1.4

Logic Input-Low Voltage (VIL)

VIN = 2.7V to 5.5V

0.4

Logic Input Current

VIL = 0V or VIH = 5.5V

TA = +25°C

TA = +85°C

0.01

1

0.1

tSHDN

See Figures 1 and 2 (Note 2)

2.5

tLO

See Figures 1 and 2

0.5

500

tHI

See Figures 1 and 2

0.5

500

tINIT

First high pulse from shutdown (Figures 1 and 2)

100

tHOLD

Pulse width to latch EN_ count (Figures 1 and 2) (Note 3) 2.5

CHARGE PUMP

Switching Frequency

1

Soft-Start Time

Charge-Pump Regulation Voltage

Open-Loop NEG Output

Resistance

NEG Shutdown Discharge

Resistance

(VIN - VNEG)

(VNEG - 0.5 x VIN) / INEG

All LEDs off, EN_ = GND

0.5

5

2.8

5.0

10

UNITS

V

V

mV

µA

µA

mA

°C

°C

V

V

µA

ms

µs

µs

µs

ms

MHz

ms

V

Ω

kΩ

2 _______________________________________________________________________________________

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