High-Efficiency Step-Up

Current Regulator for LEDs

2

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

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.

GND to PGND.....................................................................±0.3V

10-Pin µMAX (derate 5.6mW/°C above +70°C) ............444mW

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

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

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

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

FB = GND, ADJ = REF, CS = GND

FB = GND, ADJ = REF

Rising edge

FB = GND

ADJ = REF

CONDITIONS

mV

30

50

70

ADJ Start Threshold

µs

10

15

20

Maximum On Time

µs

0.8

1.0

1.2

Minimum Off Time

0.8

CS Input Current

A

0.8

1.5

2.5

CS Trip Current

V

2.25

2.4

2.55

Undervoltage Lockout

µA

260

500

V

2.7

5.5

Supply Voltage

Quiescent Supply Current

mV

80

Undervoltage Hysteresis

285

300

315

mV

18

24

30

FB Regulation Voltage

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

nA

-15

15

FB Input Bias Current

V

0.03

REF

ADJ Input Range

ADJ Input Bias Current

ADJ = REF

-50

50

nA

Shutdown Supply Current

SHDN = GND

0.01

1

µA

REF Output Voltage

1.20

1.25

1.30

V

REF Load Regulation

-2

-25

mV

REF Short-Circuit Current

REF = GND

0.45

1

mA

REF Power-Supply Rejection

Ratio

PSRR

+0.3

+2

mV/V

EXT Driver Sink/Source Current

0.2

A

EXT Driver On-Resistance

8

Ω

SHDN Input High Voltage

2

V

SHDN Input Low Voltage

0.8

V

SHDN Input Bias Current

-1

1

µA