CAT4137 datasheet(2/14 Pages) CATALYST

部品番号	CAT4137

部品情報	CMOS Boost Converter - White LED Driver

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メーカー	CATALYST [Catalyst Semiconductor]

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CAT4137

Doc. No. MD-5012 Rev. B

2

Characteristics subject to change without notice

ABSOLUTE MAXIMUM RATINGS

Parameter

Rating

Unit

VIN, FB voltage

-0.3 to +7

V

SHDN

¯¯¯¯¯ voltage

-0.3 to +7

V

SW voltage

-0.3 to 40

V

Storage Temperature Range

-65 to +160

°C

Junction Temperature Range

-40 to +150

°C

Lead Temperature

300

°C

RECOMMENDED OPERATING CONDITIONS

Parameter

Range

Unit

VIN

2.2 to 5.5

V

SW pin voltage

0 to 24

V

Ambient Temperature Range

-40 to +85

°C

LED Bias Current

1 to 30

mA

ELECTRICAL OPERATING CHARACTERISTICS

VIN = 3.6V, ambient temperature of 25ºC (over recommended operating conditions unless specified otherwise)

Symbol Parameter

Conditions

Min

Typ

Max

Unit

IQ

Operating Current

VFB = 0.3V

VFB = 0.4V (not switching)

0.4

0.1

1.5

0.3

mA

ISD

Shutdown Current

VSHDN

¯¯¯¯¯ = 0V

0.1

1

µA

VFB

FB Pin Voltage

3 LEDs with ILED=20mA

285

300

315

mV

IFB

FB pin input leakage

0.1

1

µA

ILED

Programmed LED Current

R1 = 10Ω

R1 = 15Ω

R1 = 20Ω

28.5

19

14.25

30

20

15

31.5

21

15.75

mA

VIH

VIL

SHDN

¯¯¯¯¯ Logic High

SHDN

¯¯¯¯¯ Logic Low

Enable Threshold Level

Shutdown Threshold Level

0.4

0.8

0.7

1.5

V

FSW

Switching Frequency

0.7

1

1.3

MHz

ILIM

Switch Current Limit

250

300

400

mA

RSW

Switch “On” Resistance

ISW = 100mA

1.0

2.0

Ω

ILEAK

Switch Leakage Current

Switch Off, VSW = 5V

1

5

µA

TSD

Thermal Shutdown

150

ºC

THYS

Thermal Hysteresis

20

ºC

η

Efficiency

Typical Application Circuit

86

%

VUVLO

Under-voltage lock out

(UVLO) threshold

1.9

V

VOV-SW

Output Clamp Voltage

“Open LED” fault

29

V

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