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PT6937 V1.1

- 11 -

March, 2006

White LED Step-Up Converter

PT6937

ABSOLUTE MAXIMUM RATINGS

Parameter

Symbol

Rating

Unit

Input voltage

VIN

5

V

SW voltage

33

V

FB voltage

5

V

/SHDN voltage

5

V

Operating temperature

Topr

-40 to +85

℃

Storage temperature

Tstg

-65 to +150

℃

Maximum junction temperature

125

℃

Lead temperature (Soldering, 10 sec.)

300

℃

Note:

Absolute Maximum Ratings are those values beyond which the life of the device may be impaired.

ELECTRICAL CHARACTERISTICS

(unless otherwise specified, Ta=25℃, VIN=3V, V /SHDN=3V,.

Parameter

Conditions

Min.

Typ.

Max.

Unit

Minimum operating voltage

2.5

V

Maximum operating voltage

5.5

V

Feedback voltage

ISW=100mA, Duty cycle=66%

86

95

104

mV

FB pin bias current

5

10

nA

Supply current

/SHDN=0V

0.8

0.1

1.2

1.0

mA

µA

Switching frequency

0.8

1.2

1.6

MHz

Maximum duty cycle

84

87

90

%

Switch current limit

300

350

400

mA

Switch VCESAT

ISW=250mA

350

380

mV

Switch leakage current

VSW=30V

0.1

1

µA

/SHDN voltage high

1.3

-

-

V

/SHDN voltage low

0.5

V

/SHDN pin bias current

20

30

µA

Note:

The PT6937 is guaranteed to meet specifications from 0℃ to 70℃. Specifications over the -40℃ to

85℃ operating temperature range are assured by design, characterization and correlation with

statistical process controls.