CAT4237

http://onsemi.com

2

Figure 1. Typical Application Circuit

L: Sumida CDRH3D16−330

D: Central CMDSH05−4 (rated 40 V)

C2: Taiyo Yuden UMK212BJ224 (rated 50 V)

VIN

CAT4237

L

D

15 W

20 mA

4.7 mF

3 V to

4.2 V

0.22 mF

FB

SW

GND

ON

33 mH

OFF

SHDN

Table 1. ABSOLUTE MAXIMUM RATINGS

Parameters

Ratings

Units

−0.3 to +7

V

SHDN voltage

−0.3 to +7

V

SW voltage

−0.3 to +55

V

Storage Temperature Range

−65 to +160

_C

Junction Temperature Range

−40 to +150

_C

Lead Temperature

300

_C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

Table 2. RECOMMENDED OPERATING CONDITIONS

Parameters

Range

Units

2.8 to 5.5

V

SW pin voltage

0 to 30

V

Ambient Temperature Range

−40 to +85

_C

6, 7 or 8 LEDs

1 to 40

mA

NOTE: Typical application circuit with external components is shown above.