CAT4201

http://onsemi.com

2

Table 1. ABSOLUTE MAXIMUM RATINGS

Parameters

Ratings

Units

VBAT, SW, CTRL

−0.3 to +40

V

RSET

−0.3 to +5

V

Switch SW peak current

1

A

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

Ratings

Units

VBAT voltage (Notes 1, 2)

6.5 to 36 (Note 1)

V

SW voltage

0 to 36

V

Ambient Temperature Range

−40 to +125

_C

LED Current

50 to 350

mA

Switching Frequency

50 to 1000

kHz

1. The VBAT pin voltage should be at least 3 V greater than the total sum of the LED forward voltages in order to operate at nominal LED current.

2. During power−up, the slew rate of the input supply should be greater than 1 ms for every 5 V increase of VBAT.

Table 3. ELECTRICAL CHARACTERISTICS

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Operating Supply Current on VBAT pin

0.4

1

mA

Idle Mode Supply Current on VBAT pin

CTRL = GND

90

mA

RSET Pin Voltage

1.15

1.2

1.25

V

Programmed LED Current

R1 = 33 kW

R1 = 10 kW

R1 = 8.25 kW

270

100

300

350

330

mA

CTRL Voltage for 100% Brightness

2.6

3.1

V

CTRL Voltage to Enable LEDs

LED enable voltage threshold

0.9

1.2

V

CTRL Voltage to Shutdown LEDs

LED disable voltage threshold

0.4

0.9

V

CTRL pin input bias

40

200

80

mA

Switch “On” Resistance

0.9

1.5

W

Thermal Shutdown

150

°C

Thermal Hysteresis

20

°C

h

Efficiency

Typical Application Circuit

86

%