CAT3647

Doc. No. MD-5030 Rev. A

2

© Catalyst Semiconductor, Inc.

Characteristics subject to change without notice

ABSOLUTE MAXIMUM RATINGS

Parameter

Rating

Unit

VIN, LEDx, C1±, C2±, EN/DIM, RSET voltage

6

V

VOUT voltage

7

V

Storage Temperature Range

-65 to +160

°C

Junction Temperature Range

-40 to +150

°C

RECOMMENDED OPERATING CONDITIONS

Parameter

Rating

Unit

VIN

2.5 to 5.5

V

Ambient Temperature Range

-40 to +85

°C

up to 30

mA

LED Forward Voltage Range

1.3 to 4.3

V

Typical application circuit with external components is shown on page 1.

ELECTRICAL OPERATING CHARACTERISTICS

Symbol Name

Conditions

Min

Typ

Max

Units

Quiescent Current

1x mode, excluding load

1.33 x mode, excluding load

1.5x mode, excluding load

2x mode, excluding load

1.0

1.7

2.2

2.4

mA

mA

mA

mA

Shutdown Current

1

µA

RSET = 3.74kΩ

20

LED Current Setting

RSET = 7.50kΩ

10

mA

LED Current Accuracy

RSET = 4.99kΩ

±2

%

LED Channel Matching

±1.5

%

RSET Regulated Voltage

0.58

0.6

0.62

V

Output Resistance (open loop)

1x mode

0.8

5

5

10

Ω

Ω

Ω

Ω

Charge Pump Frequency

1.33x and 2x mode

1.5x mode

0.8

1

1

1.3

1.3

1.6

MHz

MHz

Output short circuit Current Limit

50

mA

Input Current Limit

250

mA

1x to 1.33x or 1.33x to 1.5x or 1.5x to 2x

Transition Thresholds at any LED pin

130

mV

1x Mode Transition Hysteresis

400

mV

Mode Transition Filter Delay

120

µs

EN/DIM Pin

• Internal Pull-down Resistor

• Logic High Level

• Logic Low Level

1.3

100

0.4

kΩ

V

V

Thermal Shutdown

150

°C

Thermal Hysteresis

20

°C

Undervoltage lockout (UVLO) threshold

1.6

1.8

2.0

V