CAT4106

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3

Figure 2. CAT4106 EN/PWM Timing

EN/PWM

LED CURRENT

DEVICE

QUIESCENT CURRENT

SHUTDOWN

POWERDOWN

SHUTDOWN

DIMMING

100% BRIGHTNESS

Table 4. ELECTRICAL OPERATING CHARACTERISTICS

Symbol

Description

Conditions

Min

Typ

Max

Units

VIN Operating Current

Switching

Not Switching

Switching

Not Switching

2.5

2.0

3.4

2.9

3.5

3.0

4.4

3.9

mA

VIN input shutdown Current

1

mA

EN/PWM

Logic High Threshold

Logic Low Threshold

Internal Pull−Down Resistor

Device Enable Level

Disable/PWM Level

0.4

100

0.8

0.7

200

1.3

300

V

V

k

W

Undervoltage lockout (UVLO)

VIN pin voltage

2.0

V

Thermal Shutdown Threshold

150

_C

Thermal Hysteresis

20

_C

RSET regulation voltage

10

1.17

1.20

1.23

V

RSET to LED Current gain ratio

30 mA LED current

100

LED Channel Dropout Voltage

0.5

V

LED Channel Matching

−5

±1

+5

%

LED Channel leakage

Channel is Off

1

mA

O/C Detect voltage threshold

1.15

1.20

1.25

V

S/C Detect voltage threshold

1.15

1.20

1.25

V

CTRL pin voltage accuracy

CTRL pin maximum load

Offset to Lowest LED output

− 0.1

25

0

+ 0.1

V

mA

Pull−down Drive Current

Open Drain Leakage Current

FAULT is Active (0.1 V bias)

FAULT is Inactive

1

2

1

mA

mA

FB Pin control voltage

FB pin input leakage current

Normal switching

mode regulation

285

300

315

1

mV

mA

SW Pin

Switching Frequency

Switch Pin Current Limit

Switch Pin On−resistance

Maximum Duty Cycle

Minimum Duty Cycle

Switch Leakage Current

Over Voltage Protection Detect

Prior to Current Limiting

Prior to Pulse−Skipping

Enters Low Power mode

0.7

0.8

1.0

1.0

1.0

96

5

40

1.3

5

MHz

A

W

%

%

mA

V

Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product

performance may not be indicated by the Electrical Characteristics if operated under different conditions.