SC446

4

© 2010 Semtech Corporation

www.semtech.com

Electrical Characteristics (continued)

Notes:

(1) Guaranteed by design.

(2) For achievable PWM dimming minimum pulse-width in applications, see the corresponding curves in Typical Characteristics.

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Control Signals

EN, PWM High Voltage

V

2

V

EN, PWM Low Voltage

V

0.4

V

EN, PWM Leakage Current

I

V

0.1

1

µA

F

Dimming

50

50k

Hz

PWM Dimming Minimum Duty Cycle

D

MIN_Dimming

F

0.2

%

T

MIN_Dimming

5

µs

PWM Dimming Minimum Off Time

T

MIN_Off

200

300

ns

FFLAG Voltage

V

FFLAG

I

0.25

V

SS Source Current

I

SS_SOURCE

V

4.5

µA

SS Sink Current

I

SS_SINK

V

1

SS Switching Threshold

V

SS_Switching

V

0.5

0.7

0.85

V

SS End Value

V

SS_END

V

2.5

V

Over-Voltage Protection

OVPIN Threshold

V

OVPIN_TH

OVPIN - AGND

1.43

1.52

1.58

V

OVPIN Leakage Current

I

OVPIN

V

0.1

1

µA

OVPRTN Saturation Voltage

V

OVPRTN

I

60

mV

OVPRTN Leakage Current

I

OVPRTN

V

0.1

µA

VOUT Internal Pull-down Current Source

I

OVP

V

0.9

mA

VOUT Leakage Current

I

V

0.1

µA

Current Source (IO1 ~IO3 )

Current Accuracy

I

T

93

100

107

mA

Current Matching

T

+/- 2

+/-3

%

Maximum LED Current

I

OMAX

150

mA

LED Short-Circuit Protection

V

IO_SCP

T

2.2

2.35

2.55

V

Leakage Current

I

IO_LEAK

EN = 0, V

0.1

1

µA

Overshoot Protection Threshold

V

T

0.963

1.07

1.177

V

0.9065

1.07

1.2305

V

Overshoot Protection Hysteresis

Any of I

100

mV

Over-Temperature Protection

Thermal Shutdown Temperature

T

OTP

150

°C

Thermal Shutdown Hysteresis

T

OTP_H

30

°C