SC652

4

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Current Transition Settling Time

t

s

0.5

s

EN/PWM Low Time

t

LT

Time that voltage on the EN/PWM pin can be low

without disabling the device

5ms

1x Mode to 1.5x Mode

Falling Transition Voltage

V

TRANS1x

I

OUT

= 50mA, I

BLn

= 10mA, V

OUT

= 3.2V

3.25

V

1.5x Mode to 1x Mode

Hysteresis

V

HYST1x

I

OUT

= 50mA, I

BLn

= 10mA, V

OUT

= 3.2V

300

mV

1.5x Mode to 2x Mode

Falling Transition Voltage

V

TRANS1.5x

I

OUT

= 50mA, I

BLn

= 10mA, V

OUT

2.9

V

2x Mode to 1.5x Mode Hysteresis

V

HYST1.5x

I

OUT

= 50mA, I

BLn

= 10mA, V

OUT

500

mV

Current Sink Off-State

Leakage Current

I

BLn(off )

V

IN

= V

BLn

= 4.2V

0.1

1

μA

Charge Pump Frequency

f

PUMP

V

IN

= 3.2V

250

kHz

Output Short Circuit Current Limit

I

OUT(SC)

OUT pin shorted to GND

45

mA

V

OUT

> 2.5V

400

Under Voltage Lockout Threshold

V

UVLO-OFF

Increasing V

IN

— lockout released

2.4

V

UVLO Hysteresis

V

UVLO-HYS

500

mV

Over-Voltage Protection

V

OVP

OUT pin open circuit, V

OUT

= V

OVP

— rising threshold

5.7

6.0

V

Over-Temperature

T

OT

Rising Temperature

165

°C

OT Hysteresis

T

OT-HYS

25

°C

V

IH

V

IN

= 5.5V

1.4

V

V

IL

V

IN

= 2.9V

0.4

V

I

IH

V

IN

= 5.5V

1

μA

I

IL

V

IN

= 5.5V

1

μA

Electrical Characteristics (continued)

Notes:

(1) Guaranteed by design

(2) Current matching equals ± [I

BL(MAX)

- I

BL(MIN

] / [I

BL(MAX)

+ I

BL(MIN)

].

(3) t

HIGH_MIN

is the minimum time needed for accurate PWM sampling.

(4) The settling time is affected by the magnitude of change in the PWM duty cycle.

(5) Test voltage is V

OUT

= 4.0V — a relatively extreme LED voltage used to force a transition during test. Typically V

OUT

= 3.2V for white LEDs.

(6) Applied to EN/PWM pin.