SC643

5

Electrical Characteristics (continued)

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Digital I/O Electrical Specifications (SPIF, ENL4)

V

IH

V

IN

= 5.5V

1.6

V

V

IL

V

IN

= 2.9V

0.4

V

Input High Current

I

IH

V

IN

= 5.5V

-1

+1

μA

Input Low Current

I

IL

V

IN

= 5.5V

-1

+1

μA

SemPulse Electrical Specifications (SPIF)

t

SU

1ms

t

HI

0.75

250

μs

t

LO

0.75

250

μs

t

HOLDA

SPIF is held high

500

5000

μs

t

HOLDD

SPIF is held high

500

μs

t

BR

SPIF is held high

10

ms

t

SD

SPIF is pulled low

10

ms

Fault Protection

Output Short Circuit Current Limit

I

OUT(SC)

OUT pin shorted to GND

300

mA

Over-Temperature

T

OTP

Rising threshold

165

°C

T

HYS

Hysteresis

30

°C

Charge Pump

Over-Voltage Protection

V

OVP

OUT pin open circuit, V

OUT

= V

OVP

5.7

6.0

V

Under Voltage Lockout

V

UVLO

Decreasing V

IN

2.4

V

V

UVLO-HYS

300

mV

Notes:

(1)

Capacitors are MLCC of X5R type. Production tested with higher value capacitors than the application requires.

(2)

SPIF is high for more than 10ms

(3)

Subscript for all backlights (BLn), n = 1, 2, 3, 4 and 5. Subscripting for all LDOs (LDOn), n = 1, 2, 3, 4.

(4)

Current matching is defined as ± [I

BL(MAX)

- I

BL(MIN)

] / [I

BL(MAX)

+ I

BL(MIN)

].

(5)

Test voltage is V

OUT

=4.2V — a relatively extreme LED voltage — to force a transition during test. Typically V

OUT

=3.2V for white LEDs.

(6)

Subscript m = 1, 3, and 4 and applies only to LDO1, LDO3, and LDO4.

(7)

X5R or better “temperature stable” MLCC capacitor.

(8)

The source driver used to provide the SemPulse output must meet these limits.

(9)

The SemPulse start-up time is the minimum time that the SPIF pin must be held high to enable the part before commencing

communication.

(10) The SemPulse shutdown time is the minimum time that the SPIF pin must be pulled low to shut the part down.