SC624 Ver la hoja de datos (PDF) - Semtech Corporation

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Fabricante

SC624

LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs, and SemWire™ Interface

Semtech Corporation 

SC624

Electrical Characteristics (continued)

Parameter

Symbol

Conditions

Min Typ Max Units

LDO Electrical Specifications (continued)

Load Regulation

ΔV

LOAD

V = 3.3V, V = 3.7V,

LDO1

IN

I = 1mA to 100 mA

LDO1

V = 1.8V, V = 3.7V,

LDO2

IN

I = 1mA to 100 mA

LDO2

Dropout Voltage(4)

V

I = 100mA

100

D

LDO1

Current Limit

Power Supply

Rejection Ratio

Output Voltage Noise

Minimum Output Capacitor

I

200

LIM

PSRR

2.5V < VLDO1 < 3V, f < 1kHz, CBYP = 22nF, ILDO1 = 50mA,

50

LDO1

V = 3.7V with 0.5V ripple

IN

P-P

PSRR

f < 1kHz, CBYP = 22nF, ILDO2 = 50mA,

60

LDO2

V = 3.7V with 0.5V ripple

IN

P-P

e

LDO1, 10Hz < f < 100kHz, CBYP = 22nF, CLDO = 1μF,

100

n-LDO1

I = 50 mA, V = 3.7V, 2.5V < V < 3V

LDO1

IN

LDO1

LDO2, 10Hz < f < 100kHz, C = 22nF, C = 1μF,

e

BYP

LDO

50

n-LDO2

I = 50 mA, V = 3.7V

LDO2

IN

C

1

LDO(MIN)

Digital I/O Electrical Specifications (SWIF)

25

mV

20

150

mV

mA

dB

μV

RMS

μF

Input High Threshold

V

IH

V = 5.5V

1.6

V

IN

Input Low Threshold

V

IL

V = 3.0V

IN

0.4

V

Input High Current

I

IH

V = 5.5V

IN

-1

+1

μA

Input Low Current

I

IL

V = 5.5V

IN

-1

+1

μA

SemWire Bit Rate

f

SWIF

10

75 kbit/s

SemWire Start-up Time(5)

tEN

1

ms

SemWire Disable Time(6)

t

DIS

10

ms

SemWire Data Latch Delay(7)

D

DL

5

bit

Notes:

(1) ΔV is the voltage difference between any two LEDs.

F

(2) Current matching equals ± [I - I ] / [I + I ].

BL(MAX) BL(MIN

BL(MAX) BL(MIN)

(3) Test voltage is V = 4.0V — a relatively extreme LED voltage — to force a transition during test. Typically V = 3.2V for white LEDs.

OUT

OUT

(4) Dropout is defined as (VIN- VLDO1) when VLDO1 drops 100mV from nominal. Dropout does not apply to LDO2 since it has a maximum output voltage

of 1.8V.

(5) The SemWire start-up time is the minimum period that the SWIF pin must be held high to enable the part before commencing

communication.

(6) The SemWire disable time is the minimum period that the SWIF pin must be pulled low to shut the part down.

(7) The SemWire data latch delay is the maximum duration after communication has ended before the register is updated.

5

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