SC624(2007) 查看數據表（PDF） - Semtech Corporation

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SC624
(Rev.:2007)

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

Semtech Corporation 

SC624

Electrical Characteristics (continued)

Parameter

Symbol

Fault Protection (continued)

Charge Pump

V

Over-Voltage Protection

OVP

Undervoltage Lockout

V

UVLO

V

UVLO-HYS

Charge Pump Electrical Specifications

Maximum Total Output

Current

I

OUT(MAX)

Backlight Current Setting

Backlight Current Accuracy

Backlight Current Matching

1x Mode to 1.5x Mode

Falling Transition Voltage

1.5x Mode to 1x Mode

Hysteresis

1.5x Mode to 2x Mode

Falling Transition Voltage

2x Mode to 1.5x Mode

Hysteresis

Current Sink Off-State

Leakage Current

I

BL

IBL_ACC

IBL-BL

V

TRANS1x

V

HYST1x

V

TRANS1.5x

V

HYST1.5x

I

BLn

Pump Frequency

f

PUMP

LDO Electrical Specifications

LDO1 Voltage Setting

V

LDO1

LDO2 Voltage Setting

LDO1, LDO2 Output

Voltage Accuracy

V

LDO2

VV

LDO1, LDO2

Line Regulation

ΔV

LINE

Conditions

VOUT pin open circuit, VOUT = VOVP

rising threshold

Decreasing V

IN

V > 3.4V, sum of all active LED currents,

IN

V

= 4.2V

OUT(MAX)

Nominal setting for BL1 thru BL4

VIN = 3.7V, IBL = 12mA, TA = 25°C

VIN = 3.7V, IBL = 12mA(2)

I = 40mA, I = 10mA, V = 3.2V

OUT

BLn

OUT

I = 40mA, I = 10mA, V = 3.2V

OUT

BLn

OUT

I = 40mA, I = 10mA, V = 4.0V(3)

OUT

BLn

OUT

I = 40mA, I = 10mA, V = 4.0V(3)

OUT

BLn

OUT

V = V = 4.2V

IN

BLn

V = 3.2V

IN

Range of nominal settings

in 100mV increments

Range of nominal settings

in 100mV increments

V = 3.7V, I = 1mA

IN

LDO

LDO1, I = 1mA, V = 2.8V

LDO1

OUT

LDO2, I = 1mA, V = 1.8V

LDO2

OUT

Min Typ Max Units

5.3 5.7

6.0

V

2.4

V

300

mV

100

mA

0.5

25

mA

-8 ±1.5 +8

%

-3.5 ±0.5 +3.5

%

3.27

V

250

mV

2.92

V

300

mV

0.1

1

μA

250

kHz

2.5

3.3

V

1.5

1.8

V

-3.5 ±3 +3.5

%

2.1

7.2

mV

1.3

4.8

4

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