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SC4505

High Efficiency Boost Converter for Backlight/Flash LED Driver

Semtech Corporation 

SC4505

POWER MANAGEMENT

Absolute Maximum Rating

Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified

in the Electrical Characteristics section is not implied. Exposure to Absolute Maximum rated conditions for extended periods of time may affect device

reliability.

Parameter

Symbol

Typ

Units

Supply Voltage

SW Voltage, Output Voltage, Current Source Voltage

I0SET Voltage

FTO Voltage

EN_BL, EN_FL, FL_TRB Voltage

Thermal Resistance Junction to Ambient

Maximum Junction Temperature

Storage Temperature Range

IR Reflow (Soldering) 10s to 30s

ESD Rating (Human Body Model)

VIN

VSW, VO, VIO1, VIO2

V V IO1SET, IO2SET

VFTO

VEN_BL, VEN_FL

VFL_TRB

θJA

TJ

TSTG

TPKG

ESD

-0.3 to 20

-0.3 to 36

-0.3 to 2

-0.3 to VIN + 0.3

-0.3 to VIN + 0.3

37

150

-65 to +150

260

1

V

V

V

V

V

°C/W

°C

°C

°C

kV

Electrical Characteristics

Unless specified: VIN = 3.6V, -40°C < TA = TJ < 85°C, , RO1SET=6.98KΩ RO2SET=1.54KΩ

Parameter

Test Conditions

Supply Input Voltage VIN

UVLO Threshold

UVLO Hysteresis

VIN Supply Current

VIN Supply Current in Shutdown

Switching Frequency

Maximum Duty Cycle

VIN rising

Not switching

EN_FL = FL_TRB = EN_BL = 0

TJ = 25°C

Minimum Duty Cycle

Switch Current Limit

Switch Leakage Current

Switch Saturation Voltage

EN_FL, FL_TRB, EN_BL

High Voltage

EN_FL, FL_TRB, EN_BL

Low Voltage

VSW = 28V

ISW = 1A

VIN = 2.6V to 4.7V

VIN = 2.6V to 4.7V

 2007 Semtech Corp.

2

Min

Typ

Max Unit

2.6

12

V

2.45

2.59

V

50

mV

1.7

mA

1.0

µA

0.8

1

85

90

1.75

2.25

0.01

1.2

MHz

%

0

%

A

1

µA

300

mV

2

V

0.4

V

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