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SC4503

1.3MHz Step-Up Switching Regulator with 1.4A Switch

Semtech Corporation 

SC4503

POWER MANAGEMENT

Absolute Maximum Ratings

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 recommended.

Parameter

Symbol

Maximum

Units

Supply Voltage

SW Voltage

FB Voltages

SHDN/SS Voltage

Thermal Resistance Junction to Ambient (TSOT - 23)

Thermal Resistance Junction to Ambient (2X2 mm MLPD-W)

Maximum Junction Temperature

Storage Temperature Range

Lead Temperature (Soldering)10 sec (TSOT - 23)

Peak IR Reflow Temperature (2X2mm MLPD-W)

ESD Rating (Human Body Model)

VIN

VSW

VFB

VSHDN

θ JA

θ JA

TJ

TSTG

TLEAD

TIR

ESD

-0.3 to 20

-0.3 to 34

-0.3 to VIN +0.3

-0.3 to VIN +1

191*

78*

150

-65 to +150

260

260

2000

V

°C/W

°C/W

°C

V

*Calculated from package in still air, mounted to 3” x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad as per JESD51 standards.

Electrical Characteristics

Unless specified: VIN = VSHDN/SS = 3V, -40°C < TA = TJ < 85°C

Parameter

Conditions

Min

Typ

Max

Units

Under-Voltage Lockout Threshold

2.2

2.5

Maximum Operating Voltage

20

V

Feedback Voltage

1.225 1.250 1.275

Feedback Line Voltage Regulation

FB Pin Bias Current

2.5V < VIN < 20V

0.02

%/V

-25

-50

nA

Switching Frequency

1.15 1.30 1.55 MHz

Minimum Duty Cycle

Maximum Duty Cycle

0

%

86

90

Switch Current Limit

1.4

1.9

2.5

A

Switch Saturation Voltage

Switch Leakage Current

VIN Quiescent Supply Current

VIN Supply Current in Shutdown

 2007 Semtech Corp.

ISW = 1.4A

VSW = 5V

VSHDN/SS = 2V, VFB = 1.5V (not switching)

VSHDN/SS = 0

2

260

0.01

0.8

0.01

430

mV

1

µA

1.1

mA

1

µA

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