SC4521 데이터 시트보기 (PDF) - Semtech Corporation

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SC4521

3A Step-Down Switching Regulator with Programmable Soft Start

Semtech Corporation 

SC4521

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 implied. Exposure to Absolute Maximum rated conditions for extended periods of time may

affect device reliability.

Parameter

Symbol

Limits

Units

Input Supply Voltage

VIN

-0.3 to +28

V

Boost Pin Above VSW

(VBST - VSW)

16

V

Boost Pin Voltage

VBST

-0.3 to +32

V

EN Pin Voltage

VEN

-0.3 to +24

V

FB Pin Voltage

VFB

-0.3 to +6

V

FB Pin Current

IFB

1

mA

SS Pin Voltage

VSS

+3

V

Thermal Impedance Junction to Ambient (1)

θJA

36.5

°C/W

Maximum Junction Temperature

TJ

150

°C

Storage Temperature Range

TSTG

-65 to +150

°C

Lead Temperature (Soldering) 10 sec

TLEAD

300

°C

ESD Rating (Human Body Model)

ESD

2

kV

Note: (1) ThetaJA is calculated from a package in still air, mounted to 3" x 4.5", 4 layer FR4 PCB with thermal vias under

exposed pad per JESD51 standards.

Electrical Characteristics

Unless specified: VIN = 12V, VCOMP = 0.8V, VBST = VIN + 5V, EN = tied to VIN, SW = open.

TA = TJ = -40°C to 125°C.

Parameter

Symbol

Conditions

Min Typ Max Units

Operating Input Voltage

Maximum Switch Current Limit

Oscillator Frequency

Switch On Voltage Drop

VIN Rising Undervoltage Lockout

VIN UVLO Hysteresis

VIN Supply Current

Standby Current

Thermal Shutdown Trip Point

VIN

ISW

fOSC

VD(SW)

VUVLO

VHYST

IQ

IQ(OFF)

TA = 25°C, D = 50%

ISW = 3A

TJ = 0°C to 85°C

VFB = 1V

VEN = 0V

24

V

3.5

5.5

A

500 600 700 kHz

220

mV

3.9 4.4

V

60

mV

3

5.5

mA

250

µA

155

°C

Thermal Shutdown Hysteresis

10

°C

 2007 Semtech Corp.

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