LSP5502

2A Synchronous Step Down DC/DC Converter

2/11

Rev. 1.7

www.liteon-semi.com

ABSOLUTE MAXIMUM RATINGS

Parameter

Value

Unit

IN Supply Voltage

-0.3 to 30

V

SW Voltage

-1 to VIN + 0.3

V

BS Voltage

VSW – 0.3 to VSW + 6

V

EN, FB, COMP Voltage

-0.3 to 6

V

Continuous SW Current

Internally limited

A

Junction to Ambient Thermal Resistance (θJA)

(Test on Approximately 3 in

2 Copper Area 1OZ copper FR4 board)

70

°C/W

Junction to Ambient Case Resistance (θJC)

20

°C/W

Maximum Power Dissipation

0.76

W

Operating Temperature

-20 to 85

°C

Storage Temperature

-55 to 150

°C

Lead Temperature (Soldering, 10 sec)

300

°C

(Note: Exceeding these limits may damage the device. Exposure to absolute maximum rating conditions for long

periods may affect device reliability.)

Recommended Operating Conditions

Symbol

Parameter

Min

Max

Unit

VIN

Input Voltage

4.5

27

V

TJ

Operating Junction Temperature Range

-20

125

oC

ELECTRICAL CHARACTERISTICS

(VIN = 12V, TA= 25°C unless otherwise specified.)

Parameter

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

Input Operating Voltage

VIN

VOUT = 1.0V, ILOAD = 0A to 2A

4.5

27

V

Input Holdup Voltage

VOUT = 1.0V, ILOAD = 0A to 2A

4.5

V

Feedback Voltage

VFB

4.5V ≤ VIN ≤ 20V

0.900

0.925

0.950

V

Feedback Overvoltage Threshold

1.1

V

High-Side Switch-On Resistance

120

mΩ

Low-Side Switch-On Resistance

120

mΩ

High-Side Switch Leakage

VEN = 0V, VSW = 0V

9

10

µA

Upper Switch Current Limit

3.5

4.0

A

Lower Switch Current Limit

0.9

A

COMP to Current Limit

Transconductance

GCOMP

5.2

A/V

Error Amplifier Transconductance

GEA

∆ICOMP = ±10µA

800

µA/V

Error Amplifier DC Gain

AVEA

480

V/V

Switching Frequency

fSW

350

400

470

kHz

Short Circuit Switching Frequency

VFB = 0

150

kHz

Maximum Duty Cycle

DMAX

VFB = 0.8V

90

%

Minimum On Time

220

nS

EN Shutdown Threshold Voltage

VEN Rising

1.1

1.3

1.5

V

EN Shutdown Threshold Voltage

Hysterisis

200

mV

EN Lockout Threshold Voltage

2.2

2.5

2.7

V

EN Lockout Hysterisis

210

mV

Free Datasheet http://www.nDatasheet.com