SC1409

© 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

1 A Synchronous Switching Regulator

June 28, 2000

2

ABSOLUTE MAXIMUM RATINGS

Parameter

Symbol

Maximum

Units

Supply Voltage

V

CC

-0.3 to +7

V

Ground Differential

P

± 1

V

Input Voltage

V

IN

-0.3 to +7

V

Operating Ambient Temperature Range

T

A

-40 to +85

°C

Operating Junction Temperature Range

T

J

-40 to +125

°C

Storage Temperature

T

STG

-60 to +150

°C

Lead Temperature (Soldering) 10 seconds

T

L

300

°C

Thermal Resistance, Junction to Ambient

θ=

JA

165

°C/W

Thermal Resistance, Junction to Case

θ=

JC

40

°C/W

ESD Rating (Human Body Model)

ESD

2

kV

ELECTRICAL CHARACTERISTICS

Unless specified; T

Values in bold apply over full operating temperature range.

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Reference

V

REF

1.191

1.203

1.215

V

1.179

1.227

Feedback Bias Current

I

FB

10.0

50.0

nA

Quiescent Current

I

Q

Current into V

2.0

4.0

mA

Io=0mA

15

Shutdown Quiescent Current

I

Q

Enable = 0V

5.0

uA

10

Regulation Load

REG

LOAD

I

0.5

1.0

%

Regulation Line

REG

LINE

0.5

%

Oscillator Frequency

OSC

FSET=Vin

FSET=GND

425

255

500

300

575

345

kHz

kHz

Max Duty Cycle

δ

max

90

95

%

Output Current Limit

I

O

1.5

A

Soft start charging current

32

uA

EN/SS Shutdown Threshold

1.0

V

UVLO Trip point

Vin Increasing

Vin decreasing

4.5

4.1

V

V

RDS(ON)

R

DS(ON)

Top side PFET

250

375

m

Ω

525

Bottom side NFET

175

250

m

Ω

350