SC1540

SC1540A

© 2000 SEMTECH CORP.

300mA AND 500mA LOW DROPOUT

VOLTAGE REGULATORS WITH ENABLE

PRELIMINARY - May 1, 2000

652 MITCHELL ROAD NEWBURY PARK CA 91320

2

NOTES:

(1) Low duty cycle pulse testing with Kelvin connections required.

(2)

∆V

(3) Bandwidth of 10 Hz to 10kHz.

(4) 120Hz input ripple.

ELECTRICAL CHARACTERISTICS

Unless otherwise specified: I

1.5V Option: VIN = 2.9V to 7.0V

2.5 Option: VIN = 3.9V to 7.0V

3.3V Option: VIN = 4.7V to 7.0V

Values in bold apply over full operating temperature range.

Test Conditions

Test Limits

Parameter

Symbol

Min

Typ

Max

Units

Output Voltage

(1)

VO

VIN = 5V, I

0.99|VO|

VO

1.01|VO|

V

0.98|VO|

VO

1.02|VO|

Line Regulation

(1)

REG

(LINE)

I

0.035

0.2

%

Load Regulation

(1)

REG

(LOAD)

VIN = 5V

0.2

0.4

%

Dropout Voltage

(1)(2)

SC1540

SC1540A

V

D

I

I

1.10

1.30

V

Current Limit

(1)

SC1540

SC1540A

I

CL

330

550

mA

Quiescent Current

I

Q

VIN = 5V, EN = VIN

5

7

mA

10

VIN = 5V, EN < 0.25V

6

8

µA

10

Enable Pin Control Voltage

EN

Device OFF

0.25

0.45

V

Device ON

(VO+0.5)

(VO+0.8)

Enable Pin Current

I

EN

EN = 0V, VIN = 5V (OFF)

0.1

1.0

µA

EN = VIN = 5V (ON)

15

25

Temperature Coefficient

T

C

0.005

%/°C

Temperature Stability

T

S

0.5

%

RMS Output Noise

(3)

V

N

0.003

%V

O

Ripple Rejection Ratio

(4)

R

A

VIN = 5V

60

72

dB