© 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

500mA SmartLDO

Signal Sequencing

SC1545

PRELIMINARY - January 17, 2000

3

ELECTRICAL CHARACTERISTICS (Cont.)

Unless specified, 12VIN = 12V, 5VSTBY = 5V, C

Parameter

Symbol

Test Conditions

MIN

TYP

MAX

Units

VO

LDO Output Voltage

V

O

4.7V

≤ 5VSTBY ≤ 5.3V,

-1.5% 2.525 +1.5%

V

1mA

≤ I

-2.5%

+2.5%

LDO Output Voltage During

Load Transients

(1)

V

O(T)

Load step between 0mA and 500mA at

8A/µs max.

-3.0% 2.525 +3.0%

V

Time To Regulation

(2)

t

REG

5

µs

Inputs (BF_CUT & SLP)

Input Resistance

R

IN

BF_CUT = SLP = 5V

1.0

10.0

M

Ω

High Level Input Voltage

V

IH

2.0

V

Low Level Input Voltage

V

IL

0.8

V

NDR

Peak Drive Current

I

NDR(PK)

Sinking: NDR = 0.5V

Sourcing: NDR = 10V

30

mA

Output Voltage

V

NDR

Full ON, I

10

12

V

Drive Low Delay

t

DL(N)

Measured from BF_CUT threshold to

90% of NDR

150

ns

Fall Time

t

f(N)

Measured from 90% to 10%

1.0

µs

Drive High Delay

t

DH(N)

Measured from BF_CUT/SLP threshold

to 10% of NDR

300

ns

Rise Time

t

r(N)

Measured from 10% to 90%

1.0

µs

PDR

Peak Drive Current

I

PDR(PK)

Sinking: PDR = 0.5V

Sourcing: PDR = 3.5V

30

mA

Output Voltage

V

PDR

Full ON, I

3.5

5V

Drive Low Delay

t

DL(P)

Measured from BF_CUT threshold to

90% of PDR

150

ns

Fall Time

t

f(P)

Measured from 90% to 10%

1.0

µs

Drive High Delay

t

DH(P)

Measured from BF_CUT/SLP threshold

to 10% of PDR

300

ns

Rise Time

t

r(P)

Measured from 10% to 90%

1.0

µs

Overcurrent Protection

Current Limit Threshold

I

CL

V

550

mA

NOTES:

(1) The LDO will bring the output back to within the regular V

(2) External 2.5V ± 2.5% applied at output, turning off when NDR goes low. C

200mA.