© 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

700mA SmartLDO

TM

SC1537

PRELIMINARY - July 25, 2000

3

Parameter

Symbol

Test Conditions

MIN

TYP

MAX

Unit

VAUX (Cont.)

Reverse Leakage From VIN

I

VAUX

VIN = 5.5V, VAUX = 0V, I

-5.0

-50.0

µA

-

100.0

5V Detect

(1)(2)(3)

Low Threshold Voltage

V

TH(LO)

VIN Falling, I

3.92

4.05

4.18

V

3.90

4.20

Hysteresis

V

HYST

90

170

mV

80

High Threshold Voltage

V

TH(HI)

VIN Rising, I

4.35

V

VO

LDO Output Voltage

VO

I

3.267

3.300

3.333

V

4.75V

≤ VIN ≤ 5.25V, 0mA ≤ I

3.234

3.366

Output Current

I

O

400

mA

Line Regulation

REG

(LINE)

VIN = 4.75V to 5.25V

0.20

0.60

%

0.80

Load Regulation

REG

(LOAD)

I

0.6

1.0

%

1.2

Drive Output

Drive Voltage

V

DR

4.75V

≤ VIN ≤ 5.25V, I

3.4

VIN - 0.8

V

3.3

VIN < V

35

150

mV

250

Peak Drive Current

I

DR(PK)

Sinking: VIN = 3.9V, V

7

mA

Sourcing: VIN = 4.35V, VIN - V

6

Drive High Delay

(1)(4)

t

DH

C

0.5

1.0

µs

from VIN = V

2.0

Drive Low Delay

(1)(4)

t

DL

C

measured

0.5

1.0

µs

from VIN = V

2.0

ELECTRICAL CHARACTERISTICS

Unless specified, T

NOTES:

(1) Guaranteed by design.

(2) See 5V Detect Thresholds on page 5.

(3) Recommended source impedance for 5V supply:

≤ 0.07Ω. This will ensure that I

avoiding DR toggling during 5V detect threshold transitions.

(4) See Timing Diagram on page 5.