ISL6421

FN9130 Rev 1.00

Page 5 of 11

Jul 2004

LINEAR REGULATOR

Drop-out Voltage

Iout = 450mA (Note 4)

-

1.2

-

V

DSQIN PIN

DSQIN pin logic Low

-

-

1.5V

V

DSQIN pin Logic HIGH

3.5

-

-

V

DSQIN pin Input Current

-1-

A

CURRENT SENSE

Current Limiting Threshold (max. input)

150

200

250

mV

Input Bias Current

IBIAS

-

700

-

nA

Over Current Threshold

Static current mode, DCL = H

325

400

500

mV

ERROR AMPLIFIER

Open Loop Voltage Gain

AOL

(Note 4)

70

88

-

dB

Gain Bandwidth Product

GBP

(Note 4)

10

-

-

MHz

PWM

Maximum Duty Cycle

90

93

-

%

Minimum Pulse Width

(Note 4)

-

20

-

ns

OSCILLATOR

Oscillator Frequency

fo

Fixed at (10)(ftone)

200

220

240

kHz

THERMAL PROTECTION

Thermal Shutdown

Temperature Shutdown Threshold

(Note 4)

-

150

-

Temperature Shutdown Hysteresis

(Note 4)

-

20

-

NOTES:

3. Internal Digital Soft-start

4. Voltage programming signals VSEL and LLC are implemented via the I2C bus.

IO = 450mA.

5. Guaranteed by Design.

Electrical Specifications

VCC = 12V, TA = -20oC to +85oC, unless otherwise noted. Typical values are at TA = 25oC. EN = H, LLC = L,

ENT = L, DCL = L, DSQIN = L, IOUT = 12mA, unless otherwise noted. See software description section for I2C

access to the system. (Continued)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNITS