7

FN9190.1

April 10, 2007

TXT1 AND TXT2, EXTM1 AND EXTM2, SELVTOP1 AND SELVTOP2, ADDR0 AND ADDR1 INPUT PINs (Note 8)

Asserted LOW

0.8

V

Asserted HIGH

1.7

V

Input Current

25

μA

CURRENT SENSE (CS pin)

Input Bias Current

700

nA

Overcurrent Threshold

Static current mode, DCL = H

325

450

500

mV

ERROR AMPLIFIER

Open Loop Voltage Gain

88

dB

Gain Bandwidth Product

GBP

14

MHz

PWM

Maximum Duty Cycle

90

93

%

Minimum Pulse Width

20

ns

OSCILLATOR

Oscillator Frequency

396

440

484

kHz

Thermal Shutdown

Temperature Shutdown Threshold

150

°C

Temperature Shutdown Hysteresis

20

°C

FLT

FLT (released)

10

µA

FLT (asserted)

ISINK = 3.2mA (1.5k pull-up resistor to 5V)

0.4

V

NOTES:

5. Internal digital soft-start.

6. The EXTM1 and EXTM2, SELVTOP1 and SELVTOP2, TXT1 and TXT2, and ADDR0 and ADDR1 pins have 200k internal pull-downs.

bit is set. The dynamic back current limit duty during a BCF is ON = 100µs or OFF = 5ms.

8. In the dynamic back current limit mode, the output is ON for 20ms and OFF for 900ms, but remains continuously ON in the Static mode. When

tone is ON, the minimum current limit is 50mA lower than the values indicated in the table. While in the dynamic mode of current limit, the trip

level is momentarily increased to 990mA during the 20ms ON time to facilitate recovery from overload conditions.

Electrical Specifications

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNITS

ISL6422