PRODUCT SPECIFICATION

FAN5236

4

REV. 1.1.7 4/4/03

Absolute Maximum Ratings

Absolute maximum ratings are the values beyond which the device may be damaged or have its useful life

impaired. Functional operation under these conditions is not implied.

Recommended Operating Conditions

Note 1: Industrial temperature range (–40 to + 85°C) may be special ordered from Fairchild. Please contact your authorized Fairchild

representative for more information.

14

VIN

Input Voltage. Normally connected to battery, providing voltage feed-forward to set the

amplitude of the internal oscillator ramp. When using the IC for 2-step conversion from 5V

input, connect through 100K to ground, which will set the appropriate ramp gain and

synchronize the channels 90˚ out of phase.

15

PG1

Power Good Flag. An open-drain output that will pull LOW when VSEN is outside of a

±10% range of the 0.9V reference.

16

PG2 /

REF2OUT

Power Good 2. When not in DDR Mode: Open-drain output that pulls LOW when the

VOUT is out of regulation or in a fault condition

Reference Out 2. When in DDR Mode, provides a buffered output of REF2. Typically

used as the VDDQ/2 reference.

18

ILIM2 /

REF2

Current Limit 2. When not in DDR Mode, A resistor from this pin to GND sets the current

limit.

Reference for reg #2 when in DDR Mode. Typically set to VOUT1 / 2.

28

VCC

VCC. This pin powers the chip as well as the LDRV buffers. The IC starts to operate when

voltage on this pin exceeds 4.6V (UVLO rising) and shuts down when it drops below 4.3V

(UVLO falling).

Parameter

Min.

Typ.

Max.

Units

VCC Supply Voltage:

6.5

V

VIN

27

V

BOOT, SW, ISNS, HDRV

33

V

BOOTx to SWx

6.5

V

All Other Pins

–0.3

VCC+0.3

V

–40

150

°C

Storage Temperature

–65

150

°C

Lead Soldering Temperature, 10 seconds

300

°C

Parameter

Conditions

Min.

Typ.

Max.

Units

Supply Voltage VCC

4.75

5

5.25

V

Supply Voltage VIN

24

V

Note 1

–10

85

°C