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SS7529

Rev.1.01 4/26/2004

PIN DESCRIPTIONS

PIN

NAME

FUNCTION

1

LGATE

Connect LGATE pin to the PWM converter’s lower MOSFET gate. This pin provides the gate

drive for the lower MOSFET.

2

PGND

Power ground

return

3

GND

Signal and power ground for the IC. All voltage levels are measured with respect to this pin.

4

5VCC

Connect this pin to 5V supply voltage. This pin provides the bias for the control circuitry. The

voltage at this pin is monitored for Power-On Reset (POR) purposes.

5

DRIVE2

This pin is the output of the linear controller. Connect this pin to the gate of an external

N-MOSFET to provide output power.

6

FB2

This pin is the inverting input of the internal error amplifier for the linear regulator output. Connect

this pin to the output of the converter via an external resistor divider.

7

NC

Not connected

8

NC

Not connected

9

FB

This pin is the inverting input of the internal error amplifier for the switching buck converter.

Connect this pin to the output of the converter via an external resistor divider.

10

COMP

Error amplifier output

11

NC

Not connected

12

NC

Not connected

13

12VCC

Connect this pin to the 12V supply voltage. This pin provides the bias for the driver circuitry. The

voltage at this pin is monitored for Power-On Reset (POR) purposes.

14

UGATE

Connect the UGATE pin to the PWM converter’s upper MOSFET gate. This pin provides the gate

drive for the upper MOSFET.

ABSOLUTE MAXIMUM RATINGS

-0.3 ~ 14V

UGATE, LGATE, DRIVE2 …………………………………………………………………

-0.3 ~12Vcc

FB, FB2, COMP ……………………………………………………………………………

-0.3 ~ 5Vcc+0.3

Operating Temperature Range………………………………………………..…………

0

Storage Temperature Range………………………………………………………..……

–65

Junction Temperature………………………………………………………….…………

0

Package thermal resistance SO-14.……………………………………………………

68

Lead temperature (Soldering, 10sec)…………………………………………………..

300

Caution:

Stresses beyond the ratings specified in “Absolute Maximum ratings” may cause permanent damage to the device. This

is a stress-only rating and the device should not be operated at these, or any other conditions above those indicated in the

operational sections of this specification.

ELECTRICAL CHARACTERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Vcc Supply Voltage

12Vcc

10.8

12

13.2

V

5Vcc

4.5

5.0

5.5

V

Vcc Supply Current

Nominal Supply Current 12Vcc

UGATE and LGATE open

1.3

mA

Nominal Supply Current 5Vcc

UGATE and LGATE open

1.0

mA