6

FN9070.5

April 12, 2005

Functional Pin Descriptions

LGATE (Pin 1), (Pin 16 QFN)

Lower gate drive output. Connect to gate of the low-side

MOSFET.

PGND (Pin 2), (Pin 1 QFN)

This pin is the power ground return for the lower gate driver.

GND (Pin 3), (Pin 2 QFN)

Signal ground for the IC. All voltage levels are measured

with respect to this pin. Place via close to pin to minimize

impedance path to ground plane.

5VCC (Pin 4), (Pin 3 QFN)

Provide a well decoupled 5V bias supply for the IC to this

pin. The voltage at this pin is monitored for Power-On Reset

(POR) purposes.

DRIVE2 (Pin 5), (Pin 4 QFN)

Connect this pin to the gate terminal of an external

N-Channel MOSFET transistor. This pin provides the gate

voltage for the linear regulator pass transistor. It also

provides a means of compensating the error amplifier for

applications where the user needs to optimize the regulator

transient response.

COMP Low Output, Sink Current

2.5

3.5

-

mA

-

51.5

-

%

PWM CONTROLLER GATE DRIVERS

UGATE and LGATE Maximum Voltage

12VCC = 12V

11

12

-

V

UGATE and LGATE Minimum Voltage

12VCC = 12V

-

0

0.5

V

UGATE and LGATE Source Current

12VCC = 12V

-

-1

-

A

UGATE and LGATE Sink Current

12VCC = 12V

-

1

-

A

UGATE and LGATE OUTPUT IMPEDANCE

12VCC = 12V

-

3.1

4.3

Ω

LINEAR REGULATOR (DRIVE2)

DC Gain

-

80

-

dB

Gain-Bandwidth Product

GBWP

-

15

-

MHz

Slew Rate

SR

-

6

-

V

/µs

FB2 Input Current

-

20

150

nA

Drive2 High Output Voltage

9.5

10.3

-

V

Drive2 Low Output Voltage

-

0.1

1.0

V

Drive2 High Output Source Current

-0.7

-1.4

-

mA

Drive2 Low Output Sink Current

0.85

1.2

-

mA

Percent of Nominal

-

160

-

%

Percent of Nominal

-

51.5

-

%

REGULATOR ISOLATION

Change in Linear Regulator Output Voltage

(Note 4)

∆Vout

Linear Output = 2.5V, 6A Load Change on PWM

-

<0.5

-

%

Change in PWM Regulator Output Voltage

(Note 4)

∆Vout

PWM Output = 1.5V, 1A Load Change on Linear

-

<0.5

-

%

NOTE:

4. Measured in the evaluation board.

Electrical Specifications

Recommended Operating Conditions, Unless Otherwise Noted. Refer to Block and Simplified Power System

Diagrams, and Typical Application Schematic (Continued)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNITS

5VCC

GND

DRIVE2

FB2

UGATE

FB

COMP

LGATE

14

13

12

11

1

2

3

4

10

9

8

5

6

7

12VCC

PGND

NC

NC = NO INTERNAL

NC

NC

NC

CONNECTION

ISL6529, ISL6529A