LM3488

LM3488-Q1

SNVS089M – JULY 2000 – REVISED MARCH 2013

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Connection Diagram

Figure 2. 8-Lead VSSOP Package

PIN DESCRIPTIONS

Pin Name

Pin

Description

No.

1

Current sense input pin. Voltage generated across an external sense resistor is fed into this pin.

COMP

2

Compensation pin. A resistor, capacitor combination connected to this pin provides compensation for the control

loop.

FB

3

Feedback pin. The output voltage should be adjusted using a resistor divider to provide 1.26V at this pin.

AGND

4

Analog ground pin.

PGND

5

Power ground pin.

DR

6

Drive pin of the IC. The gate of the external MOSFET should be connected to this pin.

FA/SYNC/SD

7

Frequency adjust, synchronization, and Shutdown pin. A resistor connected to this pin sets the oscillator

frequency. An external clock signal at this pin will synchronize the controller to the frequency of the clock. A high

level on this pin for

≥ 30µs will turn the device off. The device will then draw less than 10µA from the supply.

8

Power supply input pin.

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Absolute Maximum Ratings

(1)

Input Voltage

45V

FB Pin Voltage

FA/SYNC/SD Pin Voltage

Peak Driver Output Current (<10µs)

1.0A

Power Dissipation

Internally Limited

Storage Temperature Range

−65°C to +150°C

Junction Temperature

+150°C

ESD Susceptibilty

2kV

Lead Temperature

Vapor Phase (60 sec.)

215°C

Infared (15 sec.)

260°C

DR Pin Voltage

−0.4V ≤ VDR ≤ 8V

600mV

(1)

Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which

operation of the device is intended to be functional. For specifications and test conditions, see the Electrical Characteristics.

(2)

The human body model is a 100 pF capacitor discharged through a 1.5k

Ω resistor into each pin.

2

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