Datasheet

LM3488
LM3488-Q1
SNVS089M –JULY 2000–REVISED MARCH 2013 www.ti.com
Connection Diagram
Figure 2. 8-Lead VSSOP Package
PIN DESCRIPTIONS
Pin Name Pin Description
No.
I
SEN
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.
V
IN
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 -0.4V < V
FB
< 7V
FA/SYNC/SD Pin Voltage -0.4V < V
FA/SYNC/SD
< 7V
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 Human Body Model
(2)
2kV
Lead Temperature Vapor Phase (60 sec.) 215°C
Infared (15 sec.) 260°C
DR Pin Voltage −0.4V ≤ VDR ≤ 8V
I
LIM
Pin Voltage 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 1.5kΩ resistor into each pin.
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