LM3102

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SNVS515G – SEPTEMBER 2007 – REVISED JANUARY 2012

Pin Descriptions (continued)

Pin

Ball

Name

Description

Application Information

6

C4

BST

Connection for bootstrap capacitor

Connect a 33 nF capacitor from the SW pin to this

pin. An internal diode charges the capacitor during

the main MOSFET off-time.

7

E3, E4, F1,

AGND

Analog Ground

Ground for all internal circuitry other than the

F2, F3, G3

PGND pin.

8

G2

SS

Soft-start

An 8 µA internal current source charges an

external capacitor to provide the soft- start function.

11

GND

Ground

Must be connected to the AGND pin for normal

operation. The GND and AGND pins are not

internally connected.

13

G1

FB

Feedback

Internally connected to the regulation and over-

voltage comparators. The regulation setting is 0.8V

at this pin. Connect to feedback resistors.

14

G4

EN

Enable

Connect a voltage higher than 1.26V to enable the

regulator. Leaving this input open circuit will enable

the device at internal UVLO level.

15

F4

RON

On-time Control

An external resistor from the VIN pin to this pin

sets the main MOSFET on-time.

16

E1, E2

VCC

Start-up regulator Output

Nominally regulated to 6V. Connect a capacitor of

not less than 680 nF between the VCC and AGND

pins for stable operation.

17, 18

A1, B1, C1,

PGND

Power Ground

Synchronous MOSFET source connection. Tie to a

D1

ground plane.

EP

EP

Exposed Pad

Thermal connection pad. Connect to the ground

plane.

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)

VIN, RON to AGND

-0.3V to 43.5V

SW to AGND

-0.3V to 43.5V

SW to AGND (Transient)

-2V (< 100ns)

VIN to SW

-0.3V to 43.5V

BST to SW

-0.3V to 7V

All Other Inputs to AGND

-0.3V to 7V

Human Body Model

±2kV

Storage Temperature Range

-65°C to +150°C

150°C

(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 guaranteed specifications and test conditions, see the Electrical Characteristics.

(2)

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

Ω resistor into each pin.

Operating Ratings

(1)

Supply Voltage Range (VIN)

4.5V to 42V

−40°C to +125°C

Thermal Resistance (

(2)

6.5°C/W

Thermal Resistance (

(3)

30°C/W

(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 guaranteed specifications and test conditions, see the Electrical Characteristics.

(2)

Copper Heat Sink @ 60°C.

(3)

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