SC1218 データシートの表示（PDF） - Semtech Corporation

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SC1218

High Speed Synchronous MOSFET Driver

Semtech Corporation 

POWER MANAGEMENT

Pin Configuration

SOIC-8 Top View

BST

1

8

TG

CO

2

7

DRN

EN

3

6

PGND

VIN

4

5

BG

SC1218

MLPQ-8 3x3mm Top View

BST TG

8

7

CO

1

6 DRN

EN

2

5 PGND

3

4

VIN BG

EXPOSED PAD MUST BE SOLDERED TO

POWER GROUND PLANE

Pin Descriptions

SOIC-8 MLPQ-8 Pin Name

Pin Function

1

8

BST

Bootstrap supply pin for the top gate drive. Connect a 1uF ceramic capacitor between BST and

DRN pin to develop a floating bootstrap voltage for the high side driver.

2

1

CO

PWM input signal from external controller. An internal 40Kohm resistor is connected from this pin

to the PGND.

3

2

EN

When high, this pin enables the internal circuitry of the device. When low, TG and BG are forced

low.

4

3

VIN

Supply power for the bottom gate driver and the internal control circuitry. Connect to input power

rail of the converter and dcouple with a 1µF ceramic with lead length no more than 0.2" (5mm).

5

4

BG

Output gate drive for the bottom (synchronous) MOSFET. An internal 20Kohm resistor is

connected from this pin to PGND.

6

5

PGND Supply power ground return. Keep this pin close to the bottom MOSFET source during layout.

Connect this pin to the power phase node of the synchronous buck converter (source of top

MOSFET and drain of bottom MOSFET). The DRN pin provides a return path for top gate drive.

7

6

DRN Its voltage is deteced for adaptive shoot-through protection. This pin is subjected to a negative

spike of -8V relative to PGND without affecting the operation. An internal 20Kohm resistor is

connected from this pin to PGND.

8

7

TG

Output gate drive for the top (switching) MOSFET.

Ordering Information

Device

SC1218STRT (1)(3)

Package

SOIC-8

Temp Range (TJ)

0° to 150°C

SC1218MLTRT (2)(3)

MLPQ-8

0° to 150°C

Note:

(1) Only available in tape and reel packaging. A reel contains 2500 devices.

(2) Only available in tape and reel packaging. A reel contains 3000 devices.

(3) Devices are lead-free and fully WEEE and RoHS compliant.

 2005 Semtech Corp.

5

www.semtech.com

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