SC420AIMLTRT 데이터 시트보기 (PDF) - Semtech Corporation

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SC420AIMLTRT

High Speed, Combi-Sense™, Synchronous Power MOSFET Driver for Mobile Applications

Semtech Corporation 

SC420A

POWER MANAGEMENT

Pin Configuration

Top View

12 11 10

TG 1

BST 2

CO 3

4

5

6

9 BG

8 VIN

7 CDELAY

Ordering Information

Device (1)

SC420AIMLTRT(3)

Package

MLP-12

Temp Range (TJ)

-40° to 125°C

Note:

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

contains 3000 devices.

(2) This device is ESD sensitive. Use of standard ESD

handling precautions is required.

(3) Lead Free package compliant with J-STD-020B.

Qualified to support maximum IR reflow temperature of

260oC for 30 seconds.

(MLP-12)

Pin Descriptions

Pin Pin

# Name

Pin Function

1

TG Output gate drive for the switching (high-side) MOSFET.

2

BST

Bootstrap pin. A capacitor is connected between BST and DRN pins to develop the floating bootstrap

voltage for the high-side MOSFET. The capacitor value is typically between 0.1µF and 1µF (ceramic).

3

CO Logic level PWM input signal to the SC420 supplied by external controller.

4

VIN2

Input power (VBAT) to the DC/DC converter. Used as supply reference for internal Combi-Sense TM

circuitry. Connect as close as possible to Drain of TOP switching MOSFET.

5

EN

Active high logic level input signal. A logic High enables TG and BG switching. A low level disables

outputs and reduces quiescent current to IQ SD

6

VPN

Virtual Phase Node. Connect an RC between this pin and the output sense point to Enable Combi-

Sense TM operation.

The capacitance connected between this pin and GND sets the additional propagation delay for BG

7 CDELAY going low to TG going high. Total propagation delay =20ns + 1ns/pF. If no capacitor is connected, the

propragation delay = 20ns.

8

VIN

Input supply for the bottom drive and the Logic. A 1µF-10µF Ceramic Capacitor must be connected

from this pin to PGND, placed less than 0.5" from SC420.

9

BG Output drive for the synchronous (bottom) MOSFET.

10 PGND Ground. Keep this pin close to the synchronous MOSFETs source.

11 N.C. No Connect

12

DRN

This pin connects to the junction of the switching and synchronous MOSFETs . This pin can be subjected

to a -2V minimum relative to PGND without affecting operation.

© 2004 Semtech Corp.

5

United States Patent No. 6,441,597

www.semtech.com

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