SC1405D View Datasheet(PDF) - Semtech Corporation

Part Name

Description

Manufacturer

SC1405D

High Speed Synchronous Power MOSFET Smart Driver

Semtech Corporation 

SC1405D

POWER MANAGEMENT

Pin Configuration

Top View

Ordering Information

Device

SC1405DITSTRT

Package

TSSOP-14

Temp Range (TJ)

-40° to 125°C

Notes:

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

contains 2500 devices.

(2) Lead free product. This product is fully WEEE and

RoHS compliant.

(14-Pin TSSOP)

Pin Descriptions

Pin #

Pin Name

Pin Function

1

OVP_S

Overvoltage protection sense. External scaling resistors required to set protection

threshold.

2

EN

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

PRDY are forced low and the supply current (5V) is less than 10µA.

3

GND

Logic GND.

4

CO

TTL-level input signal to the MOSFET drivers.

5

S_MOD

When low, this signal forces BG to be low, triggering asynchronous operation. When

high, BG is not a function of this signal.

6

DELAY_C

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

delay for BG going low to TG going high. Total propagation delay =20ns + 1ns/pF. If no

capacitor is connected, the propragation delay = 20ns.

7

PRDY

This pin indicates the status of VCC. When VCC is less than the UVLO threshold, this

output is driven low. When VCC is greater than or equals to the UVLO threshold this

output goes high.

8

VCC

Input supply of 5 - 8V. A .22-1µF ceramic capacitor should be connected from VCC to

PGND very close to the chip.

9

BG

Output drive for the synchrounous (bottom) MOSFET.

10

PGND

Power ground. Connect to the synchronous FET source pin (power ground).

11

DSPS_DR

Dynamic Set Point Switch Drive. TTL level output signal. When S-MOD is high, this pin

follows the BG driver pin voltage.

12

DRN

This pin connects to the junction of the switching and synchronous MOSFET's. This pin

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

13

TG

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

14

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).

NOTE:

(1) All logic level inputs and outputs are open collector TTL compatible.

 2005 Semtech Corp.

6

www.semtech.com

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