SC1405BTS.TR Semtech Corporation, SC1405BTS.TR Datasheet

SC1405BTS.TR

Manufacturer Part Number

SC1405BTS.TR

Description

SC1405BTS.TRHigh Speed Synchronous Power MOSFET Smart Driver

Manufacturer

Semtech Corporation

Datasheet

1.SC1405BTS.TR.pdf (14 pages)

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The SC1405B is a Dual-MOSFET Driver with an internal

Overlap Protection Circuit to prevent shoot-through. Each

driver is capable of driving a 3000pF load in 15ns rise/

fall time and has ULTRA-LOW propagation delay from in-

put transition to the gate of the power FET’s. Adaptive

Overlap Protection circuit ensures that the synchronous

FET does not turn on until the top FET source has reached

a voltage low enough to prevent shoot-through. The de-

lay between the bottom gate going low to the top gate

transitioning high is externally programmable via a ca-

pacitor to minimize dead time. The bottom FET may be

disabled at light loads by keeping S_MOD low to trigger

asynchronous operation, thus saving the bottom FET’s

gate drive current and inductor ripple current. An inter-

nal voltage reference allows threshold adjustment for

an Output Over-Voltage protection circuitry, independent

of the PWM controller.

Under-Voltage-Lock-Out circuit is included to guarantee

that both driver outputs are off when Vcc is less than or

equal to 4.4V (typ) at supply ramp up (4.35V at supply

ramp down). A CMOS output provides status indication

of the 5V supply. A low enable input places the IC in stand-

by mode, reducing supply current to less than 10µA.

SC1405B is offered in a high pitch (.025” lead spacing)

TSSOP package.

POWER MANAGEMENT

Revision: January 13, 2004

Description

Typical Application Circuit

<<< Output Feedback to PWM

(20KHz-1MHz)

Controller

DSPS_DR

INPUT POWER, 5-20V

P_READY

PWM IN

10uF,6.3V

Vcc

47pF

.1uF

Over-Voltage Sense

SC1405

5817

Features

Applications

.22uF

High Speed Synchronous Power

Fast rise and fall times (15ns with 3000pf load)

14ns max. Propagation delay (BG going low)

Adaptive and programmable shoot-through

protection

Wide input voltage range (4.5-25V)

Power saving asynchronous mode control

Output overvoltage protection/overtemp shutdown

Under-Voltage lock-out and power ready signal

Less than 10µA stand-by current (EN=low)

Improved drive version of SC1405TS

High frequency (to 1.2MHz) operation allows use of

small inductors and low cost capacitors in place of

electrolytics

High Density/Fast transient microprocessor power

supplies

Motor Drives/Class-D amps

High efficiency portable computers

2.2

MTB75N03

75A,30V

MTB75N03

75A,30V

MOSFET Smart Driver

1.7V@30A

SC1405B

www.semtech.com

Related parts for SC1405BTS.TR

SC1405BTS.TR Summary of contents

Page 1

POWER MANAGEMENT Description The SC1405B is a Dual-MOSFET Driver with an internal Overlap Protection Circuit to prevent shoot-through. Each driver is capable of driving a 3000pF load in 15ns rise/ fall time and has ULTRA-LOW propagation delay from in- put ...

Page 2

POWER MANAGEMENT Absolute Maximum Ratings ...

Page 3

POWER MANAGEMENT Electrical Characteristics - DC Operating Specifications ...

Page 4

POWER MANAGEMENT Electrical Characteristics - AC Operating Specifications ...

Page 5

POWER MANAGEMENT Timing Diagrams 2004 Semtech Corp. 5 SC1405B www.semtech.com ...

Page 6

POWER MANAGEMENT Pin Configuration Top View (14-Pin TSSOP) Pin Descriptions ...

Page 7

POWER MANAGEMENT Block Diagram Applications Information SC1405B SC1405B SC1405B is the higher speed version of the SC1405. SC1405B SC1405B It is designed to drive Low Rds_On power MOSFET’s with ultra-low rise/fall times and propagation delays. As the switching frequency of ...

Page 8

POWER MANAGEMENT Applications Information While components connecting to C-Delay, OVP_S, EN,S- MOD, DSPS_DR and PRDY are relatively non-critical, tight placement and short,wide traces must be used in layout of The Drives, DRN, and especially PGND pin. The top gate driver ...

Page 9

POWER MANAGEMENT Applications Information (Cont.) To eliminate the effect of the ringing on the boost ca- pacitor voltage, place a 4 Ohm resistor between boost Schottky diode and Vcc to filter the negative spikes on DRN Pin. Alternately, ...

Page 10

POWER MANAGEMENT Typical Characteristics Performance diagrams, Application Evaluation Board. PIN Descriptions 2004 Semtech Corp. Figure 1: PWM input and Gate drive switching waveforms. The MOSFETs driven are shown on Figure 4 (Evaluation Board Schematic) Ch1: PWM input signal Ch2: Top ...

Page 11

POWER MANAGEMENT Evaluation Board Schematic Figure 4 - APPLICA Figure 4 - APPLICA Figure 4 - APPLICATION EV Figure 4 - APPLICA Figure 4 - APPLICA TION EV TION EV TION EV TION EVAL AL AL ALU ...

Page 12

POWER MANAGEMENT Evaluation Board Bill of Materials ...

Page 13

... POWER MANAGEMENT Outline Drawing -TSSOP-14 Land Pattern - TSSOP-14 Contact Information Phone: (805)498-2111 FAX (805)498-3804 2004 Semtech Corp. Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 13 SC1405B www.semtech.com ...

Page 14

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