SC2442H Semtech Corporation, SC2442H Datasheet

SC2442H

Manufacturer Part Number

SC2442H

Description

High Performance Wide Input Range Dual Synchronous Buck Controller

Manufacturer

Semtech Corporation

Datasheet

1.SC2442H.pdf (10 pages)

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Bonase Electronics (HK) Co., Limited

Part Number:

SC2442HITSTRT

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MAXM

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SC2442 and SC2442H are high performance dual buck

converter controllers that can be configured for a variety

of synchronous buck applications where efficiency is most

important. Both converters are synchronized to prevent

beat frequencies. The dual buck converters are also

operated out of phase reducing input ripple, allowing for

fewer input capacitors.

High frequency operation up to 1.1 MHz reduces the size

of output inductors and capacitors. The controller has

separate power pins for both VCC and GND to improve

noise immunity. The VCC supplies can be regulated to 7V

using an external PNP transistor. Other features include:

bootstrapping for high side drive supplies, asynchronous

mode start up, power up sequencing to prevent latch-

ups, individual soft start for each convertor, bootstrapped

drivers for high side N-channel MOSFETs, input side

current sensing, dual mode current limit with hiccup,

enable and external frequency synchronization.

The SC2442 operates over the range of 4.75V to 30V

and SC2442H operates over the range of 4.75V to 36V.

Revision: June, 2007

POWER MANAGEMENT

Description

Typical Application Circuit

R12

RTN

VIN+

RTN

ENA

R10

SS1

SS2

OSC

MAX 30V/36V (H)

R11

AVCC

PVCC

R17

FB1

C10

VI N

BD I

AVC C

P VC C

S S 1

S S 2

ROS C

FB1

E A1

FB2

E A2

S YN C /E N

C12

G D 1H

G D 2H

P G ND

AG ND

G D 1L

G D 2L

BS T 1

BS T 2

P H 1

P H 2

OC 1

OC 2

OC1

OC2

R18

C11

High Performance Wide Input Range

C13

Dual Synchronous Buck Controller

EA2

Features

Applications

FB2

PH1

BST1

PH2

BST2

Dual output controller

Asynchronous start up mode

Power up sequencing to prevent latch-ups

Out of phase operation for low input ripple

Over current protection

Output down to 0.75V

Wide input range, 4.75 to 30V for SC2442 and

Vcc regulator with external PNP transistor

Programmable clock frequency up to 1.1MHz

Two synchronous bucks for high efficiency at high

current

–40 to +125 Deg C operating temperature

Small package TSSOP-24

Fully WEEE and RoHS Compliant

Point of load converter applications

DSL applications with multiple output voltages

Power management for mixed signal applications

Cable modems and set top boxes.

4.75 to 36V for SC2442H

C15

C16

RTN

www.DataSheet4U.com

VOUT2

RTN

R13

R15

SC2442/H

VOUT1

www.semtech.com

RTN

R14

R16

Related parts for SC2442H

SC2442H Summary of contents

Page 1

... N-channel MOSFETs, input side current sensing, dual mode current limit with hiccup, enable and external frequency synchronization. The SC2442 operates over the range of 4.75V to 30V and SC2442H operates over the range of 4.75V to 36V. Typical Application Circuit MAX 30V/36V (H) VIN+ ...

Page 2

POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied ...

Page 3

POWER MANAGEMENT Electrical Characteristics (Cont.) - Unless specified 125°C, VIN = 24V ...

Page 4

POWER MANAGEMENT Electrical Characteristics (Cont.) - Unless specified 125°C, VIN = 24V ...

Page 5

POWER MANAGEMENT Pin Descriptions ...

Page 6

Page 7

POWER MANAGEMENT Application Information Undervoltage Lockout The undervoltage lockout circuitry monitors the AVCC pin. During undervoltage lockout all output drives are turned off and both SS pins are discharged to ground. Typically, for AVCC increasing, normal operation will not occur ...

Page 8

POWER MANAGEMENT Application Information (Contd) 4.75-6V R1 VIN J1 J1-2 C8 C22 J1-3 C23 TP1 10 nF PVCC RTN 3 2 C10 R10 13 7 C11 SS1 6 C16 ...

Page 9

POWER MANAGEMENT Application Information (Contd) Fig 3) Switching waveforms at Phase Node with full load. Top trace: 1.8V/1A Bottom trace: 3.3V/0.6A Fig 5) 1.8V Transient response for 10% to 100% step load © 2007 Semtech Corp. Fig 4) Output ripple ...

Page 10

... POWER MANAGEMENT Outline Drawing - TSSOP-24 Land Pattern - TSSOP-24 Contact Information Phone: (805)498-2111 FAX (805)498-3804 © 2007 Semtech Corp. Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 10 SC2442/H www.DataSheet4U.com www.semtech.com ...

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