SC2542EVB SEMTECH [Semtech Corporation], SC2542EVB Datasheet

SC2542EVB

Manufacturer Part Number

SC2542EVB

Description

High Performance Wide Input Range Dual Synchronous Buck Controller

Manufacturer

SEMTECH [Semtech Corporation]

Datasheet

1.SC2542EVB.pdf (27 pages)

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SC2542 is a high performance dual PWM controller. It is

designed to convert a widely ranged battery rail down to

two independent output rails. The PWM operation of the

two channels are 180 degrees out of phase which can

greatly reduce the size and the cost of the input capaci-

tors. Synchronous buck PWM topology and voltage mode

control allow fast transient response and flexible com-

ponent selection for easy designs. A 5V standby regula-

tor is integrated. A 10V internal linear regulator provides

the bias for the controller, and this voltage is optimized

for gate drivers to deliver high efficiency.

The light load efficiency can be greatly improved by turn-

ing off the low side MOSFET upon reversal of inductor

current. There is no need for a current sensing resistor

because the MOSFET on resistance is used as the sens-

ing element. Under extreme light load conditions, the

device will operate in a pulse skip mode. The switching

frequency can be dropped significantly to a level pro-

grammed by external resistors. The battery energy is bet-

ter utilized with these efficiency enhancement schemes.

pendent start up and power good output. In shutdown

mode the controller only draws 100nA from the supply.

The controller also offers full protection features for the

conditions of under voltage, over voltage, and over cur-

rent. The switching frequency is adjustable from 100KHz

to 300KHz. TSSOP-28-EDP package is offered.

Revision: August 24, 2005

POWER MANAGEMENT

Description

Typical Application Circuit

The power sequencing is fully supported including inde-

VO1 (3.3V/10A)

FB1

STBY MODE

ENABLE

FB1

VIN+

VCC

VIN

VCC

STBY

FB1

ERROUT1

MINSET1

SS1

ILIM1

BST1

DRVH1

PHASE1

DRVL1

PGND

SC2542

High Performance Wide Input Range

TH-PAD

Dual Synchronous Buck Controller

ERROUT2

Features

Applications

MINSET2

PWRGD

PHASE2

DRVH2

5VSBY

DRVL2

AGND

ROSC

PVCC

ILIM2

BST2

FB2

SS2

Independent dual-switcher-outputs

Integrated 5V standby output with over 50mA

capability

Wide input voltage range: 6.5V ~ 28V

Adjustable output voltage down to 0.75V

Light load efficiency enhancement

Programmable skip mode operation

Flexible power sequencing with enable and power

good output

Synchronous buck topology with voltage mode

control

Out of phase operation to reduce cost of input

capacitor

10V internal regulator for gate driver to deliver high

efficiency

Programmable switching frequency:

100KHz ~ 300KHz

Full protection: UVLO, OVP, and programmable OCP

No need for current sense resistor

Low standby operating current (200

Low shut down current (100nA typical)

28 lead TSSOP package with exposed die pad

(EDP)

Fully WEEE package and RoHS Compliant

Notebook computer system power

Systems with 6.5V ~ 28V input

Network and telecom systems

Other portable devices

5VSBY

VCC

VO1

VIN+

PWGRD

FB2

VO2 (5V/10A)

FB2

µA typical)

www.semtech.com

SC2542

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