SC415 datasheet(1/30 Pages) SEMTECH

No de pièce	SC415

Description	Dual Synchronous Buck Controller

PDF	30 Pages

Scroll/Zoom	100%

Fabricant	SEMTECH [Semtech Corporation]

Site Internet	http://www.semtech.com

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POWER MANAGEMENT

Oct 08, 2007

1

SC415

Dual Synchronous Buck Controller

Features

VIN Range 3-25V

Outputs Adjustable from 0.75 to 5.25V,

or Preset Output Voltages:

VOUT1 = 1.8 or 1.5V

VOUT2 = 1.25 or 1.05V

Low Shutdown Power

Constant On-Time for Fast Dynamic Response

Adjustable Switching Frequency

Separated Frequencies for Minimal Switching

Interaction:

VOUT1 = up to 600kHz

VOUT2 = up to 720kHz

Power Save or Continuous Operation at Light Load

Adjustable Soft-start Rates for Each Output

Soft-Shutdown for Each Output

Over-Voltage and Under-Voltage Fault Protection

Cycle-by-Cycle Valley Current Limit

DC Current Sense Using Low-Side RDSON Sensing,

or RSENSE in Source of Low-Side MOSFET for Greater

Accuracy

Separate Power Good Outputs

Separate Enable/Power Save Inputs

3.1A Non-Overlapping Gate Drive

SmartDriveTM for High-Side MOSFET

MLP 4x4 24 Pin Package

Industrial Temperature Range

Applications

Notebook and Sub-Notebook Graphics

Voltage Controllers

Tablet PCs

Embedded Applications

•

Description

The SC415 is a versatile, constant on-time, pseudo fixed-

frequency, dual synchronous buck PWM controller

intended for notebook computers and other battery

operated portable devices. The SC415 contains all the

features needed to provide cost-effective control of two

independent switchmode power supplies.

The two DC outputs are adjustable from 0.75V to 5.25V.

Additional features for each output include cycle-by-

cycle current limit, voltage soft-start, under-voltage and

over-voltage protection, programmable over-current

protection, soft shutdown, selectable power save and

non-overlapping gate drive. The SC415 provides two

enable/power save inputs, two soft-start inputs, two

power good outputs and an on-time adjust input.

The constant on-time topology provides fast dynamic

response. The excellent transient response means that

SC415 based solutions require less output capacitance

than competing fixed-frequency converters. Switching

frequency is constant until a step in load or line voltage

occurs, at which time the pulse density and frequency

moves to counter the change in output voltage. After the

transient event, the controller frequency returns to steady

state operation. At light loads with power save enabled,

the SC415 reduces switching frequency for improved

efficiency.

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