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SC4509SKTRT, SC450ITS, SC451

Table of contents:
Info of SC4509SKTRT
Info of SC450ITS
Info of SC451

SC4509SKTRT, SC450ITS, SC451 Selling Leads, Datasheet

MFG:Semtech (VA) Category:Integrated Circuits (ICs) Package Cooled:0 D/C:712

SC4509SKTRT, SC450ITS, SC451 Datasheet download

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Part Number: SC4509SKTRT

Category: Integrated Circuits (ICs)

MFG: Semtech (VA)

Package Cooled: 0

D/C: 712

Description: IC LED DRVR WT/OLED BCKLT SOT236

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SC4509SKTRT Parameters

Technical/Catalog Information	SC4509SKTRT
Vendor	Semtech (VA)
Category	Integrated Circuits (ICs)
Package / Case	SOT-23-6
Packaging	Digi-Reel?
Current - Output / Channel	30mA
Number of Outputs	1
Type	Backlight, OLED, White LED
Voltage - Supply	2.7 V ~ 10 V
Voltage - Output	20V
Topology	Switched Inductor, Step-Up (Boost)
Frequency	1.2MHz
Operating Temperature	-40°C ~ 85°C
Efficiency	81%
Drawing Number	*
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	SC4509SKTRT SC4509SKTRT SC4509SKDKR ND SC4509SKDKRND SC4509SKDKR

SC451 General Description

The SC451 PowerStep IV™ IC is a single chip high-performance Hysteretic PWM controller. With its integrated SmartDriver™, it powers advanced IMVP-IV™ and IMVP4+™ processors. The SC451 features extended Intel Mobile Voltage Positioning (IMVP™) to increase battery life by reducing the voltage at the processor when it is heavily loaded. It directly supports Intel's SpeedStep® processors for even longer battery life. The SC451 fully supports the Intel® Geyserville-III core voltage specification. It provides direct "deeper sleep" mode and boot voltage support. Automatic "power-save" is present to prevent negative current flow in the low-side FET during light loading conditions, saving even more power. The high side driver initially turns on with a weak drive to reduce ringing, EMI, and capacitive turn-on of the low side.

A 6-bit DAC, accurate to 0.85%, sets the output voltage reference, and implements the 0.700V to 1.708V range required by the processor. The hysteretic converter uses a comparator without an error amplifier, and therefore provides the fastest possible transient response, while avoiding the stability issues inherent to classical PWM controllers. T he DAC is externally slew rate limited to minimize transient currents and audible noise.

The SC451 operates from 5Vdc and also features soft-start, an open-drain PWRGD signal with power-good blanking, and an enable input. Programmable current limiting shuts down the SC451 after 32 current limit pulses. In addition, it comes in a space-saving MLP 6X6-28 and TSSOP-28 package. TSSOP-38 package is also available which provides a pin to pin upgrade to a dual phase solution using Semtech's dual phase controller SC450.

SC451 Features

·IMVP-IV™ and IMVP-IV+™ compliant single chip solution
·On chip CLK_ENABLE# and IMVP4_PWRGD outputs
·Backward compatible with SC1479
·High speed hysteretic controller
·Single phase operation
·Selectable analog or VID controlled DeeperSleep setting
·6 bit VID programmable output
·Integrated drivers with soft high side turn-on
·Programmable softstart
·Programmable boot voltage
·Programmable DeeperSleep voltage
·Under-voltage lock out on VccA
·Over-voltage protection on CORE
·Current limit protection on CORE
·Thermal protection
·Powergood flag with blanking during VID or DeeperSleep mode changes
·Automatic powersave at light load
·TSSOP-28, TSSOP-38 and MLP 6X6-28 package options

SC451 Typical Application

·Low power Notebook and Laptop computers
·Embedded Applications

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