SC824ULTRT Semtech, SC824ULTRT Datasheet

SC824ULTRT

Manufacturer Part Number

SC824ULTRT

Description

Single-cell Li-Ion Charger Tri-Mode With Timer And NTC

Manufacturer

Semtech

Datasheets

1.SC824ULTRT.pdf (27 pages)

2.SC824ULTRT.pdf (29 pages)

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POWER MANAGEMENT

Typical Application Circuit

December 9, 2008

Features

Applications

Single input 30V protected charger

Adapter, USB High, USB Low modes

Charging by current regulation, voltage regulation,

and thermal limiting

Programmable currents from 70mA to 1A

Fast-charge current regulation — 15% at 70mA,

9% at 700mA

Constant voltage — 4.2V, 1% regulation

Input voltage protection — 30V

Current-limited adapter support capability — reduces

power dissipation in charger IC

USB modes automatically reduce charge current if

needed to prevent USB Vbus overload

Instantaneous CC-to-CV transition for faster charging

Battery temperature NTC thermistor interface

Multi-stage charge timer for safety and alternative

termination

Three termination options — fl oat-charge, automat-

ic re-charge, or forced re-charge to keep the battery

topped-off after termination without fl oat-charging

Soft-start reduces adapter or USB load transients

High operating voltage range permits use of unregu-

lated adapters

Complies with CCSA YD/T 1591-2006

High-current USB Dedicated Charger compatible

Ultra-thin 2x2x0.6 (mm) MLPD package

WEEE and RoHS compliant

Mobile phones

Personal Media Players

Personal Navigation Devices

MODE SELECT

CPU GPIO

ADAPTER

2.2μF

1μF

VIN

VSYS

MODE

RTIME

GND

SC824

Description

The SC824 is a single input triple mode (adapter/USB High,

USB Low) linear single-cell Li-Ion battery charger in a 10

lead 2x2 (mm) MLPD ultra-thin package.

Charging begins automatically when an input source is

applied to the charging input. The input is designed to

survive sustained input voltage up to 30V to protect

against hot plug overshoot and faulty charging adapters.

Thermal limiting protects the SC824 from excessive power

dissipation.

The SC824 provides three modes of charging: adapter

mode, USB low power mode, and USB high power mode.

Adapter mode charges up to 1A with the charging adapter

operating either in voltage regulation or in current limit to

obtain the lowest possible power dissipation. A single

current programming pin is used to program precharge

current, termination current, and fast-charge current in

fi xed proportions. The USB modes provide low and high

power fast-charge currents. The two USB modes dynami-

cally limit the charging load if necessary to automatically

prevent overloading the USB Vbus supply.

The SC824 provides a battery NTC thermistor interface to

disable charging when the battery temperature exceeds

programmed thresholds. An optional programmable

multi-stage charge timer protects against a faulty battery,

or terminates charging on timeout if the system load is

too great to terminate charging on current. A 45 minute

top-off period following termination ensures a fully

charged battery. The monitor state restarts a charge cycle

if the battery discharges after the charger has turned off .

EN_NTC

IPRGM

STAT0

STAT1

BAT

Tri-Mode with Timer and NTC

NPU

IPRGM

Single-cell Li-Ion Charger

2.2μF

Battery

Thermistor

Pack

NTC

SC824

Device

Load

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