Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - battery management Charge management Li-Ion SOIC 8 N Surface-mount

AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and

ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

General Description

The MAX1811 is a single-cell lithium-ion (Li+) battery

charger that can be powered directly from a USB port*

or from an external supply up to 6.5V. It has a 0.5%

overall battery regulation voltage accuracy to allow

maximum utilization of the battery capacity.

The charger uses an internal FET to deliver up to

500mA charging current to the battery. The device can

be configured for either a 4.1V or 4.2V battery, using

the SELV input. The SELI input sets the charge current

to either 100mA or 500mA. An open-drain output (CHG)

indicates charge status.

The MAX1811 has preconditioning that soft-starts a

near-dead battery cell before charging. Other safety

features include continuous monitoring of voltage and

current and initial checking for fault conditions before

charging.

The MAX1811 is available in a small 1.4W thermally

enhanced 8-pin SO package.

________________________Applications

PDAs and Palmtops

Digital Still Cameras

MP3 Players

Cell Phones

Two-Way Pagers

Hand-Held Computers

Features

♦ Charges Single-Cell Li+ Batteries Directly from

USB Port

♦ 0.5% Overall Charging Accuracy

♦ Minimal External Components

♦ Input Diode Not Required

♦ Automatic IC Thermal Regulation

♦ Preconditions Near-Depleted Cells

♦ Convenient Power SO-8 Package (1.4W)

♦ P2

USB-Powered Li+ Charger

GND

BATTIN

CHG

ENSELI

GND

SELV

TOP VIEW

MAX1811

Pin Configuration

MAX1811

SELI

SELV

4.35V TO 6.5V

4.2V

4.1V

OFF

100mA

500mA

BATT

GND

CHG

TO IN

TO LOAD

SINGLE

Li+

CELL

CHG

LOGIC OUT

LED

Typical Operating Circuit

19-2024; Rev 2; 6/03

Ordering Information

8 SO

PIN-PACKAGETEMP RANGE

-40°C to +85°CMAX1811ESA

PART

* P2

MAX1811

Summary of content (8 pages)

PAGE 1
MAX1811 USB-Powered Li+ Charger LE AVAILAB General Description Features The MAX1811 is a single-cell lithium-ion (Li+) battery charger that can be powered directly from a USB port* or from an external supply up to 6.5V. It has a 0.5% overall battery regulation voltage accuracy to allow maximum utilization of the battery capacity. The charger uses an internal FET to deliver up to 500mA charging current to the battery. The device can be configured for either a 4.1V or 4.2V battery, using the SELV input.
PAGE 2
MAX1811 USB-Powered Li+ Charger ABSOLUTE MAXIMUM RATINGS IN, BATT, SELI, CHG, EN to GND ..............................-0.3V to 7V SELV to GND ...............................................-0.3V to (VIN + 0.3V) Continuous Power Dissipation (TA = +70°C) 8-Pin SO (derate 17.5mW/°C above +70°C)....................1.4W Short-Circuit Duration.................................................Continuous Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range ................
PAGE 3
MAX1811 USB-Powered Li+ Charger ELECTRICAL CHARACTERISTICS (VIN = 4.5V, TA = -40°C to +85°C, unless otherwise noted.) (Note1) PARAMETER CONDITIONS MIN Input Supply Voltage Input Undervoltage Lockout Precondition Threshold BATT Regulation Voltage MAX UNITS 6.50 V 3.75 4.05 V Operating, EN = IN, no load 3 mA Shutdown, EN = GND 6 µA V IIN rising Input Supply Current TYP 4.35 BATT rising, transition from precondition to charge mode 2.3 2.7 SELV = GND, IBATT = 0 4.06 4.
PAGE 4
MAX1811 USB-Powered Li+ Charger Typical Operating Characteristics (continued) (CHG unconnected, CBATT = 2.2µF, TA = +25°C, unless otherwise noted.) CHARGE CURENT vs. INPUT VOLTAGE VSELI = VIN 200 VSELI = 0 300 VSELI = VIN 250 VSELI = 0 200 150 100 50 100 0 50 -50 0 0 1 2 3 4 5 6 -15 10 35 60 85 TEMPERATURE (°C) MAX1811 toc07 600 VIN = VSELV = VEN = 6.5V, VBATT = 2.7V 500 VSELI = VIN VSELI = VIN 400 IBATT (mA) IBATT (mA) -40 CHARGE CURRENT vs.
PAGE 5
MAX1811 USB-Powered Li+ Charger Pin Description PIN NAME DESCRIPTION 1 SELV Battery Regulation Voltage-Select Input. A low (< 0.8V) selects a 4.1V battery regulation set point. A high (> 2.0V) selects a 4.2V battery regulation set point. 2 SELI Battery Regulation Current-Select Input. A low (< 0.8V) selects a 100mA maximum battery regulation current. A high (> 2.0V) selects a 500mA maximum battery regulation current.
PAGE 6
MAX1811 USB-Powered Li+ Charger Detailed Description Charger-Control Circuitry The voltage/current regulator consists of a voltage control loop, a current control loop, and a thermal control loop (Figure 1). Use the SELV input to set the battery regulation voltage to a 4.1V or 4.2V single Li+ cell. The current and thermal loops are internally compensated and require no external compensation. The outputs from all loops drive an internal linear regulator.
PAGE 7
MAX1811 USB-Powered Li+ Charger Charging from AC Adapters The MAX1811 also operates from sources other than USB ports. The full charging input voltage range is 4.35V to 6.5V. When charging in the 500mA mode with an AC adapter, rely on the thermal loop to limit the power dissipation by limiting the charge current at higher input voltages if limited PC board area is available to dissipate heat.
PAGE 8
MAX1811 USB-Powered Li+ Charger Package Information DIM A A1 B C e E H L N H E INCHES MILLIMETERS MAX MIN 0.069 0.053 0.010 0.004 0.019 0.014 0.010 0.007 0.050 BSC 0.157 0.150 0.228 0.244 0.050 0.016 MAX MIN 1.75 1.35 0.10 0.25 0.35 0.49 0.19 0.25 1.27 BSC 3.80 4.00 5.80 6.20 0.40 SOICN .EPS (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 1.