MAX1811 Maxim Integrated Products, MAX1811 Datasheet

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MAX1811

Manufacturer Part Number
MAX1811
Description
Manufacturer
Maxim Integrated Products
Datasheet

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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.
19-2024; Rev 2; 6/03
* Protected by U.S. Patent # 6,507,172
________________________Applications
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
100mA
4.35V TO 6.5V
4.1V
OFF
PDAs and Palmtops
Digital Still Cameras
MP3 Players
Cell Phones
Two-Way Pagers
Hand-Held Computers
500mA
4.2V
ON
SELI
SELV
EN
Typical Operating Circuit
IN
________________________________________________________________ Maxim Integrated Products
MAX1811
General Description
BATT
GND
CHG
LED
CHG
LOGIC OUT
TO LOAD
SINGLE
Li+
CELL
TO IN
USB-Powered Li+ Charger
o Charges Single-Cell Li+ Batteries Directly from
o 0.5% Overall Charging Accuracy
o Minimal External Components
o Input Diode Not Required
o Automatic IC Thermal Regulation
o Preconditions Near-Depleted Cells
o Convenient Power SO-8 Package (1.4W)
o Protected by U.S. Patent # 6,507,172
MAX1811ESA
USB Port
TOP VIEW
PART
SELV
GND
SELI
IN
1
2
4
3
-40°C to +85°C
TEMP RANGE
Ordering Information
MAX1811
SO
Pin Configuration
6
8
7
5
PIN-PACKAGE
8 SO
CHG
EN
GND
BATT
Features
1

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MAX1811 Summary of contents

Page 1

... 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 ...

Page 2

USB-Powered Li+ Charger ABSOLUTE MAXIMUM RATINGS IN, BATT, SELI, CHG GND ..............................-0. SELV to GND ...............................................-0. Continuous Power Dissipation (T = +70°C) A 8-Pin SO (derate 17.5mW/°C above +70°C)....................1.4W Short-Circuit Duration.................................................Continuous Stresses beyond those ...

Page 3

ELECTRICAL CHARACTERISTICS (V = 4.5V -40°C to +85°C, unless otherwise noted.) (Note1 PARAMETER Input Supply Voltage Input Undervoltage Lockout Input Supply Current Precondition Threshold BATT Regulation Voltage BATT Leakage Current (Input Power Removed) BATT Shutdown Current ...

Page 4

USB-Powered Li+ Charger (CHG unconnected 2.2µ +25°C, unless otherwise noted.) BATT A CHARGE CURRENT vs. BATTERY CURRENT 500 450 5. SELV 400 350 SELI IN ...

Page 5

... Charging Indicator Open-Drain Output. CHG pulls low while the device is in charge mode (2.5V 8 CHG < V < BATT Regulation Voltage). BATT THERMAL LOOP 3V BIAS EN OVERCURRENT DETECTOR 2V MAX1811 Figure 1. Functional Diagram _______________________________________________________________________________________ USB-Powered Li+ Charger DESCRIPTION can exceed the voltage at V SELI IN SELI VOLTAGE CURRENT LOOP SELECTOR VOLTAGE ...

Page 6

... USB connects to the MAX1811 input, and the MAX1811 drives the load and charges the battery when enabled. Charge-Current Selection The MAX1811 charges a single cell Li+ battery in either 100mA or 500mA modes. The MAX1811 expects the system to poll the USB host to determine if the USB is capable of providing 100mA or 500mA and regulates the charging current accordingly (Figure 2) ...

Page 7

... 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 avail- able to dissipate heat ...

Page 8

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2003 Maxim Integrated Products ...

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