Rainbow Electronics MAX1508 - Manual

General Description
The MAX1508 is an intelligent, stand-alone constant-cur-
rent, constant-voltage (CCCV), thermally regulated linear
charger for a single-cell lithium-ion (Li+) battery. The
MAX1508 integrates the current-sense circuit, MOS pass
element, and thermal-regulation circuitry, and also elimi-
nates the reverse-blocking Schottky diode, to create the
simplest and smallest charging solution for hand-held
equipment.
The MAX1508 functions as a stand-alone charger to
control the charging sequence from the prequalification
state through fast-charge, top-off charge, and full-
charge indication.
Proprietary thermal-regulation circuitry limits the die
temperature to +100°C when fast charging or while
exposed to high ambient temperatures, allowing maxi-
mum charging current without damaging the IC.
The MAX1508 achieves high flexibility by providing an
adjustable fast-charge current by an external resistor.
Other features include the charging status (CHG) of the
battery, an active-low control input (EN), and an active-
low-input power-source detection output (ACOK).
The MAX1508 accepts a +4.25V to +13V supply, but dis-
ables charging when the input voltage exceeds +7V to
protect against unqualified or faulty AC adapters. The
MAX1508 operates over the extended temperature
range (-40°C to +85°C) and is available in a compact
8-pin thermally enhanced 3mm x 3mm thin DFN pack-
age with 0.8mm height.
Applications
Cellular and Cordless Phones
PDAs
Digital Cameras and MP3 Players
USB Appliances
Charging Cradles and Docks
Bluetooth™ Equipment
Features
♦ Stand-Alone Linear 1-Cell Li+ Battery Charger
♦ No External FET, Reverse-Blocking Diode, or
Current-Sense Resistor Required
♦ Programmable Fast-Charge Current (0.8A max)
♦ Proprietary Die-Temperature Regulation Control
(+100°C)
♦ +4.25V to +13V Input Voltage Range with Input
Overvoltage Protection (OVP) Above +7V
♦ Charge-Current Monitor for Fuel Gauging
♦ Low Dropout Voltage—130mV at 0.425A
♦ Input Power-Source Detection Output (ACOK) and
Charge-Enable Input (EN)
♦ Soft-Start Limits Inrush Current
♦ Charge Status Output (CHG) for LED or
Microprocessor Interface
♦ Small 3mm x 3mm 8-Pin Thin DFN Package,
0.8mm High
MAX1508
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and
ACOK
in 3mm x 3mm TDFN
________________________________________________________________ Maxim Integrated Products 1
ACOK EN
ISET
1 2
CHG BATT
IN
GND
VL
3mm x 3mm THIN DFN
TOP VIEW
3 4
MAX1508
8 7 6 5
Pin Configuration
Ordering Information
MAX1508
1 µF
INPUT
4.25V TO 13V
2.80k Ω
IN
EN
VL
CHG
1 µF
Li+
4.2V
BATT
ISET
GND
0.47 µF
OFF
ON
ACOK
PART TEMP RANGE PIN-PACKAGE
TOP
MARK
MAX1508ETA -40 °C to +85°C 8 Thin DFN-EP* AHF
Typical Operating Circuit
19-2890; Rev 0; 6/03
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.
EVALUATION KIT
AVAILABLE
Bluetooth is a trademark of Ericsson.
*EP = Exposed paddle.