19-3670; Rev 0; 4/05
1A Linear Li+ Battery Chargers with Integrated Pass
FET and Thermal Regulation in 2mm x 2mm TDFN
The MAX8808X/MAX8808Y/MAX8808Z intelligent,
stand-alone constant-current/constant-voltage (CCCV),
thermally regulated linear chargers are designed for
charging a single-cell lithium-ion (Li+) battery. The
MAX8808X/MAX8808Y/MAX8808Z integrate the cur-
rent-sense circuit, MOS pass element, and thermal-reg-
ulation circuitry, and eliminate the reverse-blocking
Schottky diode to create the simplest and smallest
charging solution for handheld equipment.
The MAX8808X 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. The MAX8808Y and MAX8808Z elimi-
nate the prequalification state to allow startup into a load
without a battery. Proprietary thermal-regulation circuitry
limits the die temperature when fast-charging or while
exposed to high ambient temperatures, allowing maxi-
mum charging current without damaging the IC.
The MAX8808X/MAX8808Y/MAX8808Z achieve high
flexibility by providing an adjustable fast-charge current
with an external resistor. Other features include a bat-
tery charging-status indicator (CHG), an active-low con-
trolwww.DataSheet4U.com input (EN) for the MAX8808X and MAX8808Z
(active-high control input for the MAX8808Y), and an
active-low input power-source detection output (ACOK).
The MAX8808X/MAX8808Y/MAX8808Z accept a
+4.25V to +15V supply, but disable charging when the
input voltage exceeds +7V to protect against unquali-
fied or faulty AC adapters. The MAX8808X/MAX8808Y/
MAX8808Z operate over the extended temperature
range (-40°C to +85°C) and are available in a compact
8-pin thermally enhanced 2mm x 2mm TDFN package
with 0.8mm (max) height.
Cellular and Cordless Phones
Smartphones and PDAs
Digital Still Cameras and MP3 Players
Charging Cradles and Docks
Pin Configuration appears at end of data sheet.
♦ Stand-Alone Linear 1-Cell Li+ Battery Charger
♦ No External FET, Reverse Blocking Diode, or
Current-Sense Resistor Required
♦ Programmable Fast-Charge Current (1A max)
♦ Proprietary Die Temperature Regulation Control
♦ +4.25V to +15V Input Voltage Range with Input
OVP Above +7V
♦ Charge-Current Monitor for Fuel Gauging
♦ Low Dropout Voltage—300mV at 500mA
♦ Input Power-Source Detection Output (ACOK) and
Charge-Enable Input (EN or EN)
♦ Soft-Start Limits Inrush Current
♦ Charge-Status Output (CHG) for LED or
Microprocessor (µP) Interface
♦ Tiny 2mm x 2mm 8-Pin TDFN Package, 0.8mm
MAX8808XETA+ 8 TDFN-EP* 2mm x 2mm (T822-1)
MAX8808YETA+ 8 TDFN-EP* 2mm x 2mm (T822-1)
MAX8808ZETA+ 8 TDFN-EP* 2mm x 2mm (T822-1)
All devices specified over the -40°C to +85°C operating range.
+Denotes lead-free package.
*EP = Exposed paddle.
Typical Operating Circuit
4.25V TO 15V
Bluetooth is a registered trademark of Bluetooth SIG.
*MAX8808Y USES ACTIVE-HIGH LOGIC FOR EN.
________________________________________________________________ Maxim Integrated Products 1
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.