19-0994; Rev 0; 10/07
28V Linear Li+ Battery Charger with
Smart Autoboot Assistant
The MAX8814 intelligent, stand-alone constant-current,
constant-voltage (CCCV), thermally regulated linear
charger is designed for charging a single-cell lithium-
ion (Li+) battery. The MAX8814 integrates the current-
sense circuit, MOSFET pass element, thermal-
regulation circuitry, and eliminates the reverse-blocking
Schottky diode to create the simplest and smallest
charging solution for handheld equipment.
The IC controls the charging sequence from the pre-
qualification state through constant-current fast-charge
and the final constant voltage charge. Proprietary ther-
mal-regulation circuitry limits the die temperature dur-
ing fast-charging or when the IC is exposed to high
ambient temperatures, allowing maximum charging
current without damaging the IC.
The MAX8814 achieves high flexibility by providing an
adjustable fast-charge current through an external
resistor. Other features include an active-low control
input (EN) and an active-low input power-source detec-
tion output (POK). The IC also features a booting assis-
tant circuit that distinguishes input sources and battery
connection and provides an output signal (ABO) for
The MAX8814 accepts an input supply range from
4.25V to 28V, but disables charging if the input voltage
exceeds +7V to protect against unqualified or faulty AC
adapters. The IC operates over the extended tempera-
ture range (-40°C to +85°C) and is available in a com-
pact 8-pin thermally enhanced TDFN 2mm x 2mm
package (0.8mm max height).
Cellular and Cordless Phones
Smartphones and PDAs
Digital Still Cameras
Charging Cradles and Docks
o CCCV, Thermally Regulated Linear 1-Cell Li+
o No External MOSFET, Reverse Blocking Diode, or
o Programmable Fast-Charge Current (1ARMS max)
o Proprietary Die Temperature Regulation Control
o 4.25V to 28V Input Voltage Range with Input OVP
o Charge-Current Monitor for Fuel Gauging (ISET)
o Low Dropout Voltage (300mV at 500mA)
o Input Power-Source Detection Output (POK),
Charge-Enable Input (EN)
o Soft-Start Limits Inrush Current
o Output for Autobooting (ABO)
o Tiny 2mm x 2mm, 8-Pin TDFN Package, 0.8mm
2mm x 2mm
+Denotes a lead-free and RoHS-compliant package.
Typical Operating Circuit
4.25V TO 28V
Bluetooth is a registered trademark of Bluetooth SIG.
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.