MAX8606 USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50m Ohm Battery Switch in TDFN

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The MAX8606 complete 1-cell Li+ battery charge-management IC operates from either a USB port or AC adapter. It integrates a battery disconnect switch, current- sense circuit, PMOS pass element, and thermal-regulation circuitry, while eliminating the external reverse-blocking Schottky diode, to create a simple and small charging solution. The charging sequence initiates from power-OK indication, through prequalification, fast-charge, top-off charge, and finally charging- complete indication for single-cell Li+ batteries. Charging is controlled using constant current, constant voltage, or constant die-temperature (CCCVCT_J) regulation for safe operation in handhelds.

Two logic inputs (active-low EN1 and active-low EN2) select suspend mode, 100mA, 500mA, or ≤ 1A input current limits to suit USB requirements. Proprietary thermal-regulation circuitry limits the die temperature to +100°C to prevent excessive heat on the system PC board. Additional safety features include an NTC thermistor input (THM) and internal timers to protect the battery. A 3.5V to 4.2V SYS output, in conjunction with the low-RM_DSON battery switch, powers the system even when the battery is deeply discharged or not installed. The IC also offers a +3.3V/500µA output (VL), a charging status flag (active-low CHG), and an input-supply detection flag (active-low POK). The MAX8606 operates from a +4.25V to +5.5V supply and includes undervoltage lockout below +3.4V and overvoltage protection up to +14V.

Key Features

Applications/Uses

Small 3mm × 3mm Thermally Enhanced TDFN Package (0.8mm max height)
USB-Compliant Suspend Mode (20µA)
Selectable 100mA, 500mA, and Up to 1A Input Current Limits
USB or AC Adapter Input
+6V to +14V Input Overvoltage Protection
Input UVLO Below +4V Rising (3.5V Falling)
Automatic Current Sharing Between Battery Charging and System
Die Temperature Regulation (+100°C)
Prequal, Fast-Charge, and Top-Off Timers
Low Dropout Voltage, 250mV at 0.5A
NTC Thermistor Input
Charge Status and Input-Supply Detection Flags

	Cellular Phones, Smartphones, PDAs
	Digital Cameras, MP3 Players
	USB Appliances, Charging Cradles, and Docks

Key Specifications: Battery Chargers

Part Number

Cell Chemistry

Number of Lithium-Ion cells

Protected V_IN (max) (V)

Charging V_IN (max) (V)

Internal FET/Transistor

Charger (V)

Charge Rate Set by

Max. Charge Current (A)

Charge Termination

Secondary Charge Termination

Charge Regulation

Features

EV-Kit

Package

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX8606

Li-Ion
Li-Polymer

5.5

Yes

4.2

Logic Input
Resistor

Min. Charge Current

Timer

Linear

•	Dual USB/Adapter Input

•	Smart Power Selector

•	Stand Alone

•	Thermal Die Regulation

•	Thermistor Input

•

Timer

•

USB Input

Yes

THIN QFN (Dual)/14

Yes

-40 to +85

$1.90 @ 1k

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Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.