KIT
ATION
EVALU
ILABLE
AVA
19-3795; Rev 1; 12/08
USB/AC Adapter, Li+ Linear Battery Charger
with Integrated 50mΩ Battery Switch in TDFN
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 thermalregulation 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 (CCCVCTJ) regulation for safe operation in handhelds.
Two logic inputs (EN1 and 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-R 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 (CHG),
and an input-supply detection flag (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.
Applications
Features
♦ Small 3mm x 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
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
TOP
MARK
MAX8606ETD+
-40°C to +85°C
14 TDFN 3mm x
3mm (T1433-1)
AAF
+Denotes lead-free/RoHS-compliant package.
Cellular Phones, Smartphones, PDAs
Typical Operating Circuit
Digital Cameras, MP3 Players
USB Appliances, Charging Cradles and Docks
STATUS
INDICATORS
CHG
POK
SYS 3.5V TO 4.2V
IN
TMR
14 13 12 11 10
USB/AC-ADAPTER
OVP UP TO 14V
EN2
EN1
GND
SETI
SYS
TOP VIEW
SYS
Pin Configuration
GND
9
8
VL
0.1μF
CONTROL
INPUT
CURRENT
SELECTION
MAX8606
EN1
EN2
IN
5
6
7
TMR
SETI
Li+
POK
BAT
4
CHG
3
THM
2
VL
1
BAT
+
μP
STAND-ALONE
BAT
THM
MAX8606
TDFN
________________________________________________________________ Maxim Integrated Products
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.
1
MAX8606
General Description
