MAX8606 데이터 시트보기 (PDF) - Maxim Integrated

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MAX8606

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

Maxim Integrated 

USB/AC Adapter, Li+ Linear Battery Charger

with Integrated 50mΩ Battery Switch in TDFN

Connect a 4.7µF ceramic capacitor from IN to GND as

close to the IC as possible. Use a larger input bypass

capacitor to reduce supply noise.

Thermal Considerations

The MAX8606 is available in a thermally enhanced

TDFN package with exposed paddle. Connect the

exposed paddle to a large copper ground plane to pro-

vide a good thermal contact between the device and

the circuit board. The exposed paddle transfers heat

away from the device, allowing the MAX8606 to charge

the battery with maximum current while minimizing the

increase in die temperature.

DC Input Sources

The MAX8606 operates from well-regulated DC

sources. The full-charging input voltage range is 4.25V

to 5.8V. The device survives input voltages up to 14V

without damage to the IC. If VIN is greater than 5.8V

(typ), the IC stops charging. An appropriate power sup-

ply must provide at least 4.25V when sourcing the

desired peak charging current. It also must stay below

5.8V when unloaded.

Application Circuits

Stand-Alone Li+ Charger

The MAX8606 provides a complete Li+ charging solu-

tion. Figure 3 shows the MAX8606 as a stand-alone Li+

battery charger. The 23.58kΩ resistor connected to

SETI sets a charging current of 712mA (typ). The LED

indicates when either prequal or fast-charging has

begun. When the battery is charged the LED turns off.

USB Application with AC Adapter

The MAX8606 can be configured for USB applications

with an optional AC-adapter input (Figure 4). The p-

channel MOSFET disconnects the USB port when the

AC adapter is installed. Alternately, the USB port and

AC adapter may be excluded from each other by

mechanical means, such as using a single connector.

USB-Powered Li+ Charger

The universal serial bus (USB) provides a high-speed

serial communication port, as well as power for the

remote device. The MAX8606 can be configured to

charge a battery at the highest current possible from

the host port. Figure 5 shows the MAX8606 as a USB

battery charger. To make the circuit compatible with

either 100mA or 500mA USB ports, the system software

begins at 100mA charging current. The microprocessor

then enumerates with the host to determine its current

capability. If the host port is capable, the charging cur-

rent is increased to 475mA to avoid exceeding the

500mA USB specification.

USB/AC-ADAPTER

OVP UP TO 14V

C1

4.7μF

C3

0.1μF

R1

23.58kΩ

VI/O

D1

STATUS

INDICATORS

R2

R3

1kΩ 100kΩ

IN

CHG

POK

GND

C4

0.1μF

VL MAX8606

SYS

EN1

EN2

BAT

THM

+3.5V TO +4.2V

C2

4.7μF

TMR

T1

10kΩ

4.2V Li+

SETI

NTC

Figure 3. Stand-Alone Application

Layout and Bypassing

Place the input capacitor as close to the device as pos-

sible. Provide a large copper ground plane to allow the

exposed paddle to sink heat away from the device.

Connect the battery to BAT as close to the device as

possible to provide accurate battery voltage sensing.

Make all high-current traces short and wide to minimize

voltage drops. A sample layout is available in the

MAX8606 evaluation kit to help speed designs.

Chip Information

PROCESS: BiCMOS

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