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MAX8845Y

28V Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output

Maxim Integrated 

28V Linear Li+ Battery Chargers with Battery

Detection and Overvoltage Protected Output

Pin Description

PIN

MAX8845Y/

MAX8845Z MAX8845X/

MAX8845W

1

1

NAME

FUNCTION

SETI

Charge-Current Program and Fast-Charge Current Monitor. Output current from SETI is

1016µA per ampere of battery charging current. Set the charging current by connecting

a resistor (RSETI in Figure 3) from SETI to GND. IFAST-CHARGE = 1400V/RSETI. To

configure the MAX8845Z/MAX8845Y/MAX8845X/MAX8845W as a USB charger, see

Figure 5.

Battery Pack ID Resistor Detection Input. If DETBAT is pulled low through a pulldown

2

2

DETBAT resistor less than 51kΩ the charger is enabled. If DETBAT is left unconnected, the

charger is disabled.

3

3

ABI

Autobooting External Input. See the Autobooting Assistant section and Table 1 for

autobooting conditions. ABI is pulled to GND through an internal 200kΩ resistor.

4

4

EN

Active-Low, Logic-Level Enable Input. Drive EN high to disable charger. Drive EN low or

leave unconnected for normal operation. EN has an internal 200kΩ pulldown resistor.

5

5

GND

Ground. Connect GND and the exposed pad to a large copper ground plane for

maximum power dissipation. Connect GND to the exposed pad directly under the IC.

Active-Low, Input Voltage Status Indicator. POK is an open-drain output that asserts low

when 2.35V < VIN < 7V (7.5V for MAX8845X only) and (VIN - VBATT) > 40mV. If VIN >

6

6

POK

+7.5V (+8.0V for MAX8845X only) or VBATT > VIN the IC is shut down and POK becomes

high impedance. Connect a pullup resistor to the microprocessor’s I/O voltage when

interfacing with a microprocessor logic input.

7

—

ABO

Active-High, Autobooting Logic Output. See the Autobooting Assistant section and Table

1 for autobooting conditions.

—

7

ABO

Active-Low, Open-Drain Logic Output. See the Autobooting Assistant section and Table

1 for autobooting conditions.

8

8

BATT Li+ Battery Connection. Bypass BATT to GND with a 2.2µF ceramic capacitor.

9

9

MIN

Top-Off Current Threshold Programmable Input. IMIN (mA) falling = 148V/RMIN (kΩ) + 22

( m A) .

Active-Low, Charging Indicator. CHG is an open-drain output that is pulled low once

10

10

CHG

charging begins. CHG is high impedance when the battery current drops below MIN, or

when the IC is disabled. Connect a pullup resistor to the microprocessor’s I/O voltage

when interfacing with a microprocessor logic input.

11

11

IN

Input Supply Voltage. Bypass IN to GND with a 1µF or larger ceramic capacitor to

improve line noise and input transient rejection.

4.7V (MAX8845Z/MAX8845Y/MAX8845W) or 4.85V (MAX8845X) Regulated LDO Output

12

12

SAFEOUT with Input Overvoltage Protection. Bypass SAFEOUT to GND with a 1µF or larger

ceramic capacitor. SAFEOUT can be used to supply low voltage-rated USB systems.

—

—

EP

Exposed Pad. Connect the exposed pad to a large ground plane for maximum power

dissipation. Connect GND to the exposed pad directly under the IC.

6 _______________________________________________________________________________________

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