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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

ABSOLUTE MAXIMUM RATINGS

IN to GND ...............................................................-0.3V to +30V

ABI, BATT, EN, POK, ABO, ABO, CHG, DETBAT, SETI, MIN,

SAFEOUT to GND ................................................-0.3V to +6V

IN to BATT Continuous Current .........................................1ARMS

Continuous Power Dissipation (TA = +70°C)

12-Thin QFN (derate 14.7mW/°C above +70°C)

(multilayer PCB) ......................................................1176.5mW

BATT Short-Circuit Duration .......................................Continuous

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(VIN = 5V, VBATT = 4V, RPOK = 1MΩ to BATT, EN = unconnected, RSETI = 2.8kΩ to GND, VDETBAT = 0, CBATT = 2.2µF, TA = -40°C to

+85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Input Supply Voltage Range

0

28

V

Input Supply Operating Voltage Range

MAX8845W only

4.25

7.00

V

4.40

7.00

Overvoltage Lockout Trip Threshold

VIN rising, 100mV hysteresis (typ)

MAX8845X only

7.0

7.5

8.0

V

7.5

8.0

8.5

Input Current

BATT, CHG, POK

Constant current charging

IIN - IBATT, IBATT = 0

Constant current charging

IIN - IBATT, IBATT = 500mA

IC disabled, VEN = 5V

VIN = 4V,

VBATT = 4.2V (4.35V for

MAX8845W only)

TA = +25°C

TA = +85°C

0.22 0.50

1

mA

0.20 0.50

0.02

0.03

Minimum BATT Bypass Capacitance

VBATT Prequalification Threshold Voltage

Battery Regulation Voltage

Regulator Dropout Voltage (VIN - VBATT)

BATT Input Current

2.2

µF

VBATT rising, 100mV hysteresis (typ)

2.3

2.5

2.7

V

IBATT = 0

MAX8845W only

4.175 4.200 4.225

TA = -40°C to +85°C 4.158 4.200 4.242

V

4.324 4.350 4.376

4.306 4.350 4.394

VBATT = 4.1V, IBATT = 425mA

260

mV

VIN = 0 to 4V,

VBATT = 4.2V (4.35V for MAX8845W only)

5

10

µA

IC disabled

3

Current-Sense Amplifier Gain (IBATT to ISETI)

Fast-Charge Current

IBATT = 500mA

VBATT = 3.5V,

RSETI = 2.8kΩ

VBATT = 3.5V,

RSETI = 14kΩ

TA = 0°C to +85°C

TA = -40°C to +85°C

TA = 0°C to +85°C

1016

460

500

540

425

500

575

85

100

115

µA/A

mA

CHG Top-Off Threshold

IBATT falling, battery is charged

RMIN = 1.75kΩ

106

mA

2 _______________________________________________________________________________________

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