MAX8845ZETC(2009_03) Просмотр технического описания (PDF) - Maxim Integrated

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MAX8845ZETC
(Rev.:2009_03)

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

Input Supply Voltage Range

Input Supply Operating Voltage Range

Overvoltage Lockout Trip Threshold

CONDITIONS

VIN rising, 100mV hysteresis (typ)

Constant current charging

IIN - IBATT, IBATT = 0

MIN TYP MAX UNITS

0

28

V

4.25

7.00

V

7.0

7.5

8.0

V

0.22 0.50

Input Current

BATT, CHG, POK

Minimum BATT Bypass Capacitance

VBATT Prequalification Threshold Voltage

Battery Regulation Voltage

Regulator Dropout Voltage (VIN - VBATT)

BATT Input Current

Current-Sense Amplifier Gain (IBATT to ISETI)

Fast-Charge Current

Constant current charging

IIN - IBATT, IBATT = 500mA

IC disabled, VEN = 5V

VIN = 4V,

VBATT = 4.2V

TA = +25°C

TA = +85°C

VBATT rising, 100mV hysteresis (typ)

IBATT = 0

TA = -40°C to +85°C

VBATT = 4.1V, IBATT = 425mA

VIN = 0 to 4V,

VBATT = 4.2V

IC disabled

IBATT = 500mA

VBATT = 3.5V,

RSETI = 2.8kΩ

TA = 0°C to +85°C

TA = -40°C to +85°C

VBATT = 3.5V,

RSETI = 14kΩ

TA = 0°C to +85°C

1

0.20 0.50

0.02

0.03

2.3

4.175

4.158

2.2

2.5

4.200

4.200

260

2.7

4.225

4.242

5

10

3

1016

460

500

540

425

500

575

85

100

115

mA

µF

V

V

mV

µA

µA/A

mA

CHG Top-Off Threshold

IBATT falling, battery is charged

RMIN = 1.75kΩ

106

mA

CHG Hysteresis

CHG Detection Delay

IBATT rising after top-off is detected,

RMIN = 1.75kΩ

IBATT falls below top-off threshold

38

mA

4.0

6.2

10.7

ms

2 _______________________________________________________________________________________

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