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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

ELECTRICAL CHARACTERISTICS (continued)

(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

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

Prequalification Charge Current

Percentage of the fast-

charge current, VBATT TA = 0°C to +85°C

5

10

15

%

= 2.2V

CHG, POK Output Low Threshold

CHG, POK Output High Leakage Current

POK Threshold

DETBAT, SAFEOUT

DETBAT Logic-Input Low Threshold

DETBAT Logic-Input High Threshold

DETBAT Pullup Resistor

Minimum SAFEOUT Bypass Capacitance

SAFEOUT Regulated Output

SAFEOUT Current Limit

EN, ABI, ABO, ABO

EN, ABI Internal Pulldown Resistor

EN Logic-Input Low Threshold

EN Logic-Input High Threshold

ABI Logic-Input Low Threshold

ABI Logic-Input High Threshold

ABO Output Low Threshold (MAX8845Y/

MAX8845X/MAX8845W)

IPOK = 5mA , ICHG = 5mA

VPOK = 5.5V,

V CHG = 5.5V

TA = +25°C

TA = +85°C

VIN - VBATT

VIN rising

VIN falling

0.4

V

1

µA

0.01

40

mV

30

0.4

V

1.3

DETBAT to VL = 3V

470

kΩ

1

µF

ISAFEOUT = 30mA, VIN = 5V, TA = 0°C to

+85°C (MAX8845Z/MAX8845Y/MAX8845W)

4.5

4.7

4.9

V

ISAFEOUT = 20mA, VIN = 5V, TA = 0°C to

+85°C (MAX8845X)

4.75 4.85 5.0

100

mA

100

200

400

kΩ

4.25V (4.4V for MAX8845W only) ≤ VIN ≤ 7V

0.4

V

4.25V (4.4V for MAX8845W only) ≤ VIN ≤ 7V 1.3

V

VBATT = 4V, VIN = 0

0.4

V

VBATT = 4V, VIN = 0

1.3

V

Open drain, IABO(SINK) = 1mA

0.4

V

ABO Output High Threshold (MAX8845Y/

Open drain, 100kΩ pullup to BATT

VBATT -

V

MAX8845X/MAX8845W)

0.4V

ABO Output Low Threshold

(MAX8845Z)

IABO(SINK) = 1mA

0.4

V

ABO Output High Threshold (MAX8845Z)

IABO(SOURCE) = 1mA

VBATT -

0.4V

V

THERMAL

Die Temperature Regulation Threshold

115

°C

Note 1: Specifications are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by

design and characterization.

_______________________________________________________________________________________ 3

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