Rainbow-electronics MAX8903A Manual do Utilizador descarregar pdf (Página 4)

MAX8903A

2A 1-Cell Li+ DC-DC Charger for USB*

and Adapter Power

4 _______________________________________________________________________________________

PARAMETER CONDITIONS MIN TYP MAX UNITS

ISET

= 600Ω 1800 2000 2200

ISET

= 1.2kΩ 900 1000 1100Fast-Charge Current

ISET

= 2.4kΩ 450 500 550

DONE Threshold Percentage of fast-charge, I

BAT

decreasing 10 %

ISET

Resistor Range 0.6 2.4 kΩ

ISET Output Voltage 1.5 V

ISET Current Monitor Gain 1.25 mA/A

No DC or USB input 0.05 4

BAT Leakage Current

With valid input power, V

CEN

= 5V 1 6

µA

Charger Soft-Start Time 1.0 ms

Charger Thermal Limit

Temperature

100 °C

Charger Thermal Limit Gain Charge current = 0 at + 120°C 5 %/°C

CHARGER TIMER

Prequalification Time C

= 0.15µF 33 min

Fast-Charge Time C

= 0.15µF 660 min

Timer Accuracy -15 +15 %

Timer Extend Current Threshold

Percentage of fast-charge current below which the timer

clock operates at half-speed

40 50 60 %

Timer Suspend Current Threshold

Percentage of fast-charge current below which timer

clock pauses

16 20 24 %

Charge Done Delay Time

From done threshold detection until charger turns off and

CHG goes high

15 s

THERMISTOR MONITOR

THM Threshold, Hot When charging is suspended, 1% hysteresis

0.27 x

0.28 x

0.29 x

THM Threshold, Cold When charging is suspended, 1% hysteresis

0.73 x

0.74 x

0.75 x

THM Threshold, Disabled THM function is disabled below this voltage

0.0254

x V

0.03 x

0.036 x

THM = GND or VL; T

= +25°C -0.1 +0.001 +0.2

THM Input Leakage

THM = GND or VL; T

= +85°C 0.01

µA

THERMAL SHUTDOWN, VL, AND LOGIC I/O: CHG, FLT, DOK, UOK, DCM, CEN, USUS, IUSB

High level 1.3

Low level 0.4

Logic-Input Thresholds

(DCM, CEN, USUS, IUSB)

Hysteresis 50 mV

= +25°C 0.001 1

Logic-Input Leakage Current

(DCM, CEN, USUS, IUSB)

INPUT

= 0 to 5.5V

= +85°C 0.01

µA

ELECTRICAL CHARACTERISTICS (continued)

= V

USB

= 5V, V

BAT

= 4V, circuit of Figure 2, T

= -40°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

(Note 1)

1 2 3 4 5 6 7 8 9 ... 19 20

MAX8903A 1

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