MAX8903A Просмотр технического описания (PDF) - Maxim Integrated

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MAX8903A

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

Maxim Integrated 

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

and Adapter Power

PIN

22

23, 24

25, 26

27, 28

—

NAME

CHG

SYS

CS

LX

EP

Pin Description (continued)

FUNCTION

Charger Status Output. Active-low, open-drain output pulls low when the battery is in fast-charge or

prequal. Otherwise, CHG is high impedance.

System Supply Output. SYS connects to BAT through an internal 50mΩ system load switch when DC or

USB are invalid, or when the SYS load is greater than the input current limit.

When a valid voltage is present at DC or USB, SYS is limited to 4.4V. When the system load (ISYS)

exceeds the DC or USB current limit, SYS is regulated to 50mV below BAT, and both the powered input

and the battery service SYS.

Bypass SYS to GND with a 10µF X5R or X7R ceramic capacitor. Both SYS pins must be connected

together externally.

70mΩ Current-Sense Input. Connect the step-down inductor from LX to CS. When the step-down

regulator is on, there is a 70mΩ current-sense MOSFET from CS to SYS. When the step-down regulator is

off, the internal CS MOSFET turns off to block current from SYS back to DC.

Inductor Connection. Connect the inductor between LX and CS. Both LX pins must be connected together

externally.

Exposed Pad. Connect the exposed pad to GND. Connecting the exposed pad does not remove the

requirement for proper ground connections to the appropriate pins.

10 ______________________________________________________________________________________

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