MAX8568AETE(2004) 查看數據表（PDF） - Maxim Integrated

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MAX8568AETE
(Rev.:2004)

Complete Backup-Management ICs for Lithium and NiMH Batteries

Maxim Integrated 

Complete Backup-Management ICs

for Lithium and NiMH Batteries

1.12V

BK

CHARGER

IN

50µs

2.43V

INOK

I/O IN

I/O OUT

STEP-UP DC-DC CONVERTER

OD1

MEM IN

MEM OUT

LDO

OD2

Figure 1. Timing Diagram

Applications Information

Setting the Charge Current

Charge current is set by a resistor connected from CHGI

to GND (R5 in Figure 7). The acceptable resistor range is

from 50kΩ to 1800kΩ. Charge current is calculated by

the following.

Charge Current = 1690 / RCHGI +

(VIN - VBK - 2.3) x (1.05mA/V)

where VBK is the nominal voltage of the charged back-

up battery. For lithium batteries charging at low cur-

rents, desired RCHGI may need to be determined

emperically. This is the fast-charge current for both

NiMH and lithium batteries. For NiMH batteries, the

trickle charge is 10% of the fast-charge current.

Using a Rechargeable Lithium

Backup Battery

The MAX8568 can charge a lithium-type backup bat-

tery from the main battery connected at IN. Connect

NI/LI to GND for lithium backup battery charging.

STRTV is unused and should be connected to GND in

lithium charge mode.

10 ______________________________________________________________________________________

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