Datasheet

LTC4011
20
4011fb
applicaTions inForMaTion
Figure 8. Full-Featured 2A LTC4011 Application
0.1µF
D1 D2 D3 D4
10µF
6.8µH
10µF
FROM
ADAPTER
12V
FAULT
INFET
CHRG
TOC
READY
Figure 9. LTC4011 with MCU Interface
0.1µF
10µF
22µH
NiMH PACK
WITH 10k NTC
(1Ahr)
FAULT
CHRG
TOC
READY
PAUSE
FROM
MCU
INFET
FROM
ADAPTER
24V
While the LTC4011 is a complete, standalone solution,
Figure 9 shows that it can also be interfaced to a host
microprocessor. The host MCU can control the charger
directly with an open-drain I/O port connected to the V
TEMP
pin, if that port is low leakage and can tolerate at least
2V. The charger state is monitored on the four LTC4011
status outputs. Charging of NiMH batteries is selected in
this example. However, NiCd (CHEM
→ V
RT
) parameters
could be chosen as well.