lx2206 Microsemi Corporation, lx2206 Datasheet - Page 10

• Manufacturer Part Number: lx2206
• Description: Dual Level Lithium Ion Battery Charger
• Manufacturer: Microsemi Corporation

Copyright © 2007
Rev. 1.3a, 2007-08-28
P
The STAT pin is designed to source or sink current. LEDs
can be configured to indicate charging or battery full. The
battery full indicator can be connected to DCOK rather than
GND to insure it is off when the input power is removed
and the STAT pin and DCOK pin go to a high impedance
state.
The final circuit for this example is:
The TMP voltages with this circuit are:
OWER
TEMP (°C)
TM
-20
25
60
80
0
S
TATUS
Charge in process
Charge completed
Input power removed
I
Conditions
NDICATORS
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
TMP
RNTC
24.9k
12.6k
971k
327k
100k
V
IN
24.9k
121k
R
NTC
VTMP (% VIN)
STAT
High
Low
Hi Z
89%
74%
51%
29%
24%
A P P L I C A T I O N N O T E
Analog Mixed Signal Group
®
Microsemi
Dual Level Lithium Ion Battery Charger
I
removed, the LX2206 requires that a small current (up to
200uA) momentarily flow out of the IN pin (in the reverse
direction). Once detected, the reverse IN current is shut off
(the IN pin becomes a very high impedance until an input
power source is later reapplied). In most applications, there
is sufficient loading on the IN pin from external circuitry to
accomplish this, which includes the “Full” and/or “Power
On” LED loads and the TFB resistor string. If there is no
external load on the IN pin, then it is recommended to
provide a 15k resistor from IN to GND as shown below.
Adapter or USB
NPUT
In order to detect when the input power source has been
P
OWER
P
RODUCTION
S
15k
OURCE
D
ETECTION
1k
D
ATA
0.47uF
S
HEET
IN
CMP
LX2206
LX2206
Page 10