LX2207ILD データシートの表示（PDF） - Microsemi Corporation
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LX2207ILD Datasheet PDF : 14 Pages
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LX2207
Three Level Lithium Ion Battery Charger
®
TM
PRODUCTION DATA SHEET
APPLICATION NOTE
POWER STATUS INDICATORS
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.
Conditions
Charge in process
Charge completed
STAT
Low
High
INPUT POWER SOURCE DETECTION
In order to detect when the input power source has been
removed, the LX2207 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
15k
IN
CMP
1k 0.47uF LX2207
4.25
4.20
4.15
4.10
4.05
4.00
3.95
3.90
0.0
CHARGING PROFILE
Battery Charging USB High Level
Vbat
Ibat
60.0
Time in minutes
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
120.0
CONDITIONING CURRENT
60
50
40
30
20
10
0
0.00
Conditioning Current vs IHCP
50.00
100.00
IHCP (in uA)
150.00
Copyright © 2007
Rev. 1.0a, 2007-10-08
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 10
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