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參數(shù)資料
| 型號： | LX2205 |
| 廠商： | Microsemi Corporation |
| 英文描述： | 1A Li-Ion Battery Charger with Power Source Management |
| 中文描述： | 1A條鋰離子電池充電器與電源管理 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 331K |
| 代理商： | LX2205 |
LX2205
P
RODUCTION
D
ATA
S
HEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 11
Copyright
2007
Rev. 1.0a, 2007-03-02
W
M
.
C
1A Li-Ion Battery Charger with Power Source Management
TM
L
X
2
2
0
5
T H E O R Y O F O P E R A T I O N / A P P L I C A T I O N N O T E
MDC,
USB
OR-ING,
UVLO
A
ND
DC
OK
The power path from the USB input to the SYS pin
consists of a current limiter and a bidirectional switch
(capable of blocking current in either direction). The USB
input is switched off when at least one of the following
conditions exists:
1.
V
USB
< V
USB
UVLO
2.
USB Suspend pin is asserted.
3.
V
MDC
> V
USB
4.
V
MDC
> V
OK
DC
_THRESHOLD
The MDC input is a monitoring input only, it is not a
high current input. When the voltage at SYS exceeds the
UVLO level, (typically 3.7V), the charger portion of the
circuit is activated. The
OK
DC
both of the following conditions are true:
1.
V
MDC
> V
OK
DC
_THRESHOLD
2.
V
SYS
> V
BAT
Therefore when using a current limited wall adapter it is
possible to charge the battery and not assert the
output.
output is pulled low when
OK
DC
P
ROTECTION
F
EATURES
Conditioning Current Mode – If the battery terminal
voltage is less than 2.7V, the battery charger will reduce the
charge current to 5% of full scale. This also protects the
appliance from overheating by trying to drive the full
charging current into a short circuited battery.
Under Voltage Lockout – The charger remains inactive
until the under voltage lockout threshold is exceeded at the
SYS pin.
Thermal Control Loop – The power dissipation of the
charger is limited by reducing the charge current with a
control loop to prevent the die temperature from exceeded
approximately 140
°C.
Reverse Current Blocking – Current will not flow out of
the USB pin.
Shutdown Mode – If the SHDN pin is logic high, the
charger enters a shutdown mode to prevent draining the
battery.
Battery Temperature Lockout – If an unsafe temperature is
sensed by the TFB input window comparator, battery
charging is suspended.
L
AYOUT
G
UIDELINES
It is important when laying out the LX2205 to place
10μF ceramic capacitors as close to the SYS, USB and
VBAT IC terminals as possible to filter switching
transients.
It is important to provide a low thermal impedance path
from the thermal pad on the bottom of the LX2205
package to the ground plane of the circuit board to
maximize heat dissipation. Generally this is
accomplished by the use of multiple thermal vias.
The compensation capacitor should be placed close to
the CMP pin and connected with a short trace.
C
HARGE
C
URRENT
P
ROGRAMMING
The CCP, CTP, and CUS programming pins are used to
program the constant charge current, termination current,
and USB current, respectively. These pins utilize regulated
output voltages that produce a program current across an
external resistor to GND.
The following tables are guidelines for selecting the proper
resistor values:
Constant Charge Current (in mA)
50
100
200
300
400
500
600
700
800
900
1000
R
CCP
1270k
604k
294k
187k
137k
107k
88.7k
75.0k
63.4k
56.2k
49.9k*
* R
CCP
minimum value
Termination Current (in mA)
5
10
20
40
60
80
100
120
140
160
180
200
R
CTP
237k
105k
51.1k
24.9k
15.8k
11.8k
9.09k
7.50k
6.34k
5.49k
4.75k
4.22k
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LX2205ILQ | 1A Li-Ion Battery Charger with Power Source Management |
| LX2206 | Dual Level Lithium Ion Battery Charger |
| LX2206ILD | Dual Level Lithium Ion Battery Charger |
| LX2207 | Three Level Lithium Ion Battery Charger |
| LX2207ILD | Three Level Lithium Ion Battery Charger |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LX2205 EVAL KIT | 制造商:Microsemi Corporation 功能描述:LINEAR - LITHIUM ION - Bulk |
| LX2205ILQ | 制造商:Microsemi Corporation 功能描述:LINEAR - LITHIUM ION - Bulk |
| LX2206 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Dual Level Lithium Ion Battery Charger |
| LX2206 EVAL KIT | 制造商:Microsemi Corporation 功能描述:LINEAR - LITHIUM ION - Bulk |
| LX2206_07 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:TM Dual Level Lithium Ion Battery Charger |
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