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LTC4007-1 PDF预览

LTC4007-1

更新时间： 2023-12-20 18:44:20
品牌 Logo 应用领域
亚德诺 - ADI 电池
页数 文件大小 规格书
24页 302K
描述
4A、高效率、锂离子电池充电器

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中文翻译

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LTC4007-1 数据手册

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LTC4007-1  
4A, High Efficiency,  
Li-Ion Battery Charger  
FeaTures  
DescripTion  
The LTC®4007-1 is a constant-current/constant-voltage  
charger controller for 3- or 4-cell lithium-ion batteries.  
The PWM controller uses a synchronous, quasi-constant  
frequency, constant off-time architecture that will not  
generate audible noise even when using ceramic capaci-  
tors. Charging current is programmable to 4% accuracy  
usingaprogrammingresistor.Chargingcurrentcanalsobe  
monitored as a voltage across the programming resistor.  
n
Charger Controller for 3- or 4-Cell  
Lithium-Ion Batteries  
n
High Conversion Efficiency: Up to 96%  
n
Output Currents Exceeding 4A  
±±.ꢀ% Charging Voltage Accuracy  
n
n
Built-In Charge Termination for Li-Ion Batteries  
n
AC Adapter Current Limiting Maximizes Charge Rate*  
n
Thermistor Input for Temperature Qualified Charging  
n
Wide Input Voltage Range: 6V to 28V  
The output float voltage is pin programmed for cell count  
(3 cells or 4 cells) and chemistry (4.2V/4.1V). A timer, pro-  
grammedbyanexternalresistor,setsthetotalchargetime.  
n
0.5V Dropout Voltage; Maximum Duty Cycle: 98%  
n
Programmable Charge Current: 4% Accuracy  
n
Indicator Outputs for Charging, C/10 Current  
The LTC4007-1 includes a thermistor input, which  
suspends charging if an unsafe temperature condition  
is detected. If the cell voltage is less than 3.25V, a low-  
battery indicator asserts and can be used to program a  
trickle charge current to safely charge depleted batteries.  
The FAULT pin is also asserted and charging terminates  
if the low-battery condition persists for more than 1/4 of  
the total charge time.  
Detection, AC Adapter Present, Low Battery, Input  
Current Limiting and Faults  
n
Charging Current Monitor Output  
n
Available in a 24-Pin 4mm × 5mm QFN Package  
applicaTions  
n
Notebook Computers  
n
Portable Instruments  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
n
Battery-Backup Systems  
No R  
is a trademark of Linear Technology Corporation. All other trademarks are the  
SENSE  
property of their respective owners.  
n
Li-Ion Chargers  
Protected by U.S. Patents including 5723970.  
Typical applicaTion  
12.6V, 4A Li-Ion Battery Charger  
INPUT SWITCH  
DCIN  
0V TO 28V  
LOW BATTERY  
THRESHOLD (Per Cell)  
(4.2V/4.1V)  
0.1µF  
AUTO  
4.99k  
15nF  
PART  
RESTART  
3C4C  
DCIN  
INFET  
CLP  
V
LOGIC  
LTC4007-1  
LTC4007  
NO  
3.25V/3.173V  
2.5V/2.44V  
0.025Ω  
100k  
100k 100k  
CHEM  
LOBAT  
YES  
SYSTEM  
LOAD  
LOBAT  
I
CL  
I
LTC4007-1 CLN  
TGATE  
CL  
20µF  
ACP  
SHDN  
FAULT  
CHG  
ACP  
Q1  
10µH  
0.025Ω  
SHDN  
BGATE  
Li-Ion  
BATTERY  
Q2  
FAULT  
CHG  
PGND  
CSP  
20µF  
3.01k  
FLAG  
FLAG  
NTC  
BAT  
32.4k  
3.01k  
PROG  
ITH  
CHARGING  
CURRENT  
MONITOR  
R
T
THERMISTOR  
0.0047µF  
26.7k  
0.47µF  
309k  
GND  
6.04k  
0.12µF  
10k  
NTC  
Q1: Si4431BDY  
Q2: FDC645N  
TIMING RESISTOR  
(~2 HOURS)  
40071 TA01  
40071fa  
1
For more information www.linear.com/LTC4007-1  
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