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LTC1325 PDF预览

LTC1325

更新时间： 2024-09-27 22:55:51
品牌 Logo 应用领域
凌特 - Linear 电池微处理器
页数 文件大小 规格书
24页 405K
描述
Microprocessor-Controlled Battery Management System

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中文翻译

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LTC1325 数据手册

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LTC1325  
Microprocessor-Controlled  
Battery Management System  
U
FEATURES  
DESCRIPTION  
The LTC®1325 provides the core of a flexible, cost-effec-  
■
Fast Charge Nickel-Cadmium, Nickel-Metal-Hydride,  
Lithium Ion or Lead-Acid Batteries under  
Flexible Current Regulation:  
µP Control  
tive solution for an integrated battery management sys-  
tem. The monolithic CMOS chip controls the fast charging  
of nickel-cadmium, nickel-metal-hydride, lead-acid or  
lithium batteries under microprocessor control. The de-  
vice features a programmable 111kHz PWM constant  
current source controller with built-in FET driver, 10-bit  
ADC, internal voltage regulator, discharge-before-charge  
controller, programmable battery voltage attenuator and  
an easy-to-use serial interface.  
■
– Programmable 111kHz PWM Current Regulator  
with Built-In PFET Driver  
– PFET Current Gating for Use with External Current  
Regulator or Current Limited Transformer  
Discharge Mode  
Measures Battery Voltage, Battery Temperature and  
Ambient Temperature with Internal 10-Bit ADC  
Battery Voltage, Temperature and Charge Time  
Fault Protection  
■
■
■
■
The chip may operate in one of five modes: power shut-  
down, idle, discharge, charge or gas gauge. In power  
shutdown the supply current drops to 30µA and in the idle  
mode,anADCreadingmaybemadewithoutanyswitching  
noise affecting the accuracy of the measurement. In the  
discharge mode, the battery is discharged by an external  
transistor while the battery is being monitored by the  
LTC1325 for fault conditions. The charge mode is termi-  
nated by the µP while monitoring any combination of  
battery voltage and temperature, ambient temperature  
and charge time. The LTC1325 also monitors the battery  
for fault conditions before and during charging. In the gas  
gauge mode the LTC1325 allows the total charge leaving  
the battery to be calculated.  
Built-In Voltage Regulator and Programmable  
Battery Attenuator  
■
■
■
■
■
Easy-to-Use 3- or 4-Wire Serial  
Accurate Gas Gauge Function  
Wide Supply Range: VDD = 4.5V to 16V  
Can Charge Batteries with Voltages Greater Than VDD  
Can Charge Batteries from Charging Supplies Greater  
Than VDD  
µP Interface  
■
Digital Input Pins Are High Impedance in  
Shutdown Mode  
U
APPLICATIONS  
■
System Integrated Battery Charger  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
Battery Charger for up to 8 NiCd or NiMH Cells  
V
DD  
4.5V TO 16V  
+
P1  
IRF9730  
C2  
10µF  
D1  
1N6818  
LTC1325  
REG  
1
2
3
4
5
6
7
8
9
MPU  
18  
17  
16  
15  
14  
13  
12  
11  
10  
R
R13  
TRK  
+
V
DD  
C
L1  
REG  
(e.g. 8051)  
4.7µF  
62µH  
D
OUT  
D
IN  
PGATE  
DIS  
R5  
p1.4  
p1.3  
p1.2  
100Ω  
CS  
V
T
BAT  
BAT  
CLK  
LTF  
MCV  
HTF  
GND  
R
DIS  
C1  
0.1µF  
R1  
R2  
R3  
T
AMB  
THERM 1  
+
BAT  
C
REG  
22µF  
V
IN  
N1  
IRFZ34  
THERM 2  
SENSE  
FILTER  
C
F
R
SENSE  
1µF  
R4  
LTC1325 • TA01  
1
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