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| 型号： | LTC1325CSW#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MANAGMNT SYSTEM18SOIC |
| 标准包装： | 1,000 |
| 功能： | 充电管理 |
| 电池化学： | 铅酸，锂离子，镍镉，镍氢 |
| 电源电压： | 4.5 V ~ 16 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 18-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 18-SOIC |
| 包装： | 带卷 (TR) |
LTC1325
Microprocessor-Controlled
Battery Management System
FEATURES
DESCRIPTIO N
s
s
s
s
s
s
s
s
s
s
s
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Fast Charge Nickel-Cadmium, Nickel-Metal-Hydride,
Lithium Ion or Lead-Acid Batteries under μ P Control
Flexible Current Regulation:
– 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
Built-In Voltage Regulator and Programmable
Battery Attenuator
Easy-to-Use 3- or 4-Wire Serial μ P Interface
Accurate Gas Gauge Function
Wide Supply Range: V DD = 4.5V to 16V
Can Charge Batteries with Voltages Greater Than V DD
Can Charge Batteries from Charging Supplies Greater
Than V DD
Digital Input Pins Are High Impedance in
Shutdown Mode
The LTC ? 1325 provides the core of a flexible, cost-effec-
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.
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 30 μ A and in the idle
mode, an ADC reading may be made without any switching
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 μ P 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
APPLICATIO N S
gauge mode the LTC1325 allows the total charge leaving
the battery to be calculated.
s
System Integrated Battery Charger
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO N
Battery Charger for up to 8 NiCd or NiMH Cells
V DD
+
C2
10 μ F
P1
IRF9730
D1
4.5V TO 16V
1N6818
LTC1325
MPU
(e.g. 8051)
+
C REG
4.7 μ F
1
2
REG
D OUT
V DD
PGATE
18
17
R13
R5
L1
62 μ H
R TRK
p1.4
p1.3
3
4
D IN
CS
DIS
V BAT
16
15
100 ?
p1.2
R1
R2
5
6
7
8
9
CLK
LTF
MCV
HTF
GND
T BAT
T AMB
V IN
SENSE
FILTER
14
13
12
11
10
+
C REG
22 μ F
C1
0.1 μ F
THERM 2
THERM 1
BAT
N1
IRFZ34
R DIS
R3
R4
C F
1 μ F
R SENSE
LTC1325 ? TA01
1
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