參數(shù)資料
型號(hào)： LT1325
廠商： Linear Technology Corporation
英文描述： Microprocessor-Controlled Battery Management System
中文描述： 微處理器控制的電池管理系統(tǒng)
文件頁(yè)數(shù)： 1/24頁(yè)
文件大?。?/td> 330K
代理商： LT1325
1
LTC1325
Microprocessor-Controlled
Battery Management System
DESCRIPTIO
N
U
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
gauge mode the LTC1325 allows the total charge leaving
the battery to be calculated.
FEATURES
I
Fast Charge Nickel-Cadmium, Nickel-Metal-Hydride,
Lithium Ion or Lead-Acid Batteries under
μ
P Control
I
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
I
Discharge Mode
I
Measures Battery Voltage, Battery Temperature and
Ambient Temperature with Internal 10-Bit ADC
I
Battery Voltage, Temperature and Charge Time
Fault Protection
I
Built-In Voltage Regulator and Programmable
Battery Attenuator
I
Easy-to-Use 3- or 4-Wire Serial
μ
P Interface
I
Accurate Gas Gauge Function
I
Wide Supply Range: V
DD
= 4.5V to 16V
I
Can Charge Batteries with Voltages Greater Than V
DD
I
Can Charge Batteries from Charging Supplies Greater
Than V
DD
I
Digital Input Pins Are High Impedance in
Shutdown Mode
I
System Integrated Battery Charger
APPLICATIO
S
U
TYPICAL APPLICATIO
N
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
Battery Charger for up to 8 NiCd or NiMH Cells
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
V
DD
PGATE
DIS
V
BAT
T
BAT
T
AMB
V
IN
SENSE
FILTER
LTC1325
REG
D
OUT
D
IN
CS
CLK
LTF
MCV
HTF
GND
+
R1
C
REG
4.7
μ
F
THERM 2
THERM 1
R5
R
DIS
R
TRK
R
SENSE
LTC1325 TA01
L1
62
μ
H
BAT
N1
IRFZ34
V
4.5V TO 16V
R13
R2
R3
R4
C
F
1
μ
F
MPU
(e.g. 8051)
p1.4
p1.3
p1.2
+
C2
10
μ
F
+
C
REG
22
μ
F
C1
0.1
μ
F
100
D1
1N6818
P1
IRF9730
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