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| 型号： | LTC4011CFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/26页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER HIEFF 20TSSOP |
| 标准包装： | 74 |
| 功能： | 充电管理 |
| 电池化学： | 镍镉（NiCd）、镍金属氢化物（NiMH） |
| 电源电压： | 4.5 V ~ 34 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 20-TSSOP-EP |
| 包装： | 管件 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
LTC4011
APPLICATIONS INFORMATION
Table 2. LTC4011 Charging Parameters
STATE
PC
FC
CHEM
PIN
Open
GND
BAT
CHEMISTRY
Both
NiCd
NiMH
TIMER
t MAX /12
t MAX
t MAX
T MIN
5°C
5°C
5°C
T MAX
45°C
60°C
60°C
I CHRG
I PROG /5
I PROG
I PROG
TERMINATION CONDITION
Timer Expires
–20mV per Cell or 2°C/Minute
1.5°C/Minute for First t MAX /12 Minutes if Initial
V CELL < 1.325V
–10mV per Cell or 1°C/Minute After t MAX /12 Minutes
or if Initial V CELL > 1.325V
TOC
AR
GND
NiMH
Both
t MAX /3
5°C
5°C
60°C
45°C
I PROG /10 Timer Expires
0
V CELL < 1.325V
PC: Precharge
FC: Fast Charge (Initial –?V Termination Hold Off of t MAX /12 Minutes May Apply)
TOC: Top-Off Charge (Only for NiMH ?T/?t FC Termination After Initial t MAX /12 Period)
AR: Automatic Recharge (Temperature Limits Apply to State Termination Only)
Table 3. LTC4011 Time Limit Programming Examples
R TIMER
24.9k
33.2k
49.9k
66.5k
100k
TYPICAL FAST
CHARGE RATE
2C
1.5C
1C
0.75C
C/2
PRECHARGE LIMIT
(MINUTES)
3.8
5
7.5
10
15
FAST CHARGE
VOLTAGE STABILIZATION
(MINUTES)
3.8
5
7.5
10
15
FAST CHARGE LIMIT
(HOURS)
0.75
1
1.5
2
3
TOP-OFF
CHARGE
(MINUTES)
15
20
30
40
60
Programming Maximum Charge Times
Connecting the appropriate resistor between the TIMER
pin and GND programs the maximum duration of various
charging states. To some degree, the value should reflect
how closely the programmed charge current matches the
1C rate of targeted battery packs. The maximum fast charge
period is determined by the following equation:
The proper circuit for multicell packs is shown in Figure 3.
The ratio of R2 to R1 should be a factor of (n – 1), where
n is the number of series cells in the battery pack. The
value of R1 should be between 1k and 100k. This range
limits the sensing error caused by V CELL leakage current
and prevents the ON resistance of the internal NFET be-
tween V CDIV and GND from causing a significant error in
the V CELL voltage. The external resistor network is also
used to detect battery insertion and removal. The filter
formed by C1 and the parallel combination of R1 and R2
Some typical timing values are detailed in Table 3. R TIMER
should not be less than 15k. The actual time limits used
by the LTC4011 have a resolution of approximately ±30
seconds in addition to the tolerances given the Electrical
Characteristics table. If the timer ends without a valid –?V or
?T/?t charge termination, the charger enters the fault state.
The maximum time period is approximately 4.3 hours.
BAT 12
LTC4011
V CELL 8
V CDIV
9
FOR TWO OR
MORE SERIES CELLS
+
R2
R1 C1
Cell Voltage Network Design
GND
5
R2 = R1(n – 1)
An external resistor network is required to provide the
average single-cell voltage to the V CELL pin of the LTC4011.
4011 F03
Figure 3. Mulitple Cell Voltage Divider
4011fb
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