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| 型号： | LTC4110EUHF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 37/52页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY BACKUP MANAGER 38-QFN |
| 标准包装： | 52 |
| 功能： | 备份管理 |
| 电池化学： | 铅酸，锂离子，锂聚合物，镍镉，镍氢，超级电容器 |
| 电源电压： | 4.5 V ~ 19 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-WFQFN 裸露焊盘 |
| 供应商设备封装： | 38-QFN（5x7） |
| 包装： | 管件 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
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LTC4110
APPLICATIONS INFORMATION
PROGRAMMING CHARGE VOLTAGE
Depending on the battery chemistry chosen by the TYPE
pin, a charge termination voltage or a ?oat voltage will be
required. The difference between the two is time. A ?oat
voltage is applied to a battery forever. The V CHG pin is used
to set any of these voltages and the equations remain the
β = exponential temperature coef?cient of resistance
The LTC4110 is designed to work best with a 5% 10k NTC
thermistor with a β near 3750, such as the Siemens/EPCOS
B57620C103J062. In this case, R1 = 7256 Ω .
R1
same. For this document, we will use the term ?oat voltage
generically. If nickel chemistry is chosen, the V CHG pin is
THA
+
V BGR
disabled placing the charger in constant current mode. If
you are using a smart battery, wake-up charge is subject
to the V CHG pin setting when active.
Connecting the V CHG pin to GND will set the default per
cell ?oat voltage (4.2V for Li-ion, 2.35V for SLA). If a dif-
R NTC
THB
HI_REF
REF LO_REF
+
–
+
–
TH_HI
TH_LO
LOGIC
RES_OR
RES_HOT
ferent ?oat voltage is needed, tie the V CHG pin to a voltage
between 0.25 V BGR and 0.75 V BGR using a resistor divider
on the V REF pin. Unlike V REF , V BGR is an internal reference
voltage of the same voltage as V REF but with a much tighter
(±0.5%) tolerance than V REF .
4110 F15
Figure 15. Lead Acid Thermistor
LEAD ACID BATTERY TEMPERATURE COMPENSATION
To program the temperature compensation for SLA charg-
V FLOAT = 2 ?
V CHG
V BGR
1 ? 0.6
ing, an external circuit is needed as shown in Figure 16.
The values are given by:
where
Δ V FLOAT = Adjusted Float Voltage – Default Float Voltage
R1 = R0 ?
β ? 2 ? T0
β + 2 ? T0
TCk1 = –
V CHG = V CHG Pin Voltage,
V BGR = 1.220V
The resistor divider connected to V REF pin will affect timer
(see the Programming Charge Time with TIMER and V REF
k1 =
R0
R0 + R1
β ? R1 ? R0
(R1 + R0) 2 ? T0 2
Pins section for more details).
THERMISTOR FOR LEAD ACID BATTERIES
When the TYPE pin is programmed for Lead Acid, THA
pin will be force to V BGR , THB will be used to sense the
k2 =
k3 =
TCV FLOAT
1.2 ? TCk1
0.5 + Δ V FLOAT / 1.2 ? k1 ? k2
1 ? k2
R1 = R0 ?
NTC resistance. The value of R1 is given by:
β ? 2 ? T0
β + 2 ? T0
where:
R0 = thermistor resistance ( Ω ) at T0
T0 = thermistor reference temperature (°K)
where:
TCV FLOAT = temperature coef?cient of the ?oat voltage
(Range: –2mV/°C – –6mV/°C)
Δ V FLOAT = ?oat voltage at 25°C – default ?oat voltage
2.35V (Range: –0.15V – 0.15V)
For example, if a 10k NTC with β = 3750 is used, desired
4110fb
37
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相关代理商/技术参数 |
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| LTC4110EUHF-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Battery Backup System Manager |
| LTC4110EUHF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Battery Backup System Manager |
| LTC4120IUD#PBF | 制造商:Linear Technology 功能描述:BATTERY CHARGER, 400MA, QFN-16, Battery Type:Li-Ion, Li-Polymer, Input Voltage:4 |
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| LTC4150_1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Coulomb Counter/ Battery Gas Gauge |
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