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参数资料
| 型号： | LTC4110EUHF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 39/52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
R1 = resistor connected between DCDIV and GND
R2 = resistor connected between supply input and
DCDIV
V BGR = reference voltage 1.220V
For example, if supply input = 12V and backup starts when
it drops to 11V, then V BACKUP = 11V, V BACKDRIVE = 13.5V,
R2/R1 = 8.02, choose R1 = 10k, then R2 = 80.6k.
If a higher ratio than V OVP /V BGR = 1.23 is desired between
V BACKDRIVE and V BACKUP , a third resistor can be used as
shown in Figure 17.
SUPPLY
INPUT
For example, if supply input = 12V and backup starts when
it drops to 8V, calibration terminates when it rises to 16V,
and V DC = V DD = 4.75V, then R2/R1 = 21.87, R3/R1 = 3.88,
choose R1 = 10k then R2 = 221k and R3 = 39.2k.
If the noise on supply input is a problem, a capacitor can
be connected between DCDIV and GND.
PROGRAMMING CALIBRATION/BACKUP CUT-OFF
THRESHOLD
The pins V CAL and V DIS are used to calculate custom
discharge cut-off voltages for their respective operating
modes. The equations shown below are generic for both.
There is no implied relationship between V CAL and V DIS
OPTIONAL RESISTOR
TO INCREASE THE
1.23 TO 1 RATIO
R3
V DC
R2
DCDIV
V BGR
CMP
BACKUP
for they are independent of each other.
The equations are most helpful if you pick the V CUTOFF
voltage you want, within the range limits offered, and then
R1
1.23 ? V BGR
CMP
BOOST
solve for V CAL or V DIS . With the voltage value of V CAL or
V DIS calculated, determine the necessary voltage divider
network from V REF required to get the calculated voltage
on these pins respectively. It is recommended that one
Figure 17. Backup and Boost Detect Comparators
4110 F17
single series resistor divider network from V REF to ground
be used to obtain all of the pin voltages you need. It should
be noted that custom values of V CHG would also affect the
= BACKDRIVE BACKUP ?
V BACKDRIVE – 1 . 23 ? V BACKUP
R 3 V DC V BACKD R IVE – V BACKUP
R2 V – V
R 1 0 . 23 ? V BGR
? 1
0 . 23 ? V DC
= ?
R 1 V BGR V BACKDRIVE – 1 . 23 ? V BACKUP
?
divider network complexity. See Programming Charge
Voltage section for more information.
Connect the V CAL or V DIS pin to GND will set the default
calibration/backup cut-off threshold (2.75V for Li-Ion,
1.93V for SLA, 0.95V for NiMH/NiCd). These threshold
voltages can be adjusted (±400mV for Li-Ion, ±300mV
for SLA, ±200mV for NiMH/NiCd) by tying the pin to ap-
propriate voltage on the V REF pin resistor divider according
V CAL / V DIS
0 . 23 ? V D C
V BACKDRIVE – 1 . 23 ? V BACKUP
? 1
to the following equations:
V CUTOFF =
V BGR
? 4 . 2 ( Li ? Ion )
where:
V DC = Any regulated DC voltage available in the system
such as SMBus pull up, LED supply or LTC4110’s V DD
voltage, must be higher than 1.7V. R3 = resistor connected
between V DC and DCDIV.
V CUTOFF =
V CUTOFF =
V C A L / V DIS
V BGR
V CAL / V DIS
V BGR
? 2 . 35 ( SLA )
? 2 ( NiMH / NiCD )
4110fb
39
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