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参数资料
| 型号： | LTC4110EUHF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 38/52页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY BACKUP MANAGER 38-QFN |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
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LTC4110
APPLICATIONS INFORMATION
R SNS(BAT) = resistor between ?yback transformer and
+
(1 – k3) ? R VREF
V REF
battery
R CSP = R CSP1 + R CSP2
R CSN = R CSN1 + R CSN2
R2
–
k3 ? R VREF
R ICHG = resistor connected between I CHG pin and GND
R IPCC = resistor connected between I PCC pin and GND
R ICAL = resistor connected between I CAL pin and GND.
k2 =
R2
R2 + R3
R3
V CHG
THA
If any programming resistor value on any of the three
pins exceeds 100k, see Flyback Compensation section
for more information.
R1
+
–
R NTC
10k
R0
k1 =
R0 + R1
THB
Pins can be tied together to save components if any of
the currents have the same value. If two pins share a
common programming resistor greater than 100k, only
one compensation circuit is required.
4110 F16
Figure 16. Lead Acid Temperature Compensation
?oat voltage = 2.5V at 25°C with a temperature coef?cient of
–2mV/°C, then R1 = 7256, k1 = 0.580, TCk1 = –10.3m/°C,
Δ V FLOAT = 2.5 – 2.35 = 0.15V, k2 = 0.162, k3 = 0.634.
PROGRAMMING CURRENT
Charge/calibration currents are programmed using the
following equations:
If the TYPE pin is set for SLA/LEAD ACID, then the I PCC
pin is not used. You can leave the I PCC pin open.
PROGRAMMING BACKUP MODE ENTRY THRESHOLD
AND CALIBRATION MODE BACK-DRIVE VOLTAGE
DETECTION THRESHOLD
A resistor divider connected to supply input sets both the
backup mode entry threshold and the calibration mode
back-drive voltage detection threshold.
R CSP
? CSP
? CSN
= BACKUP
V OVP
I CHG =
I PCC =
I CAL =
V BGR
R SNS ( BAT )
V BGR
R SNS ( B A T )
V BGR
R SNS ( BAT )
?
R ICHG
R
R IPCC
R
R ICAL
R2
V BACKUP =
R1
V BACKDRIVE =
R2 V
R1 V BGR
where:
+ 1 ? V BGR
? V BACKUP
V BGR
1
where:
I CHG = bulk charge current
I PCC = preconditioning charge current
I CAL = calibration current
V BGR = 1.220V
V BACKUP = supply voltage when backup starts, it should
not be programmed to less than 4.5V
V BACKDRIVE = supply voltage when calibration is terminated,
it should not be programmed to more than 20V
V OVP = DCDIV pin back-drive detect threshold in calibration
mode, typically 1.5V (see V OVP )
4110fb
38
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