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参数资料
| 型号： | LTC4069EDC-4.4#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封装： | 2 X 2 MM, LEAD FREE, PLASTIC, MO-229WCCD-2, DFN-6 |
| 文件页数： | 3/16页 |
| 文件大小： | 197K |
| 代理商： | LTC4069EDC-4.4#PBF |
LTC4069-4.4
11
406944fa
Undervoltage Charge Current Limiting (UVCL)
The LTC4069-4.4 includes undervoltage charge (ΔVUVCL1)
current limiting that prevents full charge current until the
input supply voltage exceeds approximately 220mV above
the battery voltage. This feature is particularly useful if the
LTC4069-4.4 is powered from a supply with long leads (or
any relatively high output impedance).
For example, USB-powered systems tend to have highly
variable source impedances (due primarily to cable
quality and length). A transient load combined with such
impedance can easily trip the UVLO threshold and turn the
charger off unless undervoltage charge current limiting
is implemented.
Consider a situation where the LTC4069-4.4 is operating
under normal conditions and the input supply voltage
begins to droop (e.g., an external load drags the input
supply down). If the input voltage reaches VBAT + ΔVUVCL1
(approximately 220mV above the battery voltage),
undervoltage charge current limiting will begin to reduce
the charge current in an attempt to maintain ΔVUVCL1
between the VCC input and the BAT output of the IC.
APPLICATIONS INFORMATION
The LTC4069-4.4 will continue to operate at the reduced
charge current until the input supply voltage is increased
or constant-voltage mode reduces the charge current
further.
Operation from Current Limited Wall Adapter
By using a current limited wall adapter as the input supply,
the LTC4069-4.4 dissipates signicantly less power when
programmed for a current higher than the limit of the supply
as compared to using a non-current limited supply at the
same charge current.
Consider a situation where an application demands a
600mA charge current for an 800mAh Li-Ion battery. If a
typical 5V (non-current limited) input supply is used, the
charger’s peak power dissipation can exceed 1W.
Now consider the same scenario, but with a 5V input
supply with a 600mA current limit. To take advantage
of the current limited supply, it is necessary to program
the LTC4069-4.4 to charge at a current above 600mA.
Assume that the LTC4069-4.4 is programmed for 750mA
(i.e., RPROG= 1.33k) to ensure that part tolerances maintain
OPERATION
4069 F03
RNOM
RNTC
VCC
–
+
–
+
–
+
TOO COLD
TOO HOT
NTC_ENABLE
0.76 VCC
0.35 VCC
0.016 VCC
6
NTC
Figure 3. NTC Circuit Information
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4069EDC-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Standalone 750mA Li-Ion Battery Charger in 2 × 2 DFN with NTC Thermistor Input |
| LTC4069EDC-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Standalone 750mA Li-Ion Battery Charger in 2 × 2 DFN with NTC Thermistor Input |
| LTC4070 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:Ultralow Voltage Step-Up Converter and Power Manager |
| LTC4070EDDB | 制造商:LINER 制造商全称:Linear Technology 功能描述:Li-Ion/Polymer Shunt Battery Charger System |
| LTC4070EDDB#PBF | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion/Li-Pol 50mA 4.2V 10-Pin DFN EP Bulk 制造商:Linear Technology 功能描述:IC BATTERY CHARGER 50mA DFN-8 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, 50mA, DFN-8 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, 50mA, DFN-8; Battery Type:Li-Ion, Li-Polymer; Battery Charge Voltage:4.2V; Charge Current Max:50mA; Battery IC Case Style:DFN; No. of Pins:8; No. of Series Cells:1; Operating Temperature Min:-40C ;RoHS Compliant: Yes |
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