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參數(shù)資料
| 型號： | LTC4050EMS-4.2#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Lithium-Ion Linear Battery Charger Controller with Thermistor Interface; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +125°C |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 182K |
| 代理商： | LTC4050EMS-4.2#PBF |
8
LTC4050
4050f
APPLICATIONS INFORMATION
WU
U
Figure 1. Microprocessor Interface
Charger Conditions
The charger is off when any of the following conditions exist:
the voltage at the VCC pin is below 4V, the voltage at the VCC
pin is greater than 4V but is less than 54mV above VBAT,
the PROG pin is floating, the timer has timed out or the
thermistor temperature is outside the acceptable range. In
this condition, the DRV pin is pulled to VCC and the internal
resistor divider is disconnected to reduce the current drain
on the battery.
Undervoltage Lockout (UVLO)
An internal undervoltage lockout circuit monitors the input
voltage and keeps the charger in shutdown mode until VCC
rises above the undervoltage lockout threshold of 4V. To
prevent oscillation around VCC = 4V, the UVLO circuit has
built-in hysteresis.
Trickle Charge and Defective Battery Detection
At the beginning of the charging sequence, if the battery
voltage is low (below 2.49V), the charger goes into trickle
mode. In this mode, the charge current is reduced to 10%
of the full-scale current. If the low cell voltage persists for
one quarter of the total charge time, the battery is consid-
ered defective, the charge cycle is terminated and the
CHRG pin output becomes high impedance.
Shutdown
The LTC4050 can be forced into shutdown by floating the
PROG pin and allowing the internal 2.3
A current source
to pull the pin above the 3.6V shutdown threshold voltage.
In shutdown, the DRV pin is pulled up to VCC, turning off
the external P-channel MOSFET and resetting the internal
timer.
Programming Charge Current
The formula for the battery charge current (see Block
Diagram) is:
IBAT = (IPROG)(800/RSENSE)
= (2.47V/RPROG)(800/RSENSE) or
RPROG = (2.47V/IBAT)(800/RSENSE)
where RPROG is the total resistance from the PROG pin to
ground.
For example, if 0.5A charge current is needed, select a
value for RSENSE that will drop 100mV at the maximum
charge current. RSENSE = 0.1V/0.5A = 0.2, then calculate:
RPROG = (2.47V/500mA)(800/0.2) = 19.76k
For best stability over temperature and time, 1% resistors
are recommended. The closest 1% resistor value is 19.6k.
Programming the Timer
The programmable timer terminates the charge cycle.
Typically when charging at a 1C rate, a discharged Li-Ion
battery will become fully charged in 3 hours. For lower
charge current rates, extend the time accordingly. The
length of the timer is programmed by an external capaci-
tor at the TIMER pin. The total charge time is:
Time (Hours) = (3 Hours) (CTIMER/0.1F) or
CTIMER = 0.1F Time (Hours)/3 Hours
The timer starts when an input voltage greater than 4V is
applied and the program resistor is connected to ground.
After a time-out occurs, the CHRG output will go high
impedance to indicate that charging has stopped. To dis-
able the timer function, short the TIMER pin to GND.
2k
400k
CHRG
4050 F01
VCC
LTC4050
V +
OUT
PROCESSOR
IN
3
8
VDD
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4052 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:150mA Standalone Linear Li-Ion Battery Charger in ThinSOT |
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| LTC4052EMS8E-4.2 | 功能描述:IC CHARGER PULSE LI-ION 8-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:61 系列:- 功能:電源管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC4052EMS8E-4.2#PBF | 功能描述:IC CHARGER PULSE LI-ION 8-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標準包裝:4,000 系列:- 功能:燃料，電量檢測計/監(jiān)控器 電池化學:鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
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