- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377777 > LTC4010EFE (Linear Integrated Systems) High Efficiency Standalone Nickel Battery Charger PDF資料下載
參數(shù)資料
| 型號： | LTC4010EFE |
| 廠商： | Linear Integrated Systems |
| 英文描述： | High Efficiency Standalone Nickel Battery Charger |
| 中文描述： | 高效率的獨立鎳電池充電器 |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 205K |
| 代理商： | LTC4010EFE |
11
LTC4010
4010p
current threshold for CC such that the desired average
current through R
SENSE
is maintained. The current com-
parator output does this by switching the state of the SR
latch at the appropriate time.
At
the beginning of each oscillator cycle, the PWM clock
sets the SR latch and the external P
-channel
MOSFET is
switched on (N
-channel
MOSFET switched off) to refresh
the current carried by the external inductor. The inductor
current and voltage drop across R
SENSE
begin to rise
linearly. During normal operation, the PFET is turned off
(NFET on) during the cycle by CC when the voltage
difference across R
SENSE
reaches the peak value set by
the output of EA. The inductor current then ramps down
linearly until the next rising PWM clock edge. This closes
the loop and maintains the desired average charge current
in the external inductor.
Low Dropout Charging
After charging is initiated, the LTC4010 does not require
that V
CC
remain at least 500mV above BAT because
situations exist where low dropout charging might occur.
OPERATIOU
In one instance, parasitic series resistance may limit PWM
headroom (between V
CC
and BAT) as 100% charge is
reached. A second case can arise when the DC adapter
selected by the end user is not capable of delivering the
current programmed by R
SENSE
, causing the output volt-
age of the adapter to collapse. While in low dropout, the
LTC4010 PWM runs near 100% duty cycle with a fre-
quency that may not be constant and can be less than
550kHz. The charge current will drop below the pro-
grammed value to avoid generating audible noise, so the
actual charge delivered to the battery may depend prima-
rily on the LTC4010 charge timer.
Internal Die Temperature
The LTC4010 provides internal overtemperature detec-
tion to protect against electrical overstress, primarily at
the FET driver outputs. If the die temperature rises above
this thermal limit, the LTC4010 stops switching and
indicates a fault as previously discussed.
APPLICATIU
External DC Source
The external DC power source should be connected to the
charging system and the V
CC
pin through a power diode
acting as an input rectifier. This prevents catastrophic
system damage in the event of reverse-voltage polarity at
the DC input. The LTC4010 automatically senses when
this input drives the V
CC
pin above BAT. The open-circuit
voltage of the DC source should be between 5.5V and 34V,
depending on the number of cells being charged. In order
to avoid low dropout operation, ensure 100% capacity at
charge termination, and allow reliable detection of battery
insertion, removal or overvoltage, the following equation
can be used to determine the minimum full-load voltage
that should be produced at V
CC
when the external DC
power source is connected.
V
CC(MIN)
= (n 2V) + 0.3V
where n is the number of series cells in the battery pack.
W
U
U
The LTC4010 will properly charge over a wide range of V
CC
and BAT voltage combinations. Operating the LTC4010 in
low dropout or with V
CC
much greater than BAT will force
the PWM frequency to be much less than 550kHz. The
LTC4010 disables charging and sets a fault if a large V
CC
to BAT differential would cause generation of audible noise.
Load Control
Proper current load control is an important consideration
when fast charging nickel cells. This control ensures that
the system load remains powered at all times, but that
normal system operation and associated load transients
do not adversely affect fast charge termination. The input
protecton detailed in the previous paragraph is an integral
part of the necessary load control.
The battery should also be connected to the raw system
supply by some rectifying means, thus forming a switch that
相關PDF資料 |
PDF描述 |
|---|---|
| LTC4052-42 | Lithium-Ion Battery Pulse Charger with Overcurrent Protection |
| LTC4052EMS8E-4.2 | Lithium-Ion Battery Pulse Charger with Overcurrent Protection |
| LTC4056 | 150mA Standalone Linear Li-Ion Battery Charger in ThinSOT |
| LTC1732-4.2 | Lithium-Ion Linear Battery Charger Controller |
| LTC1731EMS8-4.1 | Lithium-Ion Linear Battery Charger Controller |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4011 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Standalone Nickel Battery Charger |
| LTC4011_1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Standalone Nickel Battery Charger |
| LTC4011CFE | 功能描述:IC BATT CHARGER HIEFF 20TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學:堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-6 包裝:帶卷 (TR) |
| LTC4011CFE#PBF | 功能描述:IC BATT CHARGER HIEFF 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關文件: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） 供應商設備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
| LTC4011CFE#TR | 功能描述:IC BATT CHARGER HIEFF 20TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學:堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-6 包裝:帶卷 (TR) |
發(fā)布緊急采購，3分鐘左右您將得到回復。