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參數(shù)資料
| 型號： | LTC4001-1EUF#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封裝： | 4 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-220WGGC, QFN-16 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大小： | 227K |
| 代理商： | LTC4001-1EUF#TRPBF |
16
LTC4001-1
40011f
APPLICATIO S I FOR ATIO
WU
UU
Insert the highest power dissipation figure into the follow-
ing equation to determine maximum junction temperature:
TJ = TA + (PD 37°C/W)
The LTC4001-1 includes chip overtemperature protec-
tion. If junction temperature exceeds 160
°C (typical), the
chip will stop battery charging until chip temperature
drops below 150
°C.
Using the LTC4001-1 in Applications Without a Battery
The LTC4001-1 is normally used in end products that only
operate with the battery attached (Figure 6). Under these
conditions the battery is available to supply load transient
currents. For indefinite operation with a powered wall
adapter there are only two requirements—that the aver-
age current drawn by the load is less than the high rate
charge current, and that VBAT stays above the trickle
charge threshold when the load is initially turned on and
during other load transients. When making this determi-
nation take into account battery impedance. If battery
voltage is less than the trickle charge threshold, the
system load may be turned off until VBAT is high enough
to meet these conditions.
The situation changes dramatically with the battery re-
moved (Figure 7). Since the battery is absent, VBAT begins
at zero when a powered wall adapter is first connected to
the battery charger.
With a maximum load less than the
LTC4001-1 trickle charge current, battery voltage will
ramp up until VBAT crosses the trickle charge threshold.
When this occurs, the LTC4001-1 switches over from
trickle charge to high rate (PWM) charge mode but initially
delivers zero current (because the soft-start pin is at zero).
Battery voltage drops as a result of the system load,
crossing below the trickle charge threshold. The charger
re-enters trickle charge mode and the battery voltage
ramps up again until the battery charger re-enters high
rate mode.
The soft-start voltage is slightly higher this time around
(than in the previous PWM cycle). Every successive time
that the charger enters high rate (PWM) charge mode, the
soft-start pin is at a slightly higher voltage. Eventually high
rate charge mode begins with a soft-start voltage that
causes the PWM charger to provide more current than the
system load demands, and VBAT rapidly rises until the float
voltage is reached.
For battery-less operation, system load current should be
restricted to less than the worst case trickle charge current
(preferably less than 30mA) when VBAT is less than 3.15V
(through an undervoltage lockout or other means). Above
VBAT = 3.15V, system load current less than or equal to the
high rate charge current is allowed. If operation without a
battery is required, additional low-ESR output filtering
improves start-up and other load transients. Battery-less
start-up is also improved if a 10k resistor is placed in
series with the soft-start capacitor.
Figure 6. Typical Application
+
WALL
ADAPTER
LTC4001-1
BATTERY
CHARGER
SYSTEM
LOAD
Li-Ion
BATTERY
40011 F06
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4001EUF | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion/Li-Pol 2000mA 4.2V 16-Pin QFN EP |
| LTC4001EUF#PBF | 功能描述:IC CHARGER LI-ION BUCK 16-QFN 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 |
| LTC4001EUF#TRPBF | 功能描述:IC CHARGER LI-ION BUCK 16-QFN RoHS:是 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 |
| LTC4001EUF-1#PBF | 功能描述:IC CHARGER LI-ION BUCK 16-QFN RoHS:是 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 |
| LTC4001EUF-1#PBF | 制造商:Linear Technology 功能描述:IC BATT CHARGER SW MODE 16QFN |
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