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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)： | 6/20頁 |
| 文件大?。?/td> | 227K |
| 代理商： | LTC4001-1EUF#TRPBF |
14
LTC4001-1
40011f
Inductor Selection
A high (1.5MHz) operating frequency was chosen for the
buck switcher in order to minimize the size of the inductor.
However, take care to use inductors with low core losses
at this frequency. A good choice is the IHLP-2525AH-01
from Vishay Dale.
To calculate the inductor ripple current:
=
I
V
Lf
L
BAT
IN
–
2
where VBAT is the battery voltage, VIN is the input voltage,
L is the inductance and f is the PWM oscillator frequency
(typically 1.5MHz). Maximum inductor ripple current oc-
curs at maximum VIN and VBAT = VIN/2.
Peak inductor current will be:
IPK = IBAT + 0.5 IL
where IBAT is the maximum battery charging current.
When sizing the inductor make sure that the peak current
will not exceed the saturation current of the inductors.
Also,
IL should never exceed 0.4(IBAT) as this may
interfere with proper operation of the output short-circuit
protection comparator. 1.5
H provides reasonable induc-
tor ripple current in a typical application. With 1.5
H and
2A charge current:
=
=
I
V
HMHz
A
LP
285
55
15
061
2
.–
.
. .
.
-P
and
IPK = 2.31A
APPLICATIO S I FOR ATIO
WU
UU
Remote Sensing
For highest float voltage accuracy, tie GNDSENS and
BATSENS directly to the battery terminals. In a similar
fashion, tie BAT and PGND directly to the battery termi-
nals. This eliminates IR drops in the GNDSENS and
BATSENS lines by preventing charge current from flowing
in them.
Operation with a Current Limited Wall Adapter
Wall adapters with or without current limiting may be used
with the LTC4001-1, however, lowest power dissipation
battery charging occurs with a current limited wall adapter.
To use this feature, the wall adapter must limit at a current
smaller than the high rate charge current programmed
into the LTC4001-1. For example, if the LTC4001-1 is
programmed to charge at 2A, the wall adapter current limit
must be less than 2A.
To understand operation with a current limited wall adapter,
assume battery voltage, VBAT, is initially below VTRIKL, the
trickle charge threshold (Figure 5). Battery charging be-
gins at approximately 50mA, well below the wall adapter
current limit so the voltage into the LTC4001-1 (VIN) is the
wall adapter’s rated output voltage (VADAPTER). Battery
voltage rises eventually reaching VTRIKL. The linear charger
shuts off, the PWM (high rate) charger turns on and a soft-
start cycle begins. Battery charging current rises during
the soft-start cycle causing a corresponding increase in
wall adapter load current. When the wall adapter reaches
current limit, the wall adapter output voltage collapses and
the LTC4001-1 PWM charger duty cycle ramps up to
100% (the topside PMOS switch in the LTC4001-1 buck
regulator stays on continuously). As the battery voltage
approaches VFLOAT, the float voltage error amplifier com-
mands the PWM charger to deliver less than ILIMIT. The
wall adapter exits current limit and the VIN jumps back up
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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(xué):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(yīng)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(xué):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(yīng)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(xué):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(yīng)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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