參數(shù)資料
型號(hào)： LTC4007EUFD-1#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 4A, High Efficiency, Standalone Li-Ion Battery Charger; Package: QFN; No of Pins: 24; Temperature Range: -40°C to +125°C
中文描述： BATTERY CHARGE CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PQCC24
封裝： 4 X 5 MM, LEAD FREE, PLASTIC, QFN-24
文件頁(yè)數(shù)： 7/24頁(yè)
文件大?。?/td> 269K
代理商： LTC4007EUFD-1#PBF
15
LTC4007-1
40071f
the full-scale voltage is reduced then, R4 = R5 = 2.49k and
RPROG = 26.7k, the maximum charging current is still 2.5A
but the FLAG trip point is maintained at 10% of full scale.
There are other effects to consider. The voltage across the
current comparator is scaled to obtain the same values as
the 100mV sense voltage target, but the input referred
sense voltage is reduced, causing some careful consider-
ation of the ripple current. Input referred maximum com-
parator threshold is 117mV, which is the same ratio of 1.4x
the DC target. Input referred IREV threshold is scaled back
to –24mV. The current at which the switcher starts will be
reduced as well so there is some risk of boost activity.
These concerns can be addressed by using a slightly larger
inductor to compensate for the reduction of tolerance to
ripple current.
Charger Voltage Programming
Pins CHEM and C3C4 are used to program the charger final
output voltage. The CHEM pin programs Li-Ion battery
chemistry for 4.1V/cell (low) or 4.2V/cell (high). The C3C4
pin selects either 3 series cells (low) or 4 series cells
(high). It is recommended that these pins be shorted to
ground (logic low) or left open (logic high) to effect the
desired logic level. Use open-collector or open-drain out-
puts when interfacing to the CHEM and 3C4C pins from a
logic control circuit.
Table 3. Charger Voltage Programming
VFINAL (V)
3C4C
CHEM
12.3
LOW
12.6
LOW
HIGH
16.4
HIGH
LOW
16.8
HIGH
Setting the Timer Resistor
The charger termination timer is designed for a range of
1hour to 3 hour with a
±15% uncertainty. The timer is
programmed by the resistor RRT using the following
equation:
tTIMER = 10 227 RRT 17.5pF (seconds)
APPLICATIO S I FOR ATIO
WU
UU
It is important to keep the parasitic capacitance on the RT
pin to a minimum. The trace connecting RT to RRT should
be as short as possible.
Soft-Start
The LTC4007-1 is soft started by the 0.12
F capacitor on
the ITH pin. On start-up, ITH pin voltage will rise quickly to
0.5V, then ramp up at a rate set by the internal 40
A pull-
up current and the external capacitor. Battery charging
current starts ramping up when ITH voltage reaches 0.8V
and full current is achieved with ITH at 2V. With a 0.12
F
capacitor, time to reach full charge current is about 2ms
and it is assumed that input voltage to the charger will
reach full value in less than 2ms. The capacitor can be
increased up to 1
F if longer input start-up times are
needed.
Input and Output Capacitors
The input capacitor (C2) is assumed to absorb all input
switching ripple current in the converter, so it must have
adequate ripple current rating. Worst-case RMS ripple
current will be equal to one half of output charging current.
Actual capacitance value is not critical. Solid tantalum low
ESR capacitors have high ripple current rating in a rela-
tively small surface mount package,
but caution must be
Figure 7. tTIMER vs RRT
RRT (k)
100
0
t TIMER
(MINUTES)
50
150
200
250
500
350
300
40071 F07
100
400
450
300
1300
500
700
900
1100
相關(guān)PDF資料
PDF描述
LTC4007EUFD-1#TRPBF 4A, High Efficiency, Standalone Li-Ion Battery Charger; Package: QFN; No of Pins: 24; Temperature Range: -40°C to +125°C
LTC4008EGN#PBF 4A, High Efficiency, Multi-Chemistry Battery Charger; Package: SSOP; No of Pins: 20; Temperature Range: -40°C to +125°C
LTC4008EGN#TRPBF 4A, High Efficiency, Multi-Chemistry Battery Charger; Package: SSOP; No of Pins: 20; Temperature Range: -40°C to +125°C
LTC4008EGN-1#PBF 4A, High Efficiency, Multi-Chemistry Battery Charger; Package: SSOP; No of Pins: 20; Temperature Range: -40°C to +125°C
LTC4008EGN-1#TRPBF 4A, High Efficiency, Multi-Chemistry Battery Charger; Package: SSOP; No of Pins: 20; Temperature Range: -40°C to +125°C
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4008 制造商:LINER 制造商全稱:Linear Technology 功能描述:4A, High Efficiency, Standalone Li Battery Charger
LTC4008EGN 功能描述:IC BATT CHARGER CTRLR 4A 20SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):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(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
LTC4008EGN#PBF 功能描述:IC BATT CHARGER CTRLR 4A 20SSOP 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(biāo)準(zhǔn)包裝:4,000 系列:- 功能:燃料，電量檢測(cè)計(jì)/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
LTC4008EGN#TR 功能描述:IC CTRLR CHARGR PWM CC/CV 20SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):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(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
LTC4008EGN#TRPBF 功能描述:IC BATT CHARGER CTRLR 4A 20SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):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(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
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