參數(shù)資料
型號(hào)： LTC4007EUFD-1#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 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)： 24/24頁(yè)
文件大?。?/td> 269K
代理商： LTC4007EUFD-1#PBF
9
LTC4007-1
40071f
TEST CIRCUIT
–
+
–
+
EA
LT1055
LTC4007-1
VREF
CHEM
3C4C
BAT
DIVIDER/
MUX
13
5
12
CSP
11
ITH
0.6V
40071 TC
8
OPERATIO
U
Overview
The LTC4007-1 is a synchronous current mode PWM
step-down (buck) switcher battery charger controller. The
charge current is programmed by the combination of a
program resistor (RPROG) from the PROG pin to ground
and a sense resistor (RSENSE) between the CSP and BAT
pins. The final float voltage is programmed to one of four
values (12.3V, 12.6V, 16.4V, 16.8V) with
±1% maximum
accuracy using pins 3C4C and CHEM. Charging begins
when the potential at the DCIN pin rises above the voltage
at BAT (and the UVLO voltage) and the SHDN pin is low; the
CHG pin is set low. At the beginning of the charge cycle, if
the cell voltage is below 3.25V (3.173V if CHEM is low), the
LOBAT pin will be low. The LOBAT indicator can be used
to reduce the charging current to a low value, typically
10% of full scale. If the cell voltage stays below 3.25V for
25% of the total charge time, the charge sequence will be
terminated immediately and the FAULT pin will be set low.
An external thermistor network is sampled at regular
intervals. If the thermistor value exceeds design limits,
charging is suspended and the FAULT pin is set low. If the
thermistor value returns to an acceptable value, charging
resumes and the FAULT pin is set high. An external resistor
on the RT pin sets the total charge time. The timer can be
defeated by forcing the CHG pin to a low voltage.
As the battery approaches the final float voltage, the
charge current will begin to decrease. When the current
drops to 10% of the full-scale charge current, an internal
C/10 comparator will indicate this condition by latching
the FLAG pin low. The charge timer is also reset to 1/4 of
the total charge time when FLAG goes low. If this condition
is caused by an input current limit condition, described
below, then the FLAG indicator will be inhibited. When a
time-out occurs, charging is terminated immediately and
the CHG pin is forced to a high impedance state. To restart
the charge cycle manually, simply remove the input volt-
age and reapply it, or set the SHDN pin high momentarily.
When the input voltage is not present, the charger goes
into a sleep mode, dropping battery current drain to 15
A.
This greatly reduces the current drain on the battery and
increases the standby time. The charger is inhibited any
time the SHDN pin is high.
Input FET
The input FET circuit performs two functions. It enables
the charger if the input voltage is higher than the CLN pin
and provides the logic indicator of AC present on the ACP
pin. It controls the gate of the input FET to keep a low
forward voltage drop when charging and also prevents
reverse current flow through the input FET.
If the input voltage is less than VCLN, it must go at least
170mV higher than VCLN to activate the charger. When this
occurs the ACP pin is released and pulled up with an
external load to indicate that the adapter is present. The
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(chēng):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(lèi)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(lèi)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(lèi)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(lèi)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(chēng):497-10526-2
LTC4008EGN#TR 功能描述:IC CTRLR CHARGR PWM CC/CV 20SSOP RoHS:否 類(lèi)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(lèi)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(lèi)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(lèi)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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