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參數(shù)資料
| 型號(hào)： | LT3653EDCB#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.2 A BATTERY CHARGE CONTROLLER, 1650 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 2 X 3 MM, LEAD FREE, PLASTIC, DFN-8 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 155K |
| 代理商： | LT3653EDCB#TRPBF |
LT3653
7
3653f
OPERATION
Please refer to the Block Diagram. The LT3653 is speci-
cally tailored for use with a battery charger power path
controller. The LT3653 regulates the high voltage input to
a lower voltage to provide power to the system load and to
the single-cell Li-Ion battery charger. High efciency in the
battery charger is achieved by keeping the voltage across
it low. To accomplish this, the battery charger takes control
of the LT3653 regulator control node, VC, and overrides
the error amp, G1. The output voltage is regulated by the
battery charger to a voltage slightly above the battery,
typically 300mV.
HVOK is a status pin which indicates to the charger that a
high voltage input is present and that the LT3653 is ready to
start providing power to the system load. When the HVOK
pin is low, the LT3653 is not switching and the system
output is not supported by the LT3653 regulator.
The LT3653 is a constant frequency, current mode step
down regulator. A switch cycle is initiated when the
1.5MHz oscillator enables the RS ip op, turning on
the internal power switch, Q1. The sense amplier (A1)
monitors the switch current via the voltage dropped
across the current sense resistor RSENSE1. The compara-
tor compares the amplied current signal with the output
(VC) of the error amplier (G1). The switch is turned off
when this current exceeds a value determined by the
VC voltage. The error amplier monitors the VOUT volt-
age through an internal resistor divider and, when not
driven externally servos the VC voltage to regulate VOUT.
If the VOUT voltage drops, the VC voltage will be driven
higher increasing the output current and VOUT voltage.
An active clamp (not shown) on the VC node provides
current limit. The LT3653 is internally compensated with
a pole zero combination.
An external capacitor and internal diode, D2, are used to
generate a voltage at the BOOST pin that is higher than
the input supply. This allows the driver to fully saturate the
internal bipolar NPN power switch for efcient operation.
The switch driver operates from either VIN or BOOST to
ensure startup.
An internal regulator provides power to the control circuitry.
This regulator includes input undervoltage and overvoltage
protection which disables switching action when VIN is less
than 7V and greater than 33V, typical. When switching is
disabled, the LT3653 safely sustains input voltages up to
60V. Note that while switching is disabled the output will
discharge.
Output current limiting is provided via the servo action
of amplier G2. The voltage across the sense resistor,
RSENSE2, is compared to a voltage programmed by ex-
ternal resistor R1 on the ILIM pin. A capacitor averages
the inductor ripple current. If the averaged inductor cur-
rent exceeds the programmed value then the VC voltage
is pulled low, reducing the current in the regulator. The
output current limit circuit allows for lower current rated
power path components and provides better control of
system power dissipation.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3653IDCB#TRMPBF | 功能描述:IC REG BUCK ADJ 1.2A 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類型:升壓（升壓） 輸出類型:兩者兼有 輸出數(shù):1 輸出電壓:5V，2 V ~ 16.5 V 輸入電壓:2 V ~ 16.5 V PWM 型:- 頻率 - 開關(guān):45kHz 電流 - 輸出:50mA 同步整流器:無 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:8-PDIP |
| LT3653IDCB#TRPBF | 功能描述:IC REG BUCK ADJ 1.2A 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT3653IDCB-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.2A, HV Input Regulator with Output Current Limit for Battery Charger Applications |
| LT3653IDCB-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.2A, HV Input Regulator with Output Current Limit for Battery Charger Applications |
| LT3663EDCB#TRMPBF | 功能描述:IC REG BUCK ADJ 1.2A 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
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