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參數(shù)資料
| 型號(hào)： | LT3652HVEMSE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, PDSO12 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-12 |
| 文件頁數(shù)： | 5/24頁 |
| 文件大?。?/td> | 250K |
| 代理商： | LT3652HVEMSE#TRPBF |
LT3652HV
13
3652hvf
APPLICATIONS INFORMATION
In low VIN applications, the BOOST supply can be powered
by an external source for start-up, eliminating the VIN
start-up requirement.
VBAT Output Decoupling
An LT3652HV charger output requires bypass capacitance
connected from the BAT pin to ground (CBAT). A 10μF
ceramic capacitor is required for all applications. In systems
where the battery can be disconnected from the charger
output, additional bypass capacitance may be desired for
visual indication for a no-battery condition (see the Status
Pins section).
If it is desired to operate a system load from the LT3652HV
charger output when the battery is disconnected, additional
bypass capacitance is required. In this type of application,
excessive ripple and/or low amplitude oscillations can oc-
cur without additional output bulk capacitance. For these
applications, place a 100μF low ESR non-ceramic capacitor
(chip tantalum or organic semiconductor capacitors such
as Sanyo OS-CONs or POSCAPs) from BAT to ground,
in parallel with the 10μF ceramic bypass capacitor. This
additional bypass capacitance may also be required in
systems where the battery is connected to the charger
with long wires. The voltage rating of CBAT must meet or
exceed the battery float voltage.
Inductor Selection
The primary criterion for inductor value selection in an
LT3652HV charger is the ripple current created in that
inductor. Once the inductance value is determined, an
inductor must also have a saturation current equal to or
exceeding the maximum peak current in the inductor. An
inductor value (L), given the desired amount of ripple cur-
rent (ΔIMAX) can be approximated using the relation:
L = (10 RSENSE / ΔIMAX) VBAT(FLT)
[1 – (VBAT(FLT) / VIN(MAX))]
(μH)
In the above relation, ΔIMAX is the normalized ripple cur-
rent, VIN(MAX) is the maximum operational voltage, and
VF is the forward voltage of the rectifying Schottky diode.
Ripple current is typically set within a range of 25% to
35% of ICHG(MAX), so an inductor value can be determined
by setting 0.25 < ΔIMAX < 0.35.
Figure 3. 14.4V at 1.5A Switched Inductor Values
MAXIMUM OPERATIONAL VIN VOLTAGE (V)
18
20
22
4
SWITCHED
INDUCTOR
V
ALUE
(μH)
12
10
14
24
16
18
20
22
34
3652 F03
8
6
26
28
24
30
32
Magnetics vendors typically specify inductors with
maximum RMS and saturation current ratings. Select an
inductor that has a saturation current rating at or above (1+
ΔIMAX/2) ICHG(MAX), and an RMS rating above ICHG(MAX).
Inductors must also meet a maximum volt-second product
requirement. If this specification is not in the data sheet of
an inductor, consult the vendor to make sure the maximum
volt-second product is not being exceeded by your design.
The minimum required volt-second product is:
VBAT(FLT) (1 – VBAT(FLT)/VIN(MAX)) (V μS)
Rectifier Selection
The rectifier diode from SW to GND, in a LT3652HV battery
charger provides a current path for the inductor current
when the main power switch is disabled. The rectifier is
selected based upon forward voltage, reverse voltage, and
maximum current. A Schottky diode is required, as low
forward voltage yields the lowest power loss and highest
efficiency. The rectifier diode must be rated to withstand
reverse voltages greater than the maximum VIN voltage.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3652HVIDD#PBF | 功能描述:IC BATTERY CHARGER 2A 12-DFN 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) |
| LT3652HVIDD#TRPBF | 功能描述:IC BATTERY CHARGER 2A 12-DFN 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) |
| LT3652HVIDD-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Power Tracking 2A Battery Charger |
| LT3652HVIDD-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Power Tracking 2A Battery Charger |
| LT3652HVIMSE#PBF | 功能描述:IC BATTERY CHARGER 2A 12-MSOP 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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