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參數(shù)資料
| 型號： | LTC4155EUFD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PQCC28 |
| 封裝： | 5 X 4 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WXXX-X, QFN-28 |
| 文件頁數(shù)： | 41/52頁 |
| 文件大?。?/td> | 473K |
| 代理商： | LTC4155EUFD#PBF |
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LTC4155
46
4155f
stable behavior, but if engaged, it will result in much less
power delivery to the system load and battery, depending
on the magnitude of input resistance.
If the undervoltage current limit feature is disabled and the
input power source is resistive, the voltage will continue
to fall through the falling undervoltage lockout threshold,
eventually shutting down that input channel and resetting
its input current limit back to the default setting. When
the input voltage recovers, the channel will restart in the
default current limit setting.
Board Layout Considerations
The Exposed Pad on the backside of the LTC4155 package
must be securely soldered to the PC board ground. This
is the primary ground pin in the package, and it serves as
the return path for both the control circuitry and the syn-
chronous rectifier. Furthermore, due to its high frequency
switching circuitry, it is imperative that the input capacitor
be as close to the LTC4155 as possible, and that there
be an unbroken ground plane under the LTC4155 and its
external input bypass capacitors. Additionally, minimizing
the area between the SW pin trace and inductor will limit
high frequency radiated energy.
The output capacitor carries the inductor ripple current.
While not as critical as the input capacitor, an unbroken
ground plane from this capacitor’s ground return to the
inductor, input capacitor, and LTC4155 Exposed Pad will
reduce output voltage ripple.
High frequency currents, such as the input current on the
LTC4155, tend to find their way on the ground plane along
a mirror path directly beneath the incident path on the top
of the board. If there are slits or cuts in the ground plane
due to other traces on that layer, the current will be forced
to go around the slits. If high frequency currents are not
allowed to flow back through their natural least-area path,
excessive voltage will build up and radiated emissions will
occur (see Figure 13). There should be a group of vias
directly under the grounded backside leading directly
down to an internal ground plane. To minimize parasitic
inductance, the ground plane should be as close as pos-
sible to the top plane of the PC board (layer 2).
The BATGATE pin has limited drive current. Care must be
taken to minimize leakage to adjacent PC board traces,
which may significantly compromise the 15mV ideal di-
ode forward voltage. To minimize leakage, the trace can
be guarded on the PC board by surrounding it with VOUT
connected metal, which should generally be less than 1V
higher than BATGATE.
Figure 13. Higher Frequency Ground Currents Follow Their
Incident Path. Slices in the Ground Plane Cause High Voltage
and Increased Emissions
APPLICATIONS INFORMATION
4155 F13
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| LTC4155IUFD#TRPBF | POWER SUPPLY SUPPORT CKT, PQCC28 |
| LTC4155IUFD#PBF | POWER SUPPLY SUPPORT CKT, PQCC28 |
| LTC4215CUFD-2 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
| LTC4215IUFD-2#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
| LTC4215IUFD-2#TRPBF | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LTC4155IUFD#PBF | 功能描述:IC I2C POWER MANAGER DUAL 28QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:PowerPath™ 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) |
| LTC4155IUFD#TRPBF | 功能描述:IC I2C POWER MANAGER DUAL 28QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:PowerPath™ 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) |
| LTC4156EUFD#PBF | 功能描述:IC POWER LI-ION CHARGER 28-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(biāo)準(zhǔn)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 |
| LTC4156EUFD#TRPBF | 功能描述:IC POWER LI-ION CHARGER 28-QFN 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) |
| LTC4156IUFD#PBF | 功能描述:IC POWER LI-ION CHARGER 28-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(biāo)準(zhǔn)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 |
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