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參數(shù)資料
| 型號： | LTC4155IUFD#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)： | 5/52頁 |
| 文件大?。?/td> | 473K |
| 代理商： | LTC4155IUFD#PBF |
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LTC4155
13
4155f
PIN FUNCTIONS
USBGT to energize the external transistors. If the input
voltage exceeds VOVLO, USBGT will be pulled to GND to
disable the pass transistors and protect the LTC4155 from
high voltage.
Power detected on WALLSNS is prioritized over USBSNS.
If power is detected on both WALLSNS and USBSNS, by
default, only WALLGT will receive drive for its pass tran-
sistors. See the Operations section for further information
about programmable priority.
USBGT (Pin 9): Overvoltage Protection and Priority Mul-
tiplexer Gate Output. Connect USBGT to the gate pins of
two source-connected external N-channel MOSFET pass
transistors. One drain of the transistors should be con-
nected to VBUS and the other drain should be connected
to a low priority DC input connector. In the absence of an
overvoltage condition, this pin is driven from an internal
chargepumpcapableofcreatingsufficientoverdrivetofully
enhance the pass transistors. If an overvoltage condition
is detected, USBGT is brought rapidly to GND to prevent
damage to the LTC4155. USBGT works in conjunction with
USBSNS to provide this protection. USBGT also works in
conjunction with WALLSNS to determine power source
prioritization. See the Operation section.
OVGCAP (Pin 10): Overvoltage Protection Capacitor
Output. A 0.1F capacitor should be connected from
OVGCAP to GND. OVGCAP is used to store charge so
that it can be rapidly moved to WALLGT or USBGT. This
feature provides faster power switchover when multiple
inputs are supported by the end product.
WALLGT (Pin 9): Overvoltage Protection and Priority Mul-
tiplexer Gate Output. Connect WALLGT to the gate pins of
two source-connected external N-channel MOSFET pass
transistors. One drain of the transistors should be con-
nected to VBUS and the other drain should be connected
to a high priority input connector. In the absence of an
overvoltage condition, this pin is driven from an internal
chargepumpcapableofcreatingsufficientgatedrivetofully
enhance the pass transistors. If an overvoltage condition
is detected, WALLGT is brought rapidly to GND to prevent
damage to the LTC4155. WALLGT works in conjunction
with WALLSNS to provide this protection. WALLGT also
works in conjunction with USBSNS to determine power
source prioritization. See the Operation section.
VC (Pin 12): Compensation Pin. A 0.047μF ceramic ca-
pacitor on this pin compensates the switching regulator
control loops.
VOUTSNS(Pin13):OutputVoltageSenseInput.Connecting
VOUTSNSdirectlytotheVOUTbypasscapacitorensuresthat
VOUT regulates at the correct level.
NTCBIAS (Pin 14): NTC Thermistor Bias Output. Con-
nect a bias resistor between NTCBIAS and NTC, and a
thermistor between NTC and GND. The value of the bias
resistor should usually be equal to the nominal value of
the thermistor.
NTC(Pin15):InputtotheNegativeTemperatureCoefficient
Thermistor Monitoring Circuit. The NTC pin connects to
a negative temperature coefficient thermistor, which is
typically copackaged with the battery, to determine if the
battery is too warm or too cold to charge or if the battery
is dangerously hot. If the battery’s temperature is out of
range, charging is paused until the battery temperature re-
enters the valid range. A low drift bias resistor is required
from NTCBIAS to NTC and a thermistor is required from
NTC to ground. The thermistor’s temperature reading is
continually digitized by an analog to digital converter and
may be read back at any time via the I2C port.
BATSNS (Pin 16): Battery Voltage Sense Input. For proper
operation,thispinmustalwaysbeconnectedtothebattery.
For fastest charging, connect BATSNS physically close to
the Lithium-Ion cell’s positive terminal. Depending upon
available power and load, a Li-Ion battery connected to
the BATSNS pin will either be charged from VOUT or will
deliver system power to VOUT via the required external
P-channel MOSFET transistor.
BATGATE (Pin 17): Battery Charger and Ideal Diode Am-
plifier Control Output. This pin controls the gate of an
external P-channel MOSFET transistor used to charge the
Lithium-Ion cell and to provide power to VOUT when the
system load exceeds available input power. The source of
the P-channel MOSFET should be connected to CHGSNS
and the drain should be connected to BATSNS and the
battery.
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| 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 標準包裝:4,000 系列:- 功能:燃料，電量檢測計/監(jiān)控器 電池化學: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)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學: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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