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參數(shù)資料
| 型號(hào)： | LTC4155IUFD#TRPBF |
| 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)： | 16/52頁 |
| 文件大?。?/td> | 473K |
| 代理商： | LTC4155IUFD#TRPBF |
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LTC4155
23
4155f
2.5mA Linear Suspend Mode
The LTC4155 can supply a small amount of current from
VBUS to VOUT to power the system and reduce battery
discharge when the product has access to a suspended
USB port. When the system load current is less than the
current available from the suspended USB port, the volt-
age at VOUT will be regulated to 4.35V. If the system load
current exceeds USB input current limit, the voltage at
VOUT will fall to the battery voltage and any supplemental
current above that available from the USB port will be
supplied by the battery. CLPROG2 will servo to 103mV
in current limit. Battery charging is disabled in suspend
mode.EithertheUSBorWALLinputmayutilizethiscurrent
limited suspend mode by programming the appropriate
setting in the respective USBILIM or WALLILIM register.
Ideal Diode and Minimum VOUT Controller
The LTC4155 features an ideal diode controller to ensure
that the system is provided with sufficient power even
when input power is absent or insufficient. This requires
an external PMOS transistor with its source connected
to CHGSNS, gate to BATGATE, and drain to BATSNS. The
controller modulates the gate voltage of the PMOS tran-
sistor to allow current to flow from the battery to VOUT to
power the system while blocking current in the opposite
direction to prevent overcharging of the battery.
The ideal diode controller has several modes of operation.
When input power is available and the battery is charging,
the PMOS gate will generally be grounded to maximize
conductionbetweentheswitchingregulatorandthebattery
formaximumefficiency.Ifthebatteryisdeeplydischarged,
the LTC4155 will automatically increase the impedance
between the switching regulator and the battery enough
to prevent VOUT from falling below approximately 3.5V.
Power to the system load is always prioritized over battery
charge current. Increasing the impedance between VOUT
and the battery does not necessarily affect the battery
charge current, but it may do so for one of the following
two reasons:
1. The charge current will be limited to prevent excessive
power dissipation in the external PMOS as it becomes
more resistive. Charge current reduction begins when
the voltage across the PMOS reaches approximately
250mV, and can reduce the charge current as low as
8%fullscale.MaximumpowerdissipationinthePMOS
is limited to approximately 1W with RPROG = 499Ω.
2. Whenlimitedpowerisavailabletotheswitchingregula-
tor because either the programmed input current limit
or input undervoltage current limit is active, charge
current will automatically be reduced to prioritize
power delivery to the system at VOUT. VOUT will be
maintained at 3.5V as long as possible without exceed-
ing the input power limitation. If the system load alone
requires more power than is available from the input
after charge current has been reduced to zero, VOUT
must fall to the battery voltage as the battery begins
providing supplemental power.
When input power is available, but the battery charger is
disabled or charging has terminated, VOUT and the bat-
tery are normally disconnected to prevent overcharging
the battery. If the power required by the system should
exceed the power available from the input, either because
of input current limit or input undervoltage current limit,
VOUT will fall to the battery voltage and any additional cur-
rent required by the load will be supplied by the battery
through the ideal diode.
When input power is unavailable, the ideal diode switches
to a low power mode which maximizes conduction and
power transmission efficiency between VOUT and the bat-
tery by grounding the PMOS gate.
Finally, when ship-and-store mode is activated, the ideal
diode is shut down and BATGATE is driven to the battery
voltage to prevent conduction through the PMOS. Note
that with a single FET, conduction to VOUT is still possible
through the body connection diode. Refer to Low Power
Ship-and-Store Mode in the Operation section for more
information about this mode.
OPERATION
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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(biāo)準(zhǔn)包裝:4,000 系列:- 功能:燃料，電量檢測計(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(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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