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)： 11/52頁
文件大?。?/td> 473K
代理商： LTC4155EUFD#PBF
LTC4155
19
4155f
Battery Float Voltage Regulation
When the battery charger is enabled, the switching regula-
tor will reduce its output power to prevent VBATSNS from
exceeding the programmed battery float voltage, VFLOAT.
The float voltage may be selected from among four pos-
sible choices via the I2C interface using bits VFLOAT[1:0].
Refer to Table 12.
Battery Charge Current Regulation and Low Cell Trickle
Charge
The switching regulator will also reduce its output power
to limit battery charge current, ICHARGE, to a programmed
maximumvalue.Thebatterychargecurrentisprogrammed
using both a resistor, RPROG, between PROG and ground
to set default maximum charge current plus I2C adjust-
ability to optionally reduce programmed charge current.
The battery charge current loop mirrors a precise fraction
of the battery charge current, IBAT, to the PROG pin, then
reduces switching regulator output power to limit the
resultant voltage, VPROG, to one of fifteen possible servo
reference voltages.
The following expression may be used to determine the
battery charge current at any time by sampling the PROG
pin voltage.
IBAT =
VPROG
RPROG
1000
This expression may also be used to calculate the required
value of RPROG for any desired charge current. The resis-
tor value required to program default maximum charge
current may be found by substituting VPROG = 1.200 and
solving for RPROG. The other fourteen settings are I2C
selectable using ICHARGE[3:0] and reduce the charge
current in 6.25% steps. The resulting limits may be found
by substituting RPROG and the relevant VPROG servo volt-
age from Table11.
The maximum charge current should be set based on the
cell size and maximum charge rate without regard to input
current setting or input power source.
The LTC4155 monitors the voltage across the external
PMOS transistor and automatically reduces the cur-
rent regulation servo voltage at VPROG to limit power
dissipation in the transistor. During normal operation, the
PMOS channel is fully enhanced and power dissipation is
typically under 100mW. Starting when the battery voltage
is below approximately 3.25V, the charge current servo
voltage will be gradually reduced from its I2C programmed
valuetoaminimumvaluebetween75mVand100mVwhen
the battery is below VLOWBAT, typically 2.8V. This charge
currentreductionhasthecombinedeffectofprotectingthe
external PMOS transistor from damage due to excessive
heat, while also trickle charging the excessively depleted
cell to maximize battery health and lifetime. Peak power
dissipation in the external PMOS transistor is limited to
approximately1W.Figure1showstherelationshipbetween
battery voltage, charge current and power dissipation.
OPERATION
Figure 1. VOUT Minimum Voltage Regulation
VOUT Voltage Regulation
A third control loop reduces power delivery by the switch-
ing regulator in response to the voltage at VOUT, which
has a nonprogrammable servo voltage of 4.35V. When the
battery charger is enabled, VOUT is connected to BATSNS
through the internal charge current sense resistor and the
externalPMOSbatteryFET.Thetwonodevoltageswilldiffer
only by the I R drop through the two devices, effectively
keeping VOUT below its servo point for the duration of the
charge cycle.
The LTC4155 will attempt to prevent VOUT from falling
below approximately 3.5V when the battery is deeply
BATTERY VOLTAGE (V)
2.4
0
BATTERY
CHARGE
CURRENT
(A)
PFET
DISSIPATION
(W)
0.5
1.0
1.5
2.0
2.5
0
0.2
0.4
0.6
0.8
1.0
2.7
3.0
3.3
3.6
4155 F01
3.9
4.2
ICHARGE 2.4A MODE (100%)
PDISS 2.4A MODE (100%)
ICHARGE 1.2A MODE (50%)
PDISS 1.2A MODE (50%)
相關PDF資料
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相關代理商/技術參數(shù)
參數(shù)描述
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 供應商設備封裝: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 供應商設備封裝: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:* 其它有關文件:STC3100 View All Specifications 特色產品: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） 供應商設備封裝: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 供應商設備封裝: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:* 其它有關文件:STC3100 View All Specifications 特色產品: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） 供應商設備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2
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