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參數(shù)資料
| 型號： | LTC4110EUHF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC38 |
| 封裝： | 5 X 7 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WHKD, QFN-38 |
| 文件頁數(shù)： | 13/52頁 |
| 文件大?。?/td> | 450K |
| 代理商： | LTC4110EUHF |
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LTC4110
20
4110fb
The CAL_START bit in the BBuControl() register is set.
The LTC4110 enters the calibration state.
The battery thermistor is registering RES_OR. The
LTC4110 enters the reset state.
LEAD ACID BATTERY CHARGE MODE
The charger is programmed for lead acid batteries by con-
necting the TYPE pin to a voltage derived from the VREF
pin resistor divider of nominally 0.5 VREF. During charge,
the LTC4110 operates as a high efciency, synchronous,
PWM yback battery charger with constant current and
constant oat voltage regions of operation. The constant-
charge current is programmed by the combination of a
resistor (RCHG) from the ICHG pin to ground, a battery
current sense resistor (RSNS) and CSP/CSN pin resistors.
The oat voltage is programmed to one of four values
(4.7V, 7.05V, 11.75V, 14.1V) depending on the number of
series cells (2, 3, 5 or 6) using the SELC pin and can be
adjusted ±0.15V/cell with the VCHG pin.
A new charge cycle begins with the charger in the bulk
charge current limited state. In this state, the charger is
a current source providing a constant charge rate and the
CHGb (GPIO1 pin) is forced low. No time limits are placed
upon lead acid battery charge. The charger monitors the
battery voltage and as it reaches the oat voltage the
charger begins its oat charge. While in oat, the charge
current diminishes as the battery accepts charge. Float
voltage temperature compensation and temperature fault
monitoring, if desired, are accomplished with an external
thermistor network.
Charge is active when the supply input is present as sensed
by the DCDIV pin and DCIN above UVLO, thermistor
temperature is ideal according to the thermistor monitor
circuit (see SafetySignal Decoder) and the charge register
bit CHARGE_INHIBIT is cleared. Soft-start ramps the charge
current at a rate set by the capacitor on the ITH pin. When
charge begins, the CHGb (GPIO1 pin) status output is
forced to GND. At any time charge can be forced to stop by
pulling the SHDN pin high or setting the CHARGE_INHIBIT
bit high through the SMBus.
If the battery voltage exceeds 107.5% (VBOV) of the pro-
grammed oat voltage during any stage of charge, the
charger pauses until the voltage drops below the hysteresis
(VBOVH). No fault is indicated.
An optional external NTC thermistor network can be used
to provide an adjustable negative TC for the oat voltage,
monitor battery temperature and to detect battery pres-
ence. If the thermistor value indicates a hot temperature,
voltage falling to VHOT on THB pin, charge current is halted,
CHG_FLTb (GPIO3 pin) is forced low and the CHG_FLT bit
will be set high. CHGb (GPIO1 pin) and CHG_STATE_0 and
CHG_STATE_1 register bits will not be affected. When the
thermistor value returns to ideal when the voltage exceeds
VHOT +VHOTH on THB pin, charge resumes CHG_FLTb
(GPIO3 pin) returns to high impedance and the CHG_FLT
bit will be reset low. An open thermistor indicates an
over-range which is considered absence of a battery.
Low temperature is not monitored. However, since bat-
tery removal detection looks at the thermistor for a high
resistance (VREMonTHBpin),extremelycoldtemperatures
may result in an indication of battery absence. To defeat
the temperature monitoring register, replace the thermis-
tor with a resistor to indicate normal battery temperature.
When a thermistor is not used the resistor circuit must be
routed through the battery connector if battery presence
detection is required.
BATTERY CALIBRATION MODE
Figure 6 shows the LTC4110 in battery calibration mode and
the corresponding PowerPath enabled. During calibration,
the host CPU can calibrate a gas gauge or verify the battery’s
ability to support a load by use of a low heat producing
method. Calibration requires a host to communicate over
a SMBus. In the low heat method, a synchronous PWM
yback charger is used in reverse to discharge the battery
with a programmable constant-current into the system
load thereby saving space and eliminating heat generation
compared with resistive loads. Protection circuits prevent
accidental overdrive back into the power source if the
system load is insufcient. The constant-charge current
is programmed by the combination of a resistor (RCAL)
from the ICAL pin to ground, a battery current sense resis-
tor (RSNS(BAT)) and CSP/CSN pin resistors. Calibration is
initiated by setting the CAL_START bit in the BBuControl()
register. The CAL_ON bit in the BBuStatus() register will
OPERATION
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4110EUHF#PBF | 功能描述:IC BATTERY BACKUP MANAGER 38-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 |
| LTC4110EUHF#PBF | 制造商:Linear Technology 功能描述:Battery Management IC |
| LTC4110EUHF#TRPBF | 功能描述:IC BATTERY BACKUP MANAGER 38-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) |
| LTC4110EUHF-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Battery Backup System Manager |
| LTC4110EUHF-TR | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Battery Backup System Manager |
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