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參數(shù)資料
| 型號： | LTC4085EDE-3#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PDSO14 |
| 封裝： | 4 X 3 MM, PLASTIC, MO-229, DFN-14 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大小： | 275K |
| 代理商： | LTC4085EDE-3#TRPBF |
LTC4085-3
18
40853f
For example, if the full charge current is programmed
to 500mA with a 100k PROG resistor the CHRG pin will
change state at a battery charge current of 50mA.
Note: The end-of-charge (EOC) comparator that moni-
tors the charge current latches its decision. Therefore,
the rst time the charge current drops below 10% of the
programmed full charge current while in constant-volt-
age mode will toggle CHRG to a high impedance state.
If, for some reason, the charge current rises back above
the threshold the CHRG pin will not resume the strong
pull-down state. The EOC latch can be reset by a recharge
cycle (i.e. VBAT drops below the recharge threshold) or
toggling the input power to the part.
Current Limit Undervoltage Lockout
An internal undervoltage lockout circuit monitors the
input voltage and disables the input current limit circuits
until VIN rises above the undervoltage lockout threshold.
The current limit UVLO circuit has a built-in hysteresis of
125mV. Furthermore, to protect against reverse current in
the power MOSFET, the current limit UVLO circuit disables
the current limit (i.e. forces the input power path to a high
impedance state) if VOUT exceeds VIN. If the current limit
UVLO comparator is tripped, the current limit circuits will
not come out of shutdown until VOUT falls 50mV below
the VIN voltage.
Charger Undervoltage Lockout
An internal undervoltage lockout circuit monitors the VOUT
voltage and disables the battery charger circuits until
VOUT rises above the undervoltage lockout threshold. The
battery charger UVLO circuit has a built-in hysteresis of
125mV. Furthermore, to protect against reverse current
in the power MOSFET, the charger UVLO circuit keeps the
charger shut down if VBAT exceeds VOUT. If the charger
UVLO comparator is tripped, the charger circuits will not
come out of shutdown until VOUT exceeds VBAT by 50mV.
Suspend
The LTC4085-3 can be put in suspend mode by forcing
the SUSP pin greater than 1.2V. In suspend mode the ideal
diode function from BAT to OUT is kept alive. If power is
applied to the OUT pin externally (i.e., a wall adapter is
present) then charging will be unaffected. Current drawn
from the IN pin is reduced to 50μA. Suspend mode is
intended to comply with the USB power specication
mode of the same name.
NTC Thermistor—Battery Temperature Charge
Qualication
The battery temperature is measured by placing a nega-
tive temperature coefcient (NTC) thermistor close to the
battery pack. The NTC circuitry is shown in Figure 4.
To use this feature, connect the NTC thermistor (RNTC)
between the NTC pin and ground and a resistor (RNOM)from
the NTC pin to VNTC. RNOM should be a 1% resistor with
a value equal to the value of the chosen NTC thermistor at
25°C (this value is 10k for a Vishay NTHS0603N02N1002J
thermistor). The LTC4085-3 goes into hold mode when
the resistance (RHOT) of the NTC thermistor drops to 0.48
times the value of RNOM, or approximately 4.8k, which
should be at 45°C. The hold mode freezes the timer and
stops the charge cycle until the thermistor indicates a re-
turn to a valid temperature. As the temperature drops, the
resistance of the NTC thermistor rises. The LTC4085-3 is
designed to go into hold mode when the value of the NTC
thermistor increases to 2.82 times the value of RNOM. This
resistance is RCOLD. For a Vishay NTHS0603N02N1002J
thermistor, this value is 28.2k which corresponds to ap-
proximately 0°C. The hot and cold comparators each have
approximately 2°C of hysteresis to prevent oscillation
about the trip point. Grounding the NTC pin will disable
the NTC function.
OPERATION
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相關代理商/技術參數(shù) |
參數(shù)描述 |
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| LTC4085EDE-4#PBF | 功能描述:IC USB POWER MANAGER 14DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:* 標準包裝:61 系列:- 功能:電源管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應商設備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC4085EDE-4#TRPBF | 功能描述:IC USB POWER MANAGER 14DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:* 標準包裝:61 系列:- 功能:電源管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應商設備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC4085EDEPBF | 制造商:Linear Technology 功能描述:Li-Ion Charger + USB Power Mgr LTC4085 |
| LTC4085EDE-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:USB Power Manager with Ideal Diode Controller and Li-Ion Charger |
| LTC4085EDE-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:USB Power Manager with Ideal Diode Controller and Li-Ion Charger |
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