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參數(shù)資料
| 型號(hào)： | LTC4054LES5-4.2 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 150mA Standalone Linear Li-Ion Battery Charger in ThinSOT |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | PLASTIC, MO-193, TSOT-23, 5 PIN |
| 文件頁數(shù)： | 9/16頁 |
| 文件大小： | 191K |
| 代理商： | LTC4054LES5-4.2 |
9
LTC4054L-4.2
4054l42f
OPERATIOU
Charge Status Indicator (CHRG)
The charge status output has three different states: strong
pull-down (~10mA), weak pull-down (~20uA), and high
impedance. The strong pull-down state indicates that the
LTC4054L is in a charge cycle. Once the charge cycle has
terminated, the pin state is determined by undervoltage
lockout conditions. A weak pull-down indicates that V
CC
meets the UVLO conditions and the LTC4054L is ready to
charge. High impedance indicates that LTC4054L is in
undervoltage lock-out mode: either V
CC
is within 100mV
of the BAT pin voltage or insufficient voltage is applied to
the V
CC
pin. A microprocessor can be used to distinguish
between these three states—this method is discussed in
the Applications Information section.
Thermal Limiting
An internal thermal feedback loop reduces the programmed
charge current if the die temperature attempts to rise
above a preset value of approximately 120
°
C. This feature
protects the LTC4054L from excessive temperature and
allows the user to push the limits of the power handling
capability of a given circuit board without risk of damaging
the LTC4054L. The charge current can be set according to
typical (not worst-case) ambient temperature with the
assurance that the charger will automatically reduce the
current in worst-case conditions. ThinSOT power consid-
erations are discussed further in the Applications Informa-
tion section.
Undervoltage Lockout (UVLO)
An internal undervoltage lockout circuit monitors the input
voltage and keeps the charger in shutdown mode until V
CC
rises above the undervoltage lockout threshold. The UVLO
circuit has a built-in hysteresis of 200mV. Furthermore, to
protect against reverse current in the power MOSFET, the
UVLO circuit keeps the charger in shutdown mode if V
CC
falls to within 30mV of the battery voltage. If the UVLO
comparator is tripped, the charger will not come out of
shutdown mode until V
CC
rises 100mV above the battery
voltage.
Figure 1. State Diagram of a Typical Charge Cycle
TRICKLE CHARGE
MODE
1/10TH FULL CURRENT
BAT > 2.9V
BAT < 2.9V
BAT > 2.9V
CHRG: STRONG
PULL-DOWN
CHARGE MODE
FULL CURRENT
CHRG: STRONG
PULL-DOWN
SHUTDOWN MODE
I
CC
DROPS TO <25
μ
A
CHRG: Hi-Z IN UVLO
WEAK PULL-DOWN
OTHERWISE
PROG
RECONNECTED
OR
UVLO CONDITION
STOPS
PROG FLOATED
OR
UVLO CONDITION
POWER ON
PROG < 100mV
STANDBY MODE
NO CHARGE CURRENT
CHRG: WEAK
PULL-DOWN
2.9V < BAT < 4.05V
4054L42 F01
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4054X | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT |
| LTC4054X-4.2 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT |
| LTC4054XES5-4.2 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT |
| LTC4054XES5-4.2#PBF | 制造商:Linear Technology 功能描述:Constant Current/Voltage Charger Li-Ion 500mA 4.2V 5-Pin TSOT-23 |
| LTC4054XES5-4.2#TR | 功能描述:IC CHARGR BATTERY L-ION TSOT23-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):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(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
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