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參數(shù)資料
| 型號： | LTC4058XEDD-4.2 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Standalone Linear Li-Ion Battery Charger with Thermal Regulation in DFN |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 3 X 3 MM, MO-229WEED-1, PLASTIC, DFN-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 180K |
| 代理商： | LTC4058XEDD-4.2 |
8
LTC4058-4.2/LTC4058X-4.2
sn405842 405842fs
OPERATIOU
Power Supply Status Indicator (ACPR)
The power supply status output has two states: pull-down
and high impedance. The pull-down state indicates that
V
CC
is above the UVLO threshold (3.8V) and is also 100mV
above the battery voltage. When these conditions are not
met, the ACPR pin is high impedance indicating that the
LTC4058 is unable to charge the battery.
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 LTC4058 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 LTC4058.
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. DFN power considerations are discussed fur-
ther in the Applications Information 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 BSENSE voltage. If the UVLO
comparator is tripped, the charger will not come out of
shutdown mode until V
CC
rises 100mV above the BSENSE
voltage.
Manual Shutdown
At any point in the charge cycle, the LTC4058 can be put
into shutdown mode by driving the EN pin high. This
reduces the battery drain current to less than 2
μ
A and the
supply current to less than 50
μ
A. When in shutdown
mode, the CHRG pin is in the high impedance state. A new
charge cycle can be initiated by driving the EN pin low. A
resistor pull-down on this pin forces the LTC4058 to be
enabled if the pin is allowed to float.
Automatic Recharge
Once the charge cycle is terminated, the LTC4058 continu-
ously monitors the voltage on the BSENSE pin using a
comparator with a 2ms filter time (t
RECHARGE
). A charge
cycle restarts when the battery voltage falls below 4.10V
(which corresponds to approximately 80% to 90% battery
capacity). This ensures that the battery is kept at, or near,
a fully charged condition and eliminates the need for
periodic charge cycle initiations. The CHRG output enters
a pull-down state during recharge cycles.
Figure 1. State Diagram of a Typical Charge Cycle
TRICKLE CHARGE
MODE
1/10TH FULL CURRENT
BSENSE > 2.9V
BSENSE < 2.9V
BSENSE > 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
EN DRIVEN LOW
OR
UVLO CONDITION
STOPS
EN DRIVEN HIGH
OR
UVLO CONDITION
POWER ON
PROG < 100mV
STANDBY MODE
NO CHARGE CURRENT
CHRG: Hi-Z
2.9V < BSENSE < 4.1V
405842 F01
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| LTC4059 | 制造商:LINEAR 制造商全稱:LINEAR 功能描述:Standalone 250mA Li-Ion Battery Charger in 2 × 2 DFN |
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| LTC4059AEDC#TR | 功能描述:IC BATT CHARGER LI-ION REG 6DFN RoHS:否 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 |
| LTC4059AEDC#TRM | 功能描述:IC BATT CHARGER LI-ION REG 6DFN RoHS:否 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 |
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