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參數資料
| 型號： | LTC4008EGN-1#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4A, High Efficiency, Multi-Chemistry Battery Charger; Package: SSOP; No of Pins: 20; Temperature Range: -40°C to +125°C |
| 中文描述： | BATTERY CHARGE CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-20 |
| 文件頁數： | 24/24頁 |
| 文件大?。?/td> | 221K |
| 代理商： | LTC4008EGN-1#TRPBF |
LTC4008
9
4008fb
OPERATION
TEST CIRCUIT
–
+
–
+
–
+
EA
LT1055
LTC4008
VREF
BAT
7
13
12
CSP
11
ITH
0.6V
4008 TC
9
BATMON
90.325k
9.675k
VFB
OVERVIEW
The LTC4008 is a synchronous current mode PWM step
down (buck) switcher battery charger controller. The
charge current is programmed by the combination of a
program resistor (RPROG) from the PROG pin to ground
and a sense resistor (RSENSE) between the CSP and BAT
pins. The nal oat voltage is programmed with an external
resistor divider and the internal 1.19V reference voltage.
Charging begins when the potential at the DCIN pin rises
above the voltage at BAT (and the UVLO voltage) and the
ACP/SHDN pin is high. An external thermistor network is
sampled at regular intervals. If the thermistor value exceeds
design limits, charging is suspended and the FAULT pin is
set low. If the thermistor value returns to an acceptable
value, charging resumes and the FAULT pin is set high. An
external resistor on the RT pin sets the sampling interval
for the thermistor.
As the battery approaches the nal oat voltage, the
charge current will begin to decrease. When the current
drops to 10% of the full-scale charge current, an internal
C/10 comparator will indicate this condition by latching
the FLAG pin low. If this condition is caused by an input
current limit condition, described below, then the FLAG
indicator will be inhibited. When the input voltage is not
present, the charger goes into a sleep mode, dropping
battery current drain to 15μA. This greatly reduces the
current drain on the battery and increases the standby
time. The charger can be inhibited at any time by forcing
the ACP/SHDN pin to a low voltage. Forcing ACP/SHDN
low, or removing the voltage from DCIN, will also clear
the FLAG pin if it is low.
Table 1. Truth Table For Indicator States
MODE
DCIN
ACP/SHDN
FLAG**
FAULT**
ICL
Shutdown by low adapter voltage (Disabled on LTC4008-1)
<BAT
LOW
HIGH
LOW
Normal charging
>BAT
HIGH
HIGH*
Input current limited charging
>BAT
HIGH
HIGH*
LOW
Charger shut down due to thermistor out of range
>BAT
HIGH
X
LOW
HIGH
Shut down by ACP/SHDN pin (USER)
X
Forced LOW
HIGH
LOW
Shut down by undervoltage lockout
>BAT + <UVL
HIGH
HIGH*
LOW
*Most probable condition, **Open-drain output, HIGH = Open with pull-up, X = Don’t care
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC4008EGNPBF | 制造商:Linear Technology 功能描述:4A, High Eff Li-Ion Charger LTC4008EGN |
| LTC4009 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Voltage High Current Controller for Battery Charging and Power Management |
| LTC4009-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger |
| LTC4009-2 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger |
| LTC4009CUF#PBF | 功能描述:IC CHARGER BATTERY MC 20-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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