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參數(shù)資料
| 型號： | LTC4001-1EUF#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封裝： | 4 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-220WGGC, QFN-16 |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 227K |
| 代理商： | LTC4001-1EUF#TRPBF |
10
LTC4001-1
40011f
APPLICATIO S I FOR ATIO
WU
UU
Soft-Start and Compensation Capacitor Selection
The LTC4001-1 has a low current trickle charger and a
PWM-based high current charger. Soft-start is used when-
ever the high rate charger is initially turned on, preventing
high start-up current. Soft-start ramp rate is set by the
internal 12.8
A pull-up current and an external capacitor.
The control range on the SS pin is approximately 0.3V to
1.6V. With a 0.1
F capacitor, the time to ramp up to
maximum duty cycle is approximately 10ms.
The external capacitor on the SS pin also sets the compen-
sation for the current control loop and the float voltage
control loop. A minimum capacitance of 10nF is required.
Charge Current and IDET Programming
The LTC4001-1 has two different charge modes. If the
battery is severely depleted (battery voltage less than
2.9V) a 50mA trickle current is initially used. If the battery
voltage is greater than the trickle charge threshold, high
rate charging is used.
This higher charge current is programmable and is ap-
proximately 915 times the current delivered by the PROG
pin. This current is usually set with an external resistor
from PROG to GNDSENS, but it may also be set with a
current output DAC connected to the PROG pin. The
voltage on the PROG pin is nominally 1.213V.
For 2A charge current:
R
V
A
PROG =
915 1 213
2
554 9
.
The IDET threshold (a charge current threshold used to
determine when the battery is nearly fully charged) is
programmed in much the same way as the PROG pin,
except that the IDET threshold is 91.5 times the current
delivered by the IDET pin. This current is usually set with
an external resistor from IDET to ground, but it may also
be set with a current output DAC. The voltage on the PROG
pin is nominally 1.213V.
For 200mA IDET current (corresponding to C/10 for a
2AHr battery):
R
V
A
IDET =
91 5 1 213
02
554 9
. .
.
1.10k
programs approximately 100mA and 274 ap-
proximately 400mA.
For applications where IDET is set to one tenth of the high
rate charge current, and slightly poorer charger current
and IDET threshold accuracy is acceptable, the PROG and
IDET pins may be tied together and a single resistor, R1,
can program both (Figure 1).
R
ICHARGE
1
457 5 1 213
=
. .
and
IDET
ICHARGE
=
10
Figure 1. Programming Charge Current and
IDET Threshold with a Single Resistor
PROG
LTC4001-1
IDET
R1
274
FOR 2A
GNDSENS
40011 F01
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4001EUF | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion/Li-Pol 2000mA 4.2V 16-Pin QFN EP |
| LTC4001EUF#PBF | 功能描述:IC CHARGER LI-ION BUCK 16-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(chǎn)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 |
| LTC4001EUF#TRPBF | 功能描述:IC CHARGER LI-ION BUCK 16-QFN 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 |
| LTC4001EUF-1#PBF | 功能描述:IC CHARGER LI-ION BUCK 16-QFN 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 |
| LTC4001EUF-1#PBF | 制造商:Linear Technology 功能描述:IC BATT CHARGER SW MODE 16QFN |
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