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参数资料
| 型号： | LTC3550EDHC-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATT DUAL 16-DFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4.3 V ~ 8 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFDFN 裸露焊盘 |
| 供应商设备封装： | 16-DFN（5x3） |
| 包装： | 带卷 (TR) |
LTC3550-1
APPLICATIO S I FOR ATIO
Figure 2 shows the basic LTC3550-1 application circuit.
External component selection is driven by the charging
requirements and the buck regulator load requirements.
Programming Charge Termination
The charge cycle terminates when the charge current falls
below the programmed termination threshold during con-
stant-voltage mode. This threshold is set by connecting an
C OUT
R ITERM =
, I TERMINATE =
WALL
ADAPTER
USB
POWER
C1
C2
LTC3550-1
RUN SW
DCIN V OUT
USBIN V CC
IUSB BAT
R IUSB
IDC ITERM
GND
R IDC
L1
C IN
R ITERM
+
V OUT
1.875V
600mA
4.2V
SINGLE
CELL Li-Ion
external resistor, R ITERM , from the ITERM pin to ground.
The charge termination current threshold (I TERMINATE ) is
set by the following equation:
100 V 100 V
I TERMINATE R ITERM
BATTERY
3550-1 F02
Figure 2. LTC3550-1 Basic Circuit
Programming and Monitoring Charge Current
The charge current delivered to the battery from the wall
adapter supply is programmed using a single resistor
from the IDC pin to ground. Likewise, the charge current
from the USB supply is programmed using a single resis-
tor from the IUSB pin to ground. The program resistor
and the charge current (I CHRG ) are calculated using the
following equations:
The termination condition is detected by using an internal
?ltered comparator to monitor the ITERM pin. When the
ITERM pin voltage drops below 100mV* for longer than
t TERMINATE (typically 1.5ms), charging is terminated. The
charge current is latched off and the LTC3550-1 enters
standby mode.
When charging, transient loads on the BAT pin can cause
the ITERM pin to fall below 100mV for short periods of
time before the DC charge current has dropped below the
programmed termination current. The 1.5ms ?lter time
(t TERMINATE ) on the termination comparator ensures that
transient loads of this nature do not result in premature
R IDC =
1000 V
I CHRG ( DC )
, I CHRG ( DC ) =
1000 V
R IDC
charge cycle termination. Once the average charge current
drops below the programmed termination threshold, the
LTC3550-1 terminates the charge cycle and stops providing
R IUS B =
1000 V
I CHRG ( USB )
, I CHRG ( USB ) =
1000 V
R IUSB
any current out of the BAT pin. In this state, any load on
the BAT pin must be supplied by the battery.
I BAT =
V IDC
= IUSB ? 1000 ( ch arg ing from USB sup ply )
Charge current out of the BAT pin can be determined at
any time by monitoring the IDC or IUSB pin voltage and
using the following equations:
? 1000 ( ch arg ing from wall adapter )
R IDC
V
I BAT
R IUSB
Buck Regulator Inductor Selection
For most applications, the value of the inductor will fall in
the range of 1μH to 4.7μH. Its value is chosen based on
the desired inductor ripple current. Large value inductors
lower ripple current and small value inductors result in
higher ripple currents. Higher V CC or V OUT also increases
the ripple current as shown in Equation 1. A reasonable
starting point for setting ripple current is Δ I L = 240mA
(40% of 600mA).
? I L = OUT ? ? 1 ? OUT ?
V ? V ?
f O ? L ? V CC ?
(1)
* Any external sources that hold the ITERM pin above 100mV will prevent the LTC3550-1
from terminating a charge cycle.
35501f
15
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相关代理商/技术参数 |
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| LTC3552 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter |
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| LTC3552EDHC#PBF | 功能描述:IC CHARGER BATT LI-ION 16-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC3552EDHC#TRPBF | 功能描述:IC CHARGER BATT LI-ION 16-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
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