參數(shù)資料
型號(hào)： SC803IMLTR
廠商： Semtech Corporation
英文描述： Fully Integrated High Current Lithium-Ion Battery Charger System
中文描述： 完全集成的高電流鋰離子電池充電系統(tǒng)
文件頁(yè)數(shù)： 7/17頁(yè)
文件大?。?/td> 747K
代理商： SC803IMLTR
7
2004 Semtech Corp.
www.semtech.com
SC803
POWER MANAGEMENT
Applications Information (Cont.)
The CP output can be used for a UVLO indicator. Regard-
less of the state of EN, the CP output reflects the volt-
age of the VCC (adapter) input. When VCC is above UVLO,
CP is high, 2.8V. When VCC is below UVLO, CP is low, 0V.
The CP pin can also put the device into the charge mode
whenever the adaptor has power, by connecting it to the
BIP pin.
The OVP LED will light whenever the SC803 is enabled
and there is an overvoltage on the VCC pins. When this
occurs the SC803 will turn off and stay off as long as the
overvoltage condition remains. As soon as the overvolt-
age is removed the SC803 will resume operation. The
OVP LED will not light if the part is disabled, even though
an overvoltage is present on the VCC pins.
Configuring the Output Voltage to the Battery
The battery voltage is set by the VPRGM pin. If this pin is
logic high the output voltage is set to 4.2V. If this pin is
logic low the output voltage will be set to 4.1V. The VPRGM
pin can be tied to the CP pin for 4.2V operation and ground
for 4.1V operation. For a value other than 4.1V or 4.2V a
resistor divider is required. This divider is set between
the VOUT pin and the VPRGM pin with the divider tap
connected to the BSEN pin. The schematic for such a
connection and the equation to set the output voltage is
given in Figure 1. The output voltage for Figure 1 will be
set to 4.77V with the resistors shown. The capacitor C1
may be needed for stability and or reduced ripple volt-
age. It is advisable to leave room on the PCB for adding
this capacitor, since it can be left out if it is not needed.
The evaluation board does have a place for the resistor
divider and capacitor to allow an adjustable voltage to
be set on this board via R1, R2 and C2 (see schematic
on page 10). With JP7 removed, jumper JP2 should be
added to complete the changes required for adjustable
mode operation on the evaluation board. For further
evaluation board information, see the section tilted Evalu-
ation Board.
R2
CHARGER
PRESENT
BATTERY
+5V
R4
59K
C1
330pF
STATUS
SC803
14
13
1
16
3
7
4
8
6
15
12
9
2
10
11
5
VCC
VCC
BSEN
VOUT
IPRGM
EN
ITERM
BIP
GND
VOUT
NC
OVP
STAT
VPRGM
CP
NC
C2
1uF
FAULT
C3
2.2uF
R1
R3
100K
3.0
R3
R4
1
VOUT
FIGURE 1
+
=
Remote Kelvin Sensing at the Battery
Another nice feature of the SC803 is its ability to sense
the battery voltage directly at the battery with its Kelvin
BSEN pin. This allows the designer great flexibility in PCB
layout and achieves a much greater accuracy in sensing
the battery voltage where it counts, at the battery termi-
nals! Therefore, when laying out the PCB the designer
should route the BSEN pin directly to the terminal at which
the battery gets connected. In addition, in the LDO mode,
the BSEN pin will still need to sense the output voltage.
In LDO mode, the BSEN pin becomes the regulation feed-
back for the control-loop. In this case it is sensing the
output voltage of itself, since the battery is not in place.
Therefore BSEN should never be left floating.
Capacitor Selection
Input and output capacitors can be low cost ceramic type.
The output capacitance range is 1uF to 4.7uF. The input
capacitor should be between 0.1uF to 1uF.
Overcurrent and Temperature Protection
Overcurrent protection is inherent to the SC803. The
SC803 operates as a current source and the output cur-
rent is limited by the mode it is in at the time. If in the
fast-charge mode the current is limited by the IPRGM
resistor, the fast-charge current. When the output volt-
age is less than 2.8V, the current is limited by the ITERM
resistor, the pre-charge current. Both of these functions
protect the device in an event of a short circuit condition
on the output. In the LDO mode the current is limited to
the fast-charge current, provided there is voltage on the
output. Under a short circuit condition in the LDO mode
the current will enter a “hiccup” mode. The temperature
shutdown can protect the device in conditions of excess
current as well, by shutting down the device when its die
temperature exceeds 165
o
C.
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相關(guān)PDF資料
PDF描述
SC803IMLTRT Fully Integrated High Current Lithium-Ion Battery Charger System
SC805A Miniature Integrated High Current Lithium-Ion Battery Charger
SC805AEVB Miniature Integrated High Current Lithium-Ion Battery Charger
SC805AMLTRT Miniature Integrated High Current Lithium-Ion Battery Charger
SC806EVB Miniature High Current Lithium-Ion Battery Charger
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SC803IMLTRT 制造商:Semtech Corporation 功能描述:Constant Current/Voltage Charger Li-Ion/NiCD/NiMH 1500mA 4.2V/4.1V 16-Pin MLP EP T/R 制造商:Semtech Corporation 功能描述:Controller IC Leaded Process Compatible:
SC804 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Fully Integrated Lithium-Ion Battery Charger System with Timer
SC804A 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Fully Integrated 4.4V Lithium-Ion Battery Charger System with Timer
SC804AMLTRT 功能描述:IC LI-ION BATT CHARGER 16-MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:充電管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁(yè)面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT
SC804EVB 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Fully Integrated 4.4V Lithium-Ion Battery Charger System with Timer
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