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參數(shù)資料
| 型號(hào)： | LTC1729CMS8-8.4 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Li-Ion Battery Charger Termination Controllers |
| 中文描述： | BATTERY CHARGE CONTROLLER, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 200K |
| 代理商： | LTC1729CMS8-8.4 |
6
LTC1729 Series
APPLICATIO
S I
FOR
ATIO
U
Block Diagram
Figure 2 shows the block diagram of the LTC1729. The IC
consists of six comparators, a resistive divider, a UVLO
block and a logic and timer block.
The comparator COMP1 is used to indicate
C
/10 charge
current threshold. (“
C
” is a term used to indicate the
Ampere-hour capacity of a cell.) Figure 3 details the
C
/10
detection circuit. The resistor and capacitor on the SENSE
pin filter the signal from the 0.2
current sense resistor
R1. The 100
μ
A current sink on the SENSE pin develops
20mV across the 200
resistor R2. This sets a 20mV
offset on COMP1 that sense resistor R1 must equal before
C
/10 current is indicated. The
C
/10 is not recognized by the
logic until it passes through a 3-second digital filter.
For cases where there are multiple batteries to be charged,
the LTC1729 detects when a battery is removed and resets
the timers for the next charge cycle. The battery present
detection is the primary function of comparator COMP2.
When the battery is disconnected from the LTC1729, the
voltage at the BAT pin will begin ramping upward. This is
due to a current source inside the charger or an external
pull-up resistor. Once the voltage on the BAT pin exceeds
the 4.5V/cell limit, COMP2 signals a V
MAX
= true to the
logic and turns on a transistor that clamps the voltage.
There is the possibility of an overvoltage transient at the
charging terminals. This occurs if the battery protection
circuit, which is often included in the battery pack, opens
the connection to the battery during high current charging
(constant-current mode). This is a result of energy storage
in the inductor. COMP2 senses the overvoltage and clamps
W
U
U
100
μ
A
50
μ
A
1729 F03
–
+
COMP1
STATUS
V
CC
CHARGE
LED
LTC1729
SENSE
BAT
+
+
–
–
R2
200
20mV
I
BIAS
20mV
R1
0.2
CHARGING
CURRENT
C1
1
μ
F
3-SEC
FILTER
LOGIC
AND
TIMERS
Figure 3.
C
/10 Detection Circuit
the V
C
pin, reducing the duty cycle of the charger. If the
battery protection circuit quickly returns battery connec-
tion to the charger (in less than one second), then the
LTC1729 continues charging without resetting the timers.
For a battery that has been over-discharged, the LTC1729
provides a 16mA start-up current. This preconditioning
trickle charge begins when the battery voltage drops
below 2.7V/cell. Comparator COMP3 is used to determine
when this condition exists. The battery operating range is
summarized in Figure 4.
With a 10k negative TC thermistor connected to the NTC
pin, the LTC1729 will disable charging if the temperature
is not in the 0
°
C to 50
°
C range. A thermistor must be
present at this pin, or if the temperature qualification
feature is not used, a 10k resistor must be used in its place.
This pin should not be left open. The NTC thermistor
monitoring circuits consist of COMP4, COMP5 and COMP6.
The NTC pin voltage range is shown in Figure 5.
Comparators COMP4 and COMP5 signal the logic when
the temperature is below 0
°
C or above 50
°
C. The 100
μ
A
bias current through the 10k
thermistor will generate
2.79V at 0
°
C and 0.405V at 50
°
C. The voltage hysteresis
on COMP4 and COMP5 is designed to give 10
°
C of
temperature hysteresis. If the voltage on the NTC pin
drops below 0.2V, the comparator COMP6 generates a
reset to the logic and timer block.
To provide accurate charge voltages, the internal resistor
divider is trimmed to provide a precise
±
0.2% voltage of
2.465V at the OVP pin for the four battery voltage options
of 4.1V, 4.2V, 8.2V and 8.4V.
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| LTC1729CS8-8.4 | Li-Ion Battery Charger Termination Controllers |
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| LTC1730-4.2 | Circular Connector; MIL SPEC:MIL-C-26482, Series I, Solder; Body Material:Aluminum; Series:PT01; No. of Contacts:5; Connector Shell Size:14; Connecting Termination:Solder; Circular Shell Style:Cable Receptacle; Body Style:Straight |
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| LTC1729CS8-4.1 | 功能描述:IC CTRLR BATT CHRGR LI-ION 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):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(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1729CS8-4.1#PBF | 功能描述:IC CTRLR BATT CHRGR LI-ION 8SOIC 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)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
| LTC1729CS8-4.1#TR | 功能描述:IC CTRLR BATT CHRGR LI-ION 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):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(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1729CS8-4.1#TRPBF | 功能描述:IC CTRLR BATT CHRGR LI-ION 8SOIC 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)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
| LTC1729CS8-4.2 | 功能描述:IC CTRLR BATT CHRGR LI-ION 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):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(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
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