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| 型号： | LTC1734ES6-4.2#TR |
| 厂商： | Linear Technology |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHRGR LI-ION LIN SOT23-6 |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子，镍镉，镍氢 |
| 电源电压： | 4.55 V ~ 8 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 供应商设备封装： | TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC1734ES6-4.2TR |
LTC1734
APPLICATIO N S I N FOR M ATIO N
Table 1. PNP Pass Transistor Selection Guide
Maximum P D (W)
Mounted on Board
at T A = 25 ° C
0.5
0.625
1
1.1
1 to 2
2
2
0.75
1
2
10 (T C = 25 ° C)
Package Style
SOT-23
SOT-23
SOT-89
SOT-23-6
SOT-89
SOT-223
SOT-223
FTR
ATV
SOT-89
TO-252
ZETEX Part Number
FMMT549
FMMT720
FCX589 or BCX69
ZXT10P12DE6
FCX717
FZT589
BCP69 or FZT549
ROHM Part Number
2SB822
2SB1443
2SA1797
2SB1182
Comments
Low V CESAT
Very Low V CESAT, High Beta
Very Low V CESAT, High Beta, Small
Very Low V CESAT, High Beta
Low V CESAT
Low V CESAT
Low V CESAT
Low V CESAT
Low V CESAT, High Beta
Once the maximum power dissipation and V CE(MIN) are
known, Table 1 can be used as a guide in selecting some
PNPs to consider. In the table, very low V CESAT is less than
0.25V, low V CESAT is 0.25V to 0.5V and the others are 0.5V
to 0.8V all depending on the current. See the manufacturer’s
data sheet for details. All of the PNP transistors are rated
to carry at least 1A continuously as long as the power
dissipation is within limits. The Stability section addresses
caution in the use of high beta PNPs.
Should overheating of the PNP transistor be a concern,
protection can be achieved with a positive temperature
coefficient (PTC) thermistor, wired in series with the
current programming resistor and thermally coupled to
the transistor. The PTH9C chip series from Murata has a
steep resistance increase at temperature thresholds from
85 ° C to 145 ° C making it behave somewhat like a thermo-
stat switch. For example, the model PTH9C16TBA471Q
thermistor is 470 ? at 25 ° C, but abruptly increase its
resistance to 4.7k at 125 ° C. Below 125 ° C, the device
exhibits a small negative TC. The 470 ? thermistor can be
added in series with a 1.6k resistor to form the current
programming resistor for a 700mA charger. Should the
thermistor reach 125 ° C, the charge current will drop to
238mA and inhibit any further increase in temperature.
constant voltage mode, a capacitor of at least 4.7 μ F is
usually required from BAT to ground. The battery and
interconnecting wires appear inductive at high frequen-
cies, and since these are in the feedback loop, this capaci-
tance may be necessary to compensate for the inductance.
This capacitor need not exceed 100 μ F and its ESR can
range from near zero to several ohms depending on the
inductance to be compensated. In general, compensation
is optimal with a capacitance of 4.7 μ F to 22 μ F and an ESR
of 0.5 ? to 1.5 ? .
Using high beta PNP transistors (>300) and very low ESR
output capacitors (especially ceramic) reduces the phase
margin, possibly resulting in oscillation. Also, using high
value capacitors with very low ESRs will reduce the phase
margin. Adding a resistor of 0.5 ? to 1.5 ? in series with
the capacitor will restore the phase margin.
In the constant current mode, the PROG pin is in the
feedback loop, not the battery. Because of this, capaci-
tance on this pin must be limited. Locating the program
resistor near the PROG pin and isolating the charge
current monitoring circuitry (if used) from the PROG pin
with a 1k to 10k resistor may be necessary if the capaci-
tance is greater than that given by the following equation:
Stability
The LTC1734 contains two control loops: constant voltage
and constant current. To maintain good AC stability in the
10
C MAX ( pF ) =
400 k
R PROG
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| LTC1734LES6-4.2 | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion/NiCD/NiMH 50mA to 180mA 4.2V 6-Pin TSOT-23 |
| LTC1734LES6-4.2#PBF | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion/NiCD/NiMH 50mA to 180mA 4.2V 6-Pin TSOT-23 |
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| LTC1734LES6-4.2#TRM | 功能描述:IC CHARGER BATT LIN LI-ION SOT23 RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:2,000 系列:Impedance Track™ 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.4 V ~ 2.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:带卷 (TR) 产品目录页面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名称:296-21665-2 |
| LTC1734LES6-4.2#TRMPBF | 功能描述:IC CHARGER BATT LIN LI-ION SOT23 RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
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