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| 型号： | LTC1734ES6-4.2#TR |
| 厂商： | Linear Technology |
| 文件页数： | 11/12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
Higher charge currents require lower program resistor
values which can tolerate more capacitive loading on the
PROG pin. Maximum capacitance can be as high as 50pF
for a charge current of 200mA (R PROG = 7.5k).
Figure 4 is a simple test circuit for checking stability in both
the constant current and constant voltage modes. With
input power applied and a near fully charged battery
connected to the charger, driving the PROG pin with a
pulse generator will cycle the charger in and out of the
manual shutdown mode. Referring to Figure 5, after a
short delay, the charger will enter the constant current
mode first, then if the battery voltage is near the pro-
grammed voltage of 4.1V or 4.2V, the constant voltage
mode will begin. The resulting waveform on the PROG pin
is an indication of stability.
of instability due to any combination of extremely low ESR
values, high capacitance values of the output capacitor or
very high PNP transistor beta. To minimize the effect of the
scope probe capacitance, a 10k resistor is used to isolate
the probe from the program pin. Also, an adjustable load
resistor or current sink can be used to quickly alter the
charge current when a fully charged battery is used.
Reverse Input Voltage Protection
In some applications, protection from reverse voltage on
V CC is desired. If the supply voltage is high enough, a
series blocking diode can be used. In other cases, where
the voltage drop must be kept low, a P-channel FET as
shown in Figure 6 can be used.
*
The double exposure photo in Figure 5 shows the effects
V IN
V CC
LTC1734
of capacitance on the program pin. The middle waveform
is typical while the lower waveform indicates excessive
program pin capacitance resulting in constant current
mode instability. Although not common, ringing on the
constant voltage portion of the waveform is an indication
1734 F06
*DRAIN-BULK DIODE OF FET
Figure 6. Low Loss Reverse Voltage Protection
V CC Bypass Capacitor
10k
TO SCOPE
R PROG
3k
2.5V
0V
f = 1kHz
PROG BAT
+
Li-Ion*
LTC1734
1734 F04
*FULLY CHARGED CELL
6 ? TO
20 ?
Many types of capacitors with values ranging from 1 μ F to
10 μ F located close to the LTC1734 will provide adequate
input bypassing. However, caution must be exercised
when using multilayer ceramic capacitors. Because of the
self resonant and high Q characteristics of some types of
ceramic capacitors, high voltage transients can be gener-
ated under some start-up conditions, such as connecting
Figure 4. Setup for AC Stability Testing
the charger input to a hot power source. To prevent these
transients from exceeding the absolute maximum voltage
PULSE
GENERATOR
PROG PIN
(20pF ON PIN)
5V
0V
2V
1V
0V
2V
rating, several ohms of resistance can be added in series
with the ceramic input capacitor.
Internal Protection
Internal protection is provided to prevent excessive DRIVE
pin currents (I DSHRT ) and excessive self-heating of the
LTC1734 during a fault condition. The faults can be
PROG PIN
(200pF ON PIN)
1V
0V
SHUT DELAY
DOWN
CONSTANT
CURRENT
CONSTANT
VOLTAGE
generated from a shorted DRIVE pin or from excessive
DRIVE pin current to the base of the external PNP
transistor when it’s in deep saturation from too low a V CE .
This protection is not designed to prevent overheating of
HORIZONTAL SCALE: 100 μ s/DIV
Figure 5. Stability Waveforms
the external pass transistor. Indirectly though, self-heating
of the PNP thermally conducting to the LTC1734 and
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
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相关代理商/技术参数 |
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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 |
| LTC1734LES6-4.2#TR | 功能描述:IC CHARGER BATT CONSTV/I SOT23-6 RoHS:否 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 |
| 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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