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| 型号： | TPS65140PWPG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2.6 A SWITCHING REGULATOR, 2100 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | GREEN, PLASTIC, HTSSOP-24 |
| 文件页数： | 3/31页 |
| 文件大小： | 1391K |
| 代理商： | TPS65140PWPG4 |
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Positive Charge Pump
Negative Charge Pump
Linear Regulator Controller
Soft Start
Fault Protection
SLVS497C – SEPTEMBER 2003 – REVISED APRIL 2006
up first with its soft start. If the output voltage has reached 91.25% of its output voltage, the negative charge
pump comes up next. The negative charge pump starts with a soft start and when the output voltage has
reached 91% of the nominal value, the positive charge pump comes up with the soft start. Pulling the enable pin
low shuts down the device. Dependent on load current and output capacitance, each of the outputs comes
down.
The TPS6514x series has a fully regulated integrated positive charge pump generating VO3. The input voltage
for the charge pump is applied to the SUP pin that is equal to the output of the main boost converter VO1. The
charge pump is capable of supplying a minimum load current of 20 mA. Higher load currents are possible
The TPS6514x sereis has a regulated negative charge pump using two external Schottky diodes. The input
voltage for the charge pump is applied to the SUP pin that is connected to the output of the main boost
converter VO1. The charge pump inverts the main boost converter output voltage and is capable of supplying a
minimum load current of 20 mA. Higher load currents are possible depending on the voltage difference between
The TPS6514x series includes a linear regulator controller to generate a 3.3-V rail which is useful when the
system is powered from a 5-V supply. The regulator is independent from the other voltage rails of the device and
has its own enable (ENR). Since most of the systems require this voltage rail to come up first it is recommended
to use a R-C delay on EN. This delays the start-up of the main boost converter which reduces the inrush current
as well.
The main boost converter as well as the charge pumps and linear regulator have an internal soft start. This
avoids heavy voltage drops at the input voltage rail or at the output of the main boost converter VO1 during
start-up. See Figure 10 and Figure 11. During softstart of the main boost converter VO1 the internal current limit
threshold is increased in three steps. The device starts with the first step where the current limit is set to 2/5 of
the typical current limit (2/5 of 2.3A) for 1024 clock cycles then increased to 3/5 of the current limit for 1024 clock
cycles and the 3rd step is the full current limit. The TPS65141 has an extended softstart time where each step is
2048 clock cycles.
All of the outputs of the TPS65140/45 have short-circuit detection and cause the device to go into shutdown.
The TPS65141, as an exception, does not enter shutdown in case one of the outputs falls below its power good
threshold. The main boost converter has overvoltage and undervoltage protection. If the output voltage VO1 rises
above the overvoltage protection threshold of typically 5% of VO1, then the device stops switching, but remains
operational. When the output voltage falls below this threshold, the converter continues operation. When the
output voltage falls below the undervoltage protection threshold of typically 8.75% of VO1, because of a
short-circuit condition, the TPS65140/45 goes into shutdown. Because there is a direct pass from the input to
the output through the diode, the short-circuit condition remains. If this condition needs to be avoided, a fuse at
the input or an output disconnect using a single transistor and resistor is required. The negative and positive
charge pumps have an undervoltage lockout (UVLO) to protect the LCD panel of possible latch-up conditions
due to a short-circuit condition or faulty operation. When the negative output voltage is typically above 9.5% of
its output voltage (closer to ground), then the device enters shutdown. When the positive charge pump output
voltage, VO3, is below 8% typical of its output voltage, the device goes into shutdown. See the fault protection
thresholds in the electrical characteristics table. The device is enabled by toggling the enable pin (EN) below 0.4
V or by cycling the input voltage below the UVLO of 1.7 V. The linear regulator reduces the output current to 20
mA typical under a short-circuit condition when the output voltage is typically < 1 V. See the functional block
diagram. The linear regulator does not go into shutdown under a short-circuit condition.
11
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| TPS65140PWPR | 功能描述:LCD 驱动器 Trp-Ch 2.1-A Swit Boost Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TPS65140PWPRG4 | 功能描述:LCD 驱动器 Trp-Ch 2.1-A Swit Boost Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TPS65140RGER | 功能描述:LCD 驱动器 Trp-Ch 2.1-A Swit Boost Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TPS65140RGERG4 | 功能描述:LCD 驱动器 Trp-Ch 2.1-A Swit Boost Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TPS65141PWP | 功能描述:LCD 驱动器 5V/1.6A(I/O) 4-CH Multi-Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
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