The TPS6514x series offers a compact and small power supply solution to provide all three voltages required by thin film transistor (TFT) LCD displays. The auxiliary linear regulator controller can be used to generate a 3.3-V logic power rail for systems powered by a 5-V supply rail only.
The main output VO1 is a 1.6-MHz fixed frequency PWM boost converter providing the source drive voltage for the LCD display. The device is available in two versions with different internal switch current limits to allow the use of a smaller external inductor when lower output power is required. The TPS65140 and TPS65141 has a typical switch current limit of 2.3 A and the TPS65145 has a typical switch current limit of 1.37 A. A fully integrated adjustable charge pump doubler or tripler provides the positive LCD gate drive voltage. An externally adjustable negative charge pump provides the negative gate drive voltage. Due to the high 1.6-MHz switching frequency of the charge pumps, inexpensive and small 220-nF capacitors can be used.
Additionally, the TPS6514x series has a system power good output to indicate when all supply rails are acceptable. For LCD panels powered by 5 V the device has a linear regulator controller using an external transistor to provide a regulated 3.3-V output for the digital circuits. For maximum safety, the TPS65140 and TPS65145 goes into shutdown as soon as one of the outputs is out of regulation. The device can be enabled again by toggling the input or the enable (EN) pin to GND. The TPS65141 does not enter shutdown when one of its outputs is below its power good threshold.
| Typ | Titel | Datum | ||
|---|---|---|---|---|
| * | Data sheet | TPS6514x Triple Output LCD Supply With Linear Regulator and Power Good datasheet (Rev. F) | PDF | HTML | 29 Jun 2016 |
| Application note | Basic Calculation of a Boost Converter's Power Stage (Rev. D) | PDF | HTML | 28 Okt 2022 | |
| Application note | Understanding Undervoltage Lockout in Power Devices (Rev. A) | 19 Sep 2018 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Application note | Basic calculation of an inverting buck-boost power stage (Rev. A) | 28 Aug 2017 | ||
| Application note | How to Estimate the Output Voltage Range of the Charge Pumps in the TPS6510x | 08 Aug 2017 | ||
| Application note | How to Compensate the TPS6510x and the TPS6514x | 30 Aug 2016 | ||
| Application note | Generation of a VCOM buffer input using PWM signal | 21 Dez 2015 | ||
| Application note | Minimizing Ringing at the Switch Node of a Boost Converter | 15 Sep 2006 | ||
| Application note | Customizing your TPS6510x/TPS6514X | 22 Jun 2004 |
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| Gehäuse | Pins | Herunterladen |
|---|---|---|
| HTSSOP (PWP) | 24 | Optionen anzeigen |
| VQFN (RGE) | 24 | Optionen anzeigen |
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