CCS/TPS65300-Q1: TMS320F28335 PMIC

Hi,

I have assigned your request to concerned Applications Engineer and we will get back to as soon as possible.

Regards,

Murthy

Hi Choi,

The TPS65300 and 65301 have the resistor dividers integrated in the device, it is probably possible to add an additional resistor divider externally but I'm not aware of anyone doing so.

I think a better alternative for what you are looking for is the TPS65381A-Q1, www.ti.com/.../tps65381a-q1.  It is a more recent PMIC and is being used with the latest C2000 DSPs even for functional safety applications, TMS320F2837x is used as example in this devices safety manual.  It has an additional voltage rail to match the number of rails you are indicating. 

There is a buck pre-regulator to 6V (1.3A), then cascaded LDO's and LDO controller:

VDD1 (LDO controller with external FET) for core rail (0.8V to 3.3V, adjustable) up to 600mA depending on board thermal capabilities (optional to use a DCDC instead but still use VDD1 voltage monitor).

VDD3/5:  normally used for processor IO rail (configurable for 3.3V or 5V output, up to 300 mA).

VDD5:  5V output, usually used for CAN transceiver or other system peripherals up to 300mA.

VSOUT1:  sensor LDO, two modes of operation tracking (with or without gain) or adjustable output.  3.3V to 9.5V output up to 100mA.

Please let me know if you have further questions.

Best Regards,

Scott

Dear TI

Thank you for your feedback. But it does not fit the conditions I want to use.

I have to review another parts more. I am not a very high level engineer and it is difficult to use the parts you suggested. Because I design the power supply with a lot of noise, I get higher power requirements for the controller design. Ti's products have subdivided characteristics such as ldo, dcdc, and multi-output, but lack one characteristic, but output current is low. Peak current characteristics under limited conditions provide rms-based output current characteristics and stable power supply characteristics in noisy environments.

I am not designing 1A ldo to get the actual continuous 1A output current. For the 28355, the 1.9V power supply works well if only 300mA of current is supplied, but there should be more room for more noisy circuits. The same reason for 3.3v 5.0V power supply I want to make more than double the margin of current I use. In the case of developing a large-capacity power supply device, since the number of products is small, the burden on each circuit is small.

Not only the power supply of the MCU but also the actual controller contains a lot of digital analog circuits. By integrating all these circuits, the actual required current condition becomes higher. If you look at the market, most engineers who design DSPs will have a large circuit to integrate CPU and peripheral circuits. (Why do you think the dsp controller is small?) I think TI's LDO or PMIC products for high-capacity, multi-output DSPs are lacking.

Perhaps TI component developers may not understand it. In my case the small controller does not make the power supply small, efficient and cheap. In a noisy environment, the problem with the power supply is random and hard to find debugging. Rather, it is a better choice to invest in the stability and output capacity of the power circuit and ensure stability.

I am now using four ics, analog LDO, digital LDO, and dual LDO for DSP, buck 24v/5.3v. The problem is that TI's LDOs are sensitive to input power noise because there are many conditions where the input voltage condition is as low as 5.5V. Higher input voltage conditions can lead to losses, use of products other than TI's products, or abandon the precision or stability of power circuits.

I hope that the ldo and pmic devices have a wide input voltage, higher output, and interfaces suitable for large-scale circuits.

Hi Choi,

Since you have not really specified number of rails, voltage levels and currents it is very difficult to help point you to specific devices. We have a wide range of other catalog PMICs, LDOs and DCDC converters and controllers. It seems your system has much higher current requirements on the rails than many of our other customers and it seems you are not interested in functional safety. Some other PMICs you may look at that have higher current capability are: TPS65310A-Q1, TPS65311-Q1 with wide VIN with 5 rails including a buck controller (external FETs) so you can scale to very high output current as needed. This is just one example. Other options are using low voltage PMICS and use a BUCK converter or controller with high output as a pre-regulator.

You can use the following pages to help you find what you may be looking for:
http://www.ti.com/pmic
www.ti.com/.../power_portal.page

Best Regards,
Scott