TI’s TPS62601 converter for telecom apps

October 10, 2008

This August, Texas Instruments India (TII) announced the industry’s smallest and thinnest 500-mA, step-down DC/DC converter solution, the TPS62601 converter, for space-constrained applications.

According to TI, It gives portable designers the ability to add more features and functions on a handheld device. The high-efficiency power management IC is the first 6-MHz, 500-mA converter to achieve a 13-mm2 solution size with an ultra-thin 0.6-mm total height.

I caught up with Ramprasad Ananthaswamy, Director, Power Management Products, Texas Instruments India, to find out a bit more about this so-called industry’s smallest and thinnest converter solution, and its essential design trends.

So what exactly is the TPS62601 power converter targeted toward? According to Ananthaswamy, the TPS62601, a high-efficiency power management IC is the first 6-MHz, 500-mA converter to achieve a 13mm2 solution size with an ultra-thin 0.6-mm total height.

The TPS62601 converter achieves up to 89-percent power efficiency and only 30-uA typical operating quiescent current, all from a 0.9×1.3mm chip scale package roughly the size of a flake of pepper. The synchronous, switch-mode device’s fixed frequency of 6 MHz allows the use of only one 0.47-uH inductor with a height of 0.6 m and two low-cost ceramic capacitors, without compromising performance and efficiency.

The device supports applications, such as memory modules, GPS modules, Bluetooth and Wi-Fi modules or other wireless micro-modules used in ultra-thin smart phones, digital still cameras, portable disk drives and media players.

Applications areas of this device include: Smart and media phones; Cell phones; Media players; Mobile Internet devices; DSCs; and Other portable communications devices.

This chip will help powering sources such as: WLAN modules; WiFi modules; Bluetooth modules; Memory modules; and Generic micro modules.

Essential design trends
There is a need to understand the essential design trends of the TPS62601 that makes it unique. Ananthaswamy added that the TPS62601 can deliver DC voltage regulation accuracy of +/- 1.5 percent. In addition, its excellent load transient response, wide input voltage range of 2.3V to 5.5V and 1.8V of output allows the device to effectively support single-rail voltage requirements as designers add new features and functions.

The converter also applies energy-saving techniques to help maximize battery run-time. For example, the converter automatically enters a power save mode during light-load operating conditions via an automatic pulse frequency modulation and pulse width modulation switching feature. In shutdown mode, the device’s current consumption is reduced to less than 1 uA. 

Size and high-performance are important. The converter achieves up to 89-percent power efficiency and only 30-uA typical operating quiescent current, from a small chip scale package.

A high switching frequency of 6MHz reduces the size of the external components used around this chip, thereby reducing the total size of the power solution. A low quiescent current of 30 uA also makes it very attractive for portable applications requiring long run times.

Helping portable designers
Let us understand how the TPS62601 will actually enable the portable designers to add more features and functions on to a handheld device. Ananthaswamy says: “Portable system designers continue to desire more features on their devices, which require smaller, efficient DC/DC converters to maintain long battery life and system run-times. As the size of the total power solution is small, more PCB space becomes available for additional features that need to get added on to the cell phone. The TPS62601 gives portable designers access to the smallest, thinnest 500-mA DC/DC solution, which simplifies design and reduces board space and time-to-market.”

The converter also applies energy-saving techniques to help maximize battery run-time. For example, the converter automatically enters a power save mode during light-load operating conditions via an automatic pulse frequency modulation and pulse width modulation switching feature. In shutdown mode, the device’s current consumption is reduced to less than 1uA.

Power management
How well does the TPS62601 tackle power management issues? The biggest issue inside feature rich cell phones today is thermal management. This power converter, consuming only 30uA for its own operation, manages the thermal problem through efficient power conversion. “Better efficiency means less heat,” added Ramaswamy.

Energy-saving techniques
Elaborate on the energy-saving techniques that can help maximize battery run-time, he said: “Globally, switching regulators are efficient means of power conversion. This device is a buck derived switching regulator that efficiently converts the single cell Li-ion battery voltage to the one that is required by the various multimedia rich cell phone chips, like applications processors, GPS modules, digital multimedia broadcast chips, camera engines, WiFi etc.

“It can power all of these chips, while consuming as little as 30uA for its own operation. Depending on the input to output voltage ration, the conversion efficiency can also reach close to 90 percent. Less consumption, better conversion efficiencies, etc., all of these result in longer battery run times.”

Is it then safe to say that the maximizing battery run-time problem has been tackled with the TPS62601? Not exactly!!

According to Ramaswamy, the TPS62601 addresses part of the battery run-time issue. “With this initiative, TI has gone a step ahead in making the battery last longer,” he noted.

Making power converters efficient is only a part of the battery run-time issue. Along with making power converters efficient, one also has to look at how much power is consumed by the various chips that are used in a cell phone, the operating system that runs the cell phone and the overall power saving features that are built into the cell phone system. The speaker volume settings, backlight brightness settings and the duration of the backlight and some of the other user friendly settings have an effect on the battery run times.

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