Product category: Power Supply ICs and Controllers
News Release from: Texas Instruments (April 2001-March 2006) | Subject: TPS721xx, TPS722xx, TPS793xx and TPS794xx
Edited by the Electronicstalk Editorial Team on 22 October 2001
LDOs and regulators
for single-cell power
The latest range of low dropout (LDO) regulators from Texas Instruments is capable of taking inputs directly from two AAA batteries
The new 1.8V input LDOs will make system design with off-the-shelf batteries easier, more efficient and less expensive. Also available are a pair of complementary LDO regulators with extremely low dropout, low noise, high power supply rejection ratio (PSRR) and fast startup in a small form factor.
This article was originally published on Electronicstalk on 22 October 2001 at 8.00am (UK)
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TI's new TPS721xx and TPS722xx LDO regulators achieve low dropout on a small die, extending battery life and saving board space in handheld systems powered by two AAA batteries.
The TPS793xx and TPS794xx LDOs use TI's proprietary process to save space and achieve extremely low dropout and low noise in several critical areas for mobile wireless systems.
The TPS721xx and TPS722xx LDOs accept input voltages ranging from 1.8 to 5.5V.
This family of LDOs offers designers a cost effective, more efficient portable system power solution.
The TPS721xx outputs 150mA of current and the TPS722xx outputs 50mA, which provides the capability to power up a high-performance low-voltage digital core directly from AAA batteries.
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These devices are available in 1.5, 1.6 and 1.8V fixed-output voltages and adjustable over a range of 1.2 to 5.5V.
Even with extremely low noise (30uV RMS), the devices are stable with just one low-ESR 0.1uF ceramic output capacitor and PMOS topology, which enables extremely low quiescent current.
The 200mA TPS793 and 250mA TPS794 LDOs complement the previously released TPS791 and TPS792 LDOs providing outstanding performance that meets the noise-sensitivity of wireless systems.
Featuring a high PSRR of 73dB at 10kHz the TPS79xx LDOs eliminate the RF noise coupled to the supply.
Other areas of excellent low-noise characteristics that simplify design include an output line transient of only +/-10 mV and a load transient of less than 1.5%.
An undervoltage lockout feature protects the batteries by preventing them from leaking current when the system is powered down.
TPS793xx and TPS794xx are available in 1.8, 2.5, 2.8, 2.85, 3.0, 3.3 and 4.75V fixed output voltages and are adjustable over a range of 1.2 to 5.5V.
The TPS79301 adjustable option uses an additional pin (6-pin SOT23 package) in order to maintain an independent bypass for low noise.
Another performance highlight of these devices is their fast start-up time of 53us.
TI's proprietary process minimises dropout to just 38mV at 100mA in a space-saving design.
This family of devices also uses low-cost low-ESR ceramic output capacitors for stability.
Samples of the TPS721xx and TPS722xx are available now, with volume production scheduled for the fourth quarter of 2001.
The devices are available with fixed output voltages in a 5-pin SOT23 package.
Planned pricing per unit in quantities of 100,000 units is $0.38 for the TPS721xx and $0.35 for the TPS722xx.
The TPS793xx and TPS794xx are now available in volume from TI and its authorized distributors.
The devices are available with fixed output voltages in SOT23, MSOP 8, and SOT223-5 packages.
Suggested resale pricing per unit in quantities of 100,000 units is $0.42 for the TPS793xx and $0.45 for the TPS794xx.
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