LP2951-33-Q1_15 Datasheet, PDF (12/30 Pages) Texas Instruments – Adjustable Micropower Voltage Regulators With Shutdown

LP2951-33-Q1, LP2951-50-Q1
SLVSAW6E – JUNE 2011 – REVISED NOVEMBER 2014
7 Detailed Description
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7.1 Overview
The LP2951-xx-Q1 devices are bipolar, low-dropout voltage regulators that can accommodate a wide input
supply-voltage range of up to 30 V. The 8-pin LP2951-xx-Q1 devices are able to output either a fixed or
adjustable output from the same device. By tying the OUTPUT and SENSE pins together, and the FEEDBACK
and V_TAP pins together, the LP2951-xx-Q1 devices output a fixed 5 V, 3.3 V, or 3 V (depending on the version).
Alternatively, by leaving the SENSE and V_TAP pins open and connecting FEEDBACK to an external resistor
divider, the output can be set to any value between 1.235 V to 30 V.
The 8-pin LP2951-xx-Q1 devices also offer additional functionality that makes them particularly suitable for
battery-powered applications. For example, a logic-compatible shutdown feature allows the regulator to be put in
standby mode for power savings. In addition, there is a built-in supervisor reset function in which the ERROR
output goes low when V_OUT drops by 6% of its nominal value for whatever reasons – due to a drop in V_IN, current
limiting, or thermal shutdown.
LP2951-xx-Q1 devices are designed to minimize all error contributions to the output voltage. With a tight output
tolerance (0.5% at 25°C), a very low output voltage temperature coefficient (20 ppm typical), extremely good line
and load regulation (0.3% and 0.4% typical), and remote sensing capability, the parts can be used as either low-
power voltage references or 100-mA regulators.
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