LP2952A

Output voltage adjusts from 1.23V to 29V
Guaranteed 250 mA output current
Extremely low quiescent current
Low dropout voltage
Extremely tight line and load regulation
Very low temperature coefficient
Current and thermal limiting
Reverse battery protection
50 mA (typical) output pulldown crowbar
5V and 3.3V versions available

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Storage Temperature Range                                                        −65°C TA +150

Operating Temperature Range
LP2952I, LP2953I, LP2952AI,
LP2953AI, LP2952I-3.3,
LP2953I-3.3, LP2952AI-3.3,
LP2953AI-3.3                                                                                    −40 TJ +125
LP2953AM                                                                                           −55 TA +125
Lead Temp. (Soldering, 5 seconds)                                                                            260
Power Dissipation (Note 2) Internally Limited
Maximum Junction Temperature
LP2952I, LP2953I, LP2952AI,
LP2953AI, LP2952I-3.3,
LP2953I-3.3, LP2952AI-3.3,
LP2953AI-3.3                                                                                                            +125
LP2953AM                                                                                                                 +150
Input Supply Voltage                                                                                     −20V to +30V
Feedback Input Voltage (Note 3)                                                                    −0.3V to +5V
Comparator Input Voltage (Note 4)                                                               −0.3V to +30V
Shutdown Input Voltage (Note 4)                                                                  −0.3V to +30V
Comparator Output Voltage (Note4)                                                              −0.3V to +30V
ESD Rating (Note 15)                                                                                                     2 kV

The LP2952A and LP2953 are micropower voltage regulators with very low quiescent current (130 A typical at 1 mA load) and very low dropout voltage (typ. 60 mV at light load and 470 mV at 250 mA load current). They are ideally suited for battery-powered systems. Furthermore, the quiescent current increases only slightly at dropout, which prolongs battery life.

The LP2952A and LP2953 retain all the desirable characteristics of the LP2951, but offer increased output current, additional features, and an improved shutdown function.

The internal crowbar pulls the output down quickly when the shutdown is activated.

The error flag goes low if the output voltage drops out of regulation.

Reverse battery protection is provided.

The internal voltage reference is made available for external use, providing a low-T.C. reference with very good line and load regulation.

The parts are available in DIP and surface mount packages.