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SPX2954
250mA Low Dropout Voltage Regulator
Description
The SPX2954 and SPX2954A are low power voltage regulators. These devices are an excellent choice for use in battery-powered applications such as cordless telephones, radio control systems, and portable computers. The SPX2954 and SPX2954A feature low quiescent current and low dropout voltage (typ. 20mV at 100µA and 310mV at 250mA). This includes a tight initial tolerance (0.5% for SPX2954A), extremely good load and line regulation (0.05% typ.), and very low output temperature coefficient (20 ppm/°C typ.), making the SPX2954/SPX2954A useful as a low-power voltage reference.
The error flag output feature is used as a power-on reset for warning of a low output voltage, due to a falling input voltage. The logiccompatible shutdown feature enables the regulator to be switched ON and OFF. The SPX2954/SPX2954A is offered in a 3-pin SOT-223 package and an 8-pin SOIC package.
SOT-223-3 is available, SOIC-8 is obsolete
FEATURES ■ 5.0V and 3.3V versions at 250mA output ■ Accurate 0.5% for SPX2954A ■ Very low quiescent current ■ Low dropout: 310mV at 250mA ■ Extremely tight load and line regulation ■ Very low temperature coefficient ■ Current and thermal limiting ■ Need only 1µF for stability ■ Direct replacement for LP2954 ■ Error flag warns of output dropout ■ Logic-controlled electronic shutdown ■ Programmable output from 1.24V to 30V
Typical Application
VIN
100K ERROR OUTPUT
SHUTDOWN INPUT
5
ERROR
8
VIN
1
VOUT
SPX2954
3
SD GND
4
FB
7
1.23V
1.2 to 30V
+
R1
3.3μF
.01μF
VREF
R2
Typical Application
• www.maxlinear.com• 270DSR00
SPX2954
Absolute Maximum Ratings
Stresses beyond the limits listed below may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.
Power Dissipation...................................... Internally Limited
Lead Temperature (soldering, 5 seconds).................. 260°C
Storage Temperature................................... -65°C to 150°C
Operating Junction Temperature Range...... -40°C to 125°C
Input Supply Voltage........................................ -0.3V to 30V
Feedback Input Voltage.................................... -1.5V to 30V Shutdown Input Voltage................................... -0.3V to 30V Error Comparator Voltage................................ -0.3V to 30V ESD Rating.............................................................. 2kV Min
270DSR00
2
Rev. 1B
SPX2954
Electrical Characteristics
SOT-223-3 is available, SOIC-8 is obsolete Unless otherwise noted: VIN = VO + 1V, IL = 100µA, CL = 1µF(2) TA = 25°C.
Parameter 3.3V Versions
Output Voltage
Output Voltage 5V Versions
Output Voltage
Output Voltage All Voltage Options Output Voltage Temperature Coefficient(1) Line Regulation(3) Load Regulation(3)
Dropout Voltage(5)
Ground Current
Current Limit
Thermal Regulation Output Noise, 10Hz to 100kHz
8-Pin Version Only Reference Voltage Feedback Pi.