Document
® SPX2950/SPX2951
150mA Low Dropout Voltage Regulator
FEATURES
■ 5.0V and 3.3V at 150mA Output ■ Accurate: 0.5% for SPX2950A/SPX2951A ■ Very Low Quiescent Current ■ Low Dropout Voltage: 300mV at 150mA ■ Extremely Tight Load and Line Regulation ■ Very Low Temperature Coefficient ■ Current & Thermal Limiting ■ Need Only 1µF for Stability ■ Offered in TO-92 (SPX2950) and SOIC
(SPX2951) ■ Direct Replacement for LP2950/LP2951
SPX2951 versions only ■ Error Flag Warns of Output Dropout ■ Logic-Controlled Electronic Shutdown ■ Output Programmable From 1.24 to 29V
8-Pin Surface Mount (S)
OUTPUT SENSE
SHUTDOWN
GROUND
1 2 3 4
8 INPUT 7 FEEDBACK 6 5V or 3.3V Output 5 ERROR
VOUT
TO-92 (N) 1 23
GROUND
VIN
SPX2951 Top View
SPX2950 Bottom View
Now Available in Lead Free Packaging
APPLICATIONS
■ Battery Powered Systems ■ Cordless Telephones ■ Radio Control Systems ■ Portable/Palm Top/Notebook Computers ■ Portable Consumer Equipment ■ Portable Instrumentation ■ Avionics ■ SMPS Post-Regulator ■ Voltage Reference ■ Automotive Electronics
DESCRIPTION
The SPX2950 and SPX2951 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 SPX2950 and SPX2951 feature low quiescent current and low dropout voltage (typ. 20mV at 100µA and 300mV at 150mA). This includes a tight initial tolerance of (0.5% for SPX2950A/SPX2951A), extremely good load and line regulation (0.05% typ.), and very low output temperature coefficient (20ppm/ °C typ.), making the SPX2950/SPX2951 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 voltage. The logic compatible shutdown feature enables the regulator to be switched ON and OFF. The SPX2950 is offered in a 3-pin TO-92 package compatible with other 5.0V, 3.3V regulators. The SPX2951 is availiable in an 8-lead SOIC package.
UNREGULATED DC +
7 FEEDBACK
8 INPUT
1 OUTPUT
FROM CMOS OR TTL
3 SHUTDOWN
+ _
ERROR AMPLIFIER
180kΩ
60 mV +
+
60kΩ
_ ERROR DETECTION
+ 1.23V
COMPARATOR
REFERENCE
2 SENSE
6 5V TAP
5 ______ ERROR
4 GROUND
5V
330kΩ +
1µF . . TO CMOS OR TTL
Block Diagram of SPX2951, 8 Lead 5V Version
DATE: 12/01/04
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
1
©Copyright 2004 Sipex Corporation
ABSOLUTE MAXIMUM RATINGS
Power Dissipation ........................................................ Internally Limited Lead Temp. (Soldering, 5 Seconds) ............................................. 260°C Storage Temperature Range ........................................ -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 Output .............................................. -0.3V to +30V ESD Rating ............................................................................ 2kV Min
ELECTRICAL CHARACTERISTICS
Electrical characteristics at VIN = VO+1V, IL=100µA, CL=1µF (note 2) TA=25°C, unless otherwise specified. Boldface applies over the full operating temperature range.
PARAMETER
CONDITIONS
MIN TYP MAX
SPX2950AC
SPX2951AC
3.3V Version
Output Voltage
TJ=25°C
3.284
-25°C≤TJ≤85°C
3.267
Full Operating Temperature 3.260
3.3 3.317 3.3 3.333 3.3 3.340
Output Voltage 5.0V Version
100µA≤ IL ≤150mA TJ≤TJMAX
3.254 3.3 3.346
Output Voltage
TJ=25°C
4.975
-25°C≤TJ≤85°C
4.950
Full Operating Temperature 4.940
5.0 5.025 5.0 5.050 5.0 5.060
Output Voltage All Voltage Options
100µA≤IL≤150mA TJ≤TJMAX
4.925 5.0 5.075
Output Voltage
(Note1)
20 100
Temperature Coefficient
Line Regulation (Note 3) VO+1V ≤ VIN ≤ 30V (Note 4) Load Regulation (Note 3) 100µA≤IL≤150mA
0.03 0.1 0.04 0.1
Dropout Voltage (Note5)
Ground Current
Current Limit Thermal Regulation
IL=100µA IL=100mA IL=150mA
IL=100µA IL=100mA IL=150mA
VOUT=0
20 80 270 450 300 500 150 170 36 58 230 0.05 0.2
Output Noise, 10Hz to 100kHz
CL=1µF CL=200µF CL=3.3µF, Bypass=0.01µF from pin 7 to pin1 (SPX2951)
430 160 100
8-Pin Version only
SPX2951AC
Reference Voltage
1.220 1.235 1.250
Reference Voltage
Over Temperature (Note 6) 1.190
1.270
Feedback Pin Bias Current
40 60
Reference Voltage
20
Temperature Coefficient
Feedback Pin Bias Current
0.1
Temperature Coefficient
MIN TYP MAX SPX2950C SPX2951C
UNITS
3.267 3.3 3.333 3.251 3.3 3.350 3.324 3.3 3.366
3.221 3.3 3.379
V V
4.950 5.0 5.050 4.925 5.0 5.075 4.900 5.0 5.100
4.880 5.0 5.120
V V
50 150 ppm/°C
0.04 0.2
%
0.1 0.2
%
20 80 mV 270 450 mV
300 500 mV
150 170
µA
3 6 mA
5 8 mA
230 mA
0.05 0.2 %/W
430 µVrms 160 µVrms 100 µVrms
SPX2951C
1.210 1.235 1.260
1.185
1.285
40 60
50
V .