SPX2951ACS-L-5-0

SPX2950/SPX2951 ® 150mA Low Dropout Voltage Regulator 8-Pin Surface Mount (S) FEATURES TO-92 (N) 2 1 ■ ■ ■ ■ ■ ■ ■ ■ ■ 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 OUTPUT 1 8 INPUT SENSE 2 7 FEEDBACK SHUTDOWN 3 6 5V or 3.3V Output GROUND 4 5 ERROR V 3 VIN OUT GROUND SPX2950 Bottom View SPX2951 Top View Now Available in Lead Free Packaging APPLICATIONS ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ SPX2951 versions only ■ Error Flag Warns of Output Dropout ■ Logic-Controlled Electronic Shutdown ■ Output Programmable From 1.24 to 29V 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 5V 8 1 INPUT OUTPUT 7 + FEEDBACK 2 SENSE + _ FROM CMOS OR TTL 3 180kΩ 6 ERROR AMPLIFIER 330kΩ 5V TAP SHUTDOWN + 60kΩ 60 mV + ______ + _ + 1.23V 5 ERROR DETECTION COMPARATOR ERROR 1µF . . TO CMOS OR TTL 4 REFERENCE GROUND 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 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 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 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 MIN SPX2950AC SPX2951AC TYP MAX UNITS SPX2950C SPX2951C 3.3V Version Output Voltage TJ=25°C -25°C≤TJ≤85°C Full Operating Temperature 3.284 3.267 3.260 3.3 3.3 3.3 3.317 3.333 3.340 3.267 3.251 3.324 3.3 3.3 3.3 3.333 3.350 3.366 V Output Voltage 100µA≤ IL ≤150mA TJ≤TJMAX 3.254 3.3 3.346 3.221 3.3 3.379 V Output Voltage TJ=25°C -25°C≤TJ≤85°C Full Operating Temperature 4.975 4.950 4.940 5.0 5.0 5.0 5.025 5.050 5.060 4.950 4.925 4.900 5.0 5.0 5.0 5.050 5.075 5.100 V Output Voltage 100µA≤IL≤150mA TJ≤TJMAX 4.925 5.0 5.075 4.880 5.0 5.120 V 20 100 50 150 ppm/°C % 5.0V Version All Voltage Options Output Voltage Temperature Coefficient (Note1) Line Regulation (Note 3) VO+1V ≤ VIN ≤ 30V (Note 4) 0.03 0.1 0.04 0.2 Load Regulation (Note 3) 100µA≤IL≤150mA 0.04 0.1 0.1 0.2 % Dropout Voltage (Note5) IL=100µA IL=100mA IL=150mA 20 270 300 80 450 500 20 270 300 80 450 500 mV mV mV Ground Current IL=100µA IL=100mA IL=150mA 150 3 5 170 6 8 150 3 5 170 6 8 µA mA mA Current Limit VOUT=0 0.2 0.05 0.2 %/W 230 Thermal Regulation 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 1.220 Over Temperature (Note 6) 1.235 1.190 mA 430 160 100 SPX2951AC Reference Voltage Reference Voltage 230 0.05 µVrms µVrms µVrms SPX2951C 1.250 1.210 1.270 1.185 V 1.285 V 60 nA 40 Reference Voltage Temperature Coefficient 20 50 ppm/°C Feedback Pin Bias Current Temperature Coefficient 0.1 0.1 nA/°C SPX2950/SPX2951 150mA Low Dropout Voltage Regulator 2 40 1.260 Feedback Pin Bias Current DATE: 12/01/04 60 1.235 ©Copyright 2004 Sipex Corporation ELECTRICAL CHARACTERISTICS: Continued 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 MIN TYP MAX UNITS Error Comparator Output Leakage Current V0H=30V 0.01 1 0.01 1 µA Output Low Voltage VIN=VO-0.5V I0L=400µA 150 250 150 250 mV Upper Threshold Voltage (Note 7) 40 60 Lower Threshold Voltage (Note 7) 75 Hysteresis 15 (Note 7) 40 95 60 75 mV 95 15 mV mV Shutdown Input Input Logic Voltage Low (Regulator ON) High (Regulator OFF) 1.3 0.7 2.0 1.3 0.7 V V 2.0 Shutdown Pin Input Current VS=2.4V VS=30V 30 400 50 800 30 400 50 800 µA µA Regulator Output Current (Note 8) in Shutdown 3 10 3 10 µA Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range. Note 2: Unless otherwise specified all limits are guaranteed for TJ = 25°C, VIN = VO +1V, IL = 100µA and CL = 1µF. Additional conditions for the 8-pin versions are feedback tied to 5V tap and output tied to output sense (VOUT = 5V) and VSHUTDOWN ≤ 0.8V. Note 3: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specification for thermal regulation. Note 4: Line regulation for the SPX2951 is tested at IL = 1mA. See typical performance characteristics for line regulation versus temperature and load current. Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value measured at 1V differential. At very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V over temperature) must be taken into account. Note 6: VREF≤VOUT≤(VIN -1V),2.3≤VIN≤30V, 100µA≤IL≤150mA, TJ≤TJMAX. Note 7: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at 6V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = VOUT/VREF= (R1 + R2)/R2. For example, at a programmed output voltage of 5V, the error output is guaranteed to go low when the output drops by 95mV x 5V/1.235 = 384mV. Thresholds remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed. Note 8: VSHUTDOWN ≥ 2V, VIN ≤ 30V, VOUT = 0, Feedback pin tied to 5V/ 3.3V tap. DATE: 12/01/04 SPX2950/SPX2951 150mA Low Dropout Voltage Regulator 3 ©Copyright 2004 Sipex Corporation TYPICAL PREFORMANCE CHARACTERISTICS 10 250 6 225 R L =50kΩ 3 R L =50kΩ 2 R L = 50kΩ 175 150 125 100 RL = 8 4 GROUND PIN CURRENT (mA) 200 INPUT CURRENT (µA) OUTPUT VOLTAGE (VOLTS) 5 75 50 1 1 0.1 25 0 0 1 2 3 4 5 1 0 6 2 320 240 INPUT CURRENT (mA) GROUND CURRENT (µA) 280 I L = 1mA 200 160 IL= 0 120 80 40 1 2 3 5 6 7 8 4 5 0.01 0.1 9 10 6 7 8 100 6 R L =50 Ω VOUT = 5V 5 V IN = 6V I L = 100mA 4 3 0 1 2 3 4 5 6 7 8 -75 -50 -25 9 10 0 25 50 75 100 125 150 TEMPERATURE (ºC) INPUT VOLTAGE (VOLTS) Ground Current 10 Quiescent Current 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 INPUT VOLTAGE (VOLTS) 1 LOAD CURRENT (mA) Input Current Dropout Characteristics 0 4 INPUT VOLTAGE (VOLTS) INPUT VOLTAGE (VOLTS) 0 3 GROUND CURRENT (mA) 0 Ground Current Input Current 190 8 6 QUIESCENT CURRENT (µA) GROUND CURRENT (mA) 7 I L =100mA 5 4 3 2 1 170 V IN =6V I L =100uA 150 130 0 0 1 2 3 4 5 6 7 -75 -50 -25 8 Ground Current DATE: 12/01/04 0 25 50 75 100 125 150 TEMPERATURE (ºC) INPUT VOLTAGE Quiescent Current SPX2950/SPX2951 150mA Low Dropout Voltage Regulator 4 ©Copyright 2004 Sipex Corporation TYPICAL PREFORMANCE CHARACTERISTICS 500 500 240 I L = 150mA 230 300 200 ~ ~ 40 20 I L = 100µA SHORT CIRCUIT CURRENT (mA) 400 DROP-OUT VOLTAGE (mV) 300 200 TJ = 25ºC 100 0 0 -75 -50 -25 0 25 50 100µA 75 100 125 150 1mA TEMPERATURE (ºC) 10mA 210 200 190 180 170 -75 -50 -25 100mA OUTPUT CURRENT Drop-Out Voltage 2.5 50 mV SINK CURRENT (mA) 2.0 HYSTERESIS 2 0 1.5 T A = 25ºC 1.0 T A = -55ºC 0.5 0.0 0 1 2 3 4 5 0 8V 4V 0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 INPUT VOLTAGE (V) C L = 1µF I L = 1mA V OUT = 5V -50 mV ~ ~ 6V PULLUP RESISTOR TO SEPARATE 5V SUPPLY -2 200 OUTPUT LOW VOLTAGE (V) Error Comparator Output 400 600 800 TIME(µs) SPX2951 Comparator Sink Current 10 75 100 125 150 100 mV T A = 125ºC 4 25 50 Short Circuit Current V OUT = 5V 6 0 TEMPERATURE (ºC) Drop-Out Voltage 8 COMPARATOR OUTPUT (V) 220 INPUT OUTPUT VOLTAGE VOLTAGE CHANGE DROP-OUT VOLTAGE (mV) 400 Line Transient Response 90 90 80 80 70 70 I O = 1mA 2 I O = 100mA 1 0.5 V OUT = 5V C L = 1µF 0.2 0.1 0.05 IL = 0 60 50 40 I L = 100µA C L = 1µF V IN = 6V V OUT = 5V 30 0.02 RIPPLE REJECTION (dB) 5 RIPPLE REJECTION (dB) OUTPUT IMPEDANCE (OHMS) IO = 100µA 10 100 1K 10K FREQUENCY (Hz) Output Impedance DATE: 12/01/04 100K 1M 60 50 40 30 20 0.01 C L = 1µF V IN = 6V V OUT = 5V I L = 1mA I L = 10mA 20 10 1 10 2 10 3 10 4 10 5 10 1 10 6 FREQUENCY (Hz) Ripple Rejection 10 2 10 3 10 4 10 5 10 6 FREQUENCY (Hz) Ripple Rejection SPX2950/SPX2951 150mA Low Dropout Voltage Regulator 5 ©Copyright 2004 Sipex Corporation TYPICAL PREFORMANCE CHARACTERISTICS 20 50 1.9 FEEDBACK CURRENT (µA) 2.1 0 -10 -20 0 -50 -25 25 -75 -50 -25 75 100 125 150 50 0 25 50 -2.0 6 150 40 100 20 0 -50 C L = 1µF V OUT = 5V 100 mA SHUTDOWN OUTPUT PINOUT VOLTAGE (V) VOLTAGE (V) 7 60 50 0 -20 C L = 10µF V OUT = 5V -40 -60 ~ ~ 100 µA 100 100 µA µA 2 3 4 5 0 4 8 12 16 40 T A =25 ºC T A = 85 ºC 5 10 15 20 INPUT VOLTAGE (V) SPX2950 Maxium Rated Output DATE: 12/01/04 25 I L = 10mA V IN = 8V V OUT = 5V 1 C L = 10µF 0 2 0 0 100 200 300 400 500 600 700 Enable Transient 120 100 30 DIP SOLDERED TO PC BOARD T JMAX = 125º C V OUT = 5V 300 200 100 80 60 T A = 25ºC 40 T A = 50ºC 20 0 0 0 2 TIME (us) OUTPUT CURRENT (mA) PIN 2 TO PIN 4 RESISTANCE (kΩ) T JMAX = 125 ºC 20 3 8-PIN MOLDED Vout=5V 60 1.0 4 -100 400 TO-92 PACKAGE 0.25" LEADS SOLDERED TO PC BOARD 80 0.5 5 20 Load Transient Response 120 0 C L = 1µF TIME (ms) Load Transient Response -0.5 -2 TIME (ms) 100 -1.0 SPX2951 Feedback Pin Current 80 1 -1.5 FEEDBACK VOLTAGE (V) 200 0 T A = 55ºC -200 250 ~ ~ T A = 25ºC -150 75 100 125 150 SPX2951 Feedback Bias Current LOAD OUTPUT VOLTAGE CURRENT CHANGE (mV) LOAD OUTPUT VOLTAGE CURRENT CHANGE (mV) SPX2951 Minimum Operating Voltage -100 TA=1 25ºC -100 TEMPEATURE (ºC) TEMPERATURE OUTPUT CURRENT (mA) -50 -250 -30 1.7 -75 PIN 7 DRIVEN BY EXTERNAL SOURCE (REGULATOR RUN OPEN LOOP) 0 10 BIAS CURRENT (nA) MINIMUM OPERATING VOLTAGE (V) 2.3 -75 T A = 85ºC 0 -50 -25 0 25 50 75 100 125 150 0 TEMPERATURE (ºC) SPX2951 Divider Resistance 10 15 20 25 30 INPUT VOLTAGE (V) SPX2950 Maxium Rated Output Current SPX2950/SPX2951 150mA Low Dropout Voltage Regulator 6 5 ©Copyright 2004 Sipex Corporation TYPICAL PREFORMANCE CHARACTERISTICS 1.8 5 3.5 1.6 4 3.0 2 2.5 0 2.0 -2 1.5 I L = 100mA 1.4 C L = 1µF C L = 220µF C L = 3.3µF C BYP = 0.1µF 1.2 ~~ 1.0 1.0 1 1.25W 0.8 0.5 0 0.0 -1 0.6 -75 -50 -25 0 25 50 10 0 75 100 125 150 20 30 40 50 10 2 TIME (µs) TEMPERATURE (ºC) Shutdown Threshold Voltage 10 3 10 4 10 5 FREQUENCY (Hz), C BYP =0.1uF Thermal Response Output Noise 80 30 I L = 50mA 25 20 70 I L = 100µA 15 10 5 60 T J = 150 ºC I L = 1mA I L = 100mA 50 0 40 ~~ 10 C L = 1µF VIN = 6V VOUT = 5V 30 T J = 125 ºC 5 0 -5 I L = 100µA 20 10 -10 5 10 15 20 25 30 10 1 10 2 INPUT VOLTAGE (V) Line Regulation DATE: 12/01/04 10 3 10 4 10 5 10 6 FREQUENCY (Hz) Ripple Rejection SPX2950/SPX2951 150mA Low Dropout Voltage Regulator 7 ©Copyright 2004 Sipex Corporation APPLICATION HINTS EXTERNAL CAPACITORS The stability of the SPX2950/SPX2951 requires a 1µF or greater capacitor between output and ground. Oscillation could occur without this capacitor. Most types of tantalum or aluminum electrolytic works fine here. For operations below -25°C solid tantalum is recommended since the many aluminum types have electrolytes that freeze at about -30°C. The ESR of about 5Ω or less and resonant frequency above 500kHz are the most important parameters in the value of the capacitor. The capacitors value may be increased without limit. 4.75V OUTPUT VOLTAGE _______ ERROR* +5.0V INPUT VOLTAGE At lower values of output current, less output capacitance is required for stability. For the currents below 10mA the value of the capacitor can be reduced to 0.33µF and 0.1µF for 1mA. More output capacitance is needed for the 8-pin version at voltages below 5V since it runs the error amplifier at lower gain. At worst case 3.3µF or greater must be used for the condition of 150mA load at 1.23V output. + * See Application Info. Fig. 1 ERROR Output Timing ERROR DETECTION COMPARATOR OUTPUT The comparator produces a logic low output whenever the SPX2951 output falls out of regulation by more than around 5%. This is around 60mV offset divided by the 1.235 reference voltage. This trip level remains 5% below normal regardless of the programmed output voltage of the regulator. The SPX2950/51 unlike other low dropout regulators will remain stable and in regulation with no load in addition to the internal voltage divider. This feature is especially important in applications like CMOS RAM keep-alive. When setting the output voltage of the SPX2950/51 version with external resistors, a minimum load of 1µA is recommended Figure 1 shows the timing diagram depicting the ERROR signal and the regulator output voltage as the SPX2951 input is ramped up and down. The ERROR signal becomes low at around 1.3V input, and goes high around 5V input (input voltage at which VOUT = 4.75). Since the SPX2951’s dropout voltage is load dependent, the input voltage trip point (around 5V) will vary with the load current. The output voltage trip point (approx. 4.75V) does not vary with load. If there is more than 10 inches of wire between the input and the AC filter capacitor or if a battery is used as the input then a 1µF tantalum or aluminum electrolytic capacitor should be placed from the input to the ground. Instability can occur if there is stray capacitance to the SPX2951 feedback terminal (pin 7). This could cause more problems when using a higher value of external resistors to set the output voltage. This problem can be fixed by adding a 100pF capacitor between output and feedback and increasing the output capacitor to at least 3.3µF. DATE: 12/01/04 +1.3V + The error comparator has an open-collector output, which requires an external pull-up resistor. Depending on the system requirements the resistor may be returned to 5V output or other supply voltage. In determining the value of this resistor, note that the output is rated to sink 400µA, this value adds to battery drain in a low battery condition. Suggested values range from 100K to 1MΩ. If the output is unused this resistor is not required. SPX2950/SPX2951 150mA Low Dropout Voltage Regulator 8 ©Copyright 2004 Sipex Corporation PROGRAMMING THE OUTPUT VOLTAGE OF SPX2951 The SPX2951 may be pin-strapped for 5V using its internal voltage divider by tying Pin 1 (output) to Pin 2 (sense) and Pin 7 (feedback) to Pin 6 (5V Tap). Also, it may be programmed for any output voltage between its 1.235V reference and its 29V maximum rating . As seen in Figure 2, an external pair of resistors is required. Refer to the below equation for the programming of the output voltage: REDUCING OUTPUT NOISE It may be an advantage to reduce the AC noise present at the output. One way is to reduce the regulator bandwidth by increasing the size of the output capacitor. This is the only way that noise can be reduced on the 3 lead SPX2950 but is relatively inefficient, as increasing the capacitor from 1µF to 220µF only decreases the noise from 430µV to 160µVRMS for a 100kHz bandwidth at 5V output. Noise could also be reduced fourfold by a bypass capacitor across R1, since it reduces the high frequency gain from 4 to unity. Pick VOUT = VREF × (1 + R1/R2)+ IFBR1 The VREF is 1.235 and IFB is the feedback bias current, nominally -20nA. The minimum recommended load current of 1 µA forces an upper limit of 1.2MΩ on value of R2. If no load is presented the IFB produces an error of typically 2% in VOUT which may be eliminated at room temperature by trimming R1. To improve the accuracy choose the value of R2 = 100k this reduces the error by 0.17% and increases the resistor program current by 12µA. Since the SPX2951 typically draws 60µA at no load with Pin 2 open-circuited this is a small price to pay. CBYPASS ≅ (1 / 2πR1 × 200 Hz) or choose 0.01µF. When doing this, the output capacitor must be increased to 3.3µF to maintain stability. These changes reduce the output noise from 430µV to 100µVRMS for a 100kHz bandwidth at 5V output. With the bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic at higher output voltages. TYPICAL APPLICATIONS +V IN 100K 8 5 ERROR OUTPUT +V IN ______ ERROR V OUT 1.24 to 29V 1 SPX2951 SHUTDOWN INPUT + R1 3 SD FB GND 3.3µF .01µF 7 4 1.23V V REF R2 Figure 2. Adjustable Regulator DATE: 12/01/04 SPX2950/SPX2951 150mA Low Dropout Voltage Regulator 9 ©Copyright 2004 Sipex Corporation TYPICAL APPLICATIONS: (Continued) +V IN 470KΩ +V IN 8 8 5 +V IN ______ ERROR ERROR V OUT 470kΩ V OUT 1 5 OUTPUT SPX2951 + 3 R1 SD FB SHUTDOWN 1µF 4 7 120kΩ SD FB GND 7 4 *MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40mV to 400mV. DEPENDING ON LOAD CURRENT. Figure 4. Wide Input Voltage Range Current Limiter Figure 3. Latch Off When Error Flag Occurs 6V SEALED LEADACID BATTERY SOURCE 3 INPUT GND R2 + 1.5kΩ 8 1N457 +V IN FB SPX385 V OUT 1 MAIN V+ SPX2951 FOR 5.5 V *V OUT = V IN 1 V OUT SPX2951 RESET +V IN ______ ERROR MEMORY V+ SENSE 400kΩ 2 3 1µF SD 100kΩ + GND 4 20kΩ NI-CAD BACKUP BATTERY Figure 5.Low Battery Disconnect DATE: 12/01/04 SPX2950/SPX2951 150mA Low Dropout Voltage Regulator 10 ©Copyright 2004 Sipex Corporation TYPICAL APPLICATIONS: (Continued) 39kΩ 8 5 +VIN ERROR RESET 2 SENSE VOUT +VOUT=5V 1 + SPX2951 C4 + 3 SD 39kΩ 1µF FB GND TAP 4 6 7 100kΩ 1% C1 + 100kΩ C2 + 100kΩ