SPX2920 ® 400mA Low Drop Out Voltage Regulator with Shutdown FEATURES 8 +VIN ■ Output 3.3V, 5.0V, at 400mA Output 1.2V to 20V 1 +VIN VOUT + 100K ■ Very Low Quiescent Current SPX2920 ■ Low Dropout Voltage SHUTDOWN INPUT ■ Extremely Tight Load And Line Regulation 3 VREF 4 ON 0.01µF 10µF ERROR 5 GND OFF ■ Very Low Temperature Coefficient 7 FB ______ ERROR SD R1 OUTPUT R2 ■ Current & Thermal Limiting Adjustable Regulator ■ Error Flag Warns Of Output Dropout (for SO-8) ■ Logic-Controlled Electronic Shutdown (for SO-8) 5V VIN OUT IN SPX2920 ■ Output Programmable From 1.24V to 20V (for SO-8) + + 0.1 µF 2.2 µF GND ■ Equivalent Replacement for MIC2920A and MIC2904 IG 5V Regulator Circuit DESCRIPTION The SPX2920 is a low power voltage regulator. This device is an excellent choice for use in battery-powered applications such as cordless telephones, radio control systems, and portable computers. The SPX2920 features very low quiescent current (140µA Typ.) and very low dropout voltage. This includes a tight initial tolerance of 1% max and very low output temperature coefficient, making the SPX2920 useful as a lowpower voltage reference. The error flag output feature is used as power-on reset for warning of a low output voltage, due to a falling voltage input of batteries. Another feature is the logic-compatible shutdown input which enables the regulator to be switched on and off. The SPX2920 is offered in 3-pin TO-220 package, SO-8 (same pin out as SPX2951), SOT-223, and surface mount and 3-pin TO-263 packages. The regulator output voltage (of the SO-8) may be pin-strapped for a 3.3V and 5.0V or programmed from 1.24V to 20V with an external pair of resistors. TO-220-3 (U) SPX2920 SPX2920 1 2 8-Pin Surface Mount TO-263-3 (T) 1 2 3 SOT-223 (M3) VOUT 1 8 VIN SENSE 2 7 FEEDBACK SHUTDOWN 3 SPX2920 VIN GND 4 5 2 3 5V/ 3.3V TAP 3 GND SPX2920 1 6 ERROR VIN GND VOUT VOUT VIN GND VOUT Front View Rev: A Date: 03/30/04 Top View Top View SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 1 Top View ©Copyright 2004 Sipex Corporation ABSOLUTE MAXIMUM RATINGS Feedback Input Voltage .................................................... -1.5V to +20V Shutdown Input Voltage .................................................... -0.3V to +20V Error Comparator Output .................................................. -0.3V to +20V ESD Rating ....................................................................................... 2kV 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 ......................................................... -20V to +20V ELECTRICAL CHARACTERISTICS Electrical characteristics at VIN =VO +1V, IO = 1mA, COUT = 2.2µF, TA = 25°C, unless otherwise specified. Boldface applies over the full operating temperature range. PARAMETER CONDITIONS (Note 2) TYP MIN MAX UNITS 3.3 3.3 3.267 3.217 3.333 3.382 V 1mA ≤ IL ≤ 400mA 5.0 5.0 4.950 4.880 5.050 5.120 V 1mA ≤ IL ≤ 400mA 20 100 ppm/°C 3.3V Version Output Voltage 5.0V Version Output Voltage All Voltage Options Output Voltage Temperature Coefficient (Note1) Line Regulation (Note 4) 6V ≤ VIN ≤ 20V 1.5 20 mV Load Regulation (Note 3) IL=1 to 400mA 5 20 30 mV Dropout Voltage (Note5) IL=1mA 60 mV IL=400mA 370 100 150 400 500 IL=1mA 140 200 300 µA IL=100mA 1.3 2 2.5 mA IL=250mA 3.4 9 12 mA IL=400mA 6 15 25 mA Ground Current Current Limit VOUT=0 Thermal Regulation 0.05 Output Noise, 10Hz to 100kHz IL=100mA CL=10µF CL=100µF 800 mA 0.2 %/W 400 260 µV Vrms Adjustable 8-Pin Version only Reference Voltage 1.235 Reference Voltage Over Temperature Feedback Pin Bias Current 20 Reference Voltage Temperature Coefficient 20 Rev:A Date: 03/30/04 1.210 1.260 V 1.185 1.285 V 40 60 nA SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 2 ppm/°C ©Copyright 2004 Sipex Corporation ELECTRICAL CHARACTERISTICS Electrical characteristics at VIN = VO+1V, IO = 1mA, COUT = 2.2µF, TA = 25°C, unless otherwise specified. Boldface applies over the full operating temperature range. PARAMETER CONDITIONS (Note 2) TYP Feedback Pin Bias Current Temperature Coefficient MIN MAX 0.1 UNITS nA/°C Error Comparator Output Leakage Current V0UT=20V 0.01 1 2 µA Output Low Voltage VIN=4.5V IOUT=400µA 150 250 400 mV Upper Threshold Voltage (Note 6) 60 Lower Threshold Voltage (Note 6) 75 Hysteresis (Note 6) 15 40 25 mV 95 140 mV mV Shutdown Input Input Logic Voltage 1.3 Low (Regulator ON) High (Regulator OFF) Shutdown Pin Input Current Regulator Output Current in Shutdown 0.7 V 50 100 600 750 µA 2.0 VS=2.4V 30 VS=20V 450 (Note 7) 3 10 20 µA Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range. Note 2: Additional conditions for the 8-pin versions are feedback tied to 5V/3.3V 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 SPX2920 is tested at 150°C for IL = 1 mA. For TJ = 125°C, line regulation is guaranteed by design. Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV 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: 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 95 mV x 5V/1.235 = 384 mV. 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 7: VSHUTDOWN ≥ 2V, VIN ≤ 20V, VOUT = 0, Feedback pin tied to 5V/3.3V Tap. Rev: A Date: 03/30/04 SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 3 ©Copyright 2004 Sipex Corporation BLOCK DIAGRAM UNREGULATED DC 7 + 5V @ 400mA MAX 1 8 2 180k Ω .. + _ FROM TTL 6 ERROR AMPLIFIER 3 330k Ω .. 60kΩ .. + 60 mV + 5 + _ ERROR DETECTION COMPARATOR + 1.23V 1 uF TO CMOS OR TTL 4 REFERENCE SPX2920-5.0 Block Diagram APPLICATION HINTS External Capacitors The stability of the SPX2920 requires a 2.2µF 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 of 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 capacitor value can be increased without limit. The SPX2920, 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. 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 0.1µF tantalum or aluminum electrolytic capacitor should be placed from the input to the ground. Instability can occur if there is stray capacitance to the SPX2920 feedback terminal (pin 7). This could cause more problems when using a higher value of external resistors to set the output 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 0.5µF and 0.15µF for 1mA. More output capacitance needed for the 8-pin version at voltages below 5V since it runs the error amplifier at lower gain. At worst case 4.7µF or greater must be used for the condition of 250mA load at 1.23V output. Rev:A Date: 03/30/04 This problem can be fixed by adding a 100pF capacitor between output and feedback and increasing the output capacitor to at least 3.3µF. SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 4 ©Copyright 2004 Sipex Corporation Error Detection Comparator Output The Comparator produces a logic low output whenever the SPX2920 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. Figure 1 shows the timing diagram depicting the ERROR signal and the regulator output voltage as the SPX2920 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 SPX2920’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. 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 SPX2920 typically draws 60 µA at no load with Pin 2 open-circuited this is a small price to pay. 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. Noise could also be reduced fourfold by a bypass capacitor across R1, since it reduces the high frequency gain from 4 to unity. Pick 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 SPX2920 but is relatively inefficient, as increasing the capacitor from 1µF to 220µF only decreases the noise from 430µV to 160µV Vrms for a 100kHz bandwidth at 5V output. CBYPASS ≅1 / 2πR1 x 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 100µV Vrms 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. Programming the Output Voltage of SPX2920 The SPX2920 may be pin-strapped for 5V or 3.3V using its internal voltage divider by tying Pin 1 (output) to Pin 2 (sense) and Pin 7 (feedback) to Pin 6 (5V/3.3V Tap). 4.75V Also, it may be programmed for any output voltage between its 1.235V reference and its 20V maximum rating. As seen on the front page, an external pair of resistors is required. Refer to the below equation for the programming of the output voltage:: OUTPUT VOLTAGE _______ ERROR* VOUT = VREF x ( 1 + R1/ R2 )+ IFBR1 +5.0V INPUT VOLTAGE The VREF is 1.235 and IFB is the feedback bias current, nominally -20nA. The minimum recommended load current of 1µA forces an upper limit of 1.2MΩ on value of R2. If no load is presented the IFB produces an error of typically Rev: A Date: 03/30/04 + +1.3V + * See Application Info. Figure 1. ERROR Output Timing SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 5 ©Copyright 2004 Sipex Corporation PACKAGE: 3 PIN TO-220 A E E/2 E2 SEATING PLANE A A1 Q H1 D D1 CHAMFER OPTIONAL L1 1 C 2 3 C D D C SEE DETAIL B L A 2X e 3X b C e1 3 PIN TO-220 JEDEC TO-220 (AB) Variation A2 Dimensions in (mm) MIN A 4.06 - 4.83 b 0.63 - 1.04 C1 0.36 D 14.22 E 9.78 e 1.57 e3 0.76 F .14 THERMAL PAD (E) NOM MAX - (H1) 0.56 D2 14.99 - (DATUM A) 10.54 - 1.53 - 1.02 E1 - 1.40 H1 5.94 J1 2.29 - 2.92 øP Q 3.71 2.62 - 3.96 2.87 L 13.72 ø U V - 6.55 - 14.22 7 7.62 REF 3 6.10 REF c b Rev:A Date: 03/30/04 SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 6 ©Copyright 2004 Sipex Corporation PACKAGE: 3 PIN TO-263 0.405 ± 0.005 (10.287 ± 0.127) 0.176 ± 0.005 (4.470 0.050 ± 0.002 (1.270 0.055 (1.397) 0.356 (9.042 ± ± ± ± 0.127) 0.051) 0.005 0.127) 0.600 ± 0.025 (15.24 ± 0.635) 0.100 ± 0.010 (2.540 ± 0.254) 0.103 BSC (2.616) Rev: A Date: 03/30/04 0.015 (0.381 0.050 (1.270) 0.032 +- 0.001 (0.813 +- 0.025) ++ - 0.003 0.074) 0° 8° SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 7 ©Copyright 2004 Sipex Corporation PACKAGE: 3 PIN SOT-223 C D C C N See detail A E E1 B A 1 A1 H e B Dimensions in (mm) GAUGE PLANE A - - 1.80 A1 0.02 - 0.10 1.60 1.70 A2 1.50 0.76 0.84 b1 0.60 0.71 0.79 b2 2.90 3.00 3.10 b 0.66 b3 2.84 2.95 3.05 c 0.23 0.30 0.35 0.28 0.33 6.50 6.70 c1 0.23 D 6.30 E 6.70 7.00 7.30 E1 3.30 3.50 3.70 e N ø Rev:A Date: 03/30/04 L 0 C 2.30 BASIC e1 L SEATING PLANE 3 PIN SOT-223 JEDEC TO-261 (AA) Variation MIN NOM MAX 4.60 BASIC 0.75 - - - 5 - 0º - 10º 3 PIN SOT-223 SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 8 ©Copyright 2004 Sipex Corporation PACKAGE: 8 PIN NSOIC D e E/2 E1 E SEE VIEW C E1/2 1 b INDEX AREA (D/2 X E1/2) Ø1 A TOP VIEW Gauge Plane L2 Seating Plane Ø1 Ø L L1 VIEW C A2 A SEATING PLANE A1 SIDE VIEW 8 Pin NSOIC (JEDEC MS-012, AA - VARIATION) b WITH PLATING DIMENSIONS Minimum/Maximum (mm) COMMON HEIGHT DIMENSION SYMBOL A A1 A2 b c D E E1 e L L1 L2 Ø Ø1 Rev: A Date: 03/30/04 MIN NOM MAX 1.75 1.35 0.25 0.10 1.25 1.65 0.31 0.51 0.17 0.25 4.90 BSC 6.00 BSC 3.90 BSC 1.27 BSC 0.40 1.27 1.04 REF 0.25 BSC 0º 8º 5º 15º c BASE METAL CONTACT AREA PACKAGE: 8 PIN NSOIC SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 9 ©Copyright 2004 Sipex Corporation ORDERING INFORMATION Ordering No. Accuracy Output Voltage Packages SPX2920M3-3.3 1% 3.3V 3-Pin SOT-223 SPX2920M3-5.0 1% 5.0V 3-Pin SOT-223 SPX2920S-3.3 1% 3.3V 8-Pin NSOIC SPX2920S-5.0 1% 5.0V 8-Pin NSOIC SPX2920T-3.3 1% 3.3V 3-Pin TO-263 SPX2920T-5.0 1% 5.0V 3-Pin TO-263 SPX2920U-3.3 1% 3.3V 3-Pin TO-220 SPX2920U-5.0 1% 5.0V 3-Pin TO-220 Corporation SIGNAL PROCESSING EXCELLENCE Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: [email protected] Rev:A Date: 03/30/04 SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown 10 ©Copyright 2004 Sipex Corporation