TPS76501-Q1 ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT VOLTAGE REGULATOR www.ti.com SLVS800 - DECEMBER 2007 FEATURES 1 * * * * * * * D PACKAGE (TOP VIEW) Qualified for Automotive Applications 150-mA Low-Dropout (LDO) Voltage Regulator Dropout Voltage to 85 mV (Typ) at 150 mA (TPS76550) Ultra-Low 35-A (Typ) Quiescent Current 3% Tolerance Over Specified Conditions for Fixed-Output Versions Open-Drain Power Good Output Thermal Shutdown Protection FB 1 8 OUT PG 2 7 OUT GND 3 6 IN EN 4 5 IN DESCRIPTION/ORDERING INFORMATION This device is designed to have an ultra-low quiescent current and be stable with a 4.7-F capacitor. This combination provides high performance at a reasonable cost. Because the PMOS device behaves as a low-value resistor, the dropout voltage is very low (typically 85 mV at an output current of 150 mA for the TPS76550) and is directly proportional to the output current. Additionally, since the PMOS pass element is a voltage-driven device, the quiescent current is very low and independent of output loading (typically 35 A over the full range of output current, 0 mA to 150 mA). These two key specifications yield a significant improvement in operating life for battery-powered systems. This LDO also features a sleep mode; applying a TTL high signal to EN (enable) shuts down the regulator, reducing the quiescent current to less than 1 A (typ). Power good (PG) is an active-high output, which can be used to implement a power-on reset or a low-battery indicator. TPS76533 TPS76533 DROPOUT VOLTAGE vs FREE-AIR TEMPERATURE GROUND CURRENT vs LOAD CURRENT 100 35.0 VO = 3.3 V TA = 25C 34.9 I GND - Ground Current - A V DO - Output Voltage - V VI = 3.2 V IO = 150 mA 10-1 IO = 50 mA IO = 10 mA 10-2 34.8 34.7 34.6 34.5 34.4 34.3 34.2 34.1 10-3 34.0 -50 -25 0 25 50 75 100 TA - Free-Air Temperature - C 125 150 0 25 50 75 100 125 150 IL - Load Current - mA 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright (c) 2007, Texas Instruments Incorporated TPS76501-Q1 ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT VOLTAGE REGULATOR www.ti.com SLVS800 - DECEMBER 2007 The TPS765xx is offered in 1.5-V, 1.8-V, 2.5-V, 2.7-V, 2.8-V, 3-V, 3.3-V and 5-V fixed-voltage versions and in an adjustable version (programmable over the range of 1.25 V to 5.5 V). Output voltage tolerance is specified as a maximum of 3% over line, load, and temperature ranges. The TPS765xx family is available in an 8-pin SOIC package. ORDERING INFORMATION (1) TA VO (TYP) -40C to 125C Adjustable (1) (2) PACKAGE (2) SOIC - D ORDERABLE PART NUMBER Reel of 2500 TPS76501QDRQ1 TOP-SIDE MARKING 76501Q For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. Package drawings, thermal data, and symbolization are available at www.ti.com/packaging. TPS765xx 5 VI IN PG 6 NC/FB IN OUT 0.1 F 4 EN OUT 2 PG 1 250 k 7 VO 8 + GND 3 CO 4.7 F 300 m Figure 1. Typical Application Configuration for Fixed Output Options FUNCTIONAL BLOCK DIAGRAM - ADJUSTABLE-VOLTAGE VERSION IN EN PG - + OUT + R1 - Vref = 1.224 V FB R2 GND 2 Submit Documentation Feedback External to the device Copyright (c) 2007, Texas Instruments Incorporated TPS76501-Q1 ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT VOLTAGE REGULATOR www.ti.com SLVS800 - DECEMBER 2007 FUNCTIONAL BLOCK DIAGRAM - FIXED-VOLTAGE VERSION IN EN PG _ + OUT + _ R1 Vref = 1.224 V R2 GND TERMINAL FUNCTIONS TERMINAL NAME NO. I/O DESCRIPTION EN 1 I Enable FB 2 I Feedback voltage GND 3 Regulator ground IN 4, 5 I Input voltage OUT 6, 7 O Regulated output voltage 8 O Power good output PG Copyright (c) 2007, Texas Instruments Incorporated Submit Documentation Feedback 3 TPS76501-Q1 ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT VOLTAGE REGULATOR www.ti.com SLVS800 - DECEMBER 2007 ABSOLUTE MAXIMUM RATINGS (1) (2) over operating free-air temperature range (unless otherwise noted) VALUE VI Input voltage range -0.3 V to 13.5 V Voltage range at EN -0.3 V to 16.5 V Maximum PG voltage 16.5 V IO Peak output current Internally limited PD Continuous total power dissipation VO Output voltage (OUT, FB) TJ Operating virtual junction temperature range -40C to 125C Tstg Storage temperature range -65C to 150C ESD Electrostatic discharge rating See Dissipation Ratings 7V Human-Body Model (1) (2) 2000 V Machine Model 200 V Charged-Device Model 1500 V Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltage values are with respect to network terminal ground. DISSIPATION RATINGS PACKAGE D AIR FLOW (CFM) POWER RATING TA < 25C DERATING FACTOR TA 25C POWER RATING TA = 70C POWER RATING TA = 85C 0 568 mW 5.68 mW/C 312 mW 227 mW 250 904 mW 9.04 mW/C 497 mW 361 mW RECOMMENDED OPERATING CONDITIONS MIN MAX VI Input voltage (1) 2.7 10 VO Output voltage 1.2 5.5 V IO Output current (2) 0 150 mA TJ Operating virtual junction temperature -40 125 C (1) (2) 4 UNIT V To calculate the minimum input voltage for your maximum output current, use the following equation: VI(min) = VO(max) + VDO(max load). Continuous current and operating junction temperature are limited by internal protection circuitry, but it is not recommended that the device operate under conditions beyond those specified in this table for extended periods of time. Submit Documentation Feedback Copyright (c) 2007, Texas Instruments Incorporated TPS76501-Q1 ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT VOLTAGE REGULATOR www.ti.com SLVS800 - DECEMBER 2007 ELECTRICAL CHARACTERISTICS VI = VO(typ) + 1 V, IO = 10 A, EN = 0 V, CO = 4.7 F (unless otherwise noted) PARAMETER TEST CONDITIONS TPS76501 5.5 V VO 1.25 V TPS76515 2.7 V < VIN < 10 V TPS76518 Output voltage (1) TJ 2.8 V < VIN < 10 V TPS76525 3.5 V < VIN < 10 V TPS76527 10-A to 150-mA load 3.7 V < VIN < 10 V TPS76528 3.8 V < VIN < 10 V TPS76530 4 V < VIN < 10 V TPS76533 4.3 V < VIN < 10 V TPS76550 6 V < VIN < 10 V 10 A < IO < 150 mA Quiescent current (GND current) (1) MIN 25C -40C to 125C MAX UNIT VO 0.97VO 25C -40C to 125C 1.5 25C -40C to 125C 1.746 2.425 2.7 2.884 3 2.910 3.090 3.3 3.201 25C -40C to 125C V 2.8 25C -40C to 125C 2.781 2.716 25C -40C to 125C 2.575 2.619 25C -40C to 125C 1.854 2.5 25C -40C to 125C 1.545 1.8 25C -40C to 125C 1.03VO 1.455 3.399 5 4.850 25C IO = 150 mA TYP 5.150 35 -40C to 125C 50 A Output voltage line regulation (1) (2) (VO/VO) VO + 1 V < VI 10 V 25C Load regulation IO = 10 A to 150 mA -40C to 125C 0.3 % Output noise voltage BW = 300 Hz to 50 kHz, CO = 4.7 F 25C 200 Vrms Output current limit VO = 0 V -40C to 125C 0.8 0.01 Thermal shutdown junction temperature 25C EN = VI, 2.7 V < VI < 10 V TPS76501 FB = 1.5 V -40C to 125C Low-level EN input voltage -40C to 125C PG f = 1 kHz, CO = 4.7 F, IO = 10 mA 2 A nA 2 V 0.8 V 25C 63 dB IO(PG) = 300 A -40C to 125C 1.1 V Trip threshold voltage VO decreasing -40C to 125C Hysteresis voltage Measured at VO -40C to 125C 0.5 Output low voltage VI = 2.7 V, IO(PG) = 1 mA -40C to 125C 0.15 Leakage current V(PG) = 5 V -40C to 125C Minimum input voltage for valid PG EN input current (1) (2) (1) 10 -40C to 125C A C 1 -40C to 125C High-level EN input voltage Power-supply ripple rejection 1.2 150 Standby current FB input current %/V EN = 0 V -40C to 125C EN = VI 92 -1 -1 98 0 %VO %VO 0.4 V 1 A 1 1 A Minimum IN operating voltage is 2.7 V or VO(typ) + 1 V, whichever is greater. Maximum IN voltage 10 V. If VO 1.8 V then VI(min) = 2.7 V, VI(max) = 10 V: Line Regulation (mV) + (%V) V O(VI(max) * 2.7 V) 100 1000 If VO 2.5 V then VI(min) = VO + 1 V, VI(max) = 10 V: Line Regulation (mV) + %V Copyright (c) 2007, Texas Instruments Incorporated V OVI(max) * VO ) 1 V 100 1000 Submit Documentation Feedback 5 TPS76501-Q1 ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT VOLTAGE REGULATOR www.ti.com SLVS800 - DECEMBER 2007 ELECTRICAL CHARACTERISTICS (continued) VI = VO(typ) + 1 V, IO = 10 A, EN = 0 V, CO = 4.7 F (unless otherwise noted) PARAMETER TEST CONDITIONS TPS76528 25C IO = 150 mA TPS76533 TPS76550 (3) 6 MIN TYP 330 280 140 -40C to 125C 25C -40C to 125C UNIT 160 -40C to 125C 25C MAX 190 -40C to 125C TPS76530 Dropout voltage (3) TJ 25C mV 240 85 150 IN voltage equals VO(typ) - 100 mV with output voltage set to 3.3 V nominal with external resistor divider. TPS76515, TPS76518, TPS76525, and TPS76527 dropout voltage limited by input voltage range limitations (i.e., TPS76530 input voltage must drop to 2.9 V for purpose of this test). Submit Documentation Feedback Copyright (c) 2007, Texas Instruments Incorporated www.ti.com TPS76501-Q1 ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT VOLTAGE REGULATOR SLVS800 - DECEMBER 2007 TYPICAL CHARACTERISTICS Table of Graphs FIGURE vs Load current 2, 3 vs Free-air temperature 4, 5 vs Load current 6, 7 vs Free-air temperature 8, 9 Power-supply ripple rejection vs Frequency 10 Output spectral noise density vs Frequency 11 Output impedance vs Frequency Dropout voltage vs Free-air temperature Output voltage Ground current Line transient response 15, 17 Load transient response 16, 18 Output voltage vs Time Dropout voltage vs Input voltage Equivalent series resistance (ESR) (1) vs Output current Equivalent series resistance (ESR) (1) vs Added ceramic capacitance (1) 12 13, 14 19 20 21 through 24 25, 26 Equivalent series resistance (ESR) refers to the total series resistance, including the ESR of the capacitor, any series resistance added externally, and PWB trace resistance to CO. Copyright (c) 2007, Texas Instruments Incorporated Submit Documentation Feedback 7 TPS76501-Q1 ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT VOLTAGE REGULATOR www.ti.com SLVS800 - DECEMBER 2007 TPS76533 TPS76515 OUTPUT VOLTAGE vs LOAD CURRENT OUTPUT VOLTAGE vs LOAD CURRENT 1.494 3.304 VI = 4.3 V TA = 25C 1.493 VO - Output Voltage - V 3.302 VO - Output Voltage - V VI = 2.7 V TA = 25C 3.300 3.298 3.296 3.294 1.492 1.491 1.490 1.489 1.488 3.292 1.487 0 25 50 75 100 125 150 0 25 50 75 100 IL - Load Current - mA Figure 2. TPS76533 IL - Load Current - mA Figure 3. TPS76515 OUTPUT VOLTAGE vs FREE-AIR TEMPERATURE OUTPUT VOLTAGE vs FREE-AIR TEMPERATURE 3.310 125 150 1.505 VI = 4.3 V 3.305 VI = 2.7 V IO = 10 A IO = 10 A 1.500 VO - Output Voltage - V VO - Output Voltage - V 3.300 3.295 IO = 150 mA 3.290 3.285 3.280 IO = 150 mA 1.495 1.490 1.485 3.275 1.480 3.270 3.265 -50 8 -25 0 25 50 75 100 TA - Free-Air Temperature - C Figure 4. Submit Documentation Feedback 125 150 1.475 -50 -25 0 25 50 75 100 125 TA - Free-Air Temperature - C Figure 5. 150 Copyright (c) 2007, Texas Instruments Incorporated TPS76501-Q1 ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT VOLTAGE REGULATOR www.ti.com 35.0 TPS76533 TPS76515 GROUND CURRENT vs LOAD CURRENT GROUND CURRENT vs LOAD CURRENT 34.0 VO = 3.3 V TA = 25C 34.9 34.8 34.7 34.6 34.5 34.4 34.3 34.2 34.1 33.8 33.7 33.6 33.5 33.4 33.3 33.2 33.1 34.0 33.0 0 25 50 75 100 125 150 0 75 100 125 GROUND CURRENT vs FREE-AIR TEMPERATURE GROUND CURRENT vs FREE-AIR TEMPERATURE 55 50 50 45 40 35 30 25 20 10 -50 50 IL - Load Current - mA Figure 7. TPS76515 55 15 25 IL - Load Current - mA Figure 6. TPS76533 I GND - Ground Current - A I GND - Ground Current - A VO = 1.5 V TA = 25C 33.9 I GND - Ground Current - A I GND - Ground Current - A SLVS800 - DECEMBER 2007 VO = 3.3 V IO = 150 mA 0 45 40 35 30 25 20 50 100 TA - Free-Air Temperature - C Figure 8. Copyright (c) 2007, Texas Instruments Incorporated 150 150 15 -50 VO = 1.5 V IO = 150 mA 0 50 100 150 TA - Free-Air Temperature - C Figure 9. Submit Documentation Feedback 9 TPS76501-Q1 ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT VOLTAGE REGULATOR www.ti.com SLVS800 - DECEMBER 2007 TPS76533 TPS76533 POWER SUPPLY RIPPLE REJECTION vs FREQUENCY OUTPUT SPECTRAL NOISE DENSITY vs FREQUENCY 101 VI = 4.3 V CO = 10 F IO = 150 mA TA = 25C 60 Output Spectral Noise Density - V Hz PSRR - Power Supply Ripple Rejection - dB 70 50 40 30 20 10 10.00 10 IO = 150 mA IO = 1 mA 100 10-1 VI = 4.3 V CO = 10 F TA = 25C 10-2 100.00 100 1000.0010000.00 1k 10k 100000.00 100k 1000000.00 1M 10000000.00 10M 1k 100 f - Frequency - Hz Figure 10. 10k 100k f - Frequency - Hz Figure 11. TPS76533 OUTPUT IMPEDANCE vs FREQUENCY 101 Zo - Output Impedance - VI = 4.3 V CO = 10 F TA = 25C 100 IO = 1 mA 10-1 IO = 150 mA 10-2 10 100 1k 10k 100k 1M f - Frequency - Hz Figure 12. 10 Submit Documentation Feedback Copyright (c) 2007, Texas Instruments Incorporated TPS76501-Q1 ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT VOLTAGE REGULATOR www.ti.com SLVS800 - DECEMBER 2007 TPS76550 TPS76533 DROPOUT VOLTAGE vs FREE-AIR TEMPERATURE DROPOUT VOLTAGE vs FREE-AIR TEMPERATURE 100 100 VI = 3.2 V V DO - Output Voltage - V V DO - Output Voltage - V VI = 4.9 V CO = 4.7 F IO = 150 mA 10-1 IO = 50 mA 10-2 IO = 150 mA 10-1 IO = 50 mA IO = 10 mA 10-2 IO = 10 mA 10-3 10-3 -50 -25 0 25 50 75 100 125 150 -50 TA - Free-Air Temperature - C Figure 13. TPS76515 -25 0 25 50 75 100 125 150 TA - Free-Air Temperature - C Figure 14. TPS76515 LOAD TRANSIENT RESPONSE LINE TRANSIENT RESPONSE VO - Change in Output Voltage - mV VO - Change in Output Voltage - mV 400 CL = 4.7 F TA = 25C 100 50 0 I O - Output Current - mA VI - Input Voltage - V -50 3.7 2.7 0 100 200 300 400 500 600 700 800 900 1000 t - Time - s Figure 15. Copyright (c) 2007, Texas Instruments Incorporated CL = 4.7 F TA = 25C 200 0 -200 -400 150 0 0 100 200 300 400 500 600 700 800 900 1000 t - Time - s Figure 16. Submit Documentation Feedback 11 TPS76501-Q1 ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT VOLTAGE REGULATOR www.ti.com SLVS800 - DECEMBER 2007 TPS76533 TPS76533 LINE TRANSIENT RESPONSE LOAD TRANSIENT RESPONSE VO - Change in Output Voltage - mV VO - Change in Output Voltage - mV 400 CL = 4.7 F TA = 25C 100 50 0 I O - Output Current - mA VI - Input Voltage - V -50 -100 5.3 4.3 0 150 0 0 100 200 300 400 500 600 700 800 900 1000 t - Time - s Figure 18. TPS76501 OUTPUT VOLTAGE vs TIME (AT STARTUP) DROPOUT VOLTAGE vs INPUT VOLTAGE 0.30 IO = 150 mA 3 0.25 2 V DO - Output Voltage - V VO- Output Voltage - V -200 Figure 17. TPS76533 1 0 Enable Pulse - V 0 100 200 300 400 500 600 700 800 900 1000 t - Time - s 4 4.3 0.20 TA = 125C 0.15 TA = 25C 0.10 TA = -40C 0.05 0 0 12 CL = 4.7 F TA = 25C 200 100 200 300 400 500 600 700 800 900 1000 t - Time - s Figure 19. Submit Documentation Feedback 0.00 2.5 3.0 3.5 4.0 4.5 5.0 VI - Input Voltage - V Figure 20. Copyright (c) 2007, Texas Instruments Incorporated TPS76501-Q1 ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT VOLTAGE REGULATOR www.ti.com SLVS800 - DECEMBER 2007 TYPICAL REGION OF STABILITY TYPICAL REGION OF STABILITY EQUIVALENT SERIES RESISTANCE(1) vs OUTPUT CURRENT EQUIVALENT SERIES RESISTANCE(1) vs OUTPUT CURRENT 100.00 102 Region of Instability Maximum ESR ESR - Equivalent Series Resistance - ESR - Equivalent Series Resistance - 100.00 102 101 10.00 Region of Stability VI = 4.3 V CO = 4.7 F VO = 3.3 V TA = 25C 1.00 100 Minimum ESR -1 0.10 10 Region of Instability Maximum ESR Region of Instability 10.00 101 Region of Stability 1.00 100 VI = 4.3 V CO = 4.7 F VO = 3.3 V TA = 125C -1 0.10 10 Minimum ESR Region of Instability -2 10 0.01 -2 0.01 10 0 25 50 75 100 125 150 0 25 75 100 125 IO - Output Current - mA Figure 22. TYPICAL REGION OF STABILITY EQUIVALENT SERIES RESISTANCE(1) vs OUTPUT CURRENT EQUIVALENT SERIES RESISTANCE(1) vs OUTPUT CURRENT 150 2 100 10 100.00 102 ESR - Equivalent Series Resistance - Maximum ESR ESR - Equivalent Series Resistance - 50 IO - Output Current - mA Figure 21. TYPICAL REGION OF STABILITY Region of Instability 10.00 101 1.00 100 VI = 4.3 V CO = 10 F VO = 3.3 V TA = 25C -1 0.10 10 Region of Stability Minimum ESR Region of Instability Maximum ESR Region of Instability 101 Region of Stability 100 VI = 4.3 V CO = 10 F VO = 3.3 V TA = 125C 10-1 Minimum ESR Region of Instability -2 10-2 10 -2 0.01 10 0 25 50 75 100 IO - Output Current - mA Figure 23. 125 150 0 25 50 75 100 125 150 IO - Output Current - mA Figure 24. (1) Equivalent series resistance (ESR) refers to the total series resistance, including the ESR of the capacitor, any series resistance added externally, and PWB trace resistance to CO. Copyright (c) 2007, Texas Instruments Incorporated Submit Documentation Feedback 13 TPS76501-Q1 ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT VOLTAGE REGULATOR www.ti.com SLVS800 - DECEMBER 2007 TYPICAL REGION OF STABILITY TYPICAL REGION OF STABILITY EQUIVALENT SERIES RESISTANCE(1) vs ADDED CERAMIC CAPACITANCE EQUIVALENT SERIES RESISTANCE(1) vs ADDED CERAMIC CAPACITANCE 10.00 101 VI = 4.3 V CO = 4.7 F VO = 3.3 V TA = 25C IO = 150 mA ESR - Equivalent Series Resistance - ESR - Equivalent Series Resistance - 101 10.00 0 10 1.00 -1 0.10 10 Minimum ESR Region of Instability -2 10 0.01 0.0 0.2 0.4 0.6 0.8 1.0 VI = 4.3 V VO = 3.3 V CO = 10 F TA = 25C IO = 150 mA 1.00 100 -1 10 0.10 Minimum ESR Region of Instability -2 10 0.01 0.0 0.2 Added Ceramic Capacitance - F Figure 25. 0.4 0.6 0.8 1.0 Added Ceramic Capacitance - F Figure 26. (1) Equivalent series resistance (ESR) refers to the total series resistance, including the ESR of the capacitor, any series resistance added externally, and PWB trace resistance to CO. VI To Load IN OUT + EN CO GND RL ESR Figure 27. Test Circuit for Typical Regions of Stability (Figure 21 through Figure 24) (Fixed-Output Options) 14 Submit Documentation Feedback Copyright (c) 2007, Texas Instruments Incorporated www.ti.com TPS76501-Q1 ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT VOLTAGE REGULATOR SLVS800 - DECEMBER 2007 APPLICATION INFORMATION The TPS765xx family includes eight fixed-output voltage regulators (1.5 V, 1.8 V, 2.5 V, 2.7 V, 2.8 V, 3 V, 3.3 V, and 5 V), and an adjustable regulator, the TPS76501 (adjustable from 1.25 V to 5.5 V). Device Operation The TPS765xx features very low quiescent current, which remains virtually constant even with varying loads. Conventional LDO regulators use a pnp pass element, the base current of which is directly proportional to the load current through the regulator (IB = IC/). The TPS765xx uses a PMOS transistor to pass current; because the gate of the PMOS is voltage driven, operating current is low and invariable over the full load range. Another pitfall associated with the pnp-pass element is its tendency to saturate when the device goes into dropout. The resulting drop in forces an increase in IB to maintain the load. During power up, this translates to large start-up currents. Systems with limited supply current may fail to start up. In battery-powered systems, it means rapid battery discharge when the voltage decays below the minimum required for regulation. The TPS765xx quiescent current remains low even when the regulator drops out, eliminating both problems. The TPS765xx also features a shutdown mode that places the output in the high-impedance state (essentially equal to the feedback-divider resistance) and reduces quiescent current to 1 A (typ). If the shutdown feature is not used, EN should be tied to ground. Response to an enable transition is quick; regulated output voltage is reestablished in typically 160 s. Minimum Load Requirements The TPS765xx is stable even at zero load; no minimum load is required for operation. FB Pin Connection The FB pin is an input pin to sense the output voltage and close the loop for the adjustable voltage. The output voltage is sensed through a resistor divider network to close the loop as it is shown in Figure 29. Normally, this connection should be as short as possible; however, the connection can be made near a critical circuit to improve performance at that point. Internally, FB connects to a high-impedance wide-bandwidth amplifier and noise pickup feeds through to the regulator output. Routing the FB connection to minimize/avoid noise pickup is essential. External Capacitor Requirements An input capacitor is not usually required; however, a ceramic bypass capacitor (0.047 F or larger) improves load transient response and noise rejection if the TPS765xx is located more than a few inches from the power supply. A higher-capacitance electrolytic capacitor may be necessary if large (hundreds of milliamps) load transients with fast rise times are anticipated. Like all LDO regulators, the TPS765xx requires an output capacitor connected between OUT and GND to stabilize the internal control loop. The minimum recommended capacitance value is 4.7 F and the ESR must be between 300 m and 20 . Capacitor values 4.7 F or larger are acceptable, provided the ESR is less than 20 . Solid tantalum electrolytic, aluminum electrolytic, and multilayer ceramic capacitors are all suitable, provided they meet the requirements described previously. Copyright (c) 2007, Texas Instruments Incorporated Submit Documentation Feedback 15 TPS76501-Q1 ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT VOLTAGE REGULATOR www.ti.com SLVS800 - DECEMBER 2007 TPS765xx 5 VI IN PG 6 NC/FB IN OUT 0.1 F 4 EN OUT 2 PG 1 250 k 7 VO 8 + GND 3 CO 4.7 F 300 m Figure 28. Typical Application Circuit (Fixed Versions) Programming the TPS76501 Adjustable LDO Regulator The output voltage of the TPS76501 adjustable regulator is programmed using an external resistor divider as shown in Figure 29. The output voltage is calculated using Equation 1: V O +V ref 1 ) R1 R2 (1) Where Vref = 1.224 V (typ) (the internal reference voltage) Resistors R1 and R2 should be chosen for approximately 7-A divider current. Lower-value resistors can be used but offer no inherent advantage and waste more power. Higher values should be avoided as leakage currents at FB increase the output voltage error. The recommended design procedure is to choose R2 = 169 k to set the divider current at 7 A and then calculate R1 using Equation 2: R1 + V V O *1 ref R2 (2) OUTPUT VOLTAGE PROGRAMMING GUIDE TPS76501 VI 0.1 F IN PG 250 k 2.0 V 0.8 V OUTPUT VOLTAGE PG EN OUT VO R1 FB / NC GND R2 CO R1 R2 UNIT 2.5 V 174 169 k 3.3 V 287 169 k 3.6 V 324 169 k 4.0 V 383 169 k 5.0 V 523 169 k 300 m Figure 29. TPS76501 Adjustable LDO Regulator Programming 16 Submit Documentation Feedback Copyright (c) 2007, Texas Instruments Incorporated TPS76501-Q1 ULTRALOW QUIESCENT CURRENT 150-mA LOW-DROPOUT VOLTAGE REGULATOR www.ti.com SLVS800 - DECEMBER 2007 Power-Good Indicator (PG) The TPS765xx features a power-good output that can be used to monitor the status of the regulator. The internal comparator monitors the output voltage: when the output drops to between 92% and 98% of its nominal regulated value, the PG output transistor turns on, taking the signal low. The open-drain output requires a pullup resistor. If not used, it can be left floating. PG can be used to drive power-on reset circuitry or used as a low-battery indicator. Regulator Protection The TPS765xx PMOS-pass transistor has a built-in back diode that conducts reverse currents when the input voltage drops below the output voltage (e.g., during power down). Current is conducted from the output to the input and is not internally limited. When extended reverse voltage is anticipated, external limiting may be appropriate. The TPS765xx also features internal current limiting and thermal protection. During normal operation, the TPS765xx limits output current to approximately 0.8 A. When current limiting engages, the output voltage scales back linearly until the overcurrent condition ends. While current limiting is designed to prevent gross device failure, care should be taken not to exceed the power dissipation ratings of the package. If the temperature of the device exceeds 150C (typical), thermal-protection circuitry shuts it down. Once the device has cooled below 130C (typical), regulator operation resumes. Power Dissipation and Junction Temperature Specified regulator operation is assured to a junction temperature of 125C; the maximum junction temperature should be restricted to 125C under normal operating conditions. This restriction limits the power dissipation the regulator can handle in any given application. To ensure the junction temperature is within acceptable limits, calculate the maximum allowable dissipation, PD(max), and the actual dissipation, PD, which must be less than or equal to PD(max). The maximum-power-dissipation limit is determined using the following equation: T max * T A P + J D(max) R qJA Where TJmax is the maximum allowable junction temperature. RJA is the thermal resistance junction-to-ambient for the package. TA is the ambient temperature. The regulator dissipation is calculated using: P D + V *V I O I O Power dissipation resulting from quiescent current is negligible. Excessive power dissipation triggers the thermal protection circuit. Copyright (c) 2007, Texas Instruments Incorporated Submit Documentation Feedback 17 PACKAGE OPTION ADDENDUM www.ti.com 18-Sep-2008 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing TPS76501QDRQ1 ACTIVE SOIC D Pins Package Eco Plan (2) Qty 8 2500 Green (RoHS & no Sb/Br) Lead/Ball Finish CU NIPDAU MSL Peak Temp (3) Level-1-260C-UNLIM (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. 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