a High Accuracy anyCAP® 50 mA Low Dropout Linear Regulator ADP3300 FEATURES High Accuracy (Over Line and Load Regulations at 25ⴗC): ⴞ0.8% Ultralow Dropout Voltage: 80 mV Typical @ 50 mA Requires Only CO = 0.47 F for Stability anyCAP™ = Stable with All Types of Capacitors (Including MLCC) Current and Thermal Limiting Low Noise Dropout Detector Low Shutdown Current: 1 A 3.0 V to 12 V Supply Range –40ⴗC to +85ⴗC Ambient Temperature Range Several Fixed Voltage Options Ultrasmall SOT-23 6-Lead Package Excellent Line and Load Regulations APPLICATIONS Cellular Telephones Notebook, Palmtop Computers Battery Powered Systems PCMCIA Regulators Bar Code Scanners Camcorders, Cameras FUNCTIONAL BLOCK DIAGRAM ADP3300 Q1 IN THERMAL PROTECTION ERR CC DRIVER Q2 OUT R1 Gm SD R2 BANDGAP REF GND NR 2 ADP3300-5 VIN 5 IN OUT 4 C1 0.47 F 6 VOUT = +5V R1 330kΩ EOUT C2 0.47 F GENERAL DESCRIPTION The ADP3300 is a member of the ADP330x family of precision low dropout anyCAP™ voltage regulators. The ADP3300 stands out from conventional LDOs with a novel architecture and an enhanced process. Its patented design requires only a 0.47 µF output capacitor for stability. This device is stable with any capacitor, regardless of its ESR (Equivalent Series Resistance) value, including ceramic types (MLCC) for space restricted applications. The ADP3300 achieves exceptional accuracy of ±0.8% at room temperature and ± 1.4% overall accuracy over temperature, line and load regulations. The dropout voltage of the ADP3300 is only 80 mV (typical) at 50 mA. The ADP3300 operates with a wide input voltage range from 3.0 V to 12 V and delivers a load current in excess of 50 mA. It features an error flag that signals when the device is about to lose regulation or when the short circuit or thermal overload protection is activated. Other features include shutdown and optional noise reduction capabilities. The ADP330x anyCAP™ 1 3 ON OFF GND Figure 1. Typical Application Circuit LDO family offers a wide range of output voltages and output current levels from 50 mA to 200 mA: ADP3301 (100 mA) ADP3302 (100 mA, Dual Output) ADP3303 (200 mA) anyCAP is a registered trademark of Analog Devices Inc. REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 ADP3300–SPECIFICATIONS (@noted)T = –40ⴗC to +85ⴗC, V A IN = 7 V, CIN = 0.47 F, COUT = 0.47 F, unless otherwise Parameter Symbol Conditions Min OUTPUT VOLTAGE ACCURACY VOUT VIN = VOUT(NOM) +0.3 V to 12 V IL = 0.1 mA to 50 mA TA = +25°C VIN = VOUT(NOM) +0.3 V to 12 V IL = 0.1 mA to 50 mA Typ Max Units –0.8 +0.8 % –1.4 +1.4 % ∆VO ∆VIN VIN = VOUT(NOM) +0.3 V to 12 V TA = +25°C 0.02 mV/V ∆VO ∆IL IL = 0.1 mA to 50 mA TA = +25°C 0.06 mV/mA GROUND CURRENT IGND IL = 50 mA IL = 0.1 mA 0.55 0.19 1.7 0.3 mA mA GROUND CURRENT IN DROPOUT IGND VIN = 2.5 V IL = 0.1 mA 0.6 1.2 mA DROPOUT VOLTAGE VDROP VOUT = 98% of VOUT(NOM) IL = 50 mA IL = 10 mA IL = 1 mA 0.08 0.025 0.004 0.17 0.07 0.03 V V V 0.75 0.75 0.3 V V 1 22 µA µA 0.005 1 µA 0.01 3 µA LINE REGULATION LOAD REGULATION SHUTDOWN THRESHOLD VTHSD ON OFF 2.0 SHUTDOWN PIN INPUT CURRENT ISDIN 0 < VSD ≤ 5 V 5 < VSD ≤ 12 V @ VIN = 12 V GROUND CURRENT IN SHUTDOWN MODE IQ VSD = 0, VIN = 12 V TA = +25°C VSD = 0, VIN = 12 V TA = +85°C IOSD TA = +25°C @ VIN = 12 V TA = +85°C @ VIN = 12 V 2 4 µA µA ERROR PIN OUTPUT LEAKAGE IEL VEO = 5 V 13 µA ERROR PIN OUTPUT “LOW” VOLTAGE VEOL ISINK = 400 µA 0.12 0.3 V PEAK LOAD CURRENT ILDPK VIN = VOUT(NOM) + 1 V 100 mA OUTPUT NOISE @ 5 V OUTPUT VNOISE f = 10 Hz–100 kHz CNR = 0 CNR = 10 nF, CL = 10 µF 100 30 µV rms µV rms OUTPUT CURRENT IN SHUTDOWN MODE NOTE Ambient temperature of +85°C corresponds to a typical junction temperature of +125°C under typical full load test conditions. Specifications subject to change without notice. –2– REV. A ADP3300 ABSOLUTE MAXIMUM RATINGS* PIN FUNCTION DESCRIPTIONS Input Supply Voltage . . . . . . . . . . . . . . . . . . . . –0.3 V to +16 V Shutdown Input Voltage . . . . . . . . . . . . . . . . . –0.3 V to +16 V Error Flag Output Voltage . . . . . . . . . . . . . . . . –0.3 V to +16 V Noise Bypass Pin Voltage . . . . . . . . . . . . . . . . . –0.3 V to +5 V Power Dissipation . . . . . . . . . . . . . . . . . . . . Internally Limited Operating Ambient Temperature Range . . . . –55°C to +125°C Operating Junction Temperature Range . . . . –55°C to +125°C θJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165°C θJC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92°C Storage Temperature Range . . . . . . . . . . . . . –65°C to +150°C Lead Temperature Range (Soldering 10 sec) . . . . . . . . +300°C Vapor Phase (60 sec ) . . . . . . . . . . . . . . . . . . . . . . . . +215°C Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C Pin Mnemonic Function 1 GND Ground Pin. 2 NR Noise Reduction Pin. Used for further reduction of the output noise (see text for details). No connection if not used. 3 SD Active Low Shutdown Pin. Connect to ground to disable the regulator output. When shutdown is not used, this pin should be connected to the input pin. 4 OUT Output of the Regulator, fixed 2.7, 3.0, 3.2, 3.3 or 5 volts output voltage. Bypass to ground with a 0.47 µF or larger capacitor. 5 IN Regulator Input. 6 ERR Open Collector Output which goes low to indicate that the output is about to go out of regulation. *This is a stress rating only; operation beyond these limits can cause the device to be permanently damaged. PIN CONFIGURATION 6 ERR GND 1 ADP3300 5 IN TOP VIEW SD 3 (Not to Scale) 4 OUT NR 2 ORDERING GUIDE Model Voltage Output Package Description Package Options Branding Information ADP3300ART-2.7 ADP3300ART-3 ADP3300ART-3.2 ADP3300ART-3.3 ADP3300ART-5 2.7 V 3.0 V 3.2 V 3.3 V 5.0 V Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount SOT-23-6 SOT-23-6 SOT-23-6 SOT-23-6 SOT-23-6 LAB LBB LCB LDB LEB Contact the factory for the availability of other output voltage options. CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADP3300 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. REV. A –3– WARNING! ESD SENSITIVE DEVICE ADP3300–Typical Performance Characteristics 3.202 3.202 800 IL = 10mA 3.199 VOUT = 3.2V 3.198 IL = 50mA 3.197 A 3.200 3.199 3.198 3.197 \ GROUND CURRENT – 3.200 3.196 3.3 4 VOUT = 3.2V VIN = 7V 3.201 3.201 OUTPUT VOLTAGE – Volts OUTPUT VOLTAGE – Volts IL = 0mA VOUT = 3.2V IL = 0mA 640 480 320 160 3.196 3.195 5 0 6 7 8 9 10 11 12 13 14 INPUT VOLTAGE – Volts Figure 2. Line Regulation Output Voltage vs. Supply Voltage 8 16 0 24 32 40 48 56 64 72 80 OUTPUT LOAD – mA Figure 3. Output Voltage vs. Load Current 0 Figure 4. Quiescent Current vs. Supply Voltage 0.2 820 1.2 2.4 3.6 4.8 6.0 7.2 8.4 9.6 10.8 12.0 INPUT VOLTAGE – Volts 700 560 430 IL = 0 TO 80mA VIN = 7V 300 170 A 0.0 IL = 0 – 50mA –0.1 –0.2 –0.3 0 20 40 60 OUTPUT LOAD – mA 80 Figure 5. Quiescent Current vs. Load Current Figure 6. Output Voltage Variation % vs. Temperature 48 24 0 20 40 60 OUTPUT LOAD – mA 80 Figure 8. Dropout Voltage vs. Output Current IL = 0mA 200 15 35 55 75 95 115 135 TEMPERATURE – C 8.0 VOUT = 3.2V RL = 64Ω VIN 4 3 2 RL = 33Ω 1 0 300 Figure 7. Quiescent Current vs. Temperature INPUT/OUTPUT VOLTAGE – Volts INPUT/OUTPUT VOLTAGE – Volts INPUT/OUTPUT VOLTAGE – mV 72 400 0 –45 –25 –5 15 35 55 75 95 115 135 TEMPERATURE – C 5 96 IL = 50mA 500 100 –0.4 –45 –25 –5 120 0 GROUND CURRENT – 690 OUTPUT VOLTAGE – % GROUND CURRENT – µA VIN = 7V 600 0.1 0 1 2 4 3 2 3 INPUT VOLTAGE – Volts 1 0 Figure 9. Power-Up/Power-Down –4– 7.0 6.0 5.0 4.0 VOUT 3.0 VSD = VIN CL = 0.47µF RL = 66Ω VOUT = 3.3V 2.0 1.0 0 0 20 40 60 80 100 120 140 160 180 200 TIME – µs Figure 10. Power-Up Overshoot REV. A ADP3300 3.220 3.220 3.220 VOUT = 3.2V VOUT = 3.2V 3.210 3.200 3.200 3.180 Volts 3.180 3.190 7.5 7.5 VIN 0 20 40 Figure 11. Line Transient Response 1mA 1 0 60 80 100 120 140 160 180 200 TIME – µs IOUT = 50mA 50 7.0 7.0 20 40 60 0 80 100 120 140 160 180 200 TIME – µs 200 400 600 TIME – µs 800 1000 Figure 13. Load Transient Figure 12. Line Transient Response Volts 4 3.220 VOUT = 3.2V CL = 4.7µF 3.205 Volts RL = 64Ω CL = 0.47µF mA Volts RL = 3.2kΩ CL = 0.47µF 3.200 3.195 3.190 3.190 VOUT = 3.2V CL = 0.47µF 3.205 Volts 3.210 VOUT = 3.0V 3.0 VOUT 0 VOUT CL = 0.47µF 3 3.2V 3.200 2 3.190 150 IOUT = 50mA 400 600 TIME – µs 800 0 1000 –10 RIPPLE REJECTION – dB Volts 2 3 TIME – sec 4 1 0 3 V 0 –20 –30 VOUT = 3.3V a. 0.47µF, RL = 33kΩ b. 0.47µF, RL = 64Ω b c. 4.7µF, RL = 33kΩ d. 4.7µF, RL = 64Ω –40 –50 d a –60 –70 c b d –80 –90 0 20 40 60 TIME – µs 80 Figure 17. Turn Off REV. A 0 5 0 VOUT = 3.2V RL = 64Ω CL = 0.47µF 2 Volts 1 100 –100 10 a c 100 1k 10k 100k FREQUENCY – Hz 1M 10M Figure 18. Power Supply Ripple Rejection –5– 20 40 60 TIME – s 80 100 Figure 16. Turn On Figure 15. Short Circuit Current 4 3 V +3V 0 0 Figure 14. Load Transient 3.2V VOUT = 3.2V RL = 64Ω 1 0 +3 VOLTAGE NOISE SPECTRAL DENSITY – µV/ Hz 1 200 100 VIN = 7V 1mA 0 IOUT 50 mA 50 CL = 4.7µF Volts 200 mA 3.195 10 0.47µF BYPASS PIN 5 TO PIN 1 VOUT = 5V, CL = 0.47µF, IL = 1mA, CNR = 0 1 VOUT = 3.3V, CL = 0.47µF, IL = 1mA, CNR = 0 0.1 VOUT = 2.7-5.0V, CL = 0.47µF, IL = 1mA, CNR = 10nF VOUT = 2.7-5.0V, CL = 0.47µF, IL = 1mA, CNR = 10nF 0.01 100 10k 1k FREQUENCY – Hz 100k Figure 19. Output Noise Density ADP3300 be stable with just a small 0.47 µF capacitor on the output. Additional advantages of the pole splitting scheme include superior line noise rejection and very high regulator gain, which leads to excellent line and load regulation. An impressive ±1.4% accuracy is guaranteed over line, load and temperature. THEORY OF OPERATION The new anyCAP™ LDO ADP3300 uses a single control loop for regulation and reference functions. The output voltage is sensed by a resistive voltage divider consisting of R1 and R2 which is varied to provide the available output voltage option. Feedback is taken from this network by way of a series diode (D1) and a second resistor divider (R3 and R4) to the input of an amplifier. Additional features of the circuit include current limit, thermal shutdown and noise reduction. Compared to the standard solutions that give warning after the output has lost regulation, the ADP3300 provides improved system performance by enabling the ERR pin to give warning before the device loses regulation. OUTPUT INPUT Q1 NONINVERTING WIDEBAND DRIVER COMPENSATION CAPACITOR Gm R1 ATTENUATION (VBANDGAP/VOUT) PTAT VOS R4 R3 As the chip’s temperature rises above 165°C, the circuit activates a soft thermal shutdown, indicated by a signal low on the ERR pin, to reduce the current to a safe level. D1 (a) PTAT CURRENT R2 RLOAD To reduce the noise gain of the loop, the node of the main divider network (a) is made available at the noise reduction (NR) pin, which can be bypassed with a small capacitor (10 nF–100 nF). CLOAD ADP3300 APPLICATION INFORMATION Capacitor Selection: anyCAP™ Figure 20. Functional Block Diagram A very high gain error amplifier is used to control this loop. The amplifier is constructed in such a way that at equilibrium it produces a large, temperature proportional input “offset voltage” that is repeatable and very well controlled. The temperatureproportional offset voltage is combined with the complimentary diode voltage to form a “virtual bandgap” voltage, implicit in the network, although it never appears explicitly in the circuit. Ultimately, this patented design makes it possible to control the loop with only one amplifier. This technique also improves the noise characteristics of the amplifier by providing more flexibility on the trade-off of noise sources that leads to a low noise design. The R1, R2 divider is chosen in the same ratio as the bandgap voltage to the output voltage. Although the R1, R2 resistor divider is loaded by the diode D1 and a second divider consisting of R3 and R4, the values are chosen to produce a temperature stable output. This unique arrangement specifically corrects for the loading of the divider so that the error resulting from base current loading in conventional circuits is avoided. The patented amplifier controls a new and unique noninverting driver that drives the pass transistor, Q1. The use of this special noninverting driver enables the frequency compensation to include the load capacitor in a pole splitting arrangement to achieve reduced sensitivity to the value, type and ESR of the load capacitance. Most LDOs place strict requirements on the range of ESR values for the output capacitor because they are difficult to stabilize due to the uncertainty of load capacitance and resistance. Moreover, the ESR value, required to keep conventional LDOs stable, changes depending on load and temperature. These ESR limitations make designing with LDOs more difficult because of their unclear specifications and extreme variations over temperature. Output Capacitors: as with any micropower device, output transient response is a function of the output capacitance. The ADP3300 is stable with a wide range of capacitor values, types and ESR (anyCAP™). A capacitor as low as 0.47 µF is all that is needed for stability. However, larger capacitors can be used if high output current surges are anticipated. The ADP3300 is stable with extremely low ESR capacitors (ESR ≈ 0), such as multilayer ceramic capacitors (MLCC) or OSCON. Input Bypass Capacitor: an input bypass capacitor is not required; however, for applications where the input source is high impedance or far from the input pins, a bypass capacitor is recommended. Connecting a 0.47 µF capacitor from the input to ground reduces the circuit’s sensitivity to PC board layout. If a bigger output capacitor is used, the input capacitor should be 1 µF minimum. Noise Reduction A noise reduction capacitor (CNR) can be used to further reduce the noise by 6 dB–10 dB (Figure 21). Low leakage capacitors in the 10 nF–100 nF range provide the best performance. For load current less than 200 µA, a 4.7 µF output capacitor provides the lowest noise and the best overall performance. Since the noise reduction pin (NR) is internally connected to a high impedance node, any connection to this node should be carefully done to avoid noise pickup from external sources. The pad connected to this pin should be as small as possible. Long PC board traces are not recommended. NR 2 CNR 10nF ADP3300-5 VIN OUT 4 5 IN C1 + 1.0 F VOUT = +5V 330kΩ 6 3 EOUT + C2 4.7 F 1 ON OFF This is no longer true with the ADP3300 anyCAP™ LDO. It can be used with virtually any capacitor, with no constraint on the minimum ESR. The innovative design allows the circuit to GND Figure 21. Noise Reduction Circuit –6– REV. A ADP3300 Thermal Overload Protection Error Flag Dropout Detector The ADP3300 is protected against damage due to excessive power dissipation by its thermal overload protection circuit, which limits the die temperature to a maximum of 165°C. Under extreme conditions (i.e., high ambient temperature and high power dissipation), where die temperature starts to rise above 165°C, the output current is reduced until die temperature has dropped to a safe level. Output current is restored when the die temperature is reduced. The ADP3300 will maintain its output voltage over a wide range of load, input voltage and temperature conditions. If the output is about to lose regulation, for example, by reducing the supply voltage below the combined regulated output and dropout voltages, the ERR pin will be activated. The ERR output is an open collector that will be driven low. Current and thermal limit protections are intended to protect the device against accidental overload conditions. For normal operation, device power dissipation should be externally limited so that junction temperatures will not exceed 125°C. Calculating Junction Temperature Device power dissipation is calculated as follows: PD = (VIN – VOUT) ILOAD + (VIN) IGND Where ILOAD and IGND are load current and ground current, VIN and VOUT are input and output voltages respectively. Once set, the ERRor flag’s hysteresis will keep the output low until a small margin of operating range is restored either by raising the supply voltage or reducing the load. APPLICATION CIRCUITS Crossover Switch The circuit in Figure 22 shows that two ADP3300s can be used to form a mixed supply voltage system. The output switches between two different levels selected by an external digital input. Output voltages can be any combination of voltages from the Ordering Guide. Assuming ILOAD = 50 mA, IGND = 0.5 mA, VIN = 8 V and VOUT = 3.3 V, device power dissipation is: VIN = 5.5V TO 12V VOUT = 5V/3.3V ADP3300-5.0 OUTPUT SELECT 5.0V 0V PD = (8 – 3.3) 0.05 + 8 × 0.5 mA = 0.239 W OUT IN GND ∆T = TJ – TA = PD × θJA = 0.239 × 165 = 39.4°C With a maximum junction temperature of 125°C, this yields a maximum ambient temperature of 85°C. OUT IN C1 1.0 F C2 0.47 F ADP3300-3.3 Printed Circuit Board Layout Consideration GND Surface mount components rely on the conductive traces or pads to transfer heat away from the device. Appropriate PC board layout techniques should be used to remove heat from the immediate vicinity of the package. The following general guidelines will be helpful when designing a board layout: Figure 22. Crossover Switch Higher Output Current If higher current is needed, an appropriate pass transistor can be used, as in Figure 23, to increase the output current to 1 A. 1. PC board traces with larger cross section areas will remove more heat. For optimum results, use PC boards with thicker copper and wider traces. MJE253* VIN = 6V TO 8V C1 47 F 2. Increase the surface area exposed to open air so heat can be removed by convection or forced air flow. VOUT = 5V @ 1A R1 50Ω IN 3. Do not use solder mask or silkscreen on the heat dissipating traces because it will increase the junction to ambient thermal resistance of the package. OUT ADP3300-5 C2 10 F Shutdown Mode GND Applying a TTL high signal to the shutdown pin or tying it to the input pin will turn the output ON. Pulling the shutdown pin down to 0.3 V or below, or tying it to ground, will turn the output OFF. In shutdown mode, quiescent current is reduced to less than 1 µA. REV. A *AAVID531002 HEAT SINK IS USED Figure 23. High Output Current Linear Regulator –7– ADP3300 dropout voltage, which limits the power dissipation of the LDO to 15 mW. The ADP3000 used in this circuit is a switching regulator in the step-up configuration. Constant Dropout Post Regulator The circuit in Figure 24 provides high precision with low dropout for any regulated output voltage. It significantly reduces the ripple from a switching regulator while providing a constant D1 1N5817 ADP3300-5 IN C1 100 F 10V R1 120Ω ILIM C2 100µF 10V VIN 5V @ 50mA GND C3 2.2 F SW1 ADP3000-ADJ GND R2 30.1kΩ 1% OUT SW2 Q1 2N3906 FB Q2 2N3906 R3 124kΩ 1% R4 274kΩ Figure 24. Constant Dropout Post Regulator OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 6-Lead Surface Mount Package (SOT-23) 0.122 (3.10) 0.106 (2.70) 0.071 (1.80) 0.059 (1.50) 6 5 4 1 2 3 0.118 (3.00) 0.098 (2.50) PIN 1 0.037 (0.95) BSC 0.075 (1.90) BSC 0.051 (1.30) 0.035 (0.90) 0.059 (0.15) 0.000 (0.00) 0.057 (1.45) 0.035 (0.90) 0.020 (0.50) SEATING 0.010 (0.25) PLANE 10° 0.009 (0.23) 0° 0.003 (0.08) 0.022 (0.55) 0.014 (0.35) PRINTED IN U.S.A. VIN = 2.5V TO 3.5V C00132–0–7/00 (rev .A) L1 6.8 H –8– REV. A