AS1374

Datasheet AS1374 200mA, Ultra-Low-Noise, High-PSRR, Dual Low Dropout Regulators 1 General Description The AS1374 is a ultra-low-noise, low-dropout linear regulator with two seperated outputs. Specifically designed to deliver 200mA continuous output current at each output pin. The LDOs can achieve a low 120mV dropout for 200mA load current and are designed and optimized to work with low-cost, small-capacitance ceramic capacitors. An integrated P-channel MOSFET pass transistor allows the devices to maintain extremely low quiescent current (30µA). The AS1374 uses an advanced architecture to achieve ultra-low output voltage noise of 20µVRMS and a powersupply rejection-ratio of better than 85dB (@ 1kHz). Two active-High enable pins allows to switch on or off each output independently from each other. The AS1374 requires only 1µF output capacitor for stability at any load. The device is available in a 6-bump WLP package. 2 Key Features ! ! ! ! ! ! ! ! ! ! ! Preset Output Voltages: 1.2 to 3.6V (in 50mV steps) Output Noise: 20µVRMS @ 100Hz to 100kHz Power-Supply Rejection Ratio: 85dB @ 1kHz Low Dropout: 120mV @ 200mA Load Stable with 1µF Ceramic Capacitor for any Load Guaranteed 200mA Output Pull-Down Option in Shutdown (factory set) Extremely-Low Quiescent Current: 30µA Excellent Load/Line Transient Overcurrent and Thermal Protection 6-bump WLP Package 3 Applications The devices are ideal for mobile phones, wireless phones, PDAs, handheld computers, mobile phone base stations, Bluetooth portable radios and accessories, wireless LANs, digital cameras, personal audio devices, and any other portable, battery-powered application. Figure 1. AS1374 - Typical Application Circuit Input 2V to 5.5V CIN 1µF 2 VDD 3 OUT 1 Output1 1.2V to 3.6V COUT1 1µF 6 EN 1 AS1374 1 OUT 2 COUT2 1µF Output2 1.2V to 3.6V 4 EN 2 5 GND www.austriamicrosystems.com Revision 1.03 1 - 14 AS1374 Datasheet - P i n o u t 4 Pinout Pin Assignments Figure 2. Pin Assignments (Top View) 1 2 3 AS1374 4 5 6 Pin Descriptions Table 1. Pin Descriptions Pin Number 1 2 3 4 5 6 Pin Name OUT 2 VDD OUT 1 EN 2 GND EN 1 Description Regulated Output Voltage 2. Bypass this pin with a capacitor to GND. See Capacitor Selection and Regulator Stability on page 11 for more details. Input Supply Regulated Output Voltage 1. Bypass this pin with a capacitor to GND. See Capacitor Selection and Regulator Stability on page 11 for more details. Enable 2. Pull this pin to logic low to disable Regulated Output 2 voltage. Ground Enable 1. Pull this pin to logic low to disable Regulated Output 1 voltage. www.austriamicrosystems.com Revision 1.03 2 - 14 AS1374 Datasheet - A b s o l u t e M a x i m u m R a t i n g s 5 Absolute Maximum Ratings Stresses beyond those listed in Table 2 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 in Electrical Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 2. Absolute Maximum Ratings Parameter VDD to GND OUT 1, OUT 2, EN 1, EN 2 to GND Output Short-Circuit Duration ESD Latch-Up Thermal Resistance ΘJA Operating Temperature Range Junction Temperature Storage Temperature Range -65 -40 2 100 201.7 +85 +150 +150 Min -0.3 -0.3 Max +7 VDD + 0.3 Infinite kV mA ºC/W ºC ºC ºC The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/JEDEC J-STD-020D “Moisture/Reflow Sensitivity Classification for Non-Hermetic Solid State Surface Mount Devices”. The lead finish for Pb-free leaded packages is matte tin (100% Sn). HBM MIL-Std. 883E 3015.7 methods @85°C, JEDEC 78 on PCB Units V V Comments Package Body Temperature +260 ºC www.austriamicrosystems.com Revision 1.03 3 - 14 AS1374 Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s 6 Electrical Characteristics VIN = VOUT + 0.5V, VOUT = 2.85V, CIN = COUT = 1µF, TAMB = -40°C to +85ºC (unless otherwise specified). Typ values are at TAMB = +25ºC. Table 3. Electrical Characteristics Symbol VIN ΔVOUT IOUT IGND ILIMIT Parameter Input Voltage Range IOUT = 1mA, TAMB = +25ºC Output Voltage Accuracy Maximum Output Current Ground Current Current Limit Dropout Voltage IQ VLNR VLDR ISHDN PSRR 1 Condition Min 2 -1 -1.5 -2.5 200 Typ Max 5.5 +1 +1.5 +2.5 Unit V % mA IOUT = 100µA to 200mA, TAMB = +25ºC IOUT = 100µA to 200mA each channel one channel on, IOUT = 50µA one channel on, IOUT = 200mA OUT = short 2.5V ≤ VOUT < 3V, IOUT = 100mA both channels on, IOUT = 0.05mA 25 30 210 300 60 30 50 0.02 0.0005 0.01 85 65 50 20 0.01 50 55 400 120 90 µA µA mA mV µA %/V %/mA Quiescent Current Line Regulation Load Regulation Shutdown Current Ripple Rejection Output Noise Voltage (RMS) both channels on, VIN = VOUTNOM - 0.1V, IOUT = 0mA VIN = (VOUT +0.5V) to 5.5V, IOUT = 1mA IOUT = 1 to 200mA OUT 1 and OUT 2 disable f = 1kHz, IOUT = 10mA f = 10kHz, IOUT = 10mA f = 100kHz, IOUT = 10mA f = 100Hz to 100kHz, ILOAD = 20mA 2 µA dB µV µA µs Enable Enable Input Bias Current Enable Exit Delay 2 both channels initially off one channel initially off 1.4 150 200 0.4 Enable Logic Low Level Enable Logic High Level Thermal Protection TSHDN ΔTSHDN Thermal Shutdown Temperature Thermal Shutdown Hysteresis 160 15 V V ºC ºC 1. Dropout is defined as VIN - VOUT when VOUT is 100mV below the value of VOUT for VIN = VOUT + 0.5V. 2. Time needed for VOUT to reach 90% of final value. Note: All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods. www.austriamicrosystems.com Revision 1.03 4 - 14 AS1374 Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s 7 Typical Operating Characteristics VIN = VOUT + 0.5V, VOUT = 2.85V, CIN = COUT = 1µF, TAMB = 25°C (unless otherwise specified). Figure 3. Output Voltage vs. Temperature 2.88 2.87 Figure 4. Output Voltage vs. Input Voltage 2.88 2.87 Output Voltage (V) 2.86 2.85 2.84 2.83 CH1 CH2 Output Voltage (V) 2.86 2.85 2.84 Iload = 1mA 2.83 2.82 3.35 Iload = 10mA Iload = 100mA Iload = 200mA 2.82 -45 -30 -15 0 15 30 45 60 75 90 3.85 4.35 4.85 5.35 Temperature (°C) Figure 5. Output Voltage vs. Load Current 2.88 -40°C Input Voltage (V) Figure 6. Output Voltage vs. Input Voltage - Dropout 2.86 +25°C +85°C 2.87 2.84 Output Voltage (V) Output voltage (V) 2.86 2.85 2.84 2.83 2.82 2.81 2.8 0 25 50 75 100 125 150 175 200 2.82 2.8 2.78 2.76 Iload = 100mA 2.74 2.72 2.75 Iload = 200mA 2.8 2.85 2.9 2.95 3 3.05 Load Current (mA) Figure 7. Dropout Voltage vs. Load Current 150 125 Input Voltage (V) Figure 8. PSRR vs. Frequency 100 90 80 Dropout Voltage (V) PSRR (dB) -40°C +25°C +85°C 100 75 50 25 0 25 50 75 100 125 150 175 200 70 60 50 40 30 20 100 1000 10000 100000 Load Current (mA) www.austriamicrosystems.com Revision 1.03 Frequency (Hz) 5 - 14 AS1374 Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s Figure 9. Ground Pin Current vs. Load Current 33 32 Figure 10. Ground Pin Current vs. Temperature 30 Ground Pin Current (µA) 31 30 29 28 27 26 25 24 23 0 25 50 75 100 125 150 175 200 -40°C +25°C +85°C Ground Pin Current (µA) 29 28 27 26 25 -45 -30 -15 0 15 30 45 60 75 90 Load Current (mA) Temperature (°C) Figure 11. Ground Pin Current vs. Input Voltage; one Channel on, no Load 60 50 40 30 20 10 0 0 1 2 3 4 5 -40°C +25°C +85°C Figure 12. Ground Pin Current vs. Input Voltage; one Channel on, ILOAD = 200mA 60 50 40 30 20 10 0 3.35 -40°C +25°C +85°C Ground Pin Current (µA) Ground Pin Current (µA) 3.85 4.35 4.85 5.35 Input Voltage (V) Figure 13. Ground Pin Current vs. Input Voltage; both Channels on, no Load 100 90 Input Voltage (V) Figure 14. Ground Pin Current vs. Input Voltage; both Channels on, ILOAD = 200mA 100 90 Ground Pin Current (µA) 80 70 60 50 40 30 20 10 0 0 1 2 3 4 5 -40°C +25°C +85°C Ground Pin Current (µA) 80 70 60 50 40 30 20 10 0 3.35 3.85 4.35 4.85 -40°C +25°C +85°C 5.35 Input Voltage (V) www.austriamicrosystems.com Revision 1.03 Input Voltage (V) 6 - 14 AS1374 Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s Figure 15. Shutdown Current vs. Input Voltage 60 -40°C Figure 16. Load Regulation vs. Temperature 0 Shutdown Current (nA) 50 40 30 20 10 0 0.5 1 Load Regulation (% / mA) +25°C +85°C -0.0002 -0.0004 -0.0006 -0.0008 -0.001 -0.0012 -45 -30 -15 CH1 CH2 1.5 2 2.5 3 3.5 4 4.5 5 5.5 0 15 30 45 60 75 90 Input Voltage (V) Temperature (°C) Figure 17. Line Regulation vs. Load Current 0.2 0.15 Figure 18. Line Regulation vs. Temperature 0.2 0.15 Line Regulation (% / V) 0.1 0.05 0 -0.05 -0.1 -0.15 -0.2 0 25 50 75 100 125 150 175 200 -40°C +25°C +85°C Line Regulation (% / V) 0.1 0.05 0 -0.05 -0.1 -0.15 -0.2 -45 -30 -15 Iload = 1mA Iload = 10mA Iload = 100mA Iload = 200mA 0 15 30 45 60 75 90 Load Current (mA) Temperature (°C) Figure 19. Load Transient Response, Crosstalk, between CH1 and CH2, IOUT = 200mA Figure 20. Load Transient Response near Dropout, IOUT = 200mA 10mV/Div VOUT1 10mV/Div VOUT2 100mA/Div 20µs/Div 20µs/Div www.austriamicrosystems.com Revision 1.03 100mA/Div IOUT1 IOUT1 20mV/Div VOUT1 7 - 14 AS1374 Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s Figure 21. Line Transient Response Figure 22. Shutdown 10mV/Div VOUT1 VOUT1 500mV/Div VIN 100µs/Div 100µs/Div Figure 23. Startup of CH1 when CH2 is Off Figure 24. Startup of CH1 when CH2 is On 2V/Div 1V/Div VOUT1 100mA/Div VOUT1 20µs/Div 20µs/Div www.austriamicrosystems.com Revision 1.03 100mA/Div IIN IIN 1V/Div 2V/Div EN1 EN1 50mA/Div IOUT1 1V/Div 2V/Div EN1 8 - 14 AS1374 Datasheet - D e t a i l e d D e s c r i p t i o n 8 Detailed Description The AS1374 is an ultra-low-noise, low-dropout, low-quiescent current linear-regulator with two seperated outputs specifically designed for space-limited applications. These device can supply loads up to 200mA. As shown in Figure 25, the AS1374 consist of an integrated bandgap core, error amplifier, P-channel MOSFET pass transistor, and internal feedback voltage-divider. The output voltage is fed back through an internal resistor voltage-divider connected to pin OUT. Additional blocks include a current limiter, thermal sensor, and enable logic. Internal Voltage Reference The bandgap reference is connected to the error amplifier’s inverting input. The error amplifier compares this reference with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the pass-transistor gate is pulled low. This allows more current to pass to the output and increases the output voltage. If the feedback voltage is too high, the pass transistor gate is pulled high, allowing less current to pass to the output. Internal P-Channel Pass Transistor The AS1374 feature a 0.6Ω (typ) P-channel MOSFET pass transistor, which provides several advantages over similar designs using a PNP pass transistor, including prolonged battery life. The P-channel MOSFET does not require a base driver, thus quiescent current is dramatically reduced. The AS1374 do not exhibit problems associated with typical PNP-based LDOs, and consume only 30µA of quiescent current in light load and 50µA in dropout (see Typical Operating Characteristics on page 5). Output Voltage The AS1374 deliver preset output voltages from 1.2V to 3.6V, in 50mV increments (see Ordering Information on page 13). Enable The AS1374 feature an actice high enable mode to shutdown each output indepentend. Driving EN 1 low disables Output 1, driving EN 2 low disables Output 2. The disabled Output enters a high-impedance state. Figure 25. AS1374 - Block Diagram - EN 1 Enable Logic CH1 + OUT 1 Overcurrent Protection CH1 VDD Thermal Protection Common Logic Bandgap Trimmable Reference GND Overcurrent Protection CH2 EN 2 Enable Logic CH2 + - OUT 2 AS1374 www.austriamicrosystems.com Revision 1.03 9 - 14 AS1374 Datasheet - D e t a i l e d D e s c r i p t i o n Current Limit The AS1374 include a current limiting circuitry to monitor and control the P-channel MOSFET pass transistor’s gate voltage, thus limiting the device output current to 300mA. Note: See Table 3 on page 4 for the recommended min and max current limits. The output can be shorted to ground indefinitely without causing damage to the device. Thermal Protection Integrated thermal protection circuitry limits total power dissipation in the AS1374. When the junction temperature (TJ) exceeds +160ºC, the thermal sensor signals the shutdown logic, turning off the P-channel MOSFET pass transistor and allowing the device to cool down. The thermal sensor turns the pass transistor on again after the device’s junction temperature drops by 15ºC, resulting in a pulsed output during continuous thermal-overload conditions. Note: Thermal protection is designed to protect the devices in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction temperature rating of +150ºC. Operating Region and Power Dissipation The AS1374 maximum power dissipation is dependant on the thermal resistance of the case and PCB, the temperature difference between the die junction and TAMB, and airflow rate. Power dissipation across the device is calculated as: PD = IOUT (VIN - VOUT) (EQ 1) The maximum power dissipation is calculated: PDMAX = (TJ - TAMB)/θJA Where: TJ - TAMB is the temperature difference between the AS1374 die junction and the surrounding air; θJA is the thermal resistance through the circuit board, copper traces, and other materials to the surrounding. (EQ 2) www.austriamicrosystems.com Revision 1.03 10 - 14 AS1374 Datasheet - A p p l i c a t i o n I n f o r m a t i o n 9 Application Information Capacitor Selection and Regulator Stability For normal operation, use a 1µF capacitor at pin VDD and a 1µF capacitor at pin OUT. Larger input capacitor values and lower ESR provide better noise rejection and line-transient response. Reduce output noise and improve load-transient response, stability, and power-supply rejection by using large output capacitors. Note: Some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. With dielectrics such as Z5U and Y5V, it may be necessary to use a 2.2µF or larger output capacitor to ensure stability at temperatures below -10°C. With X7R or X5R dielectrics, 1µF is sufficient at all operating temperatures. Noise, PSRR, and Transient Response The AS1374 is designed to deliver ultra-low noise and high PSRR, as well as low dropout and low quiescent currents in battery-powered systems. The power-supply rejection is 85dB at 1kHz and 50dB at 100kHz. (see Figure 8 on page 5). When operating from sources other than batteries, improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output capacitors, and through passive filtering techniques. The Figure 19, Figure 20 on page 7 and Figure 21 on page 8 show the AS1374 Load- and Line- Transient Responses. Dropout Voltage The AS1374 minimum dropout voltage determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Since the AS1374 use a P-channel MOSFET pass transistor, the dropout voltage is a function of drain-to-source onresistance (RDS(ON)) multiplied by ILOAD (see Figure 7 on page 5). www.austriamicrosystems.com Revision 1.03 11 - 14 AS1374 Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s 10 Package Drawings and Markings The devices are available in a 6-bump WLP package. Figure 26. 6-bump WLP Package www.austriamicrosystems.com Revision 1.03 12 - 14 AS1374 Datasheet - O r d e r i n g I n f o r m a t i o n 11 Ordering Information The devices are available as the standard products shown in Table 4. Table 4. Ordering Information Ordering Code Marking Output Voltage 1 Output Voltage 2 Delivery Form Package AS1374-BWLT-285 AS1374-BWLT1833 AS1374-BWLT1218 ASSH ASSJ ASSK 2.85V 1.8V 1.2V 2.85V 3.3V 1.8V Tape and Reel Tape and Reel Tape and Reel 6-bump WLP 6-bump WLP 6-bump WLP Non-standard devices from 1.2V to 3.6V are available in 50mV steps. For more information and inquiries contact http://www.austriamicrosystems.com/contact Note: All products are RoHS compliant and Pb-free. Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect For further information and requests, please contact us mailto:sales@austriamicrosystems.com or find your local distributor at http://www.austriamicrosystems.com/distributor www.austriamicrosystems.com Revision 1.03 13 - 14 AS1374 Datasheet Copyrights Copyright © 1997-2009, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. 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