DATA SHEET AAT3237 300mA MicroPowerTM LDO with PowerOK General Description Features The AAT3237 MicroPower low dropout (LDO) linear regulator is ideally suited for portable applications where low noise, extended battery life, and small size are critical. The AAT3237 has been specifically designed for low output noise performance, fast transient response, and high power supply rejection ratio (PSRR). • Low Dropout: 400mV at 300mA • Guaranteed 300mA Output • High Accuracy ±1.5% • 70µA Quiescent Current • High Power Supply Ripple Rejection • Power-OK (POK) Output • Fast Line and Load Transient Response • Short-Circuit Protection • Over-Temperature Protection • Uses Low Equivalent Series Resistance (ESR) Ceramic Capacitors • Shutdown Mode for Longer Battery Life • Low Temperature Coefficient • 13 Factory-Programmed Output Voltages • SOT23 6-Pin or SC70JW 8-Pin Package Other features include low quiescent current, typically 70µA, and low dropout voltage, typically less than 400mV at full output current. The device is output shortcircuit protected and has a thermal shutdown circuit for additional protection under extreme conditions. The AAT3237 also features a low-power shutdown mode for extended battery life. A Power-OK open-drain output signals when VOUT is in regulation. The AAT3237 is available in a Pb-free, space-saving 6-pin SOT23 or 8-pin SC70JW package in 13 factoryprogrammed voltages: 1.2V, 1.5V, 1.8V, 2.0V, 2.3V, 2.5V, 2.7V, 2.8V, 2.85V, 2.9V, 3.0V, 3.3V, or 3.5V. Applications • Cellular Phones • Desktop Computers • Digital Cameras • Notebook Computers • Personal Portable Electronics • Portable Communication Devices Typical Application VIN IN ON/OFF AAT3237 EN GND 1µF VOUT OUT POK POK 2.2µF GND GND Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202257A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 9, 2012 1 DATA SHEET AAT3237 300mA MicroPowerTM LDO with PowerOK Pin Descriptions Pin Number Symbol SOT23-6 SC70JW-8 1 2, 5 5, 6 8 IN GND 3 7 EN 4 1 POK 6 2, 3, 4 OUT Function Input voltage pin; should be decoupled with 1µF or greater capacitor. Ground connection pin. Enable pin; this pin should not be left floating. When pulled low, the PMOS pass transistor turns off and all internal circuitry enters low-power mode, consuming less than 1µA. Power-OK output. This open-drain output is low when OUT is out of regulation. Connect a pull-up resistor from POK to OUT. Output pin; should be decoupled with 2.2µF ceramic capacitor. Pin Configuration SOT23-6 (Top View) IN GND 2 EN 1 2 3 6 OUT 5 GND 4 POK SC70JW-8 (Top View) POK OUT OUT OUT 1 8 2 7 3 6 4 5 GND EN IN IN Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202257A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 9, 2012 DATA SHEET AAT3237 300mA MicroPowerTM LDO with PowerOK Absolute Maximum Ratings1 TA = 25°C, unless otherwise noted. Symbol Description VIN, POK VENIN(MAX) IOUT TJ TLEAD Input Voltage, POK Maximum EN to Input Voltage DC Output Current Operating Junction Temperature Range Maximum Soldering Temperature (at leads, 10 sec.) Value Units 6 0.3 PD/(VIN - VO) -40 to 150 300 mA Rating Units 150 667 °C/W mW Rating Units (VOUT + VDO) to 5.5 -40 to +85 V °C V °C Thermal Information2 Symbol QJA PD Description Maximum Thermal Resistance (SOT23-6, SC70JW-8) Maximum Power Dissipation (SOT23-6, SC70JW-8) Recommended Operating Conditions Symbol VIN T Description Input Voltage3 Ambient Temperature Range 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. 2. Mounted on a demo board. 3. To calculate minimum input voltage, use the following equation: VIN(MIN) = VOUT(MAX) + VDO(MAX) as long as VIN ≥ 2.5V. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202257A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 9, 2012 3 DATA SHEET AAT3237 300mA MicroPowerTM LDO with PowerOK Electrical Characteristics VIN = VOUT(NOM) + 1V for VOUT options greater than 1.5V. VIN = 2.5V for VOUT ≤ 1.5V. IOUT = 1mA, COUT = 2.2µF, CIN = 1µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C. Symbol VOUT IOUT VDO ISC IQ ISD DVOUT/ VOUT*DVIN Description Conditions Output Voltage Tolerance IOUT = 1mA to 300mA Output Current Dropout Voltage1, 2 Short-Circuit Current Ground Current Shutdown Current VOUT > 1.2V IOUT = 300mA VOUT < 0.4V VIN = 5V, No Load, EN = VIN VIN = 5V, EN = 0V Line Regulation3 VIN = VOUT + 1 to 5.0V DVOUT(line) Dynamic Line Regulation DVOUT(load) VEN(L) VEN(H) IEN VPOK VPOKHYS VPOK(OL) IPOK Dynamic Load Regulation Enable Threshold Low Enable Threshold High Leakage Current on Enable Pin POK Trip Threshold POK Hysteresis POK Output Voltage Low POK Output Leakage Current PSRR TSD THYS eN TC Power Supply Rejection Ratio Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis Output Noise Output Voltage Temperature Coefficient Min TA = 25°C TA = -40 to 85°C Typ -1.5 -2.5 300 400 600 70 VIN = VOUT + 1V to VOUT + 2V, IOUT = 300mA, TR/TF = 2µs IOUT = 1mA to 300mA, TR <5µs Max Units 1.5 2.5 % 600 mA mV mA 125 1 µA 0.09 %/V 5 mV 60 0.6 1.5 VEN = 5V VOUT Rising, TA = 25°C ISINK = 1mA VPOK < 5.5V, VOUT in Regulation 1kHz IOUT = 10mA 10kHz 1MHz 90 94 1 1 98 0.4 1 65 45 42 145 12 250 22 1. VDO is defined as VIN - VOUT when VOUT is 98% of nominal. 2. For VOUT < 2.1V, VDO = 2.5V - VOUT. 3. CIN = 10µF. 4 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202257A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 9, 2012 V µA % of VOUT V µA dB °C µVrms ppm/°C DATA SHEET AAT3237 300mA MicroPowerTM LDO with PowerOK Typical Characteristics Unless otherwise noted, VIN = 5V, TA = 25°C. Dropout Characteristics Dropout Voltage vs. Temperature 3.20 IL = 300mA 480 Output Voltage (V) Dropout Voltage (mV) 540 420 360 300 IL = 100mA IL = 150mA 240 180 120 60 -40 -30 -20 -10 0 2.80 IOUT = 300mA IOUT = 150mA 2.60 2.40 IOUT = 10mA 2.20 IL = 50mA 0 IOUT = 0mA 3.00 2.00 2.70 10 20 30 40 50 60 70 80 90 100 110 120 2.80 Temperature (°C) 3.00 3.10 3.20 3.30 Ground Current vs. Input Voltage 90.00 500 80.00 Ground Current (µA) 450 Dropout Voltage (mV) 2.90 Input Voltage (V) Dropout Voltage vs. Output Current 400 350 300 85°C 250 200 25°C 150 -40°C 100 50 70.00 60.00 0 50 100 150 200 250 IOUT = 300mA 50.00 IOUT = 150mA IOUT = 50mA 40.00 IOUT = 0mA 30.00 IOUT = 10mA 20.00 10.00 0 0.00 300 2 2.5 3 3.5 4 4.5 Output Current (mA) Input Voltage (V) Quiescent Current vs. Temperature Output Voltage vs. Temperature 5 1.203 100 90 1.202 80 Output Voltage (V) Quiescent Current (µA) IOUT = 100mA IOUT = 50mA 70 60 50 40 30 20 10 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 Temperature (°C) 1.201 1.200 1.199 1.198 1.197 1.196 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 Temperature (°C) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202257A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 9, 2012 5 DATA SHEET AAT3237 300mA MicroPowerTM LDO with PowerOK Typical Characteristics Unless otherwise noted, VIN = 5V, TA = 25°C. Line Transient Response Turn-On Time and POK Delay 6 VENABLE (2V/div) 3.25 VIN VOUT (500mV/div) VPOK (500mV/div) 3.20 4 3.15 3 3.10 2 3.05 1 3.00 VOUT 0 2.95 -1 -2 Time (10µs/div) 300 2.75 200 2.70 100 IOUT 0 2.60 Output Voltage (V) Output Voltage (V) 2.80 2.65 Load Transient Response 300mA -100 Time (100µs/div) Over-Current Protection 3.00 800 2.90 700 2.80 2.70 600 VOUT 500 2.60 400 2.50 300 2.40 200 2.30 IOUT 100 2.20 0 2.10 -100 Time (10µs/div) AAT3237 Self Noise Noise Amplitude (µV/rtHz) Output Current (mA) 1200 1000 800 600 400 200 0 -200 Time (20ms/div) 10 1 0.1 0.01 0.01 0.1 1 10 100 Frequency (kHz) 6 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202257A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 9, 2012 1000 Output Current (mA) 400 VOUT Time (100µs/div) 500 Output Current (mA) 2.85 2.85 Load Transient Response 2.90 2.90 Output Voltage (V) Input Voltage (V) 5 DATA SHEET AAT3237 300mA MicroPowerTM LDO with PowerOK Typical Characteristics Unless otherwise noted, VIN = 5V, TA = 25°C. VEN(H) and V EN(L) vs. VIN 1.250 1.225 VEN (V) 1.200 1.175 VEN(H) 1.150 1.125 VEN(L) 1.100 1.075 1.050 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VIN (V) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202257A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 9, 2012 7 DATA SHEET AAT3237 300mA MicroPowerTM LDO with PowerOK Functional Block Diagram IN OUT Over-Current Protection Over-Temperature Protection Error Amplifier EN POK 94% Voltage Reference GND Functional Description The AAT3237 is intended for LDO regulator applications where output current load requirements range from no load to 300mA. The advanced circuit design of the AAT3237 provides excellent transient response and fast turn-on ability. The LDO regulator output has been specifically optimized to function with low-cost, low-ESR ceramic capacitors. However, the design will allow for operation over a wide range of capacitor types. The AAT3237 has an integrated Power-OK comparator which indicates when the output is out of regulation. 8 The device enable circuit is provided to shut down the LDO regulator for power conservation in portable products. The enable circuit has an additional output capacitor discharge circuit to assure sharp application circuit turn-off upon device shutdown. This LDO regulator has complete short-circuit and thermal protection. The integral combination of these two internal protection circuits gives the AAT3237 a comprehensive safety system during extreme adverse operating conditions. Device power dissipation is limited to the package type and thermal dissipation properties. Refer to the Thermal Considerations section of this datasheet for details on device operation at maximum output current loads. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202257A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 9, 2012 DATA SHEET AAT3237 300mA MicroPowerTM LDO with PowerOK Applications Information Capacitor Characteristics To assure the maximum possible performance is obtained from the AAT3237, please refer to the following application recommendations. Ceramic composition capacitors are highly recommended over all other types of capacitors for use with the AAT3237. Ceramic capacitors offer many advantages over their tantalum and aluminum electrolytic counterparts. A ceramic capacitor typically has very low ESR, is lower cost, has a smaller PCB footprint, and is nonpolarized. Line and load transient response of the LDO regulator is improved by using low ESR ceramic capacitors. Since ceramic capacitors are non-polarized, they are not prone to incorrect connection damage. Input Capacitor Typically, a 1µF or larger capacitor is recommended for CIN in most applications. A CIN capacitor is not required for basic LDO regulator operation. However, if the AAT3237 is physically located more than three centimeters from an input power source, a CIN capacitor will be needed for stable operation. CIN should be located as closely to the device VIN pin as practically possible. CIN values greater than 1µF will offer superior input line transient response and will assist in maximizing the highest possible power supply ripple rejection. Ceramic, tantalum, or aluminum electrolytic capacitors may be selected for CIN. There is no specific capacitor ESR requirement for CIN. However, for 300mA LDO regulator output operation, ceramic capacitors are recommended for CIN due to their inherent capability over tantalum capacitors to withstand input current surges from low impedance sources such as batteries in portable devices. Output Capacitor For proper load voltage regulation and operational stability, a capacitor is required between pins VOUT and GND. The COUT capacitor connection to the LDO regulator ground pin should be made as direct as practically possible for maximum device performance. The AAT3237 has been specifically designed to function with very low ESR ceramic capacitors. For best performance, ceramic capacitors are recommended. Typical output capacitor values for maximum output current conditions range from 1µF to 10µF. Applications utilizing the exceptionally low output noise and optimum power supply ripple rejection characteristics of the AAT3237 should use 2.2µF or greater for COUT. If desired, COUT may be increased without limit. In low output current applications where output load is less than 10mA, the minimum value for COUT can be as low as 0.47µF. Equivalent Series Resistance: ESR is a very important characteristic to consider when selecting a capacitor. ESR is the internal series resistance associated with a capacitor that includes lead resistance, internal connections, size and area, material composition, and ambient temperature. Typically, capacitor ESR is measured in milliohms for ceramic capacitors and can range to more than several ohms for tantalum or aluminum electrolytic capacitors. Ceramic Capacitor Materials: Ceramic capacitors less than 0.1µF are typically made from NPO or C0G materials. NPO and C0G materials generally have tight tolerance and are very stable over temperature. Larger capacitor values are usually composed of X7R, X5R, Z5U, or Y5V dielectric materials. These two material types are not recommended for use with LDO regulators since the capacitor tolerance can vary more than ±50% over the operating temperature range of the device. A 2.2µF Y5V capacitor could be reduced to 1µF over temperature; this could cause problems for circuit operation. X7R and X5R dielectrics are much more desirable. The temperature tolerance of X7R dielectric is better than ±15%. Capacitor area is another contributor to ESR. Capacitors that are physically large in size will have a lower ESR when compared to a smaller sized capacitor of an equivalent material and capacitance value. These larger devices can improve circuit transient response when compared to an equal value capacitor in a smaller package size. Consult capacitor vendor datasheets carefully when selecting capacitors for LDO regulators. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202257A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 9, 2012 9 DATA SHEET AAT3237 300mA MicroPowerTM LDO with PowerOK POK Output The AAT3237 features an integrated Power-OK comparator which can be used as an error flag. The POK opendrain output goes low when OUT is 6% below its nominal regulation voltage. Connect a pull-up resistor from POK to OUT. Enable Function The AAT3237 features an LDO regulator enable/disable function. This pin (EN) is active high and is compatible with CMOS logic. To assure the LDO regulator will switch on, the EN turn-on control level must be greater than 2.0V. The LDO regulator will go into the disable shutdown mode when the voltage on the EN pin falls below 0.6V. If the enable function is not needed in a specific application, it may be tied to VIN to keep the LDO regulator in a continuously on state. When the LDO regulator is in shutdown mode, an internal 1.5kW resistor is connected between VOUT and GND. This is intended to discharge COUT when the LDO regulator is disabled. The internal 1.5kW has no adverse effect on device turn-on time. Short-Circuit Protection The AAT3237 contains an internal short-circuit protection circuit that will trigger when the output load current exceeds the internal threshold limit. Under short-circuit conditions, the output of the LDO regulator will be current limited until the short-circuit condition is removed from the output or LDO regulator package power dissipation exceeds the device thermal limit. Thermal Protection The combination and interaction between the short-circuit and thermal protection systems allows the LDO regulator to withstand indefinite short-circuit conditions without sustaining permanent damage. No-Load Stability The AAT3237 is designed to maintain output voltage regulation and stability under operational no-load conditions. This is an important characteristic for applications where the output current may drop to zero. Reverse Output-to-Input Voltage Conditions and Protection Under normal operating conditions, a parasitic diode exists between the output and input of the LDO regulator. The input voltage should always remain greater than the output load voltage, maintaining a reverse bias on the internal parasitic diode. Conditions where VOUT might exceed VIN should be avoided since this would forward bias the internal parasitic diode and allow excessive current flow into the VOUT pin, possibly damaging the LDO regulator. In applications where there is a possibility of VOUT exceeding VIN for brief amounts of time during normal operation, the use of a larger value CIN capacitor is highly recommended. A larger value of CIN with respect to COUT will effect a slower CIN decay rate during shutdown, thus preventing VOUT from exceeding VIN. In applications where there is a greater danger of VOUT exceeding VIN for extended periods of time, it is recommended to place a Schottky diode across VIN to VOUT (connecting the cathode to VIN and anode to VOUT). The Schottky diode forward voltage should be less than 0.45V. The AAT3237 has an internal thermal protection circuit which will turn on when the device die temperature exceeds 145°C. The internal thermal protection circuit will actively turn off the LDO regulator output pass device to prevent the possibility of over-temperature damage. The LDO regulator output will remain in a shutdown state until the internal die temperature falls back below the 145°C trip point. 10 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202257A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 9, 2012 DATA SHEET AAT3237 300mA MicroPowerTM LDO with PowerOK Ordering Information Output Voltage Package 1.2V 1.5V 1.8V 2.0V 2.3V 2.5V 2.7V 3.3V 3.5V 1.2V 1.5V 1.8V 2.0V 2.3V 2.5V 2.7V 2.8V 2.85V 2.9V 3.0V 3.3V 3.5V SOT23-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SOT23-6 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 Marking1 HRXYY Part Number (Tape and Reel)2 AAT3237IGU-1.2-T1 AAT3237IGU-1.5-T1 AAT3237IGU-1.8-T1 AAT3237IGU-2.0-T1 AAT3237IGU-2.3-T1 AAT3237IGU-2.5-T1 AAT3237IGU-2.7-T1 AAT3237IGU-3.3-T1 AAT3237IGU-3.5-T1 AAT3237IJS-1.2-T1 AAT3237IJS-1.5-T1 AAT3237IJS-1.8-T1 AAT3237IJS-2.0-T1 AAT3237IJS-2.3-T1 AAT3237IJS-2.5-T1 AAT3237IJS-2.7-T1 AAT3237IJS-2.8-T1 AAT3237IJS-2.85-T1 AAT3237IJS-2.9-T1 AAT3237IJS-3.0-T1 AAT3237IJS-3.3-T1 AAT3237IJS-3.5-T1 Skyworks Green™ products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of Green™, document number SQ04-0074. 1. XYY = assembly and date code. 2. Sample stock is generally held on all part numbers listed in BOLD. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202257A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 9, 2012 11 DATA SHEET AAT3237 300mA MicroPowerTM LDO with PowerOK Package Information SOT23-6 2.85 ± 0.15 1.90 BSC 2.80 ± 0.20 0.15 ± 0.07 4° ± 4° 1.10 ± 0.20 1.20 ± 0.25 0.075 ± 0.075 1.575 ± 0.125 0.95 BSC 10° ± 5° 0.40 ± 0.10 × 6 0.60 REF 0.45 ± 0.15 GAUGE PLANE 0.10 BSC SC70JW-8 2.20 ± 0.20 1.75 ± 0.10 0.50 BSC 0.50 BSC 0.50 BSC 0.225 ± 0.075 2.00 ± 0.20 0.100 7° ± 3° 0.45 ± 0.10 4° ± 4° 0.05 ± 0.05 0.15 ± 0.05 1.10 MAX 0.85 ± 0.15 0.048REF 2.10 ± 0.30 All dimensions in millimeters. 12 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202257A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 9, 2012 DATA SHEET AAT3237 300mA MicroPowerTM LDO with PowerOK Copyright © 2012 Skyworks Solutions, Inc. 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Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters. Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202257A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 9, 2012 13