MAX38902EATA+

EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX38902E 14µVRMS Low Noise 500mA LDO Linear Regulator General Description Benefits and Features The MAX38902E is low-noise linear regulator that delivers up to 500mA of output current with only 14µVRMS of output noise from 10Hz to 100kHz. This regulator maintains ±1% output accuracy over a wide input voltage range, requiring only 100mV of input-to-output headroom at full load. The 600µA no-load supply current is independent of dropout voltage. ● Delivers Flexible Operating Range • 1.7V to 5.5V Input Voltage Range • 0.8V to 5.0V Output Voltage Range • 500mA Maximum Output Current • 100mV Maximum Dropout at 500mA Load (3.6VIN) • < 0.1μA Shutdown Supply Current ● Reduces Noise and Improved Accuracy • 14uVRMS Output Noise, 10Hz to 100kHz • 600µA Operating Supply Current • 45dB PSRR at 100kHz • ±1% DC Accuracy Over Load, Line, and Temperature The MAX38902E has a resistor adjustable output voltage in the range of 0.8V to 5.0V and includes an active-low POK output. The device features a programmable output soft-start rate, output over-current and thermal overload protection. The MAX38902E is offered in an 8-pin TDFN package. ● Enables Easy-of-Use and Robust Protection • Minimum COUT 4μF • Programmable Soft-Start Rate • Overcurrent and Overtemperature Protection • Output-to-Input Reversed Current Protection • POK Output Applications ● Communication Circuitry ● Audio Systems ● High-Resolution Data Acquisition Systems ● Reduces Size, Improves Reliability • 2mm x 2mm 8-pin TDFN Package • -40ºC to 125ºC Operating Temperature Ordering Information appears at end of data sheet. Typical Operating Circuit IN (1.7V TO 5.5V) IN INS OUTPUT ADJUSTABLE 0.8V TO 5.0V OUT C1 10µF C2 10nF GND C3 10µF BYP R1 100k MAX38902E ENABLE ____ POK EN RESET R3 EP FB R2 19-100452; Rev 1; 1/19 MAX38902E 14µVRMS Low Noise 500mA LDO Linear Regulator Absolute Maximum Ratings IN, INS, OUT, EN, POK, FB, BYP to GND ............... -0.3V to +6V Output Short-Circuit Duration ..................................... Continuous Continuous Power Dissipation (TA = +70°C) ............................... TDFN (derate 9.8mW/°C above 70°C) ............................. 784mW Operating Temperature Range .......................... -40°C to +125°C Maximum Junction Temperature ...................................... +150°C Storage Temperature Range ..............................-65°C to +150°C Lead Temperature (Soldering, 10 seconds) .....................+300°C Soldering Temperature (reflow) ........................................ +260°C 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 in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Information TDFN Package Code T822+3C Outline Number 21-0168 Land Pattern Number 90-0065 Thermal Resistance, Single-Layer Board: Junction-to-Ambient (θJA) 130°C/W Junction-to-Case Thermal Resistance (θJC) 8°C/W Thermal Resistance, Four-Layer Board: Junction-to-Ambient (θJA) 102°C/W Junction-to-Case Thermal Resistance (θJC) 8°C/W For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/ thermal-tutorial. www.maximintegrated.com Maxim Integrated | 2 MAX38902E 14µVRMS Low Noise 500mA LDO Linear Regulator Electrical Characteristics (VIN = 3.6V, TJ = -40°C to +125°C, CBYP = 10nF, CIN = 10µF, COUT = 10µF, circuit of Typical Operating Circuit, typical values are at TJ = +25°C, unless otherwise specified. (Note 1)) PARAMETER Input Voltage Range Input Undervoltage Lockout SYMBOL VIN VIN_UVLO CONDITIONS 1.7 VIN rising, 100mV hysteresis 1.5 0.8 Output Voltage Range VOUT VIN > VOUT + 0.1V Output Capacitance COUT For stability and proper operation IQ Supply Current Feedback Accuracy ISHUTDOWN VFB MIN Guaranteed by Output Accuracy 4 IOUT = 0mA VEN = 0V TYP 1.6 MAX UNITS 5.5 V 1.7 V 5.0 10 600 1500 TJ = +25°C 0.01 0.1 TJ = +125°C 700 IOUT from 0.1mA to 500mA, VIN from VOUT + 0.3V to 5.5V, VIN > 1.7V, VOUT from 0.8V to 5.0V 0.594 0.6 V µF µA nA 0.606 V Load Regulation IOUT from 0.1mA to 500mA, VIN = VOUT + 300mV, VOUT = 2.5V 0.07 % Load Transient IOUT = 50mA to 500mA to 50mA, tRISE = tFALL = 1µs 50 mV Line Regulation VIN from VOUT + 0.3V to 5.5V, VIN > 1.7V, IOUT = 200mA 0.06 % Line Transient VIN = 4V to 5V to 4V, IOUT = 500mA, tRISE = tFALL = 5µs 3 mV Dropout Voltage (Note 2) IOUT = 500mA 50 100 mV Current Limit VFB = 0V, VIN - VOUT = 500mV 700 800 mA Output Noise IOUT = 100mA, 10Hz to 100kHz Power Supply Rejection Ratio BYP Capacitor Range PSRR CBYP IOUT = 100mA VIN = 3.6V 600 CBYP = 47nF 14 f = 1kHz 60 f = 10kHz 60 f = 100kHz 45 f = 1MHz 40 Regulator remains stable 0.001 From BYP to GND during startup EN Input Threshold VIN from 1.7V to 5.5V EN rising EN falling 0.4 0.7 EN Input Leakage Current VEN from 1.7V to 5.5V TJ = +25°C -1 +0.001 POK Threshold VOUT when POK switches VOUT rising POK Voltage, Low IPOK = 1mA POK Leakage Current VPOK = 5.5V www.maximintegrated.com 50 0.8 TJ = +125°C 88 91 1.2 +1 94 88 -0.1 10 100 +0.001 +0.1 0.01 µF µA 0.01 VOUT falling TJ = +125°C dB 0.1 BYP Soft-Start Current TJ = +25°C µVRMS V µA % mV µA Maxim Integrated | 3 MAX38902E 14µVRMS Low Noise 500mA LDO Linear Regulator Electrical Characteristics (continued) (VIN = 3.6V, TJ = -40°C to +125°C, CBYP = 10nF, CIN = 10µF, COUT = 10µF, circuit of Typical Operating Circuit, typical values are at TJ = +25°C, unless otherwise specified. (Note 1)) PARAMETER Thermal Shutdown Threshold SYMBOL CONDITIONS TJ when output turns on/off MIN TYP TJ rising 165 TJ falling 150 MAX UNITS °C Note 1: Limits over the specified operating temperature and supply voltage range are guaranteed by design and characterization, and production tested at TJ = 25ºC only. Note 2: Dropout voltage is defined as (VIN - VOUT), when VOUT is 95% of its nominal value. Typical Operating Characteristics (VIN = 3.6V, VOUT = 2.5V, TA = 25°C, CIN = 10µF , COUT = 10µF, unless otherwise noted.) www.maximintegrated.com Maxim Integrated | 4 MAX38902E 14µVRMS Low Noise 500mA LDO Linear Regulator Pin Configuration MAX38902E IN 1 GND + 8 OUT 2 7 BYP EN 3 6 FB INS 4 5 POK EXPOSED PAD Pin Description PIN NAME 1 IN 2 GND 3 EN Enable Input. Connect this pin to a logic signal to enable (VEN high) or disable (VEN low) the regulator output. Connect to IN to keep the output enabled whenever a valid supply voltage is present. 4 INS Input Sense Pin. Connect INS to IN. 5 POK Power-On Reset Output. Connect a pullup resistor from this pin to a supply to create a reset signal that goes low after the regulator output has reached its regulation voltage. 6 FB Feedback Divider Input. Connect a resistor divider string from OUT to GND with the mid-point tied to this pin to set the output voltage. In the Typical Application Circuit, VOUT = 0.6V x (1 + R3/R2). 7 BYP Bypass Capacitor Input. Connect a 0.001µF to 0.1µF capacitor between OUT and BYP to reduce output noise and set the regulator soft-start rate. 8 OUT Regulator Output. Sources up to 500mA at the output regulation voltage. Bypass with a 10µF (4µF minimum including voltage derating) low ESR (< 0.03Ω) capacitor to GND. EP EP www.maximintegrated.com FUNCTION Regulator Supply Input. Connect to a voltage between 1.7V and 5.5V and bypass with a 10µF capacitor from IN to GND. Regulator Ground. Bring IN and OUT bypass capacitor GND connections to this pin for best performance. Exposed Pad. Connect the exposed pad to a ground plane with low thermal resistance to ambient to provide best heat sinking. Maxim Integrated | 5 MAX38902E 14µVRMS Low Noise 500mA LDO Linear Regulator Functional Diagrams IN CURRENT LIMIT THERMAL PROTECTION INS EN REVERSE CURRENT PROTECTION CONTROL OUT BYP BYP REF 0.6V POK EA MAX38902E 0.54V FB GND www.maximintegrated.com Maxim Integrated | 6 MAX38902E 14µVRMS Low Noise 500mA LDO Linear Regulator Detailed Description The MAX38902E, low noise linear regulator delivers up to 500mA of output current, with only 14µVRMS of output noise in a 10Hz to100kHz bandwidth. This regulator maintains its output voltage over a wide input range, requiring only 100mV of input-to-output headroom at full load. The MAX38902E maintains a low 600µA typical supply current, independent of the load current and drop-out voltage. The regulator control circuitry includes a programmable soft-start circuit, short-circuit, reverse input current, and thermal overload protection. Other features include an enable input and power-okay (POK) output (see Typical Operating Circuit). Enable (EN) The MAX38902E includes an enable input (EN). Pull EN low to shut down the output, or drive EN high to enable the output. If a separate shutdown signal is not available, connect EN to IN. Bypass (BYP) The capacitor connected from BYP to OUT filters the noise of the reference, feedback resistors and regulator input stage, and provides a high-speed feedback path for improved transient response. A 0.01µF capacitor rolls-off input noise at around 32Hz. The slew rate of the output voltage during startup is also determined by the BYP capacitor. A 0.01µF capacitor sets the slew rate to 5V/ms. This startup rate results in a 50mA slew current drawn from the input at start-up to charge the 10µF output capacitance. The BYP capacitor value can be adjusted from 0.001µF to 0.1µF to change the startup slew rate according to the following formula: STARTUP SLEW RATE = 5V ms x 0.01 µ F CBYP where CBYP is in µF. Note that this slew rate applies only at startup. That recovery from a short-circuit will occur at a slew rate approximately 500 times slower. Also note that, being a low-frequency filter node, BYP is sensitive to leakage. BYP leakage currents above 10nA cause measurable inaccuracy at the output and should be avoided. Protection Features The MAX38902E is fully protected from an output short-circuit by a current-limiting and thermal overload circuit. If the output is shorted to GND, the output current is limited to 700mA (typ). Under these conditions, the part quickly heats up. When the junction temperature reaches 165°C, a thermal limit circuit shuts off the output device. When the junction cools to 150°C, the output turns back on in an attempt to reestablish regulation. While the fault persists, the output current cycles on and off, as the junction temperature slews between 150°C and 165°C. The MAX38902E is also protected against reverse current when the output voltage is higher than the input. In the event that extra output capacitance is used at the output, a power-down transient at the input would normally cause a large reverse current through a conventional regulator. The MAX38902E includes a reverse voltage detector that trips when IN drops 10mV below OUT, shutting off the regulator and opening the PMOS body diode connection, preventing any reverse current. www.maximintegrated.com Maxim Integrated | 7 MAX38902E 14µVRMS Low Noise 500mA LDO Linear Regulator Output Voltage Configuration The MAX38902E uses external feedback resistors to set the output regulation voltage, as shown in the Typical Operating Circuit. The output can be set from 0.8V to 5.0V. Set the lower feedback resistor R2 to 300kΩ or less to minimize FB input bias current error. Then, calculate the value of the upper feedback resistor R3 as follows: R3 = R2 x ( VOUT VFB −1 ) where VFB is the feedback regulation voltage of 0.6V. To set the output voltage to 2.5V, for example, R3 should be: R3 = 300kΩ x −1 ) ( 2.5V 0.6V Power-OK The MAX38902E includes an additional open-drain output, POK, that goes low to indicate the output voltage is in regulation. Connect a pullup resistor from this pin to an external supply. During startup, POK stays high until the output voltage rises to 91%(typ) of its regulation level. If an overload occurs at the output, or the output is shutdown, POK goes high. Input Capacitor A 10µF ceramic capacitor is recommended for the input. Select a capacitor that maintains its capacitance over temperature and DC bias. Capacitors with X5R or X7R temperature characteristics generally perform well. Output Capacitor A minimum of 4µF capacitance is required at OUT to ensure stability. Select a ceramic capacitor that maintains its capacitance (4µF minimum) over temperature and DC bias. Capacitors with X5R or X7R temperature characteristics generally perform well. Thermal Considerations The MAX38902E is packaged in an 8-pin 2mm x 2mm TDFN package with an exposed paddle. The exposed paddle is the main path for heat to leave the IC, and therefore must be connected to a ground plane with thermal vias to allow heat to dissipate from the device. Thermal properties of the IC package are given in the Package Information section. www.maximintegrated.com Maxim Integrated | 8 MAX38902E 14µVRMS Low Noise 500mA LDO Linear Regulator Ordering Information Part Number MAX38902EATA+ Temperature Range Pin-Package -40°C to +125°C 8 TDFN Output Voltage Setting External Resistor Feedback with POK output +Denotes a lead(Pb)-free/RoHS-compliant package. www.maximintegrated.com Maxim Integrated | 9 MAX38902E 14µVRMS Low Noise 500mA LDO Linear Regulator Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 12/18 Initial release 1 1/19 Updated Typical Operating Circuit, Absolute Maximum Ratings, Electrical Characteristics, Pin Configuration, Pin Description, and Functional Diagram DESCRIPTION — 1–3, 5, 6 For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2018 Maxim Integrated Products, Inc.