19-3048; Rev 2; 10/07 Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN The MAX1589 low-dropout linear regulator operates from a +1.62V to +3.6V supply and delivers a guaranteed 500mA continuous load current with a low 175mV dropout. The high-accuracy (±0.5%) output voltage is preset to internally trimmed voltages from +0.75V to +3.0V. An active-low, open-drain reset output remains asserted for at least 70ms after the output voltage reaches regulation. This device is offered in 6-pin thin SOT23 and 6-pin 3mm x 3mm thin DFN packages. An internal PMOS pass transistor maintains low supply current, independent of load and dropout voltage, making the MAX1589 ideal for portable battery-powered equipment such as personal digital assistants (PDAs), digital still cameras, cell phones, cordless phones, and notebook computers. Other features include logic-controlled shutdown, short-circuit protection, and thermaloverload protection. Applications Features ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ Low 1.62V Minimum Input Voltage Guaranteed 500mA Output Current ±0.5% Initial Accuracy Low 175mV Dropout at 500mA Load 70ms RESET Output Flag Supply Current Independent of Load and Dropout Voltage Logic-Controlled Shutdown Thermal-Overload and Short-Circuit Protection Preset Output Voltages (0.75V, 1.0V, 1.2V, 1.3V, 1.5V, 1.8V, 2.5V, and 3.0V) Tiny 6-Pin Thin SOT23 Package (<1.1mm High) Thin 6-Pin TDFN Package (<0.8mm High) Ordering Information PART* TEMP RANGE PIN-PACKAGE MAX1589EZT_ _ _-T -40°C to +85°C 6 Thin SOT23-6 MAX1589ETT_ _ _ -40°C to +85°C 6 TDFN *Insert the desired three-digit suffix (see the Selector Guide) into the blanks to complete the part number. Contact the factory for other output voltages. Selector Guide Notebook Computers Cellular and PCS Telephones Personal Digital Assistants (PDAs) TOP MARK VOUT (V) SUFFIX 0.75 075 AAAT AFJ 1.00 100 AAAU AFK 1.20 120 — ATM 1.30 130 AAAV AFL 1.50 150 AAAW AFM 1.80 180 AAAX AFN 2.50 250 AAAY AFO 3.00 300 AAAZ AFP Hand-Held Computers Digital Still Cameras PCMCIA Cards CD and MP3 Players SOT Pin Configurations Typical Operating Circuit INPUT 1.62V TO 3.6V OUTPUT 500mA 0.75V TO 3.0V CIN 1μF IN OUT MAX1589 COUT 4.7μF TOP VIEW IN 1 GND 2 6 OUT 5 I.C. MAX1589 ON SHDN RESET 1 I.C. 2 RESET 3 MAX1589 6 IN 5 SHDN 4 GND TO μC SHDN OFF OUT LOGIC SUPPLY 100kΩ TDFN 3 4 RESET TDFN 3mm x 3mm GND THIN SOT23 ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. 1 MAX1589 General Description MAX1589 Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN ABSOLUTE MAXIMUM RATINGS IN, SHDN, RESET to GND .....................................-0.3V to +4.0V OUT to GND ................................................-0.3V to (VIN + 0.3V) Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (TA = +70°C) 6-Pin Thin SOT23 (derate 9.1mW/°C above +70°C) ....727mW 6-Pin TDFN (derate 24.4mW/°C above +70°C) .........1951mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ..................................................... +150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°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. ELECTRICAL CHARACTERISTICS (VIN = (VOUT + 0.5V) or VIN = 1.8V, whichever is greater; SHDN = IN, CIN = 1µF, COUT = 4.7µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Input Voltage Input Undervoltage Lockout SYMBOL CONDITIONS VIN VUVLO Output Voltage Accuracy MIN UNITS 3.60 V V 1.30 1.60 IOUT = 150mA, TA = +25°C -0.5 +0.5 IOUT = 1mA to 500mA, VIN = (VOUT + 0.5V) to +3.6V -1.5 +1.5 IOUT Continuous 500 Current Limit ILIM VOUT = 96% of nominal value 550 IQ MAX VIN rising (180mV typical hysteresis) Maximum Output Current Ground Current TYP 1.62 % mARMS 850 1150 No load 70 140 IOUT = 500mA 90 Dropout (Note 2) 70 mA µA Dropout Voltage VIN - VOUT IOUT = 500mA, VOUT ≥ 1.8V (Note 2) 175 350 Load Regulation ΔVLDR IOUT = 1mA to 500mA 0.02 0.5 % Line Regulation ΔVLNR VIN = (VOUT + 0.5V) to +3.6V, IOUT = 100mA +0.01 +0.15 %/V -0.15 mV Output Noise 10Hz to 100kHz, IOUT = 10mA 86 µVRMS PSRR f < 1kHz, IOUT = 10mA 70 dB SHUTDOWN Shutdown Supply Current SHDN Input Logic Levels SHDN Input Bias Current IOFF SHDN = GND VIH VIN = 1.62V to 3.6V VIL VIN = 1.62V to 3.6V ISHDN V SH DN = 0 or 3.6V TA = +25°C 0.001 TA = +85°C 0.01 1.4 0.6 TA = +25°C 1 TA = +85°C 5 From SHDN high to OUT high, VOUT = 1.5V Turn-On Delay 1 300 90 µA V nA µs RESET OUTPUT VOUT falling (1.7% typical hysteresis) Reset Threshold Accuracy RESET Output Low Voltage 2 VOL I RESET = 100µA VIN = +1.0V, I RESET = 100µA 80 82.5 85 1.5 100 3 100 _______________________________________________________________________________________ %VOUT mV Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN (VIN = (VOUT + 0.5V) or VIN = 1.8V, whichever is greater; SHDN = IN, CIN = 1µF, COUT = 4.7µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS TYP MAX TA = +25°C MIN 0.001 1 TA = +85°C 0.01 RESET Output High Leakage Current IOH V RESET = 3.6V, RESET not asserted Reset Delay tRP From VOUT high to RESET rising 70 100 UNITS µA 160 ms THERMAL PROTECTION Thermal-Shutdown Temperature Thermal-Shutdown Hysteresis T SHDN +165 °C ΔT SHDN 15 °C Note 1: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design. Note 2: The dropout voltage is defined as VIN - VOUT, when VOUT is 4% lower than the value of VOUT when VIN = VOUT + 0.5V. Typical Operating Characteristics (VIN = (VOUT + 0.5V) or 1.8V, whichever is greater; SHDN = IN, CIN = 1µF, COUT = 4.7µF, TA = +25°C, unless otherwise noted.) VOUT = +1.5V 0 VOUT = +3.0V -0.1 VOUT = +0.75V 0.25 IOUT = 0mA 0 IOUT = 100mA -0.25 IOUT = 500mA 100 200 300 400 VOUT = +1.5V 1.0 0.5 IOUT = 0mA, 100mA, 500mA 0 -0.5 -1.0 -1.5 1.4 500 1.8 2.2 2.6 3.0 -40 3.4 -15 10 35 60 LOAD CURRENT (mA) INPUT VOLTAGE (V) TEMPERATURE (°C) GROUND-PIN CURRENT vs. LOAD CURRENT GROUND-PIN CURRENT vs. INPUT VOLTAGE GROUND-PIN CURRENT vs. TEMPERATURE VOUT = +1.5V 90 VOUT = +0.75V 80 IOUT = 500mA 100 80 60 IOUT = 0mA 40 VOUT = +1.5V 90 IOUT = 1mA TO 500mA 80 70 IOUT = 0mA 60 20 70 100 85 MAX1589 toc06 IOUT = 100mA GROUND-PIN CURRENT (μA) 100 MAX1589 toc05 VOUT = +3.0V 110 120 GROUND-PIN CURRENT (μA) 120 MAX1589 toc04 0 MAX1589 toc03 1.5 -0.50 -0.2 GROUND-PIN CURRENT (μA) MAX1589 toc02 VOUT = +1.5V OUTPUT VOLTAGE ACCURACY (%) 0.1 0.50 OUTPUT VOLTAGE ACCURACY (%) MAX1589 toc01 OUTPUT VOLTAGE ACCURACY (%) 0.2 OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE OUTPUT VOLTAGE ACCURACY vs. INPUT VOLTAGE OUTPUT VOLTAGE ACCURACY vs. LOAD CURRENT VOUT = +1.5V 50 0 60 0.01 0.1 1 10 LOAD CURRENT (mA) 100 1000 1.2 1.6 2.0 2.4 2.8 INPUT VOLTAGE (V) 3.2 3.6 -40 -15 10 35 60 85 TEMPERATURE (°C) _______________________________________________________________________________________ 3 MAX1589 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (VIN = (VOUT + 0.5V) or 1.8V, whichever is greater; SHDN = IN, CIN = 1µF, COUT = 4.7µF, TA = +25°C, unless otherwise noted.) DROPOUT VOLTAGE vs. LOAD CURRENT POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 80 MAX1589 toc07 200 160 VOUT = +1.5V 70 VOUT = +0.75V 60 VOUT = +3.0V 120 VOUT = +1.8V VOUT = +3.0V 80 50 PSRR (dB) VDROPOUT (mV) MAX1589 Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN 40 30 20 40 10 0 IOUT = 10mA 0 0 100 200 300 400 500 0.1 1 10 1000 FREQUENCY (kHz) LINE-TRANSIENT RESPONSE LINE-TRANSIENT RESPONSE NEAR DROPOUT MAX1589 toc09 MAX1589 toc10 2.5V 4V VIN 500mV/div VIN 3.5V 500mV/div 1.8V VOUT 1.5V ILOAD = 100mA VOUT = 1.5V VOUT 1.5V ILOAD = 100mA VOUT = 1.5V 10mV/div AC-COUPLED 40μs/div 10mV/div AC-COUPLED 40μs/div LOAD-TRANSIENT RESPONSE LOAD-TRANSIENT RESPONSE MAX1589 toc11 MAX1589 toc12 200mA IOUT 20mA 200mA/div VOUT 0 20mV/div AC-COUPLED VIN = 1.8V VOUT = 1.5V 4 100 LOAD CURRENT (mA) 20μs/div 500mA IOUT 100mA 500mA/div VOUT 50mV/div AC-COUPLED VIN = 3.6V VOUT = 1.5V 20μs/div _______________________________________________________________________________________ Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN SHUTDOWN RESPONSE SHUTDOWN/RESET RESPONSE MAX1589 toc13 MAX1589 toc14 RL = 25Ω VOUT = 1.5V RL = 25Ω VOUT = 1.5V 1V/div VSHDN 1V/div VSHDN 0 0 VOUT VOUT 0 1V/div 0 1V/div VRESET 500mV/div 0 100μs/div 40ms/div LINE/RESET RESPONSE MAX1589 toc15 RL = 25Ω VOUT = 1.5V 2V/div VIN 0 1V/div VOUT 0 VRESET 1V/div 0 200ms/div _______________________________________________________________________________________ 5 MAX1589 Typical Operating Characteristics (continued) (VIN = (VOUT + 0.5V) or 1.8V, whichever is greater; SHDN = IN, CIN = 1µF, COUT = 4.7µF, TA = +25°C, unless otherwise noted.) Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN MAX1589 Pin Description PART NAME FUNCTION SOT23 TDFN 1 6 IN 2 — GND Ground. GND also functions as a heatsink. Solder GND to a large pad or circuit-board ground plane to maximize SOT23 power dissipation. — 4 GND Ground 3 5 SHDN Active-Low Shutdown Input. A logic low reduces supply current to below 1µA. Connect to IN or logic high for normal operation. 4 3 RESET Active-Low, Open-Drain Reset Output. RESET rises 100ms after the output has achieved regulation. RESET falls immediately if VOUT drops below 82.5% of its nominal voltage, or if the MAX1589 is shut down. 5 2 I.C. Internally Connected. Leave floating or connect to GND. 6 1 OUT Regulator Output. Sources up to 500mA. Bypass with a 4.7µF low-ESR ceramic capacitor to GND. — Exposed Pad EP Ground. EP also functions as a heatsink. Solder EP to a large pad or circuit-board ground plane to maximize TDFN power dissipation. Regulator Input. Supply voltage can range from +1.62V to +3.6V. Bypass IN with at least a 1µF ceramic capacitor to GND (see the Capacitor Selection and Regulator Stability section). Detailed Description The MAX1589 is a low-dropout, low-quiescent-current, high-accuracy linear regulator designed primarily for battery-powered applications. The device supplies loads up to 500mA and is available with preset output voltages from +0.75V to +3.0V. As illustrated in Figure 1, the MAX1589 contains a reference, an error amplifier, a P-channel pass transistor, an internal feedback voltagedivider, and a power-good comparator. The error amplifier compares the 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 lower, allowing more current to pass to the output and increasing the output voltage. If the feedback voltage is too high, the passtransistor gate is pulled up, allowing less current to pass to the output. Internal P-Channel Pass Transistor The MAX1589 features a 0.33Ω (RDS(ON)) P-channel MOSFET pass transistor. Unlike similar designs using PNP pass transistors, P-channel MOSFETs require no base drive, which reduces quiescent current. PNPbased regulators also waste considerable current in dropout when the pass transistor saturates and use high base-drive currents under large loads. The 6 MAX1589 does not suffer from these problems and consumes only 90µA (typ) of quiescent current under heavy loads, as well as in dropout. Shutdown Pull SHDN low to enter shutdown. During shutdown, the output is disconnected from the input, an internal 1.5kΩ resistor pulls OUT to GND, RESET is actively pulled low, and supply current drops below 1µA. RESET Output The MAX1589’s microprocessor (µP) supervisory circuitry asserts a guaranteed logic-low reset during power-up, power-down, and brownout conditions down to +1V. RESET asserts when VOUT is below the reset threshold and remains asserted for at least 70ms (tRP) after VOUT rises above the reset threshold. Current Limit The MAX1589 monitors and controls the pass transistor’s gate voltage, limiting the output current to 850mA (typ). If the output current exceeds ILIM, the MAX1589 output voltage drops. Thermal-Overload Protection Thermal-overload protection limits total power dissipation in the MAX1589. When the junction temperature exceeds +165°C, a thermal sensor turns off the pass _______________________________________________________________________________________ Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN MAX1589 IN SHDN MOS DRIVER WITH ILIMIT ERROR AMP SHUTDOWN LOGIC P OUT MAX1589 POWER-GOOD COMPARATOR THERMAL SENSOR REF 82.5% REF RESET 100ms TIMER GND Figure 1. Functional Diagram transistor, allowing the IC to cool. The thermal sensor turns the pass transistor on again after the junction temperature cools by 15°C, resulting in a pulsed output during continuous thermal-overload conditions. Thermal-overload protection safeguards the MAX1589 in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junctiontemperature rating of +150°C. Operating Region and Power Dissipation The MAX1589’s maximum power dissipation depends on the thermal resistance of the IC package and circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. The power dissipated in the device is P = IOUT ✕ (VIN VOUT). The maximum allowed power dissipation is: PMAX = (TJ(MAX) - TA) / (θJC + θCA) where TJ(MAX) - TA is the temperature difference between the MAX1589 die junction and the surrounding air, θJC is the thermal resistance of the junction to the case, and θCA is the thermal resistance from the case through the PC board, copper traces, and other materials to the surrounding air. Typical thermal resistance (θJC + θJA) for a device mounted to a 1in square, 1oz copper pad is 41°C/W for the 3mm x 3mm TDFN package, and 110°C/W for the 6-pin thin SOT23 package. For best heatsinking, expand the copper connected to GND, or the exposed paddle. The MAX1589 delivers up to 500mA and operates with an input voltage up to +3.6V. However, when using the 6-pin SOT23 version, high output currents can only be sustained when the input-output differential voltage is low, as shown in Figure 2. The maximum allowed power dissipation for the 6-pin TDFN is 1.951W at TA = +70°C. Figure 3 shows that the maximum input-output differential voltage is not limited by the TDFN package power rating. Applications Information Capacitor Selection and Regulator Stability Capacitors are required at the MAX1589’s input and output for stable operation over the full temperature range and with load currents up to 500mA. Connect a 1µF ceramic capacitor between IN and GND and a 4.7µF low-ESR ceramic capacitor between OUT and GND. The input capacitor (C IN ) lowers the source impedance of the input supply. Use larger output _______________________________________________________________________________________ 7 MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE (POWER DISSIPATION LIMIT) TA = +85°C TA = +70°C 500 400 300 200 100 MAXIMUM RECOMMENDED OUTPUT CURRENT 6-PIN SOT23 600 MAXIMUM OUTPUT CURRENT (mA) MAXIMUM OUTPUT CURRENT (mA) 600 MAX1589 fig02 MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE (POWER DISSIPATION LIMIT) TA = +85°C 500 MAX1589 fig03 MAX1589 Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN 400 300 200 100 MAXIMUM RECOMMENDED OUTPUT CURRENT 6-PIN TDFN 0 0 0 0.5 1.0 1.5 2.0 2.5 3.0 (VIN - VOUT) (V) 0 0.5 1.0 1.5 2.0 2.5 3.0 (VIN - VOUT) (V) Figure 2. Power Operating Regions for 6-Pin SOT23: Maximum Output Current vs. Input Voltage Figure 3. Power Operating Region for 6-Pin TDFN: Maximum Output Current vs. Input Voltage capacitors to reduce noise and improve load-transient response, stability, and power-supply rejection. The output capacitor’s equivalent series resistance (ESR) affects stability and output noise. Use output capacitors with an ESR of 30mΩ or less to ensure stability and optimize transient response. Surface-mount ceramic capacitors have very low ESR and are commonly available in values up to 10µF. Connect CIN and COUT as close to the MAX1589 as possible to minimize the impact of PC board trace inductance. the output response: a near-zero DC shift from the output impedance due to the load-current change, and the transient response. A typical transient response for a step change in the load current from 100mA to 500mA is 35mV. Increasing the output capacitor’s value and decreasing the ESR attenuates the overshoot. Noise, PSRR, and Transient Response The MAX1589 is designed to operate with low dropout voltages and low quiescent currents in battery-powered systems, while still maintaining good noise, transient response, and AC rejection. See the Typical Operating Characteristics for a plot of Power-Supply Rejection Ratio (PSRR) vs. Frequency. When operating from noisy sources, improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output bypass capacitors and through passive filtering techniques. The MAX1589 load-transient response (see the Typical Operating Characteristics) shows two components of 8 Input-Output (Dropout) Voltage A regulator’s minimum input-output voltage difference (dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Because the MAX1589 uses a P-channel MOSFET pass transistor, its dropout voltage is a function of drain-to-source on-resistance (RDS(ON) = 0.33Ω) multiplied by the load current (see the Typical Operating Characteristics): VDROPOUT = VIN - VOUT = 0.33Ω ✕ IOUT The MAX1589 ground current reduces to 70µA in dropout. Chip Information TRANSISTOR COUNT: 2556 PROCESS: BiCMOS _______________________________________________________________________________________ Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN 6L THIN SOT23.EPS _______________________________________________________________________________________ 9 MAX1589 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) MAX1589 Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 10 ______________________________________________________________________________________ Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN 6, 8, &10L, DFN THIN.EPS ______________________________________________________________________________________ 11 MAX1589 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) MAX1589 Low-Input-Voltage, 500mA LDO Regulator with RESET in SOT and TDFN Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) COMMON DIMENSIONS PACKAGE VARIATIONS SYMBOL MIN. MAX. PKG. CODE N D2 E2 e JEDEC SPEC b [(N/2)-1] x e A 0.70 0.80 T633-2 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF D 2.90 3.10 T833-2 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF E 2.90 3.10 T833-3 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF A1 0.00 0.05 T1033-1 10 1.50±0.10 2.30±0.10 0.50 BSC MO229 / WEED-3 0.25±0.05 2.00 REF L 0.20 0.40 T1033-2 10 1.50±0.10 2.30±0.10 0.50 BSC MO229 / WEED-3 0.25±0.05 2.00 REF k 0.25 MIN. T1433-1 14 1.70±0.10 2.30±0.10 0.40 BSC ---- 0.20±0.05 2.40 REF A2 0.20 REF. T1433-2 14 1.70±0.10 2.30±0.10 0.40 BSC ---- 0.20±0.05 2.40 REF Revision History Pages changed at Rev 2: 1, 8–12 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.