SGM mA, Ultra Low Dropout, Low Power, RF Linear Regulators
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1 GENERAL DESCRIPTION The SGM2028 is a low-power, low-noise, low-dropout, CMOS linear voltage regulator that operates from a 2.5V to 5.5V input voltage. It is the perfect choice for low voltage, low power applications. A low ground current makes this part attractive for battery operated power systems. The SGM2028 also offers ultra low dropout voltage to prolong battery life in portable electronics. Systems requiring a quiet voltage source, such as RF applications, will benefit from the SGM2028 s ultra low output noise (30µV RMS ) and high PSRR. An external noise bypass capacitor connected to the device s BP pin can further reduce the noise level. Other features include output current limit and thermal shutdown protection. The SGM2028 is available in Green SOT-23-5 package. It operates over an ambient temperature range of -40 to +85. FEATURES 500mA Guaranteed Output Current Ultra Low Dropout Voltage Low Output Noise Thermal-Overload Protection Output Current Limit High PSRR (73dB at 1kHz) SGM , SGM and SGM2028-ADJ: 110kΩ Pull Down Resistor at EN Pin : No Pull Down Resistor at EN Pin Available Fixed Output Voltages: 2.8V, 3.0V and 3.3V Adjustable Output from 1.2V to 5.0V -40 to +85 Operating Temperature Range Available in Green SOT-23-5 Package APPLICATIONS Cellular Telephones Cordless Telephones PCMCIA Cards Modems MP3 Player Hand-Held Instruments Palmtop Computers Electronic Planners Portable/Battery-Powered Equipment REV. B. 3
2 PACKAGE/ORDERING INFORMATION MODEL V OUT (V) PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE ORDERING NUMBER PACKAGE MARKING PACKING OPTION SGM SOT to +85 SGM YN5G/TR S58XX Tape and Reel, 3000 SGM SOT to +85 SGM YN5G/TR G68XX Tape and Reel, SOT to +85 YN5G/TR S55XX Tape and Reel, 3000 SGM2028-ADJ ADJ SOT to +85 SGM2028-ADJYN5G/TR S4BXX Tape and Reel, 3000 NOTE: XX = Date Code. Green (RoHS & HSF): defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If you have additional comments or questions, please contact your SGMICRO representative directly. MARKING INFORMATION YYY X X Date code - Month ("A" = Jan. "B" = Feb. "L" = Dec.) Date code - Year ("A" = 2010, "B" = 2011 ) Chip I.D. For example: S55GJ (2016, October) ABSOLUTE MAXIMUM RATINGS IN to GND V to 6V Output Short-Circuit Duration... Infinite EN to GND V to (V IN +0.3V) OUT, BP/FB to GND V to (V IN + 0.3V) Power Dissipation, P T A = +25 SOT W Package Thermal Resistance SOT-23-5, θ JA /W Junction Temperature Storage Temperature Range to +150 Lead Temperature (Soldering, 10s) ESD Susceptibility HBM V MM V RECOMMENDED OPERATING CONDITIONS Input Voltage Range V to 5.5V Operating Temperature Range to +85 OVERSTRESS CAUTION Stresses beyond those listed may cause permanent damage to the device. Functional operation of the device at these or any other conditions beyond those indicated in the operational section of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. ESD SENSITIVITY CAUTION This integrated circuit can be damaged by ESD if you don t pay attention to ESD protection. SGMICRO recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. DISCLAIMER reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. 2
3 PIN CONFIGURATION (TOP VIEW) IN 1 5 OUT GND 2 EN 3 4 BP/FB SOT-23-5 PIN DESCRIPTION PIN NAME FUNCTION 1 IN Regulator Input. Supply voltage can range from 2.5V to 5.5V. Bypass with a 1μF capacitor to GND. 2 GND Ground. 3 EN BP 4 FB Shutdown Input. A logic low reduces the supply current to 10nA. Connect to IN for normal operation. Reference-Noise Bypass (fixed voltage version only). Bypass with a low-leakage 0.01μF ceramic capacitor for reduced noise at the output. Feedback Pin (adjustable voltage version only). This is used to set the output voltage of the device. 5 OUT Regulator Output. 3
4 ELECTRICAL CHARACTERISTICS (V IN = V OUT (NOMINAL) + 0.5V or 2.5V, whichever is greater, Full = -40 to +85. For SGM2028-ADJ, V OUT = 3.3V, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS TEMP MIN TYP MAX UNITS Input Voltage V IN V Output Voltage Accuracy I OUT = 0.1mA % Maximum Output Current (1) ma Current Limit I LIM ma Ground Pin Current I Q No Load, V EN = 2V µa Dropout Voltage (2) I OUT = 100mA I OUT = 300mA I OUT = 500mA Line Regulation ΔV LNR V IN = V OUT + 0.5V to 5.5V, I OUT = 1mA %/V Load Regulation ΔV LDR I OUT = 0.1mA to 500mA, C OUT = 1µF %/ma Output Voltage Noise Power Supply Rejection Ratio SHUTDOWN EN Input Threshold e n PSRR f = 10Hz to 100kHz, C BP = 0.01µF, C OUT = 10µF C BP = 0.1μF, I OUT = 50mA, C OUT = 1μF, V IN = V OUT + 1V mv µv RMS f = 217Hz db f = 1kHz db V IH Full 1.5 V IN = 2.5V to 5.5V V IL Full 0.3 Shutdown Supply Current I Q(SHDN) V EN = 0.3V μa Shutdown Exit Delay (3) C BP = 0.01μF, C OUT =1μF, No Load μs THERMAL PROTECTION Thermal Shutdown Temperature Thermal Shutdown Hysteresis T SHDN 150 ΔT SHDN 15 V NOTES: 1. Maximum output current is affected by PCB layout, size of metal trace, the thermal conduction path between metal layers and the environment of the system. 2. The dropout voltage is defined as V IN - V OUT, when V OUT is 100mV below the value of V OUT for V IN = V OUT + 0.5V. (Only applicable for V OUT = +2.5V to +5.0V.) 3. Time needed for V OUT to reach 90% of final value. 4
5 TYPICAL APPLICATION CIRCUITS INPUT 2.5V to 5.5V OUTPUT IN OUT INPUT 2.5V to 5.5V IN OUT OUTPUT C IN 1μF SGM 2028-ADJ R 1 C OUT 1μF C IN 1μF SGM2028 C OUT 1μF ON OFF EN GND FB R 2 ON OFF EN GND BP C BP 0.01μF NOTE: Choose R 2 = 47kΩ to maintain a 26μA minimum load. Calculate the value for R 1 using the following equation: V = 1.206V OUT R1 R2-1 5
6 TYPICAL PERFORMANCE CHARACTERISTICS V IN = V OUT (NOMINAL) + 0.5V or 2.5V, whichever is greater, C IN = 1μF, C OUT = 1μF, C BP = 0.01μF, T A = +25, unless otherwise noted. 6
7 TYPICAL PERFORMANCE CHARACTERISTICS (continued) V IN = V OUT (NOMINAL) + 0.5V or 2.5V, whichever is greater, C IN = 1μF, C OUT = 1μF, C BP = 0.01μF, T A = +25, unless otherwise noted. PSRR (db) Pow er Supply Rejection Ratio vs. Frequency C OUT = 10μF 60 C BP = 0.1μF 40 I LOAD = 50mA V IN = 4.3V to 4.4V V OUT = 3.3V C OUT = 1μF Frequency (khz) Dropout Voltage (mv) Dropout Voltage vs. Load Current T A = T A = T A = Load Current (ma) 3.5 Output Voltage vs. Load Current 4 Output Voltage vs. Input Voltage No Load Output Voltage (V) Load Current (ma) Output Voltage (V) Input Voltage (V) Ground Pin Current (µa) Ground Pin Current vs. Load Current Load Current (ma) Normalized Output Voltage Normalized Output Voltage vs. Temperature Normalized to T A = +25 I LOAD = 0.1mA Temperature ( ) 7
8 TYPICAL PERFORMANCE CHARACTERISTICS (continued) V IN = V OUT (NOMINAL) + 0.5V or 2.5V, whichever is greater, C IN = 1μF, C OUT = 1μF, C BP = 0.01μF, T A = +25, unless otherwise noted. Ground Pin Current (µa) Ground Pin Current vs. Input Voltage No Load Input Voltage (V) Ground Pin Current (μa) Ground Pin Current vs. Temperature 160 No Load Temperature ( ) 8
9 APPLICATION NOTE When LDO is used in handheld products, attention must be paid to voltage spikes which could damage SGM2028. In such applications, voltage spikes will be generated at charger interface and V BUS pin of USB interface when charger adapters and USB equipments are hot-plugged. Besides this, handheld products will be tested on the production line without battery. Test engineer will apply power from the connector pin which connects with positive pole of the battery. When external power supply is turned on suddenly, the voltage spikes will be generated at the battery connector. The voltage spikes will be very high, and it always exceeds the absolute maximum input voltage (6.0V) of LDO. In order to get robust design, design engineer needs to clear up this voltage spike. Zener diode is a cheap and effective solution to eliminate such voltage spike. For example, BZM55B5V6 is a 5.6V small package Zener diode which can be used to remove voltage spikes in cell phone designs. The schematic is shown below. Vcc Input BZM55B5V6 1μF C 1 IN EN SGM2028 GND BP OUT C 2 4.7μF V OUT 0.01μF Control 9
10 PACKAGE INFORMATION PACKAGE OUTLINE DIMENSIONS SOT-23-5 D 1.90 e1 E1 E b e RECOMMENDED LAND PATTERN (Unit: mm) L A A1 A2 θ 0.2 c Symbol Dimensions In Millimeters Dimensions In Inches MIN MAX MIN MAX A A A b c D E E e BSC BSC e BSC BSC L θ TX
11 PACKAGE INFORMATION TAPE AND REEL INFORMATION REEL DIMENSIONS TAPE DIMENSIONS P2 P0 W Q1 Q2 Q1 Q2 Q1 Q2 B0 Q3 Q4 Q3 Q4 Q3 Q4 Reel Diameter P1 A0 K0 Reel Width (W1) DIRECTION OF FEED NOTE: The picture is only for reference. Please make the object as the standard. KEY PARAMETER LIST OF TAPE AND REEL Package Type Reel Diameter Reel Width W1 A0 B0 K0 P0 P1 P2 W Pin1 Quadrant SOT Q3 DD0001 TX
12 PACKAGE INFORMATION CARTON BOX DIMENSIONS NOTE: The picture is only for reference. Please make the object as the standard. KEY PARAMETER LIST OF CARTON BOX Reel Type Length Width Height Pizza/Carton 7 (Option) DD0002 TX
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