PAM3105 0.5A Low Voltage- Low Dropout CMOS Regulator Key Features General Description n Low-Dropout Regulator Supports Input Voltages Down to 1.4V n Output Voltage Available in 0.9V, 1.0V, 1.2V, 1.5V,1.8V, 2.5V,2.8V,2.85V,3.0V,3.3V n Stable with a Ceramic Output Capacitor of 1.0uF or Higher n Low Dropout Voltage :50mV@ 0.5A n Low Quiescent Current n Over Temperature Shutdown n Low Temperature Coefficient n Pb-Free Package The PAM3105 is a 0.5A CMOS LDO regulator that features a low quiescent current, ultra low input, output and dropout voltages, as well as over temperature shutdown. It is available in a SOT-89 package. The fixed output voltage of the PAM3105 is set at the factory and trimmed to ± 2.0%. The device is stable with a ceramic output capacitor of 1.0uF or higher. This family of regulators can provide either a stand-alone power supply solution or act as a post regulator for switch mode power supplies. They are particularly well suited for applications requiring low input and output voltages. Applications n DSP, FPGA and Microprocessor Power Supplies n 1.2V Core Voltage for DSPs n LCD TV/ Monitors n Wireless Devices n Communication Devices n Portable Electronics n Post Regulator for SMPS Block Diagram Typical Application VIN VOUT VIN VOUT VIN VOUT PAM3105 C IN 4.7uF GND CO 2.2uF Thermal Shutdown R1 AMP R2 GND Power Analog Microelectronics , Inc www.poweranalog.com 08/2007 1 PAM3105 0.5A Low Voltage- Low Dropout CMOS Regulator Pin Configuration & Marking Information Top View SOT-89-3 V: Voltage Code X: Internal Code A: Assembly Code T: Testing Code Y:Year W: Weekly P3105 V XAT Y W 1 2 3 Pin Number 1 2 3 Name GND VIN VOUT Function Ground Input Output Absolute Maximum Ratings These are stress ratings only and functional operation is not implied . Exposure to absolute maximum ratings for prolonged time periods may affect device reliability . All voltages are with respect to ground . Storage Temperature..................... -65℃ to 150℃ Maximum Junction Temperature..................150℃ Soldering Temperature.......................300℃, 5sec Input Voltage...............................................4.0V Output Pin Voltage....................-0.3V to V IN +0.3V Operation Temperature Range........... -40℃ to 85℃ Operation Junction Temperature...... -40℃ to 125℃ Recommended Operating Conditions Junction Temperature Range.......... -40℃ to 125℃ Supply Voltage Range.......................1.4V to 3.6V Operation Temperature Range...........-40℃ to 85℃ Thermal Information Parameter Thermal Resistance (Junction to Case) Thermal Resistance (Junction to Ambient) Internal Power Dissipation Symbol Package Maximum θJC SOT-89-3 50 Unit ℃/W θJA SOT-89-3 180 PD SOT-89-3 550 mW Power Analog Microelectronics , Inc www.poweranalog.com 08/2007 2 PAM3105 0.5A Low Voltage- Low Dropout CMOS Regulator Electrical Characteristic V IN = V O+0.5V, T A=25 OC, C IN =4.7uF, C O=2.2uF, unless otherwise noted. Parameters Input Voltage Range Output Voltage Accuracy Symbol Test Conditions VIN Vo Io=50mA Ground Pin Current IGND UNITS Note 1 3.6 V -2 2 % 450 Vo=1.0V 220 350 2.5V>Vo≥1.2V 20 150 Vo≥2.5V 10 100 Vo=0.9V 330 500 Vo=1.0V 220 400 2.5V>Vo≥1.2V 50 200 Vo≥2.5V 40 150 Io=0mA 90 150 uA Io=1mA to 500mA 95 300 uA 0.1 1 %/V 0.2 1.5 % IO=500mA IQ MAX 330 VDROP Quiescent Current TYP Vo=0.9V IO=100mA Dropout Voltage MIN mV Vo≤2.5V,Io=10mA Line Regulation LNR VIN =Vo+0.5V to Vo+1.5V Vo>2.5V,Io=10mA VIN =3.3V to 3.6V Load Regulation Over Temperature Shutdown Over Temperature Hysteresis Temperature Coefficient Power Supply Ripple Rejection Output Noise LDR Io=1mA to 500mA, VIN =Vo+0.5V OTS 150 ℃ OTH 50 ℃ TC 40 ppm/℃ f=100Hz PSRR Io=100mA, Vo=0.9V f=1KHz f=10KHz Vn f=10Hz to 100kHz 65 60 dB 40 40 uVrms Note1: The minimum input voltage (V IN(MIN)) of the PAM3105 is determined by output voltage and dropout voltage. The minimum input voltage is defined as: V IN(MIN)=V O+V drop Power Analog Microelectronics , Inc www.poweranalog.com 08/2007 3 PAM3105 0.5A Low Voltage- Low Dropout CMOS Regulator Typical Performance Characteristics T A=25 OC, C IN =4.7uF, C O=2.2uF, unless otherwise noted. 1. Output Voltage vs Input Voltage Vo=0.9V 0.95 2. Output Voltage vs Output Current Vo=0.9V 0.95 0.9 Output Voltage(V) Output Voltage(V) 0.85 0.8 0.75 0.7 Io=1mA 0.65 0.6 Io=200mA 0.55 Io=500mA V IN=2.5V V IN=3.6V 0.9 0.875 V IN=1.4V 0.5 0.85 0.8 1.2 1.6 2 2.4 2.8 Input Voltage(V) 3.2 3.6 0 1.84 1.8 1.82 Output Voltage(V) 1.7 Io=1mA 1.5 1.4 1.3 200 300 400 500 Vo=1.8V 1.9 1.6 100 Output Current(mA) Vo=1.8V Output Voltage(V) 0.925 Io=500mA V IN=3.6V 1.8 V IN=3V 1.78 V IN=2.2V 1.76 1.74 1.2 1.72 Io=200mA 1.1 1.7 1 0.8 1.2 1.6 2 2.4 2.8 3.2 0 3.6 100 Input Voltage(V) Vo=3.3V 3.5 200 300 400 500 400 500 Output Current(mA) Vo=3.3V 3.35 3.3 Output voltage(V) Output Voltage(V) 3.33 3.1 2.9 Io=1mA 2.7 2.5 Io=200mA V IN=3.5V 3.31 3.29 V IN=3.6V 3.27 2.3 Io=500mA 2.1 3.25 2.2 2.5 2.8 3.1 3.4 3.7 4 0 Input voltage(V) 100 200 300 Output Current(mA) Power Analog Microelectronics , Inc www.poweranalog.com 08/2007 4 PAM3105 0.5A Low Voltage- Low Dropout CMOS Regulator Typical Performance Characteristics (continued) 4. Dropout Voltage vs Output Current Vo=0.9V 3. Output Voltage vs Temperature Vo=0.9V 0.92 450 400 Dropout Voltage(mV) Output Voltage(V) 0.91 V IN=2V,Io=10mA 0.9 0.89 V IN=2V,Io=200mA 0.88 0.87 350 300 250 200 150 0.86 100 25 50 75 100 125 0 100 Temperature(℃) Vo=1.8V 400 500 400 500 400 500 Vo=1.8V 70 V IN=3V,Io=200mA 60 Dropout Voltage(mV) 1.82 Output Voltage(V) 300 Output Current(mA) 1.84 1.8 1.78 200 V IN=3V,Io=10mA 1.76 1.74 50 40 30 20 10 1.72 0 1.7 25 50 75 100 0 125 100 200 300 Output Current(mA) Temperature(℃) Vo=3.3V 3.32 60 Dropout voltage(mV) 3.3 Output Voltage(V) Vo=3.3V 70 V IN=3.6V,Io=10mA 3.28 3.26 V IN=3.6V,Io=200mA 3.24 3.22 50 40 30 20 10 0 3.2 25 50 75 100 0 125 100 200 300 Output Current(mA) Temperature(℃) Power Analog Microelectronics , Inc www.poweranalog.com 08/2007 5 PAM3105 0.5A Low Voltage- Low Dropout CMOS Regulator Typical Performance Characteristics (continued) 5. Dropout Voltage vs Temperature 140 60 Quiescient Current(uA) Dropout Voltage @ 500mA(mV) 70 50 40 30 Vo=3.3V Vo=1.8V 20 10 6. Quiescent Current vs Input Voltage Vo=0.9V 120 100 80 60 40 20 0 25 50 75 100 125 0 0.8 Temptrature(℃) 1.2 1.6 2 2.4 2.8 3.2 3.6 Input Voltage(V) Vo=1.8V Vo=3.3V 180 110 Quiescent current(uA) Quiescient Current(uA) 120 100 90 80 70 60 160 140 120 100 Io=0mA 80 60 50 40 1.8 2.1 2.4 2.7 3 3.3 3.6 3.2 Input Voltage(V) 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 Input voltage(V) Power Analog Microelectronics , Inc www.poweranalog.com 08/2007 6 PAM3105 0.5A Low Voltage- Low Dropout CMOS Regulator Typical Performance Characteristics (continued) 140 7. Ground Current vs Input voltage Vo=0.9V 140 130 Ground Current(uA) 120 Ground Current(uA) 8. Ground Current vs Output Current Vo=0.9V 100 Io=500mA 80 60 Io=200mA 40 Io=1mA 120 110 100 VIN=3.6V 90 VIN=2.5V 80 70 20 VIN=3.3V 60 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 0 100 Input Voltage(V) 200 120 110 110 Ground Current(uA) Ground Current(uA) Vo=1.8V 120 Io=500mA Io=200mA 100 90 80 70 Io=1mA 60 400 500 400 500 400 500 Vo=1.8V V IN=3.6V 100 90 80 V IN=3V V IN=2.2V 70 60 50 50 1.8 2.1 2.4 2.7 3 3.3 3.6 0 100 Input Voltage(V) 200 300 Output Current(mA) Vo=3.3V 350 150 300 140 Ground Current(uA) Ground Current(uA) 300 Output Current(mA) 250 Io=500mA 200 Io=200mA 150 100 Vo=3.3V V IN=3.6V 130 120 110 V IN=3.5V 100 90 Io=1mA 50 3.2 3.3 3.4 80 3.5 3.6 0 Input Voltage(V) 100 200 300 Output Current(mA) Power Analog Microelectronics , Inc www.poweranalog.com 08/2007 7 PAM3105 0.5A Low Voltage- Low Dropout CMOS Regulator Typical Performance Characteristics (continued) 10. Line Transient Response 9. Load Transient Response Vin DC Coupling Io DC Coupling Vo AC Coupling Vo AC Coupling V IN=2.2V to 3.6V,Vo=1.8V,I O=1mA Io=1mA to 500mA,Vo=1.8V,V IN=3.3V Audio Precision 11. Power Supply Ripple Rejection +0 -10 -20 -30 Io DC Coupling d -40 B Io=500mA Io=100mA -50 Vo AC Coupling -60 -70 Io=1mA -80 10 Io=1mA to 100mA,Vo=1.8V, V IN=3.3V 20 50 100 200 500 1k 2k 5k 10k 20k 50k 100k Hz Vo=0.9V Io DC Coupling Vo AC Coupling Io=100mA to 500mA,Vo=1.8V, V IN=3.3V Power Analog Microelectronics , Inc www.poweranalog.com 08/2007 8 PAM3105 0.5A Low Voltage- Low Dropout CMOS Regulator Application Information T h e PA M 3 1 0 5 f a m i l y o f l o w - d r o p o u t ( L D O ) regulators have several features that allow them to apply to a wide range of applications. The family operates with very low input voltage (1.4V) and low dropout voltage (typically 50mV at full load), making it an efficient stand-alone power supply or post regulator for battery or switch mode power supplies. The 0.5A output current makes the PAM3105 family suitable for powering many microprocessors. The PAM3105 family also has low output noise (typically 40μVRMS with 2.2μF output capacitor), making it ideal for use in telecom equipment. generates is: Power=(V IN-V O)I O. All integrated circuits have a maximum allowable junction temperature (T J max) above which normal operation is not assured. A system designer must design the operating environment so that the operating junction temperature (T J) does not exceed the maximum junction temperature (TJ max). The two main environmental variables that a designer can use to improve thermal performance are air flow and external heatsinks. The purpose of this information is to aid the designer in determining the proper operating environment for a linear regulator that is operating at a specific power level. External Capacitor Requirements A 2.2μF or larger ceramic input bypass capacitor, connected between VIN and GND and located close to the PAM3105, is required for stability. A 1.0uF minimum value capacitor from VOUT to GND is also required. To improve transient response, noise rejection, and ripple rejection, an additional 10μF or larger,low ESR capacitor is recommended at the output. A higher value, low ESR output capacitor may be necessary if large, fast-rise-time load transients are anticipated and the device is located several inches from the power source, especially if the minimum input voltage of 1.4 V is used. In general, the maximum expected power (P D(max)) consumed by a linear regulator is computed as: PDMAX= (VI (avg)-VO (avg))×IO (avg)+VI (avg)×I (Q ) (1) Where: l V I (avg) is the average input voltage. l V O(avg) is the average output voltage. l I O(avg) is the average output current. l I (Q) is the quiescent current. Regulator Protection For most LDO regulators, the quiescent current is insignificant compared to the average output current; therefore, the term V I(avg) xI (Q) can be neglected. The operating junction temperature is computed by adding the ambient temperature (T A) and the increase in temperature due to the regulator' s power dissipation. The temperature rise is computed by multiplying the maximum expected power dissipation by the sum of the thermal resistances between the junction and the case ( R θJC), the case to heatsink (R θCS), and t h e h e a t s i n k t o a m b i e n t ( R θSA) . T h e r m a l resistances are measures of how effectively an object dissipates heat. Typically, the larger the device, the more surface area available for power dissipation so that the object 's thermal resistance will be lower. The PAM3105 features internal current limiting and thermal protection. During normal operation, the PAM3105 limits output current to approximately 1A. When current limiting engages, the output voltage scales back linearly until the over current condition ends. While current limiting is designed to prevent gross device failure, care should be taken not to exceed the power dissipation ratings of the package. If the temperature of the device exceeds 150°C, thermal-protection circuitry will shut it down. Once the device has cooled down to approximately 50°C below the high temp trip point, regulator operation resumes. Thermal Information The amount of heat that an LDO linear regulator Power Analog Microelectronics , Inc www.poweranalog.com 08/2007 9 PAM3105 0.5A Low Voltage- Low Dropout CMOS Regulator Ordering Information PAM3105 X X X X Output Voltage Number of Pins Package Type Pin Configuration Pin Configuration A Type Package Type Number of Pins C：SOT-89 A: 3 Output Voltage 090: 0.9V 1. GND 100: 1.0V 2. VIN 120: 1.2V 3. VOUT 150: 1.5V 180: 1.8V 250: 2.5V 280: 2.8V 285:2.85V 300: 3.0V 330: 3.3V Please consult PAM sales office or authorized Rep ./ Distributor for output voltage and package type availability . Power Analog Microelectronics , Inc www.poweranalog.com 08/2007 10 PAM3105 0.5A Low Voltage- Low Dropout CMOS Regulator Ordering Information Part Number Output Voltage PAM3105ACA090 0.9V PAM3105ACA100 1.0V PAM3105ACA120 1.2V PAM3105ACA150 1.5V PAM3105ACA180 1.8V PAM3105ACA250 2.5V PAM3105ACA280 2.8V PAM3105ACA285 2.85V PAM3105ACA300 3.0V PAM3105ACA330 3.3V Marking P3105Z XATYW P3105Y XATYW P3105B XATYW P3105C XATYW P3105E XATYW P3105G XATYW P3105H XATYW P3105I XATYW P3105J XATYW P3105K XATYW Package Type Standard Package SOT-89-3 1,000Units/Tape &Reel SOT-89-3 1,000Units/Tape &Reel SOT-89-3 1,000Units/Tape &Reel SOT-89-3 1,000Units/Tape &Reel SOT-89-3 1,000Units/Tape &Reel SOT-89-3 1,000Units/Tape &Reel SOT-89-3 1,000Units/Tape &Reel SOT-89-3 1,000Units/Tape &Reel SOT-89-3 1,000Units/Tape &Reel SOT-89-3 1,000Units/Tape &Reel Please consult PAM sales office or authorized Rep ./ Distributor for output voltage and package type availability . Power Analog Microelectronics , Inc www.poweranalog.com 08/2007 11 PAM3105 0.5A Low Voltage- Low Dropout CMOS Regulator Outline Dimension SOT - 89 - 3 4 . 5 0 . 05 1 . 650 REF 1 . 50 0 . 05 2 . 5 0 . 05 4 . 20 0 . 05 1 . 400 REF 6’ 1 . 00 0 . 07 1 . 50 0 . 46 0 . 025 0 . 38 0 . 01 1 . 50 3 . 00 0 . 025 6’-2X 6’-2X Ko T P2 Po Bo 12 ' Max D1 P1 B A A W F E Do B - B SECTION B ( Unit : mm ) 8 ' Max Ao A - A SECTION Symbol Ao Bo Ko Spec 4.85±0.1 4.45±0.1 1.85±0.1 Symbol E F Do Spec Po 4.0±0.1 D1 P1 P2 T 8.0±0.10 2.0±0.05 0.254±0.02 W 10Po 12.0+0.3 1.75±0.1 5.5±0.05 1.50±0.10 1.5±0.25 40.0±0.2 -0.1 Power Analog Microelectronics , Inc www.poweranalog.com 08/2007 12