AMS3106 Micropower 500mA Low Noise Fast Transient Response LDO General Description Features The AMS3106 is a high performance linear regulator with very low dropout voltage and excellent transient response. It is designed to operate with wide input voltage range of 1.5 – 12Volts making it ideal for two step conversion while maintaining high efficiency for many power sensitive applications. The device is capable of supplying 500mA of output current with a typical dropout voltage of 425mV. The product is available in either fixed or adjustable output voltage. The linear regulator has been optimized for noise sensitive applications. The device includes an Enable pin for electrical on/off of the regulator. Forcing the Enable pin to logic low shuts down the LDO and reduces the supply current below 1µA. In addition, the AMS3106 provides an optional open collector Power Good (PG) signal to allow supply monitoring and sequencing of other supplies. The product includes complete short-circuit and thermal protection. The combination of these two internal protection circuits gives the device a comprehensive safety system to safe guard against extreme adverse operating conditions. The AMS3106 is available in SOT23-5 and thermally enhanced SOIC-8 EDP packages, and it is rated for -40°C to +125°C temperature range. • • • • • • • • • • • • • • • • VIN range: 1.5 – 12V Fixed and Adjustable output voltage as low as 0.6V 500mA maximum output current 425mV of typical dropout voltage Low self noise Enable (EN) pin for LDO on/off Optional Power Good (PG) output 120µA typical supply current Optional ByPass (CBYP) pin for low PSRR and output noise PSRR > 40dB at 10KHz Stable with Electrolytic, Tantalum or Ceramic capacitors Current Limit protection Over-Temperature Shutdown -40 to +125°C temperature range Available in SOIC-8 EDP and SOT23-5 packages RoHS & WEEE compliant Applications • • • • • • • • ASIC Power Supplies In: ¾ Set-top Boxes, Desktops, Notebooks ¾ Graphic Cards, Printers and Copiers DVD, Blue-Ray DVD writers LCD TVs and LCD monitors Infotainment Wireless & RF: applications DSP and FPGA Power Supplies Medical Instrumentation SMPS Post-Regulator Typical Application 02/11/2010 www.advanced-monolithic.com 1 Phone (925) 443-0722 Fax (925) 443-0723 AMS3106 Micropower 500mA Low Noise Fast Transient Response LDO Pin Description (SOIC-8 EDP package) Pin # Symbol 1 EN Enable pin. It controls the electrical on/off of the device. When connected to logic low, the device shuts off and consumes less than 1µA of current. Logic high will resume normal operation. 2 VIN Input supply Voltage. It powers the internal control circuitry and the internal power switch. Bypass VIN with at ceramic capacitor from this pin to ground. 3 VOUT Output Voltage BYP Reference Bypass pin. Connect an external capacitor from CBYP to ground to bypass the noise generated by the internal bandgap. This improves power supply rejection ratio and output noise. PG Power Good pin. It is an open collector, active high output that indicates the status of the output voltage. When output voltage (VOUT) exceeds the PG trip threshold, the PG pin goes in to a high impedance state. When the device is out of regulation or shutdown, the PG pin is pulled low. A 10KΩ to 1MΩ resistor should be connected from PG to VOUT. ADJ Provides feedback to error amplifier from the resistive divider that sets the output voltage. 5,6,7,8 GND Ground connection. 9 EDP Expose pad. Connected to PCB ground plane for good thermal dissipation. 4 Description Pin Configuration SOIC-8 EDP (Top View) EN 1 VIN 2 VOUT 3 BYP 4 02/11/2010 9 EDP 8 GND EN 1 7 GND VIN 2 6 GND VOUT 3 5 GND ADJ 4 www.advanced-monolithic.com 2 9 EDP 8 GND 7 GND 6 GND 5 GND Phone (925) 443-0722 Fax (925) 443-0723 AMS3106 Micropower 500mA Low Noise Fast Transient Response LDO Pin Description (SOT23-5 package) Pin # Symbol 1 VIN 2 GND 3 EN Enable pin. It controls the electrical on/off of the device. When connected to logic low, the device shuts off and consumes less than 1µA of current. Logic high will resume normal operation. BYP Reference Bypass pin. Connect an external capacitor from CBYP to ground to bypass the noise generated by the internal bandgap. This improves power supply rejection ratio and output noise. PG Power Good pin. It is an open collector, active high output that indicates the status of the output voltage. When output voltage (VOUT) exceeds the PG trip threshold, the PG pin goes in to a high impedance state. When the device is out of regulation or shutdown, the PG pin is pulled low. A 10KΩ to 1MΩ resistor should be connected from PG to VOUT. ADJ Provides feedback to error amplifier from the resistive divider that sets the output voltage. VOUT Output Voltage 4 5 Description Input supply Voltage. It powers the internal control circuitry and the internal power switch. Bypass VIN with at ceramic capacitor from this pin to ground. Ground connection. Pin Configuration SOT23-5 (Top View) 02/11/2010 www.advanced-monolithic.com 3 Phone (925) 443-0722 Fax (925) 443-0723 AMS3106 Micropower 500mA Low Noise Fast Transient Response LDO Absolute Maximum Ratings (1) Recommended Operating Conditions (2) Maximum Input Supply Voltage (VIN)………….....….… -0.3V to 15V Enable Voltage (EN)……………..…..………….……… -0.3V to 15V Power Good (PG).……………..…..…………….……… -0.3V to 15V Adjustable Voltage (ADJ)…………………………….…… -0.3V to 3V ByPass Voltage (BYP)…………..…..…………………… -0.3V to 3V Storage Temperature Range……………….............. -65⁰C to 150⁰C Lead Temperature…………………..………….………..……… 260⁰C Junction Temperature………...………………..……..………… 125⁰C Input Voltage……………………………………………….. 1.5V to 12V Ambient Operating Temperature……………....…… -40⁰C to 125⁰C Thermal Information (3) 8L SOIC EP θJA …………………………………….….…...45⁰C/W (3) .............................................................220⁰C/W 5L SOT23.... θJA Electrical Characteristics Unless otherwise noted: VIN=3.3V, VOUT=1.8V; CIN=10 µF, COUT=22µF, -40⁰C≤TA=TJ≤85⁰C, TJ(Max.)=125°C; Typical values are TA=25°C Parameter Output Voltage Accuracy AMS3106A-X Output Voltage Accuracy AMS3106-X Symbol VOUT VOUT Adjustable Voltage VADJ Adjustable Voltage VADJ Adjustable bias current Maximum Output Current Load Regulation IADJ_Bias IOUT_Max Line Regulation Supply Current Shutdown Current Current Limit ISUP ISHDN ILIM Dropout Voltage VDO ΔVOUT/ΔVIN PSRR Output Noise Voltage Enable Threshold Low Enable Threshold High Input Enable Low Current Input Enable High Current Power Good Low Threshold Power Good High Threshold Power Good Output Low Voltage Power Good Leakage Current Thermal Shutdown Thermal Shutdown Hysteresis Notes: 1. 2. 3. en Conditions (Adjustable) (Fixed Output) 1mA≤IO≤500mA (Adjustable) (Fixed Output) 1mA≤IO≤500mA Adjustable VOUT only AMS3106A-X Adjustable VOUT only AMS3106-X Adjustable VOUT only Min. -1 -2 -2 -3.5 Typ. Max. 1 2 2 3.5 Units % % % % 0.594 0.600 0.606 V 0.588 0.600 0.612 10 100 nA mA % 150 µA µA mA 500 IOUT= 0 – 500mA 0.5 VIN=3.0 – 12V; IOUT=100mA 0.15 VIN=3.3V, Io=0A VIN=3.3V, VEN=0V 120 <1 650 220 300 425 33 IOUT=100mA; VOUT=95% of VOUT(NOM) IOUT=250mA; VOUT=95% of VOUT(NOM) IOUT=500mA; VOUT=95% of VOUT(NOM) F=10KHz Io=20mA Opt. CBYP Pin Only BW: 100Hz–100 KHz COUT = 22µF ILOAD = 150mA % mV dB 118 No CBYP µV(rms) CBYP = 10nF 33 VEN(L) VEN(H) IEN(L) IEN(H) VPG VPG VEN = 0V VEN = 1.5V % of VOUT PG ON / Opt. PG Pin only % of VOUT PG OFF / Opt. PG Pin only VPGL IPG_SINK = 500μA,Fault Condition 200 IPG TSD PG off, VPG = 12V 0.01 145 15 TSD_HYS 1 1.1 0 150 97 V V nA nA % % 300 mV 10 300 89 μA °C °C Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Measured on approximately 1” square of 1 oz. copper. The total power dissipation for SO-8 EDP package is recommended to 2.5W rated at 25⁰C ambient temperature. The thermal resistance Junction to Case is 45⁰C/W. Total power dissipation for the switching regulator and the LDO should be taken in consideration when calculating the output current capability of each regulator. 02/11/2010 www.advanced-monolithic.com 4 Phone (925) 443-0722 Fax (925) 443-0723 A AMS3 3106 Micrropower 50 00mA Low w Noise Fas st Transien nt Respons se LDO Ty ypical Perfo ormance Characteris C stics (TA = 25°C 2 unless otherwise o sp pecified) utput Voltage e Temperaturre Variation Ou (Fixed Voltag ge Option) VO = 1.8V 1.825 Output Voltage (V) Adjust j Voltage g (V) ( ) 0.606 A Adjust (ADJ) Voltage V Tem mperature Varriation (Adjus stable Voltag ge Option) 0.604 0.602 0.600 1.815 1.805 1.795 -50 -25 0 25 50 7 75 100 12 25 -50 Ambient Temperature e (ºC) IGND vs. Output Current C VO=1.8V, VIN=2.5V V ‐50°C 10 25°C 5 100°C 0 0 Shutdown Currrent vs. Input Voltage 100 20 00 300 400 125°C 40 30 20 25°°C 10 0 50 00 0 Outpu ut Current (A A) Lin ne Regulation VO = 1.8V,, IO = 100mA 0.2 0.1 0.0 -0.1 -0.2 3 02/11/2010 0 6 9 Inputt Voltage (V) 1 2 3 4 5 6 7 8 9 10 11 12 1 Input Voltage (V)) 12 Output Voltage Change (%) Output p Voltage g Error (%) ( ) 12 25 50 Shutdown Current (µA) Ground Current ((mA)) 15 -25 0 25 50 75 7 100 Ambient Temperature e (ºC) Load d Regulation 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 0.0 www.ad dvanced-mono olithic.com 5 0.1 Output Current C (A) Phone (925)) 443-0722 Fax (925)) 443-0723 1.0 A AMS3 3106 Micrropower 50 00mA Low w Noise Fas st Transien nt Respons se LDO VDO vs. Output O Curre ent 600 500 100°C 400 25°C 300 ‐50°C 200 100 VOUT = 1.8V 0 Dropout Voltage (mV) Dropout p Voltage g (mV) ( ) Ty ypical Perfo ormance Characteris C stics (TA = 25°C 2 unless otherwise o sp pecified) VDO vs. Tempe erature (IO = 500mA) D 600 500 400 300 200 0 100 20 00 300 400 Output Current (mA A) -50 -25 0 25 50 75 Ambient Temperature T e (°C) Enable Starrt-Up Load Transient 50mA to 550mA A, VOUT=1.8V, VIN=3.3V CIN= COUT=4.7µF 02/11/2010 0 50 00 IOUT = 0 to 350mA, VOUT = 1.8V, VIN = 3.0V, CIN=C = OUT=10µF www.ad dvanced-mono olithic.com 6 Phone (925)) 443-0722 Fax (925)) 443-0723 10 00 AMS3106 Micropower 500mA Low Noise Fast Transient Response LDO Functional Block Diagram Figure 1: Block Diagram of AMS 3106 with ByPass Pin Option Figure 2: Block Diagram of AMS 3106 with Power Good Pin Option 02/11/2010 www.advanced-monolithic.com 7 Phone (925) 443-0722 Fax (925) 443-0723 AMS3106 Micropower 500mA Low Noise Fast Transient Response LDO Functional Block Diagram VIN VOUT Current Limit ADJ - Error Amp EN + Over Temperature Protection AMS3106AM1 AMS3106M1 AMS3106AS AMS3106S VREF= 0.6V GND Figure 3: Block Diagram of AMS 3106 with Adjustable Pin Option 02/11/2010 www.advanced-monolithic.com 8 Phone (925) 443-0722 Fax (925) 443-0723 AMS3106 Micropower 500mA Low Noise Fast Transient Response LDO Device Summary The AMS3106 is a high voltage low drop out linear regulator with a current capability of up to 500mA. The LDO has an input voltage range of 1.5V to 12V with an output voltage as low as 0.6V and is stable with a wide range of ceramic, tantalum, and electrolytic output capacitors. Shutdown/Enable The Enable (on/off) input threshold voltage is 1.1V. When disabled the LDO quiescent current decreases to a typical value of <1µA. Fault Protection Short circuit and over-temperature shutdown disable the converter and LDO in the event of an overload condition. Over-temp shutdown disables the device when the junction temperature exceeds 145 ºC. The output current is internally limited to 650mA. Input Capacitor An input bypass capacitor ranging from 1µF to 10µF is required. The capacitor should be placed as close as possible to the device and not be placed more than 1 inch from the LDO. Output Capacitor The output capacitor requirements range from the minimum value required to guarantee stability to a larger value required to meet the extreme transient response requirements. Values range from 10 to 22µF X5R ceramic capacitors. Due to the extreme voltage coefficient of X5R ceramic capacitors, the voltage rating should be at least double the maximum applied voltage. Bypass Capacitor If the ByPass (BYP) is available, connecting a capacitor between the BYP pin and ground can significantly reduce output noise. Values can range from 0pF to 10nF, depending on the sensitivity to output noise in the application. The start-up speed of the AMS3106 is inversely proportional to the size of the bypass capacitor. Applications requiring a slow ramp-up of output voltage should consider larger values of bypass capacitance. Likewise, if rapid turnon is necessary, consider omitting CBYP. 02/11/2010 Because the ByPass (BYP) pin is high-impedance, careful considering must be taken in the PCB layout to minimize noise pickup, and capacitors must be selected to minimize current leakage. Current leakage into the BYP pin will directly affect the regulator’s accuracy and should be kept low as possible. Using high quality ceramic and film type’s capacitors are recommended for their low leakage characteristics. Adjustable Version: Feedback Resistor Selection Choosing AMS 3106 with adjustable output voltage option allows the user to select an output voltage by using an external resistor divider. AMS 3106 uses a 0.6V reference voltage at the positive terminal of the error amplifier. To set the output voltage a programming resistor from the adjust pin (ADJ) to ground must be selected (See Pg.1). A 10kΩ resistor is a good selection for a programming resistor R2. A higher value may result in an excessively sensitive feedback node while a lower value will draw more current and degrade the light load efficiency. The equation for selecting the voltage specific resistor is: R1 = Vout Vref -1 ·R2 = 1.8V 0.6V -1 ·10kΩ = 20kΩ Table 1: Adjustable Feedback Resistor values R1 (kΩ) VOUT (V) (R2=10kΩ) 1.8 20.0 2.5 31.6 3.3 45.3 5.0 73.2 Power Good During operation, fault conditions can occur unexpectedly. Such conditions include input voltage dropout (low VIN), overheating, or overloading (excessive output current). If any of these conditions occurs, the PG pin will set an “error flag”. The PG pin, which is an open-collector output, will go LOW when VOUT is less than 95% or the specified output voltage. When the voltage at VOUT is greater than 95% of the specified output voltage, the PG pin is HIGH. A logic pull-up resistor of 10KΩ is recommended at this output. The pin can be left disconnected if unused. www.advanced-monolithic.com 9 Phone (925) 443-0722 Fax (925) 443-0723 AMS3106 Micropower 500mA Low Noise Fast Transient Response LDO PCB Layout The following guidelines should be followed to insure proper layout. 1. VIN Capacitor. A low ESR ceramic bypass capacitor must be placed as close to the IC as possible. 2. (ADJ) Feedback Resistors. The (ADJ) feedback resistors should be placed as close as possible the IC. Minimize the length of the trace from the feedback pin to the resistors. This is a high impedance node susceptible to interference from external RF noise sources. 3. Ground. 4. For good thermal performance vias are required to couple the exposed tab of the SO-8 package to the PCB ground plane. The via diameter should be 0.3mm to 0.33mm positioned on a 1.2mm grid. 02/11/2010 Output Power and Thermal Limits The AMS3106 junction temperature and current capability depends on the internal dissipation and the junction to case thermal resistance of the SO-8 exposed paddle package. Additionally, the paddle and PCB temperature will be elevated due to the total losses of the LDO and of other circuits mounted to the PCB. Tjmax = Pd·θjc + Tpcb + Tamb The internal losses contribute to the junction temperature rise above the paddle and PCB temperature. www.advanced-monolithic.com 10 Phone (925) 443-0722 Fax (925) 443-0723 AMS3106 Micropower 500mA Low Noise Fast Transient Response LDO Figure 4: AMS3106 SOIC-8 Evaluation Board Top Side Figure 5: AMS3106 SOIC-8 Evaluation Board Bottom Side Enable Vout 1 2 U1 1 2 Vin 3 R1 Table C1 10uF C2 22uF C3 n/a 4 AMS3106 EN GND VIN GND VOUT GND BYP/PG/ADJ GND 8 7 6 5 Byp/PG C4 10nF R2 10.0k gnd gnd Figure 6: AMS3106 SOIC-8 Evaluation Board Schematic Component C1 C2 C3 C4 1.2V 1.8V 2.5V 3.3V 5.0V R1 PG R2 U1 02/11/2010 Table 2: AMS3106 SOIC-8 Evaluation Board Bill of Materials Value Manufacturer Manufacturer Part Number 10µF, 50V, X5R, 1210, Ceramic 22µF, 10V, X5R, 0805, Ceramic Optional Feedforward 10nF, 50V,20%,X7R,0603 Bypass Version Only. 10.0kΩ, 0.1W, 0603 1% 20.0kΩ, 0.1W, 0603 1% 31.6kΩ, 0.1W, 0603 1% 45.3kΩ, 0.1W, 0603 1% 73.2kΩ, 0.1W, 0603 1% 100kΩ, 0.1W, 0603 1% Power Good version Only. 10.0kΩ, 0.1W, 0603 1% Linear Regulator Taiyo Yuden Taiyo Yuden UMK325BJ106KM-T LMK212BJ226MG-T Murata Various Various Various Various Various GRM188R71H103MA01 CRCW0603xxKxFKEA CRCW0603xxKxFKEA CRCW0603xxKxFKEA CRCW0603xxKxFKEA CRCW0603xxKxFKEA Various Various AMS CRCW0603100KFKEA CRCW060310K0FKEA AMS3106 SOIC-8 EDP www.advanced-monolithic.com 11 Phone (925) 443-0722 Fax (925) 443-0723 AMS3106 Micropower 500mA Low Noise Fast Transient Response LDO Figure 8: AMS3106 SOT23-5 Evaluation Board Bottom Side Figure 7: AMS3106 SOT23-5 Evaluation Board Top Side U1 Vin 1 C1 10uF 2 3 gnd VIN VOUT C3 n/a GND EN Vout 5 BYP/PG/ADJ R1 14.3k 4 C2 2.2uF AMS3106-5L SOT23 Enable C4 10nF 2 1 R2 10k gnd Byp/PG Figure 9: AMS3106 SOT23-5 Evaluation Board Schematic Component C1 C2 C3 C4 1.2V 1.8V 2.5V 3.3V 5.0V R1 PG R2 U1 02/11/2010 Table 3: AMS3106 SOT23-5 Evaluation Board Bill of Materials Value Manufacturer Manufacturer Part Number 10µF, 50V, X5R, 1210, Ceramic 2.2µF, 10V, X5R, 0805, Ceramic Optional Feedforward 10nF, 50V,20%,X7R,0603 Bypass Version Only. 10.0kΩ, 0.1W, 0603 1% 20.0kΩ, 0.1W, 0603 1% 31.6kΩ, 0.1W, 0603 1% 45.3kΩ, 0.1W, 0603 1% 73.2kΩ, 0.1W, 0603 1% 100kΩ, 0.1W, 0603 1% Power Good version Only. 10.0kΩ, 0.1W, 0603 1% Linear Regulator Taiyo Yuden Taiyo Yuden UMK325BJ106KM-T LMK212BJ225MG-T Murata GRM188R71H103MA01 Various Various Various Various Various Various CRCW0603xxKxFKEA CRCW0603xxKxFKEA CRCW0603xxKxFKEA CRCW0603xxKxFKEA CRCW0603xxKxFKEA CRCW0603100KFKEA Various AMS CRCW060310K0FKEA AMS3106-5L SOT23 www.advanced-monolithic.com 12 Phone (925) 443-0722 Fax (925) 443-0723 AMS3106 Micropower 500mA Low Noise Fast Transient Response LDO Ordering Information Device AMS3106AS-XXBP(1)(2)(3) (1)(2)(3) AMS3106S-XXBP AMS3106AS-XXPG (1)(2)(3) (1)(2)(3) AMS3106S-XXPG (1)(2) AMS3106AS (1)(2) AMS3106S Package SOIC-8 EDP SOIC-8 EDP SOIC-8 EDP SOIC-8 EDP SOIC-8 EDP SOIC-8 EDP Notes: 1. Available in tape and reel only. A reel contains 2,500 devices. 2. Available in lead-free package only. Device is fully WEEE and RoHS compliant 3. Need to specify output voltage option ( ) Outline Drawing and Landing Pattern Package dimensions are inches (millimeters) unless otherwise noted. 02/11/2010 www.advanced-monolithic.com 13 Phone (925) 443-0722 Fax (925) 443-0723 AMS3106 Micropower 500mA Low Noise Fast Transient Response LDO Ordering Information Device AMS3106AM1-XXBP(1)(2)(3) Package 5L SOT-23 (1)(2)(3) AMS3106M1-XXBP AMS3106AM1-XXPG AMS3106M1-XXPG AMS3106AM1 AMS3106M1 5L SOT-23 (1)(2)(3) 5L SOT-23 (1)(2)(3) 5L SOT-23 (1)(2) 5L SOT-23 (1)(2) 5L SOT-23 Notes: 1. Available in tape and reel only. A reel contains 2,500 devices. 2. Available in lead-free package only. Device is fully WEEE and RoHS compliant 3. Need to specify output voltage option ( ) Outline Drawing and Landing Pattern Package dimensions are inches (millimeters) unless otherwise noted. 0.110-0.120 (2.794-3.048) 0.102-0.118 (2.60-3.00) 0.059-0.070 (1.50-1.75) 0.014-0.020 (0.350-0.50) 0.037 (0.95) TYP 0.018-0.024 (0.457-0.610) 10° NOM 0.036-0.051 (0.090-1.30) 0.0035-0.0080 (0.090-0.20) 0.003 (0.150) MAX 02/11/2010 0.075 (1.90) TYP 10° NOM www.advanced-monolithic.com 14 0.018-0.024 (0.457-0.610) Phone (925) 443-0722 Fax (925) 443-0723