RT9164A 1A Fixed and Adjustable Low Dropout Positive Voltage Regulators General Description The RT9164A series of high performance positive voltage regulators is designed for applications requiring low dropout performance at fully rated current. Additionally, the RT9164A series provides excellent regulation over variations in line and load. Outstanding features include low dropout performance at rated current, fast transient response, internal current-limiting, and thermal-shutdown protection of the output device. The RT9164A series of three terminal regulators offers fixed and adjustable voltage options available in space-saving SOT-223, TO-252, and TO-263 packages. Features z z z z z z z Applications z Ordering Information z RT9164A- z Package Type G : SOT-223 L: TO-252 LR : TO-252 (R-Type) M : TO-263 Lead Plating System P : Pb Free G : Green (Halogen Free and Pb Free) Output Voltage Default : Adjustable 15 : 1.5V 18 : 1.8V 25 : 2.5V 28 : 2.85V 30 : 3.0V 33 : 3.3V 35 : 3.5V Low Dropout Performance, 1.4V Max Full Current Rating Over Line and Temperature Fast Transient Response ±2% Output Voltage Accuracy 1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V, and 3.5V Fixed Adjustable Output Voltage SOT-223, TO-252, and TO-263 Packages RoHS Compliant and 100% Lead (Pb)-Free Active SCSI Termination Low Voltage Microcontrollers Switching Power Supply Post-Regulator Pin ConFigurations (TOP VIEW) 3 VIN 2 VOUT (TAB) 1 ADJ/GND SOT-223 3 2 VIN VOUT (TAB) 1 ADJ/GND TO-252 Note : Richtek products are : ` RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. ` Suitable for use in SnPb or Pb-free soldering processes. 3 VOUT 2 ADJ/GND (TAB) 1 VIN TO-252 (R-Type) Marking Information For marking information, contact our sales representative directly or through a Richtek distributor located in your area. 3 VIN 2 VOUT (TAB) 1 ADJ/GND TO-263 DS9164A-15 April 2011 www.richtek.com 1 RT9164A Typical Application Circuit VIN VIN = 5V RT9164A VOUT ADJ 10uF + + VREF CIN VOUT = 3.45V R1 133 1% COUT 10uF IADJ R2 232 1% Tantalum VOUT = VREF(1+ R2 R1 )+IADJ R2 (1) CIN needed if device is far from filter capacitors. (2) COUT required for stability. Figure 1. Adjustable Voltage Regulator RT9164A-33 VIN VOUT VIN = 5V VOUT 3.3V GND + + CIN 10uF IQ COUT 10uF Tantalum (1) CIN needed if device is far from filter capacitors. (2) COUT required for stability. Figure 2. Fixed Voltage Regulator RT9164A-28 VIN VOUT VIN = 5V 18 - 27 Lines GND COUT + + CIN 10uF 22uF IQ Figure 3. Active SCSI Bus Terminator www.richtek.com 2 DS9164A-15 April 2011 RT9164A Function Block Diagram VIN S.O.A. Current Limiting Amplifier LIMIT VOUT SENSE Thermal Overload Voltage Regulation Amplifer VREF ADJ/GND Functional Pin Description Pin Name Pin Function ADJ/GND Adjust Output or Ground. VOUT Output Voltage. VIN Power Input. DS9164A-15 April 2011 www.richtek.com 3 RT9164A Absolute Maximum Ratings z z z z z z z (Note 1) Supply Input Voltage ------------------------------------------------------------------------------------------------------ 15V Power Dissipation, PD @ TA = 25°C SOT-223 --------------------------------------------------------------------------------------------------------------------- 0.740W TO-252 ----------------------------------------------------------------------------------------------------------------------- 1.471W TO-263 ----------------------------------------------------------------------------------------------------------------------- 2.222W°C Package Thermal Resistance (Note 2) SOT-223, θJA ---------------------------------------------------------------------------------------------------------------- 135°C/W SOT-223, θJC --------------------------------------------------------------------------------------------------------------- 19°C/W TO-252, θJA ------------------------------------------------------------------------------------------------------------------ 68°C/W TO-252, θJC ----------------------------------------------------------------------------------------------------------------- 7.5°C/W TO-263, θJA ------------------------------------------------------------------------------------------------------------------ 45°C/W TO-263, θJC ----------------------------------------------------------------------------------------------------------------- 7.8°C/W Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C Storage Temperature Range --------------------------------------------------------------------------------------------- −65°C to 150°C ESD Susceptibility (Note 3) HBM (Human Body Mode) ----------------------------------------------------------------------------------------------- 8 kV MM (Machine Mode) ------------------------------------------------------------------------------------------------------ 750V Recommended Operating Conditions z z (Note 4) Supply Input Voltage ------------------------------------------------------------------------------------------------------ 3V to 14V Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C Electrical Characteristics (TA = 25°C, unless otherwise specified) Parameter Reference Voltage (Note 5) RT9164A Symbol VREF RT9164A -15 RT9164A -18 Output Voltage (Note 5) RT9164A -25 VOUT RT9164A -28 RT9164A -30 Test Conditions Min Typ Max Unit IOUT = 10mA, (VIN − VOUT) = 2V, TA = 25°C 1.243 1.256 1.281 V 10mA < IOUT < 1.0A, 1.5V < VIN − VOUT < 10V 1.231 1.256 1.294 V IOUT = 10mA, VIN = 3.3V, TJ = 25°C 1.485 1.5 1.53 10mA < IOUT < 1.0A, 3.3V < VIN < 10V 1.470 1.5 1.55 IOUT = 10mA, VIN = 3.3V, TJ = 25°C 1.797 1.815 1.85 10mA < IOUT < 1.0A, 3.3V < VIN < 10V 1.779 1.815 1.87 IOUT = 10mA, VIN = 4.0V, TJ = 25°C 2.475 2.500 2.550 10mA < IOUT < 1.0A, 4.0V < VIN < 10V 2.450 2.500 2.575 IOUT= 10mA, VIN= 4.25V, TJ = 25°C V 2.822 2.850 2.910 10mA < IOUT < 1.0A, 4.25V < VIN < 10V 2.793 2.850 2.936 IOUT = 10mA, VIN= 4.5V, TJ = 25°C 2.970 3.000 3.060 10mA < IOUT < 1.0A, 4.5V < VIN < 10V 2.940 3.000 3.090 To be continued www.richtek.com 4 DS9164A-15 April 2011 RT9164A Parameter Symbol IOUT = 10mA, VIN = 4.75V, TJ = 25°C RT9164A -33 Output Voltage V OU T (Note 5) RT9164A -35 Line Regulation (Note 5) Dropout Voltage Min Typ Max 3.267 3.300 3.365 10mA < IOUT< 1.0A, 4.75V < V IN < 10V 3.234 3.300 3.400 IOUT = 10mA, VIN= 5V, TJ = 25°C Unit 3.465 3.500 3.570 V 10mA < IOUT < 1.0A, 5.0V < V IN < 10V 3.430 3.500 3.605 RT9164A IOUT = 10mA, 1.5V ≤ VIN − V OUT ≤ 10V -- 0.1 0.3 RT9164A -15 IOUT = 10mA, 3.3V ≤ VIN ≤ 15V -- 1 6 RT9164A -18 IOUT = 10mA, 3.3V ≤ VIN ≤ 15V -- 1 6 IOUT = 10mA, 4.0V ≤ VIN ≤ 15V -- 1 6 RT9164A -28 IOUT = 10mA, 4.25V ≤ VIN ≤ 15V -- 1 6 RT9164A -30 IOUT = 10mA, 4.5V ≤ VIN ≤ 15V -- 1 6 RT9164A -33 IOUT = 10mA, 4.75V ≤ VIN ≤ 15V -- 1 6 RT9164A -35 IOUT = 10mA, 5.0V ≤ VIN ≤ 15V -- 1 6 RT9164A (V IN − VOUT) = 3V, 10mA ≤ I OUT ≤ 1.0A -- 0.2 0.4 RT9164A -15 VIN = 3.3V, 10mA ≤ I OUT ≤ 1.0A -- 1 10 RT9164A -18 VIN = 3.3V, 10mA ≤ I OUT ≤ 1.0A -- 1 10 VIN = 4.0V, 10mA ≤ I OUT ≤ 1.0A -- 1 10 VIN = 4.25V, 10mA ≤ I OUT ≤ 1.0A -- 1 10 RT9164A -30 VIN = 4.5V, 10mA ≤ I OUT ≤ 1.0A -- 1 12 RT9164A -33 VIN = 4.75V, 10mA ≤ I OUT ≤ 1.0A -- 1 12 RT9164A -35 VIN = 5.0V, 10mA ≤ I OUT ≤ 1.0A -- 1 15 V DROP IOUT = 500mA IOUT = 1.0A --- 1.15 1.3 1.25 1.4 V ILIM VIN = 5V 1.0 1.8 -- A RT9164A -25 RT9164A -25 Load Regulation (Note 5) Test Conditions RT9164A -28 (Note 6) Current Limit ΔVLINE ΔVLOAD % mV % mV Minimum Load Current RT9164A (V IN − V OUT) = 2V -- 5 10 Quiescent Current VIN = 5V -- 5 10 fRIPPLE = 120Hz , (V IN − V OUT) = 2V, VRIPPLE = 1V P-P -- 72 -- dB -- 65 120 μA -- 0.2 5 μA RT9164A -XX IQ Ripple Rejection PSRR Adjust Pin Current IADJ Adjust Pin Current Change ΔIADJ DS9164A-15 April 2011 10mA ≤ IOUT ≤ 1.0A, V IN = 5V mA www.richtek.com 5 RT9164A Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. 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 remain possibility to affect device reliability. Note 2. θJA is measured in the natural convection at T A = 25°C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard. The case point of θJC is on the center of the exposed pad. The pad size is 6mm2 on SOT-223 packages, 100mm2 on TO-252 packages, 125mm2 on TO-263 packages. Note 3. Devices are ESD sensitive. Handling precaution recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Note 5. Low duty cycle pulse testing with Kelvin connections. Note 6. The dropout voltage is defined as VIN − VOUT, which is measured when VOUT is VOUT(NORMAL) − 100mV. www.richtek.com 6 DS9164A-15 April 2011 RT9164A Typical Operating Characteristics Output Voltage vs. Temperature Reference Voltage vs. Temperature 1.27 3.4 Reference Voltage (V) VOUT = 3.3V Output Voltage (V) 3 2.6 VOUT = 2.5V 2.2 VIN = 5V CIN = 10uF Electrolytic CO = 10uF Tantalum RL = ∞ 1.8 VOUT = 1.5V 1.4 1.26 1.25 VIN = 5V CIN = 10uF Electrolytic CO = 10uF Tantalum R1 = R2 = 100Ω RL = ∞ 1.24 1.23 -50 -25 0 25 50 75 100 125 -50 Temperature (° C) 0 50 75 100 125 Quiescent Current vs. Temperature ADJ Pin Current vs. Temperature 7 60 VIN = 5V CIN = 10uF Electrolytic CO = 10uF Tantalum R1 = R2 = 100Ω RL = ∞ 50 Quiescent Current (mA) 70 6 5 VOUT = 2.5V 4 3 2 VIN = 5V CIN = 10uF Electrolytic CO = 10uF Tantalum RL = ∞ 1 0 40 -50 -25 0 25 50 75 100 -50 125 -25 0 Temperature (° C) Current Limit vs. Input Voltage 25 50 75 Temperature(° C) 100 125 Current Limit vs. Temperature 2 3 2.5 1.9 VOUT = 2.5V, RL = 1Ω 2 1.5 1 Current Limit (A)1 Current Limit (A) 25 Temperature (° C) 80 ADJ Pin Current (uA) -25 1.8 VOUT = 2.5V, RL = 1Ω 1.7 VIN = 5V CIN = 10uF Electrolytic CO = 10uF Tantalum 1.6 0.5 CIN = 10uF Electrolytic CO = 10uF Tantalum 0 2 4 6 8 10 Input Voltage (V) DS9164A-15 April 2011 12 14 1.5 -50 -25 0 25 50 75 100 125 Temperature (° C) www.richtek.com 7 RT9164A Current Limit Dropout Voltage vs. Io 3.5 VOUT = 2.5V -40°C 3 1.2 25°C 1.1 1.0 125°C 0.9 Current Limit (A) Dropout Voltage (V)1 1.3 0 0.3 0.6 0.9 1.2 2 1.5 1 0 1.5 Time (2.5ms/Div) Load Current (A) 20 10 VOUT = 1.5V CO = 10uF Tantalum ILOAD = 100mA 0 Line Transient Response Output Voltage Deviation (mV) Output Voltage Deviation (mV) Line Transient Response 30 Input Voltage Deviation (V) 6 5 20 0 7 6 5 Line Transient Response Load Transient Response VOUT = 3.3V CO = 10uF Tantalum ILOAD = 100mA 0 300 200 VIN = 3.3V, VOUT = 1.5V CIN = CO = 10uF Tantalum Preload = 0.1A 100 0 -100 Load Current (A) -20 Input Voltage Deviation (V) 30 Time (10us/Div) 20 7 6 5 Time (10us/Div) www.richtek.com 8 VOUT = 2.5V CO = 10uF Tantalum ILOAD = 100mA Time (10us/Div) Output Voltage Deviation (mV) Input Voltage Deviation (V) Output Voltage Deviation (mV) 7 30 40 -20 -10 40 VIN = 5V, VOUT = 2.5V CIN = 10uF Electrolytic CO = 10uF Tantalum RL = 1Ω 0.5 CIN = 10uF Electrolytic CO = 10uF Tantalum 0.8 2.5 1 0.5 0 Time (10us/Div) DS9164A-15 April 2011 RT9164A 300 200 100 VIN = 3.3V, VOUT = 1.5V CIN = CO = 10uF Tantalum Preload = 0.1A 0 Load Transient Response 300 Output Voltage Deviation (mV) Output Voltage Deviation (mV) Load Transient Response Load Current (A) 2 1 0 300 200 100 0 1 0.5 0 Time (10us/Div) Time (10us/Div) Load Transient Response Load Transient Response VIN = 5V, VOUT = 2.5V CIN = CO = 10uF Tantalum Preload = 0.1A 0 300 Load Current (A) -100 Load Current (A) 100 VIN = 5V, VOUT = 2.5V CIN = CO = 10uF Tantalum Preload = 0.1A -100 Output Voltage Deviation (mV) Output Voltage Deviation (mV) Load Current (A) -100 200 2 1 0 Time (10us/Div) VVININ == 5V, 5V,VVOUT 3.3V OUT == 3.3V 200 CCININ==CCOO==10uF 10uFTantalum Tantalum Preload Preload==0.1A 0.1A 100 0 -100 1 0.5 0 Time (10us/Div) Output Voltage Deviation (mV) Load Transient Response 300 200 100 VIN = 5V, VOUT = 3.3V CIN = CO = 10uF Tantalum Preload = 0.1A 0 Load Current (A) -100 2 1 0 Time (10us/Div) DS9164A-15 April 2011 www.richtek.com 9 RT9164A Application Information Output voltage adjustment Output Capacitor Like most regulators, the RT9164A regulates the output by comparing the output voltage to an internally generated reference voltage. On the adjustable version as shown in Figure 4, the VREF is available externally as 1.25V between VOUT and ADJ. The voltage ratio formed by R1 and R2 should be set to conduct 10mA (minimum output load). The output voltage is given by the following equation : RT9164A requires a capacitor from VOUT to GND to provide compensation feedback to the internal gain stage. This is to ensure stability at the output terminal. Typically, 10μF tantalum or 50μF aluminum electrolytic with 30mΩ to 2Ω range capacitor is sufficient. VOUT = VREF (1 + R2 R1 ) + IADJ R2 On fixed versions of RT9164A, the voltage divider is provided internally. The output capacitor does not have a theoretical upper limit and increasing its value will increase stability. COUT = 100μF or more is typical for high current regulator design. Region of Stable COUT ESR vs. Load Current 10 COUT = 100uF RT9164A VIN VOUT VIN VOUT 10uF R1 10uF IADJ + 65uF COUT + + VREF CADJ R2 C OUT ESR (Ω) ADJ CIN COUT = 10uF 1 Stable 0.1 Figure 4. Basic Adjustable Regulator Input Bypass Capacitor Instable Instable 0.01 0 0.2 An input capacitor is recommended. A 10μF tantalum on the input is a suitable input bypassing for almost all applications. 0.4 0.6 0.8 1 Load Current (A) Figure 5 Adjust Terminal Bypass Capacitor Load Regulation The adjust terminal can be bypassed to ground with a bypass capacitor (CADJ) to improve ripple rejection. This bypass capacitor prevents ripple from being amplified as the output voltage is increased. At any ripple frequency, the impedance of the CADJ should be less than R1 to prevent the ripple from being amplified : When the adjustable regulator is used (Figure 6), the best load regulation is accomplished when the top of the resistor divider (R1) is connected directly to the output pin of the RT9164A. When so connected, RP is not multiplied by the divider ratio. For Fixed output version, the top of R1 is internally connected to the output and ground pins can be connected to low side of the load. (2π x fRIPPLE x CADJ) < R1 The R1 is the resistor between the output and the adjust pin. Its value is normally in the range of 100-200Ω. For example, with R1 = 124Ω and fRIPPLE = 120Hz, the CADJ should be > 11μF. www.richtek.com 10 DS9164A-15 April 2011 RT9164A VIN RT9164A VIN VOUT ADJ RP Parasitic Line Resistance R1 (Connect R1 to VOUT or case) RL R2 Connect R2 to load Figure 6. Best Load Regulation Using Adjustable Output Regulator Thermal Protection RT9164A has thermal protection which limits junction temperature to 150°C. However, device functionality is only guaranteed to a maximum junction temperature of 125°C. The power dissipation and junction temperature for RT9164A are given by PD = (VIN − VOUT) x IOUT TJUNCTION = TAMBIENT + (PD x θJA) Note: TJUNCTION must not exceed 125° C Current Limit Protection RT9164A is protected against overload conditions. Current protection is triggered at typically 1.8A. Thermal Consideration The RT9164A series contain thermal limiting circuitry designed to protect itself from over-temperature conditions. Even for normal load conditions, maximum junction temperature ratings must not be exceeded. As mention in thermal protection section, we need to consider all sources of thermal resistance between junction and ambient. It includes junction-to-case, case-to-heat-sink interface, and heat sink thermal resistance itself. Junction-to-case thermal resistance is specified from the IC junction to the bottom of the case directly below the die. Proper mounting is required to ensure the best possible thermal flow from this area of the package to the heat sink. The case of all devices in this series is electrically connected to the output. Therefore, if the case of the device must be electrically isolated, a thermally conductive spacer is recommended. DS9164A-15 April 2011 www.richtek.com 11 RT9164A Outline Dimension Dimensions In Millimeters Symbol Dimensions In Inches Min Max Min Max A 1.400 1.800 0.055 0.071 A1 0.020 0.100 0.001 0.004 b 0.600 0.840 0.024 0.033 B 3.300 3.700 0.130 0.146 C 6.700 7.300 0.264 0.287 D 6.300 6.700 0.248 0.264 b1 2.900 3.100 0.114 0.122 e 2.300 0.091 H 0.230 0.350 0.009 0.014 L 1.500 2.000 0.059 0.079 L1 0.800 1.100 0.031 0.043 3-Lead SOT-223 Surface Mount Package www.richtek.com 12 DS9164A-15 April 2011 RT9164A D U C D1 R B T V E S L1 L3 b1 b L2 e b2 A Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 2.184 2.388 0.086 0.094 B 0.889 2.032 0.035 0.080 b 0.508 0.889 0.020 0.035 b1 1.016 Ref. 0.040 Ref. b2 0.457 0.584 0.018 0.023 C 0.457 0.584 0.018 0.023 D 6.350 6.731 0.250 0.265 D1 5.207 5.461 0.205 0.215 E 5.334 6.223 0.210 0.245 e 2.108 2.438 0.083 0.096 L1 9.398 10.414 0.370 0.410 L2 L3 0.508 Ref. 0.635 1.016 0.020 Ref. 0.025 0.040 U 3.810 Ref. 0.150 Ref. V 3.048 Ref. 0.120 Ref. R 0.200 0.850 0.008 0.033 S 2.500 3.400 0.098 0.134 T 0.500 0.850 0.020 0.033 3-Lead TO-252 Surface Mount Package DS9164A-15 April 2011 www.richtek.com 13 RT9164A C D U B V E L1 b1 L2 e b2 b A Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 4.064 4.826 0.160 0.190 B 1.143 1.676 0.045 0.066 b 0.660 0.914 0.026 0.036 b1 1.143 1.397 0.045 0.055 b2 0.305 0.584 0.012 0.023 C 1.143 1.397 0.045 0.055 D 9.652 10.668 0.380 0.420 E 8.128 9.652 0.320 0.380 e 2.286 2.794 0.090 0.110 L1 14.605 15.875 0.575 0.625 L2 2.286 2.794 0.090 0.110 U 6.223 Ref. 0.245 Ref. V 7.620 Ref. 0.300 Ref. 3-Lead TO- 263 Surface Mount Package Richtek Technology Corporation Richtek Technology Corporation Headquarter Taipei Office (Marketing) 5F, No. 20, Taiyuen Street, Chupei City 5F, No. 95, Minchiuan Road, Hsintien City Hsinchu, Taiwan, R.O.C. Taipei County, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Tel: (8862)86672399 Fax: (8862)86672377 Email: [email protected] Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek. www.richtek.com 14 DS9164A-15 April 2011