RT9164C 1A Fixed and Adjustable Low Dropout Positive Voltage Regulators General Description Features The RT9164C series of high performance positive voltage regulators is designed for applications requiring low dropout performance at fully rated current. Additionally, the RT9164C 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 RT9164C series of three terminal regulators offers fixed and adjustable voltage options available in space-saving SOT-223, TO-252, and TO-263 packages. z z z z z z z Applications z z z Ordering Information RT9164CPackage 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 25 : 2.5V 33 : 3.3V Note : Low Dropout Performance, 1.4V Maximal Full Current Rating Over Line and Temperature Fast Transient Response ± 1% Output Voltage Accuracy 2.5V and 3.3V 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 Richtek products are : ` RoHS compliant and compatible with the current require- ` Suitable for use in SnPb or Pb-free soldering processes. TO-252 ments of IPC/JEDEC J-STD-020. Marking Information For marking information, contact our sales representative directly or through a Richtek distributor located in your area. 3 VOUT 2 ADJ/GND (TAB) 1 VIN TO-252 (R-Type) 3 VIN 2 VOUT (TAB) 1 ADJ/GND TO-263 DS9164C-03 April 2011 www.richtek.com 1 RT9164C Typical Application Circuit VIN VIN = 5V RT9164C VOUT ADJ COUT CIN 10uF 10uF R2 232 1% VOUT = 3.3V + 10uF + IADJ RT9164C-33 VIN VOUT VIN = 5V GND + + CIN VREF R1 133 1% VOUT = 3.45V IQ Tantalum VOUT = VREF(1+ COUT 10uF Tantalum R2 )+I R R1 ADJ 2 (1) CIN needed if device is far from filter capacitors. (2) COUT required for stability. (1) CIN needed if device is far from filter capacitors. (2) COUT required for stability. Figure 1. Adjustable Voltage Regulator Figure 2. Fixed Voltage Regulator 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. www.richtek.com 2 DS9164C-03 April 2011 RT9164C Absolute Maximum Ratings z z z z z z z (Note 1) Supply Input Voltage ---------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C SOT-223 ------------------------------------------------------------------------------------------------------------------TO-252 --------------------------------------------------------------------------------------------------------------------TO-263 --------------------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 2) SOT-223, θJA -------------------------------------------------------------------------------------------------------------SOT-223, θJC ------------------------------------------------------------------------------------------------------------TO-252, θJA ---------------------------------------------------------------------------------------------------------------TO-252, θJC --------------------------------------------------------------------------------------------------------------TO-263, θJA ---------------------------------------------------------------------------------------------------------------TO-263, θJC --------------------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------------Junction Temperature --------------------------------------------------------------------------------------------------Storage Temperature Range ------------------------------------------------------------------------------------------ESD Susceptibility (Note 3) HBM (Human Body Mode) --------------------------------------------------------------------------------------------MM (Machine Mode) ---------------------------------------------------------------------------------------------------- Recommended Operating Conditions z z z 15V 0.740W 1.471W 2.222W 135°C/W 19°C/W 68°C/W 7.5°C/W 45°C/W 7.8°C/W 260°C 150°C −65°C to 150°C 8kV 750V (Note 4) Supply Input Voltage ---------------------------------------------------------------------------------------------------- 3V to 12V Junction Temperature Range ------------------------------------------------------------------------------------------ −40°C to 125°C Ambient Temperature Range ------------------------------------------------------------------------------------------ −40°C to 85°C Electrical Characteristics (TA = 25°C, unless otherwise specified) Parameter Reference Voltage RT9164C (Note 5) Output Voltage (Note 5) RT9164C -25 RT9164C -33 Symbol VREF VOUT Load Regulation (Note 5) Min Typ Max IOUT = 10mA, (VIN − VOUT) = 2V, TA = 25°C 1.243 1.256 1.269 IOUT = 10mA, VIN = 4.0V, TJ = 25°C 2.475 2.500 2.525 IOUT = 10mA, V IN = 4.75V, TJ = 25°C 3.267 3.300 3.333 IOUT = 10mA, 1.5V ≤ V IN − VOUT ≤ 10V -- 0.1 0.3 IOUT = 10mA, 4.0V ≤ VIN ≤ 15V -- 1 6 RT9164C -33 IOUT = 10mA, 4.75V ≤ VIN ≤ 15V -- 1 6 RT9164C (VIN − VOUT) = 3V, 10mA ≤ I OUT ≤ 1.0A -- 0.2 0.4 -- 1 10 VIN = 4.75V, 10mA ≤ IOUT ≤ 1.0A -- 1 12 IOUT = 500mA -- 1.1 1.2 IOUT = 1.0A -- 1.3 1.4 1.0 1.8 -- RT9164C Line Regulation (Note 5) Test Conditions RT9164C -25 ΔV LINE RT9164C -25 ΔV LOAD VIN = 4.0V, 10mA ≤ IOUT ≤ 1.0A RT9164C -33 Dropout Voltage (Note 6) VDROP Current Limit ILIM VIN = 5V Unit V V % mV % mV V A To be continued DS9164C-03 April 2011 www.richtek.com 3 RT9164C Parameter Symbol Test Conditions Min Typ Max (VIN − V OUT) = 2V -- 5 10 Unit Minimum Load Current RT9164C RT9164C Quiescent Current -XX IQ VIN = 5V -- 5 10 Ripple Rejection PSRR fRIPPLE = 120Hz , (VIN − VOUT) = 2V, VRIPPLE = 1VP-P -- 72 -- dB Adjust Pin Current IADJ -- 65 120 uA Adjust Pin Current Change ΔIADJ -- 0.2 5 uA 10mA ≤ IOUT ≤ 1.0A, VIN = 5V mA 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 is 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 4 DS9164C-03 April 2011 RT9164C Typical Operating Characteristics Reference Voltage vs. Temperature Output Voltage vs. Temperature 1.27 3.4 Output Voltage (V) 3.0 2.6 VOUT = 2.5V 2.2 VIN = 5V CIN = 10uF Electrolytic CO = 10uF Tantalum RL = ∞ 1.8 Reference Voltage (V) VOUT = 3.3V 1.26 1.25 VIN = 5V CIN = 10uF Electrolytic CO = 10uF Tantalum R1 = R2 = 100Ω RL = ∞ 1.24 1.23 1.4 -50 -25 0 25 50 75 100 -50 125 -25 0 Temperature (° C) ADJ Pin Current vs. Temperature 75 100 125 Quiescent Current vs. Temperature 7 70 60 VIN = 5V CIN = 10uF Electrolytic CO = 10uF Tantalum R1 = R2 = 100Ω RL = ∞ 50 Quiescent Current (mA) ADJ Pin Current (uA) 50 Temperature (° C) 80 40 6 5 VOUT = 2.5V 4 3 2 VIN = 5V CIN = 10uF Electrolytic CO = 10uF Tantalum RL = ∞ 1 0 -50 -25 0 25 50 75 100 125 -50 -25 0 Temperature (° C) 25 50 75 100 125 Temperature (° C) Current Limit vs. Input Voltage Current Limit vs. Temperature 2.0 3.0 2.5 1.9 VOUT = 2.5V, RL = 1Ω 2.0 1.5 1.0 0.5 CIN = 10uF Electrolytic CO = 10uF Tantalum Current Limit (A) 1 Current Limit (A) 25 1.8 VOUT = 2.5V, RL = 1Ω 1.7 VIN = 5V CIN = 10uF Electrolytic CO = 10uF Tantalum 1.6 1.5 0.0 2 4 6 8 10 Input Voltage (V) DS9164C-03 April 2011 12 14 -50 -25 0 25 50 75 100 125 Temperature (° C) www.richtek.com 5 RT9164C Current Limit Dropout Voltage vs. Load Current 3.5 VOUT = 2.5V -40°C 3 1.2 25°C 1.1 1.0 Current Limit (A) Dropout Voltage (V) 1 1.3 CIN = 10uF Electrolytic CO = 10uF Tantalum 0.8 0 0.3 0.6 0.9 1.2 2 1.5 1 VIN = 5V, VOUT = 2.5V CIN = 10uF Electrolytic CO = 10uF Tantalum RL = 1Ω 0.5 125°C 0.9 2.5 0 Time (2.5ms/Div) 1.5 Load Current (A) VOUT = 2.5V CO = 10uF Tantalum ILOAD = 100mA 30 20 0 Line Transient Response 40 Output Voltage Deviation (mV) Output Voltage Deviation (mV) Line Transient Response 40 20 0 -20 Input Voltage Deviation (V) Input Voltage Deviation (V) -20 7 6 5 7 6 5 Time (10μs/Div) Time (10μs/Div) Output Voltage Deviation (mV) 200 100 VIN = 5V, VOUT = 2.5V CIN = CO = 10uF Tantalum Preload = 0.1A 0 Load Transient Response Output Voltage Deviation (mV) Load Transient Response 300 Load Current (A) 1 0.5 0 Time (10μs/Div) www.richtek.com 6 300 VIN = 5V, VOUT = 2.5V 200 CIN = CO = 10uF Tantalum Preload = 0.1A 100 0 -100 -100 Load Current (A) VOUT = 3.3V CO = 10uF Tantalum ILOAD = 100mA 30 2 1 0 Time (10μs/Div) DS9164C-03 April 2011 RT9164C Load Transient Response 0 1 0.5 0 Time (10μs/Div) DS9164C-03 April 2011 300 VIN = 5V, VOUT = 3.3V 200 CIN = CO = 10uF Tantalum Preload = 0.1A 100 0 -100 -100 Load Current (A) Output Voltage Deviation (mV) Load Current (A) VIN = 5V, VOUT = 3.3V 200 CIN = CO = 10uF Tantalum Preload = 0.1A 100 Output Voltage Deviation (mV) Load Transient Response 300 2 1 0 Time (10μs/Div) www.richtek.com 7 RT9164C Application Information Output voltage adjustment Output Capacitor Like most regulators, the RT9164C 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: RT9164C 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 RT9164C, 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 RT9164C VOUT VOUT ADJ R1 10uF IADJ + 65uA COUT + 10uF VREF + CIN CADJ R2 C OUT ESR (Ω) VIN VIN Instable COUT = 10uF 1 Stable 0.1 Instable Figure 4. Basic Adjustable Regulator 0.01 0 0.2 Input Bypass Capacitor An input capacitor is recommended. A 10μF tantalum on the input is a suitable input bypassing for almost all applications. Adjust Terminal Bypass Capacitor 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: 0.4 0.6 0.8 1 Load Current (A) Figure 5 Load Regulation 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 RT9164C. 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 8 DS9164C-03 April 2011 RT9164C VIN RT9164C 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 PD = (VIN − VOUT) x IOUT TJUNCTION = TAMBIENT + (PD x θJA) Note : TJUNCTION must not exceed 125°°C Current Limit Protection RT9164C is protected against overload conditions. Current protection is triggered at typically 1.8A. Thermal Consideration The RT9164C 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. DS9164C-03 April 2011 www.richtek.com 9 RT9164C 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 10 DS9164C-03 April 2011 RT9164C 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 DS9164C-03 April 2011 www.richtek.com 11 RT9164C C D U B V E L1 b1 L2 e b2 b A Symbol Dimensions In Millimeters Dimensions In Inches 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 12 DS9164C-03 April 2011