RT9164B 1A Fixed Low Dropout Positive Voltage Regulators General Description Features The RT9164B is designed for applications requiring low dropout performance at fully rated current. Additionally, the RT9164B 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 RT9164B available in space-saving TO-252 package. z z z z z Low Dropout Performance, 1.4V Max. Full Current Rating Over Line and Temperature Fast Transient Response ± 0.5% Output Voltage Accuracy RoHS Compliant and 100% Lead (Pb)-Free Applications z z Ordering Information z Active SCSI Termination Low Voltage Microcontrollers Switching Power Supply Post-Regulator RT9164B- Pin ConFigurations Package Type LR : TO-252 (R-Type) Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) (TOP VIEW) Output Voltage 33 : 3.3V 3 VOUT 2 GND (TAB) 1 VIN Note : RichTek Pb-free and Green products are : TO-252 (R-Type) `RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. `Suitable for use in SnPb or Pb-free soldering processes. `100%matte tin (Sn) plating. Typical Application Circuit RT9164B-33 VIN VOUT VIN = 5V VOUT 3.3V GND 10uF + + CIN IQ COUT 10uF Tantalum (1) CIN needed if device is far from filter capacitors. (2) COUT required for stability. DS9164B-02 March 2007 www.richtek.com 1 RT9164B Function Block Diagram VIN S.O.A. Current Limiting Amplifier LIMIT VOUT SENSE Thermal Overload Voltage Regulation Amplifer VREF GND Functional Pin Description Pin Name Pin Function GND Ground VOUT Output Voltage VIN Power Input www.richtek.com 2 DS9164B-02 March 2007 RT9164B Absolute Maximum Ratings z z z z z z z (Note 1) Supply Input Voltage -------------------------------------------------------------------------------------------------- 15V Power Dissipation, PD @ TA = 25°C TO-252 ------------------------------------------------------------------------------------------------------------------- 1.471W Package Thermal Resistance (Note 6) TO-252, θJA ------------------------------------------------------------------------------------------------------------- 68° C/W TO-252, θJC ------------------------------------------------------------------------------------------------------------- 7.5° C/W Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260° C Junction Temperature ------------------------------------------------------------------------------------------------- 150°C Storage Temperature Range ---------------------------------------------------------------------------------------- −65°C to 150°C ESD Susceptibility (Note 2) HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 8 kV MM (Machine Mode) -------------------------------------------------------------------------------------------------- 750V Recommended Operating Conditions z z (Note 3) Supply Input Voltage -------------------------------------------------------------------------------------------------- 3V to 12V Junction Temperature Range ---------------------------------------------------------------------------------------- −40°C to 125°C Electrical Characteristics (TA = 25°C, unless otherwise specified) Parameter Output Voltage (Note 4) Symbol VOUT Line Regulation (Note 4) ΔVLINE Test Conditions Min Typ Max Units 3.2835 3.3 3.3165 V -- 1 6 mV -- 1 12 mV I OUT = 500mA -- 1.15 1.25 V I OUT = 1.0A -- 1.3 1.4 V IOUT = 10mA, VIN = 4.75V, TJ = 25°C I OUT = 0mA, 4.75V ≤ VIN ≤ 15V Load Regulation (Note 4) ΔVLOAD VIN = 4.75V, 0 ≤ I OUT ≤ 1.0A Dropout Voltage (Note 5) VDROP Current Limit ILIM VIN = 5V 1.0 1.8 -- A Quiescent Current IQ VIN = 5V -- 5 10 mA Ripple Rejection PSRR fRIPPLE = 120Hz , (VIN − VOUT) = 2V, VRIPPLE = 1VP-P -- 72 -- dB 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. Devices are ESD sensitive. Handling precaution recommended. Note 3. The device is not guaranteed to function outside its operating conditions. Note 4. Low duty cycle pulse testing with Kelvin connections. Note 5. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) − 100mV. Note 6. 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 100mm2 on TO-252 package. DS9164B-02 March 2007 www.richtek.com 3 RT9164B Typical Operating Characteristics Line Transient Response Output Voltage vs. Temperature Output Voltage Deviation (mV) 3.4 3.32 VOUT = 3.3V CO = 10uF Tantalum ILOAD = 100mA 30 20 0 -20 3.28 VIN = 5V, VOUT = 3.3V CIN = 10uF Electrolytic CO = 10uF Tantalum RL = ∞ 3.24 Input Voltage Deviation (V) Output Voltage (V) 3.36 40 7 6 5 3.2 -50 -25 0 25 50 75 100 125 Time (10us/Div) Temperature (° C) 0 1 0.5 0 Time (10us/Div) www.richtek.com 4 300 200 100 VIN = 5V, VOUT = 3.3V CIN = CO = 10uF Tantalum Preload = 0.1A 0 -100 -100 Load Current (A) Output Voltage Deviation (mV) Load Current (A) VVININ == 5V, 5V, VVOUT 3.3V OUT == 3.3V C = C = 10uF IN O 200 CIN = CO = 10uFTantalum Tantalum Preload Preload==0.1A 0.1A 100 Load Transient Response Output Voltage Deviation (mV) Load Transient Response 300 2 1 0 Time (10us/Div) DS9164B-02 March 2007 RT9164B Application Information Input Bypass Capacitor Current Limit Protection An input capacitor is recommended. A 10μF tantalum on the input is a suitable input bypassing for almost all applications. RT9164B is protected against overload conditions. Current protection is triggered at typically 1.8A. Thermal Consideration Output Capacitor RT9164B 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. 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 C OUT ESR (Ω) COUT = 100uF Instable COUT = 10uF 1 Stable The RT9164B contains 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. 0.1 Instable 0.01 0 0.2 0.4 0.6 0.8 1 Load Current (A) Thermal Protection RT9164B 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 RT9164B are given by PD = (VIN - VOUT) x IOUT TJUNCTION = TAMBIENT + (PD x θJA) Note: TJUNCTION must not exceed 125° C DS9164B-02 March 2007 www.richtek.com 5 RT9164B Outline Dimension D U C D1 R B T V E S L1 L3 b1 b L2 e b2 A Symbol Dimensions In Millimeters Dimensions In Inches 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 www.richtek.com 6 DS9164B-02 March 2007 RT9164B Richtek Technology Corporation Richtek Technology Corporation Headquarter Taipei Office (Marketing) 5F, No. 20, Taiyuen Street, Chupei City 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Hsinchu, Taiwan, R.O.C. Taipei County, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Tel: (8862)89191466 Fax: (8862)89191465 Email: [email protected] DS9164B-02 March 2007 www.richtek.com 7