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| RT9164B 1A Fixed Low Dropout Positive Voltage Regulators General Description 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. Features 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 Active SCSI Termination Low Voltage Microcontrollers Switching Power Supply Post-Regulator Ordering Information RT9164BPackage Type LR : TO-252 (R-Type) Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Output Voltage 33 : 3.3V Pin ConFigurations (TOP VIEW) 3 2 1 VOUT GND (TAB) VIN Note : RichTek Pb-free and Green 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. 100%matte tin (Sn) plating. TO-252 (R-Type) Typical Application Circuit RT9164B-33 VIN VOUT GND CIN IQ + + VIN = 5V VOUT 3.3V COUT 10uF 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 GND VOUT VIN Pin Function Ground Output Voltage Power Input www.richtek.com 2 DS9164B-02 March 2007 RT9164B Absolute Maximum Ratings (Note 1) Supply Input Voltage -------------------------------------------------------------------------------------------------- 15V Power Dissipation, PD @ TA = 25C TO-252 ------------------------------------------------------------------------------------------------------------------- 1.471W Package Thermal Resistance (Note 6) TO-252, JA ------------------------------------------------------------------------------------------------------------- 68 C/W TO-252, JC ------------------------------------------------------------------------------------------------------------- 7.5 C/W Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260C Junction Temperature ------------------------------------------------------------------------------------------------- 150C Storage Temperature Range ---------------------------------------------------------------------------------------- -65C to 150C ESD Susceptibility (Note 2) HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 8 kV MM (Machine Mode) -------------------------------------------------------------------------------------------------- 750V Recommended Operating Conditions (Note 3) Supply Input Voltage -------------------------------------------------------------------------------------------------- 3V to 12V Junction Temperature Range ---------------------------------------------------------------------------------------- -40C to 125C Electrical Characteristics (TA = 25C, unless otherwise specified) Parameter Output Voltage (Note 4) Symbol VOUT Test Conditions IOUT = 10mA, VIN = 4.75V, TJ = 25C I OUT = 0mA, 4.75V VIN 15V Min 3.2835 ----1.0 --- Typ 3.3 1 1 1.15 1.3 1.8 5 72 Max 3.3165 6 12 1.25 1.4 -10 -- Units V mV mV V V A mA dB Line Regulation (Note 4) VLINE Load Regulation (Note 4) VLOAD VIN = 4.75V, 0 I OUT 1.0A Dropout Voltage (Note 5) VDROP Current Limit Quiescent Current Ripple Rejection ILIM IQ PSRR I OUT = 500mA I OUT = 1.0A VIN = 5V VIN = 5V fRIPPLE = 120Hz , (VIN - VOUT) = 2V, VRIPPLE = 1VP-P 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. JA is measured in the natural convection at T A = 25C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard. The case point of JC 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 Output Voltage vs. Temperature 3.4 Line Transient Response Output Voltage Deviation (mV) 40 30 20 0 -20 VOUT = 3.3V CO = 10uF Tantalum ILOAD = 100mA 3.36 Output Voltage (V) 3.32 Input Voltage Deviation (V) 3.28 7 6 5 3.24 VIN = 5V, VOUT = 3.3V CIN = 10uF Electrolytic CO = 10uF Tantalum RL = -50 -25 0 25 50 75 100 125 3.2 Temperature (C) Time (10us/Div) Load Transient Response Output Voltage Deviation (mV) VIN = 5V, VOUT = 3.3V VIN = 5V, VOUT = 3.3V 200 CIN = CO = 10uF Tantalum CIN = CO = 10uF Tantalum Preload = 0.1A Preload = 0.1A 100 0 -100 Load Transient Response Output Voltage Deviation (mV) 300 200 100 0 -100 VIN = 5V, VOUT = 3.3V CIN = CO = 10uF Tantalum Preload = 0.1A 300 Load Current (A) Load Current (A) 1 0.5 0 2 1 0 Time (10us/Div) Time (10us/Div) www.richtek.com 4 DS9164B-02 March 2007 RT9164B Application Information Input Bypass Capacitor An input capacitor is recommended. A 10F tantalum on the input is a suitable input bypassing for almost all applications. 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, 10F tantalum or 50F aluminum electrolytic with 30m to 2 range capacitor is sufficient. The output capacitor does not have a theoretical upper limit and increasing its value will increase stability. COUT = 100F or more is typical for high current regulator design. Current Limit Protection RT9164B is protected against overload conditions. Current protection is triggered at typically 1.8A. Thermal Consideration 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. Region of Stable COUT ESR vs. Load Current 10 COUT = 100uF COUT = 10uF Instable C OUT ESR () 1 Stable 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 150C. However, device functionality is only guaranteed to a maximum junction temperature of +125C. The power dissipation and junction temperature for RT9164B are given by PD = (VIN - VOUT) x IOUT TJUNCTION = TAMBIENT + (PD x JA) Note: TJUNCTION must not exceed 125C DS9164B-02 March 2007 www.richtek.com 5 RT9164B Outline Dimension D D1 B T V E L1 S C U R L3 b1 b e b2 L2 A Symbol A B b b1 b2 C D D1 E e L1 L2 L3 U V R S T Dimensions In Millimeters Min 2.184 0.889 0.508 0.457 0.457 6.350 5.207 5.334 2.108 9.398 0.635 Max 2.388 2.032 0.889 0.584 0.584 6.731 5.461 6.223 2.438 10.414 1.016 Dimensions In Inches Min 0.086 0.035 0.020 0.018 0.018 0.250 0.205 0.210 0.083 0.370 0.025 Max 0.094 0.080 0.035 0.023 0.023 0.265 0.215 0.245 0.096 0.410 0.040 1.016 Ref. 0.040 Ref. 0.508 Ref. 3.810 Ref. 3.048 Ref. 0.200 2.500 0.500 0.850 3.400 0.850 0.020 Ref. 0.150 Ref. 0.120 Ref. 0.008 0.098 0.020 0.033 0.134 0.033 3-Lead TO-252 Surface Mount Package www.richtek.com 6 DS9164B-02 March 2007 RT9164B Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Richtek Technology Corporation Taipei Office (Marketing) 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com DS9164B-02 March 2007 www.richtek.com 7 |
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