RT9166-1BPZ

RT9166/A 300/600mA, Ultra-Fast Transient Response LDO Regulator General Description The RT9166/A series are CMOS low dropout regulators optimized for ultra-fast transient response. The devices are capable of supplying 300mA or 600mA of output current with a dropout voltage of 230mV or 580mV respectively. The RT9166/A series are is optimized for CD/DVD-ROM, CD/RW or wireless communication supply applications. The RT9166/A regulators are stable with output capacitors as low as 1μF. The other features include ultra low dropout voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. The devices are available in fixed output voltages range of 1.2V to 4.5V with 0.1V per step. The RT9166/A regulators are available in 3-lead SOT-23, SOT-89, SOT-223, TO-92 and TO-252 packages. Features Low Quiescent Current (Typically 220μA) Guaranteed 300/600mA Output Current Low Dropout Voltage : 230/580mV at 300/600mA Wide Operating Voltage Ranges : 3V to 5.5V Ultra-Fast Transient Response Tight Load and Line Regulation Current Limiting Protection Thermal Shutdown Protection Only Low-ESR Ceramic Capacitor Required for Stability Custom Voltage Available RoHS Compliant and 100% Lead (Pb)-Free Applications CD/DVD-ROM, CD/RW Wireless LAN Card/Keyboard/Mouse Battery-Powered Equipment XDSL Router PCMCIA Card Ordering Information RT9166/APackage Type VL : SOT-23-3 (L-Type) X : SOT-89 XL : SOT-89 (L-Type) G : SOT-223 GL : SOT-223 (L-Type) Z : TO-92 L : TO-252 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Output Voltage 12 : 1.2V 13 : 1.3V : 45 : 4.5V 1B : 1.25V 600mA Output Current 300mA Output Current 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. DS9166/A-19 April 2008 Marking Information For marking information, contact our sales representative directly or through a Richtek distributor located in your area, otherwise visit our website for detail. Pin Configurations (TOP VIEW) VIN 3 1 GND 2 VOUT SOT-23-3 (L-Type) (RT9166) 3 2 1 VOUT GND VIN TO-92 (RT9166/A) www.richtek.com 1 RT9166/A 1 2 3 1 2 3 1 2 3 1 2 3 1 2 GND 3 VOUT GND (TAB) VIN GND VIN VOUT (TAB) SOT-89 SOT-89 (L-Type) VOUT GND (TAB) VIN GND VIN VOUT (TAB) SOT-223 SOT-223 (L-Type) VOUT VIN TO-252 Typical Application Circuit RT9166/A VIN CIN 1uF VIN VOUT GND COUT 1uF VOUT Note: To prevent oscillation, a 1μF minimum X7R or X5R dielectric is strongly recommended if ceramics are used as input/output capacitors. When using the Y5V dielectric, the minimum value of the input/output capacitance that can be used for stable over full operating temperature range is 3.3μF. (see Application Information Section for further details) Functional Pin Description Pin Name VIN VOUT GND Pin Function Supply Input Regulator Output Common Ground Function Block Diagram VIN Error Amplifier + VOUT Current Limiting Sensor Thermal Shutdown 1.2V Reference GND www.richtek.com 2 DS9166/A-19 April 2008 RT9166/A Absolute Maximum Ratings (Note 1) Supply Input Voltage -------------------------------------------------------------------------------------------------- 6.5V Power Dissipation, PD @ TA = 25°C SOT-23-3 ---------------------------------------------------------------------------------------------------------------- 0.4W SOT-89 ------------------------------------------------------------------------------------------------------------------- 0.571W SOT-223 ----------------------------------------------------------------------------------------------------------------- 0.740W TO-252 ------------------------------------------------------------------------------------------------------------------- 1.470W Package Thermal Resistance (Note 4) SOT-23-3, θJA ----------------------------------------------------------------------------------------------------------- 250°C/W SOT-89, θJA ------------------------------------------------------------------------------------------------------------- 175°C/W SOT-89, θJC ------------------------------------------------------------------------------------------------------------- 58°C/W SOT-223, θJA ------------------------------------------------------------------------------------------------------------ 135°C/W SOT-223, θJC ----------------------------------------------------------------------------------------------------------- 15°C/W TO-252, θJA ------------------------------------------------------------------------------------------------------------- 68°C/W TO-252, θJC ------------------------------------------------------------------------------------------------------------- 7°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) ------------------------------------------------------------------------------------------ 2kV MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V Recommended Operating Conditions (Note 3) Supply Input Voltage -------------------------------------------------------------------------------------------------- 2.8V to 5.5V Junction Temperature Range ---------------------------------------------------------------------------------------- – 40°C to 125°C Ambient Temperature Range ---------------------------------------------------------------------------------------- – 40°C to 85°C Electrical Characteristics (VIN = VOUT + 1V or VIN = 2.8V whichever is greater, CIN = 1μF, COUT = 1μF, TA = 25°C, unless otherwise specified) Parameter Output Voltage Accuracy Current Limit Quiescent Current Dropout Voltage (Note 7) Line Regulation Load Regulation (Note 5) RT9166 RT9166A RT9166 RT9166A (Note 6) RT9166 RT9166A Symbol ΔVOUT ILIM IQ VDROP Test Conditions IOUT = 1mA RLOAD = 1Ω IOUT = 0mA IOUT = 300mA IOUT = 600mA VIN = (VOUT + 0.3V) to 5.5V, IOUT = 1mA 1mA < IOUT < 300mA 1mA < IOUT < 600mA f = 1kHz, COUT = 1μF Min −1 300 600 ---------- Typ ---220 230 580 0.2 15 30 −55 170 40 Max +3 --300 ---35 55 ---- Units % mA μA mV ΔVLINE ΔVLOAD PSRR TSD ΔTSD %/V mV dB °C °C Power Supply Rejection Rate Thermal Shutdown Temperature Thermal Shutdown Hysteresis DS9166/A-19 April 2008 www.richtek.com 3 RT9166/A 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 is recommended. Note 3. The device is not guaranteed to function outside its operating conditions. Note 4. θJA is measured in the natural convection at TA = 25°C on a single layer low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Note 5. Regulation is measured at constant junction temperature by using a 20ms current pulse. Devices are tested for load regulation in the load range from 1mA to 300mA and 600mA respectively. Note 6. Quiescent, or ground current, is the difference between input and output currents. It is defined by IQ = IIN - IOUT under no load condition (IOUT = 0mA). The total current drawn from the supply is the sum of the load current plus the ground pin current. Note 7.The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) − 100mV. www.richtek.com 4 DS9166/A-19 April 2008 RT9166/A Typical Operating Characteristics Dropout Voltage vs. Load Current 700 600 Power Supply Rejection Ratio 0 CIN = 1uF COUT = 1uF TJ = 125°C -10 Dropout Voltage (mV) VIN = 5V CIN = 1uF COUT = 1uF 500 400 300 200 100 0 0 100 200 PSRR (dB) TJ = 25°C -20 -30 -40 -50 -60 TJ = −40°C 100mA 1mA 300 400 500 600 10 100 1k 10k 100k 1M Load Current (mA) Frequency (Hz) Region of Stable COUT ESR vs. Load Current 100.00 Output Noise VIN = 5V CIN = 1uF COUT = 1uF to 4.7uF 10.00 ILOAD = 100mA COUT = 1uF Output Noise Signal (μV) Instable 400 200 0 -200 -400 f = 10Hz to 100KHz COUT ESR (Ω) 1.00 Stable 0.10 0.01 Instable 0.00 0 100 200 300 400 500 600 Time (1ms/DIV) Load Current (mA) Current Limit vs. Input voltage 900 Current Limit vs. Input voltage 900 Current Limit (mA) 800 Current Limit (mA) 850 850 800 750 VIN = 5V CIN = 1uF COUT = 1uF RL = 0.5Ω 3 3.5 4 4.5 750 RT9166-33xX 700 5 5.5 700 VIN = 5V CIN = 1uF COUT = 1uF RL = 0.5Ω 3 3.5 4 4.5 RT9166-33xVL 5 5.5 Input voltage (V) Input voltage (V) DS9166/A-19 April 2008 www.richtek.com 5 RT9166/A Current Limit vs. Temperature 900 900 Current Limit vs. Temperature Current Limit (mA) 800 Current Limit (mA) 850 850 800 750 VIN = 5V CIN = 1uF COUT = 1uF RL = 0.5Ω -40 -50 -25 0 25 50 750 RT9166-33xX 700 VIN = 5V CIN = 1uF COUT = 1uF RL = 0.5Ω -50 -40 -25 0 25 50 700 75 100 125 RT9166-33xVL 75 100 125 Temperature (°C) Temperature (°C) Quiescent Current vs. Temperature 260 240 220 200 180 160 140 260 240 220 200 180 160 140 Quiescent Current vs. Temperature Quiescent Current (uA) 1 VIN = 5V CIN = 1uF COUT = 1uF -40 -50 -25 0 25 50 Quiescent Current (uA) 1 RT9166-33xX 75 100 125 VIN = 5V CIN = 1uF COUT = 1uF -50 -40 -25 0 25 50 RT9166-33xVL 75 100 125 Temperature (°C) Temperature (°C) Temperature Stability 3.4 Temperature Stability 3.4 Output Voltage (V) Output Voltage (V) 3.35 3.35 3.3 3.3 3.25 3.25 VIN = 5V CIN = 1uF COUT = 1uF 3.2 -40 -50 -25 0 25 50 RT9166-33xX 75 100 125 VIN = 5V CIN = 1uF COUT = 1uF 3.2 -50 -40 -25 0 25 50 RT9166-33xVL 75 100 125 Temperature (°C) Temperature (°C) www.richtek.com 6 DS9166/A-19 April 2008 RT9166/A Load Transient Response Load Current (mA) Load Transient Response Load Current (mA) 200 100 0 VIN = 5V, ILOAD = 1 to 150mA CIN = COUT = 1uF (Ceramic, X7R) 200 100 0 VIN = 5V, ILOAD = 1 to 150mA CIN = COUT = 1uF (Ceramic, X7R) Output Voltage Deviation (mV) 20 0 -20 RT9166-33xX Output Voltage Deviation (mV) 20 0 -20 RT9166-33xVL Time (100us/Div) Time (100us/Div) Line Transient Response Input Voltage Deviation (V) VIN = 4 to 5V CIN = 1uF COUT = 1uF 5 4 Output Voltage Deviation (mV) 20 0 -20 Time (100us/Div) DS9166/A-19 April 2008 www.richtek.com 7 RT9166/A Application Information Like any low-dropout regulator, the RT9166/A series requires input and output decoupling capacitors. These capacitors must be correctly selected for good performance (see Capacitor Characteristics Section). Please note that linear regulators with a low dropout voltage have high internal loop gains which require care in guarding against oscillation caused by insufficient decoupling capacitance. Input Capacitor An input capacitance of ≅ 1μF is required between the device input pin and ground directly (the amount of the capacitance may be increased without limit). The input capacitor MUST be located less than 1 cm from the device to assure input stability (see PCB Layout Section). A lower ESR capacitor allows the use of less capacitance, while higher ESR type (like aluminum electrolytic) require more capacitance. Capacitor types (aluminum, ceramic and tantalum) can be mixed in parallel, but the total equivalent input capacitance/ ESR must be defined as above to stable operation. There are no requirements for the ESR on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitance will be ≅ 1 μF over the entire operating temperature range. Output Capacitor The RT9166/A is designed specifically to work with very small ceramic output capacitors. The recommended minimum capacitance (temperature characteristics X7R or X5R) is 1μF to 4.7μF range with 10mΩ to 50mΩ range ceramic capacitor between LDO output and GND for transient stability, but it may be increased without limit. Higher capacitance values help to improve transient. The output capacitor's ESR is critical because it forms a zero to provide phase lead which is required for loop stability. (When using the Y5V dielectric, the minimum value of the input/output capacitance that can be used for stable over full operating temperature range is 3.3μF.) No Load Stability The device will remain stable and in regulation with no external load. This is specially important in CMOS RAM keep-alive applications. www.richtek.com 8 Input-Output (Dropout) Voltage A regulator's minimum input-to-output voltage differential (dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Because the device uses a PMOS, its dropout voltage is a function of drain-to-source on-resistance, RDS(ON), multiplied by the load current : VDROPOUT = VIN - VOUT = RDS(ON) x IOUT Current Limit The RT9166/A monitors and controls the PMOS' gate voltage, minimum limiting the output current to 300mA for RT9166 and 600mA for RT9166A. The output can be shorted to ground for an indefinite period of time without damaging the part. Short-Circuit Protection The device is short circuit protected and in the event of a peak over-current condition, the short-circuit control loop will rapidly drive the output PMOS pass element off. Once the power pass element shuts down, the control loop will rapidly cycle the output on and off until the average power dissipation causes the thermal shutdown circuit to respond to servo the on/off cycling to a lower frequency. Please refer to the section on thermal information for power dissipation calculations. Capacitor Characteristics It is important to note that capacitance tolerance and variation with temperature must be taken into consideration when selecting a capacitor so that the minimum required amount of capacitance is provided over the full operating temperature range. In general, a good tantalum capacitor will show very little capacitance variation with temperature, but a ceramic may not be as good (depending on dielectric type). Aluminum electrolytics also typically have large temperature variation of capacitance value. Equally important to consider is a capacitor's ESR change with temperature: this is not an issue with ceramics, as their ESR is extremely low. However, it is very important in Tantalum and aluminum electrolytic capacitors. Both show increasing ESR at colder temperatures, but the increase DS9166/A-19 April 2008 RT9166/A in aluminum electrolytic capacitors is so severe they may not be feasible for some applications. Ceramic : For values of capacitance in the 10μF to 100μF range, ceramics are usually larger and more costly than tantalums but give superior AC performance for by-passing high frequency noise because of very low ESR (typically less than 10mΩ). However, some dielectric types do not have good capacitance characteristics as a function of voltage and temperature. Z5U and Y5V dielectric ceramics have capacitance that drops severely with applied voltage. A typical Z5U or Y5V capacitor can lose 60% of its rated capacitance with half of the rated voltage applied to it. The Z5U and Y5V also exhibit a severe temperature effect, losing more than 50% of nominal capacitance at high and low limits of the temperature range. X7R and X5R dielectric ceramic capacitors are strongly recommended if ceramics are used, as they typically maintain a capacitance range within ±20% of nominal over full operating ratings of temperature and voltage. Of course, they are typically larger and more costly than Z5U/Y5U types for a given voltage and capacitance. Tantalum : Solid tantalum capacitors are recommended for use on the output because their typical ESR is very close to the ideal value required for loop compensation. They also work well as input capacitors if selected to meet the ESR requirements previously listed. Tantalums also have good temperature stability: a good quality tantalum will typically show a capacitance value that varies less than 10~15% across the full temperature range of 125°C to -40°C. ESR will vary only about 2X going from the high to low temperature limits. The increasing ESR at lower temperatures can cause oscillations when marginal quality capacitors are used (if the ESR of the capacitor is near the upper limit of the stability range at room temperature). Aluminum : This capacitor type offers the most capacitance for the money. The disadvantages are that they are larger in physical size, not widely available in surface mount, and have poor AC performance (especially at higher frequencies) due to higher ESR and ESL. Compared by size, the ESR of an aluminum electrolytic is higher than either Tantalum or ceramic, and it also varies greatly with temperature. A typical aluminum electrolytic can exhibit an ESR increase of as much as 50X when going from 25°C down to -40°C. It should also be noted that many aluminum electrolytics only specify impedance at a frequency of 120Hz, which indicates they have poor high frequency performance. Only aluminum electrolytics that have an impedance specified at a higher frequency (between 20kHz and 100kHz) should be used for the device. Derating must be applied to the manufacturer's ESR specification, since it is typically only valid at room temperature. Any applications using aluminum electrolytics should be thoroughly tested at the lowest ambient operating temperature where ESR is maximum. Thermal Considerations Thermal protection limits power dissipation in RT9166/A. When the operation junction temperature exceeds 170°C, the OTP circuit starts the thermal shutdown function and turns the pass element off. The pass element turn on again after the junction temperature cools by 40°C. For continuous operation, do not exceed absolute maximum operation junction temperature. The power dissipation definition in device is : PD = (VIN - VOUT) x IOUT + VIN x IQ The maximum power dissipation depends on the thermal resistance of IC package, PCB layout, the rate of surroundings airflow and temperature difference between junction to ambient. The maximum power dissipation can be calculated by following formula : PD (MAX) = ( TJ(MAX) - TA ) / θJA Where T J(MAX) i s the maximum operation junction temperature 125°C, TA is the ambient temperature and the θJA is the junction to ambient thermal resistance. DS9166/A-19 April 2008 www.richtek.com 9 RT9166/A For recommended operating conditions specification of RT9166/A, where T J(MAX) i s the maximum junction temperature of the die (125°C) and TA is the operated ambient temperature. The junction to ambient thermal resistance θ JA i s lay out dependent. For SOT-23-3 packages, the thermal resistance θJA is 250°C/W on the standard JEDEC 51-3 single-layer thermal test board. The maximum power dissipation at TA = 25°C can be calculated by following formula : PD (MAX) = ( 125°C − 25°C) / 250°C/W = 0.400W for SOT-23-3 packages PD (MAX) = ( 125°C − 25°C) / 175°C/W = 0.571W for SOT-89 packages PD (MAX) = ( 125°C − 25°C) / 135°C/W = 0.740W for SOT-223 packages PD (MAX) = ( 125°C − 25 °C) / 68 °C/W = 1.470W for TO-252 packages The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance θJA. For RT9166/A packages, Figure 1 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. 1500 1400 1300 1200 1100 1000 900 800 700 600 500 400 300 200 100 0 0 PCB Layout Good board layout practices must be used or instability can be induced because of ground loops and voltage drops. The input and output capacitors MUST b e directly connected to the input, output, and ground pins of the device using traces which have no other currents flowing through them. The best way to do this is to layout CIN and COUT near the device with short traces to the VIN, VOUT, and ground pins. The regulator ground pin should be connected to the external circuit ground so that the regulator and its capacitors have a “ single point ground” . It should be noted that stability problems have been seen in applications where “ vias” to an internal ground plane were used at the ground points of the device and the input and output capacitors. This was caused by varying ground potentials at these nodes resulting from current flowing through the ground plane. Using a single point ground technique for the regulator and it’ s capacitors fixed the problem. Since high current flows through the traces going into VIN and coming from VOUT, Kelvin connect the capacitor leads to these pins so there is no voltage drop in series with the input and output capacitors. Optimum performance can only be achieved when the device is mounted on a PC board according to the diagram below : Maximum Power Dissipation (mW) TO-252 Single Layer PCB SOT-223 SOT-89 SOT-23-3 VIN GND 25 50 75 100 125 Ambient Temperature (°C) Figure 1. Derating Curves for RT9166/A Packages VOUT Figure 2. SOT-23-3 Board Layout www.richtek.com 10 DS9166/A-19 April 2008 RT9166/A Outline Dimension D H L C B e A A1 b Symbol A A1 B b C D e H L Dimensions In Millimeters Min 0.889 0.000 1.397 0.356 2.591 2.692 1.803 0.080 0.300 Max 1.295 0.152 1.803 0.508 2.997 3.099 2.007 0.254 0.610 Dimensions In Inches Min 0.035 0.000 0.055 0.014 0.102 0.106 0.071 0.003 0.012 Max 0.051 0.006 0.071 0.020 0.118 0.122 0.079 0.010 0.024 SOT-23-3 Surface Mount Package DS9166/A-19 April 2008 www.richtek.com 11 RT9166/A D D1 A C B C1 e e H A b b b1 Symbol A b B b1 C C1 D D1 e H Dimensions In Millimeters Min 1.397 0.356 2.388 0.406 3.937 0.787 4.394 1.397 1.448 0.356 Max 1.600 0.483 2.591 0.533 4.242 1.194 4.597 1.753 1.549 0.432 Dimensions In Inches Min 0.055 0.014 0.094 0.016 0.155 0.031 0.173 0.055 0.057 0.014 Max 0.063 0.019 0.102 0.021 0.167 0.047 0.181 0.069 0.061 0.017 3-Lead SOT-89 Surface Mount Package www.richtek.com 12 DS9166/A-19 April 2008 RT9166/A D D1 H C B L e e L1 A b A1 Symbol A A1 b B C D D1 e H L L1 Dimensions In Millimeters Min 1.450 0.020 0.610 3.302 6.706 6.299 2.896 2.261 0.229 1.550 0.800 Max 1.803 0.100 0.787 3.708 7.290 6.706 3.150 2.362 0.330 1.950 1.100 Dimensions In Inches Min 0.057 0.0008 0.024 0.130 0.264 0.248 0.114 0.089 0.009 0.061 0.009 Max 0.071 0.0047 0.031 0.146 0.287 0.264 0.124 0.093 0.013 0.077 0.013 3-Lead SOT-223 Surface Mount Package DS9166/A-19 April 2008 www.richtek.com 13 RT9166/A 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 14 DS9166/A-19 April 2008 RT9166/A D A E L e D1 b C A1 Symbol A A1 b C D D1 E e L Dimensions In Millimeters Min 3.175 1.143 0.406 0.406 4.445 3.429 4.318 1.143 12.700 Max 4.191 1.372 0.533 0.533 5.207 5.029 5.334 1.397 Dimensions In Inches Min 0.125 0.045 0.016 0.016 0.175 0.135 0.170 0.045 0.500 Max 0.165 0.054 0.021 0.021 0.205 0.198 0.210 0.055 3-Lead TO-92 Plastic Package 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 DS9166/A-19 April 2008 www.richtek.com 15