RP1202 300mA, Ultra-Low Noise, Ultra-Fast CMOS LDO Regulator General Description Features The RP1202 is designed for portable RF and wireless applications with demanding performance and space requirements. The RP1202 performance is optimized for battery-powered systems to deliver ultra low noise and low quiescent current. A noise bypass pin is available for further reduction of output noise. Regulator ground current increases only slightly in dropout, further prolonging the battery life. The RP1202 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. The RP1202 consumes less than 0.01μA in shutdown mode and has fast turn-on time less than 50μs. The other features include ultra low dropout voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. Available in the 5-lead of SC-70 and SOT23 packages. z Ordering Information RP1202- z z z z z z z z z z z z z Applications z z z Package Type U5: SC-70-5 B : SOT-23-5 Ultra-Low-Noise for RF Application Ultra-Fast Response in Line/Load Transient Quick Start-Up (Typically 50μ μs) < 0.01μ μA Standby Current When Shutdown Low Dropout : 220mV @ 300mA Wide Operating Voltage Ranges : 2.5V to 5.5V TTL-Logic-Controlled Shutdown Input Low Temperature Coefficient Current Limiting Protection Thermal Shutdown Protection Only 1μ μF Output Capacitor Required for Stability High Power Supply Rejection Ratio Custom Voltage Available RoHS Compliant and 100% Lead (Pb)-Free z z z CDMA/GSM Cellular Handsets Battery-Powered Equipment Laptop, Palmtops, Notebook Computers Hand-Held Instruments PCMCIA Cards Portable Information Appliances Operating Temperature Range P : Pb Free with Commercial Standard G: Green ( Halogen Free with Commer- Marking Information cial Standard For marking information, contact our sales representative Output Voltage 15 : 1.5V 16 : 1.6V : 34 : 3.4V 35 : 3.5V 1H : 1.85V 2H : 2.85V Note : z directly or through a RichPower distributor located in your area. Pin Configurations (TOP VIEW) VIN 1 GND 2 EN 3 5 VOUT 4 BP RichPower 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. SC-70-5/SOT-23-5 RP1202-03 February 2009 1 RP1202 Typical Application Circuit RP1202 CIN 1uF VIN VOUT + + VIN GND Chip Enable EN COUT 1uF VOUT BP CBP 22nF Functional Pin Description Pin Name Pin Function VIN Power Input Voltage GND Ground EN Chip Enable (Active High). Note that this pin is high impedance. There should be a pull low 100KΩ resistor connected to GND when the control signal is floating. BP Reference Noise Bypass VOUT Output Voltage Function Block Diagram EN Shutdown and Logic Control Quick Start BP VIN VREF + MOS Driver Error Amplifier VOUT Current-Limit and Thermal Protection GND 2 RP1202-03 February 2009 RP1202 Absolute Maximum Ratings z z z z z z z (Note 1) Supply Input Voltage ---------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C SC-70-5 -------------------------------------------------------------------------------------------------------------------SOT-23-5 ------------------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 4) SC-70-5, θJA --------------------------------------------------------------------------------------------------------------SOT-23-5, θJA ------------------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------------Storage Temperature Range ------------------------------------------------------------------------------------------Operation Temperature Range ---------------------------------------------------------------------------------------ESD Susceptibility (Note 2) HBM (Human Body Mode) -------------------------------------------------------------------------------------------MM (Machine Mode) ---------------------------------------------------------------------------------------------------- Recommended Operating Conditions z 6V 300mW 400mW 333°C/W 250°C/W 260°C −65°C to 150°C −40°C to 85°C 2kV 200V (Note 3) Supply Input Voltage ---------------------------------------------------------------------------------------------------- 2.5V to 5.5V Electrical Characteristics (VIN = VOUT + 1V, CIN = COUT = 1μF, CBP = 10nF, TA = 25° C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Units Output Voltage Accuracy ΔVOUT IOUT = 1mA −2 -- +2 % Current Limit ILIM RLOAD = 1Ω 360 400 -- mA Quiescent Current IQ VEN ≥ -- 90 130 μA 170 200 -- 220 300 -- -- 0.3 % Dropout Voltage (Note 5) VDROP 1.2V, IOUT = 0mA IOUT = 200mA IOUT = 300mA VIN = (VOUT + 0.3V) to 5.5V, mV Line Regulation ΔVLINE Load Regulation ΔVLOAD 1mA < IOUT < 300mA -- -- 0.6 % Standby Current ISTBY VEN = GND, Shutdown -- 0.01 1 μA EN Input Bias Current IIBSD VEN = GND or VIN -- 0 100 nA VIL VIN = 3V to 5.5V, Shutdown -- -- 0.4 1.2 -- -- -- 100 -- -- −70 -- -- −50 -- EN Threshold Logic-Low Voltage Logic-High Voltage VIH Output Noise Voltage eNO Power Supply f = 100Hz Rejection Rate f = 10kHz PSRR IOUT = 1mA VIN = 3V to 5.5V, Start-Up 10Hz to 100kHz, IOUT = 200mA COUT = 1μF COUT = 1μF, IOUT = 10mA V μVRMS dB Thermal Shutdown Temperature TSD -- 165 -- °C Thermal Shutdown Temperature Hysteresis ΔTSD -- 30 -- °C RP1202-03 February 2009 3 RP1202 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. θJA is measured in the natural convection at T A = 25°C on a low effective thermal conductivity test board (Single Layer, 1S) of JEDEC 51-3 thermal measurement standard. Note 5. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) − 100mV. 4 RP1202-03 February 2009 RP1202 Typical Operating Characteristics Output Voltage vs. Temperature 1.8 RP1202-15PB VIN = 3.3V CIN = COUT = 1uF X7R RP1202-15PB VIN = 3.3V CIN = COUT = 1uF X7R 90 Quiescent Current (uA) 1.7 Output Voltage (V) Quiescent Current vs. Temperature 95 1.6 1.5 1.4 1.3 85 80 75 70 65 1.2 60 -50 -25 0 25 50 75 100 125 -50 -25 0 Dropout Voltage vs. Temperature RP1202-33PB CIN = COUT = 1uF 100 125 VIN = 4V to 5V CIN = COUT = 1uF, X7R 0 200 PSRR (dB) Dropout Voltage (mV) 75 PSRR 20 250 150 -20 -40 100 ILoad = 100mA -60 50 -80 0 0 0.05 0.1 0.15 0.2 0.25 0.3 ILoad = 10mA 10 0.01 100 0.1 1K 1 10K 10 100K 100 Load Current (A) Frequency (kHz) (Hz) EN Pin Shoutdown Threshold vs. Temperature EN Pin Shutdown Response 1.5 RP1202-15PB VIN = 3.3V CIN = COUT = 1uF X7R EN Pin Voltage (V) 1.75 1.25 Output Voltage (V) EN Pin Shoutdown Threshold (V) 50 Temperature (°C) Temperature (°C) 300 25 1 0.75 10 VIN = 5V CIN = COUT = 1uF 1M 1000 RP1202-28PB No Load 5 0 2 1 0 0.5 -50 -25 0 25 50 75 100 125 Time (500μs/Div) Temperature (°C) RP1202-03 February 2009 5 RP1202 Load Transient Response RP1202-15PB ILoad = 1mA to 60mA 50 Output Voltage Deviation (mV) 0 20 0 -20 200 0 50 0 -50 Line Transient Response Line Transient Response VIN = 4V to 5V COUT = 1uF RP1202-25PB ILoad = 1mA 5 4 10 0 -10 6 VIN = 4V to 5V COUT = 1uF RP1202-25PB ILoad = 100mA 5 4 10 0 -10 Time (50μs/Div) Time (100μs/Div) Noise Noise RP1202-30PB ILoad = 50mA VIN = 4.5V CIN = COUT = 1uF, X7R 200 200 100 100 Noise (μV) Noise (μV) RP1202-15PB ILoad = 1mA to 250mA Time (500μs/Div) VIN = 4.5V CIN = COUT = 1uF, X7R 0 -100 -200 RP1202-15PB ILoad = 50mA 0 -100 -200 f = 10Hz to 100kHz Time (10ms/Div) 6 VIN = 5V, VOUT = 2.8V 400 CIN = COUT = 1uF Time (500μs/Div) Input Voltage Deviation (V) 6 Load Current (mA) VIN = 5V, VOUT = 2.8V 100 CIN = COUT = 1uF Output Voltage Deviation (mV) Output Voltage Deviation (mV) Input Voltage Deviation (V) Output Voltage Deviation (mV) Load Current (mA) Load Transient Response f = 10Hz to 100kHz Time (10ms/Div) RP1202-03 February 2009 RP1202 Output Voltage (V) EN Pin Voltage (V) Start Up 10 VIN = 5V CIN = COUT = 1uF RP1202-28PB No Load 5 0 2 1 0 Time (10μs/Div) RP1202-03 February 2009 7 RP1202 Applications Information Like any low-dropout regulator, the external capacitors used with the RP1202 must be carefully selected for regulator stability and performance. Using a capacitor whose value is > 1μF on the RP1202 input and the amount of capacitance can be increased without limit. The input capacitor must be located a distance of not more than 0.5 inch from the input pin of the IC and returned to a clean analog ground. Any good quality ceramic or tantalum can be used for this capacitor. The capacitor with larger value and lower ESR (equivalent series resistance) provides better PSRR and line-transient response. The output capacitor must meet both requirements for minimum amount of capacitance and ESR in all LDOs application. The RP1202 is designed specifically to work with low ESR ceramic output capacitor in space-saving and performance consideration. Using a ceramic capacitor whose value is at least 1μF with ESR is > 25mΩ on the RP1202 output ensures stability. The RP1202 still works well with output capacitor of other types due to the wide stable ESR range. Figure 1 shows the curves of allowable ESR range as a function of load current for various output capacitor values. Output capacitor of larger capacitance can reduce noise and improve load transient response, stability, and PSRR. The output capacitor should be located not more than 0.5 inch from the VOUT pin of the RP1202 and returned to a clean analog ground. Region of Stable COUT ESR vs. Load Current 100.00 100 Instable C OUT ESR (Ω) Stable 0.01 RP1202-15PB CIN = COUT = 1uF, X7R Instable 0.00 50 100 Enable Function The RP1202 features an LDO regulator enable/disable function. To assure the LDO regulator will switch on, the EN turn on control level must be greater than 1.2 volts. The LDO regulator will go into the shutdown mode when the voltage on the EN pin falls below 0.4 volts. For to protecting the system, the RP1202 have a quick-discharge function. If the enable function is not needed in a specific application, it may be tied to VIN to keep the LDO regulator in a continuously on state. Thermal Considerations Thermal protection limits power dissipation in RP1202. When the operation junction temperature exceeds 165°C, the OTP circuit starts the thermal shutdown function turn the pass element off. The pass element turn on again after the junction temperature cools by 30°C. For continue operation, do not exceed absolute maximum operation junction temperature 125°C. The power dissipation definition in device is: 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: 1 1.00 0 Connecting a 22nF between the BP pin and GND pin significantly reduces noise on the regulator output, it is critical that the capacitor connection between the BP pin and GND pin be direct and PCB traces should be as short as possible. There is a relationship between the bypass capacitor value and the LDO regulator turn on time. DC leakage on this pin can affect the LDO regulator output noise and voltage regulation performance. PD = (VIN−VOUT) x IOUT + VIN x IQ 10 10.00 0.10 Bypass Capacitor and Low Noise 150 200 Load Current (mA) 250 300 PD(MAX) = ( TJ(MAX) − TA ) /θJA Where T J(MAX) is the maximum operation junction temperature 125°C, TA is the ambient temperature and the θJA is the junction to ambient thermal resistance. Figure 1 8 RP1202-03 February 2009 RP1202 For recommended operating conditions specification of RP1202, where T J(MAX) is the maximum junction temperature of the die (125°C) and TA is the maximum ambient temperature. The junction to ambient thermal resistance (θJA is layout dependent) for SOT-23-5 package is 250°C/W on standard JEDEC 51-3 thermal test board. The maximum power dissipation at TA = 25°C can be calculated by following formula: PD(MAX) = (125°C−25°C) / 333 = 300mW (SC-70-5) PD(MAX) = (125°C−25°C) / 250 = 400mW (SOT-23-5) The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance θJA. RP1202-03 February 2009 9 RP1202 Outline Dimension H D L B C b A A1 e Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 0.800 1.100 0.031 0.044 A1 0.000 0.100 0.000 0.004 B 1.150 1.350 0.045 0.054 b 0.150 0.400 0.006 0.016 C 1.800 2.450 0.071 0.096 D 1.800 2.250 0.071 0.089 e 0.650 0.026 H 0.080 0.260 0.003 0.010 L 0.210 0.460 0.008 0.018 SC-70-5 Surface Mount Package 10 RP1202-03 February 2009 RP1202 H D L B C b A A1 e Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 0.889 1.295 0.035 0.051 A1 0.000 0.152 0.000 0.006 B 1.397 1.803 0.055 0.071 b 0.356 0.559 0.014 0.022 C 2.591 2.997 0.102 0.118 D 2.692 3.099 0.106 0.122 e 0.838 1.041 0.033 0.041 H 0.080 0.254 0.003 0.010 L 0.300 0.610 0.012 0.024 SOT-23-5 Surface Mount Package RICHPOWER MICROELECTRONICS CORP. Headquarter Room 2102, 1077 ZuChongZhi Road, Zhang Jiang Hi-TechPark, Pudong New Area, Shanghai, China Tel: (8621)50277077 Fax: (8621)50276966 Information that is provided by Richpower Technology Corporation is believed to be accurate and reliable. Richpower 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 Richpower products into any application. No legal responsibility for any said applications is assumed by Richpower. RP1202-03 February 2009 11