RT9016 Preliminary 500mA Peak, Thermal Folded Back CMOS LDO Regulator General Description Features The RT9016 is designed for portable RF and wireless applications with demanding performance and space requirements. The RT9016 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 RT9016 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless z Short Circuit Thermal Folded Back Protection z devices. The RT9016 consumes less than 0.01μA in shutdown mode and has fast turn-on time less than 50μs. RT9016 is short circuit thermal folded back protected. RT9016 lowers its OTP trip point from 165°C to 110°C when output short circuit occurs (VOUT < 0.4V) providing maximum safety to end users. The other features include ultra low dropout voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. Available in the SOT-23-5 and WDFN-6L 2x2 packages. z 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 : 380mV @ 500mA 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 z z z z z z z z z Applications z z z Ordering Information z RT9016- z Package Type B : SOT-23-5 QW : WDFN-6L 2x2 (W-Type) Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Output Voltage 15 : 1.5V 16 : 1.6V : 34 : 3.4V 35 : 3.5V 1H : 1.85V 2H : 2.85V 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. z CDMA/GSM Cellular Handsets Battery-Powered Equipment Laptop, Palmtops, Notebook Computers Hand-Held Instruments PCMCIA Cards Portable Information Appliances 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 1 GND 2 EN 3 5 VOUT EN GND VIN 4 SOT-23-5 1 6 2 5 3 7 4 BP NC VOUT BP WDFN-6L 2x2 `100% matte tin (Sn) plating. DS9016-03 August 2007 www.richtek.com 1 RT9016 Preliminary Typical Application Circuit RT9016 VIN CIN 1uF Chip Enable VIN VOUT GND COUT VOUT 1uF EN BP CBP 22nF Functional Pin Description Pin Name Pin Function VIN 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 www.richtek.com 2 DS9016-03 August 2007 RT9016 Preliminary Absolute Maximum Ratings z z z z z z z (Note 1) Supply Input Voltage -----------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C SOT-23-5 -------------------------------------------------------------------------------------------------------------------WDFN-6L 2x2 -------------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 4) SOT-23-5, θJA --------------------------------------------------------------------------------------------------------------WDFN-6L 2x2, θJA --------------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------Junction Temperature ---------------------------------------------------------------------------------------------------Storage Temperature Range -------------------------------------------------------------------------------------------ESD Susceptibility (Note 2) HBM (Human Body Mode) ---------------------------------------------------------------------------------------------MM (Machine Mode) ------------------------------------------------------------------------------------------------------ Recommended Operating Conditions z z z 6V 400mW 606mW 250°C/W 165°C/W 260°C 150°C −65°C to 150°C 2kV 200V (Note 3) Supply Input Voltage ------------------------------------------------------------------------------------------------------ 2.5V to 5.5V Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C Electrical Characteristics (VIN = VOUT + 1V, CIN = COUT = 1μF, CBP = 22nF, 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 530 -- -- mA Quiescent Current IQ VEN ≥ -- 90 130 μA IOUT = 300mA, VOUT > 2.8V -- 220 -- IOUT = 500mA, VOUT > 2.8V -- 380 -- -- -- 0.3 % Dropout Voltage (Note 5) VDROP 1.2V, IOUT = 0mA VIN = (VOUT + 0.3V) to 5.5V, mV Line Regulation ΔVLINE Load Regulation ΔVLOAD 1mA < IOUT < 500mA -- -- 0.6 % Standby Current ISTBY VEN = GND, Shutdown -- 0.01 1 μA EN Input Bias Current IIBSD VEN = GND or VIN -- 0 100 nA Logic-Low Voltage VIL VIN = 3V to 5.5V, Shutdown -- -- 0.4 Logic-High Voltage VIH VIN = 3V to 5.5V, Start-Up 1.2 -- -- -- 100 -- -- −70 -- -- −50 -- EN Threshold Output Noise Voltage Power Supply f = 100Hz Rejection Rate f = 10kHz eNO PSRR IOUT = 1mA 10Hz to 100kHz, IOUT = 200mA COUT = 1μF COUT = 1μF, IOUT = 10mA V μVRMS dB To be continued DS9016-03 August 2007 www.richtek.com 3 RT9016 Parameter Thermal Shutdown Temperature Thermal Shutdown Temperature Hysteresis Preliminary Symbol Test Conditions Min Typ Max Units TSD -- 165 -- °C ΔTSD -- 30 -- °C -- 110 -- °C Thermal Folded Back 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. θ JA 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. www.richtek.com 4 DS9016-03 August 2007 RT9016 Preliminary Typical Operating Characteristics Output Voltage vs. Temperature 1.8 RT9016-15PB VIN = 3.3V CIN = COUT = 1uF X7R RT9016-15PB 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. Load Current TJ = 25°C 300 200 100 -40 -80 0 ILOAD = 100mA 300 400 500 ILOAD = 10mA 10 0.01 100 0.1 1K 1 10K 10 100K 100 Load Current (mA) Frequency (kHz) (Hz) EN Pin Shoutdown Threshold vs. Temperature EN Pin Shutdown Response 1.5 RT9016-15PB VIN = 3.3V CIN = COUT = 1uF X7R EN Pin Voltage (V) 1.75 1.25 Output Voltage (V) EN Pin Shoutdown Threshold (V) -20 -60 200 125 VIN = 4V to 5V CIN = COUT = 1uF, X7R TJ = -40°C 100 100 0 TJ = 125°C PSRR (dB) Dropout Voltage (mV) 500 0 75 PSRR 20 RT9016-33PB CIN = COUT = 1uF 400 50 Temperature (°C) Temperature (°C) 600 25 1 0.75 10 VIN = 5V CIN = COUT = 1uF 1M 1000 RT9016-28PB No Load 5 0 2 1 0 0.5 -50 -25 0 25 50 75 100 125 Time (500μs/Div) Temperature (°C) DS9016-03 August 2007 www.richtek.com 5 RT9016 Preliminary CIN = COUT = 1uF ILOAD = 10mA to 300mA RT9016-35PB VIN = 5.0V 200 0 50 0 -50 6 0 50 0 -50 Line Transient Response Line Transient Response RT9016-25PB ILOAD = 1mA 5 Output Voltage Deviation (mV) 4 Output Voltage Deviation (mV) 200 Time (500μs/Div) 10 0 -10 6 VIN = 4V to 5V COUT = 1uF RT9016-25PB ILOAD = 100mA 5 4 10 0 -10 Time (50μs/Div) Time (100μs/Div) Noise Noise RT9016-30PB ILOAD = 50mA VIN = 4.5V CIN = COUT = 1uF, X7R VIN = 4.5V CIN = COUT = 1uF, X7R 200 200 100 100 Noise (μV) Noise (μV) 400 Time (500μs/Div) VIN = 4V to 5V COUT = 1uF 0 -100 -200 RT9016-15PB ILOAD = 50mA 0 -100 -200 f = 10Hz to 100kHz Time (10ms/Div) www.richtek.com 6 CIN = COUT = 1uF ILOAD = 10mA to 400mA RT9016-35PB VIN = 5.0V Output Voltage Load Current Deviation (mV) (mA) 400 Load Transient Response Input Voltage Deviation (V) Input Voltage Deviation (V) Output Voltage Deviation (mV) Load Current (mA) Load Transient Response f = 10Hz to 100kHz Time (10ms/Div) DS9016-03 August 2007 Preliminary RT9016 Output Voltage (V) EN Pin Voltage (V) Start Up 10 VIN = 5V CIN = COUT = 1uF RT9016-28PB No Load 5 0 2 1 0 Time (10μs/Div) DS9016-03 August 2007 www.richtek.com 7 RT9016 Preliminary Applications Information Like any low-dropout regulator, the external capacitors used with the RT9016 must be carefully selected for regulator stability and performance. Using a capacitor whose value is > 1μF on the RT9016 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 RT9016 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 RT9016 output ensures stability. The RT9016 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 RT9016 and returned to a clean analog ground. Region of Stable COUT ESR vs. Load Current C OUT ESR (Ω) ESR (Ω) Region of Stable COUT 100.00 100 RT9016-15PB CIN = 1μF, X7R Unstable Region 10 10.00 COUT = 1uF 1.001 Stable Region 0.10 Bypass Capacitor and Low Noise 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. Enable Function The RT9016 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 RT9016 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 RT9016. 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. RT9016 lowers its OTP trip level from 165°C to 110°C when output short circuit occurs (VOUT < 0.4V) as shown in Figure 2. This limits IC case temperature under 100°C and provides maximum safety to end users when output short circuit occurs. For continue operation, do not exceed absolute maximum operation junction temperature 125°C. The power dissipation definition in device is : PD = (VIN−VOUT) x IOUT + VIN x IQ 0.01 Unstable Region (Simulation Verity) 0.00 0 100 200 300 Load Current (mA) Figure 1 www.richtek.com 8 400 500 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 : DS9016-03 August 2007 RT9016 Preliminary PD(MAX) = ( TJ(MAX) − TA ) /θJA 700 For recommended operating conditions specification of RT9016, 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 and WDFN-6L 2x2 package is 165°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) / 250 = 400mW (SOT-23-5) WDFN-6L 2x2 Power Dissipation (mW) 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. 600 500 SOT-23-5 400 300 200 100 0 0 25 50 75 100 125 150 Ambient Temperature (°C) Figure 3. Derating Curve for Packages PD(MAX) = (125°C−25°C) / 165 = 606mW V(DFN-6L 2x2) The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance θJA. For RT9016 packages, the Figure 3 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. VOUT Short to GND 0.4V VOUT IOUT TSD 165 °C 110 °C OTP Trip Point 110 °C IC Temperature 80 °C Figure 2. Short Circuit Thermal Folded Back Protection when Output Short Circuit Occurs DS9016-03 August 2007 www.richtek.com 9 RT9016 Preliminary Outline Dimension 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 www.richtek.com 10 DS9016-03 August 2007 RT9016 Preliminary D2 D L E E2 1 e b A A1 SEE DETAIL A 2 1 2 1 A3 DETAIL A Pin #1 ID and Tie Bar Mark Options Note : The configuration of the Pin #1 identifier is optional, but must be located within the zone indicated. Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 0.700 0.800 0.028 0.031 A1 0.000 0.050 0.000 0.002 A3 0.175 0.250 0.007 0.010 b 0.200 0.350 0.008 0.014 D 1.950 2.050 0.077 0.081 D2 1.000 1.450 0.039 0.057 E 1.950 2.050 0.077 0.081 E2 0.500 0.850 0.020 0.033 e L 0.650 0.300 0.026 0.400 0.012 0.016 W-Type 6L DFN 2x2 Package 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] DS9016-03 August 2007 www.richtek.com 11