RT9022GU6

Preliminary RT9022 High Voltage, Low Quiescent, 60mA LDO Regulator General Description The RT9022 is designed for positive CCD bias applications with critical performance and space requirements. The RT9022 performance is optimized for battery-powered systems to deliver low noise and low quiescent current and with soft start function. The RT9022 also works well with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications and consumes less than 1μA in shutdown mode. The other features include ultra low dropout voltage, high output accuracy, and current limiting protection. The part is available in the SOT-23-6, TSOT-23-6 and SC-70-6 packages. Features Low Quiescent Current (Typically 40μA) Wide Operating Voltage Ranges : 5V to 20V Ultra-Fast Transient Response Tight Load and Line Regulation Current Limiting Protection Thermal Shutdown Protection Adjustable Soft Start Time RoHS Compliant and 100% Lead (Pb)-Free Applications DSC Camcorder Pin Configurations (TOP VIEW) EN 6 1 VIN SS 5 2 FB 4 3 Ordering Information RT9022 Package Type E : SOT-23-6 J6 : TSOT-23-6 U6 : SC-70-6 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) 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. VIN GND VOUT SOT-23-6 / TSOT-23-6 / SC-70-6 Note : There is no pin1 indicator on top mark for SOT-23-6 and SC-70-6 type, and pin 1 will be lower left pin when reading top mark from left to right. Typical Application Circuit 1 1uF ON OFF 5 SS GND 2 6 EN VIN VOUT 3 1nF FB 4 R2 R1 2.2uF VOUT 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. RT9022 VOUT = VFB (1+ R1 )V R2 DS9022-00 September 2007 www.richtek.com 1 RT9022 Function Block Diagram EN Preliminary Shutdown and Logic Control VREF - VIN FB SS + MOS Driver VOUT Current Limit and Thermal Protection Error Amplifier Soft Start GND Functional Pin Description Pin Number Pin Name 1 2 3 4 5 6 VIN GND VOUT FB SS EN Pin Function Power Input Voltage. Ground. Output Voltage. Output Voltage Feedback. Soft Start and Noise Bypass. Chip Enable. (Active High) www.richtek.com 2 DS9022-00 September 2007 Preliminary Absolute Maximum Ratings (Note 1) RT9022 Supply Input Voltage, VIN -------------------------------------------------------------------------------------------- 21V Enable Voltage, VEN -------------------------------------------------------------------------------------------------- 18V Power Dissipation, PD @ TA = 25°C SOT-23-6/TSOT-23-6 -------------------------------------------------------------------------------------------------- 300mW SC-70-6 ------------------------------------------------------------------------------------------------------------------ 225mW Package Thermal Resistance (Note 4) SOT-23-6/TSOT-23-6, θJA -------------------------------------------------------------------------------------------- 250°C/W SC-70-6, θJA ------------------------------------------------------------------------------------------------------------ 333°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, VIN -------------------------------------------------------------------------------------------- 5V to 20V Junction Temperature Range ---------------------------------------------------------------------------------------- −40°C to 100°C Ambient Temperature Range ---------------------------------------------------------------------------------------- −40°C to 85°C Electrical Characteristics Parameter I nput Power Q uiescent Current S tandby Current R eference Voltage Feedback Voltage Feedback Voltage Tolerance Feedback Input Current S oft Start S oft Start Current O utput O utput Current Limit O utput Reverse Leakage Current D ropout Voltage P ower Supply Rejection Rate D ischarge Current (VIN = VEN = 15V, CIN = 1μF, COUT = 2.2μF, TA = 25°C, unless otherwise specified) Symbol Test Conditions IOUT = 0mA EN = GND VFB = VOUT , ILOAD = 1mA VFB = 1.3V Min ---−1.5 --- Typ 40 -1.25 -10 1.5 Max 80 1 -+1.5 --- Units μA μA V % nA μA ILIM VIN = 1 5V, VOUT = 1 4V, ROUT = 50 Ω VIN = U nconnected, Output set to 5V ILOAD = 30mA, VOUT = 1 4V f = 120Hz, VIN = V OUT + 1V, IOU T = 10mA f = 10KHz, V IN = VOUT + 1 V, IOU T = 10mA EN = High to Low, VOUT = 14V 60 ------ 80 30 0.2 65 55 20 --0.3 ---- mA μA V dB dB mA To be continued DS9022-00 September 2007 www.richtek.com 3 RT9022 Parameter EN E N Input Current E N High-Level Input Voltage E N Low-Level Input Voltage Thermal Protection Thermal Shutdown T emperature Thermal Shutdown Hysteresis Symbol Preliminary Test Conditions Min −1 2.4 -Typ Max Units μA V V EN = 15V ---- 3 -0.6 VEN_ H VEN_ L --- 135 10 --- °C °C 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 TA = 25°C on a low effective thermal conductivity test board (single-layer, 1S) of JEDEC 51-3 thermal measurement standard. www.richtek.com 4 DS9022-00 September 2007 Preliminary Typical Operating Characteristics Output Voltage vs. Temperature 16.0 RT9022 Quiescent Current vs. Temperature 60 VIN = 18V, ILOAD = 0mA VIN = 5V, VOUT = 1.25V Output Voltage (V) 15.5 Quiescent Current (uA) 55 50 15.0 45 14.5 40 14.0 -50 -25 0 25 50 75 100 35 -50 -25 0 25 50 75 100 Temperature (°C) Temperature (°C) Feedback Voltage vs. Temperature 1.30 Dropout Voltage vs. Load Current 400 VIN = 5V VOUT = 15V TJ = 100°C Dropout Voltage (mV) Feedback Voltage (V) 1.28 300 TJ = 25°C 1.26 200 1.24 TJ = −40°C 100 1.22 1.20 -50 -25 0 25 50 75 100 0 0 10 20 30 40 50 60 Temperature (°C) Load Current (mA) Line Transient Response VOUT = 15V, ILOAD = 3mA Line Transient Response VOUT = 15V, ILOAD = 20mA VIN 18 (V) 17 VIN 18 (V) 17 VOUT (10mV/Div) VOUT (10mV/Div) Time (1ms/Div) Time (1ms/Div) DS9022-00 September 2007 www.richtek.com 5 RT9022 Load Transient Response VIN = 18V, VOUT = 15V ILOAD = 3mA to 20mA Preliminary Load Transient Response VIN = 18V, VOUT = 15V ILOAD = 3mA to 50mA I LOAD (20mA/Div) I LOAD (50mA/Div) VOUT (5mV/Div) VOUT (5mV/Div) Time (1ms/Div) Time (1ms/Div) 20 PSRR VIN = VEN = 6.9V to 7V, VOUT = 5V ILOAD = 10mA Power On/Off VIN = 18V, VOUT = 15V, ILOAD = 20mA 0 VEN (10V/Div) PSRR (dB) -20 -40 VOUT (10V/Div) I IN (100mA/Div) 0.01 10 0.1 100 1 1000 10 10000 100 100000 1000 1000000 -60 -80 Time (2.5ms/Div) Frequence (kHz) (Hz) Region of Stable COUT ESR vs. Load Current 100.00 VIN = 18V, VOUT = 15V CIN = 1μF/X7R, COUT = 2.2μF/X5R Unstable Region 10.00 C OUT ESR (Ω) 1.00 0.10 Stable Region 0.01 0 10 20 30 40 50 60 Load Current (A) www.richtek.com 6 DS9022-00 September 2007 Preliminary Application Information Enable The RT9022 goes into sleep mode when the Enable pin is in a logic low condition. During this condition, the pass transistor, error amplifier, and bandgap are turned off, reducing the supply current to 1μA. The Enable input is a CMOS logic and cannot be left floating. Output capacitor The RT9022 is specifically designed to use ceramic output capacitors as low as 2.2μF. Ceramic capacitors below 10μF offer significant cost and space saving, along with high frequency noise filtering. The RT9022 doesn't rely on a zero, which is generated by output capacitor ESR. So, the output capacitor ESR is not sensitive and very low ESR is allowed. Input capacitor A 1μF input capacitor or greater located as close as possible to the IC is recommended. Larger input capacitor value with lower ESR provides better power supply noise rejection and line transient response. Larger load current requires larger capacitor value. PSRR The power supply rejection ratio (PSRR) is defined as the gain from the input to output divided by the gain from the supply to the output. The PSRR is found to be Thermal Consideration RT9022 Thermal protection limits power dissipation in the RT9022. When the operating junction temperature exceeds 135°C, the OTP circuit starts the thermal shutdown function and turns the pass element off. The pass element turns on again after the junction temperature cools by 10°C. For continuous 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 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 100°C, TA is the ambient temperature and the θJA is the junction to ambient thermal resistance. For recommended operating conditions specification of the RT9022, where TJ(MAX) is the maximum junction temperature of the die (100°C) and TA is the maximum ambient temperature. The junction to ambient thermal resistance ( θJA is layout dependent) for T/SOT-23-6 package is 250°C/W, and SC-70-6 package is 333°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) = (100 °C − 25 °C) / 250 °C/W = 300mW for T/SOT-23-6 package PD(MAX) = (100 °C − 25 °C) / 333 °C/W = 225mW for SC-70-6 package The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance θJA. For the RT9022 packages, the Figure 1 of de-rating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. ⎛ ⎞ PSRR = 20 × log ⎜ ΔGain Error ⎟ ⎝ ΔSupply ⎠ Note that when heavy load is measured, Δsupply will cause Δtemperature. And Δtemperature will cause Δoutput voltage. So the temperature effect must be taken into consideration. Current Limit The RT9022 contains an independent current limiter, which monitors and controls the pass transistor's gate voltage to limit the output current to 80mA typically. It protects the part even directly short the output to GND. DS9022-00 September 2007 www.richtek.com 7 RT9022 400 350 Preliminary Single Layer PCB Power Dissipation (mW) 300 250 200 150 100 50 0 0 10 20 30 40 50 60 70 80 90 100 T/SOT-23-6 SC-70-6 Ambient Temperature (°C) Figure 1. De-rating Curves www.richtek.com 8 DS9022-00 September 2007 Preliminary Outline Dimension RT9022 H D L C B b A A1 e Symbol A A1 B b C D e H L Dimensions In Millimeters Min 0.889 0.000 1.397 0.250 2.591 2.692 0.838 0.080 0.300 Max 1.295 0.152 1.803 0.560 2.997 3.099 1.041 0.254 0.610 Dimensions In Inches Min 0.031 0.000 0.055 0.010 0.102 0.106 0.033 0.003 0.012 Max 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024 SOT-23-6 Surface Mount Package DS9022-00 September 2007 www.richtek.com 9 RT9022 Preliminary H D L C B b A A1 e Symbol A A1 B b C D e H L Dimensions In Millimeters Min 0.700 0.000 1.397 0.300 2.591 2.692 0.838 0.080 0.300 Max 1.000 0.100 1.803 0.559 3.000 3.099 1.041 0.254 0.610 Dimensions In Inches Min 0.028 0.000 0.055 0.012 0.102 0.106 0.033 0.003 0.012 Max 0.039 0.004 0.071 0.022 0.118 0.122 0.041 0.010 0.024 TSOT-23-6 Surface Mount Package www.richtek.com 10 DS9022-00 September 2007 P reliminary RT9022 H D L C B b A A1 e Symbol A A1 B b C D e H L Dimensions In Millimeters Min 0.800 0.000 1.150 0.150 1.800 1.800 0.650 0.080 0.210 0.260 0.460 Max 1.100 0.100 1.350 0.400 2.450 2.250 Dimensions In Inches Min 0.031 0.000 0.045 0.006 0.071 0.071 0.026 0.003 0.008 0.010 0.018 Max 0.044 0.004 0.054 0.016 0.096 0.089 SC-70-6 Surface Mount 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 DS9022-00 September 2007 www.richtek.com 11