RT9002B-PS

RT9002A/B/C Dual Low-Dropout Regulator with Detector General Description The RT9002A/B/C is a dual-channel, low noise, and low dropout regulator. The first regulator is capable of sourcing 240mA, while the second regulator can source up to 500mA and includes a voltage detection function. The RT9002A/B/C performance is optimized for CD/DVD-ROM, CD/RW or wireless communication supply applications. The RT9002A/B/C regulator is stable with output capacitors as low as 1μF. The other features include high output accuracy, ultra-fast transient response, tight load and line regulation, current limiting/thermal protection and high ripple rejection ratio. The RT9002A/B/C is available in SOP-8 package requiring minimum board space and smallest components. Features Low Quiescent Current (Typically 70μA) Wide Operating Voltage Ranges : 2.5V to 5.5V Ultra-Fast Transient Response Tight Load and Line Regulation Current Limiting Protection Thermal Shutdown Protection Only low-ESR Ceramic Capacitors Required for Stability Custom LDO VOUT1, VOUT2 Voltage Available from 1.5V to 3.3V Custom VIN Detector Available from 3.5V to 4.0V RoHS Compliant and 100% Lead (Pb)-Free Applications Ordering Information RT9002A/B/C Package Type S : SOP-8 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Output Voltage : VOUT1/VOUT2 A : 2.5V/3.3V B : 1.5V/2.8V C : 2.5V/3.3V CD/DVD-ROM, CD/RW Wireless LAN Card/Keyboard/Mouse Battery-Powered Equipment XDSL Router Pin Configurations (TOP VIEW) VIN1 VOUT1 Cd VIN2 2 3 4 8 7 6 5 EN1 GND VDOUT VOUT2 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. SOP-8 Typical Application Circuit VIN1 1 CIN1 1uF 8 VIN1 VOUT1 2 3 Cd 6 5 COUT2 1uF COUT1 1uF R1 100k VOUT1 RT9002A/B/C Cd EN1 VDOUT Chip Enable VIN2 VDOUT VOUT2 VIN2 4 CIN2 1uF VIN2 GND 7 VOUT2 DS9002ABC-03 March 2007 www.richtek.com 1 RT9002A/B/C Functional Pin Description Pin No. 1 2 3 4 5 6 7 8 Pin Name VIN1 VOUT1 Cd VIN2 VOUT2 VDOUT GND EN1 Channel 1 Supply Input. Channel 1 Output Voltage. Delay Capacitor. Channel 2 Supply Voltage. Channel 2 Output Input. Detector Output Voltage. (RT9002A = Active High, RT9002B and RT9002C = Active Low) Common Ground. Chip Enable (Active High) for Channel 1. Pin Function Function Block Diagram EN1 Shutdown and Logic Control VREF + Error Amplifier VIN1 MOS Driver VOUT1 Current-Limit and Thermal Protection VIN2 + Cd Error Amplifier MOS Driver Current-Limit and Thermal Protection VOUT2 - VREF VDOUT + VD Comparator GND www.richtek.com 2 DS9002ABC-03 March 2007 RT9002A/B/C Absolute Maximum Ratings (Note 1) Supply Input Voltage -------------------------------------------------------------------------------------------------- 6V Package Thermal Resistance (Note 4) SOP-8, θJA -------------------------------------------------------------------------------------------------------------- 110°C/W Power Dissipation, PD @ TA = 25°C SOP-8 -------------------------------------------------------------------------------------------------------------------- 0.909W 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 -------------------------------------------------------------------------------------------------- 2.5V to 5.5V Chip Enable Input Voltage ------------------------------------------------------------------------------------------- 0V to 5.5V Junction Temperature Range ---------------------------------------------------------------------------------------- −40°C to 125°C Ambient Temperature Range ---------------------------------------------------------------------------------------- −40°C to 125°C Electrical Characteristics Parameter Regulator 1 RT9002A Output Voltage Accuracy RT9002B RT9002C Maximum Output Current Load Regulation Dropout Voltage Quiescent Current Standby Current Line Regulation Power Supply Rejection Rate Current Limit EN Threshold Logic-Low Voltage Logic-High Voltage (Note 5) (Note 6) (Note 7) (VIN = VOUT + 1V, whichever is greater, CIN = 1μF, COUT = 1μF, TA = 25°C, unless otherwise specified) Symbol Test Conditions Min 2.45 Typ 2.50 1.50 2.50 -1 50 150 30 0.1 0.01 −60 450 --170 Max 2.55 1.53 2.55 -----1 0.2 --0.6 --- Units ΔVOUT1 IOUT1_MAX ΔVLOAD1 VDROP1_1 VDROP1_2 IQ1 ISTB1 ΔVLINE1 PSRR1 ILIM1 VIL VIH TSD1 IOUT1 = 30mA 1.47 2.45 240 V mA mV mV μA μA %/V dB mA V °C 1mA < IOUT1 < 100mA IOUT1 = 30mA IOUT1 = 100mA VIN1 = VEN1 = 3.5V, IOUT1 = 0mA VIN1 = 3.5V, VEN1 = 0V VIN1 = 3.5V to 5.5V, VIN1 = VEN1, IOUT1 = 30mA f = 100Hz, IOUT1 = 100mA VIN1 = VEN1 = 5V ---------1.8 -- Thermal Shutdown Protection To be continued DS9002ABC-03 March 2007 www.richtek.com 3 RT9002A/B/C Parameter Thermal Shutdown Hysteresis Enable Pin Current Regulator 2 RT9002A Output Voltage Accuracy RT9002B RT9002C Maximum Output Current Load Regulation Dropout Voltage Quiescent Current Line Regulation Power Supply Rejection Rate Current Limit Thermal Shutdown Protection Thermal Shutdown Hysteresis Detector RT9002A Detect Fall Voltage RT9002B RT9002C Hysteresis RT9002A Sink Current RT9002B RT9002C IDOUT ΔVHYS VDOUT = 0.5V, VIN2 = 5.0V VDOUT = 0.5V, VIN2 = 2.0V VDF 3.528 3.822 3.528 VDF x0.02 7.0 4.0 4.0 3.60 3.9 3.60 VDF x0.05 12.0 8.0 8.0 3.672 3.978 3.672 VDF x0.08 ---mA V V (Note 5) (Note 6) (Note 7) IOUT2_MAX ΔVLOAD2 VDROP2_1 VDROP2_2 IQ2 ΔVLINE2 PSRR2 ILIM2 TSD2 ΔTSD2 1mA < IOUT2 < 100mA IOUT2 = 30mA IOUT2 = 100mA VIN2 = 4.3V, IOUT2 = 0mA VIN2 = 4.3V to 5.5V, IOUT2 = 30mA f = 100Hz, IOUT2 = 100mA VIN2 = 5V ΔVOUT2 IOUT2 = 30mA 3.234 2.744 3.234 500 ---------3.30 2.80 3.30 -15 50 150 40 0.01 −60 800 170 40 3.366 2.856 3.366 -50 90 200 -0.2 ----mA mV mV μA %/V dB mA °C °C V Symbol ΔTSD1 IEN VIN = 3.5V, Enable Test Conditions Min --Typ 40 0.1 Max -1 Units °C μA www.richtek.com 4 DS9002ABC-03 March 2007 RT9002A/B/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 high effective thermal conductivity test board of JEDEC 51-7 2S2P 4-layer 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 100mA. Note 6. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) − 100mV. Note 7. 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. DS9002ABC-03 March 2007 www.richtek.com 5 RT9002A/B/C Typical Operating Characteristics Input Voltage vs. Detector Voltage 7 6 Input Voltage vs. Detector Voltage 7 6 RT9002A RT9002B Reset Voltage (V) Reset Voltage (V) 125 6 5 4 3 2 1 0 0 1 2 3 4 5 5 4 3 2 1 0 0 1 2 3 4 5 6 Input Voltage (V) Input Voltage (V) Output Voltage vs. Temperature 3.6 3.4 Output Voltage vs. Temperature 3.0 RT9002A V OUT2 RT9002B 2.8 V OUT2 Output Voltage (V) 3.2 3.0 2.8 2.6 2.4 2.2 -50 -25 0 25 50 75 100 125 Output Voltage (V) 2.6 2.4 2.2 2.0 1.8 1.6 1.4 -50 -25 0 25 50 75 100 125 V OUT1 V OUT1 Temperature (°C) Temperature (°C) Quiescent Current vs. Input Voltage 45 42.5 Quiescent Current vs. Input Voltage 45 42.5 RT9002A RT9002B Quiescent Current (uA) Quiescent Current (uA) 40 37.5 35 32.5 30 27.5 25 2.5 3 3.5 4 4.5 5 5.5 40 37.5 35 V OUT2 V OUT2 V OUT1 32.5 30 27.5 25 2.5 3 3.5 4 4.5 5 5.5 V OUT1 Input Voltage (V) Input Voltage (V) www.richtek.com 6 DS9002ABC-03 March 2007 RT9002A/B/C Nch Driver Sink Current vs. Input Voltage 60 Nch Driver Sink Current vs. Input Voltage 60 RT9002A Nch Driver Output Current (mA) Nch Driver Output Current (mA) -40°C 25°C 125°C RT9002B -40°C 50 40 30 20 10 0 0 1 2 3 4 50 40 30 20 10 0 25°C 125°C 5 6 0 1 2 3 4 5 6 Input Voltage (V) Input Voltage (V) Nch Driver Sink Current vs. VDS 200 Nch Driver Sink Current vs. VDS 110 RT9002A Nch Driver Output Current (mA) Nch Driver Output Current (mA) 175 150 125 100 75 50 25 0 0 1 2 3 100 90 80 70 60 50 40 30 20 10 0 0 RT9002B VDD = 3.5V VDD = 3V VDD = 2.5V VDD = 2V VDD = 1.5V VDD = 0.5V 1 2 3 4 VDD = 5V VDD = 5.5V VDD = 4.5V VDD = 1V 5 6 4 5 6 VDS (V) VDS (V) Output Delay Time vs. Load Capacitance 1000 Output Delay Time vs. Load Capacitance 1000 RT9002A RT9002B Output Delay Time (ms) 10 Output Delay Time (us) 100 100 10 1 1 0.1 0.1 0.01 0.0000 0.0001 0.0010 0.0100 0.1000 0.01 0.0000 0.0001 0.0010 0.0100 0.1000 Load Capacitance (uF) Load Capacitance (uF) DS9002ABC-03 March 2007 www.richtek.com 7 RT9002A/B/C Dropout Voltage vs. Load Current 400 350 Dropout Voltage vs. Load Current 600 RT9002A, VOUT1 = 2.5V 125°C 25°C RT9002C, VOUT2 = 3.3V 125°C 25°C 500 Dropout Voltage (mV) 300 250 200 150 100 50 0 0 50 100 150 200 Dropout Voltage (mV) 400 300 -40°C -40°C 200 100 0 250 300 0 0.1 0.2 0.3 0.4 0.5 Load Current (mA) Load Current (A) EN Pin Shutdown Response Shutdown Voltage (5V/Div) RT9002A, VOUT1 ILOAD = 75mA Line Transient Response RT9002A Boost ILOAD = 50mA VOUT (1V/Div) 4 VOUT1 (20mV/Div) VOUT2 (20mV/Div) 5 VOUT (1V/Div) Time (100μs/Div) Time (250μs/Div) Load Transient Response Shutdown Voltage (5V/Div) RT9002A ILOAD = 10mA to 100mA RT9002A, VOUT1 ILOAD = 75mA Start Up IOUT1 (100mA/Div) VOUT1 (5mV/Div) VOUT2 (50mV/Div) Time (500μs/Div) VOUT (1V/Div) Time (10μs/Div) www.richtek.com 8 DS9002ABC-03 March 2007 RT9002A/B/C Noise 600 400 RT9002B, VOUT1 IOUT1 = 100mA 600 400 RT9002B, VOUT1 No Load Noise Noise (μV/Div) 200 0 -200 -400 -600 Noise (μV/Div) 200 0 -200 -400 -600 Time (10ms/Div) Time (10ms/Div) DS9002ABC-03 March 2007 www.richtek.com 9 RT9002A/B/C Applications Information Like any low-dropout regulator, the external capacitors used with the RT9002A/B/C must be carefully selected for regulator stability and performance. Using a capacitor whose value is > 1μF on the RT9002A/B/C 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 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 RT9002A/B/C is designed specifically to work with low ESR ceramic output capacitor in spacesaving and performance consideration. Using a ceramic capacitor whose value is at least 1μF with ESR is > 20mΩ on the RT9002 A/B/C o utput ensures stability. The RT9002A/B/C 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 RT9002A/B/C and returned to a clean analog ground. Enable The RT9002A/B/C 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 0.1μA typical. The Enable pin may be directly tied to VIN to keep the part on. The Enable input is CMOS logic and cannot be left floating. 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 ⎛ ⎞ PSRR = 20 × log ⎜ Δ Gain Error ⎟ Δ Supply ⎠ ⎝ Note that when heavy load measuring, Δsupply will cause Δtemperature. And Δtemperature will cause Δoutput voltage. So the heavy load PSRR measuring is include temperature effect. Current Limit The RT9002A/B/C contains an independent current limiter, which monitors and controls the pass transistor's gate voltage, limiting the output1/2 current to 0.45/0.8A (typ.). The output can be shorted to ground indefinitely without damaging the part. Thermal-Shutdown Protection Thermal-shutdown protection limits total power dissipation in the RT9002A/B/C. When the junction temperature exceeds TJ = +170°C, the thermal sensor signals the shutdown logic, turning off the pass transistor and allowing the IC to cool. The thermal sensor turns the pass transistor on again after the IC's junction temperature cools by 40°C, resulting in a pulsed output during continuous thermal overload conditions. Thermal-shutdown protection is designed to protect the RT9002A/B/C in the event of fault conditions. For continual operation, do not exceed the absolute maximum junction temperature rating of TJ = +125°C. Region of Stable COUT ESR vs. Load Current 100 Region of Stable C OUT ESR () Region of Stable COUT ESR (ΩΩ) 10 RT9002APS VIN = 4.0V, VOUT2 = 3.3V CIN = COUT = 1uF/X7R Unstable Region 1 0.1 Stable Region 0.01 Unstable Region (Simulation Verify) 0.001 0 50 100 150 200 250 300 Load Current (mA) Figure 1 www.richtek.com 10 DS9002ABC-03 March 2007 RT9002A/B/C Outline Dimension A H M J B F C I D Dimensions In Millimeters Symbol Min A B C D F H I J M 4.801 3.810 1.346 0.330 1.194 0.170 0.050 5.791 0.400 Max 5.004 3.988 1.753 0.508 1.346 0.254 0.254 6.200 1.270 Dimensions In Inches Min 0.189 0.150 0.053 0.013 0.047 0.007 0.002 0.228 0.016 Max 0.197 0.157 0.069 0.020 0.053 0.010 0.010 0.244 0.050 8-Lead SOP 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 DS9002ABC-03 March 2007 www.richtek.com 11