RT9002A/B/C Dual Low Dropout Regulator with Detector General Description Features 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. z z z z z z z z z z μA) Low Quiescent Current (Typically 70μ 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 4V RoHS Compliant and 100% Lead (Pb)-Free Applications Ordering Information z RT9002A/B/C - z Package Type S : SOP-8 z z Lead Plating System P : Pb Free G : Green (Halogen Free and Pb Free) Note : CD/DVD-ROM, CD/RW Wireless LAN Card/Keyboard/Mouse Battery-Powered Equipment XDSL Router Pin Configurations Output Voltage : VOUT1/VOUT2 A : 2.5V/3.3V B : 1.5V/2.8V C : 2.5V/3.3V (TOP VIEW) EN1 2 7 GND Cd 3 6 VDOUT VIN2 4 5 VOUT2 VIN1 Richtek products are : ` 8 VOUT1 RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. ` SOP-8 Suitable for use in SnPb or Pb-free soldering processes. Typical Application Circuit VIN1 1 CIN1 1uF Chip Enable VIN1 VOUT1 RT9002A/B/C Cd 8 EN1 VDOUT VIN2 DS9002ABC-04 April 2011 4 CIN2 1uF VIN2 VOUT2 GND 7 2 3 Cd COUT1 1uF R1 100k 6 VOUT1 VIN2 VDOUT 5 COUT2 1uF VOUT2 www.richtek.com 1 RT9002A/B/C Functional Pin Description Pin No. Pin Name Pin Function 1 VIN1 Channel 1 Supply Input. 2 VOUT1 Channel 1 Output Voltage. 3 Cd Delay Capacitor. 4 VIN2 Channel 2 Supply Voltage. 5 VOUT2 Channel 2 Output Input. 6 VDOUT Detector Output Voltage. (RT9002A = Active High, RT9002B and RT9002C = Active Low) 7 GND Common Ground. 8 EN1 Chip Enable (Active High) for Channel 1. Function Block Diagram EN1 Shutdown and Logic Control VIN1 VREF + MOS Driver - Error Amplifier VOUT1 Current-Limit and Thermal Protection VIN2 + MOS Driver - Cd Error Amplifier VREF Current-Limit and Thermal Protection VOUT2 VDOUT + GND VD Comparator www.richtek.com 2 DS9002ABC-04 April 2011 RT9002A/B/C Absolute Maximum Ratings z z z z z z z (Note 1) Supply Input Voltage ------------------------------------------------------------------------------------------------ 6V Package Thermal Resistance (Note 2) 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 3) HBM (Human Body Mode) ----------------------------------------------------------------------------------------- 2kV MM (Machine Mode) ------------------------------------------------------------------------------------------------ 200V Recommended Operating Conditions z z z z (Note 4) 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 (VIN = VOUT + 1V, whichever is greater, CIN = 1μF, COUT = 1μF, TA = 25° C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit 2.45 2.5 2.55 1.47 1.5 1.53 2.45 2.5 2.55 240 -- -- mA mV Regulator 1 RT9002A Output Voltage Accuracy RT9002B ΔVOUT1 IOUT1 = 30mA RT9002C V Maximum Output Current IOUT1_MAX Load Regulation (Note 5) ΔVLOAD1 1mA < IOUT1 < 100mA -- 1 -- Dropout Voltage (Note 6) VDROP1_1 IOUT1 = 30mA -- 50 -- VDROP1_2 IOUT1 = 100mA -- 150 -- IQ1 VIN1 = VEN1 = 3.5V, IOUT1 = 0mA -- 30 -- μA Standby Current ISTB1 VIN1 = 3.5V, VEN1 = 0V -- 0.1 1 μA Line Regulation ΔVLINE1 -- 0.01 0.2 %/V Power Supply Rejection Rate PSRR1 f = 100Hz, IOUT1 = 100mA -- −60 -- dB Current Limit ILIM1 VIN1 = VEN1 = 5V -- 450 -- mA Quiescent Current (Note 7) EN Threshold Voltage VIN1 = 3.5V to 5.5V, VIN1 = VEN1, I OUT1 = 30mA Logic-Low VIL -- -- 0.6 Logic-High VIH 1.8 -- -- -- 170 -- Thermal Shutdown Protection TSD1 mV V °C To be continued DS9002ABC-04 April 2011 www.richtek.com 3 RT9002A/B/C Parameter Symbol Thermal Shutdown Hysteresis ΔTSD1 Enable Pin Current IEN Test Conditions VIN = 3.5V, Enable Min Typ Max Unit -- 40 -- °C -- 0.1 1 μA 3.234 3.3 3.366 2.744 2.8 2.856 3.234 3.3 3.366 500 -- -- mA mV Regulator 2 RT9002A Output Voltage Accuracy RT9002B ΔVOUT2 IOUT2 = 30mA RT9002C V Maximum Output Current IOUT2_MAX Load Regulation (Note 5) ΔVLOAD2 1mA < IOUT2 < 100mA -- 15 50 Dropout Voltage (Note 6) VDROP2_1 IOUT2 = 30mA -- 50 90 VDROP2_2 IOUT2 = 100mA -- 150 200 IQ2 VIN2 = 4.3V, IOUT2 = 0mA -- 40 -- μA Line Regulation ΔVLINE2 VIN2 = 4.3V to 5.5V, IOUT2 = 30mA -- 0.01 0.2 %/V Power Supply Rejection Rate PSRR2 f = 100Hz, IOUT2 = 100mA -- −60 -- dB Current Limit ILIM2 VIN2 = 5V -- 800 -- mA Thermal Shutdown Protection T SD2 -- 170 -- °C -- 40 -- °C 3.528 3.6 3.672 3.822 3.9 3.978 3.528 3.6 3.672 VDF x0.02 V DF x0.05 VDF x0.08 7 12 -- 4 8 -- 4 8 -- Quiescent Current (Note 7) Thermal Shutdown Hysteresis ΔTSD2 mV Detector RT9002A Detect Fall Voltage RT9002B VDF RT9002C ΔVHYS Hysteresis RT9002A Sink Current RT9002B RT9002C www.richtek.com 4 VD OUT = 0.5V, V IN2 = 5.0V IDOUT VD OUT = 0.5V, V IN2 = 2.0V V V mA DS9002ABC-04 April 2011 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. 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 3. Devices are ESD sensitive. Handling precaution recommended. Note 4. The device is not guaranteed to function outside its operating conditions. 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-04 April 2011 www.richtek.com 5 RT9002A/B/C Typical Operating Characteristics Input Voltage vs. Detector Voltage Input Voltage vs. Detector Voltage 7 RT9002A 6 6 5 5 Reset Voltage (V) Reset Voltage (V) 7 4 3 2 RT9002B 4 3 2 1 1 0 0 0 1 2 3 4 5 125 6 0 1 2 Output Voltage vs. Temperature RT9002A Output Voltage (V) Output Voltage (V) RT9002B 3.2 3.0 2.8 V OUT1 2.4 2.6 2.4 2.2 2.0 1.8 1.6 2.2 V OUT1 1.4 -50 -25 0 25 50 75 100 125 -50 -25 Temperature (°C) 25 50 75 100 125 Quiescent Current vs. Input Voltage 45 RT9002A RT9002B 42.5 Quiescent Current (uA) 42.5 Quiescent Current (uA) 0 Temperature (°C) Quiescent Current vs. Input Voltage 45 6 V OUT2 2.8 V OUT2 2.6 5 Output Voltage vs. Temperature 3.0 3.4 4 Input Voltage (V) Input Voltage (V) 3.6 3 40 V OUT2 37.5 35 32.5 V OUT1 30 V OUT2 40 37.5 35 V OUT1 32.5 30 27.5 27.5 25 25 2.5 3 3.5 4 4.5 Input Voltage (V) www.richtek.com 6 5 5.5 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) DS9002ABC-04 April 2011 RT9002A/B/C Nch Driver Sink Current vs. Input Voltage Nch Driver Sink Current vs. Input Voltage 60 RT9002A -40°C Nch Driver Output Current (mA) Nch Driver Output Current (mA) 60 50 25°C 40 125°C 30 20 10 RT9002B 50 -40°C 40 25°C 30 125°C 20 10 0 0 0 1 2 3 4 5 0 6 1 2 RT9002A VDD = 5V Nch Driver Output Current (mA) Nch Driver Output Current (mA) 110 VDD = 5.5V 150 125 VDD = 4.5V 100 75 50 25 0 RT9002B 100 VDD = 3.5V 90 80 VDD = 3V 70 60 VDD = 2.5V 50 VDD = 2V 40 30 VDD = 1.5V 20 10 VDD = 0.5V 1 2 3 4 5 0 6 1 2 VDD = 1V 1000 RT9002A Output Delay Time (us) 100 10 1 0.1 0.0001 0.0010 0.0100 Load Capacitance (uF) DS9002ABC-04 April 2011 4 5 6 Output Delay Time vs. Load Capacitance Output Delay Time vs. Load Capacitance 0.01 0.0000 3 VDS (V) VDS (V) Output Delay Time (ms) 6 0 0 1000 5 Nch Driver Sink Current vs. VDS Nch Driver Sink Current vs. VDS 175 4 Input Voltage (V) Input Voltage (V) 200 3 0.1000 RT9002B 100 10 1 0.1 0.01 0.0000 0.0001 0.0010 0.0100 0.1000 Load Capacitance (uF) www.richtek.com 7 RT9002A/B/C Dropout Voltage vs. Load Current 400 RT9002A, VOUT1 = 2.5V 125°C 300 25°C 250 200 -40°C 150 100 50 0 125°C 25°C 400 300 -40°C 200 100 0 0 50 100 150 200 250 300 0 0.1 0.2 0.3 0.4 Load Current (mA) Load Current (A) EN Pin Shutdown Response Line Transient Response 0.5 RT9002A Boost ILOAD = 50mA RT9002A, VOUT1 ILOAD = 75mA 5 VOUT (1V/Div) 4 VOUT1 (20mV/Div) VOUT (1V/Div) VOUT2 (20mV/Div) Time (100μs/Div) Time (250μs/Div) Load Transient Response Start Up RT9002A ILOAD = 10mA to 100mA IOUT1 (100mA/Div) VOUT2 (50mV/Div) Time (500μs/Div) www.richtek.com 8 RT9002A, VOUT1 ILOAD = 75mA VOUT (1V/Div) VOUT1 (5mV/Div) Shutdown Voltage (5V/Div) Shutdown Voltage (5V/Div) RT9002C, VOUT2 = 3.3V 500 Dropout Voltage (mV) 350 Dropout Voltage (mV) Dropout Voltage vs. Load Current 600 Time (10μs/Div) DS9002ABC-04 April 2011 RT9002A/B/C Noise 600 Noise RT9002B, VOUT1 IOUT1 = 100mA 600 400 Noise (μV/Div) Noise (μV/Div) 400 RT9002B, VOUT1 No Load 200 0 -200 200 0 -200 -400 -400 -600 -600 Time (10ms/Div) DS9002ABC-04 April 2011 Time (10ms/Div) 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 RT9002A/B/C output 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. Region of Stable COUT ESR vs. Load Current Region of Region of Stable Stable C COUT ESR(Ω) (Ω) OUTESR 100 RT9002APS VIN = 4.0V, VOUT2 = 3.3V CIN = COUT = 1uF/X7R 10 Unstable Region 1 Stable Region 0.1 0.01 Unstable Region (Simulation Verify) 0.001 0 50 100 150 200 250 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. 300 Load Current (mA) Figure 1 www.richtek.com 10 DS9002ABC-04 April 2011 RT9002A/B/C Outline Dimension H A M J B F C I D Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 4.801 5.004 0.189 0.197 B 3.810 3.988 0.150 0.157 C 1.346 1.753 0.053 0.069 D 0.330 0.508 0.013 0.020 F 1.194 1.346 0.047 0.053 H 0.170 0.254 0.007 0.010 I 0.050 0.254 0.002 0.010 J 5.791 6.200 0.228 0.244 M 0.400 1.270 0.016 0.050 8-Lead SOP Plastic Package Richtek Technology Corporation Richtek Technology Corporation Headquarter Taipei Office (Marketing) 5F, No. 20, Taiyuen Street, Chupei City 5F, No. 95, Minchiuan Road, Hsintien City Hsinchu, Taiwan, R.O.C. Taipei County, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Tel: (8862)86672399 Fax: (8862)86672377 Email: [email protected] Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek 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 Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek. DS9002ABC-04 April 2011 www.richtek.com 11