® RT9054 Portable Power Management 300mA Dual LDO Regulator General Description Features The RT9054 is a dual channel, low noise, and low dropout regulator sourcing up to 300mA at each channel. The range of output voltage is from 1.2V to 3.6V by operating from 2.5V to 5.5V input. z Wide Operating Voltage Ranges : 2.5V to 5.5V z Low-Noise for RF Application No Noise Bypass Capacitor Required Fast Response in Line/Load Transient TTL-Logic-Controlled Shutdown Input Low Temperature Coefficient Dual LDO Outputs (300mA/300mA) Ultra-low Quiescent Current 27μ μA/LDO High Output Accuracy 3% Short Circuit Protection Thermal Shutdown Protection Current Limit Protection Short Circuit Thermal Folded Back Protection Tiny 6-Lead WDFN Packages RoHS Compliant and Halogen Free The RT9054 offers 3% accuracy, extremely low dropout voltage (240mV @ 300mA), and extremely low ground current, only 27μA per LDO. The shutdown current is near zero current which is suitable for battery-power devices. Other features include current limiting, over temperature and output short circuit protection. z z z z z z z z z The RT9054 is short circuit thermal folded back protected. The IC lowers its OTP trip point from 165°C to 110°C when output short circuit occurs (V OUT < 0.4V) providing maximum safety to end users. The RT9054 can operate stably with very small ceramic output capacitors, reducing required board space and component cost. The RT9054 is available in fixed output voltages in the WDFN-6L 1.6x1.6 packages. z z z z Applications z z z z Ordering Information z RT9054- z Package Type QW : WDFN-6L 1.6x1.6 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Note : Output Voltage : VOUT1/VOUT2 VOUT2 > VOUT1 is Recommended Richtek 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. Copyright © 2012 Richtek Technology Corporation. All rights reserved. DS9054-03 February 2012 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. Available Voltage Version Code Voltage Code Voltage Code Voltage A D G K N R V Y 3.5 1.85 1.8 2.6 2.85 3.2 2.9 1.9 B E H L P S W U 1.3 2.1 2 2.7 3 3.3 1.6 1.4 C F J M Q T X 1.2 1.5 2.5 2.8 3.1 2.65 3.15 is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT9054 Pin Configurations (TOP VIEW) VIN EN1 EN2 6 1 2 GND 7 3 5 4 VOUT1 VOUT2 GND WDFN-6L 1.6x1.6 Typical Application Circuit VIN VOUT1 VIN CIN 1µF Chip Enable RT9054 EN1 VOUT2 EN2 COUT1 VOUT1 4.7µF/X7R COUT2 VOUT2 4.7µF/X7R GND Functional Pin Description Pin No. Pin Name Pin Function 1 VIN Supply Input. 2 EN1 Chip Enable1. 3 EN2 Chip Enable2. 4, 7 (Exposed Pad) GND Common Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. 5 VOUT2 Channel 2 Output Voltage. 6 VOUT1 Channel 1 Output Voltage. Copyright © 2012 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS9054-03 February 2012 RT9054 Function Block Diagram EN1 Shutdown and Logic Control 250k VIN - VREF MOS Driver + Error Amplifier VOUT1 Current-Limit and Thermal Protection GND EN2 Shutdown and Logic Control 250k - VREF + Error Amplifier MOS Driver VOUT2 Current-Limit and Thermal Protection GND Copyright © 2012 Richtek Technology Corporation. All rights reserved. DS9054-03 February 2012 is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT9054 Absolute Maximum Ratings z z z z z z z z (Note 1) Supply Input Voltage -----------------------------------------------------------------------------------------------------Other I/O Pin Voltages --------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C WDFN-6L 1.6x1.6 --------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 2) ----------------------------------------------------------------------------WDFN-6L 1.6x1.6, θJA ---------------------------------------------------------------------------------------------------Junction Temperature ----------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------Storage Temperature Range -------------------------------------------------------------------------------------------ESD Susceptibility (Note 3) HBM (Human Body Mode) ---------------------------------------------------------------------------------------------MM (Machine Mode) ------------------------------------------------------------------------------------------------------ Recommended Operating Conditions z z z z −0.3V to 7V −0.3V to 7V 0.571W 175°C/W 150°C 260°C −65°C to 150°C 2kV 200V (Note 4) Supply Input Voltage -----------------------------------------------------------------------------------------------------Enable Input Voltage -----------------------------------------------------------------------------------------------------Junction Temperature Range -------------------------------------------------------------------------------------------Ambient Temperature Range -------------------------------------------------------------------------------------------- 2.5V to 5.5V 0V to 5.5V −40°C to 125°C −40°C to 85°C Electrical Characteristics (VIN = VOUTx + 1V, VENx = VIN, CIN = 1μF, COUT = 4.7μF, TA = 25°C, unless otherwise specified.) Parameter Dropout Voltage (Note 5) Symbol VDROP Test Conditions IOUTx = 300mA Min Typ Max Unit -- 240 330 mV Output Voltage Range VOUTx 1.2 -- 3.6 V VOUT Accuracy ΔVOUTx IOUTx = 1mA to 300mA −3 -- +3 % Line Regulation ΔVLINE -- -- 0.2 %/V Load Regulation ΔVLOAD 1mA < IOUTx < 300mA -- -- 0.6 % Current Limit I LIM RLOAD = 1Ω 330 450 700 mA Quiescent Current IQ VENx > 1.5V -- 58 80 μA Shutdown Current I Q_SD VENx < 0.4V -- -- 1 μA -- 100 -- ppm/°C VIN = (VOUTx + 0.3V) to 5.5V or VIN > 2.5V, whichever is larger Output Voltage TC EN Input Threshold Voltage Logic High VIH VIN = 2.5V to 5.5V, Power On 1.5 -- -- Logic Low VIL VIN = 2.5V to 5.5V, Shutdown -- -- 0.4 150 250 330 kΩ -- 3 -- kΩ EN Input Pull-Low Resistor VOUT Discharge Resistance in Shutdown (Note 6) VIN = 5V, EN1 = EN2 = GND V Thermal Shutdown TSD -- 170 -- °C Thermal Shutdown Hysteresis ΔTSD -- 40 -- °C Copyright © 2012 Richtek Technology Corporation. All rights reserved. www.richtek.com 4 is a registered trademark of Richtek Technology Corporation. DS9054-03 February 2012 RT9054 Parameter PSRR VIN = VOUT + 1V, COUT = 4.7μF I LOAD = 50mA PSRR VIN = VOUT + 1V, COUT = 4.7μF I LOAD = 50mA Output Voltage Noise Symbol PSRR Test Conditions Min Typ Max f = 100Hz -- 70 -- f = 1kHz -- 70 -- f = 10kHz -- 70 -- f = 100kHz -- 54 -- f = 200kHz -- 45 -- f = 300kHz -- 38 -- -- 100 -- COUT1 = COUT2 = 10μF, 10Hz to 100kHz, IOUT1 = IOUT2 = 1mA Unit dB dB μVRMS Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and 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 may affect device reliability. Note 2. θJA is measured at TA = 25°C on a low effective thermal conductivity single-layer test board per JEDEC 51-3. θJC is measured at the exposed pad of the package. Note 3. Devices are ESD sensitive. Handling precaution recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Note 5. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) − 100mV. Note 6. It is guaranteed by design. Copyright © 2012 Richtek Technology Corporation. All rights reserved. DS9054-03 February 2012 is a registered trademark of Richtek Technology Corporation. www.richtek.com 5 RT9054 Typical Operating Characteristics Output Voltage vs. Temperature Output Voltage vs. Temperature 3.4 RT9054-GS, VOUT1 1.85 Output Voltage (V) Output Voltage (V) 1.9 1.8 1.75 RT9054-GS, VOUT2 3.35 3.3 3.25 3.2 1.7 -50 -25 0 25 50 75 100 -50 125 -25 Temperature (°C) 50 75 100 125 Dropout Voltage vs. Load Current 350 RT9054-GS VIN = VENx = 4.3V RT9054-GS, VOUT2 TJ = 125°C 300 Dropout Voltage (mV) Quiescent Current (uA) 25 Temperature (°C) Quiescent Current vs. Temperature 70 0 65 60 55 250 TJ = 25°C 200 150 TJ = -40°C 100 50 50 0 -50 -25 0 25 50 75 100 125 0 100 150 200 250 Load Current (mA) Power On from VIN Line Transient Response RT9054-FM, VEN1 = VEN2 = 1.5V Both ILOAD = 10mA 300 RT9054-GS, Both ILOAD = 1mA VIN = 3.8V to 4.8V VIN 4.8 (V) VIN (5V/Div) 3.8 VOUT2 (10mV/Div) VOUT1 (1V/Div) VOUT1 (10mV/Div) VOUT2 (2V/Div) Time (10μs/Div) Copyright © 2012 Richtek Technology Corporation. All rights reserved. www.richtek.com 6 50 Temperature (°C) Time (100μs/Div) is a registered trademark of Richtek Technology Corporation. DS9054-03 February 2012 RT9054 Line Transient Response Line Transient Response RT9054-GS, Both ILOAD = 10mA VIN = 3.8V to 4.8V RT9054-GS, Both ILOAD = 50mA VIN = 3.8V to 4.8V VIN 4.8 (V) VIN 4.8 (V) VOUT2 (10mV/Div) VOUT2 (10mV/Div) VOUT1 (10mV/Div) VOUT1 (10mV/Div) 3.8 3.8 Time (100μs/Div) Time (100μs/Div) Line Transient Response Load Transient Response RT9054-GS, Both ILOAD = 100mA VIN = 3.8V to 4.8V VIN 4.8 (V) RT9054-GS, ILOAD = 10mA to 50mA VIN = VEN = 4.3V IOUT (50mA/Div) 3.8 VOUT2 (10mV/Div) VOUT1 (20mV/Div) VOUT1 (10mV/Div) VOUT2 (20mV/Div) Time (100μs/Div) Time (250μs/Div) Load Transient Response Power On from EN RT9054-GS, ILOAD = 10mA to 100mA VIN = VEN = 4.3V RT9054-FM, VIN = 5V IOUT1 = IOUT2 = 50mA VEN1 = VEN2 IOUT (100mA/Div) (5V/Div) V OUT2 VOUT1 (20mV/Div) V OUT1 VOUT2 (20mV/Div) (1V/Div) Time (250μs/Div) Copyright © 2012 Richtek Technology Corporation. All rights reserved. DS9054-03 February 2012 Time (5μs/Div) is a registered trademark of Richtek Technology Corporation. www.richtek.com 7 RT9054 PSRR PSRR EN Pin Shutdown Response 20 RT9054-FM, VIN = 5V IOUT1 = IOUT2 = 50mA IOUT = 50mA 0 PSRR(dB) VEN1 = VEN2 (5V/Div) V OUT2 V OUT1 -20 -40 -60 (1V/Div) -80 Time (50μs/Div) 10 100 1000 1k 10000 10k 100000 100k 1000000 1M Frequency(Hz) Noise 150 Noise RT9054-GS, No LOAD VIN = VENx = 4.5V(By battery) 300 200 Noise (μV/Div) Noise (μV/Div) 100 RT9054-GS, ILOAD = 50mA VIN = VENx = 4.5V(By battery) 50 0 -50 100 0 -100 -100 -200 -150 -300 Time (10ms/Div) Time (10ms/Div) EN1 Pin Shutdown Response EN2 Pin Shutdown Response VEN1 VEN2 VEN1 VEN1 (2V/Div) VEN1 VEN2 (2V/Div) VEN2 VEN2 (2V/Div) V OUT2 (2V/Div) V OUT1 V OUT1 (1V/Div) Time (10ms/Div) Copyright © 2012 Richtek Technology Corporation. All rights reserved. www.richtek.com 8 (1V/Div) V OUT2 Time (10ms/Div) is a registered trademark of Richtek Technology Corporation. DS9054-03 February 2012 RT9054 Application Information Like any low-dropout regulator, the external capacitors used with the RT9054 must be carefully selected for regulator stability and performance. Using a capacitor value is >1μF on the RT9054 input, and the amount of capacitance can be increased without limit. The input capacitor must be located at 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 LDO applications. The RT9054 is designed specifically to work with low ESR ceramic output capacitor under space-saving and performance consideration. Using a ceramic capacitor with value at least 4.7μF and ESR is > 20mΩ on the RT9054 output ensures stability. The RT9054 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 RT9054 and returned to a clean analog ground. Region of Stable COUT ESR vs. Load Current Region ESR (Ω) (Ω) OUT ESR RegionofofStable StableCCOUT 100 Thermal Considerations Thermal protection limits power dissipation in RT9054. When the operation junction temperature exceeds 170°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 40°C. The RT9054 lowers its OTP trip level from 170°C to 110°C when output short circuit occurs (VOUT < 0.4V) as shown in Figure 2. It limits the IC case temperature to under 100°C and provides maximum safety to customer while output short circuit occurs. VOUT Short to GND 0.4V VOUT IOUT TSD 170 °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 (Patent) For continuous operation, do not exceed absolute maximum operation junction temperature 125°C. The power dissipation definition in device is : RT9054-FM, COUT = 4.7μF/X7R 10 Unstable Range PD = (VIN-VOUT) x IOUT + VIN x IQ 1 The maximum power dissipation depends on the thermal resistance of the IC package, PCB layout, rate of surrounding airflow and temperature difference between junction to ambient. The maximum power dissipation can be calculated by the following formula : Stable Range 0.1 0.01 Simulation Verify 0.001 0 50 100 150 200 250 Load Current (mA) Figure 1. Stable Cout ESR Range Copyright © 2012 Richtek Technology Corporation. All rights reserved. DS9054-03 February 2012 300 PD(MAX) = (TJ(MAX) − TA) /θJA where T J(MAX) is the maximum operation junction temperature, TA is the ambient temperature and θJA is the junction to ambient thermal resistance. is a registered trademark of Richtek Technology Corporation. www.richtek.com 9 RT9054 PD(MAX) = ( 125°C − 25°C ) / (175°C/W) = 0.571W for WDFN-6L 1.6x1.6 packages The maximum power dissipation depends on the operating ambient temperature for fixed T J(MAX) and thermal resistance θJA. For the IC packages, the Figure 3 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. Copyright © 2012 Richtek Technology Corporation. All rights reserved. www.richtek.com 10 1 Single Layer PCB 0.9 Power Dissipation (W) For recommended operating conditions specification of the IC, the maximum junction temperature is 125°C. The junction to ambient thermal resistance ( θJA is layout dependent ) for WDFN-8L 1.6x1.6 is 175°C/W on the standard JEDEC 51-3 single-layer thermal test board. The maximum power dissipation at TA = 25°C can be calculated by the following formula : 0.8 0.7 0.6 0.5 WDFN-6L 1.6x1.6 0.4 0.3 0.2 0.1 0 0 25 50 75 100 125 Ambient Temperature (°C) Figure 3. Derating Curve of Maximum Power Dissipation is a registered trademark of Richtek Technology Corporation. DS9054-03 February 2012 RT9054 Outline Dimension D2 D L E E2 1 e 2 b A A1 SEE DETAIL A 1 2 1 DETAIL A Pin #1 ID and Tie Bar Mark Options A3 Note : The configuration of the Pin #1 identifier is optional, but must be located within the zone indicated. Dimensions In Millimeters Dimensions In Inches Symbol 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 0.300 0.008 0.012 D 1.550 1.650 0.061 0.065 D2 0.950 1.050 0.037 0.041 E 1.550 1.650 0.061 0.065 E2 0.550 0.650 0.022 0.026 e L 0.500 0.190 0.020 0.290 0.007 0.011 W-Type 6L DFN 1.6x1.6 Package Richtek Technology Corporation 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries. DS9054-03 February 2012 www.richtek.com 11