RT9055-CCWSC

® RT9055 300mA Dual LDO Regulator General Description Features The RT9055 is a dual channel, low noise, and low dropout regulator sourcing up to 300mA at each channel. The output voltage range is from 0.9V to 3.5V with an input voltage range from 1.5V to 5.5V.  Wide Operating Voltage Range : 1.5V to 5.5V  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 : 29μ μA/LDO High Output Accuracy 2% Short Current Protection Thermal Shutdown Protection Current Limit Protection Short Circuit Thermal Folded Back Protection RoHS Compliant and Halogen Free The RT9055 offers 2% accuracy, extremely low dropout voltage and extremely low quiescent current (only 29μA per LDO). The shutdown current is near zero which is suitable for battery powered applications. The RT9055 also provides protection functions such as current limiting, output short circuit protection, and over temperature protection.           The RT9055 allows stable operation with very small ceramic output capacitors, hence minimizing required board space and component cost. The RT9055 is available in a WL-CSP-6B 0.8x1.2 package.   Applications  Ordering Information  RT9055-  Cellular Handsets Battery Powered Equipment Hand-Held Instruments Portable Information Appliances Package Type WSC : WL-CSP-6B 0.8x1.2  Output Voltage : VOUT1/VOUT2 VOUT2 > VOUT1 is Recommended Pin Configurations (TOP VIEW) Note : EN1 A1 Richtek products are :   RoHS compliant and compatible with the current require- GND B1 ments of IPC/JEDEC J-STD-020. EN2 C1 Suitable for use in SnPb or Pb-free soldering processes. Marking Information For marking information, contact our sales representative directly or through a Richtek distributor located in your area. Copyright © 2014 Richtek Technology Corporation. All rights reserved. DS9055-02 August 2014 A2 VOUT1 B2 VIN C2 VOUT2 WSC-CSP-6B 0.8x1.2 Available Voltage Version Code A D G K N R V Y 2 Voltage Code Voltage 3.5 1.85 1.8 2.6 2.85 3.2 2.9 1.9 1.1 B E H L P S W U 3 1.3 2.1 2 2.7 3 3.3 1.6 1.4 1 Code Voltage C F J M Q T X Z 1.2 1.5 2.5 2.8 3.1 2.65 3.15 1.25 is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT9055 Typical Application Circuit B2 VIN CIN 1µF A1 Chip Enable C1 VOUT1 VIN A2 COUT1 1µF RT9055 EN1 VOUT2 C2 COUT2 1µF EN2 VOUT1 VOUT2 GND B1 Functional Pin Description Pin No. Pin Name Pin Function A1 EN1 LDO1 Enable (Active High). A2 VOUT1 LDO1 Output Voltage. B1 GND Ground. B2 VIN Supply Input. C1 EN2 LDO2 Enable (Active High). C2 VOUT2 LDO2 Output Voltage. Function Block Diagram EN1 Shutdown and Logic Control 13µA Output Driver - VREF VIN + VOUT1 Current Limit and Thermal Protection EN2 Shutdown and Logic Control 13µA - VREF + Output Driver VOUT2 GND Copyright © 2014 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 Current Limit and Thermal Protection is a registered trademark of Richtek Technology Corporation. DS9055-02 August 2014 RT9055 Absolute Maximum Ratings         (Note 1) Supply Input Voltage, VIN ----------------------------------------------------------------------------------------------Other I/O Pins Voltages ------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C WL-CSP-6B 0.8x1.2 -----------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 2) WL-CSP-6B 0.8x1.2, θJA -----------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------Junction Temperature ----------------------------------------------------------------------------------------------------Storage Temperature Range -------------------------------------------------------------------------------------------ESD Susceptibility (Note 3) HBM (Human Body Model) ---------------------------------------------------------------------------------------------MM (Machine Model) ----------------------------------------------------------------------------------------------------- Recommended Operating Conditions    −0.3V to 6V −0.3V to 6V 0.670W 148°C/W 260°C 150°C −65°C to 150°C 2kV 200V (Note 4) Supply Input Voltage, VIN ----------------------------------------------------------------------------------------------- 1.5V 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, TA = −40°C to 85°C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit VOUT = 1.2V to 1.4V, IOUT = 300mA 50 -- 550 VOUT = 1.5V to 2.4V, IOUT = 300mA 40 -- 400 VOUT = 2.5V to 3.5V, IOUT = 300mA 20 -- 300 0.9 -- 3.5 V Input Power Supply Dropout Voltage (Note 5) VDROP mV Output Voltage Range VOUT VOUT Accuracy V IOUT = 1mA to 300mA 2 -- 2 % Line Regulation VLINE VIN = (VOUT + 1) to 5.5V, IOUT = 1mA 2 -- 2 % Load Regulation VLOAD 1mA < IOUT < 300mA 1.5 -- 1.5 % Current Limit ILIM RLOAD = 0 350 600 -- mA Quiescent Current IQ VEN > 1.5V -- 58 -- A Shutdown Current ISHDN VEN < 0.4V -- -- 1 A EN Input Logic-High Threshold Logic-Low Voltage VOUT Discharge Resistance in Shutdown (Note 6) VIH VIN = 2.5V to 5.5V, Power On 1.2 -- -- VIL VIN = 2.5V to 5.5V, Shutdown -- -- 0.4 VIN = 5V, EN1 = EN2 = GND -- 3 -- k EN Pull Low Current IEN 8 13 18 A Thermal Shutdown TSD -- 170 -- °C Thermal Shutdown Hysteresis TSD -- 40 -- °C Copyright © 2014 Richtek Technology Corporation. All rights reserved. DS9055-02 August 2014 V is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT9055 Parameter Symbol Test Conditions Min Typ Max -- 70 -- -- 70 -- -- 70 -- f = 100kHz, VIN =VOUT + 1V, COUT = 2.2F, ILOAD = 50mA -- 54 -- f = 200kHz, VIN = VOUT + 1V, COUT = 2.2F, ILOAD = 50mA -- 45 -- f = 300kHz, VIN = VOUT + 1V, COUT = 2.2F, ILOAD = 50mA -- 38 -- COUT1 = COUT2 = 10F, 10Hz to100kHz, IOUT1 = IOUT2 = 1mA -- 100 -- f = 100Hz, VIN = VOUT + 1V, COUT = 2.2F, ILOAD = 50mA Power Supply Rejection Ratio PSRR Output Voltage Noise f = 1kHz, VIN = VOUT + 1V, COUT = 2.2F, ILOAD = 50mA f = 10kHz, VIN = VOUT + 1V, COUT = 2.2F, ILOAD = 50mA Unit dB VRMS 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 high effective thermal conductivity four-layer test board per JEDEC 51-7. The CSP balls connect directly to the internal GND copper plane by 2 vias, the via diameter is about 1mm. Note 3. Devices are ESD sensitive. Handling precaution is 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 © 2014 Richtek Technology Corporation. All rights reserved. www.richtek.com 4 is a registered trademark of Richtek Technology Corporation. DS9055-02 August 2014 RT9055 Typical Operating Characteristics Output Voltage vs. Temperature Quiescent Current vs. Temperature 1.22 80 1.21 70 Quiescent Current (µA) Output Voltage (V) 1.20 1.19 1.18 1.17 1.16 1.15 1.14 1.13 VIN = 3.7V, No Load 1.12 60 50 40 30 20 10 VIN = 3.7V, No Load 0 -50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 Temperature (°C) Temperature (°C) Dropout Voltage vs. Load Current Line Transient Response 125 140 Dropout Voltage (mV) 120 125°C 100 25°C VIN (2V/Div) 80 −40°C 60 VOUT (20mV/Div) 40 20 VOUT = 3.3V VIN = 2.8V to 4.2V, ILOAD = 1mA 0 0 50 100 150 200 250 Time (100μs/Div) 300 Load Current (mA) Line Transient Response Line Transient Response VIN (2V/Div) VIN (2V/Div) VOUT (20mV/Div) VOUT (20mV/Div) VIN = 2.8V to 4.2V, ILOAD = 10mA Time (100μs/Div) Copyright © 2014 Richtek Technology Corporation. All rights reserved. DS9055-02 August 2014 VIN = 2.8V to 4.2V, ILOAD = 100mA Time (100μs/Div) is a registered trademark of Richtek Technology Corporation. www.richtek.com 5 RT9055 Load Transient Response Line Transient Response VOUT1 (50mV/Div) VIN (2V/Div) IOUT (100mA/Div) VOUT (20mV/Div) VIN = 2.8V to 4.2V, ILOAD = 300mA VIN = 1.8V, ILOAD = 1mA to 100mA Time (100μs/Div) Time (250μs/Div) Load Transient Response Power On from EN VOUT1 (50mV/Div) VEN (1V/Div) VOUT1 (1V/Div) IOUT (100mA/Div) VOUT2 (1V/Div) VIN = 1.8V, ILOAD = 1mA to 300mA VIN = 3.6V, VEN = 2V VOUT1 = VOUT2 = 1.2V, IOUT1 = IOUT2 = 100mA Time (250μs/Div) Time (50μs/Div) Power Off from EN VOUT1 Noise VEN (1V/Div) VOUT (100μV/Div) VOUT1 (1V/Div) VOUT2 (1V/Div) VIN = 3.6V, VEN = 2V VOUT1 = VOUT2 = 1.2V, IOUT1 = IOUT2 = 100mA Time (50μs/Div) Copyright © 2014 Richtek Technology Corporation. All rights reserved. www.richtek.com 6 VIN = VEN = 4.5V, ILOAD = 1mA Time (5ms/Div) is a registered trademark of Richtek Technology Corporation. DS9055-02 August 2014 RT9055 PSRR VOUT2 Noise 0 -10 PSRR (dB) -20 VOUT (100μV/Div) -30 -40 -50 -60 VOUT = 1.2V VIN = VEN = 4.5V, ILOAD = 1mA -70 Time (5ms/Div) 10 10 100 100 1K 1000 10K 10000 100K 100000 1M 1000000 (Hz) Frequency (Hz) Copyright © 2014 Richtek Technology Corporation. All rights reserved. DS9055-02 August 2014 is a registered trademark of Richtek Technology Corporation. www.richtek.com 7 RT9055 Applications Information The output capacitor must meet both requirements for minimum amount of capacitance and ESR in all LDOs application. The RT9055 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 > 20mΩ on the RT9055 output ensures stability. The RT9055 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 RT9055 and returned to a clean analog ground. Region of Stable COUT ESR vs. Load Current Region of of Stable StableCCOUT ESR(Ω) (Ω) Region OUTESR 100 VIN = 5V, CIN = COUT1 =COUT2 =1μF/X7R 10 Unstable Region 1 Stable Region 0.1 0.01 Simulation Verify Thermal Considerations For continuous operation, do not exceed absolute maximum junction temperature. The maximum power dissipation depends on the thermal resistance of the IC package, PCB layout, rate of surrounding airflow, and difference between junction and ambient temperature. The maximum power dissipation can be calculated by the following formula : PD(MAX) = (TJ(MAX) − TA) / θJA where TJ(MAX) is the maximum junction temperature, TA is the ambient temperature, and θJA is the junction to ambient thermal resistance. For recommended operating condition specifications, the maximum junction temperature is 125°C. For WL-CSP6B 0.8x1.2 package, the thermal resistance, θJA, is 148°C/ W on a standard JEDEC 51-7 four-layer thermal test board. The maximum power dissipation at TA = 25°C can be calculated by the following formula : P D(MAX) = (125°C − 25°C) / (148°C/W) = 0.670W for WL-CSP-6B 0.8x1.2 package The maximum power dissipation depends on the operating ambient temperature for fixed T J (MAX) and thermal resistance, θJA. The derating curves in Figure 2 allow the designer to see the effect of rising ambient temperature on the maximum power dissipation. Maximum Power Dissipation (W)1 Like any low-dropout regulator, the external capacitors used with the RT9055 must be carefully selected for regulator stability and performance. Using a capacitor whose value is >1μF on the RT9055 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. 0.8 Four-Layer PCB 0.6 0.4 0.2 0.0 0 0.001 0 50 100 150 200 250 Load Current (mA) 300 25 50 75 100 125 Ambient Temperature (°C) Figure 2. Derating Curve of Maximum Power Dissipation Figure 1. Stable COUT ESR Range Copyright © 2014 Richtek Technology Corporation. All rights reserved. www.richtek.com 8 is a registered trademark of Richtek Technology Corporation. DS9055-02 August 2014 RT9055 Outline Dimension Symbol Dimensions In Millimeters Dimensions In Inches Min. Max. Min. Max. A 0.500 0.600 0.020 0.024 A1 0.170 0.230 0.007 0.009 b 0.240 0.300 0.009 0.012 D 1.150 1.250 0.045 0.049 D1 E 0.800 0.750 0.031 0.850 0.030 0.033 E1 0.400 0.016 e 0.400 0.016 6B WL-CSP 0.8x1.2 Package (BSC) Richtek Technology Corporation 14F, No. 8, Tai Yuen 1st 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. DS9055-02 August 2014 www.richtek.com 9