RT9014/A Ultra Low Noise 300mA Dual LDO Regulator with POR, NMOS Driver and Requiring No Bypass Capacitor General Description Features RT9014/A is a dual channel, low noise, and low dropout with the sourcing ability up to 300mA, an open drain driver and power-on reset function. The open-drain output is capable of sinking 150mA for LED backlighting applications. 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) 1 Open-Drain Driver Ultra-low Quiescent Current 27μ μA/LDO High Output Accuracy 2% Short Circuit Protection Thermal Shutdown Protection Current Limit Protection Short Circuit Thermal Folded Back Protection Tiny 10-Lead WDFN Package RoHS Compliant and 100% Lead (Pb)-Free The range of output voltage is from 1.2V to 3.6V by operating from 2.5V to 5.5V input. z z z z z z The RT9014/A offers 2% 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, output short circuit protection. The RT9014/A 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 (VOUT < 0.4V) providing maximum safety to end users. The RT9014/A can operate stably with very small ceramic output capacitors, reducing required board space and component cost. The RT9014/A is available in fixed output voltages in the WDFN-10L 3x3 package. z z z z z z z z Applications z z z z z Ordering Information RT9014/A- Package Type QW : WDFN-10L 3x3 (W-Type) Lead Plating System P : Pb Free G : Green (Halogen Free and Pb Free) Output Voltage : VOUT1/VOUT2 VOUT2 > VOUT1 is Recommended EN Function Independent EN Function Dependent Note : 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. z CDMA/GSM Cellular Handsets Battery-Powered Equipment Laptop, Palmtops, Notebook Computers Hand-Held Instruments PCMCIA Cards Portable Information Appliances Available Voltage Version Code Voltage Code Voltage Code Voltage A 3.5 B 1.3 C 1.2 D G 1.85 1.8 E H 2.1 2 F J 1.5 2.5 K N 2.6 2.85 L P 2.7 3 M Q 2.8 3.1 R V Y 3.2 2.9 1.9 S W 3.3 1.6 T X 2.65 3.15 Marking Information For marking information, contact our sales representative directly or through a Richtek distributor located in your area. DS9014/A-11 April 2011 www.richtek.com 1 RT9014/A Pin Configurations (TOP VIEW) VOUT1 VOUT2 8 POR 7 DRV GND 1 10 2 9 GND 3 4 11 9 5 VIN EN1 EN2 SW SET VOUT1 VOUT2 8 POR 7 DRV GND 1 10 2 9 3 GND 4 11 5 RT9014 9 VIN EN NC SW SET RT9014A Typical Application Circuit 100K 100K VIN VIN CIN 1uF Chip Enable EN DRV Enable VIN POR DRV RT9014 VOUT1 COUT1 1uF SW 100k VOUT2 SET VIN CIN 1uF COUT2 1uF GND VOUT1 Chip Enable DRV Enable POR EN1 DRV RT9014A EN2 VOUT1 SW VOUT2 100k VOUT2 SET GND CDELAY CDELAY COUT1 1uF COUT2 1uF VOUT1 VOUT2 Functional Pin Description Pin No. RT9014-□□PQW RT9014A-□□ Pin Name Pin Function 1 1 VIN Supply Input. 2 -- EN Chip Enable (Active High). --- 2 3 EN1 EN2 Chip Enable 1 (Active High). Chip Enable 2 (Active High). 3 -- NC No Internal Connection Pin. 4 4 SW Active high signal drives open-drain N-MOSFET. Note that this pin is high impedance. There should be a pull low 100kΩ resistor connected to GND when the control signal is floating. 5 5 SET Delay Set Input: Connect external capacitor to GND to set the internal delay for the POR output. When left open, there is no delay. This pin cannot be grounded. 6 6 GND Common Ground. 7 7 DRV Open-Drain Output: Capable of sinking 150mA. 8 8 POR Power-On Reset Output: Open-drain output. Active low indicates an output under-voltage condition on regulator 2. 9 9 VOUT2 Channel 2 Output Voltage 10 10 VOUT1 Channel 1 Output Voltage 11 (Exposed Pad) 11 (Exposed Pad) GND www.richtek.com 2 The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. DS9014/A-11 April 2011 RT9014/A Function Block Diagram Shutdown and Logic Control VIN - VREF MOS Driver + Error Amplifier VOUT1 Current-Limit and Thermal Protection GND EN Shutdown and Logic Control 0.2uA - VREF MOS Driver + Error Amplifier Current-Limit and Thermal Protection VOUT2 GND SET POR& Delay POR DRV SW SW Logic RT9014 To be continued DS9014/A-11 April 2011 www.richtek.com 3 RT9014/A EN1 Shutdown and Logic Control 0.2uA VIN - VREF MOS Driver + Error Amplifier VOUT1 Current-Limit and Thermal Protection GND EN2 Shutdown and Logic Control 0.2uA - VREF MOS Driver + Error Amplifier Current-Limit and Thermal Protection VOUT2 GND SET POR& Delay POR DRV SW SW Logic RT9014A www.richtek.com 4 DS9014/A-11 April 2011 RT9014/A 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-10L 3x3 ------------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 2) WDFN-10L 3x3, 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 6V 6V 0.926W 108°C/W 150°C 260°C −65°C to 150°C 2kV 200V (Note 4) Supply Input Voltage ------------------------------------------------------------------------------------------------------ 2.5V to 5.5V Enable Input Voltage ------------------------------------------------------------------------------------------------------ 0V to 5.5V Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C Electrical Characteristics (VIN = VOUT + 1V, VEN = VIN, CIN = COUT = 1μF, TA = 25°C, unless otherwise specified.) Parameter Input Voltage Dropout Voltage Symbol VIN (Note 5) VDROP Test Conditions Min Typ Max Unit 2.5 -- 5.5 V IOUT = 150mA -- 120 -- mV IOUT = 300mA -- 240 -- mV 1.2 -- 3.6 V VIN = 2.5V to 5.5V Output voltage range VOUT V OUT Accuracy ΔV IOUT = 1mA -2 -- +2 % Line Regulation ΔVLINE VIN = (V OUT + 0.3V) to 5.5V or VIN > 2.5V, whichever is larger -- -- 0.2 %/V Load Regulation ΔVLOAD 1mA < IOUT< 300mA -- -- 0.6 % RLOAD = 1Ω 330 450 700 mA Current Limit Quiescent Current IQ VEN > 1.5V -- 58 80 uA Shutdown Current IQ_SD VEN < 0.4V -- -- 1 uA VIH VIN = 2.5V to 5.5V, Power On 1.5 -- -- VIL VIN = 2.5V to 5.5V, Shutdown -- -- 0.4 -- 100 -- ppm/°C EN Threshold Output Voltage TC V Thermal Shutdown T SD -- 170 -- °C Thermal Shutdown Hysteresis ΔTSD -- 40 -- °C To be continued DS9014/A-11 April 2011 www.richtek.com 5 RT9014/A Parameter Min Typ Max Unit f =100Hz -- 65 -- dB f =1kHz -- 60 -- dB f =10kHz -- 50 -- dB f =100Hz -- 65 -- dB f =1kHz -- 50 -- dB f =10kHz -- 50 -- dB VTHL Low Threshold, % of nominal VOUT2 (Flag On) 85 90 93 % VTHH High Threshold, % of nominal VOUT2 (Flag Off) 92 95 98 % POR Output Logic Low Voltage VOL ILOW = 250uA -- 0.02 0.1 V POR Leakage Current IPOR Flag Off -1 0.01 1 μA Set pin current source VSET = 0 0.60 1.25 1.70 μA Set pin threshold POR = high -- 1.4 -- V Voltage Low IDRV = 150mA -- 0.2 0.5 V Leakage current IDRV = 0mA, VDRV = 5V, SW = 0V -1 0.01 1 μA VIL < 0.6V(DRV Shutdown) -1 0.01 1 μA VIH > 2.5V(DRV Enable) -1 0.01 1 μA VIL Logic Low -- -- 0.4 V VIH Logic High 1.5 -- -- V PSRR ILOAD = 10mA PSRR ILOAD = 150mA Symbol PSRR PSRR Test Conditions Power Good Reset Threshold DRV output SW input current SW input voltage 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 T A = 25°C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard. 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. www.richtek.com 6 DS9014/A-11 April 2011 RT9014/A Typical Operating Characteristics Output Voltage vs. Temperature Output Voltage vs. Temperature 3.4 RT9014/A-GS, VOUT1 1.85 Output Voltage (V) Output Voltage (V) 1.9 1.8 1.75 RT9014-GS, VOUT2 3.35 3.3 3.25 3.2 1.7 -50 -25 0 25 50 75 100 -50 125 -25 0 RT9014/A-GS VIN = VEN = VSW = 4.3V CIN = COUT1 = COUT2 = 1uF/X7R 100 125 RT9014/A-GS, VOUT2 TJ = 125°C 300 Dropout Voltage (mV) Quiescent Current (uA) 350 60 55 250 TJ = 25°C 200 150 TJ = -40°C 100 50 50 0 -50 -25 0 25 50 75 100 0 125 50 Temperature (°C) 0 PSRR 10000 RT9014-FM, VOUT1 VIN = 4.3V ± 0.1V CIN = COUT1 = COUT2 = 1uF/X7R ILOAD = 100mA ILOAD = 50mA -20 -40 ILOAD = 10mA -60 -80 0.01 10 0.1 100 1 1000 10k 10000 Frequency (Hz) (Hz) DS9014/A-11 April 2011 100 150 200 250 300 Load Current (mA) 100k 100000 1000k 1000000 POR Delay Time (ms) 20 PSRR (dB) 75 Dropout Voltage vs. Load Current Quiescent Current vs. Temperature 65 50 Temperature (°C) Temperature (°C) 70 25 POR Delay RT9014/A-FM 1000 100 10 1 0.1 0.01 0.0001 0.0010 0.0100 0.1000 1.0000 POR Setting Capacitance (uF) www.richtek.com 7 RT9014/A Line Transient Response Line Transient Response RT9014/A-GS, Both ILOAD = 10mA VIN = 3.8V to 4.8V RT9014/A-GS, Both ILOAD = 1mA 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 Line Transient Response RT9014/A-GS, Both ILOAD = 50mA VIN = 3.8V to 4.8V RT9014/A-GS, Both ILOAD = 100mA 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) Load Transient Response Load Transient Response RT9014/A-GS, ILOAD = 10mA to 100mA VIN = VEN = 4.3V CIN = COUT1 = COUT2 = 1uF/X7R RT9014/A-GS, ILOAD = 10mA to 50mA VIN = VEN = 4.3V CIN = COUT1 = COUT2 = 1uF/X7R IOUT (50mA/Div) IOUT (100mA/Div) VOUT1 (20mV/Div) VOUT1 (20mV/Div) VOUT2 (20mV/Div) VOUT2 (20mV/Div) Time (250μs/Div) www.richtek.com 8 Time (250μs/Div) DS9014/A-11 April 2011 RT9014/A Start Up EN Pin Shutdown Response RT9014/A-FM, VIN = VSW = 5V IOUT1 = IOUT2 = 50mA RT9014/A-FM, VIN = VSW = 5V IOUT1 = IOUT2 = 50mA (5V/Div) V EN (5V/Div) V EN V OUT2 V OUT2 V OUT1 V OUT1 (1V/Div) (1V/Div) Time (5μs/Div) Time (50μs/Div) Power-On Noise RT9014/A-FM Both ILOAD = 10mA RT9014/A-GS, No LOAD VIN = VEN = VSW = 4.5V(By battery) 150 CIN = COUT1 = COUT2 = 1uF/X7R 100 Noise (μV/Div) VEN (5V/Div) VOUT1 (1V/Div) VOUT2 (2V/Div) POR (5V/Div) 50 0 -50 -100 -150 Time (10μs/Div) Time (10ms/Div) Noise 300 RT9014/A-GS, ILOAD = 50mA VIN = VEN = VSW = 4.5V(By battery) CIN = COUT1 = COUT2 = 1uF/X7R Noise (μV/Div) 200 100 0 -100 -200 -300 Time (10ms/Div) DS9014/A-11 April 2011 www.richtek.com 9 RT9014/A Applications Information Like any low-dropout regulator, the external capacitors used with the RT9014/A must be carefully selected for regulator stability and performance. Using a capacitor whose value is > 1μF on the RT9014/A 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. The output capacitor must meet both requirements for minimum amount of capacitance and ESR in all LDOs application. The RT9014/A 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 RT9014/A output ensures stability. The RT9014/A 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 RT9014/A and returned to a clean analog ground. Region of Stable COUT ESR vs. Load Current Region ESR (Ω) (Ω) OUT ESR RegionofofStable StableCCOUT 100 RT9014-FM, VIN = 5V CIN = COUT1 = COUT2 = 1uF/X7R 10 Unstable Range 1 Thermal Considerations Thermal protection limits power dissipation in RT9014/A. 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 turn on again after the junction temperature cools by 40°C. RT9014/A 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 IC case temperature under 100°C and provides maximum safety to customer while output short circuit occurring. 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 : PD = (VIN − VOUT) x IOUT + VIN x IQ Stable Range 0.1 0.01 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 : Simulation Verify 0.001 0 50 100 150 200 Load Current (mA) Figure 1. Stable Cout ESR Range www.richtek.com 10 250 300 PD(MAX) = ( TJ(MAX) − TA ) /θJA Where T J(MAX) is the maximum operation junction temperature, TA is the ambient temperature and the θJA is the junction to ambient thermal resistance. DS9014/A-11 April 2011 RT9014/A For recommended operating conditions specification of RT9014/A, the maximum junction temperature is 125°C. The junction to ambient thermal resistance (θJA is layout dependent) for WDFN-10L 3x3 package is 108°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 following formula : P D(MAX) = ( 125°C − 25°C ) / 108 = 0.926W for WDFN-10L 3x3 packages The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance θJA . For RT9014/A packages, the Figure 3 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. 1 Power Dissipation (W) 0.9 0.8 0.7 WDFN-10L 3x3 0.6 0.5 0.4 0.3 0.2 0.1 0 0 25 50 75 100 125 Ambient Temperature (°C) Figure 3. Derating Curves for RT9014/A Packages DS9014/A-11 April 2011 www.richtek.com 11 RT9014/A Outline Dimension D2 D L E E2 1 e SEE DETAIL A b 2 1 2 1 A A1 A3 DETAIL A Pin #1 ID and Tie Bar Mark Options 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 0.180 0.300 0.007 0.012 D 2.950 3.050 0.116 0.120 D2 2.300 2.650 0.091 0.104 E 2.950 3.050 0.116 0.120 E2 1.500 1.750 0.059 0.069 e L 0.500 0.350 0.020 0.450 0.014 0.018 W-Type 10L DFN 3x3 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. www.richtek.com 12 DS9014/A-11 April 2011