RT9012-MGGQW

Preliminary RT9012 300mA Dual LDO Regulator with POR General Description RT9012 is a dual channel, low noise, and low dropout with the sourcing ability up to 300mA and power-on reset function. The range of output voltage is from 1.2V to 3.6V by operating from 2.5V to 5.5V input. RT9012 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. RT9012 is short circuit thermal folded back protected. RT9012 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. RT9012 can operate stably with very small ceramic output capacitors, reducing required board space and component cost. RT9012 is available in fixed output voltages in the WDFN-8L 2x2 package. Features Wide Operating Voltage Ranges : 2.5V 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 27μA/LDO High Output Accuracy 2% Short Circuit Protection Thermal Shutdown Protection Current Limit Protection Short Circuit Thermal Folded Back Protection Tiny 8-Lead WDFN Package RoHS Compliant and 100% Lead (Pb)-Free Applications CDMA/GSM Cellular Handsets Battery-Powered Equipment Laptop, Palmtops, Notebook Computers Hand-Held Instruments PCMCIA Cards Portable Information Appliances Ordering Information RT9012Package Type QW : WDFN-8L 2x2 (W-Type) Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Output Voltage : VOUT1/VOUT2 CM : 1.20V/2.80V, FM : 1.50V/2.80V FS : 1.50V/3.30V, GK : 1.80V/2.60V GM : 1.80V/2.80V, GP : 1.80V/3.00V GS : 1.80V/3.30V, JG : 2.50V/1.80V JM : 2.50V/2.80V, JP : 2.50V/3.00V JS : 2.50V/3.30V, JN : 2.50V/2.85V MG : 2.80V/1.80V, MM : 2.80V/2.80V NN : 2.85V/2.85V, PP : 3.00V/3.00V 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. DS9012-06 August 2007 Pin Configurations (TOP VIEW) VIN 1 EN1 2 EN2 3 SET 4 8 9 7 6 5 VOUT1 VOUT2 POR GND WDFN-8L 2x2 Marking Information For marking information, contact our sales representative directly or through a Richtek distributor located in your area, otherwise visit our website for detail. www.richtek.com 1 RT9012 Typical Application Circuit Preliminary 100K VIN VIN CIN 1uF Chip Enable EN1 EN2 SET GND CDELAY RT9012 POR VOUT1 COUT1 1uF COUT2 1uF VOUT1 VOUT2 VOUT2 Functional Pin Description Pin No. 1 2 3 4 5 6 7 8 Exposed Pad (9) Pin Name VIN EN1 EN2 SET GND POR VOUT2 VOUT1 GND Supply Input. Chip Enable1 (Active High). Chip Enable2 (Active High). Delay Set Input. Connect external capacitor to GND to set the internal delay. Common Ground. Power-On Reset Output : Open-drain output. Active low indicates an output under-voltage condition on regulator 2. Channel 2 Output Voltage. Channel 1 Output Voltage. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. Pin Function Available Voltage Version Code Voltage Code Voltage C 1.2 L 2.7 F 1.5 M 2.8 W 1.6 N 2.85 G 1.8 V 2.9 D 1.85 P 3 Y 1.9 Q 3.1 H 2 R 3.2 E 2.1 S 3.3 J 2.5 --K 2.6 --T 2.65 --- www.richtek.com 2 DS9012-06 August 2007 Preliminary Function Block Diagram EN1 0.2uA Shutdown and Logic Control VIN RT9012 VREF - + MOS Driver VOUT1 Current-Limit and Thermal Protection GND Error Amplifier EN2 0.2uA Shutdown and Logic Control VREF - + MOS Driver VOUT2 Current-Limit and Thermal Protection GND Error Amplifier SET POR& Delay POR DS9012-06 August 2007 www.richtek.com 3 RT9012 Absolute Maximum Ratings Preliminary (Note 1) 6V 6V 0.606W 165°C/W 260°C −65°C to 150°C 2kV 200V Supply Input Voltage -----------------------------------------------------------------------------------------------------Other I/O Pin Voltages --------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C WDFN-8L 2x2 -------------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 4) WDFN-8L 2x2, θJA --------------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------Storage Temperature Range -------------------------------------------------------------------------------------------ESD Susceptibility (Note 2) HBM (Human Body Mode) ---------------------------------------------------------------------------------------------MM (Machine Mode) ------------------------------------------------------------------------------------------------------ Recommended Operating Conditions (Note 3) Supply Input Voltage ------------------------------------------------------------------------------------------------------ 2.5V to 5.5V Enable Input Voltage ------------------------------------------------------------------------------------------------------ 0V to 5.5V Operation Junction Temperature Range ------------------------------------------------------------------------------ −40°C to 125°C Operation Ambient Temperature Range ------------------------------------------------------------------------------ 0°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 (Note 5) Symbol VIN VDROP VOUT ΔV ΔVLINE Test Conditions VIN = 2.5V to 5.5V IOUT = 150mA IOUT = 300mA Min 2.5 --1.2 Typ -120 240 ----450 58 ---100 170 40 Max 5.5 --3.6 +2 0.2 0.6 700 80 1 -0.4 ---- Units V mV mV V % %/V % mA μA μA V ppm/°C °C °C Output voltage range VOUT Accuracy Line Regulation Load Regulation Current Limit Quiescent Current Shutdown Current EN Threshold Output Voltage TC Thermal Shutdown Thermal Shutdown Hysteresis IOUT = 1mA VIN = (VOUT + 0.3V) to 5.5V or VIN > 2.5V, whichever is larger -2 --330 --1.5 ----- ΔVLOAD 1mA < IOUT< 300mA RLOAD = 1Ω IQ IQ_SD VIH VIL TSD ΔTSD VEN > 1.5V VEN < 0.4V VIN = 2.5V to 5.5V, Power On VIN = 2.5V to 5.5V, Shutdown To be continued www.richtek.com 4 DS9012-06 August 2007 Preliminary Parameter PSRR ILOAD = 10mA Symbol PSRR Test Conditions f =100Hz f =1kHz f =10kHz PSRR ILOAD = 150mA Power Good VTHL Reset Threshold VTHH POR Output Logic Low Voltage POR Leakage Current Set pin Current Source Set pin Threshold VOL IPOR Low Threshold, % of nominal VOUT2 (Flag On) High Threshold, % of nominal VOUT2 (Flag Off) ILOW = 250uA Flag Off VSET = 0 POR = high 90 ---1 0.60 ---0.02 0.01 1.25 1.4 f =100Hz PSRR f =1kHz f =10kHz Min ------Typ 65 60 50 65 50 50 RT9012 Max ------Units dB dB dB dB dB dB -96 0.1 1 1.70 -- % % V μA μA V 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 i s 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 5. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) − 100mV. DS9012-06 August 2007 www.richtek.com 5 RT9012 Preliminary Typical Operating Characteristics Output Voltage vs. Temperature 1.9 Output Voltage vs. Temperature 3.4 RT9012-GS, VOUT1 RT9012-GS, VOUT2 Output Voltage (V) Output Voltage (V) 1.85 3.35 1.8 3.3 1.75 3.25 1.7 -50 -25 0 25 50 75 100 125 3.2 -50 -25 0 25 50 75 100 125 Temperature (°C) Temperature (°C) Quiescent Current vs. Temperature 70 Dropout Voltage vs. Load Current 350 300 Quiescent Current (uA) 65 Dropout Voltage (mV) RT9012-GS VIN = VEN = 4.3V CIN = COUT1 = COUT2 = 1uF/X7R RT9012-GS, VOUT2 TJ = 125°C TJ = 25°C 250 200 150 100 50 60 TJ = -40°C 55 50 -50 -25 0 25 50 75 100 125 0 0 50 100 150 200 250 300 Temperature (°C) Load Current (mA) 20 PSRR RT9011-FM, VOUT1 VIN = 4.3V ± 0.1V CIN = COUT1 = COUT2 = 1uF/X7R 10000 1000 100 10 1 0.1 POR Delay RT9012-FM 0 ILOAD = 100mA ILOAD = 50mA PSRR (dB) -20 -40 ILOAD = 10mA -60 POR Delay Time (ms) -80 0.01 10 0.1 100 1 1000 10k 10000 100k 100000 1000k 1000000 0.01 0.0001 0.0010 0.0100 0.1000 1.0000 Frequency (Hz) (Hz) POR Setting Capacitance (uF) www.richtek.com 6 DS9012-06 August 2007 Preliminary RT9012 Line Transient Response RT9012-GS, Both ILOAD = 10mA VIN = 3.8V to 4.8V Line Transient Response RT9012-GS, Both ILOAD = 1mA VIN = 3.8V to 4.8V VIN 4.8 (V) 3.8 VIN 4.8 (V) 3.8 VOUT2 (10mV/Div) VOUT1 (10mV/Div) VOUT2 (10mV/Div) VOUT1 (10mV/Div) Time (100μs/Div) Time (100μs/Div) Line Transient Response RT9012-GS, Both ILOAD = 50mA VIN = 3.8V to 4.8V Line Transient Response RT9012-GS, Both ILOAD = 100mA VIN = 3.8V to 4.8V VIN 4.8 (V) 3.8 VIN 4.8 (V) 3.8 VOUT2 (10mV/Div) VOUT1 (10mV/Div) VOUT2 (10mV/Div) VOUT1 (10mV/Div) Time (100μs/Div) Time (100μs/Div) Load Transient Response RT9012-GS, ILOAD = 10mA to 50mA VIN = VEN = 4.3V CIN = COUT1 = COUT2 = 1uF/X7R Load Transient Response RT9012-GS, ILOAD = 10mA to 100mA VIN = VEN = 4.3V CIN = COUT1 = COUT2 = 1uF/X7R IOUT (50mA/Div) VOUT1 (20mV/Div) VOUT2 (20mV/Div) Time (250μs/Div) IOUT (100mA/Div) VOUT1 (20mV/Div) VOUT2 (20mV/Div) Time (250μs/Div) DS9012-06 August 2007 www.richtek.com 7 RT9012 Start Up RT9012-FM, VIN = 5V IOUT1 = IOUT2 = 50mA Preliminary EN Pin Shutdown Response RT9012-FM, VIN = 5V IOUT1 = IOUT2 = 50mA (5V/Div) V EN V OUT2 (5V/Div) V EN V OUT2 V OUT1 V OUT1 (1V/Div) Time (5μs/Div) (1V/Div) Time (50μs/Div) Power-On RT9012-FM Both ILOAD = 10mA Noise RT9012-GS, No LOAD VIN = VEN = 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) Time (10μs/Div) 50 0 -50 -100 -150 Time (10ms/Div) Noise 300 200 RT9012-GS, ILOAD = 50mA VIN = VEN = 4.5V(By battery) CIN = COUT1 = COUT2 = 1uF/X7R Noise (μV/Div) 100 0 -100 -200 -300 Time (10ms/Div) www.richtek.com 8 DS9012-06 August 2007 Preliminary Applications Information Like any low-dropout regulator, the external capacitors used with the RT9012 must be carefully selected for regulator stability and performance. Using a capacitor whose value is > 1 μ F on the RT9012 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 RT9012 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 RT9012 output ensures stability. The RT9012 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 RT9012 and returned to a clean analog ground. Thermal Considerations RT9012 Thermal protection limits power dissipation in RT9012. 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. RT9012 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 Region of Stable COUT ESR vs. Load Current 100 Region of Stable C OUT ESR ((Ω)) Region of Stable C OUT ESR Ω 10 RT9012-FM, VIN = 5V CIN = COUT1 = COUT2 = 1uF/X7R Unstable Range 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 1 0.1 Stable Range 0.01 Simulation Verify 0.001 0 50 100 150 200 250 300 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 : PD(MAX) = ( TJ(MAX) − TA ) /θJA Where T J(MAX) i s the maximum operation junction temperature 125°C, TA is the ambient temperature and the θJA is the junction to ambient thermal resistance. www.richtek.com 9 Load Current (mA) Figure 1. Stable Cout ESR Range DS9012-06 August 2007 RT9012 Preliminary For recommended operating conditions specification of RT9012, where T J(MAX) i s the maximum junction temperature of the die (125°C) and TA is the operated ambient temperature. The junction to ambient thermal resistance (θJA is layout dependent) for WDFN-8L 2x2 package is 108°C/W on the standard JEDEC 51-3 singlelayer thermal test board. The maximum power dissipation at TA = 25°C can be calculated by following formula : P D(MAX) = ( 1 25 ° C − 2 5 ° C ) / 108 = 0.926W for WDFN-8L 2x2 packages The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance θJA . For RT9012 packages, the Figure 3 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. Power Dissipation vs. Ambient Temperature 0.8 0.7 Power Dissipation (W) 0.6 0.5 0.4 0.3 0.2 0.1 0 0 25 WDFN-8L 2x2 50 75 100 125 Ambient Temperature (°C) Figure 3. Derating Curves for RT9012 Packages www.richtek.com 10 DS9012-06 August 2007 Preliminary Outline Dimension D2 RT9012 D L E E2 SEE DETAIL A 1 e A A1 A3 b 2 1 2 1 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. Symbol A A1 A3 b D D2 E E2 e L Dimensions In Millimeters Min 0.700 0.000 0.175 0.200 1.950 1.000 1.950 0.400 0.500 0.300 0.400 Max 0.800 0.050 0.250 0.300 2.050 1.250 2.050 0.650 Dimensions In Inches Min 0.028 0.000 0.007 0.008 0.077 0.039 0.077 0.016 0.020 0.012 0.016 Max 0.031 0.002 0.010 0.012 0.081 0.049 0.081 0.026 W-Type 8L DFN 2x2 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 DS9012-06 August 2007 www.richtek.com 11