LESHAN RADIO COMPANY, LTD. 300mA Ultra-low Noise, Ultra-Fast CMOS LDO Regulator FEATURES LR9193 Ultra-low Noise for RF Application Ultra-Fast Respose in Line/Load Transient Quick Start-Up (Typically 50S) <0.01A Standby Current When Shutdown. Low Dropout:220mV@300mA Wide Operating Voltage Ranges:2.5V to 5.5V TTL-logic-Controlled Shutdown Input Low Temperature Coefficient Current Limiting Protection Thermal Shutdown Protection Only 1F Output Capacitor Required for Stability High Power Supply Rejection Ratio Custom Voltage Available Fast output discharge Available in 5-Lead SOT-23 and SC-70 Package APPLICATIONS Cellular and Smart Phones Battery-Powered Equipment Laptop, Palmtops,Notebook Computers Hand-Held Instruments ORDERING INFORMATION PCMCIA Cards MP3 Players Portable Information Appliances DESCRIPTION The LR9193 is designed for portable RF and wireless applications with demanding performance and space requirements. The LR9193 performance is optimized for batterypowered systems to deliver ultra low noise and low quiescent current. A noise bypass pin is available for further reduction of output noise. Regulator ground current increases only slightly in dropout, further prolonging the battery life. The LR9193 also works with lowESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. The LR9193 consumes less than 0.01μA in shutdown mode and has fast turnon time less than 50μs. The other features include ultra low dropout voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. Available in the 5-lead of SC-70,SOT-23,packages. TYPICAL APPLICATION LR9193-XX XX Package: RN:SOT-23-5 URN:SC-70-5 1 3.3V-5.5V C1 1uF 0 Chip Enable 2 0 3 VIN VOUT 5 GND LR9193 EN 2.8V C2 1uF 0 BP 4 R1 100k Output Voltage: 12:1.2V 15:1.5V 18:1.8V 28:2.8V 33::3.3V CT: custom fixed output(50mv step) AD:Adjustable 0 C3 22nF 0 1/9 LESHAN RADIO COMPANY, LTD. Absolute Maximum Rating (Note 1) Input Supply Voltage (VCC) EN Input Voltage Output Voltage BP Voltage Output Current -0.3V to +6V -0.3V to +Vin -0.3V to Vin+0.3V -0.3V to +6V 300mA Maximum Junction Temperature Operating Temperature Range (Note2) Storage Temperature Range Lead Temperature (Soldering, 10s) 125°C -40°C to 85°C -65°C to 125°C 300°C Package Information VIN 1 2 EN 3 VOUT 4 BP MARKING GND 5 SOT23-5 Part Number LR9193-1.2 Top Mark X V Y M (Note 3) Temp Range -40°C to +85°C LR9193-2.8 XVYM -40°C to +85°C Thermal Resistance (Note 4): Package SOT23-5 ӨJA 250C/W ӨJC 130°C/W Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LR9193 is guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: X:Product Code V:Voltage Code Y:Year M:Month. Note 4: Thermal Resistance is specified with approximately 1 square of 1 oz copper. 2/9 LESHAN RADIO COMPANY, LTD. Pin Description PIN NAME 3 EN 4 2 5 1 BP GND VOUT VIN FUNCTION Chip Enable(Active High). Note that this pin is high impedance. There should be a pull low 100kΩ resistor connected to GND when the control signal is floating. Reference Noise Bypass. Ground. Output Voltage. Power Input Voltage. Block Diagram LR9193- X.X A LR9193- X.X B LR9193- X.X C LR9193- X.X D 3/9 LESHAN RADIO COMPANY, LTD. Electrical Characteristics (Note 5) (VIN=3.6V , EN=VIN , CIN=COUT=1uF ,CBP=22nF ,TA=25℃,unless otherwise noted.) Parameter Symbol Conditions Input Voltage VIN Output Voltage Accuracy(Note 6) VOUT VIN=3.6V, IOUT=1mA Current Limit ILIM Quiescent Current IQ Dropout Voltage VDROP RLOAD=1 VEN>1.2V, IOUT=0mA IOUT=200mA, VOUT=2.8V IOUT=300mA, VOUT=2.8V VIN=3.6V to 5.5V IOUT=1mA 1mA<IOUT<300mA VEN=GND, Shutdown VEN=GND or VIN VIN=3V to 5.5V, Shutdown VIN=3V to 5.5V, Start up Line Regulation ΔVLINE Load Regulation ΔVLOAD Standby Current ISTBY EN Input Bias Current Logic EN Low Input Logic Threshold High Power f=217Hz Supply Rejection f=10KHz Ratio Thermal Shutdown Temperature Thermal Shutdown Hysteresis IIBSD VIL VIH PSRR TSD TSDHY Cout=1uF, Iout=100mA Shutdown,Temp increasing Max Unit 2.5 -1 5.5 +1 V -2 +2 Min 400 Typ 430 % mA 90 130 130 180 uA mV 210 300 0.2 % 0.5 % 0.01 1 uA 0 100 nA 0.4 V 1.2 V -72 dB -70 165 ℃ 30 ℃ Note 5: 100% production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization. Note 6: This IC includes two kinds of output voltage accuracy versions.A:±1%,B:±2%. 4/9 LESHAN RADIO COMPANY, LTD. Typical Performance Characteristics Dropout Voltage vs. Load Current PSRR 300 0 CIN=COUT=1uF TA=25C -10 VIN=4V to 5V CIN=COUT=1uF,X7R -20 200 -30 PSRR(dB) Dropout Voltage(mV) 250 150 100 -40 -50 -60 -70 50 -80 0 0 50 100 150 200 Load Current(mA) 250 300 -90 10 IOUT=100mA IOUT=200mA 100 1000 10000 100000 1000000 Frequency(Hz) 5/9 LESHAN RADIO COMPANY, LTD. Typical Performance Characteristics Applications Information Like any low - dropout regulator, the exte rnal capacitors used with the LR9193 must be carefully selected for regulator stability and performance. Using a capacitor who se value is > 1 μFon the LR9193 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 qualit y 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 LR9193 is designed specifically to work with low ESR ceramic output capacitor in space-saving and performance conside ration. Using a ceramic capacitor whose value is at least 1 μF with ESR is > 25m Ω on the LR9193 output ensures stability. The LR 9193 still works well with output capacitor of other types d ue to the wide stable ESR range . 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 theLR9193 and returned to a clean analog ground. Bypass Capacitor and Low Noise Connec ting a 22nF between the BP pin and GND pin significantly reduces noise on the regulator output, it is critical that the capacitor connection between the BP pin and GND pin be direct and PCB traces should be as short as possible. There is a relationship between the bypass capacitor value and the LDO regulator turn on time. DC leakage on this pin can affect the LDO regulator output noise and voltage regulation performance. Enable Function The LR 9193 features an LDO regulator enable/disable function. To assure the LDO regulator will switch on, the EN turn on control level must be greater than 1.2 volts. The LDO regulator will go into the shutdown mode when the voltage on the EN pin falls below 0.4 volts. For to protect the system, the LR9193 have a quick 6/9 LESHAN RADIO COMPANY, LTD. dis charge function. If the enable function is not needed in a specific application, it may be tied to VIN to keep the LDO regulator in a continuously on state. formula : Thermal Considerations PD(max) = (125°C −25°C) / 250 = 400mW (SOT-23-5) Thermal protection limits power dissipation in LR9193. When the operation junction temperature exceeds 165°C, the OTP circuit starts the thermal shutdown function turn the pass element off. The pass element turn on again after the junction temperature cools by 30°C. For continue 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 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 TJ (max) is the maximum operation junction temperature 125°C, T A is the ambient temperature and the θJA is the junction to ambient thermal resistance. For recommended operating conditions specification of LR9193, where T J (max) is the maximum junction temperature of the die (125°C) and T A is the maximum ambient temperature. The junction to ambient thermal resistance (θJA is layout dependent) for SOT -23 -5 package is 250°C/W, SC-70 - 5 package is 333°C/W, on standard JEDEC 51- 3 thermal test board. The maximum power dissipation at T A= 25°C can be calculatedby following PD(max) = (125°C−25°C) / 333 = 300mW (SC-70-5) The maximum power dissipation depends on operating ambient temperature for fixed T J(max) and thermal resistance θJA. It is also useful to calculate the junction of temperature of the LR9193 under a set of specific condtions.In this exmaple let the Input voltage VIN =3.3V,the output current Io=300mA and the case temperature T A=40 °C measured by a thermalcouple during operation. The power dissipation for the Vo=2.8V version of the LR9193 can be calculated as: PD =(3.3V−2.8V)*300mA+3.6V*100uA =150mW And the junction temperature,TJ ,can be calculated as follows: TJ=TA+PD*θJA=40°C+0.15W*250°C/W =40°C+37.5°C=77.5°C<TJ(max) =125°C For this operating condition,TJ is lower than the absolute maximum operating junction temperature,125°C, so it is safe to use the LR9193 in this configuration. Layout considerations To improve ac performance such as PSRR, output noise,and transient response, it is recommended that the PCB be designed with separate ground planes for VIN and V OUT, with each ground plane connected only at the GND pin of the device. In addidion, the ground connection for the bypass capacitor should connect directly to the GND pin of the device. 7/9 LESHAN RADIO COMPANY, LTD. Package Description SC70-5 8/9 LESHAN RADIO COMPANY, LTD. SOT23-5 9/9