LESHAN RADIO COMPANY, LTD. 300mA Ultra-low Noise, Ultra-Fast CMOS LDO Regulator FEATURES LR9198 Hand-Held Instruments PCMCIA Cards MP3/MP4/MP5 Players Portable Information Appliances Ultra-low Noise for RF Application Ultra-Fast Response in Line/Load Transient <0.01µA Standby Current When Shutdown. Low Dropout:210mV@300mA Wide Operating Voltage Ranges:2V to 6V TTL-logic-Controlled Shutdown Input Low Temperature Coefficient Current Limiting Protection Thermal Shutdown Protection Only 1µF 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 DESCRIPTION The LR9198 is designed for portable RF and wireless applications with demanding performance and space requirements. The LR9198 performance is optimized for battery-powered systems to deliver ultra low noise and low quiescent current. Regulator ground current increases only slightly in dropout, further prolonging the battery life. The LR9198 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. The LR9198 consumes less than 0.01µA in shutdown mode and has fast turn-on 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 SC-70 and SOT-23 packages. ORDERING INFORMATION TYPICAL APPLICATION LR9198 XX X X X XXX LR9198 28 AA Package: RN: SOT-23-5 URN: SC-70-5 VIN 1 CIN Features P: Standard (default, lead free) C: Customized Enable Option: A: active high with internal 8 MΩ pull down B: active low with internal 8 MΩ pull up Output Voltage Accuracy A: ±1% B: ±2% Output Voltage: 12: 1.2V 15: 1.5V 18:1.8V 25:2.5V 28: 2.8V 30: 3.0V 33:3.3V 50:5.0V CT: custom fixed output (50mV step) VIN 2 Chip Enable 3 VOUT 5 VOUT COUT LR9198 GND EN NC 4 Application hints: Output capacitor (COUT≥2.2uF) is recommended in LR9198-1.2V application to assure the stability of circuit. 1 LESHAN RADIO COMPANY, LTD. Absolute Maximum Rating Input Supply Voltage (VIN) EN Input Voltage Output Voltage Output Current (Note 1) -0.3V to +6V -0.3V to +VIN -0.3V to VIN+0.3V 300mA Maximum Junction Temperature 125°C (Note2) Operating Temperature Range -40°C to 85°C Storage Temperature Range -65°C to 125°C Lead Temperature (Soldering, 10s) 300°C Package Information SOT23 SOT2323-5/SC70 SC7070-5 TOP VIEW VIN 1 Part Number VOUT 4 NC MARKING GND 2 EN 5 3 Top Mark Temp Range (Note3) LR9198-12 -40°C to +85°C EAYW LR9198-15 EBYW -40°C to +85°C LR9198-18 ECYW -40°C to +85°C LR9198-25 EDYW -40°C to +85°C LR9198-28 EEYW -40°C to +85°C LR9198-30 EFYW -40°C to +85°C LR9198-33 EGYW -40°C to +85°C LR9198-50 EIYW -40°C to +85°C Thermal Resistance (Note 4) Package SOT23-5 SC70-5 ӨJA 250°C/W 333°C/W ӨJC 130°C/W 170°C/W Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LR9198 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(LR9198:E) V: Voltage Code(1.2V:A, 1.5V:B, 1.8V:C, 2.5V:D, 2.8V:E, 3.0V:F, 3.3V:G, 5.0V:I) Y: Year of manufacturing(9:2009) W: Week of manufacturing(W:A-Z, a-z). Note 4: Thermal Resistance is specified with approximately 1 square of 1 oz copper. 2 LESHAN RADIO COMPANY, LTD. Pin Description PIN 1 2 NAME VIN GND 3 EN 4 5 NC VOUT FUNCTION Power Input Voltage. Ground. Chip Enable Pin with two options. A: active high with internal 8 MΩ pull down B: active low with internal 8 MΩ pull up No Connection. Output Voltage. Block Diagram LR9198 XX XA LR9198 XX XB 3 LESHAN RADIO COMPANY, LTD. Electrical Characteristics (Note 5) (VIN=3.6V, EN=VIN, CIN=COUT=1µF, TA=25℃, unless otherwise noted.) Parameter Symbol Conditions MIN Input Voltage VIN 2 Output Voltage Accuracy -1 VIN=3.6V, ∆VOUT (Note 6) IOUT=1mA -2 Current Limit ILIM 400 RLOAD=1Ω Quiescent Current IQ VEN>1.2V, IOUT=0mA IOUT=200mA, VOUT=2.8V Dropout Voltage VDROP IOUT=300mA, VOUT=2.8V V =3.6V to 5.5V (Note 7) IN ∆VLINE Line Regulation IOUT=1mA (Note 8) ∆VLOAD 1mA<IOUT<300mA Load Regulation (Note 9) Output Voltage TCVOUT IOUT=1mA Temperature Coefficient VEN=GND, Standby Current ISTBY Shutdown EN Input Bias Current IIBSD VEN=GND or VIN VIN=3V to 5.5V, EN Logic Low VIL Shutdown Input VIN=3V to 5.5V, Threshold Logic High VIH 1.2 Start up Output Noise 10Hz to100KHz, eNO Voltage IOUT=200mA Power f=217Hz Supply PSRR IOUT=100mA f=1KHz Rejection f=10KHz Ratio Thermal Shutdown Shutdown, Temp TSD increasing Temperature Thermal Shutdown TSDHY Hysteresis TYP MAX 6 +1 +2 unit V % 430 90 130 mA µA 130 180 210 300 0.05 0.17 %/V 2 %/A mV ±60 0.01 ppm/℃ 1 µA 500 nA 0.4 V V 100 µVRMS -78 -72 dB -52 165 ℃ 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%. VOUT 1 − VOUT 2 ∆VIN × VOUT ( normal ) Note 7: Line regulation is calculated by ∆V LINE = × 100 Where VOUT1 is the output voltage when VIN=5.5V, and VOUT2 is the output voltage when VIN=3.6V, △VIN=1.9V . VOUT (normal) =2.8V. VOUT 1 − VOUT 2 Note 8: Load regulation is calculated by ∆V × 100 LOAD = ∆I × V OUT OUT ( normal ) Where VOUT1 is the output voltage when IOUT=1mA, and VOUT2 is the output voltage when IOUT=300mA. △IOUT=0.299A, VOUT(normal)=2.8V. ∆VOUT Note 9: The temperature coefficient is calculated by TC VOUT = ∆T × VOUT 4 LESHAN RADIO COMPANY, LTD. Typical Performance Characteristics Output Voltage Vs. Temperature Quiescent Current Vs. Temperature 140 3.0 VIN=3.6V Output Voltage(V) Quiescent Current(uA) CIN=COUT=1uF 2.9 VIN=3.6V CIN=COUT=1uF 130 2.8 2.7 120 110 100 90 80 2.6 70 2.5 -50 -25 0 25 50 75 100 60 -50 125 -25 0 25 50 Dropout Voltage Vs. Load Current VIN=4.2V CIN=1uF,COUT=1uF,X7R -10 ILOAD=1mA ILOAD=100mA ILOAD=200mA -20 -30 PSRR(dB) 200 150 100 -40 -50 -60 TJ=85°C TJ=25°C TJ=-40°C 50 0 50 100 150 200 250 -70 -80 300 -90 10 100 Load Current(mA) 1000 10000 100000 Frequency(Hz) EN Pin Shutdown Threshold Vs. Temperature Current Limit Vs. Input Voltage 500 1.05 VIN=3.6V 1.00 480 CIN=COUT=1uF CIN=COUT=1uF VOUT=2.8V 460 Current Limit(mA) Dropout Voltage(mV) 125 PSRR CIN=COUT=1uF 250 EN Pin Shutdown Threshold(V) 100 0 300 0 75 Temperature(°C) Temperaute(°C) 0.95 0.90 0.85 440 420 400 380 360 0.80 340 320 0.75 -50 -25 0 25 50 Temperature(°C) 75 100 125 300 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Input Voltage(V) 5 LESHAN RADIO COMPANY, LTD. 6 LESHAN RADIO COMPANY, LTD. Output Voltage(V) VOUT Vs.VIN 3.0 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 1.0 CIN=COUT=1uF ILoad=1mA ILoad=100mA ILoad=300mA 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Input Voltage(V) 7 LESHAN RADIO COMPANY, LTD. Applications Information Like any low-dropout regulator, the external capacitors used with the LR9198 must be carefully selected for regulator stability and performance. Using a capacitor whose value is > 1µF on the LR9198 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 LR9198 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 > 25mΩ on the LR9198 output ensures stability. The LR9198 still works well with output capacitor of other types due 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 the BL9198 and returned to a clean analog ground. Enable Function The LR9198 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 shut- down mode when the voltage on the EN pin falls below 0.4 volts. For to protect the system, the LR9198 have a quick discharge 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. Thermal Considerations Thermal protection limits power dissipation in LR9198. When the operation junction temperature exceeds 165°C, the OTP circuit starts the thermal shutdown function turn the pass element off. The pass element turns 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) ×IOUT + VIN×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, TA is the ambient temperature and the θJA is the junction to ambient thermal resistance. For recommended operating conditions specification of LR9198, where TJ(MAX) is the maximum junction temperature of the die (125°C) and TA is the maximum ambient temperature. The junction to ambient thermal resistance (θJA is layout dependent) 8 LESHAN RADIO COMPANY, LTD. for SOT-23-5 package is 250°C/W, SC-705 package is 333°C/W, on standard JEDEC 51-3 thermal test board. The maximum power dissipation at TA= 25°C can be calculated by following formula: with separate ground planes for VIN and VOUT, with each ground plane connected only at the GND pin of the device. PD(MAX) = (125°C−25°C)/333 = 300mW (SC-70-5) PD(MAX) = (125°C−25°C)/250 = 400mW (SOT-23-5) The maximum power dissipation depends on operating ambient temperature for fixed TJ(MAX) and thermal resistance θJA. It is also useful to calculate the junction of temperature of the BL9198 under a set of specific conditions. In this example let the Input voltage VIN=3.3V, the output current Io=300mA and the case temperature TA=40°C measured by a thermal couple during operation. The power dissipation for the VOUT=2.8V version of the BL9198 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 LR9198 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 9 LESHAN RADIO COMPANY, LTD. LR9198-2.8V Layout Circuit VIN VIN 1 C4 VIN 2 1 2 3 3 1 5 LR9198 C1 JP VOUT VIN VOUT C3 GND EN NC 4 2 3 TOP Layer Layout BOTTOM Layer Layout 10 LESHAN RADIO COMPANY, LTD. Package Description SC-70-5 Surface Mount Package Symbol A A1 B b C D e H L Dimensions In Millimeters Min 0.800 0.000 1.150 0.150 1.800 1.800 Max 1.100 0.100 1.350 0.400 2.450 2.250 Dimensions In Inches Min 0.031 0.000 0.045 0.006 0.071 0.071 0.650 Max 0.044 0.004 0.054 0.016 0.096 0.089 0.026 0.080 0.260 0.003 0.010 0.210 0.460 0.008 0.018 11 LESHAN RADIO COMPANY, LTD. SOT-23-5 Surface Mount Package Symbol A A1 B b C D e H L Dimensions In Millimeters Dimensions In Inches Min Max Min Max 0.889 0.000 1.397 0.356 2.591 2.692 0.838 0.080 0.300 1.295 0.152 1.803 0.559 2.997 3.099 1.041 0.254 0.610 0.035 0.000 0.055 0.014 0.102 0.106 0.033 0.003 0.012 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024 12