RT9167/A Low-Noise, Fixed Output Voltage, 200mA/500mA LDO Regulator General Description Features The RT9167/A is a 200mA/500mA low dropout and z Stable with Low-ESR Output Capacitor low noise micropower regulator suitable for portable z Low Dropout Voltage (220mV and 200mA) applications. The output voltages range from 1.5V to z Low Operation Current - 80µ µA Typical 5.0V in 100mV increments and 2% accuracy. The z Shutdown Function RT9167/A is designed for use with very low ESR z Low Noise Output capacitors. The output remains stable even with 1µF z Low Temperature Coefficient ceramic output capacitor. z Current and Thermal Limiting z Custom Voltage Available z SOT-25 and SOP-8 Packages The RT9167/A uses and internal PMOS as the pass device, which does not cause extra GND current in heavy load and dropout conditions. The shutdown Applications mode of nearly zero operation current makes the IC z Cellular Telephones suitable for battery-power devices. Other features z Laptop, Notebook, and Palmtop Computers include a reference bypass pin to improve low noise z Battery-powered Equipment performance, current limiting, and over temperature z Hand-held Equipment protection. Ordering Information RT9167/A- Package type B : SOT-25 Type I BR : SOT-25 Type II S : SOP-8 Operating temperature range C: Commercial standard Output voltage 15 : 1.5V Pin Configurations Part Number RT9167/A- CB (Plastic SOT-25) Pin Configurations TOP VIEW 5 1 RT9167/A- CBR (Plastic SOT-25) 4 2 3 4 1 2 : 49 : 4.9V 50 : 5.0V DS9167/A-10 July 2001 IN GND SHDN BP OUT TOP VIEW 5 16 : 1.6V : 1. 2. 3. 4. 5. 3 1. 2. 3. 4. 5. OUT GND IN SHDN BP TOP VIEW RT9167/A- CS SHDN 1 8 GND 500mA Output current IN 2 7 GND 200mA Output current OUT 3 6 GND BP 4 5 GND (Plastic SOP-8) www.richtek-ic.com.tw 1 RT9167/A Marking Information Part Number Part Number Marking RT9167-15CB E0 RT9167-50CB AS RT9167-16CB E1 RT9167A-15CB J0 RT9167-17CB E2 RT9167A-16CB J1 RT9167-18CB E3 RT9167A-17CB J2 RT9167-19CB E4 RT9167A-18CB J3 RT9167-20CB E5 RT9167A-19CB J4 RT9167-21CB E6 RT9167A-20CB J5 RT9167-22CB E7 RT9167A-21CB J6 RT9167-23CB E8 RT9167A-22CB J7 RT9167-24CB E9 RT9167A-23CB J8 RT9167-25CB EA RT9167A-24CB J9 RT9167-26CB EB RT9167A-25CB JA RT9167-27CB EC RT9167A-26CB JB RT9167-28CB ED RT9167A-27CB JC RT9167-29CB EE RT9167A-28CB JF RT9167-30CB EF RT9167A-29CB JE RT9167-31CB EG RT9167A-30CB JD RT9167-32CB EH RT9167A-31CB JG RT9167-33CB EJ RT9167A-32CB JH RT9167-34CB EK RT9167A-33CB JJ RT9167-35CB EL RT9167A-34CB JK RT9167-36CB EM RT9167A-35CB JL RT9167-37CB EN RT9167A-36CB JM RT9167-38CB EP RT9167A-37CB JN RT9167-39CB EQ RT9167A-38CB JP RT9167-40CB ER RT9167A-39CB JQ RT9167-41CB ES RT9167A-40CB JR RT9167-42CB ET RT9167A-41CB JS RT9167-43CB EU RT9167A-42CB JT RT9167-44CB EV RT9167A-43CB JU RT9167-45CB EW RT9167A-44CB JV RT9167-46CB EX RT9167A-45CB JW RT9167-47CB EY RT9167A-46CB JX RT9167-48CB EZ RT9167A-47CB JY RT9167-49CB AR RT9167A-48CB JZ www.richtek-ic.com.tw 2 Marking DS9167/A-10 July 2001 RT9167/A Part Number Marking Part Number Marking RT9167A-49CB CA RT9167-50CBR CZ RT9167A-50CB CB RT9167A-15CBR K0 RT9167-15CBR I0 RT9167A-16CBR K1 RT9167-16CBR I1 RT9167A-17CBR K2 RT9167-17CBR I2 RT9167A-18CBR K3 RT9167-18CBR I3 RT9167A-19CBR K4 RT9167-19CBR I4 RT9167A-20CBR K5 RT9167-20CBR I5 RT9167A-21CBR K6 RT9167-21CBR I6 RT9167A-22CBR K7 RT9167-22CBR I7 RT9167A-23CBR K8 RT9167-23CBR I8 RT9167A-24CBR K9 RT9167-24CBR I9 RT9167A-25CBR KA RT9167-25CBR IA RT9167A-26CBR KB RT9167-26CBR IB RT9167A-27CBR KC RT9167-27CBR IC RT9167A-28CBR KD RT9167-28CBR ID RT9167A-29CBR KE RT9167-29CBR IE RT9167A-30CBR KF RT9167-30CBR IF RT9167A-31CBR KG RT9167-31CBR IG RT9167A-32CBR KH RT9167-32CBR IH RT9167A-33CBR KJ RT9167-33CBR IJ RT9167A-34CBR KK RT9167-34CBR IK RT9167A-35CBR KL RT9167-35CBR IL RT9167A-36CBR KM RT9167-36CBR IM RT9167A-37CBR KN RT9167-37CBR IN RT9167A-38CBR KP RT9167-38CBR IP RT9167A-39CBR KQ RT9167-39CBR IQ RT9167A-40CBR KR RT9167-40CBR IR RT9167A-41CBR KS RT9167-41CBR IS RT9167A-42CBR KT RT9167-42CBR IT RT9167A-43CBR KU RT9167-43CBR IU RT9167A-44CBR KV RT9167-44CBR IV RT9167A-45CBR KW RT9167-45CBR IW RT9167A-46CBR KX RT9167-46CBR IX RT9167A-47CBR KY RT9167-47CBR IY RT9167A-48CBR KZ RT9167-48CBR IZ RT9167A-49CBR CC RT9167-49CBR CY RT9167A-50CBR CD DS9167/A-10 July 2001 www.richtek-ic.com.tw 3 RT9167/A Pin Description Pin Name Pin Function IN Input GND Ground SHDN Active Low Shutdown Input BP Reference Noise Bypass OUT Output Function Block Diagram Shutdown and Logic Control SHDN IN VREF + BP MOS Driver _ Error Amp OUT Current-Limit and Thermal Protection GND Typical Application Circuit RT9167 IN OUT VIN CIN 1µF ON OFF www.richtek-ic.com.tw 4 GND VOUT COUT 1µF SHDN BP CBP 10nF DS9167/A-10 July 2001 RT9167/A Absolute Maximum Ratings z Input Voltage z Power Dissipation, PD @ TA = 25°C 8V SOT-25 0.25W SOP-8 0.625W z Operating Junction Temperature Range −40°C to 125°C z Storage Temperature Range −65°C to 150°C z Package Thermal Resistance SOT-25, θJA z 250°C/W SOP-8, θJA 160°C/W Lead Temperature (Soldering, 5 sec.) 260°C Electrical Characteristics (VIN = 5.0V, CIN = 1µF, COUT = 1µF, TA = 25°C, unless otherwise specified) Parameter Symbol Input Voltage Range VIN Output Voltage Accuracy ∆VOUT Maximum Output Current Current Limit RT9167 RT9167A RT9167 RT9167A RT9167 ILIMIT IG RT9167A RT9167/A (Note) Dropout Voltage RT9167/A (VOUT(Nominal)≥3.0V RT9167/A Version) RT9167A VDROP Line Regulation ∆VLINE Load Regulation RT9167 RT9167A Min Typ Max 2.9 -- 7 IL = 50mA 2.7 -- 7 IL = 1mA -2 -- +2 200 -- -- 500 -- -- -- 300 -- -- 700 -- No Load -- 80 150 IOUT = 200mA -- 90 150 IOUT = 500mA -- 90 150 IOUT = 1mA -- 1.1 5 IOUT = 50mA -- 55 100 IOUT = 200mA -- 220 300 IOUT = 500mA -- 600 750 -0.2 -- +0.2 IOUT = 0mA to 200mA -- 0.01 0.04 IOUT = 0mA to 500mA -- 0.01 0.04 IMAX RT9167/A GND Pin Current Test Conditions ∆VLOAD RLOAD = 1Ω VIN = (VOUT+0.15) to 7V, IOUT = 1mA Units V % mA mA µA mV %/V %/mA SHDN Input High Threshold VIH VIN = 3V to 5.5V 1.6 -- -- V SHDN Input Low Threshold VIL VIN = 3V to 5.5V -- -- 0.4 V SHDN Bias Current ISD -- -- 100 nA Shutdown Supply Current IGSD -- 0.01 1 µA Thermal Shutdown Temperature TSD -- 155 -- °C Output Noise eNO CBP = 10nF, COUT = 10µF -- 350 -- nV Hz Ripple Rejection PSRR F = 100Hz, CBP = 10nF, COUT = 10µF -- 58 -- dB VOUT = 0V Notes: Dropout voltage definition: VIN - VOUT when VOUT is 50 mV below the value of VOUT at VIN = VOUT + 0.5V DS9167/A-10 July 2001 www.richtek-ic.com.tw 5 RT9167/A Typical Operating Charateristics GND Current vs. Temp. 120 3.32 105 GND Current ( µ A) Output Voltage (V) Output Voltage vs. Temp. 3.33 3.31 3.30 3.29 3.28 90 75 60 45 30 3.27 15 3.26 VOUT = 3.3V 3.25 -50 -25 0 25 50 75 100 125 VOUT = 3.3V 0 -50 150 -25 0 Temperature (°C) Dropout Voltage vs. Output Current 100 125 150 420 Current Limit (mA) Dropout Voltage (mV) (V) 75 Current Limit vs. Temp. 85°C 250 25°C 200 -40°C 150 100 360 300 240 180 120 50 RT9167 VOUT = 3.3V 60 VOUT = 3.3V 0 0 25 50 75 100 125 150 175 0 -50 200 -25 0 25 50 75 100 125 150 Temperature (°C ) Output Current (mA) Current Limit vs. Temp. 900 70 800 60 700 PSRR 50 PSRR (dB) Current Limit (mA) 50 480 300 600 500 400 40 30 20 300 RT9167A VOUT = 3.3V 200 100 -50 -25 0 25 50 75 100 Temperature ( °C ) www.richtek-ic.com.tw 6 25 Temperature ( °C) 125 ILOAD = 1mA, COUT = 4.7µF VOUT = 3.3V, CBP = 10nF 10 150 0 10 10 100 100 1K 1000 10K 10000 100K 100000 1M 1000000 Frequency (KHz) DS9167/A-10 July 2001 RT9167/A Load Transient Response 60 ≈ Output Voltage Deviation (mV) T 11 > -50 Time (50µS/Div) 150 COUT = 1µF CBP = 10nF 100 VOUT = 3.0V Loading = 1mA 50 TT 02 > ≈ ≈ 5 T 4 1↓ TT 02 > -20 Output Voltage (mV) Line Transient Response CBP = 10nF 20 Load Current (mA) 50 ≈ ≈ 50 T 11 > -50 Time (50µS/Div) Line Transient Response 150 COUT = 1µF Loading = 50mA 50 TT 02 > -50 ≈ ≈ 5 T 4 1↓ Time (1mS/Div) Output Voltage (mV) Loading = 1mA 50 TT 2> 0 -50 Input Voltage (V) CBP = 10nF 100 VOUT = 3.0V ≈ 5 ≈ T 4 1↓ Time (500µS/Div) DS9167/A-10 July 2001 Line Transient Response 60 COUT = 4.7µF CBP = 10nF 40 VOUT = 3.0V Loading = 50mA 20 TT 02 > -20 Input Voltage (V) Output Voltage (mV) Line Transient Response COUT = 4.7µF CBP = 10nF 100 VOUT = 3.0V Time (1mS/Div) 150 VOUT = 3.0V VIN = 4V COUT = 4.7µF 40 CIN = 10µF ≈ Input Voltage (V) Output Voltage Deviation (mV) Load Current (mA) Output Voltage (mV) TT 02 > -50 Input Voltage (V) 60 VOUT = 3.0V VIN = 4V COUT = 1µF 40 CIN = 10µF CBP = 10nF 20 -20 Load Transient Response ≈ 5 ≈ T 4 1↓ Time (500µS/Div) www.richtek-ic.com.tw 7 RT9167/A Applications Guides Capacitor Selection and Regulator Stability Region of Stable COUT ESR vs. Load Current 100 Like any low-dropout regulator, the external capacitors COUT = 4.7µF used with the RT9167/A must be carefully selected for regulator stability and performance. RT9167/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" from the input pin of the IC and returned to a clean analog ground. Any good quality ceramic or tantalum can be used for COUT ESR (mΩ) (Ω) Ω Using a capacitor whose value is > 1µF on the 10 COUT = 1µF 1 0.1 0.01 this capacitor. The capacitor with larger value and lower ESR (equivalent series resistance) provides better PSRR and line-transient response. 0.001 0 40 application. The RT9167/A is designed specifically to work with low ESR ceramic output capacitor in spacesaving and performance consideration. Using a ceramic capacitor whose value is at least 1uF with ESR is > 5mΩ on the RT9167/A output ensures stability. The RT9167/A still works well with output capacitor of other types due to the wide stable ESR 120 160 200 Fig. 1 The output capacitor must meet both requirements for minimum amount of capacitance and ESR in all LDOs 80 Load Current (mA) Note that some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. It may be necessary to use 2.2µF or more to ensure stability at temperatures below -10°C in this case. Also, tantalum capacitors, 2.2µF or more may be needed to maintain capacitance and ESR in the stable region for strict application environment. range. Fig.1 shows the curves of allowable ESR range Tantalum capacitors maybe suffer failure due to surge as a function of load current for various output current when it is connected to a low-impedance voltages and capacitor values. Output capacitor of source of power (like a battery or very large capacitor). larger capacitance can reduce noise and improve If a tantalum capacitor is used at the input, it must be load-transient response, stability, and PSRR. The guaranteed to have a surge current rating sufficient for output capacitor should be located not more than the application by the manufacture. 0.5" from the VOUT pin of the RT9167/A and returned to a clean analog ground. Use a 10nF bypass capacitor at BP for low output voltage noise. The capacitor, in conjunction with an internal 200KΩ resistor, which connects bypass pin and the band-gap reference, creates an 80Hz lowpass filter for noise reduction. Increasing the capacitance will slightly decrease the output noise, but increase the start-up time. The capacitor connected to the bypass pin for noise reduction must have very low leakage. This capacitor leakage current causes the output voltage to decline by a proportional amount to the current due to the voltage drop on the internal 200KΩ resistor. Fig. 2 shows the power on response. www.richtek-ic.com.tw 8 DS9167/A-10 July 2001 RT9167/A Internal P-Channel Pass Transistor CBP = 1nF The RT9167/A features a typical 1.1Ω P-channel MOSFET Voltage (0.5V / DIV) CBP = 10nF pass transistor. It provides several advantages over similar designs using PNP pass transistors, including longer battery life. The P-channel MOSFET requires no base drive, which reduces quiescent current considerably. PNP-based regulators waste considerable current in dropout when the pass transistor saturates. They also use high base-drive currents under large loads. The RT9167/A does not VOUT = 3.0V 0 5.0 10.0 suffer from these problems and consume only 80µA of quiescent current whether in dropout, light-load, or 15.0 heavy-load applications. Time (ms) Fig. 2 Input-Output (Dropout) Voltage A Load-Transient Considerations regulator’s minimum input-output voltage differential (or dropout voltage) determines the The RT9167/A load-transient response graphs (see lowest usable supply voltage. In battery-powered Typical two systems, this will determine the useful end-of-life components of the output response: a DC shift from battery voltage. Because the RT9167/A uses a P- the output impedance due to the load current channel MOSFET pass transistor, the dropout change, and the transient response. The DC shift is voltage is a function of drain-to-source on-resistance quite small due to the excellent load regulation of the [RDS(ON)] multiplied by the load current. Operating Characteristics) show IC. Typical output voltage transient spike for a step change in the load current from 0mA to 50mA is tens Reverse Current Path mV, depending on the ESR of the output capacitor. The power transistor used in the RT9167/A has an Increasing inherent diode connected between the regulator the output capacitor’s value and decreasing the ESR attenuates the overshoot. input and output (see Fig.3). If the output is forced Shutdown Input Operation above the input by more than a diode-drop, this The RT9167/A is shutdown by pulling the SHDN flow from the VOUT terminal to VIN. This diode will input low, and turned on by driving the input high. If this feature is not to be used, the SHDN input should be tied to VIN to keep the regulator on at all times (the SHDN input must not be left floating). diode will become forward biased and current will also be turned on by abruptly stepping the input voltage to a value below the output voltage. To prevent regulator mis-operation, a Schottky diode should be used in any applications where To ensure proper operation, the signal source used to input/output voltage conditions can cause the drive the SHDN input must be able to swing above and internal diode to be turned on (see Fig.4). As shown, below the specified turn-on/turn-off voltage thresholds the Schottky diode is connected in parallel with the which guarantee an ON or OFF state (see Electrical internal parasitic diode and prevents it from being Characteristics). The ON/OFF signal may come from turned on by limiting the voltage drop across it to either CMOS output, or an open-collector output with about 0.3V. < 100 mA to prevent damage to the part. pull-up resistor to the RT9167/A input voltage or another logic supply. The high-level voltage may exceed the RT9167/A input voltage, but must remain within the absolute maximum ratings for the SHDN pin. DS9167/A-10 July 2001 www.richtek-ic.com.tw 9 RT9167/A Current Limit and Thermal Protection The RT9167 includes a current limit which monitors VIN and controls the pass transistor’s gate voltage limiting VOUT the output current to 300mA Typ. (700mA Typ. for RT9167A). Thermal-overload protection limits total power dissipation in the RT9167/A. When the junction Fig. 3 temperature exceeds TJ = +155°C, the thermal sensor signals the shutdown logic turning off the pass transistor and allowing the IC to cool. The thermal sensor will turn the pass transistor on again after the IC’s junction temperature cools by 10°C, resulting in a pulsed output during continuous thermal-overload VIN conditions. Thermal-overloaded protection is designed VOUT to protect the RT9167/A in the event of fault conditions. Do not exceed the absolute maximum junctiontemperature rating of TJ = +150°C for continuous Fig. 4 operation. The output can be shorted to ground for an indefinite amount of time without damaging the part by cooperation of current limit and thermal protection. Operating Region and Power Dissipation The maximum power dissipation of RT9167/A depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. The power dissipation across the device is P = IOUT (VIN - VOUT). The maximum power dissipation is: PMAX = (TJ - TA) /θJA where TJ - TA is the temperature difference between the RT9167/A die junction and the surrounding environment, θJA is the thermal resistance from the junction to the surrounding environment. The GND pin of the RT9167/A performs the dual function of providing an electrical connection to ground and channeling heat away. Connect the GND pin to ground using a large www.richtek-ic.com.tw 10 pad or ground plane. DS9167/A-10 July 2001 RT9167/A Package Information D C B b H A e Symbol L A1 Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 0.889 1.295 0.035 0.051 A1 0.000 0.152 0.000 0.006 B 1.397 1.803 0.055 0.071 b 0.356 0.559 0.014 0.022 C 2.591 2.997 0.102 0.118 D 2.692 3.099 0.106 0.122 e 0.838 1.041 0.033 0.041 H 0.102 0.254 0.004 0.010 L 0.356 0.610 0.014 0.024 SOT- 25 Surface Mount Package DS9167/A-10 July 2001 www.richtek-ic.com.tw 11 RT9167/A H A M J B F C D Symbol I Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 4.801 5.004 0.189 0.197 B 3.810 3.988 0.150 0.157 C 1.346 1.753 0.053 0.069 D 0.330 0.508 0.013 0.020 F 1.194 1.346 0.047 0.053 H 0.178 0.254 0.007 0.010 I 0.102 0.254 0.004 0.010 J 5.791 6.198 0.228 0.244 M 0.406 1.270 0.016 0.050 8–Lead SOP Plastic Package www.richtek-ic.com.tw 12 DS9167/A-10 July 2001 RT9167/A DS9167/A-10 July 2001 www.richtek-ic.com.tw 13 RT9167/A RICHTEK TECHNOLOGY CORP. RICHTEK TECHNOLOGY CORP. Headquarter Taipei Office (Marketing) 6F, No. 35, Hsintai Road, Chupei City 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Hsinchu, Taiwan, R.O.C. Taipei County, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749 Tel: (8862)89191466 Fax: (8862)89191465 Email: [email protected] www.richtek-ic.com.tw 14 DS9167/A-10 July 2001