RT9161/A 300/500mA Low Dropout Linear Voltage Regulator General Description Features The RT9161/A is a 300/500mA fixed output voltage low dropout linear regulator. Typical ground current is approximately 110μA, from zero to maximum loading conditions. Wide range of available output voltage fits most of applications. Built-in output current-limiting most thermal-limiting provide maximal protection against any fault conditions. z Low Dropout Voltage of 200mV at Output Current 100mA, 450mV at Output Current 300mA, and 750mV at 500mA Output Current z Guaranteed 300/500mA Output Current Internal 1.5Ω Ω P-MOSFET Draws No Base Current Low Ground Current 110μ μA For ease of application, the RT9161/A comes in the popular 3-pin SOT-23 (300mA), SOT-89 (300mA), SOT-223 (500mA), or TO-92 packages. z z z z z z z Ordering Information RT9161/A- z 2% Accuracy Output Voltage Input Voltage Range up to 12V Extremely Tight Load Regulation Fast Transient Response Current-limiting and Thermal-limiting RoHS Compliant and 100% Lead (Pb)-Free Applications Package Type V : SOT-23-3 X : SOT-89 G : SOT-223 ZL : TO-92 (L-Type) ZT : TO-92 (T-Type) z z z Voltage Regulator for LAN Card, CD-ROM, and DVD Wireless Communication Systems Battery Powered Systems Marking Information For marking information, contact our sales representative Lead Plating System P : Pb Free directly or through a Richtek distributor located in your G : Green (Halogen Free and Pb Free) area. Output Voltage 15 : 1.5V Pin Configurations 16 : 1.6V : (TOP VIEW) 49 : 4.9V 50 : 5.0V VIN 500mA Output Current 300mA Output Current 3 1 Note : Richtek products are : ` GND RoHS compliant and compatible with the current require- 3 VOUT GND SOT-23-3 ments of IPC/JEDEC J-STD-020. ` 2 2 VIN VOUT (TAB) SOT-89 Suitable for use in SnPb or Pb-free soldering processes. 2 1 GND 3 VIN VOUT (TAB) SOT-223 DS9161/A-35 April 2011 www.richtek.com 1 RT9161/A 3 2 VOUT 3 VOUT GND 1 VIN 2 1 VIN GND TO-92 (L-Type) TO-92 (T-Type) Typical Application Circuit RT9161/A VIN VOUT + CIN 1uF + VIN COUT 10uF GND VOUT Electrolytic Functional Pin Description Pin Name Pin Function VOUT Output Voltage. GND Ground. VIN Power Input. Function Block Diagram VIN VOUT Thermal Shutdown Error Amp - + Current Limiting Sensor 1.2V Reference GND www.richtek.com 2 DS9161/A-35 April 2011 RT9161/A Absolute Maximum Ratings z z z z z Input Voltage ---------------------------------------------------------------------------------------------------------------- −0.3 to 14V Operating Junction Temperature Range ------------------------------------------------------------------------------- −40°C to 125°C Storage Temperature Range --------------------------------------------------------------------------------------------- −65°C to 150°C Power Dissipation, PD @ TA = 25°C SOT-23-3 --------------------------------------------------------------------------------------------------------------------- 0.4W SOT-89 ----------------------------------------------------------------------------------------------------------------------- 0.571W SOT-223 --------------------------------------------------------------------------------------------------------------------- 0.741W TO-92 ------------------------------------------------------------------------------------------------------------------------- 0.625W Package Thermal Resistance (Note 1) SOT-23-3, θJA --------------------------------------------------------------------------------------------------------------- 250°C/W SOT-23-3, θJC --------------------------------------------------------------------------------------------------------------- 140°C/W SOT-89, θJA ----------------------------------------------------------------------------------------------------------------- 175°C/W SOT-89, θJC ----------------------------------------------------------------------------------------------------------------- 100°C/W SOT-223, θJA ---------------------------------------------------------------------------------------------------------------- 135°C/W SOT-223, θJC --------------------------------------------------------------------------------------------------------------- 15°C/W TO-92, θJA ------------------------------------------------------------------------------------------------------------------- 160°C/W TO-92, θJC ------------------------------------------------------------------------------------------------------------------- 125°C/W Electrical Characteristics (TA = 25°C, CIN = 1μF, COUT = 10μF, unless otherwise specified.) Parameter Symbol Output Voltage Accuracy ΔVOUT Test Conditions IL = 1mA, VIN = 5V Output Voltage Temperature Coefficient Line Regulation Load Regulation (Note 2) Current Limit (Note 3) RT9161 Dropout Voltage (Note 4) RT9161A Standby Current Min Typ Max Unit −2 -- 2 % -- 50 150 PPM/°C ΔVLINE IL = 1mA, VIN= 4.5 to 12V -- 2 3 %VOUT ΔVLOAD IL = 1mA to 300/500mA, VIN = 5V -- 1 30/50 mV ILIM VIN = 5V, VOUT = 0V 350 580 -- 500 900 -- VDROP IL = 300/500mA ISTANDBY IL = 0, VIN = 12V --- 450/750 600/1000 110 180 mA mV μA Note 1. θJA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Note 2. Regulation is measured at constant junction temperature, using pulsed ON time. Note 3. Current Limit is measured at constant junction temperature, using pulsed ON time. Note 4. The dropout voltage is defined as VIN − VOUT, which is measured when VOUT is VOUT(NORMAL) − 100mV. DS9161/A-35 April 2011 www.richtek.com 3 RT9161/A Typical Operating Characteristics Temperature Stability Quiescient Current vs. Temperature 0.14 3.4 Quiescient Current (mA) Output Voltage (V) 0.12 VOUT = 3.3V 3.2 3 2.8 2.6 VOUT = 2.5V 0.10 0.08 0.06 0.04 0.02 VIN = 5V 0.00 2.4 -50 -25 0 25 50 75 100 -30 125 0 Temperature (°C) 60 90 120 Temperature (°C) Dropout Voltage (VIN-VOUT) 1 Short Circuit Current 1.4 125°C 125°C 0.8 Short Circuit Current (A) Dropout Voltage (V) 30 25°C 0.6 0.4 0.2 1.2 25°C 1 0.8 0.6 0.4 0.2 VOUT = 3.3V 0 0 0 100 200 300 400 500 0 2 Line Transient Response 5 T 4 ≈ Output Voltage Deviation (mV) VOUT = 3.3V TA = 25°C Input Voltage Deviation (V) COUT = 10μF Electrolytic IOUT = 0.1A 6 TT 100 02 > -1001 > -200 www.richtek.com 4 6 8 10 Line Transient Response 7 Time(100μs/Div) (100μS/Div) Time COUT = 10μF Electrolytic IOUT = 0.1A 6 5 VOUT = 2.5V TA = 25°C T 4 ≈ ≈ Output Voltage Deviation (mV) Input Voltage Deviation (V) 7 4 Input/Output Differential (V) I Load (mA) 100 ≈ TT 02 > -1001 > -200 Time(100μs/Div) (100μS/Div) Time DS9161/A-35 April 2011 RT9161/A Load Transient Response VIN = 5V VOUT = 3.3V CIN = 1μF 40 COUT = 10μF 20 TA = 25°C TT 02 > -20 ≈ T 1> 1 -50 50 TA = 25°C 02 > TT ≈ 100 T 101 > -100 Time(100μs/Div) (100μS/Div) Time Load Transient Response VIN = 5V VOUT = 2.5V CIN = 1μF 40 COUT = 10μF TA = 25°C 20 02 > TT -20 ≈ T 11 > -50 PSRR 02 > -50 T -100 Time(100μs/Div) (100μS/Div) Time PSRR CIN = 1uF COUT = 10uF Tantalum VIN = 5V VOUT = 2.5V TA = 25°C -10 -40 ≈ 101 > 100mA -30 TT 100 0 PSRR (dB) -20 TA = 25°C 50 ≈ Time(100μs/Div) (100μS/Div) Time CIN = 1uF COUT = 10uF Tantalum VIN = 5V VOUT = 3.3V TA = 25°C VIN = 5V VOUT = 2.5V CIN = 1μF 100 COUT = 10μF 200 Load Current (mA) Load Current (mA) 50 150 -50 ≈ 100 PSRR (dB) Output Voltage Deviation (mV) Output Voltage Deviation (mV) Load Transient Response -10 ≈ Time Time(100μs/Div) (100μS/Div) 60 0 VIN = 5V VOUT = 3.3V CIN = 1μF 100 COUT = 10μF 200 Load Current (mA) 50 150 -50 ≈ 100 Load Current (mA) Output Voltage Deviation (mV) Output Voltage Deviation (mV) Load Transient Response 60 -20 100mA -30 -40 -50 10mA 10mA -60 -60 10 100 1000 1K 10000 10K Frequency (Hz) DS9161/A-35 April 2011 100000 100K 1000000 1M 10 100 1K 1000 10K 10000 100K 100000 1M 1000000 Frequency (Hz) www.richtek.com 5 RT9161/A Application Information A 10uF capacitor with 200mΩ or higher ESR, connecting between VOUT and GND pins, is recommended for stability. A capacitor with ESR smaller than 200 mΩ may cause VOUT oscillation as shown in Figure 1. Operating temperature should be well considered to ensure that the capacitance is no less than 10uF over the operating temperature range. Please take the notice that Aluminum electrolytic capacitors may cause VOUT oscillation when operating below −25°C. The capacitance can be increased without limit for better transient response. A 1uF or higher capacitor should be placed between VIN and GND to filter out input noise and ensure stable output voltage. Region of Stable COUT ESR vs. Load Current 100 VIN = 3.3V CIN = 1uF COUT = 10uF C OUT ESR (Ω) 10 PD(MAX) = ( TJ(MAX) − TA ) / θJA Where T J(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 RT9161/A, where T J(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. For SOT-223 packages, the thermal resistance θJA is 135°C/W on the standard JEDEC 51-3 single-layer 1S thermal test board. The maximum power dissipation at TA = 25°C can be calculated by following formula : PD(MAX) = ( 125°C − 25°C ) / 250 = 0.400 W for SOT-23-3 packages PD(MAX) = ( 125°C − 25°C ) / 175 = 0.571 W for SOT-89 packages PD(MAX) = ( 125°C − 25°C ) / 135 = 0.741 W for 1 SOT-223 packages Stable 0.1 PD(MAX) = ( 125°C − 25°C ) / 160 = 0.625 W for Instable TO-92 packages 0 100 200 300 400 500 Load Current (mA) Figure 1 Thermal protection limits power dissipation in RT9161/A. When the operation junction temperature exceeds 165°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 30°C. 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 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 : www.richtek.com 6 The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance θJA. For RT9161/A packages, the Figure 2 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. Maximum Power Dissipation (mW) 0.01 800 SOT-223 package 700 TO-29 package 600 SOT-89 package 500 400 300 SOT-23-3 package 200 100 0 0 15 30 45 60 75 90 105 120 Ambient Temperature (°C) Figure 2. Derating Curves DS9161/A-35 April 2011 RT9161/A Outline Dimension A D E L b e C D1 A1 Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 3.175 4.191 0.125 0.165 A1 1.143 1.372 0.045 0.054 b 0.406 0.533 0.016 0.021 C 0.406 0.533 0.016 0.021 D 4.445 5.207 0.175 0.205 D1 3.429 5.029 0.135 0.198 E 4.318 5.334 0.170 0.210 e 1.143 1.397 0.045 0.055 L 12.700 0.500 3-Lead TO-92 Plastic Package DS9161/A-35 April 2011 www.richtek.com 7 RT9161/A H D L C B e A A1 b Dimensions In Millimeters Dimensions In Inches Symbol 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 0.508 0.014 0.020 C 2.591 2.997 0.102 0.118 D 2.692 3.099 0.106 0.122 e 1.803 2.007 0.071 0.079 H 0.080 0.254 0.003 0.010 L 0.300 0.610 0.012 0.024 SOT-23-3 Surface Mount Package www.richtek.com 8 DS9161/A-35 April 2011 RT9161/A D D1 A B C C1 e e H A b b1 b Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 1.397 1.600 0.055 0.063 b 0.356 0.483 0.014 0.019 B 2.388 2.591 0.094 0.102 b1 0.406 0.533 0.016 0.021 C 3.937 4.242 0.155 0.167 C1 0.787 1.194 0.031 0.047 D 4.394 4.597 0.173 0.181 D1 1.397 1.753 0.055 0.069 e 1.448 1.549 0.057 0.061 H 0.356 0.432 0.014 0.017 3-Lead SOT-89 Surface Mount Package DS9161/A-35 April 2011 www.richtek.com 9 RT9161/A Dimensions In Millimeters Symbol Dimensions In Inches Min Max Min Max A 1.400 1.800 0.055 0.071 A1 0.020 0.100 0.001 0.004 b 0.600 0.840 0.024 0.033 B 3.300 3.700 0.130 0.146 C 6.700 7.300 0.264 0.287 D 6.300 6.700 0.248 0.264 b1 2.900 3.100 0.114 0.122 e 2.300 0.091 H 0.230 0.350 0.009 0.014 L 1.500 2.000 0.059 0.079 L1 0.800 1.100 0.031 0.043 3-Lead SOT-223 Surface Mount 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 10 DS9161/A-35 April 2011