NCP5661 Low Output Voltage, Ultra−Fast 1.0 A Low Dropout Linear Regulator with Enable The NCP5661 is a high performance, low dropout linear regulator designed for high power applications that require up to 1.0 A current. It is offered in both fixed and adjustable output versions. With output voltages as low as 0.9 V and ultra−fast response times for load transients, the NCP5661 also provides additional features such as Enable and Error Flag (for the fixed output version), increasing the utility of this device. A thermally robust, 5 pin DPAK, combined with an architecture that offers low ground current (independent of load), provides for a superior high−current LDO solution. Features • • • • • • • • • • • Ultra−Fast Transient Response (Settling Time: 1−3 ms) Low Noise Without Bypass Capacitor (26 mVrms) Low Ground Current Independent of Load (3.0 mA Maximum) Fixed/Adjustable Output Voltage Versions Enable Function Error Flag (Fixed Output Version) Current Limit Protection Thermal Protection 0.9 V Reference Voltage for Ultra−Low Output Operation Power Supply Rejection Ratio > 65 dB These are Pb−Free Devices Applications • • • • • • Servers ASIC Power Supplies Post Regulation for Power Supplies Constant Current Source Networking Equipment Gaming and STB Modules © Semiconductor Components Industries, LLC, 2005 July, 2005 − Rev. 3 http://onsemi.com MARKING DIAGRAM 661xG ALYWW 1 5 DPAK−5 CENTER LEAD CROP CASE 175AA Tab = Ground Pin: 1. Enable 2. Vin 3. Ground 4. Vout 5. Adj (Adjustable Output) 5. Error Flag (Fixed Output) x = A for Adjustable Version B for Fixed 1.2 V C for Fixed 3.3 V A = Assembly Location L = Wafer Lot Y = Year WW = Work Week G = Pb−Free ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 10 of this data sheet. 1 Publication Order Number: NCP5661/D NCP5661 PIN FUNCTION DESCRIPTION Pin Adj/Fixed Pin Name Description 1 Enable This pin allows for on/off control of the regulator. To disable the device, connect to Ground. If this function is not in use, connect to Vin. 2 Vin 3 Ground 4 Vout 5 Adj (Adjustable Version) 5 Error Flag (Fixed Version) Positive Power Supply Input Voltage Power Supply Ground Regulated Output Voltage This pin is connected to the resistor divider network and programs the output voltage. An Error Flag is triggered when the output voltage is out of regulation excluding transient signals that may occur. Requires a pullup resistor f 100 kW. MAXIMUM RATINGS Rating Symbol Value Unit Input Voltage Vin 18 V Output Pin Voltage Vout −0.3 to Vin +0.3 V Adjust Pin Voltage Vadj −0.3 to Vin +0.3 V Enable Pin Voltage Ven −0.3 to Vin +0.3 V Error Flag Voltage Vef −0.3 to Vin +0.3 V Error Flag Current Ief 3.0 mA RθJA RθJC 100 8.0 Operating Junction Temperature Range TJ −40 to +150 °C Storage Temperature Range Tstg −55 to +150 °C °C/W Thermal Characteristics Thermal Resistance, Junction−to−Air Thermal Resistance, Junction−to−Case Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected. NOTE: This device series contains ESD protection and exceeds the following tests: Human Body Model (HBM) JESD 22−A114−B Machine Model (MM) JESD 22−A115−A. The maximum package power dissipation is: *T T J(max) A P + D R qJA The bipolar process employed for this IC is fully characterized and rated for reliable 18 V VCCmax operation. To avoid damaging the part or degrading it’s reliability, power dissipation transients should be limited to under 20 W for DPAK. For open−circuit to short−circuit transient, PDTransient = VCCmax * ISC. http://onsemi.com 2 NCP5661 ELECTRICAL CHARACTERISTICS (Vin − Vout = 1.5 V, for typical values TJ = 25°C, for min/max values TJ = −40°C to 125°C, Cin = Cout = 150 mF unless otherwise noted.) Characteristic Symbol Min Typ Max Unit Input Voltage Vin 2.0 − 9.0 V Output Noise Voltage Vn − 26 − mVrms −1% −1.5% −2% − 0.9 − +1% +1.5% +2% ADJUSTABLE OUTPUT VERSION Output Voltage Accuracy TJ = 25°C (Iout = 10 mA to 1.0 A) TJ = −20 to +125°C (Iout = 10 mA to 1.0 A) TJ = −40 to +150°C (Iout = 10 mA to 1.0 A) Vout Adjustable Pin Input Current Iadj − 40 − nA Line Regulation (Iout = 10 mA, Vout+1.5 V < Vin < 7.0 V) REGline − 0.03 − % Load Regulation (10 mA < Iout < 1.0 A) REGload − 0.03 − % Dropout Voltage (Iout = 1.0 A) VDO − 1.0 1.3 V Peak Output Current Limit Iout 1.0 − − A Internal Current Limitation Ilim − 1.5 − A Ripple Rejection (120 Hz) Ripple Rejection (1.0 kHz) RR − − 70 65 − − dB TSHD − 160 − °C Iq Iqds − − 1.3 10 3.0 300 mA mA 1.3 − − − − 0.3 − − 0.5 0.5 − − Thermal Shutdown (Guaranteed by Design) V Ground Current Iout = 1.0 A Disabled State Enable Input Threshold Voltage Ven Voltage Increasing, On State, Logic High Voltage Decreasing, Off State, Logic Low Enable Input Current V mA Ien Enable Pin Voltage = 0.3 Vmax Enable Pin Voltage = 1.3 Vmin http://onsemi.com 3 NCP5661 ELECTRICAL CHARACTERISTICS (Vin − Vout = 1.5 V, for typical values TJ = 25°C, for min/max values TJ = −40°C to 125°C, Cin = Cout = 150 mF unless otherwise noted.) Characteristic Symbol Min Typ Max Unit Input Voltage Vin 2.0 − 9.0 V Output Noise Voltage (Vout = 0.9 V) Vn − 26 − mVrms −1% −1.5% −2% − Vout − +1% +1.5% +2% FIXED OUTPUT VOLTAGE Output Voltage Accuracy (Note 1) TJ = 25°C (Iout = 10 mA to 1.0 A) TJ = −20 to +125°C (Iout = 10 mA to 1.0 A) TJ = −40 to +150°C (Iout = 10 mA to 1.0 A) Vout V Line Regulation (Iout = 10 mA, Vout+1.5 V < Vin < 7.0 V) REGline − 0.03 − % Load Regulation (10 mA < Iout < 1.0 A) REGload − 0.2 − % Dropout Voltage (Iout = 1.0 A) VDO − 1.0 1.3 V Peak Output Current Limit Iout 1.0 − − A Internal Current Limitation Ilim − 1.5 − A Ripple Rejection (120 Hz) Ripple Rejection (1.0 kHz) RR − − 70 65 − − dB TSHD − 160 − °C Iq Iqds − − 1.3 30 3.0 300 mA mA 1.3 − − − − 0.3 − − 0.5 0.5 − − 88 90 92 94 97 97 Thermal Shutdown (Guaranteed by Design) Ground Current Iout = 1.0 A Disabled State Enable Input Threshold Voltage Ven Voltage Increasing, On State, Logic High Voltage Decreasing, Off State, Logic Low Enable Input Current V mA Ien Enable Pin Voltage = 0.3 Vmax Enable Pin Voltage = 1.3 Vmin Error Flag (Fixed Output) Veflt 1.2 V Output 3.3 V Output % of Vout Error Flag Output Low Voltage Saturation (Ief = 1.0 mA) Vefdo − 200 − mV Error Flag Leakage Iefleak − 1.0 − mA Tef − 50 − ms Error Flag Blanking Time (Note 2) 1. Fixed output voltages available at 0.9 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.0 V, 3.3 V per request. 2. Can be disabled per customer request. http://onsemi.com 4 NCP5661 Vin IN ON Enable Block Voltage Reference Block Cin EN OFF Vref = 0.9 V R3 Vout Output Stage R1 CC* ADJ R4 Cout R2 GND R1 + R2 ǒVVout * 1Ǔ ref GND *CC = 5.0 to 200 pF Figure 1. Typical Schematic, Adjustable Output Version Vin IN ON Cin Voltage Reference Block Enable Block Vref = 0.9 V R3 EN Rflag = 100 kW OFF Vout Output Stage Cc R1 Cout R4 R2 Error Flag GND GND Figure 2. Typical Schematic, Fixed Output Version http://onsemi.com 5 EF NCP5661 1.00 VDO, DROPOUT VOLTAGE (V) VDO, DROPOUT VOLTAGE (V) 1.2 1.0 0.8 0.6 0.4 0.2 0 −40 −20 0 20 40 60 80 100 120 TJ, JUNCTION TEMPERATURE (°C) 0.95 0.90 0.85 0.80 Vout = 2.5 V Adjustable Cin = 150 mF Cout = 10 to 150 mF TJ = 25°C 0.75 0.70 0.0 140 ISC, SHORT CIRCUIT LIMIT (A) IGND, GROUND CURRENT (mA) 0.4 0.5 0.6 0.7 0.8 0.9 1.0 2.0 3.0 2.5 2.0 1.5 1.0 0.5 −20 0 20 40 60 80 100 120 1.8 1.6 1.4 1.2 1.0 −40 140 TJ, JUNCTION TEMPERATURE (°C) −20 0 20 40 60 80 100 120 140 TJ, JUNCTION TEMPERATURE (°C) Figure 5. Ground Current vs. Temperature Figure 6. Short Circuit Current Limit vs. Temperature 0.95 0.900 Vout, OUTPUT VOLTAGE (V) Vout, OUTPUT VOLTAGE (V) 0.3 Figure 4. Dropout Voltage vs. Output Current 3.5 0.90 0.85 0.80 Iout = 10 mA Cin = 150 mF Cout = 1.0 to 150 mF TJ = 25°C 0.75 0.70 1.0 0.2 Iout, OUTPUT CURRENT (A) Figure 3. Dropout Voltage vs. Temperature 0 −40 0.1 2.0 3.0 4.0 5.0 6.0 7.0 8.0 0.898 0.896 0.892 0.890 0.0 9.0 Vin, INPUT VOLTAGE (V) Figure 7. Output Voltage vs. Input Voltage Vin = 3.3 V Iout = 1.0 A maximum Cin = 150 mF Cout = 1.0 to 150 mF TJ = 25°C 0.894 0.2 0.4 0.6 0.8 Iout, OUTPUT CURRENT (A) 1.0 Figure 8. Output Voltage vs. Output Load Current http://onsemi.com 6 NCP5661 0.9 90 OUTPUT CURRENT (A) 0.8 RR, RIPPLE REJECTION (dB) TA = 25°C L = 25 mm Copper 0.7 0.6 0.5 0.4 0.3 0.2 0.1 80 70 Iout = 10 mA 60 50 40 Vin = 4.0 V Vout = 0.9 V Cin = 0 mF Cout = 1.0 mF TJ = 25°C 30 20 10 0 0.0 0 2 4 6 8 10 12 14 16 20 0 1 10 INPUT−OUTPUT VOLTAGE DIFFERENTIAL (V) 90 90 NOISE DENSITY (nVrms/ǨHz) 100 80 70 60 Vin = 3.3 V Vout = 0.9 V Iout = 10 mA Cin = 150 mF Cout = 150 mF TJ = 25°C 40 30 20 10 80 70 60 50 Vin = 3.3 V Vout = 0.9 V Iout = 1.0 A Cin = 150 mF Cout = 150 mF TJ = 25°C 40 30 20 10 0 0 Start: 100 Hz Stop: 100 kHz Start: 100 Hz Stop: 100 kHz F, FREQUENCY (kHz) F, FREQUENCY (kHz) Figure 11. Noise Density vs. Frequency Figure 12. Noise Density vs. Frequency 1000 1000 100 100 150 mF 10 mF 10 1.0 100 mF 10 100 mF 1.0 10 mF 150 mF 0.10 Unstable Unstable ESR (W) ESR (W) 1000 Figure 10. Ripple Rejection vs. Frequency 100 50 100 F, FREQUENCY (kHz) Figure 9. Output Current vs. Input−Output Voltage Differential NOISE DENSITY (nVrms/ǨHz) Iout = 1.0 A Stable 0.10 Stable 0.01 0.01 0 100 200 300 400 500 600 700 800 900 1000 0 100 200 300 400 500 600 700 800 900 1000 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) Figure 13. 1.2 Volt Output Stability with Output Capacitor ESR Figure 14. 3.3 Volt Output Stability with Output Capacitor ESR http://onsemi.com 7 NCP5661 Iout = 10 mA to 1.0 A Iout 0.5 A/Div Iout 0.5 A/Div Vout 10 mV/Div Vout 10 mV/Div Vin = 4.0 V Vout = 0.9 V Cin = 150 mF Cout = 150 mF TJ = 25°C Vin = 4.0 V Vout = 0.9 V Cin = 150 mF Cout = 150 mF TJ = 25°C Iout = 1.0 A to 10 mA TIME (1.0 ms/Div) TIME (1.0 ms/Div) Figure 15. Load Transient Response Figure 16. Load Transient Response APPLICATION INFORMATION Adjustable Output Operation The NCP5661 is a high performance low dropout 1.0 A linear regulator suitable for high power applications, featuring an ultra−fast response time and low noise without a bypass capacitor. It is offered in both fixed and adjustable output versions with voltages as low as 0.9 V. Additional features, such as Enable and Error Flag (fixed output version) increase the utility of the NCP5661. It is thermally robust and includes the safety features necessary during a fault condition, which provide for an attractive high current LDO solution for server, ASIC power supplies, networking equipment applications, and many others. The application circuit for the adjustable output version is shown in Figure 1. The reference voltage is 0.9 V and the adjustable pin current is typically 40 nA. A resistor divider network, R1 and R2, is calculated using the following formula: R1 + R2 ǒVVout * 1Ǔ ref Current Limit Operation As the peak output current increases beyond its limitation, the device is internally clampled to 1.5 A, thus causing the output voltage to decrease and go out of regulation. This allows the device never to exceed the maximum power dissipation. Input Capacitor The recommended input capacitor value is a 150 mF OSCON with an Equivalent Series Resistance (ESR) of 50 mW. It is especially required if the power source is located more than a few inches from the NCP5661. This capacitor will reduce device sensitivity and enhance the output transient response time. The PCB layout is very important and in order to obtain the optimal solution, the Vin and GND traces should be sufficiently wide to minimize noise and unstable operation. Error Flag Operation The Error Flag pin on the NCP5661 will produce a logic Low when it drops below the nominal output voltage. Refer to the electrical characteristics for the threshold values at which point the Error Flag goes Low. When the NCP5661 is above the nominal output voltage, the Error Flag will remain at logic High. The external pullup resistor needs to be connected between Vin (Pin 1) and the Error Flag pin (Pin 5). A resistor of approximately 100 kW is recommended to minimize the current consumption. No pullup resistor is required if the Error Flag output is not being used. Output Capacitor Proper output capacitor selection is required to maintain stability. The NCP5661 is guaranteed to be stable at an output capacitance of, Cout > 10 mF with an ESR < 300 mW over the output current range of 10 mA to 1.0 A. For PCB layout considerations, place the recommended ceramic capacitor close to the output pin and keep the leads short. This should help ensure ultra−fast transient response times. http://onsemi.com 8 NCP5661 NCP5661 Evaluation Board Figure 17. Test Board used for Evaluation http://onsemi.com 9 NCP5661 ORDERING INFORMATION Device NCP5661DTADJRKG Nominal Output Voltage Package Adj (Pb−Free) NCP5661DT12RKG (Note 3) Fixed, 1.2 V (Pb−Free) NCP5661DT33RKG (Note 3) Fixed, 3.3 V (Pb−Free) Shipping† 2500 Tape & Reel DPAK 2500 Tape & Reel 2500 Tape & Reel 3. Fixed output voltages available at 0.9 V, 1.5 V, 1.8 V, 2.5 V, 3.0 V per request. †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. http://onsemi.com 10 NCP5661 PACKAGE DIMENSIONS DPAK−5 CENTER LEAD CROP CASE 175AA−01 ISSUE A −T− C B V NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. SEATING PLANE E R R1 Z A S DIM A B C D E F G H J K L R R1 S U V Z 1 2 3 4 5 U K F J L H D 5 PL G 0.13 (0.005) M T SOLDERING FOOTPRINT* 6.4 0.252 2.2 0.086 0.34 5.36 0.013 0.217 5.8 0.228 10.6 0.417 0.8 0.031 SCALE 4:1 mm Ǔ ǒinches *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. http://onsemi.com 11 INCHES MIN MAX 0.235 0.245 0.250 0.265 0.086 0.094 0.020 0.028 0.018 0.023 0.024 0.032 0.180 BSC 0.034 0.040 0.018 0.023 0.102 0.114 0.045 BSC 0.170 0.190 0.185 0.210 0.025 0.040 0.020 −−− 0.035 0.050 0.155 0.170 MILLIMETERS MIN MAX 5.97 6.22 6.35 6.73 2.19 2.38 0.51 0.71 0.46 0.58 0.61 0.81 4.56 BSC 0.87 1.01 0.46 0.58 2.60 2.89 1.14 BSC 4.32 4.83 4.70 5.33 0.63 1.01 0.51 −−− 0.89 1.27 3.93 4.32 NCP5661 The product described herein (NCP5661), may be covered by one or more of the following U.S. patents: 5,920,184; 5,834,926. There may be other patents pending. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: N. American Technical Support: 800−282−9855 Toll Free Literature Distribution Center for ON Semiconductor USA/Canada P.O. Box 61312, Phoenix, Arizona 85082−1312 USA Phone: 480−829−7710 or 800−344−3860 Toll Free USA/Canada Japan: ON Semiconductor, Japan Customer Focus Center 2−9−1 Kamimeguro, Meguro−ku, Tokyo, Japan 153−0051 Fax: 480−829−7709 or 800−344−3867 Toll Free USA/Canada Phone: 81−3−5773−3850 Email: [email protected] http://onsemi.com 12 ON Semiconductor Website: http://onsemi.com Order Literature: http://www.onsemi.com/litorder For additional information, please contact your local Sales Representative. NCP5661/D