ncp1521b ON Semiconductor, ncp1521b Datasheet
ncp1521b
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ncp1521b Summary of contents
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... DC- DC Converter High-Efficiency, Low Ripple, Adjustable Output Voltage The NCP1521B step- down DC- DC converter is a monolithic integrated circuit optimized for portable applications powered from one cell Li- Ion or three cell Alkaline/NiCd/NiMH batteries. The part, available in adjustable output voltage versions ranging from 0 ...
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... Figure 3. Efficiency vs. Output Current V battery VIN PWM/PFM 1 CONTROL 4.7 mF GND 2 LOGIC CONTROL Enable EN & THERMAL 3 SHUTDOWN Figure 4. Simplified Block Diagram NCP1521B V = 3.3 V OUT 25°C A 200 300 400 500 600 I (mA) OUT LIMIT FB 4 REFERENCE VOLTAGE http://onsemi ...
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... Human Body Model (HBM) per JEDEC standard: JESD22-A114. Machine Model (MM) per JEDEC standard: JESD22-A115. 4. Latchup current maximum rating per JEDEC standard: JESD78. 5. JEDEC Standard: J-STD-020A. NCP1521B Type Analog / Power supply input for the PFET power stage, analog and digital blocks. The pin must be decoupled to ground ...
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... The overall output voltage tolerance depends upon the accuracy of the external resistor (R1, R2). 7. Functionality guaranteed per design and characterization, see chapter ”USB Rail Powered Applications”. NCP1521B (Typical values are referenced +25°C, Min and Max values are referenced -40°C to +85° ...
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... Load Transient OUT 1.0 0 0.8 OUT 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 2.7 3.2 3.7 4 INPUT VOLTAGE (V) IN Figure 7. Shutdown Current vs. Supply Voltage NCP1521B vs. Input Voltage vs. Input Voltage vs. Temperature vs. Output Current vs. Input Voltage vs. Time vs. Time vs. Input Voltage vs. Time vs. Output Current vs. Time OUT 4.7 5 ...
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... IN A 100% 95% 90% 85% 80% 25°C 75% 70% 65% 60% 55% 50% 0 100 200 300 I , OUTPUT CURRENT (mA) OUT Figure 13. Efficiency vs. Output Current ( OUT NCP1521B 1.0% 0. OUT OUT 600 mA -0.5% -1. -40 Figure 10. Output Voltage Accuracy vs. Temperature 100 3.3 V OUT 95 1.8 V 90% 85 ...
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... Figure 17. Line Regulation ( 100 mA) OUT OUT V/div Time 20 ms/div Figure 19. 3 3.6 V Line Transient (Risetime = OUT OUT T = 255C) A NCP1521B V OUT 500 mV/div I LX 200 mV/div Time Time 2.5 ms/div 100 ms/div Figure 16. Short-Circuit Protection = 250 mA) 1.25 1.24 1. OUT 1 ...
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... Figure 23 100 mA Load Transient ( OUT V OUT 50 mV/div I OUT 200 mA/div Figure 25. 200 mA to 600 mA Load Transient ( OUT A NCP1521B 1.5 1.0 -40 °C 25°C 0.5 0 -0.5 -1.0 -1.5 400 500 600 0 Figure 24. 100 Load Transient = 255C) A Figure 26. 600 mA to 200 mA Load Transient = 255C) ...
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... recommended to keep the part in shutdown mode until the input voltage is 2 higher. PWM Operating Mode In this mode, the output voltage of the NCP1521B is regulated by modulating the on-time pulse width of the main switch fixed frequency of 1.5 MHz. The switching of the PMOS Q1 is controlled by a flip-flop ...
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... R : Inductor Resistance (DCR) INDUCTOR USB Rail Powered Applications For USB rail powered applications, NCP1521B is able to supply voltages up to 3.9 V, 600 mA, operating in PWM mode only, with high efficiency (Figure 29), low output voltage ripple and good load regulation results over all current range (Figure 30). ...
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... JMK212BY475MG TDK C2012X5ROJ475KB C1632X5ROJ475KT Output L-C Filter Design Considerations The NCP1521B operates at 1.5 MHz frequency and uses current mode architecture. The correct selection of the output filter ensures good stability and fast transient response. Due to the nature of the buck converter, the output L-C filter must be selected to work with internal compensation. ...
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... SW C OUT In PFM mode (at light load), the output voltage is regulated by pulse frequency modulation. The output voltage ripple is independent of the output capacitor value set by the threshold of PFM comparator. NCP1521B Table 4. LIST OF OUTPUT CAPACITOR Murata Taiyo Yuden LPO3010 TDK Feed-Forward Capacitor Selection The feed-forward capacitor sets the feedback loop response and is critical to obtain good loop stability ...
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... C SEATING 0.05 PLANE H T *For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. NCP1521B PACKAGE DIMENSIONS TSOP-5 CASE 483-02 ISSUE F NOTES: 1. DIMENSIONING AND TOLERANCING PER 2. CONTROLLING DIMENSION: MILLIMETERS MAXIMUM LEAD THICKNESS INCLUDES M 4 ...
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... K 6X BOTTOM VIEW The product described herein (NCP1521B), may be covered by the following U.S. patents: TBD. 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. “ ...