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FAN53526UC168X Datasheet(PDF) 11 Page - ON Semiconductor |
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FAN53526UC168X Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 22 page FAN53526 www.onsemi.com 11 TYPICAL CHARACTERISTICS (continued) (Unless otherwise specified, Auto PFM/PWM Mode, VIN = 3.6 V, VOUT = 1.15625V, VSEL = EN = VIN, TA = 25°C; circuit and components according to Figure 1 and Table 2. Efficiency test conditions; ILOAD: 1 mA to 3 A, L = 330 nH, DFE201612E−R33N (Toko). CIN = 4.7 mF, 0603, C1608X5R1A475K (TDK), COUT x 2 = 2X47 mF, 0603, GRM188R60J476ME (Murata).) IOUT (9500mA/div) 0mA 500mA VOUT (10mV/div) 0.6V offset 618mV + 16mV − 16mV 582mV Figure 17. Load Transient, 3.8 VIN, 0.6 VOUT, 0−500 mA, 100 ns Edge, 47 mF COUT Operating Description The FAN53526 is a step−down switching voltage regulator that delivers a programmable output voltage from an input voltage supply of 2.5 V to 5.5 V. Using a proprietary architecture with synchronous rectification, the FAN53526 is capable of delivering 3.0 A at over 80% efficiency. The regulator operates at a nominal frequency of 2.4 MHz at full load, which reduces the value of the external components to 330 nH or 470 nH for the output inductor and 44 μF for the output capacitor. High efficiency is maintained at light load with single−pulse PFM. An I2C−compatible interface allows transfers up to 3.4 Mbps. This communication interface can be used to: • Dynamically re−program the output voltage in 6.25 mV increments; • Reprogram the mode to enable or disable PFM; • Control voltage transition slew rate; or • Enable / disable the regulator. Control Scheme The FAN53526 uses a proprietary non−linear, fixed−frequency PWM modulator to deliver a fast load transient response, while maintaining a constant switching frequency over a wide range of operating conditions. The regulator performance is independent of the output capacitor ESR, allowing for the use of ceramic output capacitors. Although this type of operation normally results in a switching frequency that varies with input voltage and load current, an internal frequency loop holds the switching frequency constant over a large range of input voltages and load currents. For very light loads, the FAN53526 operates in Discontinuous Current Mode (DCM) single−pulse PFM, which produces low output ripple compared with other PFM architectures. Transition between PWM and PFM is relatively seamless, providing a smooth transition between DCM and CCM Modes. PFM can be disabled by programming the MODE bits in the CONTROL register in combination with the state of the VSEL pin . See table in the Control Register, 02h. Enable and Soft−Start When the EN pin is LOW; the IC is shut down, all internal circuits are off, and the part draws very little current. In this state, I2C can be written to or read from as long as input voltage is above the UVLO. The registers keep the content when the EN pin is LOW. The registers are reset to default values during a Power On Reset (POR). When the OUTPUT_DISCHARGE bit in the Control register is enabled (logic HIGH) and the EN pin is LOW or the BUCK_ENx bit is LOW, an 11 W load is connected from VOUT to GND to discharge the output capacitors. Raising EN while the BUCK_ENx bit is HIGH activates the part and begins the soft−start cycle. During soft−start, the modulator’s internal reference is ramped slowly to minimize surge currents on the input and prevent overshoot of the output voltage. Synchronous rectification is inhibited, allowing the IC to start into a pre−charged capacitive load. If large values of output capacitance are used, the regulator may fail to start. The maximum COUT capacitance for starting with a heavy constant−current load is approximately: |
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