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MAX17243 Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX17243 Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 18 page VSUP = VSUPSW = 14V, VEN = 14V, L1 = 2.2µH, CIN = 4.7µF, COUT = 44µF, CBIAS = 2.2µF, CBST = 0.1µF, RFOSC=12kΩ,TA = TJ = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C. www.maximintegrated.com Maxim Integrated │ 4 MAX17242/MAX17243 3.5V–36V, 2A/3A, Synchronous Buck Converter with 15µA Quiescent Current and Reduced EMI Electrical Characteristics (continued) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS PFM-Mode Output Voltage (Note 4) VOUT_ PFM_3.3V No load, VFB = VBIAS, PFM mode 3.23 3.3 3.4 V Load Regulation VFB = VBIAS, 30mA < ILOAD < 3A 0.5 % Line Regulation VFB = VBIAS, 6V < VSUPSW < 36V 0.02 %/V BST Input Current IBST_ON High-side MOSFET on, VBST - VLX = 5V 1.5 mA IBST_OFF High-side MOSFET off, VBST - VLX = 5V 1.5 µA LX Current Limit ILX MAX17243 3.75 5 6.25 A MAX17242 2.5 3.33 4.16 LX Rise Time VOUT = 5V, 3.3V 4 ns Spread Spectrum Spread spectrum enabled FOSC ±3% High-Side Switch On- Resistance RON_H ILX = 0.5A, VBIAS = 5V 60 140 mΩ High-Side Switch Leakage Current High-side MOSFET off, VSUP = 36V, VLX = 0V, TA = +25°C 1 5 µA Low-Side Switch On- Resistance RON_L ILX = 0.5A, VBIAS = 5V 35 70 mΩ Low-Side Switch Leakage Current Low-side MOSFET off, VSUP = 36V, VLX = 36V, TA = +25°C 1 5 µA FB Input Current IFB TA = +25°C 20 100 nA FB Regulation Voltage VFB FB connected to an external resistive divider, 6V < VSUPSW < 36V 0.99 1 1.01 V FB Line Regulation ∆VLINE 6V < VSUPSW < 36V 0.02 %/V Transconductance (from FB to COMP) gm VFB = 1V, VBIAS = 5V 700 µS Minimum On-Time tON_MIN 80 ns Maximum Duty Cycle DCMAX 98 99 % Oscillator Frequency RFOSC=73.2kΩ 400 kHz RFOSC=12kΩ 2.0 2.2 2.4 MHz SYNC, EN, AND SPS LOGIC THRESHOLDS External Input Clock Acquisition time tFSYNC 1 Cycle External Input Clock Frequency RFOSC=12kΩ(Note5) 1.8 2.6 MHz External Input Clock High Threshold VFSYNC_HI VFSYNC rising 1.4 V External Input Clock Low Threshold VFSYNC_LO VFSYNC falling 0.4 V FSYNC Leakage Current TA = +25°C 1 µA Soft-Start Time tSS 5.6 8 12 ms |
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