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MAX1644EAE-T Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX1644EAE-T Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 11 page 2A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (VIN = VCC = +3.3V, FBSEL = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) ELECTRICAL CHARACTERISTICS (VIN = VCC = +3.3V, FBSEL = GND, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) Note 2: Recommended operating frequency, not production tested. Note 3: Specifications from 0°C to -40°C are guaranteed by design, not production tested. RTOFF = 150k Ω VFB = 1.2V VFB = 1.2V ILX = 0.5A VIN = 3.0V to 5.5V, ILOAD = 0, FBSEL = GND or REF ILX = 0.5A CONDITIONS µs 1.03 1.63 tOFF Off-Time Default Period nA 0 250 IFB FB Input Bias Current µA 360 IIN + ICC No-Load Supply Current A 0.2 0.7 IIM Idle Mode Current Threshold A 2.3 3.5 ILIMIT Current-Limit Threshold m Ω 200 RON, P PMOS Switch On-Resistance m Ω 150 200 RON, N 2.48 2.57 3.276 3.390 V 3.0 5.5 VIN Input Voltage V 1.08 1.12 VREF Reference Voltage V VREF VIN Adjustable Output Voltage 1.08 1.12 UNITS MIN TYP MAX SYMBOL PARAMETER VIN = VCC = 4V to 5.5V, FBSEL = unconnected VIN = 3V to 5.5V, FBSEL = VCC VIN = 3V to 5.5V, FBSEL = REF VIN = 4.5V VIN = 3V NMOS Switch On-Resistance 150 VIN = 4.5V VIN = 3V V ILOAD = 0 to 2A, VFB = VOUT VOUT Preset Output Voltage Maximum Output RMS Current ARMS SS Sink Current ISS 100 µA SHDN Input Current I SHDN -0.5 0.5 µA SS Source Current ISS 3.5 5 6.5 µA SHDN Input Low Threshold VIL 0.8 V SHDN Input High Threshold VIH 2.0 V FBSEL Input Current -5 +5 µA 0.9 1.3 5.8 VSS = 1V V SHDN = 0 to VCC FBSEL = REF PARAMETER SYMBOL MIN TYP MAX UNITS Undervoltage Lockout Threshold VUVLO 2.5 2.6 2.7 V FB Input Bias Current IFB 0 80 200 nA tOFF 1.13 1.33 1.53 0.20 0.33 Off-Time Start-Up Period tOFF 4 · tOFF µs On-Time Period tON 0.4 µs CONDITIONS VFB = 1.2V RTOFF = 150k Ω RTOFF = 30.1k Ω VIN falling, hysteresis = 40mV FB = GND Off-Time Default Period 4.3 5.6 µs RTOFF = 499k Ω FBSEL Logic Thresholds 0.2 V FBSEL = GND 0.7 · VCC 0.7 · VCC - 0.2 + 0.2 FBSEL = unconnected VCC - 0.2 FBSEL = VCC |
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