Datasheet MAX1684, MAX1685 (Maxim) - 3

Low-Noise, 14V Input, 1A, PWM Step-Down Converters MAX1684/MAX1685 ELECTRICAL CHARACTERISTICS (continued)
(VIN = V SHDN = 6V, STBY = SYNC/PWM = CVL, VBOOT = VOUT, FB = AGND, circuit of Figure 1,
TA = 0°C to +85°C
, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Quiescent Supply Current STBY = low, VIN = 2.7V 230 430 µA in Dropout Shutdown Supply Current SHDN = low 2 6 µA LX Leakage Current ILX VIN = 14V, VLX = 0 or 14V, SHDN = low 20 µA MAX1684 260 300 340 Oscillator Frequency fOSC kHz MAX1685 520 600 680 MAX1684 180 350 SYNC Capture Range kHz MAX1685 360 700 Maximum Duty Cycle 100 % Constant-Frequency Minimum MAX1684 10 (Note 3) % Duty Cycle MAX1685 20 Reference Output Voltage VREF IREF = 0 1.238 1.251 1.264 V Reference Load Regulation -1µA < IREF < 50µA 4 15 mV Reference Supply Regulation 2.7V < VBOOT < 5.5V 0.2 5 mV VIN = 3V to 14V, BOOT = AGND, CVL Regulator Output Voltage 2.7 3.0 3.15 V ICVL = 0 to 5mA CVL Dropout Voltage BOOT = AGND, ICVL = 5mA 120 mV CVL Undervoltage Lockout BOOT = AGND, CVL falling edge, 2.35 2.5 2.6 V Threshold typical hysteresis is 40mV CVH with Respect to VIN ICVH = -1mA -5.0 -4.6 -4.1 V BOOT falling edge, BOOT Switchover Threshold 2.35 2.5 2.65 V typical hysteresis is 0.1V Thermal Shutdown Threshold Typical hysteresis is +10°C (Note 4) 160 °C ILIM/SS Source Current VILIM/SS = 1.4V 3.3 4 4.65 µA Logic Input High Voltage VIH 2 V SHDN, STBY, SYNC/PWM Logic Input Low Voltage VIL 0.7 V Logic Input Current SHDN, STBY, SYNC/PWM -1 1 µA SYNC/PWM Pulse Width High or low period 500 ns
_______________________________________________________________________________________ 3