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MAX687-MAX689 Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX687-MAX689 Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 12 page High-Accuracy, Low-Dropout Linear Regulators _______________________________________________________________________________________ 3 Note 1: Minimum VIN for regulated VOUT depends on the characteristics of the external PNP transistor, and on the load. The refer- ence and comparators are functional down to the minimum voltage specified, but the output may not be in regulation. Note 2: Dropout voltage is defined as VIN - VOUT when VOUT is 50mV below its value at VIN = VNOM + 1V. Note 3: The start-up time specification is the time taken from ON or SHDN rising to BASE sinking current. VOUT rise time is longer and is a function of load capacitance, C2, and load resistance, RL. Note 4: Minimum load capacitance is a function of RL. Minimum C2 = 10µF for loads up to 100mA and 1µF/10mA for higher loads. ESR of C2 should be no larger than 1/100 of RL. Guaranteed by design. Note 5: The nominal output voltage, VNOM, is defined under the default conditions of testing: VIN = 3.8V, IBASE = 1mA, TA = TMIN to TMAX. ELECTRICAL CHARACTERISTICS (continued) (VIN = 3.8V, SHDN = VIN (MAX688/MAX689), RB = 0Ω, C1 = 2.2µF, C2 = 10µF, C3 = 10nF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) Falling VOUT, comparators monitor VOUT Glitch immunity Rising SHDN, standby →on Shutdown Standby Falling VOUT, comparators monitor VOUT On, SHDN falling Output turns on CONDITIONS µs 100 PFO, SHDN Transient Rejection mV 70 SHDN Hysteresis 0.2 VSSD 1.0 1.2 VSSY V 1.25 VSON SHDN Threshold Voltages mV 110 170 VNOM - VPFT PFO Threshold Voltage Below VNOM (Note 5) mV 7 PFO Hysteresis V 2.96 VSD Shutdown Threshold Voltage V 1.0 VIH ON Threshold Voltage UNITS MIN TYP MAX SYMBOL PARAMETER ISOURCE = 50µA, part on, VIN = 2.7V V VOUT - 0.3 VOH PFO Output Voltage High ISINK = 1.2mA, VIN = 2.7V V 0.06 0.3 VOL PFO Output Voltage Low Output remains off 0.2 VIL nA 0.2 100 ON Input Leakage Current Falling VOUT, com- parators monitor VOUT V 3.07 3.13 3.19 VPFT PFO Threshold Voltage MAX688 MAX689 2.77 2.85 2.89 V SHDN = 1.23V nA -25 25 SHDN Input Current 10Hz ≤ f ≤ 10kHz, ILOAD = 200mA V PFO = 11V, V SHDN > 1.25V ISINK = 1.2mA, VIN = 2.7V µA 1 66 en Output Noise Voltage PFO Off Leakage Current V 0.06 0.3 VOL PFO Output Voltage Low 10Hz ≤ f ≤ 1MHz, ILOAD = 200mA µVRMS 105 Falling VOUT, comparators monitor VOUT mV 20 70 VPFT - VSD Shutdown Threshold Voltage Below VPFT mV 7 PFO Hysteresis MAX688/MAX689: SHDN, PFO MAX687: ON, PFO, SHDN |
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