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TC2054 Datasheet(PDF) 3 Page - Microchip Technology |
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TC2054 Datasheet(HTML) 3 Page - Microchip Technology |
3 / 16 page © 2002 Microchip Technology Inc. DS21663B-page 3 TC2054/2055/2186 2.0 PIN DESCRIPTIONS Thedescriptionsof the pins arelistedinTable2-1. TABLE 2-1: PIN FUNCTION TABLE SHDN Input VIH SHDN Input High Threshold 60 —— %VIN VIN = 2.5V to 6.0V VIL SHDN Input Low Threshold — — 15 %VIN VIN = 2.5V to 6.0V ERROR OUTPUT VINMIN Minimum VIN Operating Volt- age 1.0 — — V VOUT ≥ 2.7V VOL Output Logic Low Voltage — — 400 mV 1 mA Flows to ERROR VTH ERROR Threshold Voltage — 0.95 x VR — V SeeFigure4-2 VHYS ERROR Positive Hysteresis — 50 — mV Note 8 tDELAY VOUT to ERROR Delay — 2 — msec VOUT from VR =3V to2.8V RERROR Resistance from ERROR to GND — 126 — Ω VDD =2.5V, VOUT =2.5V Note 1: The minimum VIN has to meet two conditions: VIN =2.7V and VIN =VR +VDROPOUT. 2: VR is the regulator output voltage setting. For example: VR = 1.8V, 2.7V, 2.8V, 2.85V, 3.0V, 3.3V. 3: TCVOUT = 4: Regulation is measured at a constant junction temperature using low duty cycle pulse testing. Load regulation is tested over a load range from 1.0mA to the maximum specified output current. Changes in output voltage due to heating effects are covered by the thermal regulation specification. 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value at a 1V differential. 6: Thermal Regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, exclud- ing load or line regulation effects. Specifications are for a current pulse equal to IMAX at VIN = 6V for T = 10msec. 7: The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temperature and the thermal resistance from junction-to-air (i.e. TA,TJ, θJA). 8: Hysteresis voltage is referenced by VR. 9: Time required for VOUT to reach 95% of VR (output voltage setting), after VSHDN is switched from 0 to VIN. Electrical Characteristics: VIN =VR +1V, IL =100µA, CL =3.3µF, SHDN >VIH,TA = 25°C, unless otherwise noted. BOLDFACE type specifications apply for junction temperature of -40°C to +125°C. Symbol Parameter Min Typ Max Units Test Conditions V OU TMAX V OUTM IN – () 10 6 × V OUT ∆T × ----------------------------------------------------------------------------------------- Pin Number Symbol Description 1VIN Unregulated supply input. 2 GND Ground terminal. 3 SHDN Shutdown control input. The regulator is fully enabled when a logic high is applied to this input. The regulator enters shutdown when a logic low is applied to this input. During shutdown, output voltage falls to zero, ERROR is open circuited and supply current is reduced to 0.5µA (max). 4 ERROR Out-of-Regulation Flag. (Open drain output). This output goes low when VOUT is out-of-tolerance by approximately -5%. 5VOUT Regulated voltage output. |
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