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MIC29371-3.3BT Datasheet(PDF) 5 Page - Micrel Semiconductor |
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MIC29371-3.3BT Datasheet(HTML) 5 Page - Micrel Semiconductor |
5 / 9 page MIC2937A/29371/29372 Micrel MIC2937A/29371/29372 22 October 1999 Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the device outside of its rated operating conditions. The maximum allowable power dissipation is a function of the maximum junction temperature, T J (MAX), the junction-to-ambient thermal resistance, θJA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: P (MAX) = (TJ(MAX) – TA) / θJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. Note 2: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. Note 3: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Changes in output voltage due to heating effects are covered by the thermal regulation specification. Note 4: Dropout Voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V differential. At low values of programmed output voltage, the minimum input supply voltage of 4.3V over temperature must be taken into account. The MIC2937A operates down to 2V of input at reduced output current at 25 °C. Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current plus the ground pin current. Note 6: The MIC2937A family features fold-back current limiting. The short circuit (V OUT = 0V) current limit is less than the maximum current with normal output voltage. Note 7: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 200mA load pulse at V IN = 20V (a 4W pulse) for T = 10ms. Note 8: V REF ≤ V OUT ≤ (V IN – 1 V), 4.3V ≤ V IN ≤ 26V, 5mA < I L ≤ 750 mA, T J ≤ TJ MAX. Note 9: Comparator thresholds are expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage measured at 6V input (for a 5V regulator). To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = V OUT /V REF = (R1 + R2)/R2. For example, at a programmed output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95 mV x 5V/1.235 V = 384 mV. Thresholds remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed. Note 10: Circuit of Figure 3 with R1 ≥ 150kΩ. V SHUTDOWN ≥ 2V and V IN ≤ 26V,V OUT = 0. Note 11: When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to ground. Note 12: Maximum positive supply voltage of 60V must be of limited duration (< 100ms) and duty cycle ( ≤ 1%). The maximum continuous supply voltage is 26V. FEEDBACK SENSE Q15A OUT Q24 Q26 R27 V TAP R28 R18 20k Ω Q25 Q23 Q22 R15 100 k Ω R16 30 k Ω Q29 Q28 R17 10 Ω R21 8 Ω R17 12 k Ω Q31 Q30 R23 60 k Ω SHDN R24 50 k Ω R22 150 k Ω Q21 Q19 C2 40 pF R14 350 k Ω Q14 R13 100 k Ω Q18 R12 110 k Ω Q20 Q9 Q15B Q8 Q7 R11 20.6 k Ω Q5 R8 31.4 k Ω R10 150 k Ω R9 27.8 k Ω Q11 Q12 Q13 R6 140 k Ω R5 180 k Ω R4 13 k Ω R3 50 k Ω Q2 C1 20 pF Q4 Q3 R11 18 k Ω Q6 Q1 10 R1 20 k Ω R2 50 k Ω Q41 R30 30 k Ω Q40 Q34 GND Q36 Q37 R25 2.8 k Ω Q38 ERROR R26 60 k Ω Q39 Q42 Q16 Q17 50 k Ω 10 k Ω IN DENOTES CONNECTION ON MIC2937A-xx AND MIC29371-xx VERSIONS ONLY Schematic Diagram |
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