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MIC29201-4.8BT Datasheet(PDF) 5 Page - Micrel Semiconductor |
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MIC29201-4.8BT Datasheet(HTML) 5 Page - Micrel Semiconductor |
5 / 12 page MIC2920A/29201/29202/29204 Micrel, Inc. February 2005 5 M9999-021505 Notes: General: Devices are ESD protected; however, handling precautions are recommended. 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. The junction to ambient thermal resistance of the MIC29204BM is 160°C/W mounted on a PC board. 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 100mV 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 MIC2920A 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 supply is the sum of the load current plus the ground pin current. Note 6: The MIC2920A 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 ≤ VOUT ≤ (VIN – 1 V), 4.3V ≤ VIN ≤ 26V, 1 mA < IL ≤400 mA, TJ ≤ 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. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = V OUT /VREF = (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: V SHUTDOWN ≥ 2V, VIN ≤ 26V,VOUT = 0, with Adjust pin tied to 5V Tap or to the R1, R2 junction (see Figure 3) with R1 ≥ 150kΩ. 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. A D J U S T S E N S E Q15A OUT Q24 Q26 R27 V TAP R28 R18 20kΩ Q25 Q23 Q22 R15 100 kΩ R16 30 kΩ Q29 Q28 R17 10 Ω R21 8 Ω R17 12 kΩ Q31 Q30 R23 60 kΩ SHDN R24 50 kΩ R22 150 kΩ Q21 Q19 C2 40 pF R14 350 kΩ Q14 R13 100 kΩ Q18 R12 110 kΩ Q20 Q9 Q15B Q8 Q7 R11 20.6 kΩ Q5 R8 31.4 kΩ R10 150 kΩ R9 27.8 kΩ Q11 Q12 Q13 R6 140 kΩ R5 180 kΩ R4 13 kΩ R3 50 kΩ Q2 C1 20 pF Q4 Q3 R11 18 kΩ Q6 Q1 10 R1 20 kΩ R2 50 kΩ Q41 R30 30 kΩ Q40 Q34 GND Q36 Q37 R25 2.8 kΩ Q38 E R R O R R26 60 kΩ Q39 Q42 Q16 Q17 50 kΩ 10 kΩ IN D ENO TES CO NNECTI O N O N MIC2920A-xx AND MIC29201-xx V ER SI O N S O N LY Schematic Diagram |
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