MC33761 ON Semiconductor, MC33761 Datasheet
MC33761
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MC33761 Summary of contents
Page 1
... The absence of external bandgap capacitor unleashes the response time to a wake–up signal and makes it stay within 40 s (in repetitive mode), pushing the MC33761 as a natural candidate in portable applications. The MC33761 also hosts a novel architecture which prevents excessive undershoots when the regulator is the seat of fast transient bursts any bursting systems. Finally, with a static line regulation better than – ...
Page 2
... Current Limit Vout nom + 1 V, Output is brought to Vout nom – 0.3 V (all versions) (3) Voltage Slope should be Greater than 2 mV/ MC33761 Description A positive voltage up to 12V can be applied upon this pin. A 900mV level on this pin is sufficient to start the IC. A 150mV shuts it down. ...
Page 3
... F, I out = 50 mA 100 MHz m Output Rise Time (all versions) C out = out = 50 mA, 10% of Rising ON Signal to 90% of Nominal V out Thermal Shutdown Thermal Shutdown (all versions) (3) V out is brought to V out – 100 mV MC33761 Pin # Symbol Min 5 V out 2.462 5 V out 2 ...
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... IC operation, bias etc. When the LDO becomes loaded, this term is called the Ground current actually the difference between the input current (measured through the LDO input pin) and the output current. MC33761 DEFINITIONS Line Regulation The change in output voltage for a change in input voltage. ...
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... OUTPUT CURRENT (mA) Figure 3. Dropout versus Output Current 180 160 140 120 100 –40 –60 Figure 5. Dropout versus Temperature MC33761 Characterization Curves 185 – 180 175 170 165 80 100 –60 –40 –20 0 AMBIENT TEMPERATURE ( C) Figure 2. Quiescent Current versus 2 ...
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... The maximum dissipation the package can handle is given by max Jmax is limited to 125 C, then the MC33761 can up to dissipate up to 470mW @ 25 C. The power dissipated by the MC33761 can be calculated from the following formula: + Ptot V ...
Page 7
... The figure below gives an example of a layout where stray inductances/capacitances are minimized. This layout is the MC33761 Dropout MC33761 R1 On/Off 100 k basis for the MC33761 performance evaluation board. The BNC connectors give the user an easy and quick evaluation mean. http://onsemi.com 7 Charge Output + ...
Page 8
... The MC33761 cures this problem by implementing a clever design where the LDO detects the presence of the overshoot and forces the system to go back to steady–state as soon as possible, ready for the next shot. Figure 10 and 11 show how it positively improves the response time and decreases the negative peak voltage ...
Page 9
... Thanks to the lack of bypass capacitor the MC33761 is able to supply its downstream circuitry as soon as the OFF to ON signal appears standard LDO, the charging time of the external bypass capacitor hampers the response time. A simple solution consists in suppressing this bypass element but, unfortunately, the noise rises to an Figure 12. Repetitive start– ...
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... TYPICAL TRANSIENT RESPONSES Figure 13. Output is pulsed from 2mA to 80mA Figure 15. Load transient improvement effect MC33761 Figure 14. Discharge effects from 0 to 40mA Figure 16. Load transient improvement effect http://onsemi.com 10 ...
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... out + 200 C out = 1 150 100 RMS Noise mA – 100 kHz – 1 MHz 100 Figure 17. MC33761 Typical Noise Density Performance 0 –10 –20 –30 – –50 –60 – –80 –90 – ...
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... FINISH THICKNESS. MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL. MILLIMETERS INCHES DIM MIN MAX MIN MAX A 2.90 3.10 0.1142 0.1220 B 1.30 1.70 0.0512 0.0669 C 0.90 1.10 0.0354 0.0433 D 0.25 0.50 0.0098 0.0197 G 0.85 1.00 0.0335 0.0413 H 0.013 0.100 0.0005 0.0040 J 0.10 0.26 0.0040 0.0102 K 0.20 0.60 0.0079 0.0236 L 1.25 1.55 0.0493 0.0610 2.50 3.00 0.0985 0.1181 MC33761/D ...