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TC2574-3.3VPA Datasheet(PDF) 3 Page - TelCom Semiconductor, Inc |
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TC2574-3.3VPA Datasheet(HTML) 3 Page - TelCom Semiconductor, Inc |
3 / 25 page 3 TC2574 0.5A Step-Down Switching Regulator TC2574-1 1/6/00 ELECTRICAL CHARACTERISTICS: Unless otherwise specified, VIN = 12V for the 3.3V, 5.0V, and Adjustable version,VIN = 25V for the 12V version. ILOAD = 100mA. For typical values TJ = 25°C, for min/max values TJ is the operat- ing junction temperature range that applies (Note 2), unless otherwise noted. Symbol Parameter Test Conditions Min Typ Max Units TC2574-ADJUSTABLE VERSION [(Note 1) Test Circuit Figure 2] Ib Feedback Bias Current VOUT = 5.0V (Adjustable Version Only) nA TJ = 25°C — 25 100 TJ = –40°C to +125°C — — 200 fO Oscillator Frequency (Note 3) TJ = 25°C — 52 — kHz TJ = 0 to +125°C47 52 58 TJ = –40 to +125°C42 – 63 VSAT Saturation Voltage IOUT = 0.5 A, (Note 4) V TJ = 25°C — 1.0 1.2 TJ = –40 to +125°C — — 1.4 DC Max Duty Cycle (“on”) [Note 5] 93 98 — % ICL Current Limit Peak Current (Notes 3 and 4) A TJ = 25°C 0.7 1.0 1.6 TJ = –40 to +125°C 0.65 — 1.8 IL Output Leakage Current (Notes 6 and 7), TJ = 25°CmA Output = 0 V — 0.6 2.0 Output = – 1.0 V — 10 30 IQ Quiescent Current (Note 6) mA TJ = 25°C — 5.0 9.0 TJ = –40 to +125°C— — 11 ISTBY Standby Quiescent Current ON/OFF Pin = 5.0 V (“off”) µA TJ = 25°C — 60 200 TJ = –40 to +125°C — — 400 ON/OFF Pin Logic Input Level V VIH VOUT = 0V TJ = 25°C 2.2 1.4 — TJ = –40 to +125°C 2.4 — — VIL Nominal Output Voltage TJ = 25°C — 1.2 1.0 TJ = –40 to +125°C — — 0.8 ON/OFF Pin Input Current mA µA IIH ON/OFF Pin = 5.0V (“off”), TJ = 25°C — 15 30 IIL ON/OFF Pin Input Current mA µA ON/OFF Pin = 0 (“on”), TJ = 25°C — 0 5.0 NOTES: 1. External components such as the catch diode, inductor, input and output capacitors can affect the switching regulator system performance. When the TC2574 is used as shown in the Figure 2 test circuit, the system performance will be as shown in the system parameters section of the Electrical Characteristics. 2. Tested junction temperature range for the TC2574: TLOW = –40°C T high = +125°C 3. The oscillator frequency reduces to approximately 18kHz in the event of an output short or an overload which causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average power dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%. 4. Output (Pin 2) sourcing current. No diode, inductor or capacitor connected to the output pin. 5. Feedback (Pin 4) removed from output and connected to 0 V. 6. Feedback (Pin 4) removed from output and connected to 12V for the Adjustable, 3.3V, and 5.0V versions, and 25V for the 12V version, to force the output transistor OFF. 7. VIN = 40 V. |
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