IL2576-XX IKSEMICON | Alldatasheet

Document overview

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Technical content

Features

  • 3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions
  • Adjustable Version Output Voltage Range, 1.23 to 37 V ±4% Maximum Over Line and Load Conditions
  • Guaranteed 3.0 A Output Current
  • Wide Input Voltage Range
  • Requires Only 4 External Components
  • 52 kHz Fixed Frequency Internal Oscillator
  • TTL Shutdown Capability, Low Power Standby Mode
  • High Efficiency
  • Uses Readily Available Standard Inductors
  • Thermal Shutdown and Current Limit Protection

Applications

  • Simple High–Efficiency Step–Down (Buck) Regulator
  • Efficient Pre–Regulator for Linear Regulators
  • On–Card Switching Regulators
  • Positive to Negative Converter (Buck–Boost)
  • Negative Step–Up Converters
  • Power Supply for Battery Chargers Rev. 02

(Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.) Rating Symbol Value Unit Operating Junction Temperature Range TJ –40 to +125 °C Supply Voltage Vin 40 V SYSTEM PARAMETERS [Note 1]

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, Vin = 12 V for the 3.3 V, 5.0 V, and Adjustable version, V in = 25 V for the 12 V version, and V in = 30 V for the 15 V version. I Load = 500 mA, T J = 25°C, for min/max values T J is the operating junction temperature range that applies [Note 2], unless otherwise noted.) Characteristics Symbol Min Max Unit IL2576–3.3 ([Note 1] Test Circuit Figure 3) Output Voltage Vout 3.234 3.366 V Output Voltage (6.0 V ≤Vin ≤40 V, 0.5 A ≤ILoad ≤3.0 A) TJ = 25°C TJ = –40 to +125°C Vout 3.168 3.135 3.432 3.465 V Efficiency (Vin = 12 V, ILoad = 3.0 A) η 65 - % IL2576–5 [Note 1] Output Voltage Vout 4.9 5.1 V Output Voltage (8.0 V ≤Vin ≤40 V, 0.5 A ≤ILoad ≤3.0 A) TJ = 25°C TJ = –40 to +125°C Vout 4.8 4.75 5.2 5.25 V Efficiency (Vin = 12 V, ILoad = 3.0 A) η 67 - % IL2576–12 [Note 1] Output Voltage Vout 11.76 12.24 V Output Voltage (15.0 V ≤Vin ≤40 V, 0.5 A ≤ILoad ≤3.0 A) TJ = 25°C TJ = –40 to +125°C Vout 11.52 11.4 12.48 12.6 V Efficiency (Vin = 12 V, ILoad = 3.0 A) η 78 - % IL2576–15 [Note 1] Output Voltage Vout 14.7 15.3 V Output Voltage (18 V ≤Vin ≤40 V, 0.5 A ≤ILoad ≤3.0 A) TJ = 25°C TJ = –40 to +125°C Vout 14.4 14.25 15.6 15.75 V Efficiency (Vin = 12 V, ILoad = 3.0 A) η 78 - % IL2576 ADJUSTABLE VERSION [Note 1] Feedback Voltage (Vin = 12 V, ILoad = 0.5 A, Vout = 5.0 V, TJ = 25°C) Vout 1.217 1.243 V Feedback Voltage (8.0 V ≤Vin ≤40 V, 0.5 A ≤ILoad ≤3.0 A, Vout = 5.0 V) TJ = 25°C TJ = –40 to +125°C Vout 1.193 1.18 1.267 1.28 V Efficiency (Vin = 12 V, ILoad = 3.0 A, Vout = 5.0 V) η 67 - % 1. External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the IL2576 is used as shown in the test circuit, system performance will be as shown in system parameters section . Rev. 02

  1. Tested junction temperature range for the IL2576: Tlow = –40°C Thigh = +125°C DEVICE PARAMETERS

(Unless otherwise specified, Vin = 12 V for the 3.3 V, 5.0 V, and Adjustable version, Vin = 25 V for the 12 V version, and Vin = 30 V for the 15 V version. ILoad = 500 mA, TJ = 25°C, for min/max values TJ is the operating junction temperature range that applies [Note 2], unless otherwise noted.) Characteristics Symbol Min Max Unit ALL OUTPUT VOLTAGE VERSIONS Feedback Bias Current (Vout = 5.0 V [Adjustable Version Only]) TJ = 25°C TJ = –40 to +125°C Ib 100 500 nA Oscillator Frequency [Note 3] TJ = 25°C TJ = –40 to +125°C fosc kHz Saturation Voltage (Iout = 3.0 A [Note 4]) TJ = 25°C TJ = –40 to +125°C Vsat 1.8 2.0 V Max Duty Cycle (“on”) [Note 5] DC 93 – % Current Limit (Peak Current [Notes 3 and 4]) TJ = 25°C TJ = –40 to +125°C ICL 4.2 3.5 6.9 7.5 A Output Leakage Current [Notes 6 and 7], TJ = 25°C Output = 0 V Output = –1.0 V IL 2.0 mA Quiescent Current [Note 6] TJ = 25°C TJ = –40 to +125°C IQ mA Standby Quiescent Current (ON/OFF Pin = 5.0 V (“off”)) TJ = 25°C Istby 200 uA ON/OFF Pin Logic Input Level Vout = 0 V TJ = 25°C TJ = –40 to +125°C Vout = Nominal Output Voltage TJ = 25°C TJ = –40 to +125°C VIH VIL 2.2 2.4 1.0 0.8 V ON/OFF Pin Input Current ON/OFF Pin = 5.0 V (“off”), TJ = 25°C ON/OFF Pin = 0 V (“on”), TJ = 25°C IIH IIL uA 3. The oscillator frequency reduces to approx imately 18 kHz in the event of an output short or an overload which causes the reg ulated output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average 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 output pin. 5. Feedback (Pin 4) removed from output and connected to 0 V. 6. Feedback (Pin 4) removed from output and connected to +12 V fo r the Adjustable, 3.3 V, and 5.0 V versions, and +25 V for the 12 V and 15 V versions, to force the output transistor “off”. 7. Vin = 40 V. Rev. 02

output ripple by a factor of 10 or more is included in this circuit. FIGURE 10. 1.2V to 55V Adjustable 3A Power Supply with Low Output Ripple A switching regulator topology in which a positive voltage is converted to a negative voltage without a transformer. Ratio of the output switch’s on-time to the oscillator period. The diode which provides a return path for the load current when the IL2576 switch is OFF. The proportion of input power actually delivered to the load.

Rev. 02

Rev. 02