LM4576R-5.0

3A, 300kHz, Step-Down Switching Regulator LM4576 FEATURES  3.3V, 5.0V, 12V, 15V and Adjustable Output Versions  Adjustable Version Output Voltage Range, 1.23V to 37V +/- 4% maximum over line and load conditions  Guaranteed 3A Output Current  Wide Input Voltage Range  Requires Only 4 External Components  300KHz Fixed Frequency Internal Oscillator  TTL Shutdown Capability, Low Power Standby Mode  Uses Readily Available Standard Inductors  Thermal Shutdown and Current Limit Protection  Moisture Sensitivity Level 3 for SMD packages SOP8-PP PKG TO-263-5L PKG TO-220-5L PKG APPLICATION  Simple High-Efficiency Step-Down(Buck) Regulator  On-Card Switching Regulators  Positive to Negative Converter ORDERING INFORMATION Device LM4576DP-X.X LM4576R-X.X LM4576T-X.X Marking LM4576-X.X LM4576-X.X LM4576-X.X Package SOP8-PP TO-263-5L TO-220-5L DESCRIPTION The LM4576 series of regulators are monolithic integrated circuits that provide all the active functional for a step-down (buck) switching regulator, capable of driving 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5.0V, 12V, 15V and an adjustable output versions. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, and a fixed-frequency oscillator. The LM4576 series operates at a switching frequency of 300KHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Some features include a guaranteed +/- 4% tolerance on output voltage under specified input voltage and output load conditions, and +/- 15% on the oscillator frequency. External shutdown is included, featuring typically 60uA standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions. The oscillator frequency is reduced 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. Mar. 2020 - R1.1 -1 - HTC 3A, 300kHz, Step-Down Switching Regulator LM4576 ORDERING INFORMATION VOUT ADJ 3.3V 5.0V 12V 15V Package Order No. Description Package Marking Status SOP8-PP LM4576DP-ADJ 3A, Adjustable, 300kHz, On/off LM4576-ADJ Active TO-263-5L LM4576R-ADJ 3A, Adjustable, 300kHz, On/off LM4576-ADJ Active TO-220-5L LM4576T-ADJ 3A, Adjustable, 300kHz, On/off LM4576-ADJ Active SOP8-PP LM4576DP-3.3 3A, Fixed, 300kHz, On/off LM4576-3.3 Contact Us TO-263-5L LM4576R-3.3 3A, Fixed, 300kHz, On/off LM4576-3.3 Contact Us TO-220-5L LM4576T-3.3 3A, Fixed, 300kHz, On/off LM4576-3.3 Contact Us SOP8-PP LM4576DP-5.0 3A, Fixed, 300kHz, On/off LM4576-5.0 Active TO-263-5L LM4576R-5.0 3A, Fixed, 300kHz, On/off LM4576-5.0 Active TO-220-5L LM4576T-5.0 3A, Fixed, 300kHz, On/off LM4576-5.0 Active SOP8-PP LM4576DP-12 3A, Fixed, 300kHz, On/off LM4576-12 Contact Us TO-263-5L LM4576R-12 3A, Fixed, 300kHz, On/off LM4576-12 Contact Us TO-220-5L LM4576T-12 3A, Fixed, 300kHz, On/off LM4576-12 Contact Us SOP8-PP LM4576DP-15 3A, Fixed, 300kHz, On/off LM4576-15 Contact Us TO-263-5L LM4576R-15 3A, Fixed, 300kHz, On/off LM4576-15 Contact Us TO-220-5L LM4576T-15 3A, Fixed, 300kHz, On/off LM4576-15 Contact Us Mar. 2020 - R1.1 -2 - HTC 3A, 300kHz, Step-Down Switching Regulator LM4576 PIN CONFIGURATION ON/OFF FEEDBACK GND VOUT VIN ON/OFF VIN 1 VOUT 2 FEEDBACK 3 ON/OFF FEEDBACK GND 8 N.C Exposed 7 N.C PAD 6 GND 4 VOUT VIN 5 N.C. SOP8-PP TO-220-5L TO-263-5L PIN DESCRIPTION Package Symbol TO-263-5L Description SOP8-PP TO-220-5L 1 1 VIN 2 2 VOUT 3 6 GND 4 3 FEEDBACK 5 4 ON/OFF - 5, 7, 8 N.C. This pin is the positive input supply for the LM4576 step– down switching regulator. In order to minimize voltage transients and to supply the switching currents needed by the regulator, a suitable input bypass capacitor must be present. (Cin in Figure 1). This is the emitter of the internal switch. The saturation voltage VSAT of this output switch is typically 1.4V. It should be kept in mind that the PCB area connected to this pin should be kept to a minimum in order to minimize coupling to sensitive circuitry. Circuit ground pin. See the information about the printed circuit board layout. This pin senses regulated output voltage to complete the feedback loop. The signal is divided by the internal resistor divider network R1, R2 and applied to the non–inverting input of the internal error amplifier. In the adjustable version of the LM4576 switching regulator this pin is the direct input of the error amplifier and the resistor network R1, R2 is connected externally to allow programming of the output voltage. It allows the switching regulator circuit to be shutdown using logic level signals, thus dropping the total input supply current to approximately 60uA. The threshold voltage is typically 1.4V. Applying a voltage above this value (up to +Vin) shuts the regulator off. If the voltage applied to this pin is lower than 1.4V or if this pin is left open, the regulator will be in the "on" condition No Connect. * Exposed Pad of SOP8-PP package should be externally connected to GND. Mar. 2020 - R1.1 -3 - HTC 3A, 300kHz, Step-Down Switching Regulator LM4576 TYPICAL APPLICATION (Fixed Output Voltage Versions) Figure 1. Block Diagram and Typical Application Mar. 2020 - R1.1 -4 - HTC 3A, 300kHz, Step-Down Switching Regulator LM4576 ABSOLUTE MAXIMUM RATINGS (Absolute Maximum Ratings indicate limits beyond which damage to the device may occur) Rating Symbol Value UNIT Maximum Supply Voltage VIN 45 V On/Off Pin Input Voltage VON/OFF -0.3V ≤ V ≤ +Vin V FB Pin Voltage VFB -0.3V ≤ V ≤ +Vin V Output Voltage to Ground (Steady-State) Power Dissipation SOP8-PP Thermal Resistance, Junction to Ambient Thermal Resistance, Junction to Case TO-263-5L Thermal Resistance, Junction to Ambient Thermal Resistance, Junction to Case TO-220-5L Thermal Resistance, Junction to Ambient Thermal Resistance, Junction to Case TO-220V-5L Thermal Resistance, Junction to Ambient Thermal Resistance, Junction to Case Storage Temperature Range Maximum Junction Temperature VOUT -0.8 V PD θJA θJC PD θJA θJC PD θJA θJC PD θJA θJC TSTG TJ Internally Limited Contact us Contact us Internally Limited 70 5 Internally Limited 65 5 Internally Limited 65 5 -65 to +150 150 W ℃/W ℃/W W ℃/W ℃/W W ℃/W ℃/W W ℃/W ℃/W ℃ ℃ OPERATING RATINGS (Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications, see the Electrical Characteristics.) Rating Symbol Value. Unit Operating Junction Temperature Range TJ -40 to +125 ℃ Maximum Supply Voltage VIN 40 V Output Current IOUT 3 A Mar. 2020 - R1.1 -5 - HTC 3A, 300kHz, Step-Down Switching Regulator LM4576 ELECTRICAL CHARACTERISTICS / System Parameters [Note 1] (Unless otherwise specified, VIN = 12V for the 3.3V, 5.0V, and Adjustable version, VIN = 25V for the 12V and 15V version. ILOAD = 500 mA. For typical values TJ = 25°C, for min/max values TJ is the operating junction temperature range that applies [Note 2], unless otherwise noted.) Characteristics Symbol Min TYP Max Unit LM4576-3.3 ([Note 1] Test Circuit Figure 2) Output Voltage (5.5V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A) TJ=25℃ TJ= -40℃ ~ +125℃ Efficiency (VIN=12V, ILOAD=3A) VOUT 3.168 3.135 - 3.3 73 3.432 3.465 - V LM4576-5.0 ([Note 1] Test Circuit Figure 2) Output Voltage (8V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A) TJ=25℃ TJ= -40℃ ~ +125℃ Efficiency (VIN=12V, ILOAD=3A) VOUT 4.800 4.750 - 5.0 75 5.200 5.250 - LM4576-12 ([Note 1] Test Circuit Figure 2) Output Voltage (15V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A) TJ=25℃ TJ= -40℃ ~ +125℃ Efficiency (VIN=15V, ILOAD=3A) VOUT 11.520 11.400 - 12 86 12.480 12.600 - LM4576-15 ([Note 1] Test Circuit Figure 2) Output Voltage (18V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A) TJ=25℃ TJ= -40℃ ~ +125℃ Efficiency (VIN=18V, ILOAD=3A) VOUT 14.400 14.250 - 15 86 15.600 15.750 - LM4576-ADJ ([Note 1] Test Circuit Figure 2) Feedback Voltage (8V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A, VOUT programmed for 5V) TJ=25℃ TJ= -40℃ ~ +125℃ Efficiency (VIN=12V, ILOAD=3A, VOUT=5V) VOUT 1.193 1.180 - 1.230 75 1.267 1.280 - η η η η η % V % V % V % V % 1. External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. 2. Tested junction temperature range for the LM4576 : TLOW = –40°C, THIGH = +125°C Mar. 2020 - R1.1 -6 - HTC 3A, 300kHz, Step-Down Switching Regulator LM4576 ELECTRICAL CHARACTERISTICS / Device Parameters (Unless otherwise specified, VIN = 12V for the 3.3V, 5.0V, and Adjustable version, VIN = 25V for the 12V and 15V version. ILOAD = 500 mA. For typical values TJ = 25°C, for min/max values TJ is the operating junction temperature range that applies [Note 2], unless otherwise noted.) Characteristics Symbol MIN. TYP. MAX. Unit Ib - 50 - 100 500 nA FOSC 255 230 300 - 345 370 KHz VSAT - 1.4 - 1.6 1.8 V D/C 93 98 - % ICL 4.0 3.5 5.7 - 6.9 7.5 A IL - 0.4 10 2 30 mA IQ - 5 10 ISTBY - 60 200 VIH 2.2 2.4 1.4 - - V VIL - 1.2 - 1.0 0.8 V IIH IIL - 12 0 30 10 µA All Output Voltage Versions Feedback Bias Current (VOUT=5.0V [Adjustable Version Only]) TJ=25℃ TJ= -40 to +125℃ Oscillator Frequency [Note 3] TJ=25℃ TJ= -40 to +125℃ Saturation Voltage (IOUT=3.0A [note 4]) TJ= 25℃ TJ= -40 to +125℃ Max Duty Cycle (“0”) [Note 5] Current Limit (Peak Current [Note 3 and 4]) TJ= 25℃ TJ= -40 to +125℃ Output Leakage Current [Note 6 and 7] Output = 0V Output = -0.8V Quiescent Current [Note 6] TJ= 25℃ Standby Quiescent Current (ON/OFF Pin = 5.0V ("off")) TJ=25℃ ON/OFF Pin Logic Input Level (VOUT=0V) TJ=25℃ TJ= -40 to +125℃ VOUT=Nominal Output Voltage TJ=25℃ TJ= -40 to +125℃ ON/OFF Pin Input Current ON/OFF Pin = 5.0V (Regulator OFF), TJ=25℃ ON/OFF Pin = 0V (Regulator ON), TJ=25℃ mA µA 3. The oscillator frequency reduces to approximately 75 KHz in the event of an output short or an overload which causes the regulated output voltage to drop approximately 40% from the nominal 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 sourcing current. No diode, inductor or capacitor connected to output. 5. Feedback pin removed from output and connected to 0V. 6. Feedback pin removed from output and connected to +12V for the Adjustable, 3.3V, and 5.0V versions, and +25V for the 12V and 15V version, to force the output transistor “off”. 7. Vin = 40V. Mar. 2020 - R1.1 -7 - HTC 3A, 300kHz, Step-Down Switching Regulator LM4576 TYPICAL PERFORMANCE CHARACTERISTICS T.B.D. Mar. 2020 - R1.1 -8 - HTC 3A, 300kHz, Step-Down Switching Regulator LM4576 REVISION NOTICE The description in this data sheet can be revised without any notice to describe its electrical characteristics properly. Mar. 2020 - R1.1 -9 - HTC