LM2574MX-3.3/NOPB Supplementary Information

1. Basic Device Information

• Part Number: LM2574MX-3.3/NOPB
• Device Series: LM2574, LM2574HV SIMPLE SWITCHER® 0.5‑A Step‑Down Voltage Regulator
• Output Type: Fixed 3.3 V output
• Status: Active, Production
• RoHS Compliance: Yes
• Operating Temperature Range: −40 °C to 125 °C
• Marking: LM2574M‑3.3 P+

2. Package & Packaging Data

• Package Type: SOIC (NPA)
• Pin Count: 14 pins
• Package Quantity: 1000 units per reel
• Carrier: Large Tape and Reel (LARGE T&R)
• Lead Finish / Ball Material: SN
• Moisture Sensitivity Level (MSL): Level‑3, 260 °C peak reflow, 168 hr floor life

3. Tape & Reel Dimensions (Nominal)

• Reel Diameter (D): 330.0 mm
• Reel Width (W1): 16.4 mm
• Carrier Tape Overall Width (W): 16.0 mm
• Cavity Pitch (P1): 12.0 mm
• Cavity Length (A0): 10.9 mm
• Cavity Width (B0): 9.5 mm
• Cavity Height (K0): 3.2 mm
• Pin 1 Orientation Quadrant: Q1

4. Tape & Reel Box Dimensions (Nominal)

• Length: 356.0 mm
• Width: 356.0 mm
• Height: 36.0 mm

5. Key Electrical Characteristics (3.3‑V Version)

• Output Voltage (VOUT):
• Input Voltage (VIN): 4.75 V to 40 V (LM2574), up to 60 V for HV version
• Output Current: Up to 0.5 A
• Oscillator Frequency: Typ 52 kHz
• Efficiency: 72% at VIN = 12 V, IOUT = 0.5 A
• Feedback Voltage (Adjustable version reference): 1.23 V
• Shutdown Quiescent Current: Typ 50 μA

6. Protection & Features

• Cycle‑by‑cycle current limit
• Thermal shutdown protection
• TTL shutdown / low‑power standby mode
• Internal fixed‑frequency oscillator (52 kHz)
• Internal frequency compensation

7. Applications

• High‑efficiency step‑down (buck) regulator
• On‑card switching regulators
• Efficient preregulator for linear regulators
• Positive‑to‑negative converter (buck‑boost)

8. Reliability & Handling

• ESD Rating: HBM ±2000 V
• Junction Temperature Rating: −40 °C to 125 °C
• Thermal Resistance (SOIC 14‑pin):
• ESD Caution: Limited built‑in ESD protection; short leads or use conductive foam during storage/handling.