LM2674LDX-3.3 National Semiconductor, LM2674LDX-3.3 Datasheet - Page 8

• Manufacturer Part Number: LM2674LDX-3.3
• Manufacturer: National Semiconductor

Specifications of LM2674LDX-3.3

• Dc To Dc Converter Type: Step Down
• Number Of Outputs: 1
• Pin Count: 16
• Input Voltage: 40V
• Output Voltage: 3.3V
• Switching Freq: 275KHz
• Output Current: 500mA
• Efficiency: 86%
• Package Type: LLP EP
• Output Type: Fixed
• Switching Regulator: Yes
• Mounting: Surface Mount
• Input Voltage (min): 8V
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Lead Free Status / Rohs Status: Not Compliant

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Typical Performance
Characteristics
A: V
B: Inductor Current, 0.2 A/div
C: Output Ripple Voltage, 50 mV/div AC-Coupled
A: Output Voltage, 100 mV/div, AC-Coupled.
B: Load Current: 100 mA to 500 mA Load Pulse
SW
Load Transient Response for Continuous Mode
Pin Voltage, 10 V/div.
L = 100 µH, C
L = 100 µH, C
Continuous Mode Switching Waveforms
V
IN
Horizontal Time Base: 50 µs/div
Horizontal Time Base: 1 µs/div
= 20V, V
V
IN
OUT
OUT
= 20V, V
OUT
= 100 µF, C
= 100 µF, C
(Circuit of Figure 2)
= 5V, I
OUT
LOAD
= 5V,
OUT
OUT
= 500 mA
ESR = 0.1Ω
ESR = 0.1Ω
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A: V
B: Inductor Current, 0.5 A/div
C: Output Ripple Voltage, 20 mV/div AC-Coupled
A: Output Voltage, 100 mV/div, AC-Coupled.
B: Load Current: 100 mA to 400 mA Load Pulse
SW
Load Transient Response for Discontinuous Mode
L = 15 µH, C
Pin Voltage, 10 V/div.
L = 47 µH, C
Discontinuous Mode Switching Waveforms
V
IN
Horizontal Time Base: 200 µs/div
Horizontal Time Base: 1 µs/div
= 20V, V
OUT
V
OUT
IN
= 68 µF (2x), C
= 20V, V
OUT
= 68 µF, C
= 5V, I
OUT
LOAD
OUT
= 5V,
OUT
ESR = 50 mΩ
= 300 mA
ESR = 25 mΩ
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