BETAOperating input4.5–28 V
Step-down switching converter
MP1584 Specifications
Review MP1584 electrical specifications, operating conditions and package details.
Key specifications
When the high-side switch turns off, the external Schottky diode provides a path for the inductor current. The output capacitor smooths the voltage while feedback adjusts the switching action.
Output range0.8–25 V · requires input headroom
Output-current class3 A · thermal limits apply
Operating junction−20–125 °C
Package details
MP1584EN-LF-Z · SOIC-8E
| Property | Details |
|---|---|
| Manufacturer | Monolithic Power Systems |
| Part number | MP1584EN-LF-Z |
| Package | SOIC-8E |
| Connections | 8 pins |
| Mounting | SMD |
| Lead pitch | 1.27 mm |
| Package code | SOIC-8E |
| Thermal reference | −20–85°C ambient; −20–125°C operating junction |
Operating envelope
MP1584EN · limits and test conditions
Manufacturer specifications 7 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Input supply | 4.5–28 V | Recommended operating range |
| Output adjustment | 0.8–25 V | Must remain below input with adequate headroom |
| Output-current class | 3 A | Limited by power components, temperature and layout |
| Operating junction | −20 to +125°C | Do not use shutdown temperature as an operating target |
| Ambient ordering range | −20 to +85°C | MP1584EN package reference |
| Package | SOIC-8E | Eight leads plus a grounded exposed pad |
| Lifecycle note | Not recommended for new designs | MPS identifies MP2338 as an alternative; it is not pin-compatible by assumption |
No specifications match. Try a parameter name or a unit.
Electrical table baseline is VIN = 12 V, VEN = 2.5 V, VCOMP = 1.4 V and TA = 25°C unless stated.
Electrical reference
Separate nominal behavior from guaranteed limits
Manufacturer specifications 9 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Feedback voltage | 0.776 / 0.800 / 0.824 V | Minimum / typical / maximum; 4.5 V < VIN < 28 V |
| High-side on resistance | 150 mΩ typical | BST − SW = 5 V |
| Current-limit threshold | 4.0 A minimum; 4.7 A typical | No maximum is stated here; not a 3 A output guarantee |
| UVLO rising threshold | 2.7 / 3.0 / 3.3 V | Internal threshold; operation still requires the specified input range |
| UVLO hysteresis | 0.35 V typical | Input undervoltage control |
| EN rising threshold | 1.35 / 1.50 / 1.65 V | EN hysteresis 0.30 V typical |
| No-load quiescent current | 100 µA typical; 125 µA maximum | FB = 0.9 V |
| Shutdown current | 12 µA typical; 20 µA maximum | EN = 0 V |
| Soft start | 1.5 ms | Design-guaranteed source value; FB from 0 to 0.8 V |
No specifications match. Try a parameter name or a unit.
Typical values do not establish worst-case performance.
Frequency and compensation
The example follows the 5 V compensation row
Manufacturer specifications 7 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Programmable frequency | 100 kHz–1.5 MHz | External resistor at FREQ |
| RFREQ relationship | RFREQ[kΩ] = 180000 / f[kHz]^1.1 | Approximate design equation |
| Example RFREQ | 200 kΩ | Approximately 485 kHz by the equation; nominal 500 kHz class |
| Example output inductor | 15 µH | Source table lists 15–22 µH for 5 V / 22 µF output |
| Example output capacitor | 22 µF low-ESR ceramic | Account for capacitance loss under DC bias |
| COMP series network | 100 kΩ and 150 pF to ground | Source 5 V compensation row |
| Extra COMP capacitor | Not fitted in this example | Evaluate separately for high-ESR output capacitors |
No specifications match. Try a parameter name or a unit.
Changing power-stage components can require a new loop-stability review.
12 V to nominal 5 V
Illustrative 1 A load · regulated bench input
Manufacturer specifications 10 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Input / output | 12 V / 4.984 V nominal | Before reference, resistor and regulation errors |
| Feedback divider | 52.3 kΩ upper; 10 kΩ lower | Use 1% resistors; nominal divider current 80 µA |
| Bootstrap capacitor | 100 nF | Between BST8 and SW1 |
| Input bypass | 10 µF, 50 V ceramic | Place close to VIN7 and the power return |
| Catch diode | 40 V Schottky, at least 3 A class | Cathode at SW; anode at GND; check losses and surge ratings |
| Output inductor | 15 µH, ≥4 A saturation rating for normal operation | Check RMS current and fault behavior separately |
| Output capacitor | 22 µF, 10 V ceramic | Effective capacitance and ESR matter |
| Example load | 5 Ω, at least 10 W | About 1 A and 5 W; resistor will dissipate heat |
| EN connection | Open | Fixed 12 V input example; do not tie EN to VIN |
| Ideal inductor ripple | About 0.39 A peak-to-peak at 500 kHz | 12 V input, 5 V output, 15 µH; continuous-conduction approximation |
No specifications match. Try a parameter name or a unit.
This is an engineering starting circuit, not a claim of tested converter hardware.
Layout and startup
Short power paths; quiet feedback
Manufacturer specifications 7 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Hot loop | Input bypass → VIN / switch → catch diode → return | Keep the switching-current loop compact |
| SW copper | Short connection to inductor and diode | Keep clear of FB and compensation traces |
| Exposed pad | Connect to ground copper | Thermal vias and solder stencil need assembly-specific review |
| Bootstrap loop | BST capacitor close to BST and SW | Do not connect this capacitor to ground |
| Light-load headroom | VIN − VOUT greater than 3 V | Source guidance for refreshing the floating bootstrap supply |
| High duty ratio / low input | Review external bootstrap diode guidance | Source recommends it when VOUT/VIN >65% or VIN <5 V |
| Feedback pickup | Sense the regulated output after the inductor | Keep the divider and COMP components close to the IC |
No specifications match. Try a parameter name or a unit.
The fixed 12 V-to-5 V example provides generous bootstrap headroom.
Heat and stress limits
Stress ratings are not normal operating conditions
Manufacturer specifications 7 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Junction-to-ambient reference | 50°C/W | JESD51-7 four-layer test board |
| Junction-to-case reference | 10°C/W | Source package metric |
| Thermal shutdown | 150°C typical | 15°C typical hysteresis |
| Input absolute maximum | 30 V | Normal operation limited to 28 V |
| BST relative to SW | −0.3 to +6 V | Absolute stress limits |
| Other control pins | −0.3 to +6 V | Includes EN; do not connect directly to a high input rail |
| Absolute junction / storage | 150°C / −65 to +150°C | Stress / storage ratings |
No specifications match. Try a parameter name or a unit.
Actual temperature depends on switching losses, diode and inductor losses, copper and airflow.
Package and footprint
MP1584EN-LF-Z · top-view numbering
Manufacturer specifications 7 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Nominal molded body | 3.9 × 4.9 mm | SOIC-8E; 1.27 mm lead pitch |
| Body height | 1.30–1.70 mm | Manufacturer mechanical drawing |
| Lead span | 5.80–6.20 mm | Across the two banks |
| Exposed pad | 2.26–2.56 × 3.15–3.45 mm | Underside metal; electrically GND |
| Outer lands | 1.60 × 0.61 mm | 5.40 mm row centers; 1.27 mm pitch |
| Exposed land | 2.62 × 3.51 mm | Same electrical pad number 5 as the GND lead |
| Surface mounting only | SOIC-8E | No through-hole version is presented |
No specifications match. Try a parameter name or a unit.
The original footprint is a starting land pattern; review mask, stencil, vias and assembly clearances.
Connections by function
Select a pin for its function, connection guidance and electrical notes.