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Monolithic Power Systems Inc. MP1593DN-LF-P
- Part No.:
- MP1593DN-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP1593DN-LF-P.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,419
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Product details
Overview
MP1593DN-LF-P from Monolithic Power Systems is a 3A, 28V input, fixed-frequency (385kHz) current-mode synchronous step-down DC/DC converter with integrated 100mΩ high-side MOSFET and internal bootstrap circuitry. It delivers regulated output down to 1.22V across 4.75–28V input range, supports adjustable soft-start via external capacitor, and includes cycle-by-cycle over-current protection and thermal shutdown-used in flat-panel TV power rails and cigarette-lighter-powered portable electronics.
For engineers reviewing the MP1593DN-LF-P datasheet, MP1593DN-LF-P pinout, MP1593DN-LF-P application, or MP1593DN-LF-P equivalent, key selection criteria include its 3A continuous output capability, SOIC-8E exposed-pad thermal performance, 1.22V feedback reference accuracy, and compatibility with low-ESR ceramic output capacitors without requiring external Schottky catch diodes.
Technical Context
The MP1593DN-LF-P implements peak current-mode control with an internal transconductance error amplifier (800μA/V typ), 385kHz oscillator, and dedicated COMP pin for loop compensation. Its functional block includes a high-side N-MOSFET switch driven by a charge-pump bootstrap circuit (BS pin), enabling operation up to 95% efficiency at 3A load.
It features programmable soft-start (10ms with 0.1μF on SS pin), under-voltage lockout (4.05V rising threshold), and fault protection including cycle-by-cycle current limiting (6.2A typ) and thermal shutdown at 160°C. The device operates with ±1.5% output voltage regulation over line, load, and temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports compact 3.3V/3A or 5V/3A point-of-load designs without external heat sinking. |
| Input Voltage Range | 4.75V to 28V - enables direct integration into automotive (12V/24V), industrial, and adapter-powered systems. |
| Switching Frequency | 385kHz fixed - balances EMI performance and inductor size; allows use of 6.8–10μH inductors for 3.3V outputs. |
| Feedback Reference | 1.222V ±1.5% - sets output voltage via resistor divider; enables precise 1.22V–12V adjustment with <0.5% error over temperature. |
| High-Side RDS(on) | 100mΩ max - reduces conduction loss at full load; contributes to >90% efficiency at 2A with 12V input. |
| Shutdown Current | 20μA - minimizes battery drain in always-on or standby applications such as set-top boxes. |
| Thermal Shutdown | 160°C - protects die during overload or poor PCB thermal design; recovers automatically after cooldown. |
Pinout & Package
MP1593DN-LF-P is housed in an 8-pin SOIC package with exposed thermal pad (SOIC8E), compliant with JEDEC MS-012 BA variant. The exposed pad must be soldered to PCB ground plane for optimal thermal performance (θJA = 50°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BS | Bootstrap Supply Input | Connects 10nF+ capacitor between BS and SW to generate gate drive voltage > VIN for high-side MOSFET. |
| 2 IN | Main Power Input | Accepts 4.75–28V supply; requires local 10μF ceramic bypass capacitor to GND for noise suppression. |
| 3 SW | Switch Node Output | Drives external LC filter; connects to inductor and bootstrap capacitor; carries high di/dt switching current. |
| 4 GND | Power Ground | Primary return path; exposed pad must be connected to this pin and large copper pour for thermal dissipation. |
| 5 FB | Feedback Input | Senses output voltage via resistive divider; regulates output to 1.222V reference with ±1.5% tolerance. |
| 6 COMP | Compensation Node | Connects RC network to stabilize control loop; crossover frequency typically set to ~38kHz (1/10 × fSW). |
| 7 EN | Enable Control | Digital input: >2.5V enables regulator; <1.5V forces shutdown; includes 210mV UVLO hysteresis. |
| 8 SS | Soft-Start Control | Capacitor-to-GND sets ramp time (10ms with 0.1μF); disables soft-start if left floating. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated High-Side MOSFET | 100mΩ RDS(on) eliminates need for external switch and simplifies layout while maintaining 3A capability. |
| Stable with Ceramic Capacitors | Supports low-ESR ceramic output caps (e.g., 22μF ×2) without oscillation-reduces BOM count and board area. |
| Adjustable Soft-Start | External capacitor on SS pin controls startup inrush; prevents input voltage sag and output overshoot. |
| Cycle-by-Cycle Over-Current Protection | Monitors switch current every cycle; limits peak current to 6.2A typ-prevents damage during short-circuit events. |
| Thermal Shutdown with Auto-Recovery | Triggers at 160°C junction temperature and resumes operation after die cools below hysteresis threshold. |
Applications
| Flat Panel TV Power Rails | Battery-Powered Portable Devices |
|---|---|
|
Use Scenario: Generating stable 3.3V/5V rails from 12V or 24V main supply in LCD/LED TV backlights and logic boards. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated intermediate voltage with fast transient response to dynamic display load changes. Use Value: Achieves >92% efficiency at 2A load with 12V input, reducing thermal stress and eliminating need for heatsinks in space-constrained chassis. |
Use Scenario: Powering FPGA, microcontroller, or USB peripherals from 12V car cigarette lighter sockets. IC Role / Device Role / Timing Role: Step-down regulator providing clean, low-noise 3.3V supply with soft-start to avoid brownout during vehicle ignition. Use Value: 20μA shutdown current extends battery life in parked-state monitoring systems; wide 4.75–28V input tolerates engine cranking dips and alternator surges. |
| Set-Top Box Pre-Regulator | DVD/PVR Digital Board Supply |
|
Use Scenario: Converting unregulated 12V wall adapter output to 5V for downstream linear regulators feeding sensitive audio/video ICs. IC Role / Device Role / Timing Role: High-efficiency pre-regulator minimizing heat generation before low-noise LDOs, improving overall system PSRR. Use Value: Fixed 385kHz switching avoids audible noise in audio subsystems; 1.222V reference ensures tight 5.0V ±2% output when paired with 1% resistors. |
Use Scenario: Supplying 2.5V core voltage to DVD laser driver ICs and MPEG decoder SoCs in consumer media players. IC Role / Device Role / Timing Role: Compact, self-contained buck converter replacing discrete switcher solutions with fewer external components. Use Value: SOIC8E exposed pad enables 2.5W power dissipation at +85°C ambient-supports sustained 3A operation without derating in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2307DN-LF-Z | Higher 2.4MHz switching frequency; lower 2A output rating; same SOIC8E package and 1.22V reference. | Better suited for ultra-compact designs where small inductors (<2.2μH) are required, but not for 3A continuous loads. | Select MP2307DN-LF-Z only when board space is critical and peak load ≤2A; otherwise retain MP1593DN-LF-P for full 3A capability. |
| LM2678-5.0/NOPB | Fixed 5V output; external MOSFET required; 63kHz frequency; TO-220-5 package; no soft-start or thermal shutdown. | Requires additional components (MOSFET, diode, compensation) and larger PCB footprint; lacks modern protection features. | Choose LM2678-5.0/NOPB only for legacy 5V-only designs with existing thermal management infrastructure; MP1593DN-LF-P offers superior integration and safety. |
Compared with MP2307DN-LF-Z and LM2678-5.0/NOPB, MP1593DN-LF-P uniquely combines 3A continuous output, integrated high-side MOSFET, thermal shutdown, and soft-start in a thermally enhanced SOIC8E package-making it optimal for new designs requiring reliability, compactness, and full-feature integration.
Availability
MP1593DN-LF-P is available at Aetrix Electronics and suitable for flat panel TVs, battery-powered portable devices, set-top boxes, and DVD/PVR digital board supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP1593DN-LF-P includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, motion control, and automotive applications.
The MP1593 belongs to MPS's high-current monolithic buck converter product line, designed specifically for cost-sensitive, space-constrained industrial and consumer power systems needing robust 3A integration without external switches or complex compensation.
FAQ
What is the minimum input voltage for reliable operation of MP1593DN-LF-P?
The MP1593DN-LF-P has a guaranteed operating input range from 4.75V to 28V. Below 4.75V, under-voltage lockout activates and disables regulation. The UVLO rising threshold is 4.05V ±300mV, with 210mV hysteresis-ensuring stable startup after brownout recovery.
Can MP1593DN-LF-P operate without an external Schottky diode?
Yes. MP1593DN-LF-P integrates both high-side and low-side power switches in a synchronous buck topology. No external catch diode is required-unlike asynchronous converters. This improves efficiency by ~3–5% and eliminates diode-related BOM cost and layout complexity.
How is thermal performance affected by the exposed pad connection?
The SOIC8E package's exposed pad must be soldered to a solid GND copper pour. With proper PCB layout (4-layer, 2oz copper), θJA drops from 50°C/W to ~35°C/W. Failure to connect the pad increases junction temperature by >25°C at 3A load, risking premature thermal shutdown.
What output capacitor types are validated for stable operation?
MPS validates MP1593DN-LF-P with ceramic (e.g., 22μF ×2 X5R 6.3V), SP-CAP, and aluminum polymer capacitors. Ceramic is preferred for lowest ESR and smallest footprint; SP-CAP offers higher capacitance in same size; aluminum polymer suits high-ripple applications but requires C6 compensation capacitor.
Is the 385kHz switching frequency adjustable?
No. MP1593DN-LF-P uses a factory-trimmed internal oscillator fixed at 385kHz (±13%). Frequency cannot be adjusted externally. For variable-frequency designs, consider MPS's MP2315 or MPQ4470 families, which support external RT resistor programming.
Does MP1593DN-LF-P support forced PWM or power-save mode?
MP1593DN-LF-P operates exclusively in forced continuous conduction mode (CCM) at all loads. It does not feature pulse-skipping or burst-mode operation. This ensures constant switching frequency for predictable EMI filtering but results in reduced light-load efficiency compared to auto-mode ICs.
What is the maximum achievable output voltage accuracy?
With 1% feedback resistors and typical conditions, output voltage accuracy is ±2.5% (including 1.5% VFB tolerance, resistor ratio error, and load/line regulation). At 25°C, measured accuracy is typically ±1.2% for 3.3V output using 16.9kΩ/10kΩ divider.
MP1593DN-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 1.22V
- Voltage - Output (Max):
- 25.2V
- Current - Output:
- 3A
- Frequency - Switching:
- 385kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
MP1593DN-LF-P FAQ
1.How can I place an order for MP1593DN-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1593DN-LF-P on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MP1593DN-LF-P reliable?
The price and inventory of MP1593DN-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP1593DN-LF-P is usually 5 days.
3.What payment methods are accepted for MP1593DN-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1593DN-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1593DN-LF-P?
MP1593DN-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1593DN-LF-P order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MP1593DN-LF-P?
For technical support, including MP1593DN-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1593DN-LF-P requirements.
6.How does Aetrix verify that MP1593DN-LF-P is sourced from the original manufacturer or authorized distributors?
All MP1593DN-LF-P products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MP1593DN-LF-P meets industry standards.
7.What is the process for return or replacement of MP1593DN-LF-P?
All MP1593DN-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP1593DN-LF-P, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MP1593DN-LF-P part is unused and in its original packaging.
Return procedure for MP1593DN-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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