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Monolithic Power Systems Inc. MP1593DN-LF
- Part No.:
- MP1593DN-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP1593DN-LF.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:2,006
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Product details
Overview
MP1593DN-LF from Monolithic Power Systems is a current-mode synchronous step-down DC/DC converter with integrated 100mΩ high-side MOSFET, delivering up to 3A continuous output current across 4.75V–28V input range, fixed 385kHz switching frequency, and adjustable 1.22V feedback reference-used in flat panel TV power rails and cigarette lighter-powered portable electronics.
For engineers reviewing the MP1593DN-LF datasheet, MP1593DN-LF pinout, MP1593DN-LF application, or MP1593DN-LF equivalent, key selection criteria include thermal shutdown threshold (160°C), cycle-by-cycle overcurrent protection (4.8–7.6A trip), soft-start programmability via external capacitor, and SOIC-8E exposed-pad package for enhanced thermal performance.
Technical Context
The MP1593DN-LF employs peak current-mode control with internal transconductance error amplifier (GEA = 500–1120 μA/V) and slope compensation, enabling fast transient response and stable loop behavior with ceramic output capacitors. Its bootstrap gate drive architecture uses an external SW-to-BS capacitor to enable high-side N-MOSFET operation above VIN.
Functional blocks include UVLO (4.05V rising threshold, 210mV hysteresis), EN pin logic with 2.5V enable threshold, and COMP node for full-loop compensation via RC network-supporting crossover frequencies up to ~38kHz for optimized stability across 1.22V–12V output configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports single-rail power delivery for mid-power embedded systems without external current boosting. |
| Input Voltage Range | 4.75V to 28V - accommodates 5V, 12V, and 24V industrial/battery inputs including automotive cigarette lighter (12V nominal) sources. |
| Switching Frequency | 385kHz (±13%) - enables compact magnetics (e.g., 10μH inductor) while avoiding AM radio band interference. |
| Feedback Reference | 1.222V ±2.9% - sets output voltage via resistor divider; allows precise 3.3V, 5V, or custom rail generation with <1% tolerance using 1% resistors. |
| Shutdown Current | 20μA - minimizes standby drain in battery-backed applications such as set-top boxes and portable DVD players. |
| Thermal Shutdown | 160°C junction - protects against sustained overload or poor PCB heatsinking; auto-recovery after cooldown. |
| Current Limit | 4.8A to 7.6A - provides robust short-circuit protection while allowing 3A continuous operation with margin for peak loads. |
Pinout & Package
MP1593DN-LF is housed in an 8-pin SOIC-8E package with exposed thermal pad (connected internally to GND, Pin 4). The exposed pad must be soldered to a PCB copper pour for effective thermal dissipation (θJA = 50°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BS | Bootstrap Supply Input | Drives high-side MOSFET gate; requires ≥10nF capacitor from BS to SW to sustain gate voltage above VIN during high-duty-cycle operation. |
| 2 IN | Main Power Input | Accepts 4.75–28V; must be bypassed with low-ESR ceramic capacitor (e.g., 10μF ×2) near IC to suppress switching noise. |
| 3 SW | Power Switch Node | Connects to inductor and bootstrap capacitor; carries high di/dt; layout critical to EMI and efficiency. |
| 4 GND | Power Ground / Exposed Pad | Primary return path for power and signal; exposed pad must be connected to solid ground plane for thermal and electrical integrity. |
| 5 FB | Feedback Input | Senses output voltage via resistive divider; 1.222V reference enables accurate regulation independent of load or line variation. |
| 6 COMP | Compensation Node | Output of transconductance error amplifier; connects to RC network for loop stabilization-crossover target ~38kHz. |
| 7 EN | Enable Control | Digital ON/OFF control; 2.5V threshold with 150mV hysteresis; supports UVLO extension via external resistor divider from IN. |
| 8 SS | Soft-Start Timing | Controls startup ramp time; 0.1μF to GND yields 10ms soft-start-reduces inrush current and input voltage sag. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100mΩ High-Side MOSFET | Eliminates need for external high-side switch and driver, reducing BOM count and PCB area in space-constrained designs. |
| Stable with Ceramic Output Capacitors | Supports low-ESR ceramic caps (e.g., 22μF ×2) without requiring tantalum or electrolytic types-improving reliability and lifetime. |
| Programmable Soft-Start | External capacitor on SS pin sets controlled output voltage ramp rate, preventing overshoot and limiting input surge current at power-up. |
| Cycle-by-Cycle Overcurrent Protection | Monitors switch current every cycle; limits peak current to 4.8–7.6A-enables safe operation under short-circuit or overload conditions. |
| Thermal Shutdown with Hysteresis | Shuts down at 160°C junction temperature and remains off until die cools by ~15°C-prevents thermal runaway during sustained overload. |
Applications
| Flat Panel TV Power Rails | Battery-Powered Portable Devices |
|---|---|
|
Use Scenario: Generating 3.3V/5V bias rails for LCD backlight drivers, HDMI receivers, and microcontrollers in 24V-input flat panel TVs. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24V bus to stable low-voltage rails; operates continuously at full 3A load with 95% efficiency at 12VIN. Use Value: High efficiency reduces heat buildup inside sealed TV enclosures; SOIC-8E exposed pad enables direct thermal coupling to metal chassis. |
Use Scenario: Powering FPGA I/O banks and USB peripherals in portable test equipment powered from 12V car cigarette lighter sockets. IC Role / Device Role / Timing Role: Pre-regulator stepping 12V down to 3.3V before LDO post-regulation; handles wide input transients (load dump, cold crank) via 28V abs max rating. Use Value: 4.75V UVLO ensures clean startup after engine cranking; 20μA shutdown current preserves battery life during device sleep mode. |
| Set-Top Box Main Supply | DVD/PVR Digital Board Power |
|
Use Scenario: Delivering 3.3V/2.5V to SoC, memory, and tuners in cable/satellite set-top boxes with 12V wall adapter input. IC Role / Device Role / Timing Role: Primary DC/DC converter operating at 385kHz; supplies regulated rail to downstream LDOs and digital ICs with tight load regulation. Use Value: Fast transient response (<10μs recovery) maintains voltage stability during burst-mode video decoding; soft-start prevents brownout on boot. |
Use Scenario: Providing 1.8V/2.5V core and I/O power to DVD laser servo controllers and MPEG decoders in consumer PVR units. IC Role / Device Role / Timing Role: Secondary buck stage following AC/DC adapter; configured for 1.8V output using 10kΩ/5.6kΩ feedback divider per datasheet Table 3. Use Value: COMP-based loop compensation supports stable operation with 47μF polymer output caps-reducing ripple below 20mVpp at 3A load. |
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 40V abs max input, 2A output, 500kHz fSW, same SOIC-8E package | Lower current capability; better suited for 2A applications with tighter space constraints and higher-frequency filtering needs | Select when input may exceed 28V or when higher switching frequency simplifies EMI filter design. |
| LM2678SD-3.3/NOPB | Fixed 3.3V output, 5A rating, 260kHz fSW, TO-263-5 package | Non-adjustable output; larger thermal footprint; lacks programmable soft-start and COMP-based compensation | Choose for drop-in 3.3V replacement where output voltage is fixed and PCB real estate permits D2PAK mounting. |
Compared with MP1593DN-LF, MP2307DN-LF-Z offers higher input voltage tolerance but reduced output current, while LM2678SD-3.3/NOPB trades flexibility (adjustable VOUT, soft-start, compensation) for simplicity and higher current in fixed-output use cases.
Availability
MP1593DN-LF is available at Aetrix Electronics and suitable for flat panel TV power rails, battery-powered portable devices, set-top box main supply, and DVD/PVR digital board power requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP1593DN-LF 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 interface applications.
The MP1593 belongs to MPS's high-efficiency DC/DC converter product line, designed specifically for cost-sensitive, space-constrained industrial and consumer applications requiring wide-input, adjustable-output, and thermally robust step-down regulation.
FAQ
What is the minimum input voltage required for reliable startup?
The MP1593DN-LF features under-voltage lockout with a rising threshold of 4.05V ±300mV. Reliable startup occurs only when VIN exceeds this threshold; operation below 4.75V is not guaranteed per datasheet specifications, and the regulator will remain in shutdown until the input rises above the UVLO threshold.
Can the MP1593DN-LF operate with a 3.3V output and 5V input?
Yes-the MP1593DN-LF supports input voltages as low as 4.75V and outputs down to 1.22V. For 3.3V output from 5V input, the duty cycle is ~66%, well within the 90% maximum limit. Ensure proper compensation (e.g., R3=5.6kΩ, C3=8.2nF per Table 3) and use low-ESR ceramic output capacitors for stability.
Is an external bootstrap diode required for optimal efficiency?
An external bootstrap diode (e.g., IN4148) is recommended only when VOUT = 3.3V or 5V *and* duty cycle exceeds 65% (i.e., VIN < 1.5×VOUT). It improves high-side gate drive efficiency by reducing BST capacitor discharge losses-particularly beneficial in 5V-input-to-3.3V-output configurations.
How does the COMP pin function in loop compensation?
The COMP pin is the output of the internal transconductance error amplifier. Connecting a series RC network from COMP to GND sets a dominant pole-zero pair to stabilize the current-mode control loop. Typical values (e.g., 5.6kΩ + 8.2nF for 3.3V output) yield ~38kHz crossover-balancing transient response and phase margin without requiring external op-amps.
What thermal derating applies above 85°C ambient?
The MP1593DN-LF is rated for operation up to +125°C junction temperature. With θJA = 50°C/W on a 4-layer PCB, continuous 3A output is sustainable up to ~85°C ambient. Above that, output current must be reduced linearly: e.g., at 100°C ambient, max continuous current drops to ~2.2A to maintain TJ ≤ 125°C.
Does the MP1593DN-LF support forced PWM or skip-mode operation?
No-the MP1593DN-LF operates exclusively in peak current-mode PWM with fixed 385kHz frequency. It does not feature pulse-skipping, burst-mode, or frequency modulation for light-load efficiency improvement. Light-load efficiency is maintained via low 20μA shutdown current and optimized gate drive, not operational mode switching.
What is the purpose of the exposed thermal pad on the SOIC-8E package?
The exposed pad on the MP1593DN-LF's SOIC-8E package is electrically connected to Pin 4 (GND) and serves as the primary thermal conduction path. Soldering it to a dedicated PCB ground plane significantly lowers θJA (from ~80°C/W to 50°C/W), enabling higher continuous output current and improved long-term reliability under thermal stress.
MP1593DN-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tube
- 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:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MP1593DN-LF FAQ
1.How can I place an order for MP1593DN-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1593DN-LF 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 reliable?
The price and inventory of MP1593DN-LF 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 is usually 5 days.
3.What payment methods are accepted for MP1593DN-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1593DN-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1593DN-LF?
MP1593DN-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1593DN-LF 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?
For technical support, including MP1593DN-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1593DN-LF requirements.
6.How does Aetrix verify that MP1593DN-LF is sourced from the original manufacturer or authorized distributors?
All MP1593DN-LF 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 meets industry standards.
7.What is the process for return or replacement of MP1593DN-LF?
All MP1593DN-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP1593DN-LF, 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 part is unused and in its original packaging.
Return procedure for MP1593DN-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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