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Monolithic Power Systems Inc. MP1493DS-LF-Z
- Part No.:
- MP1493DS-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP1493DS-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,988
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Product details
Overview
MP1493DS-LF-Z from Monolithic Power Systems is a fully integrated 3A synchronous step-down DC/DC converter with adaptive Constant-On-Time (COT) control, operating from 4.2V to 16V input and delivering adjustable output from 0.805V to 13V. It integrates high- and low-side MOSFETs (RDS(ON) = 120 mΩ / 60 mΩ), supports programmable switching frequency up to ~450 kHz, and delivers fast transient response for digital set-top boxes and flat-panel display power rails.
For engineers reviewing the MP1493DS-LF-Z datasheet, MP1493DS-LF-Z pinout, MP1493DS-LF-Z application, or MP1493DS-LF-Z equivalent, this device is selected for high-efficiency, low-component-count point-of-load regulation where fast load-step response, thermal robustness (150°C shutdown), and electrolytic-capacitor compatibility are required.
Technical Context
The MP1493DS-LF-Z employs adaptive COT control with input-voltage feedforward to maintain stable switching frequency across input voltage variations while enabling sub-250 ns minimum on-time and 130–150 ns minimum off-time. Its internal architecture integrates both power switches, bootstrap driver, and feedback comparator with 805 mV ±16 mV reference voltage.
Protection logic includes cycle-by-cycle over-current detection with 50 µs hold-off timer (latch-off mode), input UVLO (3.1 V rising threshold), output OVP (125% VREF) and UVP (50% VREF), plus non-latching thermal shutdown at 150°C with 25°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2 V to 16 V - Supports wide industrial and consumer input rails including 5 V, 12 V, and 15 V systems without external regulators. |
| Output Current | 3 A continuous - Delivers full rated current without derating at +85°C ambient in SOIC-8 package with proper PCB copper area. |
| Feedback Reference | 805 mV ±16 mV - Enables precise output voltage setting down to 0.805 V with standard resistor dividers; determines regulation accuracy under load/line changes. |
| Switching Frequency | Programmable via R7 - Configurable from ~350 kHz to ~450 kHz (e.g., 500 kHz typical with R7 = 453 kΩ); balances EMI, efficiency, and LC size trade-offs. |
| HS/LS RDS(ON) | 120 mΩ / 60 mΩ - Low conduction loss enables >92% peak efficiency at 12 VIN/3.3 VOUT, reducing thermal stress and eliminating need for external MOSFETs. |
| OCP Mode | Latch-off (MP1493DS variant) - Halts switching permanently upon sustained overcurrent; requires EN toggle or power cycle to recover - suited for fault-isolation-critical systems. |
| Thermal Shutdown | 150°C with 25°C hysteresis - Protects die during overload or poor heatsinking; automatic restart occurs only after junction cools to ~125°C. |
Pinout & Package
MP1493DS-LF-Z is housed in an 8-pin SOIC package (RoHS-compliant, lead-free, JEDEC MS-012AC). The exposed pad is not electrically connected; thermal performance relies on PCB copper area under the package body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Power Input | Accepts 4.2–16 V supply; requires local 10 µF ceramic decoupling capacitor placed adjacent to pin with short, wide traces. |
| 2 GND | System Ground Reference | Return path for FB, EN, BYP, and power stage; must be connected to low-impedance ground plane to avoid regulation error or instability. |
| 3 SW | Switch Node | Drives external inductor; carries high di/dt square wave; requires minimum trace width and multiple vias to minimize EMI and voltage ringing. |
| 4 BST | Bootstrap Supply | Connects to SW via 0.1 µF ceramic capacitor; powers high-side gate driver; improper layout causes HS-FET failure or startup issues. |
| 5 BYP | Internal LDO Output | Provides regulated bias for internal circuitry; requires 1 µF X7R/X5R ceramic capacitor to GND; sensitive to ESR and placement. |
| 6 EN | Enable Control | Active-high logic input (1.05–1.6 V threshold); pull-up to VIN enables auto-start; driven low disables regulator with 5 µA shutdown current. |
| 7 FB | Voltage Feedback | Monitors output via resistor divider; 805 mV reference sets VOUT = 0.805 × (1 + R1/R2); high-impedance node requiring guard ring and noise-free routing. |
| 8 FREQ | Frequency Set | Connects to VIN through resistor R7 to program switching frequency; optional 1 nF capacitor improves jitter immunity in noisy environments. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive COT Control | Eliminates external compensation network; achieves <10 µs load-step response with 0.805 V reference and no phase-margin tuning required. |
| Integrated Power MOSFETs | HS/LS RDS(ON) of 120/60 mΩ reduces BOM count by two discrete FETs and associated gate drivers; enables compact 2-layer PCB designs. |
| Low Quiescent Current | 1 mA operating IQ and 5 µA shutdown current extend battery life in always-on auxiliary rails and enable energy-efficient standby modes. |
| Robust Protection Suite | Includes latch-off OCP, input UVLO, output OVP/UVP, and thermal shutdown - all internally implemented with no external components needed. |
| Electrolytic-Capacitor Friendly | Stable with low-cost aluminum or POSCAP output capacitors (≥12 mΩ ESR); avoids mandatory ceramic-only requirement and simplifies cost-sensitive designs. |
Applications
| Digital Set-Top Box Power | Flat Panel Display Bias Rail |
|---|---|
|
Use Scenario: Powers SoC core voltage (1.0–1.2 V) and memory interface rails in cable/satellite STBs with dynamic CPU load bursts. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 3 A peak current with <10 µs transient recovery to maintain SoC stability during channel-change interrupts. Use Value: Adaptive COT ensures no output droop during 2 A load steps; integrated FETs eliminate gate-drive timing skew and reduce layout sensitivity. |
Use Scenario: Generates 5 V or 12 V bias for LCD panel source/gate drivers in commercial monitors and TVs. IC Role / Device Role / Timing Role: Secondary buck converter stepping down 15 V intermediate rail to stable panel supply; operates in CCM with fixed ~400 kHz switching. Use Value: Programmable frequency avoids audible noise in panel transformers; latch-off OCP prevents damage during driver short-circuit faults. |
| Distributed Power System | Industrial Embedded Controller |
|
Use Scenario: Provides isolated 3.3 V or 5 V local regulation from 12 V backplane in modular PLC I/O modules. IC Role / Device Role / Timing Role: Point-of-load regulator with EN-controlled sequencing; supports hot-swap insertion via controlled soft-start ramp. Use Value: 1 ms soft-start prevents inrush current on shared bus; thermal shutdown protects against enclosure overheating in sealed enclosures. |
Use Scenario: Supplies FPGA I/O banks or microcontroller peripherals in factory automation controllers with wide ambient temperature range. IC Role / Device Role / Timing Role: Main 3.3 V/2.5 V regulator operating from 12 V field supply; withstands 4.2 V brownout and 16 V surge conditions. Use Value: 4.2–16 V input range eliminates need for pre-regulator; -40°C to +85°C rating matches industrial temperature requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1477DS-LF-Z | Successor device with improved efficiency (up to 95%), lower quiescent current (0.6 mA), and extended input range (4.5–18 V). | Recommended for new designs; supports higher VIN transients and tighter output regulation (±1% vs ±1.5%). | Select MP1477 if designing new products - MP1493 is marked "Not Recommended for New Designs" per MPS documentation. |
| TPS54331DR | TI part using voltage-mode PWM control; requires external compensation; 3 A rating but higher RDS(ON) (110/70 mΩ typical) and no adaptive COT. | Better suited for designs requiring tight EMI control via fixed-frequency operation and external sync capability. | Choose TPS54331 when system-level EMI compliance mandates deterministic switching frequency or external clock synchronization. |
Compared with MP1493DS-LF-Z, MP1477DS-LF-Z offers higher efficiency and newer process technology but shares identical pinout and basic functionality; TPS54331DR provides design flexibility via external compensation at the cost of increased component count and slower transient response.
Availability
MP1493DS-LF-Z is available at Aetrix Electronics and suitable for digital set-top boxes, flat-panel display power supplies, and distributed industrial power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP1493DS-LF-Z 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 power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP1493 belongs to MPS's mainstream synchronous buck converter product line, engineered for cost-sensitive, high-volume consumer and industrial applications demanding integration, reliability, and ease of use without external loop compensation.
FAQ
What is the recommended input capacitor for MP1493DS-LF-Z?
A minimum 10 µF X7R or X5R ceramic capacitor placed directly at the IN pin is required for stable operation. For ripple current handling, select a capacitor rated for ≥1.5 A RMS; typical designs use parallel 10 µF + 2.2 µF ceramics. Avoid high-ESR tantalum or aluminum electrolytics at the input due to instability risk.
Can MP1493DS-LF-Z operate with ceramic output capacitors?
Yes, but external ramp compensation (R4/C4 network) is mandatory for stability with low-ESR ceramic capacitors. The ramp slope must satisfy equation 8 from the datasheet; typical values are R4 = 100 kΩ and C4 = 100 pF. Without it, subharmonic oscillation or jitter occurs in PWM mode.
What is the function of the BYP pin?
The BYP pin outputs a regulated ~5 V LDO voltage used to bias internal circuitry. It must be decoupled with a 1 µF X7R/X5R ceramic capacitor to GND, placed within 2 mm of the pin. Do not connect loads or feedback networks to BYP - it is not intended as a general-purpose supply.
How does the latch-off OCP mode behave during a short circuit?
When inductor current exceeds 4.0–5.0 A for 50 µs continuously, the MP1493DS-LF-Z latches off: HS-FET and LS-FET turn off, FB is disabled, and EN must be cycled low-high to reset. This prevents thermal runaway and allows safe fault isolation in safety-critical subsystems.
Is MP1493DS-LF-Z pin-compatible with MP1477DS-LF-Z?
Yes - MP1477DS-LF-Z is a direct drop-in replacement with identical SOIC-8 pinout, same EN/FB/BST/SW functions, and compatible external component values. Key improvements include lower IQ, higher efficiency, and extended input range, making migration straightforward.
What is the maximum recommended output capacitance?
Maximum output capacitance is limited by the 1 ms soft-start time. For a 3 A startup current, COUT must be ≤ 3.75 mF to reach target voltage within soft-start period. Exceeding this causes failed regulation; typical designs use 22–100 µF ceramic or 47–220 µF POSCAP with ≥12 mΩ ESR.
Does MP1493DS-LF-Z support external synchronization?
No - MP1493DS-LF-Z uses adaptive COT control and has no SYNC pin or external clock input. Switching frequency is set solely by the FREQ-to-IN resistor (R7); frequency variation is ±10% over line/load/temperature, with no provision for external clock injection or phase alignment.
MP1493DS-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.2V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.805V
- Voltage - Output (Max):
- 13V
- Current - Output:
- 3A
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MP1493DS-LF-Z FAQ
1.How can I place an order for MP1493DS-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1493DS-LF-Z 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 MP1493DS-LF-Z reliable?
The price and inventory of MP1493DS-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP1493DS-LF-Z is usually 5 days.
3.What payment methods are accepted for MP1493DS-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1493DS-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1493DS-LF-Z?
MP1493DS-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1493DS-LF-Z 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 MP1493DS-LF-Z?
For technical support, including MP1493DS-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1493DS-LF-Z requirements.
6.How does Aetrix verify that MP1493DS-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP1493DS-LF-Z 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 MP1493DS-LF-Z meets industry standards.
7.What is the process for return or replacement of MP1493DS-LF-Z?
All MP1493DS-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1493DS-LF-Z, 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 MP1493DS-LF-Z part is unused and in its original packaging.
Return procedure for MP1493DS-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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