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Monolithic Power Systems Inc. MP1492DS-LF-Z
- Part No.:
- MP1492DS-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP1492DS-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,489
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Product details
Overview
MP1492DS-LF-Z from Monolithic Power Systems is a fully integrated 2A 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 low-RDS(on) high-side (120 mΩ) and low-side (70 mΩ) MOSFETs, supports programmable switching frequency via external resistor, and delivers fast transient response for digital set-top boxes and flat-panel displays.
For engineers reviewing the MP1492DS-LF-Z datasheet, MP1492DS-LF-Z pinout, MP1492DS-LF-Z application, or MP1492DS-LF-Z equivalent, key selection criteria include its SOIC-8 package thermal resistance (θJA = 90°C/W), latch-off over-current protection mode, 1 ms soft-start timing, and bootstrap capacitor requirement on BST pin for high-side gate drive.
Technical Context
The MP1492DS-LF-Z employs adaptive COT control to achieve fast load-transient response without external compensation, using input voltage feed-forward to maintain stable on-time across 4.2–16V input range. Its internal power stage integrates matched HS/LS MOSFETs with RDS(on) of 120 mΩ/70 mΩ and incorporates shoot-through prevention via fixed dead-time.
Protection architecture includes cycle-by-cycle OCP with 50 μs hold-off timer, latch-off shutdown on sustained overcurrent or output short-circuit (triggered when VFB < 402.5 mV), thermal shutdown at 150°C with 25°C hysteresis, and input UVLO with 3.1V rising threshold and 300mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 16V - Supports wide industrial and consumer input rails including 5V, 12V, and 15V systems. |
| Output Current | 2A continuous - Sustains full rated load without derating at +25°C ambient in SOIC-8 package. |
| Feedback Reference | 805 mV ±16 mV - Sets precise output voltage via external resistor divider; enables 0.805V–13V adjustment. |
| Switching Frequency | Programmable via R7 - Configurable across typical 300–1000 kHz range; determined by R7 value and input voltage. |
| HS/LS RDS(on) | 120 mΩ / 70 mΩ - Minimizes conduction loss; enables >90% efficiency at mid-load in typical 12V→3.3V designs. |
| Soft-Start Time | 1 ms - Controls inrush current during power-up; prevents output overshoot and input rail sag. |
| OCP Mode | Latch-off - Requires power cycle recovery after overcurrent fault; ensures system-level safety in critical loads. |
| Thermal Shutdown | 150°C with 25°C hysteresis - Protects die under sustained overload; resumes operation only after junction cools to ~125°C. |
Pinout & Package
MP1492DS-LF-Z is housed in an 8-pin SOIC package (RoHS-compliant, lead-free, θJA = 90°C/W), optimized for surface-mount assembly and thermal performance on standard 4-layer PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Power Input | Accepts 4.2–16V supply; requires local ceramic decoupling (X5R/X7R) placed adjacent to pin. |
| 2 GND | System Ground | Reference node for FB, EN, and output regulation; must be low-impedance plane connection. |
| 3 SW | Switch Node | Drives external inductor; high di/dt path requiring wide trace and multiple vias to ground plane. |
| 4 BST | Bootstrap Supply | Connects to SW via 0.1 µF ceramic capacitor; powers high-side gate driver floating supply. |
| 5 BYP | Internal LDO Output | Provides regulated bias for internal circuitry; requires 1 µF X7R/X5R ceramic decoupling. |
| 6 EN | Enable Control | Active-high logic input (1.05–1.6V threshold); pull-up to VIN enables automatic start-up. |
| 7 FB | Voltage Feedback | Senses output via resistor divider; 10–50 nA input bias enables high-impedance divider design. |
| 8 FREQ | Frequency Set | Connects to IN via resistor R7 to program switching frequency; optional 1 nF capacitor reduces jitter. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive COT Control | Eliminates loop compensation components; maintains stability with low-ESR ceramic or high-ESR electrolytic output capacitors. |
| Integrated Power Stage | Reduces BOM count and layout area; eliminates need for external HS/LS MOSFETs and drivers. |
| Proprietary Switching Loss Reduction | Optimizes gate drive timing and dead-time to minimize overlap losses at high switching frequencies. |
| Comprehensive Protection Suite | Includes latch-off OCP, SCP, OVP (125% VREF), UVP (50% VREF), UVLO, and thermal shutdown with hysteresis. |
| Low Quiescent Current | 5 µA shutdown current and 1 mA quiescent current enable efficient operation in standby modes. |
Applications
| Digital Set-Top Box Power | Flat Panel Display Bias |
|---|---|
|
Use Scenario: Supplies core 1.2V/1.8V/3.3V rails to SoC, memory, and video processing ICs in cable/satellite STBs. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated, low-noise DC power with fast transient response to dynamic CPU/GPU loads. Use Value: Adaptive COT control maintains output regulation within ±1% during 0–2A load steps, eliminating need for large bulk capacitance. |
Use Scenario: Generates 5V/12V panel bias and 3.3V logic supply in LCD/LED TV and monitor main boards. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter stepping down 12V/15V system rail to display subsystem voltages. Use Value: Integrated 120 mΩ/70 mΩ MOSFETs sustain >92% peak efficiency at 1.5A, reducing thermal stress in space-constrained enclosures. |
| Distributed Power System | Industrial Embedded Controller |
|
Use Scenario: Provides isolated point-of-load (POL) conversion in multi-rail telecom or networking equipment backplanes. IC Role / Device Role / Timing Role: Secondary buck regulator downstream of isolated DC/DC module, delivering clean 2.5V/3.3V to FPGA or ASIC cores. Use Value: Programmable frequency via FREQ pin allows EMI optimization by shifting switching noise away from sensitive bands. |
Use Scenario: Powers ARM Cortex-M or RISC-V microcontrollers and peripheral interfaces in factory automation I/O modules. IC Role / Device Role / Timing Role: Main system regulator converting 12V field bus to 3.3V MCU rail with robust input UVLO and thermal protection. Use Value: Latch-off OCP and 150°C thermal shutdown ensure fail-safe behavior during wiring faults or overtemperature events. |
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 |
|---|---|---|---|
| MP1476DS-LF-Z | Same SOIC-8 package, 2A rating, but uses fixed-frequency PWM (not COT); higher quiescent current (2.5 mA vs. 1 mA). | Better suited for noise-sensitive audio or RF subsystems where deterministic switching frequency is required. | Select MP1476 if EMI filtering or clock synchronization is prioritized over transient response speed. |
| RT7297BGS | 2A, 4.5–18V input, COT control, but requires external bootstrap diode; no integrated BYP LDO output. | Higher board-level component count and layout complexity due to external bootstrap network and bias supply. | Choose RT7297BGS only if legacy design reuse or specific vendor qualification mandates Richtek sourcing. |
Compared with MP1492DS-LF-Z, MP1476DS-LF-Z trades transient performance for predictable EMI profile, while RT7297BGS increases design effort with external bootstrap and lacks integrated BYP regulation-making MP1492DS-LF-Z optimal for new compact, high-dynamic-load designs.
Availability
MP1492DS-LF-Z is available at Aetrix Electronics and suitable for digital set-top boxes, flat-panel television power supplies, and distributed power systems requiring stable component supply with full RoHS compliance and SOIC-8 thermal reliability.
Supply support for MP1492DS-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 MP1492 belongs to MPS's mainstream synchronous buck converter product line, engineered for cost-sensitive, space-constrained consumer and industrial applications demanding high efficiency, fast transient response, and minimal external components.
FAQ
What is the recommended input capacitor configuration for MP1492DS-LF-Z?
Use a minimum 10 µF X5R or X7R ceramic capacitor placed directly between IN and GND pins, with additional bulk capacitance (e.g., 47–100 µF aluminum polymer) if input ripple exceeds 50 mV. Layout requires short, wide traces and multiple vias to ground plane to handle high di/dt currents.
Does MP1492DS-LF-Z require an external ramp circuit for ceramic output capacitors?
Yes - when using low-ESR ceramic output capacitors, an external ramp (R4/C4 network) must be added to the FB pin to ensure stability in PWM mode. The ramp compensates for insufficient natural ESR-induced slope; design equations in the datasheet specify R4 and C4 values based on switching frequency and load conditions.
How does the latch-off OCP mode behave during a sustained short circuit?
Upon detecting inductor current exceeding 3.0 A for five consecutive cycles (with 50 µs hold-off timer), MP1492DS-LF-Z disables both MOSFETs and latches off. Recovery requires full power cycle - VIN must drop below UVLO threshold (≤2.8 V) and then rise above 3.1 V to restart soft-start sequence.
Can MP1492DS-LF-Z operate with an output voltage lower than 0.805V?
No - the internal reference is trimmed to 805 mV ±16 mV, and the feedback comparator architecture limits minimum regulated output to this value. Attempting sub-805 mV operation results in loss of regulation and uncontrolled dropout behavior.
What is the maximum allowable output capacitance for reliable soft-start?
Maximum recommended output capacitance is 470 µF. Larger values extend soft-start time beyond 1 ms, risk inrush current limiting, and may cause startup failure due to insufficient charge current from the internal SS generator - especially with high-ESR capacitors.
Is MP1492DS-LF-Z pin-compatible with MP1492DS-A-LF-Z?
Yes - both share identical SOIC-8 pinout and footprint. However, MP1492DS-A-LF-Z implements hiccup-mode OCP instead of latch-off, resulting in automatic retry behavior during overcurrent. Electrical and thermal specs are otherwise identical.
What thermal derating applies above +25°C ambient?
Derating begins at +25°C using θJA = 90°C/W: maximum continuous output current decreases linearly to zero at TJ = 150°C. At +60°C ambient, max output current is reduced to approximately 1.4 A assuming no PCB copper enhancement.
MP1492DS-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:
- 2A
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MP1492DS-LF-Z FAQ
1.How can I place an order for MP1492DS-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1492DS-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 MP1492DS-LF-Z reliable?
The price and inventory of MP1492DS-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 MP1492DS-LF-Z is usually 5 days.
3.What payment methods are accepted for MP1492DS-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1492DS-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1492DS-LF-Z?
MP1492DS-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1492DS-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 MP1492DS-LF-Z?
For technical support, including MP1492DS-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1492DS-LF-Z requirements.
6.How does Aetrix verify that MP1492DS-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP1492DS-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 MP1492DS-LF-Z meets industry standards.
7.What is the process for return or replacement of MP1492DS-LF-Z?
All MP1492DS-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1492DS-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 MP1492DS-LF-Z part is unused and in its original packaging.
Return procedure for MP1492DS-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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