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Monolithic Power Systems Inc. MP8725EL-LF-Z
- Part No.:
- MP8725EL-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-VFDFN Exposed Pad
- Datasheet:
-
MP8725EL-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 5A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,363
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Product details
Overview
MP8725EL-LF-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated 120mΩ high-side and 20mΩ low-side MOSFETs, delivering 5A continuous output current across 4.5V–21V input range, fixed 500kHz switching frequency, and adjustable 0.8V–output regulation-used in notebook I/O power rails requiring compact, high-efficiency point-of-load conversion.
For engineers reviewing the MP8725EL-LF-Z datasheet, MP8725EL-LF-Z pinout, MP8725EL-LF-Z application, or MP8725EL-LF-Z equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and protection behavior, and real-world application constraints for stable design-in.
Technical Context
The MP8725 operates in peak-current-mode control with internal compensation, enabling fast transient response and simplified loop stability without external Type-II/III networks. Its proprietary switching loss reduction technique and bootstrap-driven high-side gate driver support up to 90% duty cycle at VIN=21V/VOUT=1.2V.
It integrates a 5V VCC regulator powered from VIN, an open-drain Power Good (PG) indicator with 0.7×VFB/0.9×VFB thresholds and 20μs delay, and cycle-by-cycle over-current protection that latches off upon FB falling below 30% of regulation voltage during short-circuit events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 21V - supports wide industrial and computing supply rails including 5V, 12V, and 19V adapter inputs. |
| Output Current | 5A continuous - sustains full load without derating at TA ≤ +85°C with proper PCB copper area and thermal vias. |
| Switching Frequency | Fixed 500kHz ±15% - enables compact magnetics (e.g., 1.8–2.2μH) and balances EMI vs. efficiency trade-offs. |
| Feedback Reference | 805mV typical - sets output voltage via resistor divider; enables precise 0.8V–5V adjustment with <±1% initial accuracy. |
| HS/LS RDS(ON) | 120mΩ / 20mΩ - minimizes conduction loss at 5A, contributing to >90% efficiency at 12V→1.2V/5A. |
| Thermal Shutdown | 150°C junction - protects against sustained overload or poor heatsinking; auto-recovery at ~140°C. |
| Enable Threshold | 1.3V typical rising, 0.4V hysteresis - ensures clean startup/shutdown with CMOS/TTL-compatible logic or resistive divider. |
| Power Good Delay | 20μs - provides stable output validation before system enable, preventing false sequencing faults. |
Pinout & Package
MP8725EL-LF-Z uses a thermally enhanced 3mm × 4mm, 14-pin QFN package with exposed thermal pad (Pin 10/NC). The package supports ≥2.6W continuous power dissipation at TA = +25°C (θJA = 48°C/W) when mounted on a 4-layer PCB per JESD51-7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Primary input supply rail | Connects to 4.5–21V source; requires local 22μF ceramic decoupling and low-inductance layout. |
| 2–5 SW | Switch node | High-current path to inductor; must use wide traces, multiple vias, and minimal loop area to reduce EMI. |
| 6 BST | Bootstrap capacitor connection | Forms floating gate drive for HS MOSFET; requires 0.1–1μF ceramic between BST and SW pins. |
| 7 EN/SYNC | Enable control & external clock input | Drives chip ON/OFF; accepts 300kHz–2MHz sync signal or resistive divider for automatic startup. |
| 8 FB | Feedback sensing input | Monitors output voltage via resistor divider; internal 805mV reference enables accurate regulation and fold-back during fault. |
| 9 PG | Power Good open-drain output | Signals valid regulation (high-Z when VFB > 0.9×VREF); sinks 4mA at 0.4V for external pull-up interface. |
| 11 VCC | Bias supply for internal circuitry | 5V regulated output from VIN; requires 0.1–0.22μF ceramic decoupling close to pin. |
| 12–13 GND | Power ground return | System ground reference for output; must be connected directly to large copper pour and tied to AGND at single point. |
| 14 AGND | Analog ground reference | Separate signal ground for FB/COMP; must be externally connected to GND on PCB to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Internal MOSFETs | Integrated 120mΩ HS / 20mΩ LS switches eliminate external FETs and drivers, reducing BOM count and board space. |
| Fixed-frequency current mode | 500kHz operation with peak-current sensing enables predictable EMI profile and simplified filter design. |
| Internal compensation | Eliminates need for external compensation network, reducing component count and layout sensitivity for stable 5A operation. |
| Sync capability | EN/SYNC pin accepts 300kHz–2MHz external clock, enabling system-level EMI synchronization across multiple rails. |
| OCP + thermal shutdown | Cycle-by-cycle current limit and 150°C junction shutdown provide robust fault protection without external circuitry. |
| Adjustable soft-start | Internally fixed 4ms ramp prevents output overshoot during startup, eliminating need for external SS capacitor. |
Applications
| Notebook I/O Power | Networking System Rails |
|---|---|
Use Scenario: Providing 1.2V/5A core I/O voltage in ultrabook platforms with tight thermal and space constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator managing CPU/GPU I/O domain power with fast load-step response. Use Value: Delivers >92% efficiency at 12V→1.2V/5A, minimizing heat generation in thin-profile chassis while supporting dynamic power states. | Use Scenario: Generating 3.3V/5A auxiliary supply for Ethernet PHYs and switch fabric controllers in enterprise routers. IC Role / Device Role / Timing Role: High-current POL converter synchronized to system clock to suppress conducted EMI in dense backplane environments. Use Value: Sync capability allows alignment with 1.25MHz system clock, reducing beat frequencies and easing EMC certification. |
| Digital Set-Top Box SoC Core | Flat Panel Display Logic Supply |
Use Scenario: Delivering 1.05V/5A to ARM-based media processor cores in low-cost STB designs. IC Role / Device Role / Timing Role: Main SoC core rail regulator with latch-off OCP to survive HDMI hot-plug transients and ESD events. Use Value: Latch-off protection prevents brownout-induced firmware corruption during cable insertion, improving field reliability. | Use Scenario: Powering timing controller (TCON) and scaler ICs in 4K LCD panels requiring clean 1.8V/5A logic rail. IC Role / Device Role / Timing Role: Low-noise buck converter with internal compensation and PG signaling for display power sequencing. Use Value: Open-drain PG output enables safe TCON enable after stable 1.8V is established, preventing display initialization errors. |
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 |
|---|---|---|---|
| MP2329DJ-LF-Z | Higher 6A rating, 2.5–18V input, 650kHz fSW, smaller 2mm×2mm QFN8 package | Targets space-constrained IoT edge nodes; lacks SYNC pin and PG output | Select when board area is critical and 6A headroom is needed, but system-level clock sync is unnecessary. |
| RT7295BGJ8F | 5A, 4.5–18V, 500kHz, includes light-load DCM mode and better 12V→3.3V efficiency | Optimized for always-on consumer devices; no internal bootstrap diode support | Prefer for battery-backed systems needing ultra-low quiescent current (<30μA), where light-load efficiency dominates. |
Compared with MP8725EL-LF-Z, MP2329DJ-LF-Z offers higher current and smaller footprint but sacrifices PG signaling and frequency synchronization-critical for notebook power sequencing and EMI control-while RT7295BGJ8F improves light-load efficiency at the cost of missing latch-off OCP and thermal hysteresis, reducing robustness in short-circuit-prone displays.
Availability
MP8725EL-LF-Z is available at Aetrix Electronics and suitable for notebook I/O power, networking system rails, digital set-top box SoC cores, and flat panel display logic supplies requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MP8725EL-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 mixed-signal ICs for power management, motion control, and automotive applications.
The MP8725 belongs to MPS's high-current synchronous buck converter product line, designed specifically for compact, efficient point-of-load conversion in space- and thermal-constrained computing and consumer electronics.
FAQ
What is the maximum recommended output current for MP8725EL-LF-Z at +85°C ambient?
The MP8725EL-LF-Z delivers 5A continuous output current up to +85°C ambient temperature when mounted on a 4-layer PCB with ≥2 oz copper, thermal vias under the exposed pad, and adequate airflow. Derating begins above +85°C due to thermal shutdown activation at 150°C junction temperature.
Can MP8725EL-LF-Z synchronize to an external clock, and what is the supported frequency range?
Yes, MP8725EL-LF-Z accepts external synchronization via the EN/SYNC pin across 300kHz to 2MHz. The internal clock aligns its rising edge to the external clock's rising edge within 2ms of startup, enabling deterministic EMI suppression in multi-rail systems.
Does MP8725EL-LF-Z require an external bootstrap diode for reliable operation?
No external bootstrap diode is required for standard operation. However, when duty cycle exceeds 65% (e.g., 21V→1.2V), adding an IN4148 diode from VCC to BST improves bootstrap capacitor charging efficiency and prevents high-side driver dropout.
How does the Power Good (PG) pin behave during startup and fault conditions?
PG asserts high-impedance when FB reaches 90% of VREF (e.g., 0.724V for 0.805V reference) and remains so until FB drops below 70% VREF (e.g., 0.564V). During short-circuit, PG pulls low within 20μs after FB falls below threshold, providing fast fault signaling to system controllers.
What is the purpose of separate AGND and GND pins, and how should they be connected?
AGND is the dedicated analog reference for FB and error amplifier circuits; GND is the power return path. They are not internally connected. On the PCB, AGND must be tied to GND at a single point near the IC to prevent noise coupling from high-current GND paths into sensitive feedback signals.
Is MP8725EL-LF-Z still recommended for new designs?
No-Monolithic Power Systems explicitly marks MP8725 as "NOT RECOMMENDED FOR NEW DESIGNS" and recommends MP2329 for new projects. MP8725 remains available for legacy support, but MP2329 offers improved specs, smaller package, and active lifecycle status.
MP8725EL-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 14-VFDFN Exposed Pad
- 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):
- 4.5V
- Voltage - Input (Max):
- 21V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 18.9V
- Current - Output:
- 5A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-QFN (3x4)
MP8725EL-LF-Z FAQ
1.How can I place an order for MP8725EL-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP8725EL-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 MP8725EL-LF-Z reliable?
The price and inventory of MP8725EL-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 MP8725EL-LF-Z is usually 5 days.
3.What payment methods are accepted for MP8725EL-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP8725EL-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP8725EL-LF-Z?
MP8725EL-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP8725EL-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 MP8725EL-LF-Z?
For technical support, including MP8725EL-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP8725EL-LF-Z requirements.
6.How does Aetrix verify that MP8725EL-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP8725EL-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 MP8725EL-LF-Z meets industry standards.
7.What is the process for return or replacement of MP8725EL-LF-Z?
All MP8725EL-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP8725EL-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 MP8725EL-LF-Z part is unused and in its original packaging.
Return procedure for MP8725EL-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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