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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Monolithic Power Systems Inc. MP8670DN-LF-Z

Name: MP8670DN-LF-Z
Brand: Monolithic Power Systems Inc.
SKU: MP8670DN-LF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP8670DN-LF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: DC DC Switching Controllers

Package:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Datasheet:: MP8670DN-LF-Z.pdf

Description:: IC REG CTRLR BUCK 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MP8670DN-LF-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated 50mΩ high-side MOSFET and external low-side gate driver, delivering 6A continuous output current across 4.5V–30V input range, fixed 420kHz switching frequency, and adjustable 0.8V reference output voltage - deployed in flat-panel TV power rails and broadband communication front-ends.

For engineers reviewing the MP8670DN-LF-Z datasheet, MP8670DN-LF-Z pinout, MP8670DN-LF-Z application, or MP8670DN-LF-Z equivalent, this page delivers verified electrical parameters, thermal performance limits, synchronizable frequency control up to 1.5MHz, cycle-by-cycle over-current protection, and SOIC8E package layout guidance - all confirmed against MP8670 Rev. 1.3.

Technical Context

The MP8670 operates in fixed-frequency peak-current-mode control with internal 0.8V reference and error amplifier driving COMP node for loop stability. Its architecture integrates a high-side MOSFET switch and a dedicated BG driver output for external synchronous rectification, enabling >95% efficiency at 6A load.

It features programmable UVLO (4.1V rising threshold), internal 5V VCC regulator powered from VIN, bootstrap capacitor charging via SW-BST path, and hiccup-mode short-circuit protection triggered when FB falls below 250mV - all coordinated through a single PWM comparator and R-S latch.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 30V - supports 5V, 12V, and 24V industrial bus rails without pre-regulation.
Continuous Output Current	6A - sustained delivery into thermally managed PCB layouts using exposed-pad SOIC8E package.
Switching Frequency	Fixed 420kHz - balances EMI control and inductor size; synchronizable from 300kHz to 1.5MHz via EN/SYNC pin.
Internal High-Side R_DS(on)	50mΩ - reduces conduction loss at full load; enables ≥95% efficiency at 12V_IN/3.3V_OUT/6A.
Feedback Reference Voltage	0.808V (typ) - sets output voltage via external resistor divider; ±2.5% tolerance over temperature.
Current Limit Threshold	8.0A (typ) - cycle-by-cycle protection prevents MOSFET failure during overload or short-circuit events.
Thermal Shutdown	150°C junction - automatic shutdown with 140°C hysteresis ensures safe recovery under sustained thermal stress.

Pinout & Package

MP8670DN-LF-Z is housed in an 8-pin SOIC package with exposed thermal pad (SOIC8E), optimized for surface-mount assembly and PCB-level heat dissipation (θ_JA = 50°C/W on 4-layer board).

Pin/Terminal	Circuit Role	Design Meaning
1 SW	Switch Node Output	Drives external inductor; connects to BST capacitor and low-side MOSFET source - carries high di/dt switching current.
2 BST	Bootstrap Supply	Provides floating gate drive voltage for high-side MOSFET; requires 0.1–1µF ceramic capacitor between BST and SW.
3 VCC	BG Driver Bias Supply	Internally regulated 5V rail powering gate driver; requires 1µF ceramic decoupling capacitor to GND.
4 BG	Low-Side Gate Driver Output	Sinks/source up to 1A peak to drive external synchronous MOSFET gate; RSINK = 1Ω, RSOURCE = 4Ω.
5 GND	Analog & Power Ground	Reference for FB, EN/SYNC, and VCC; must be isolated from high-current return paths to avoid noise coupling.
6 FB	Output Voltage Feedback	Monitors resistive divider output; regulates V_OUT to 0.808V; folds back frequency if V_FB < 250mV.
7 EN/SYNC	Enable & External Sync Input	Active-high enable; accepts 300kHz–1.5MHz external clock for EMI reduction and multi-rail synchronization.
8 IN	Main Input Supply	Accepts 4.5V–30V unregulated input; requires local 22µF X5R/X7R ceramic capacitor for ripple suppression.

Key Features

Feature	Design Value
Synchronizable switching frequency	Supports 300kHz–1.5MHz external clock injection via EN/SYNC pin - enables EMI compliance and multi-phase coordination.
Cycle-by-cycle over-current protection	Triggers per-switching-cycle current limit at 8A (typ), preventing MOSFET thermal runaway during transient faults.
Integrated 50mΩ high-side MOSFET	Reduces BOM count and conduction losses - eliminates need for external high-side switch in 6A applications.
Hiccup-mode short-circuit recovery	Enters periodic restart after FB drops below 250mV; limits average short-circuit current and die temperature rise.
Stable with low-ESR ceramic capacitors	Compensated for X5R/X7R output caps down to 10µF - avoids instability issues common with polymer or electrolytic alternatives.

Applications

Flat Panel Display Power

Digital Set-Top Box Rails

Use Scenario: Powering 3.3V logic and video processing ICs in LCD/LED TV main boards.

IC Role / Device Role / Timing Role: Primary buck converter supplying stable 3.3V rail with fast load transient response to video frame rate changes.

Use Value: Delivers 6A continuous current with <1% line/load regulation - maintains HDMI interface integrity and SoC core voltage stability.

Use Scenario: Generating 5V and 3.3V rails for MPEG decoder, tuner, and Ethernet PHY in cable/satellite STBs.

IC Role / Device Role / Timing Role: Synchronous step-down regulator with EN/SYNC pin synchronized to system clock to minimize spectral interference.

Use Value: Achieves >93% efficiency at 5A load while meeting FCC Class B conducted EMI limits via frequency synchronization.

Broadband Access Equipment

Industrial Video Recorders

Use Scenario: Powering PoE-powered DSLAM line cards and fiber ONT modules operating from 12V or 24V backplanes.

IC Role / Device Role / Timing Role: Input-flexible buck controller supporting wide VIN range and robust thermal shutdown for fanless enclosures.

Use Value: Maintains regulation across 4.5V–30V input with no derating - eliminates need for auxiliary LDOs in variable-input telecom systems.

Use Scenario: Supplying 12V-to-5V conversion for SATA HDD controllers and video encoding ASICs in DVR/NVR chassis.

IC Role / Device Role / Timing Role: High-current buck with hiccup-mode protection - sustains operation during HDD spin-up current surges without latch-off.

Use Value: Limits peak short-circuit current to <2A average during disk fault conditions - prevents system brownout and data corruption.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPQ8670GD-AEC1-P	Automotive-grade variant (AEC-Q100 Grade 1), same SOIC8E package but with extended -40°C to +125°C T_J and enhanced ESD robustness.	Qualified for automotive infotainment displays and ADAS camera power rails where ambient temperature exceeds 85°C.	Select when automotive qualification, higher junction temperature rating, or enhanced reliability testing is required.
MP8669DN-LF-Z	Lower 4A output rating, identical 420kHz frequency and pinout, but reduced R_DS(on) = 65mΩ and lower thermal dissipation capability.	Suitable for cost-sensitive 3.3V/2.5V logic rails in STB or PVR where peak current stays below 4A.	Choose only if design load remains ≤4A and thermal margin allows higher R_DS(on)-induced losses.

Compared with MP8670DN-LF-Z, MPQ8670GD-AEC1-P adds automotive qualification at no pinout or functional trade-off, while MP8669DN-LF-Z reduces current capability and thermal headroom - making MP8670DN-LF-Z optimal for industrial 6A applications requiring maximum efficiency and robust fault handling.

Availability

MP8670DN-LF-Z is available at Aetrix Electronics and suitable for flat panel television power supplies, broadband communications equipment, and digital set-top box designs requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP8670DN-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 MP8670 belongs to MPS's high-current synchronous buck converter product line, engineered for compact, efficient, and thermally robust DC/DC conversion in space-constrained consumer and industrial electronics.

FAQ

What is the minimum recommended input capacitance for MP8670DN-LF-Z at 6A output?

A 22µF X5R or X7R ceramic capacitor is specified for 6A applications to suppress input ripple and limit surge current. This value ensures impedance remains below source impedance at 420kHz, preventing high-frequency noise coupling into upstream rails.

Can MP8670DN-LF-Z operate without an external bootstrap diode?

Yes - the internal bootstrap circuit functions without an external diode for most duty cycles. An IN4148 diode is only recommended when V_OUT is 3.3V or 5V and duty cycle exceeds 65%, to improve BST capacitor recharge efficiency and reduce driver losses.

How does the MP8670 handle output short-circuit conditions?

Upon short circuit, FB voltage drops below 250mV, triggering frequency foldback and eventual hiccup mode. The device disables switching for ~10ms, then attempts restart - limiting average short-circuit current to <2A and preventing thermal damage.

Is the EN/SYNC pin compatible with CMOS or TTL logic levels?

The EN/SYNC pin accepts standard CMOS logic: low threshold is 0.4V max, high threshold is 1.2V min. It draws only 2µA at 2V, enabling direct interfacing with microcontrollers or FPGA GPIO without level-shifting.

What is the thermal resistance of the SOIC8E package under standard JEDEC 4-layer PCB conditions?

θ_JA is 50°C/W and θ_JC is 10°C/W when mounted on a JESD51-7 compliant 4-layer PCB with the exposed pad fully soldered to a thermal plane - enabling 2.5W continuous power dissipation at +25°C ambient.

Does MP8670DN-LF-Z require external compensation components?

No - the MP8670 uses an internally optimized compensation network tied to the COMP node. Only the external feedback resistor divider (R1/R2) and output capacitor are required; no external RC networks or type-II/III compensators are needed.

What is the purpose of the VCC pin, and how should it be decoupled?

VCC supplies bias to the BG driver and internal logic. It must be decoupled with a 1µF X5R/X7R ceramic capacitor placed within 2mm of the pin and connected directly to the GND pad - ensuring stable gate drive under high-current transients.

MP8670DN-LF-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Type:: Transistor Driver

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Number of Outputs:: 1

Output Phases:: 1

Voltage - Supply (Vcc/Vdd):: 4.5V ~ 30V

Frequency - Switching:: 420kHz

Duty Cycle (Max):: 90%

Synchronous Rectifier:: No

Clock Sync:: Yes

Serial Interfaces:: -

Control Features:: Enable

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOICE

MP8670DN-LF-Z FAQ

1.How can I place an order for MP8670DN-LF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP8670DN-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 MP8670DN-LF-Z reliable?

The price and inventory of MP8670DN-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 MP8670DN-LF-Z is usually 5 days.

3.What payment methods are accepted for MP8670DN-LF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP8670DN-LF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP8670DN-LF-Z?

MP8670DN-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP8670DN-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 MP8670DN-LF-Z?

For technical support, including MP8670DN-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP8670DN-LF-Z requirements.

6.How does Aetrix verify that MP8670DN-LF-Z is sourced from the original manufacturer or authorized distributors?

All MP8670DN-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 MP8670DN-LF-Z meets industry standards.

7.What is the process for return or replacement of MP8670DN-LF-Z?

All MP8670DN-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP8670DN-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 MP8670DN-LF-Z part is unused and in its original packaging.

Return procedure for MP8670DN-LF-Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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