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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Monolithic Power Systems Inc. MP2905EK-LF-Z

Name: MP2905EK-LF-Z
Brand: Monolithic Power Systems Inc.
SKU: MP2905EK-LF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP2905EK-LF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Datasheet:: MP2905EK-LF-Z.pdf

Description:: IC REG BUCK ADJ 10MSOP

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Product details

Overview

MP2905EK-LF-Z from Monolithic Power Systems is a hysteretic voltage-mode synchronous step-down controller IC designed for high-current point-of-load regulation. It operates from 3V–28V input, regulates output from 0.6V to 0.9×VIN, supports 200–500kHz adjustable switching frequency, integrates internal 5V LDO (REF), and delivers fast transient response without loop compensation-used in motherboard and GPU power rails.

For engineers reviewing the MP2905EK-LF-Z datasheet, MP2905EK-LF-Z pinout, MP2905EK-LF-Z application, or MP2905EK-LF-Z equivalent, key selection criteria include its lossless peak current sensing via ILIM pin, hiccup-mode overcurrent protection, adaptive dead-time control (40ns), MSOP-10 thermal performance (θJA = 150°C/W), and pre-bias startup capability.

Technical Context

The MP2905EK-LF-Z implements a fixed-hysteresis voltage-mode control architecture where FB is compared against a ramped SS voltage with 20mV hysteresis, enabling instantaneous response to load transients without external compensation. Its internal 5V LDO (REF) powers all circuitry and remains functional across the full 3V–28V input range, though regulation degrades below 5V input.

Current limiting uses lossless high-side MOSFET V_DS sensing via an external resistor on ILIM pin with a precise 50µA internal current sink; fault recovery employs a 250nA SS-pulldown current to enforce ~10% duty cycle during hiccup mode. Thermal shutdown engages at 140°C (typ) with 20°C hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3V to 28V - supports wide industrial and computing supply rails including 5V, 12V, and 24V systems
Output Voltage Range	0.6V to 0.9×VIN - enables low-voltage CPU/GPU core regulation with input feedforward stability
Switching Frequency	200kHz to 500kHz - adjustable via feed-forward capacitor to balance efficiency, size, and EMI
Feedback Reference	0.59V ±7mV - tight DC accuracy ensures ±1.2% output regulation under full load and line variation
Gate Drive Outputs	HG/LG with 1.6Ω/1.1Ω sinking resistance - drives logic-level N-MOSFETs with adaptive 40ns dead time
Current Limit Sensing	50µA ILIM sink - sets peak current threshold via external resistor; no sense resistor or power loss required
Thermal Shutdown	140°C activation / 120°C release - protects die during sustained overload or poor PCB thermal design

Pinout & Package

MP2905EK-LF-Z is housed in a thermally enhanced 10-pin MSOP package (MSOP-10-EP) with exposed pad tied to GND for improved heat dissipation. Package dimensions: 3.0mm × 3.0mm × 1.0mm, pitch 0.5mm, lead coplanarity ≤0.1mm.

Pin/Terminal	Circuit Role	Design Meaning
1 FB	Feedback input	Senses regulated output via resistive divider; reference voltage = 0.59V; propagation delay <70ns
2 SS	Soft-start control	Capacitor-to-GND sets soft-start time; internal 84kΩ resistor and 250nA hiccup pulldown enable controlled ramp-up
3 REF	Internal 5V LDO output	Powers internal circuitry; requires ≥4.7µF ceramic bypass; drops linearly below 5V VIN
4 GND	Ground reference	Primary signal and power return; exposed pad must be soldered to PCB ground plane for thermal/EMI performance
5 LG	Low-side gate driver	Drives synchronous rectifier MOSFET; sinking resistance = 1.1Ω; minimum on-time = 100ns
6 BST	Bootstrap supply input	Connects 0.1µF capacitor to SW; internal BST regulator eliminates need for external Schottky diode
7 SW	Switch node	High dv/dt node connecting to external LC filter; requires short, low-inductance layout to minimize ringing
8 HG	High-side gate driver	Drives high-side N-MOSFET; sinking resistance = 1.6Ω; minimum on-time = 100ns
9 IN	Main power input	Supplies IC bias and switch drivers; requires local ceramic bypass; absolute max = +30V
10 ILIM	Current limit threshold	50µA current sink sets V_DS-based overcurrent trip; resistor range: 1kΩ–8kΩ

Key Features

Feature	Design Value
Hysteretic voltage-mode control	Eliminates need for external compensation network; achieves sub-µs transient response to 1A/µs load steps
Integrated 5V LDO (REF)	Enables operation down to 3V input without external bias rail; reduces BOM count and layout complexity
Lossless peak current sensing	Uses high-side MOSFET R_DS(on) as current sense element; avoids power loss and accuracy drift of shunt resistors
Hiccup-mode overcurrent protection	Disables switching and discharges SS with 250nA current during fault; auto-retries after cooling
Pre-bias startup support	Detains HG/LG toggling until SS > FB when output has pre-existing voltage; prevents reverse current flow

Applications

Motherboard VRM

PCIe Graphics Card

Use Scenario: Regulating 1.0V–1.2V core voltage for Intel/AMD desktop CPUs with up to 12A load.

IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-side/low-side MOSFET timing, current limit, and OVP.

Use Value: Hysteretic control maintains <±1.2% output accuracy across 0–12A load steps while minimizing output capacitance.

Use Scenario: Delivering 0.8V–1.1V GPU core power in discrete graphics cards with dynamic 0–25A load profiles.

IC Role / Device Role / Timing Role: High-frequency (≥350kHz) step-down controller coordinating dual-phase operation and adaptive dead-time.

Use Value: 40ns adaptive dead-time minimizes shoot-through losses; ILIM-based current sensing enables accurate per-phase current limiting.

Set-Top Box SoC Supply

Point-of-Load Server Module

Use Scenario: Generating 1.8V I/O and 1.0V DDR memory rails in compact consumer media devices.

IC Role / Device Role / Timing Role: Single-chip buck controller replacing multi-IC solutions; manages soft-start, UVLO, and thermal foldback.

Use Value: MSOP-10 footprint and integrated REF reduce board area by >30% vs. controller+LDO discrete designs.

Use Scenario: Providing isolated 0.9V core voltage to FPGA or ASIC in telecom/datacom line cards.

IC Role / Device Role / Timing Role: Robust PoL controller with hiccup-mode protection and pre-bias compatibility for hot-swap systems.

Use Value: 140°C thermal shutdown and 30V absolute max IN rating ensure reliability in unregulated 24V/48V intermediate bus environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2910EK-LF-Z	Wider 2.5V–30V input range; adds enable pin and tighter 0.6V ±0.5% FB reference	Better suited for low-input (2.5V) battery-powered systems; lacks MP2905's pre-bias startup	Select when input may dip below 3V or ±0.5% regulation is mandatory; avoid if pre-bias operation is required
RT8205AZSP	Voltage-mode PWM (not hysteretic); fixed 300kHz; requires external compensation; no integrated REF	Needs external 5V bias rail; slower transient response; higher component count	Choose only if legacy PWM design reuse is prioritized over efficiency/transient performance

Compared with MP2910EK-LF-Z, MP2905EK-LF-Z offers superior pre-bias startup and simpler layout but narrower input range; versus RT8205AZSP, it delivers faster transient response and lower BOM cost due to integrated REF and hysteretic architecture.

Availability

MP2905EK-LF-Z is available at Aetrix Electronics and suitable for motherboard VRMs, PCIe graphics card power supplies, and set-top box SoC rails requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.

Supply support for MP2905EK-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 distribution since 1997.

The MP2900 series targets high-efficiency, high-density DC/DC conversion for computing and communications infrastructure, emphasizing hysteretic control, integrated bias regulation, and robust protection features for demanding point-of-load applications.

FAQ

What is the minimum recommended input voltage for reliable operation?

The MP2905EK-LF-Z functions down to 3V input, but the internal REF LDO output drops linearly below 5V VIN. At 3V–5V input, REF falls to ~3V, reducing gate drive strength and potentially limiting maximum output current. For full-spec operation, ≥5V input is recommended.

How is the switching frequency set, and what tolerance should be expected?

Frequency is set by a feed-forward capacitor (C8) between FB and ground, calculated using the formula involving V_FB, hysteresis, and R_FB. The datasheet states ±30% deviation due to process and temperature variation; actual measured frequency at 12V/1.8V/12A is 350kHz ±15kHz.

Does MP2905EK-LF-Z support forced continuous conduction mode (FCCM)?

No. The MP2905EK-LF-Z operates exclusively in hysteretic mode with variable frequency and discontinuous conduction at light loads. It does not include a MODE pin or external control to force CCM; light-load efficiency relies on natural pulse-skipping behavior.

Can the ILIM pin be left floating or tied directly to GND?

No. ILIM must be connected to the high-side MOSFET drain through a resistor (1kΩ–8kΩ). Floating or grounding ILIM disables current limiting and risks catastrophic MOSFET failure during overload or short-circuit events. The 50µA internal sink requires a defined voltage drop to function.

What is the purpose of the BST capacitor, and what value is required?

The BST capacitor (0.1µF ceramic, X7R, rated ≥16V) forms a charge pump between BST and SW pins to generate gate drive voltage above VIN for the high-side N-MOSFET. It must be placed within 2mm of the IC with low-inductance traces; insufficient capacitance causes HG underdrive and shoot-through.

Is the MP2905EK-LF-Z compatible with ceramic output capacitors only?

No. It supports ceramic, tantalum, or low-ESR electrolytic output capacitors. With ceramic caps, ripple is capacitance-dominated; with tantalum/electrolytic, ESR dominates. For >10A outputs using high-ESR caps, a 10Ω/1µF RC filter from VOUT to FB is recommended to maintain stability.

How does the device behave during input undervoltage lockout (UVLO)?

UVLO monitors the internal REF voltage. When REF drops below 4.75V (typ), the device shuts down HG and LG, halting switching. Recovery occurs when REF rises above 5.0V (typ) with 350mV hysteresis, preventing oscillation near the threshold. No external UVLO pin is provided.

MP2905EK-LF-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 3V

Voltage - Input (Max):: 28V

Voltage - Output (Min/Fixed):: 0.6V

Voltage - Output (Max):: 25.2V

Current - Output:: -

Frequency - Switching:: 200kHz ~ 500kHz

Synchronous Rectifier:: Yes

Operating Temperature:: -20°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-MSOP

MP2905EK-LF-Z FAQ

1.How can I place an order for MP2905EK-LF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP2905EK-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 MP2905EK-LF-Z reliable?

The price and inventory of MP2905EK-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 MP2905EK-LF-Z is usually 5 days.

3.What payment methods are accepted for MP2905EK-LF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2905EK-LF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP2905EK-LF-Z?

MP2905EK-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP2905EK-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 MP2905EK-LF-Z?

For technical support, including MP2905EK-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2905EK-LF-Z requirements.

6.How does Aetrix verify that MP2905EK-LF-Z is sourced from the original manufacturer or authorized distributors?

All MP2905EK-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 MP2905EK-LF-Z meets industry standards.

7.What is the process for return or replacement of MP2905EK-LF-Z?

All MP2905EK-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2905EK-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 MP2905EK-LF-Z part is unused and in its original packaging.

Return procedure for MP2905EK-LF-Z:

1.Submit a request within 90 days.

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

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