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Monolithic Power Systems Inc. MP2309DS-LF-Z
- Part No.:
- MP2309DS-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP2309DS-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,388
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Product details
Overview
MP2309DS-LF-Z from Monolithic Power Systems is a synchronous buck DC-DC converter IC delivering 1A continuous output current, operating from 4.75V to 23V input, with fixed 340kHz switching frequency and adjustable output voltage (0.923V–20V). It integrates dual 140mΩ N-channel MOSFETs and features cycle-by-cycle overcurrent protection, programmable soft-start, and 1μA shutdown quiescent current - deployed in FPGA/DSP power supplies and notebook computers.
For engineers reviewing the MP2309DS-LF-Z datasheet, MP2309DS-LF-Z pinout, MP2309DS-LF-Z application, or MP2309DS-LF-Z equivalent, key selection criteria include input voltage range compatibility, integrated MOSFET RDS(ON), feedback reference accuracy (0.923V ±2.5%), thermal shutdown threshold (160°C), and SOIC8 package suitability for board space-constrained designs.
Technical Context
The MP2309DS-LF-Z implements current-mode control with an internal transconductance error amplifier (GEA = 800 μA/V) and COMP-pin-based loop compensation. Its functional block includes a 340kHz oscillator, high-side/low-side gate drivers, and a 0.923V precision feedback reference with overvoltage protection at 1.1V.
It uses bootstrap charging (via BS–SW capacitor) to drive the high-side MOSFET, requires no external Schottky diode for basic operation (though optional for efficiency gains), and incorporates input UVLO (4.10V typ.) with 210mV hysteresis and EN pin logic thresholds (1.5V rising, 2.5V lockout).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.75V to 23V - supports wide industrial and computing input rails including 5V, 12V, and 19V adapters. |
| Output Current | 1A continuous - sufficient for powering single-core FPGAs, low-power DSPs, or I/O rails in portable systems. |
| Switching Frequency | Fixed 340kHz - enables predictable EMI filtering and compact LC filter design with standard 10μH inductors. |
| Feedback Reference | 0.923V ±2.5% - sets output voltage via resistor divider; enables accurate 3.3V, 5V, or 12V regulation with <1% error. |
| Shutdown Current | 1μA - minimizes battery drain in always-on subsystems or standby modes of embedded devices. |
| Thermal Shutdown | 160°C - protects die during overload or poor PCB thermal layout; auto-recovery on cooldown. |
| Efficiency | Up to 95% - achieved with integrated 140mΩ MOSFETs and low-loss ceramic output capacitors. |
Pinout & Package
MP2309DS-LF-Z is housed in an industry-standard 8-pin SOIC package (MP2309_PD01_SOIC8), with exposed pad not present; thermal resistance θJA = 90°C/W on 4-layer PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BS | Bootstrap Supply Input | Connects 0.01μF+ capacitor between BS and SW to generate >VIN gate drive for high-side MOSFET. |
| 2 IN | Main Power Input | Accepts 4.75–23V supply; requires local 10μF ceramic bypass to GND for noise suppression. |
| 3 SW | Switch Node | Drives external inductor; also serves as charge path for BS capacitor during low-side conduction. |
| 4 GND | Power & Signal Ground | Common return for IN, SW, FB, COMP, EN, SS; must be low-impedance plane for stability. |
| 5 FB | Voltage Feedback Input | Senses output via resistive divider; regulates to 0.923V - determines VOUT = 0.923 × (1 + R1/R2). |
| 6 COMP | Loop Compensation Node | Output of internal error amplifier; connects RC network to GND to set pole-zero for stable transient response. |
| 7 EN | Enable Control Input | Active-high digital enable; 1.5V threshold ensures robust startup; 100kΩ pull-up enables default-on operation. |
| 8 SS | Soft-Start Timing Input | Connects capacitor to GND; 0.1μF yields 15ms ramp - prevents inrush into downstream capacitance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | Dual 140mΩ N-MOSFETs eliminate external switches and reduce BOM count and layout complexity. |
| Current-Mode Control | Enables fast load transient response (<10μs recovery) and inherent cycle-by-cycle current limiting. |
| Stable with Ceramic Output Caps | No minimum ESR requirement - supports small, reliable X5R/X7R MLCCs instead of bulkier tantalum/electrolytic. |
| Programmable Soft-Start | Capacitor-set delay (e.g., 15ms with 0.1μF) prevents input rail collapse during system power-up. |
| UVLO & EN Lockout | Independent 4.10V input UVLO and 2.5V EN lockout prevent erratic operation during brownout conditions. |
Applications
| Point-of-Load FPGA Core Supply | Industrial Sensor Node Power |
|---|---|
Use Scenario: Powers 28nm FPGA core rail (1.0V @ 800mA) from 12V intermediate bus in programmable logic controller. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise core voltage with fast transient response to logic switching. Use Value: Integrated MOSFETs and 0.923V reference enable ±1% output accuracy across temperature; 340kHz switching allows compact 10μH inductor and 22μF ceramic output cap. |
Use Scenario: Supplies 3.3V/500mA to ultra-low-power wireless sensor node (MCU + BLE + analog front-end) powered by 9V battery or energy harvester. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating in light-load burst mode; shutdown current <1μA extends battery life. Use Value: Wide 4.75–23V input accommodates decaying battery or variable harvester output; SOIC8 package simplifies manual rework in low-volume production. |
| Notebook I/O Rail Generation | Green Appliance Control Board |
Use Scenario: Generates 5V/1A USB-C peripheral rail from 19V laptop adapter in compact motherboard layout. IC Role / Device Role / Timing Role: Secondary buck converter delivering clean, isolated I/O power with minimal footprint and thermal rise. Use Value: Fixed 340kHz frequency avoids audible noise; integrated MOSFETs eliminate gate driver losses; EN pin enables software-controlled rail sequencing. |
Use Scenario: Powers microcontroller, display, and motor driver logic in ENERGY STAR–certified smart washing machine control board. IC Role / Device Role / Timing Role: Main 3.3V system rail regulator handling mixed digital/analog loads with high reliability under line-voltage fluctuations. Use Value: Input UVLO (4.10V) prevents malfunction during brownouts; 160°C thermal shutdown protects against enclosure overheating; RoHS-compliant LF-Z variant meets global compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2307DJ-LF-Z | Lower 16V max input, 2A output, same SOIC8 package but different pinout (no BS pin; integrated bootstrap) | Better suited for 5V/12V-only systems needing higher current; incompatible pin-for-pin replacement due to missing BS/SW separation | Select when input ≤16V and 2A output is required; verify PCB layout change for non-BS architecture |
| TPS54202DRCT | TI part: 6V–18V input, 2A, 500kHz, 0.8V ref, different compensation scheme and EN polarity | Higher switching frequency enables smaller magnetics; requires external MOSFETs; tighter ref tolerance (±1%) | Choose for designs prioritizing size reduction over input voltage headroom; redesign COMP and feedback network required |
Compared with MP2307DJ-LF-Z, MP2309DS-LF-Z offers wider input range (up to 23V) and explicit bootstrap control for higher efficiency at high duty cycles; versus TPS54202DRCT, it trades higher frequency for simpler layout and lower component count, while maintaining competitive efficiency above 90%.
Availability
MP2309DS-LF-Z is available at Aetrix Electronics and suitable for FPGA power supplies, industrial sensor nodes, notebook I/O rails, and green appliance control boards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2309DS-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, headquartered in California and serving global industrial, computing, and automotive markets since 1997.
The MP2300-series buck converters are designed for cost-sensitive, space-constrained DC-DC applications demanding high integration, wide input range, and robust protection - targeting embedded systems, consumer electronics, and industrial controls.
FAQ
What is the maximum recommended output voltage for MP2309DS-LF-Z?
The MP2309DS-LF-Z supports output voltages up to 20V, set by the feedback divider ratio (VOUT = 0.923V × (1 + R1/R2)). This limit arises from internal voltage ratings and stability constraints - exceeding 20V risks violating the absolute maximum rating on the FB pin and may compromise loop stability with standard compensation networks.
Can MP2309DS-LF-Z operate without an external bootstrap capacitor?
No - the BS pin requires a minimum 0.01μF ceramic capacitor connected between BS and SW to charge the high-side gate driver. Omitting this capacitor prevents proper high-side MOSFET turn-on, causing failure to regulate or immediate thermal shutdown due to shoot-through or excessive conduction loss.
Is an external Schottky diode required for basic operation?
No - the MP2309DS-LF-Z uses synchronous rectification with integrated low-side MOSFET, eliminating the need for an external diode. An optional Schottky (e.g., B130) may improve efficiency by ~1–2% under light loads or high duty cycles, but it is not required for functionality or stability.
How does the EN pin behave during power-up?
The EN pin has a rising threshold of 1.5V (typ.) and hysteresis of 210mV, with a lockout threshold at 2.5V. When pulled up via 100kΩ to IN, it ensures reliable startup once input reaches ~4.75V; below EN threshold, the device draws only 1μA and holds SW low, preventing unintended switching.
What is the minimum output capacitor ESR requirement?
There is no minimum ESR requirement - the MP2309DS-LF-Z is explicitly designed to be stable with zero-ESR ceramic capacitors. Unlike older controllers, its current-mode architecture and compensation flexibility allow use of low-ESR X5R/X7R MLCCs (e.g., 22μF/6.3V) without risk of oscillation or poor transient response.
Does MP2309DS-LF-Z support forced PWM or power-save mode?
No - the MP2309DS-LF-Z operates exclusively in forced continuous conduction mode (CCM) at fixed 340kHz. It does not feature pulse-skipping or discontinuous conduction mode (DCM) for light-load efficiency optimization; efficiency drops below ~100mA but remains functional down to zero load.
What is the purpose of the SS pin's soft-start function?
The SS pin controls the rate at which the internal reference ramps from 0V to full scale, limiting inrush current into output capacitance during startup. With a 0.1μF capacitor to GND, soft-start lasts 15ms - sufficient to prevent input rail sag and avoid tripping upstream current limits in multi-rail systems.
MP2309DS-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):
- 4.75V
- Voltage - Input (Max):
- 23V
- Voltage - Output (Min/Fixed):
- 0.923V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 1A
- Frequency - Switching:
- 340kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MP2309DS-LF-Z FAQ
1.How can I place an order for MP2309DS-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2309DS-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 MP2309DS-LF-Z reliable?
The price and inventory of MP2309DS-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 MP2309DS-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2309DS-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2309DS-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2309DS-LF-Z?
MP2309DS-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2309DS-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 MP2309DS-LF-Z?
For technical support, including MP2309DS-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2309DS-LF-Z requirements.
6.How does Aetrix verify that MP2309DS-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2309DS-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 MP2309DS-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2309DS-LF-Z?
All MP2309DS-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2309DS-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 MP2309DS-LF-Z part is unused and in its original packaging.
Return procedure for MP2309DS-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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