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Monolithic Power Systems Inc. MP2918GF
- Part No.:
- MP2918GF
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MP2918GF.pdf
- Description:
- 4V-40V INPUT, CURRENT MODE SYNCH
- Quantity:
- Payment:
- Shipping:
Inventory:2,088
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Product details
Overview
MP2918GF from Monolithic Power Systems is a high-voltage, current-mode, synchronous step-down DC/DC controller IC designed for automotive and industrial power conversion. It operates from 4V to 40V input, delivers precise 0.8V ±1.5% reference regulation, supports programmable 100–1000kHz switching frequency, and drives dual N-channel MOSFETs in buck topologies for up to 25V output. Used in cold-crank automotive systems where low-dropout operation (99.5% max duty cycle) maintains regulation during battery sag.
For engineers reviewing the MP2918GF datasheet, MP2918GF pinout, MP2918GF application, or MP2918GF equivalent, key selection criteria include its dual-MOSFET gate drive capability, selectable CCM/AAM mode, precision OVP/OCP protection, and TSSOP20-EP package thermal performance - all critical for high-reliability 12V/24V system power rails.
Technical Context
The MP2918GF implements peak current-mode control with slope compensation, cycle-by-cycle current limiting, and an internal error amplifier (70dB DC gain, 500μS transconductance) referenced to a 0.8V bandgap. Its PWM architecture uses COMP voltage to modulate top-gate (TG) on-time while enforcing dead time (60ns) between TG and bottom-gate (BG) transitions.
It features dual power supply options: VCC1 derived from VIN (4.5–5.5V, ±3% load regulation) or externally supplied via VCC2 (4.7–12V), enabling efficiency optimization in multi-rail systems. Advanced Asynchronous Mode (AAM) is triggered when CCM/AAM pin voltage drops below 480mV, dynamically reducing switching frequency under light load to improve efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 40V - supports automotive battery range including cold-crank (4.5V UVLO rising threshold) and industrial 24V/36V rails. |
| Reference Voltage | 0.800V ±1.5% over temperature - enables accurate output regulation (e.g., 5V ±3% with standard resistor divider). |
| Switching Frequency | 100kHz to 1000kHz, programmable via FREQ pin resistor or external sync clock - allows EMI tuning and inductor size optimization. |
| Max Duty Cycle | 99.5% - sustains regulation down to ~0.5V dropout (VIN – VOUT), critical for automotive start-stop and cold-crank. |
| Current Sense Threshold | 25mV / 50mV / 75mV (ILIM-selectable) - sets precise peak inductor current limit with ±10% tolerance, enabling robust short-circuit hiccup protection. |
| OVP Threshold | 110–120% of VFB - triggers immediate discharge mode (BG on, TG off) to clamp overvoltage within 37μs PG delay, protecting downstream loads. |
| Thermal Shutdown | 170°C with 20°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
MP2918GF is packaged in TSSOP20-EP (exposed pad), optimized for thermal dissipation in high-power density applications. The exposed pad must be connected to both SGND and PGND for effective heat transfer and noise isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Main input supply connection | Accepts 4–40V; requires local ceramic decoupling to suppress high di/dt spikes at switch node. |
| EN/SYNC (Pin 2) | Enable and synchronization input | 1.22V enable threshold with 130mV hysteresis; doubles as 100–1000kHz sync input for EMI-sensitive multi-converter systems. |
| VCC2 (Pin 3) | External bias supply input | Enables VCC1 sourcing from external rail (4.7–12V), reducing VIN power loss and improving full-load efficiency by >2%. |
| VCC1 (Pin 4) | Internal bias regulator output | 5V ±5% regulated supply for gate drivers and analog circuitry; requires ≥1μF ceramic cap to PGND for stability. |
| SGND (Pin 5) | Signal ground reference | Low-noise return for FB, COMP, SS; must be star-connected to output capacitor negative terminal to avoid sensing errors. |
| SS (Pin 6) | Soft-start timing control | Charged by 4μA internal current source; external capacitor sets ramp time (e.g., 100nF → ~20ms soft-start) to prevent output overshoot. |
| COMP (Pin 7) | Error amplifier compensation node | Connect R-C network here to stabilize loop response; typical Type II compensation achieves >60° phase margin across load/line variations. |
| FB (Pin 8) | Output voltage feedback input | Compares divided VOUT against 0.8V reference; 10nA input bias enables high-impedance dividers without gain error. |
| CCM/AAM (Pin 9) | Conduction mode select | Logic-level input: float/VCC1 = CCM; resistor-to-SGND = AAM (VAAM < 480mV) for light-load efficiency boost. |
| FREQ (Pin 10) | Frequency programming | Resistor-to-SGND sets fSW (e.g., 45.3kΩ → 430kHz); enables precise EMI binning and inductor selection. |
| PG (Pin 11) | Power-good open-drain output | Asserts low when VOUT deviates >±10% from target; 37μs rise/fall delays ensure glitch immunity during transients. |
| ILIM (Pin 12) | Current limit threshold select | Three fixed sense voltages (25/50/75mV) set peak inductor current limit; no external resistor needed for standard configurations. |
| SYNCO (Pin 13) | Synchronization output | 180° out-of-phase clock signal for interleaving second MP2918GF channel, reducing input/output ripple by up to 50%. |
| SENSE− / SENSE+ (Pins 14/15) | Differential current sense inputs | Measure MOSFET RDS(on) or shunt voltage; common-mode range 0–25V enables high-side or low-side sensing in buck topology. |
| PGND (Pin 16) | Power ground return | High-current return for BG driver and VCC1 regulator; must be low-inductance path to minimize switching noise coupling. |
| BG (Pin 17) | Bottom gate driver output | Drives synchronous N-FET source; 1Ω pull-down ensures fast turn-off and prevents shoot-through during dead time. |
| SW (Pin 18) | Switch node | Connects to inductor and high-side FET drain; serves as return for BST capacitor charging and high-frequency current path. |
| TG (Pin 19) | Top gate driver output | Floating driver powered by BST; 2Ω pull-up/1Ω pull-down enables fast, controlled turn-on/off of high-side N-FET. |
| BST (Pin 20) | Bootstrap supply | Charged via diode from VCC1 to SW; 0.1μF ceramic cap required between BST and SW to sustain TG drive during 99.5% duty cycles. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable AAM/CCM mode | Selectable conduction mode via single resistor: AAM improves light-load efficiency by >15% at 10mA; CCM ensures constant frequency for EMI predictability. |
| Integrated dual N-FET gate drivers | TG/BG drivers deliver 2Ω/1Ω pull-down and 2Ω/3Ω pull-up impedance - sufficient to drive 10nC gate charge at 500kHz with <10ns propagation delay. |
| Precision 0.8V reference | ±1.5% accuracy over −40°C to +125°C - eliminates need for external trimming in automotive temperature ranges. |
| Hiccup-mode over-current protection | Auto-restarts after fault clearance; limits average short-circuit current to <1A, preventing thermal runaway during sustained output shorts. |
| Low-dropout operation | Maintains regulation at VIN − VOUT ≤ 0.5V via BST UVLO management - enables 3.3V/5V outputs from 4.2V cold-crank battery. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powers 5V/3A core logic and 3.3V/2A interface rails in head-unit systems subjected to 4.5–42V battery transients and cold-crank dips. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating main 5V rail; provides PG signal for MCU reset sequencing and SYNCO for interleaved 3.3V rail. Use Value: 99.5% max duty cycle sustains 5V output during 6V cold-crank; AAM reduces no-load quiescent current to 250μA, extending standby battery life. |
Use Scenario: Generates isolated 12V/1A auxiliary supply for analog sensor front-ends and digital I/O in factory automation controllers. IC Role / Device Role / Timing Role: High-voltage step-down controller accepting 24VDC field bus input; FB loop compensated for 100kHz–1MHz transient response per IEC 61000-4-4. Use Value: 40V absolute max input rating withstands 36V surges; OVP clamps transients within 2μs, protecting sensitive ADC references and isolators. |
| Telecom Remote Radio Unit (RRU) | Medical Imaging Power Subsystem |
|
Use Scenario: Supplies 12V/8A RF power amplifier bias in outdoor base station RRUs operating from −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Current-mode controller driving discrete 60V N-FETs; synchronized to system clock via EN/SYNC to avoid beat frequencies in RF bands. Use Value: Programmable 100–1000kHz frequency avoids GSM/UMTS/LTE interference bands; thermal shutdown at 170°C prevents field failure during enclosure overheating. |
Use Scenario: Provides tightly regulated 15V/4A supply for CCD/CMOS sensor bias and analog front-end in portable ultrasound devices. IC Role / Device Role / Timing Role: Precision buck controller with 0.8V ±1.5% reference and PG monitoring - ensures image sensor VDD stability within ±10mV during scan sequences. Use Value: Soft-start (SS) prevents 500mV output overshoot during power-on; hiccup OCP limits fault energy during probe cable short events. |
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 |
|---|---|---|---|
| LM5116PWPR | Wider 6–100V input; no integrated VCC2 option; uses voltage-mode control with external ramp injection. | Preferred for >60V industrial solar or PoE++ systems; lacks AAM for light-load efficiency optimization. | Choose LM5116PWPR only if input exceeds 40V or voltage-mode control is mandated by existing design legacy. |
| RT7297CGQW | 4–36V input; integrated high-side FET (not controller-only); fixed 500kHz frequency; no SYNC or SYNCO pins. | Suitable for space-constrained consumer electronics; cannot support dual-phase interleaving or external clock synchronization. | Select RT7297CGQW only for cost-sensitive, single-rail, non-synchronized applications where board area is critical and input stays ≤36V. |
Compared with LM5116PWPR and RT7297CGQW, MP2918GF uniquely balances wide-input flexibility (4–40V), controller-level design freedom (dual external FETs), and advanced power management (AAM, SYNC/SYNCO, VCC2 bias) - making it optimal for automotive and industrial systems requiring reliability, efficiency, and EMI control.
Availability
MP2918GF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC power modules, and telecom remote radio units requiring stable component supply across extended temperature and voltage ranges.
Supply support for MP2918GF 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 MP2918GF belongs to MPS's high-voltage DC/DC controller product line, engineered specifically for automotive and industrial applications demanding robustness across wide input ranges, precise regulation, and intelligent power management features.
FAQ
What is the maximum output voltage supported by MP2918GF?
The MP2918GF itself does not regulate output voltage directly but controls external MOSFETs to generate regulated outputs. Per datasheet Recommended Operating Conditions, maximum VOUT is ≤25V - limited by internal OVP threshold (120% × 0.8V = 0.96V FB), gate driver voltage ratings, and safe operation of external components. Higher outputs require careful layout and external OVP clamping.
Can MP2918GF operate without an external VCC2 supply?
Yes. When VCC2 is unconnected or held below 4.7V, the internal LDO derives VCC1 from VIN (4.5–5.5V). This configuration increases VIN supply current (typ. 1000μA vs. 40μA with VCC2 bias) and reduces full-load efficiency by ~2–3%, but maintains full functionality including gate drive and protection features.
How is the current limit threshold selected on MP2918GF?
ILIM pin status selects one of three fixed current sense thresholds: 25mV (ILIM = SGND), 50mV (ILIM = VCC1), or 75mV (ILIM = floating). These correspond to peak inductor current limits of IPEAK = VSENSE/RSENSE. No external resistor is required - the selection is purely connection-based and validated in production testing.
What is the purpose of the SYNCO pin, and how is it used?
SYNCO outputs a 180° out-of-phase clock signal synchronized to the internal oscillator when operating in CCM mode. It enables interleaved operation of two MP2918GF controllers - reducing input/output ripple current by up to 50% and easing EMI filter design. It is not functional in AAM mode.
Does MP2918GF support forced continuous conduction mode (FCCM)?
No. MP2918GF supports only two operational modes: Continuous Conduction Mode (CCM), enabled when CCM/AAM pin is floating or tied to VCC1; and Advanced Asynchronous Mode (AAM), enabled when CCM/AAM is pulled low via resistor to SGND. There is no dedicated FCCM pin or register setting - mode selection is strictly analog and hardware-configured.
What thermal derating applies to MP2918GF in TSSOP20-EP package?
In TSSOP20-EP with JEDEC-standard 4-layer PCB (JESD51-7), θJA = 40°C/W. At TA = 85°C, maximum allowable power dissipation is PD(MAX) = (150°C − 85°C)/40 = 1.625W. Exceeding this causes thermal shutdown at 170°C junction temperature, with 20°C hysteresis ensuring safe cooldown before restart.
How does the soft-start function interact with fault conditions?
The internal SS ramp resets to 0V upon any active fault except over-voltage protection (OVP). If OCP, thermal shutdown, or UVLO occurs during startup, SS restarts from zero once the fault clears and EN/SYNC re-enables - ensuring repeatable, overshoot-free re-start without manual intervention.
MP2918GF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- PWM Signal
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 40V
- Frequency - Switching:
- 100kHz ~ 1MHz
- Duty Cycle (Max):
- 99.5%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
MP2918GF FAQ
1.How can I place an order for MP2918GF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2918GF 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 MP2918GF reliable?
The price and inventory of MP2918GF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2918GF is usually 5 days.
3.What payment methods are accepted for MP2918GF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2918GF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2918GF?
MP2918GF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2918GF 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 MP2918GF?
For technical support, including MP2918GF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2918GF requirements.
6.How does Aetrix verify that MP2918GF is sourced from the original manufacturer or authorized distributors?
All MP2918GF 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 MP2918GF meets industry standards.
7.What is the process for return or replacement of MP2918GF?
All MP2918GF units undergo pre-shipment inspection (PSI). If there is an issue with MP2918GF, 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 MP2918GF part is unused and in its original packaging.
Return procedure for MP2918GF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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