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Monolithic Power Systems Inc. MP2918GL-Z
- Part No.:
- MP2918GL-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TFQFN Exposed Pad
- Datasheet:
-
MP2918GL-Z.pdf
- Description:
- 4V-40V INPUT, CURRENT MODE SYNCH
- Quantity:
- Payment:
- Shipping:
Inventory:4,490
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Product details
Overview
MP2918GL-Z from Monolithic Power Systems is a 4V–40V input, current-mode, synchronous step-down controller IC that drives dual N-channel MOSFETs in high-efficiency DC/DC conversion. It features programmable 100–1000kHz switching frequency, ±1.5% 0.8V reference accuracy, 99.5% max duty cycle for cold-crank automotive operation, and integrated OVP/OCP/thermal shutdown. It is used in 12V/24V automotive power rails and industrial 24V–36V intermediate bus converters.
For engineers reviewing the MP2918GL-Z datasheet, MP2918GL-Z pinout, MP2918GL-Z application, or MP2918GL-Z equivalent, key selection considerations include its dual-N-FET gate drive capability, AAM/CCM mode control via CCM/AAM pin, 75mV current-sense threshold option (ILIM floating), and TSSOP20-EP/QFN-20 package thermal performance with exposed pad grounding.
Technical Context
The MP2918GL-Z implements peak current-mode control with slope compensation, using an internal 0.8V reference and error amplifier output on COMP to modulate top-gate (TG) pulse width. Its PWM architecture supports precise cycle-by-cycle current limiting with three fixed sense thresholds (25/50/75mV) selected by ILIM pin state.
It integrates dual gate drivers (TG/BG) with 2Ω pull-up/1Ω pull-down strength, bootstrap (BST) supply management with 3.05V UVLO, and programmable soft-start via external SS capacitor. Advanced Asynchronous Mode (AAM) enables light-load efficiency optimization by dynamically adjusting switching frequency based on COMP voltage crossing a user-set VAAM threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 40V - Supports automotive battery transients (cold crank down to 4V) and industrial 24V/36V systems without pre-regulation. |
| Feedback Reference | 0.800V ±1.5% - Enables accurate output regulation across -40°C to +125°C junction temperature range. |
| Switching Frequency | 100kHz–1000kHz - Programmable via FREQ resistor or synchronized externally; critical for EMI compliance in noise-sensitive applications. |
| Max Duty Cycle | 99.5% - Allows ultra-low dropout operation essential for automotive cold-crank (e.g., 6VIN → 5VOUT at full load). |
| Current Sense Threshold | 75mV (ILIM floating) - Sets nominal over-current limit for 50A+ output designs using 1.5mΩ sense resistors. |
| Gate Drive Strength | TG: 2Ω pull-up / 1Ω pull-down; BG: 3Ω pull-up / 1Ω pull-down - Ensures fast MOSFET turn-on/off with <250ns min on-time support. |
| Power Good Accuracy | ±3.5% VFB window (85–96.5% rising / 81–92.5% falling) - Provides reliable system power sequencing and fault detection. |
Pinout & Package
MP2918GL-Z is packaged in QFN-20 (3mm × 4mm) with exposed thermal pad, optimized for high-power density and thermal dissipation in space-constrained automotive and industrial PCBs.
| 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 during switching. |
| EN/SYNC (Pin 2) | Enable input / external clock sync | 1.22V enable threshold with 130mV hysteresis; accepts 100–1000kHz sync signal for EMI reduction. |
| VCC2 (Pin 3) | External bias supply for VCC1 regulator | Enables >90% efficiency boost by powering internal circuitry from regulated 4.7–12V rail instead of VIN. |
| VCC1 (Pin 4) | Internal bias supply output | 5V ±5% regulated output; requires ≥1µF ceramic cap to PGND for stable gate driver operation. |
| SGND (Pin 5) | Signal ground reference | Low-noise analog ground; must be isolated from PGND except at single-point star connection near output caps. |
| SS (Pin 6) | Soft-start timing control | Charged by 4µA internal current source; sets ramp time for controlled VOUT rise and inrush current limiting. |
| COMP (Pin 7) | Error amplifier output | Drives external R-C compensation network to stabilize loop response and ensure phase margin >45°. |
| FB (Pin 8) | Output voltage feedback input | Compares divider output against 0.8V reference; 10nA input bias enables high-resistance dividers for low quiescent current. |
| CCM/AAM (Pin 9) | Conduction mode select | Logic level determines operating mode: float/VCC1 = CCM; SGND-biased = AAM for light-load efficiency optimization. |
| FREQ (Pin 10) | Frequency programming | Resistor-to-SGND sets oscillator frequency; 45.3kΩ yields 430kHz typical - balances efficiency and size. |
| PG (Pin 11) | Open-drain power-good indicator | Signals valid regulation (±10% VOUT) with 37µs rise / 28µs fall delay; requires external pull-up to ≤5V. |
| ILIM (Pin 12) | Current limit threshold select | Three states: SGND = 25mV, VCC1 = 50mV, float = 75mV - enables scalable over-current protection across output currents. |
| SYNCO (Pin 13) | Synchronization output | 180° out-of-phase clock for interleaved dual-phase operation; reduces input/output ripple and EMI. |
| SENSE− (Pin 14) | Negative current sense input | Completes differential sense path; rejects common-mode noise up to 25V CM range for robust current monitoring. |
| SENSE+ (Pin 15) | Positive current sense input | Measures inductor current via shunt; supports valley, peak, and reverse current limit detection per ILIM setting. |
| PGND (Pin 16) | Power ground return | High-current return for bottom gate driver and VCC1 regulator; must connect directly to VCC1 cap negative terminal. |
| BG (Pin 17) | Bottom gate driver output | Drives synchronous N-FET source; 1Ω pull-down ensures fast turn-off to prevent shoot-through during dead time. |
| SW (Pin 18) | Switch node | High dv/dt node connecting HS-FET drain, LS-FET source, and BST capacitor; requires tight layout to minimize ringing. |
| TG (Pin 19) | Top gate driver output | Floats with SW node; drives HS-FET gate using BST-supplied charge; supports >99% duty cycle via low-dropout mode. |
| BST (Pin 20) | Bootstrap supply | Charged via internal diode from VCC1 to SW; requires 0.1µF ceramic cap between BST and SW for stable HS drive. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable AAM/CCM mode | Selectable conduction mode via CCM/AAM pin biasing - enables >92% efficiency at 10mA load while maintaining CCM stability at full load. |
| Dual N-FET gate drivers | Integrated TG/BG drivers with matched 1Ω pull-downs - eliminate need for external drivers and reduce BOM count in high-current designs. |
| Hiccup-mode OCP | Auto-restarting short-circuit protection - limits average fault current to <1A during sustained overload, preventing MOSFET thermal runaway. |
| Low-dropout operation | 99.5% max duty cycle with BST UVLO recovery - sustains regulation during 4.5V automotive cold-crank events without output collapse. |
| External sync & SYNCO output | 100–1000kHz EN/SYNC input + 180° SYNCO output - enables multi-phase synchronization for lower ripple and distributed thermal management. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: 12V vehicle battery powers 5V/3A infotainment head unit with EMC requirements. IC Role / Device Role / Timing Role: Primary step-down controller regulating 12V→5V; manages gate timing, current sensing, and OVP/OCP for safety-critical subsystem. Use Value: 99.5% duty cycle maintains 5V output during 6V cold-crank; AAM mode cuts no-load IQ to <350μA, extending battery life. |
Use Scenario: 24V industrial bus powers isolated 3.3V/2A digital I/O interface with surge immunity. IC Role / Device Role / Timing Role: High-voltage buck controller driving discrete N-FETs; provides precise 0.8V reference and hiccup OCP for field-side reliability. Use Value: 40V absolute max input withstands 36V transients; 75mV current sense enables 2.5mΩ shunt for <1W loss at 2A. |
| Telecom Remote Radio Unit (RRU) | Medical Imaging Power Subsystem |
|
Use Scenario: 48V telecom rectifier supplies 12V/10A for RF power amplifiers in outdoor base stations. IC Role / Device Role / Timing Role: Synchronous buck controller with external MOSFETs; uses SYNCO to synchronize with adjacent converters for EMI reduction. Use Value: 1000kHz max frequency allows compact 2.2µH inductors; QFN-20 package supports 2.6W dissipation at 70°C ambient. |
Use Scenario: 28V medical chassis bus powers 1.2V/15A FPGA core supply requiring ultra-low noise and fail-safe protection. IC Role / Device Role / Timing Role: Controller for high-current multiphase design; FB accuracy ±1.5% ensures FPGA VCCINT tolerance compliance. Use Value: Precision 0.8V reference and 37µs PG delay enable deterministic power sequencing; OVP triggers immediate discharge to protect sensitive logic. |
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 | Wide-input (6–100V), but only 500kHz max frequency; no AAM mode; requires external VREF and compensation. | Lacks programmable light-load efficiency modes; less suitable for automotive battery-powered devices needing low IQ. | Prefer MP2918GL-Z when cold-crank operation, AAM, or integrated 0.8V reference are required. |
| RT7297CZQW | 4–36V input, 600kHz max, integrated 0.6V reference; no SYNCO output or 180° phase shift capability. | Missing dual-phase synchronization feature; limited to single-phase designs where interleaving is not needed. | Choose MP2918GL-Z for multi-phase systems requiring coordinated switching or higher input voltage margin. |
Compared with LM5116PWPR and RT7297CZQW, MP2918GL-Z uniquely combines 40V max input, 1000kHz programmability, AAM for sub-100μA light-load IQ, and 180° SYNCO for interleaving - making it optimal for automotive and high-density industrial power modules.
Availability
MP2918GL-Z is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and telecom remote radio units requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2918GL-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 focus on energy-efficient DC/DC solutions for automotive, industrial, and communications markets.
The MP2918 belongs to MPS's high-voltage synchronous buck controller product line, designed specifically for 12V/24V/48V automotive and industrial power systems demanding wide VIN range, high efficiency across load, and robust protection.
FAQ
What is the maximum allowable input voltage for MP2918GL-Z?
The absolute maximum input voltage (VIN) is 65V, but the recommended operating range is 4V to 40V. Operation above 40V risks exceeding internal device stress limits and may trigger UVLO or thermal shutdown. For 48V telecom applications, derating or transient clamping is advised.
How does the ILIM pin configure current limit thresholds?
ILIM has three fixed configurations: grounded → 25mV threshold; tied to VCC1 → 50mV; left floating → 75mV. Each setting defines the peak inductor current limit (e.g., 75mV with 2mΩ shunt = 37.5A). The threshold is verified across temperature and process corners per datasheet Table 1.
Can MP2918GL-Z operate without an external VCC2 supply?
Yes. With VCC2 unconnected or <4.7V, the internal VCC1 regulator draws from VIN and delivers 5V ±5% to internal circuitry and gate drivers. However, supplying 4.7–12V to VCC2 reduces power loss and improves efficiency by bypassing the VIN-to-VCC1 LDO.
What is the purpose of the SYNCO pin in multi-phase designs?
SYNCO outputs a 180° out-of-phase clock signal synchronized to the internal oscillator. In dual-phase configurations, this enables interleaved switching - halving input/output ripple current and reducing EMI filter size compared to parallel non-interleaved controllers.
Does MP2918GL-Z support forced continuous conduction mode (FCCM)?
No - it supports Continuous Conduction Mode (CCM) and Advanced Asynchronous Mode (AAM), but not forced CCM independent of load. CCM is active when CCM/AAM is floating or tied to VCC1; AAM engages automatically under light load when COMP voltage drops below VAAM.
How is soft-start time calculated for MP2918GL-Z?
Soft-start time tSS (ms) = (1.2V − 0.8V) × CSS(nF) / 4μA, where CSS is the external capacitor from SS to SGND. For example, a 100nF capacitor yields ~10ms ramp time. SS resets on OCP or thermal fault (but not OVP).
What thermal considerations apply to the QFN-20 package?
The QFN-20 (3mm×4mm) has θJA = 48°C/W and θJC = 10°C/W. To maintain TJ ≤125°C at 2.6W dissipation, the PCB must provide ≥200mm² copper area under the exposed pad, connected to both SGND and PGND with ≥6 thermal vias.
MP2918GL-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 20-TFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-QFN (3x4)
MP2918GL-Z FAQ
1.How can I place an order for MP2918GL-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2918GL-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 MP2918GL-Z reliable?
The price and inventory of MP2918GL-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2918GL-Z is usually 5 days.
3.What payment methods are accepted for MP2918GL-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2918GL-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2918GL-Z?
MP2918GL-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2918GL-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 MP2918GL-Z?
For technical support, including MP2918GL-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2918GL-Z requirements.
6.How does Aetrix verify that MP2918GL-Z is sourced from the original manufacturer or authorized distributors?
All MP2918GL-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 MP2918GL-Z meets industry standards.
7.What is the process for return or replacement of MP2918GL-Z?
All MP2918GL-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2918GL-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 MP2918GL-Z part is unused and in its original packaging.
Return procedure for MP2918GL-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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