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Monolithic Power Systems Inc. MP2918GF-Z
- Part No.:
- MP2918GF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MP2918GF-Z.pdf
- Description:
- 4V-40V INPUT, CURRENT MODE SYNCH
- Quantity:
- Payment:
- Shipping:
Inventory:2,719
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Product details
Overview
MP2918GF-Z from Monolithic Power Systems is a 4V–40V input, current-mode, synchronous step-down DC/DC controller IC that drives dual N-channel MOSFETs to regulate output voltage with programmable frequency (100–1000 kHz), 0.8V ±1.5% reference accuracy, and advanced asynchronous mode (AAM) for light-load efficiency optimization - used in automotive cold-crank and industrial power supply designs.
For engineers reviewing the MP2918GF-Z datasheet, MP2918GF-Z pinout, MP2918GF-Z application, or MP2918GF-Z equivalent, key selection criteria include its dual-N-FET gate drive capability, 99.5% max duty cycle for low-dropout operation, precision OVP/OCP protection, and flexible CCM/AAM mode control via external resistor configuration.
Technical Context
The MP2918GF-Z implements peak current-mode control with slope compensation, cycle-by-cycle current limiting, and internal error amplifier (70 dB DC gain, 500 µS transconductance) referenced to a stable 0.8V bandgap. Its PWM oscillator supports resistor-programmed or external-synchronized operation (100–1000 kHz), with SYNCO providing 180° out-of-phase clock for multi-phase interleaving.
It integrates dual gate drivers (TG/BG) with 2 Ω pull-up / 1 Ω pull-down resistance, 60 ns dead time, and bootstrap (BST) circuitry with UVLO (3.05 V, 170 mV hysteresis). The VCC1 regulator operates from VIN (4.5–5.5 V output) or external VCC2 (4.7–12 V), enabling high-efficiency bias sourcing from downstream rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 40 V - supports automotive battery systems including cold-crank (down to 4 V) and industrial 24 V rails. |
| Feedback Reference | 0.800 V ±1.5% - enables precise output regulation (e.g., 5 V ±37.5 mV) across -40°C to +125°C junction temperature. |
| Switching Frequency | 100 kHz to 1000 kHz - programmable via FREQ pin resistor or synchronized externally to reduce EMI in noise-sensitive applications. |
| Max Duty Cycle | 99.5% - allows ultra-low dropout operation (e.g., 5 V out from 5.2 V in), critical for automotive start-stop and brownout resilience. |
| Current Sense Threshold | 15–85 mV (3 options via ILIM pin) - sets peak inductor current limit with ±10% tolerance, enabling scalable power stage design. |
| OVP Threshold | 110–120% of VFB - triggers fast discharge mode (HS-FET off, LS-FET on) to protect downstream loads from overvoltage faults. |
| Thermal Shutdown | 170°C with 20°C hysteresis - provides robust thermal protection while allowing full rated operation up to +125°C TJ. |
Pinout & Package
MP2918GF-Z is packaged in TSSOP-20-EP (exposed pad), with pin 1 at top-left corner when marking side faces up. The exposed thermal pad must be soldered to PCB copper connected to both SGND and PGND for optimal thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Main input supply connection | Accepts 4–40 V; requires local ceramic bypass capacitor to suppress high-frequency switching transients. |
| EN/SYNC (Pin 2) | Enable and synchronization input | 1.22 V threshold enables UVLO programming or external clock sync (100–1000 kHz); 130 mV hysteresis prevents chatter. |
| VCC2 (Pin 3) | External bias supply input | Enables VCC1 regulation from external 4.7–12 V source (e.g., downstream rail), reducing dissipation and improving efficiency. |
| VCC1 (Pin 4) | Internal bias supply output | 5 V ±5% regulated output powering gate drivers and analog circuitry; requires ≥1 µF ceramic decoupling to PGND. |
| SGND (Pin 5) | Signal ground reference | Low-noise analog ground for FB, COMP, SS; must be star-connected near output capacitors to minimize noise coupling. |
| SS (Pin 6) | Soft-start timing control | Charged by 4 µA internal current source; external capacitor sets ramp time (e.g., 100 nF → ~20 ms soft-start). |
| COMP (Pin 7) | Error amplifier compensation node | Connect R-C network (e.g., 10 kΩ + 1 nF) to SGND to stabilize loop response and ensure phase margin >45°. |
| FB (Pin 8) | Output voltage feedback input | Compares divider output against 0.8 V reference; 10 nA input bias enables high-impedance resistive dividers. |
| CCM/AAM (Pin 9) | Conduction mode select | Logic level determines operating mode: float/VCC1 = CCM; resistor-to-SGND = AAM (VAAM ≥ 480 mV required). |
| FREQ (Pin 10) | Frequency set resistor connection | Resistor to SGND programs switching frequency (e.g., 45.3 kΩ → 430 kHz typical); tolerance affects accuracy ±15%. |
| PG (Pin 11) | Power-good open-drain output | Asserts low when VOUT deviates >±10% from target; 37 µs rise / 28 µs fall delay ensures glitch immunity. |
| ILIM (Pin 12) | Current limit threshold select | Three fixed sense voltages: SGND = 25 mV, VCC1 = 50 mV, float = 75 mV - sets peak inductor current limit directly. |
| SYNCO (Pin 13) | Synchronization clock output | 180° out-of-phase square wave for dual-phase interleaving; enables current sharing and reduced input/output ripple. |
| SENSE− (Pin 14) | Negative current sense input | High-side or low-side current sensing node; differential input accepts common-mode up to 25 V with ±0.7 V range. |
| SENSE+ (Pin 15) | Positive current sense input | Paired with SENSE−; used with shunt or DCR sensing; input bias current varies with common-mode voltage (±20–205 µA). |
| PGND (Pin 16) | Power ground return | High-current return path for VCC1 regulator and bottom gate driver; must connect directly to VCC1 capacitor negative terminal. |
| BG (Pin 17) | Bottom gate driver output | Drives low-side N-MOSFET gate; 3 Ω pull-up / 1 Ω pull-down ensures fast turn-on/turn-off and minimal shoot-through risk. |
| SW (Pin 18) | Switch node | Connection point between HS-FET drain and LS-FET source; also serves as BST capacitor return and high-current AC path. |
| TG (Pin 19) | Top gate driver output | Floating driver for high-side N-MOSFET; powered by BST capacitor; includes UVLO (3.05 V) to prevent weak turn-on. |
| BST (Pin 20) | Bootstrap supply input | Connect 0.1 µF ceramic capacitor to SW; charged via internal diode from VCC1 during LS-FET conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Dual N-MOSFET gate drive | Integrated TG/BG drivers with matched 60 ns dead time, 2 Ω/1 Ω pull strength, and independent UVLO - eliminates need for external drivers in 200 W+ designs. |
| Programmable conduction mode | CCM/AAM pin selects continuous conduction (CCM) or advanced asynchronous mode (AAM) - improves light-load efficiency by >15% vs. forced CCM at 10 mA load. |
| Precision OVP & hiccup OCP | 115% VFB OVP triggers immediate discharge mode; hiccup OCP limits average short-circuit current to <1 A - protects MOSFETs and magnetics during fault conditions. |
| Low-dropout operation | 99.5% max duty cycle + BST UVLO management enables regulation down to VIN − VOUT = 200 mV - supports automotive cold-crank (5.5 V in → 5 V out). |
| Flexible bias architecture | VCC1 can be powered from VIN (4.5–5.5 V LDO) or external VCC2 (4.7–12 V), reducing total system losses by up to 0.5 W in multi-rail converters. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powers 5 V/3 A core logic and 3.3 V/2 A interface rails in head-unit ECUs under wide battery voltage (6–16 V nominal, 4–40 V transient). IC Role / Device Role / Timing Role: Primary synchronous buck controller managing dual-output regulation, thermal foldback, and cold-crank hold-up via 99.5% duty cycle. Use Value: Eliminates need for pre-regulator stages; maintains regulation during 4.5 V battery dips without output collapse or reset. |
Use Scenario: Generates isolated 12 V/1 A auxiliary supply for analog sensor front-ends and digital isolators in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: High-voltage step-down controller driving discrete N-MOSFETs, synchronized to system clock to avoid beat frequencies with ADC sampling. Use Value: Reduces conducted EMI by 12 dB through EN/SYNC synchronization; enables compact layout with integrated gate drive and thermal pad. |
| Telecom Remote Radio Unit (RRU) | Medical Imaging Power Sequencing |
|
Use Scenario: Provides 28 V/5 A intermediate bus from 48 V telecom rectifier in outdoor base station radios operating at -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Current-mode controller with external sync (156.25 MHz divided to 312.5 kHz) to align switching with data transmission bursts. Use Value: SYNCO output enables dual-phase interleaving with MP2918GL-Z, cutting input ripple current by 60% and easing bulk capacitor sizing. |
Use Scenario: Sequenced 3.3 V/2 A and 1.8 V/1.5 A supplies for FPGA-based image reconstruction engines requiring strict power-up order and fault isolation. IC Role / Device Role / Timing Role: Controller with PG output and soft-start coordination - PG signals enable downstream LDOs only after stable 3.3 V is confirmed. Use Value: Prevents FPGA configuration failure by enforcing 20 ms minimum soft-start and 37 µs PG assertion delay before enabling next rail. |
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 |
|---|---|---|---|
| MPQ2918GF-A | Automotive-grade (AEC-Q100 Grade 1), same pinout and electrical specs, qualified for -40°C to +125°C operation with enhanced ESD and latch-up immunity. | Required for automotive safety-critical modules where qualification traceability and PPAP documentation are mandatory. | Select MPQ2918GF-A for automotive production; MP2918GF-Z remains optimal for industrial prototypes and cost-sensitive non-automotive use. |
| LM5116PWPR | 4.5–60 V input, 100–1000 kHz sync, but uses voltage-mode control, no AAM, and requires external bootstrap diode; higher quiescent current (1.5 mA vs. 40 µA). | Used in legacy telecom designs where voltage-mode stability is preferred and light-load efficiency is secondary. | Choose LM5116PWPR only if existing board layout lacks BST capacitor routing or requires voltage-mode loop tuning familiarity. |
Compared with MPQ2918GF-A, the MP2918GF-Z offers identical functionality at lower cost and shorter lead time but lacks AEC-Q100 certification; versus LM5116PWPR, it delivers superior light-load efficiency and integrated bootstrap charging, reducing BOM count by two components.
Availability
MP2918GF-Z is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, telecom remote radio units, and medical imaging power sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MP2918GF-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 over 20 years of leadership in DC/DC conversion, motor drivers, and LED lighting solutions.
The MP2918 belongs to MPS's high-voltage synchronous controller product line, designed specifically for ruggedized power conversion in automotive, industrial, and telecom applications demanding wide VIN, high efficiency, and robust protection.
FAQ
What is the maximum allowable input voltage for continuous operation?
The MP2918GF-Z supports continuous operation up to 40 V input, with absolute maximum rating of 65 V on the IN pin. Exceeding 40 V may trigger overvoltage protection or cause thermal stress beyond design limits, especially at high ambient temperatures or high duty cycles.
Can MP2918GF-Z drive GaN FETs instead of silicon MOSFETs?
Yes - its 2 Ω TG pull-up and 1 Ω BG pull-down drivers, 60 ns dead time, and fast 92 ns minimum TG on-time support enhancement-mode GaN FETs with gate charge ≤25 nC. Layout must minimize SW node parasitics and use Kelvin source connections for accurate current sensing.
How does the ILIM pin setting affect current limit accuracy?
ILIM selects one of three factory-trimmed current sense thresholds: 25 mV (ILIM = SGND), 50 mV (ILIM = VCC1), or 75 mV (ILIM = float). Each option has ±10% tolerance over temperature; accuracy is independent of external resistor tolerances, unlike adjustable current-limit ICs.
Is external bootstrap diode required for BST operation?
No - MP2918GF-Z integrates an internal bootstrap diode from VCC1 to BST. A 0.1 µF ceramic capacitor between BST and SW is mandatory; adding an external Schottky diode is unnecessary and may interfere with internal charging behavior.
What happens during startup if the SS capacitor is omitted?
Omitting the SS capacitor disables soft-start, causing immediate full-reference regulation and potential output overshoot (>20% typical) and inrush current spikes. The IC will still power up, but risk damaging downstream capacitors or triggering OCP during first switch cycle.
Does the PG output require a pull-up resistor?
Yes - PG is an open-drain output and must be pulled up to a voltage ≤5 V (e.g., 3.3 V or 5 V rail) via a 10–100 kΩ resistor. Without pull-up, PG remains floating and cannot signal power-good status to microcontrollers or sequencers.
Can MP2918GF-Z operate without VCC2 connected?
Yes - with VCC2 unconnected or <4.7 V, the internal LDO powers VCC1 from VIN (4.5–5.5 V). This configuration increases VIN supply current (~1 mA) but simplifies design; VCC2 is optional for efficiency improvement only.
MP2918GF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
MP2918GF-Z FAQ
1.How can I place an order for MP2918GF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2918GF-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 MP2918GF-Z reliable?
The price and inventory of MP2918GF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2918GF-Z is usually 5 days.
3.What payment methods are accepted for MP2918GF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2918GF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2918GF-Z?
MP2918GF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2918GF-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 MP2918GF-Z?
For technical support, including MP2918GF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2918GF-Z requirements.
6.How does Aetrix verify that MP2918GF-Z is sourced from the original manufacturer or authorized distributors?
All MP2918GF-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 MP2918GF-Z meets industry standards.
7.What is the process for return or replacement of MP2918GF-Z?
All MP2918GF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2918GF-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 MP2918GF-Z part is unused and in its original packaging.
Return procedure for MP2918GF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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