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Monolithic Power Systems Inc. MP9928GF-P
- Part No.:
- MP9928GF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MP9928GF-P.pdf
- Description:
- 4V-60V INPUT, CURRENT MODE, SYNC
- Quantity:
- Payment:
- Shipping:
Inventory:2,298
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Product details
Overview
MP9928GF-P from Monolithic Power Systems is a high-voltage synchronous step-down controller IC designed for industrial and PoE power systems. It operates from 4V to 60V input, delivers up to 99.5% duty cycle, supports programmable 100–1000kHz switching frequency, integrates dual N-channel MOSFET drivers, and features precision 0.800V ±12mV feedback reference - enabling robust regulation in USB DCP and linear charger supply applications.
For engineers reviewing the MP9928GF-P datasheet, MP9928GF-P pinout, MP9928GF-P application, or MP9928GF-P equivalent, key selection considerations include its AAM/CCM mode selectability, 75mV current limit threshold (ILIM-float), 180° out-of-phase SYNCO output for multi-phase coordination, and dual power supply options (VIN- or VCC2-derived VCC1) for thermal optimization in high-input industrial converters.
Technical Context
The MP9928GF-P implements peak current-mode control with slope compensation, using cycle-by-cycle inductor current sensing via SENSE+/SENSE− differential inputs. Its error amplifier (Gm = 500μA/V, 70dB DC gain) drives COMP to set PWM duty based on FB vs. 0.800V reference, while internal oscillator frequency is resistor-programmed or externally synchronized via EN/SYNC pin.
It supports three operating modes: forced CCM (CCM/AAM pin tied to VCC1 or floating), AAM (CCM/AAM pulled low ≥480mV), and low-dropout mode (99.5% max duty enabled when BST–SW > 3.05V). Fault protection includes OVP (115% VFB trigger), hiccup-mode OCP (75mV sense threshold), and thermal shutdown at 170°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 4V to 60V - supports automotive cold-crank (≥4V post-startup) and PoE++ (57V) input rails |
| Feedback reference voltage | 0.800V ±12mV - enables precise output regulation across –40°C to +125°C junction temperature |
| Switching frequency range | 100kHz to 1000kHz - programmable via external FREQ resistor or synchronized to external clock for EMI reduction |
| Max duty cycle | 99.5% - sustains regulation during ultra-low dropout conditions (e.g., VIN ≈ VOUT) |
| Current limit threshold | 75mV (ILIM floating) - sets nominal overcurrent trip point for external MOSFETs with known RDS(on) |
| OVP trigger threshold | 115% of VFB - provides fast, accurate output overvoltage shutdown before downstream damage occurs |
| Thermal shutdown | 170°C with 20°C hysteresis - prevents permanent silicon damage during sustained overload or poor heatsinking |
Pinout & Package
TSSOP-20-EP package with exposed thermal pad (pin 20 = PGND); 0.65mm pitch, RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Main input supply rail | Accepts 4–60V; requires local ceramic decoupling to suppress high di/dt transients |
| EN/SYNC (Pin 2) | Enable & synchronization input | 1.22V enable threshold with 130mV hysteresis; doubles as sync input for noise-sensitive multi-rail systems |
| VCC2 (Pin 3) | External bias supply input | Enables VCC1 derivation from external 5–12V source to reduce dissipation and improve efficiency |
| VCC1 (Pin 4) | Internal bias regulator output | 5V regulated supply for gate drivers and logic; decoupled with 1–4.7μF ceramic capacitor |
| SGND (Pin 5) | Signal ground reference | Low-noise analog ground for FB, COMP, SS, and current sense circuitry - must be star-connected |
| SS (Pin 6) | Soft-start timing node | Controls startup ramp rate via external capacitor; prevents output overshoot and inrush current stress |
| COMP (Pin 7) | Error amplifier output | Drives external RC compensation network to stabilize loop response and ensure phase margin ≥45° |
| FB (Pin 8) | Output voltage feedback input | Compares resistive divider output against 0.800V reference; 10nA input bias minimizes divider error |
| CCM/AAM (Pin 9) | Mode selection control | Pull low ≥480mV for AAM; float or tie to VCC1 for CCM - determines light-load efficiency strategy |
| FREQ (Pin 10) | Frequency programming node | Resistor-to-SGND sets switching frequency; also sources 9.2μA for AAM threshold calculation |
| PG (Pin 11) | Power-good open-drain output | Indicates VOUT within ±10% of target; 25μs delay ensures stable regulation before assertion |
| ILIM (Pin 12) | Current limit threshold select | Three fixed thresholds: GND=25mV, VCC1=50mV, float=75mV - configures OCP trip point without external components |
| SYNCO (Pin 13) | 180° out-of-phase clock output | Enables interleaved operation with second MP9928 or compatible controller for reduced input/output ripple |
| SENSE− (Pin 14) | Negative current sense input | Differential pair with SENSE+ measures inductor current; common-mode range 0–24V supports high-side sensing |
| SENSE+ (Pin 15) | Positive current sense input | Paired with SENSE−; full-scale differential range ±0.7V enables accurate valley/peak current detection |
| PGND (Pin 16) | Power ground return | High-current return path for BG driver and VCC1 regulator - must connect directly to VCC1 capacitor negative terminal |
| BG (Pin 17) | Bottom gate driver output | Drives synchronous N-MOSFET source; 1Ω pull-down resistance ensures fast turn-off and shoot-through prevention |
| SW (Pin 18) | Switch node | High dv/dt node connecting external HS/LS MOSFETs; serves as return for BST capacitor and bootstrap charging path |
| TG (Pin 19) | Top gate driver output | Bootstrapped floating driver for HS N-MOSFET; 2Ω pull-up / 1Ω pull-down supports fast edge rates and low dead time (60ns) |
| BST (Pin 20) | Bootstrap supply | Charged via internal diode from VCC1 to SW; requires 0.1μF ceramic capacitor between BST and SW for reliable HS drive |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range (4V–60V) | Supports 12V/24V/48V industrial buses and PoE++ (57V) without pre-regulation |
| Dual N-MOSFET drivers | Integrated TG/BG drivers eliminate need for external gate drivers and reduce BOM count |
| AAM/CCM selectable operation | Enables >90% efficiency at 10mA load (AAM) while maintaining tight regulation at full load (CCM) |
| Programmable 100–1000kHz frequency | Allows trade-off between size (higher fSW → smaller inductors) and efficiency (lower fSW → lower switching loss) |
| 180° out-of-phase SYNCO output | Permits seamless interleaving with second MP9928 for 2× current capability and halved input ripple |
| Triple ILIM threshold options | Eliminates need for trimming resistors - 25/50/75mV settings match common RDS(on) ranges of discrete MOSFETs |
Applications
| PD Power Supply in PoE System | USB Dedicated Charging Port (DCP) |
|---|---|
|
Use Scenario: Powered Device (PD) interface in IEEE 802.3bt Type 4 (90W) PoE systems requiring wide-input buck conversion from 57V PSE supply. IC Role / Device Role / Timing Role: Primary step-down controller regulating 5V/12V/24V PD rails; uses AAM mode to maintain >85% efficiency at standby current (<10mA). Use Value: 60V absolute max rating and 4V UVLO falling threshold ensure reliable startup during PoE negotiation and brownout recovery. |
Use Scenario: Standalone USB DCP (BC1.2) charger supplying 5V/1.5A to smartphones and tablets from 12–48V industrial or automotive sources. IC Role / Device Role / Timing Role: Constant-voltage controller with precise 0.800V reference and PG output for host microcontroller sequencing. Use Value: 99.5% max duty cycle enables 5V output from 5.2V input (e.g., automotive battery at cold crank), minimizing dropout losses. |
| Industrial Control Systems | Power Supply for Linear Chargers |
|
Use Scenario: Fieldbus I/O module requiring isolated 3.3V/5V/12V rails from unregulated 24V DC plant power with high EMC immunity. IC Role / Device Role / Timing Role: High-noise-immunity controller using SYNC input to lock switching frequency to system clock, reducing beat frequencies. Use Value: EN/SYNC pin doubles as sync input; 100–1000kHz range allows selection of 333kHz to avoid 200–400kHz CISPR-22 conducted noise bands. |
Use Scenario: Input stage for Li-ion linear charger ICs (e.g., MCP73831) requiring tightly regulated 4.5–5.5V input from 12–48V sources. IC Role / Device Role / Timing Role: Pre-regulator delivering low-noise, low-ripple 5V supply; uses soft-start (SS pin) to prevent charger IC reset during power-up. Use Value: 10nA FB input bias and 70dB error amp gain ensure <1% output deviation under dynamic load steps typical of linear charger input current profiles. |
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 | Requires external slope compensation; no integrated AAM mode; 65V max input; 1.215V reference | Lacks automatic light-load efficiency optimization; less suitable for battery-backed or energy-sensitive PoE PDs | Select if needing higher input voltage margin (65V) and existing LM5116 design infrastructure |
| TPS40210DGQR | Current-mode controller with 75V max input; no integrated VCC regulator; 0.8V reference; no SYNCO output | No built-in 180° clock output for interleaving; requires external LDO for gate drivers; higher external component count | Select for ultra-high-input (75V) applications where interleaving is unnecessary and cost sensitivity outweighs integration benefits |
Compared with LM5116PWPR and TPS40210DGQR, the MP9928GF-P offers superior integration (dual gate drivers, VCC1 regulator, AAM mode, SYNCO), tighter reference accuracy (±12mV vs. ±1.5%), and lower quiescent current (750μA vs. >1.5mA), making it optimal for space-constrained, efficiency-critical industrial and PoE designs.
Availability
MP9928GF-P is available at Aetrix Electronics and suitable for industrial control systems, PoE-powered devices, USB charging ports, and linear charger pre-regulation requiring stable component supply across extended temperature and voltage ranges.
Supply support for MP9928GF-P 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 efficiency, integration, and reliability in power management solutions.
The MP9928 belongs to MPS's high-voltage DC/DC controller product line, engineered for industrial, PoE, and automotive applications demanding wide input range, robust fault protection, and flexible light-load operation.
FAQ
What is the maximum allowable input voltage for MP9928GF-P?
The absolute maximum input voltage is 65V, but continuous operation is specified from 4V to 60V. Exceeding 60V may trigger overvoltage stress on internal circuitry despite the 65V rating, and the UVLO rising threshold is 5V - meaning startup requires ≥5V, though operation can continue down to 4V after startup.
How does the ILIM pin configure current limiting?
The ILIM pin selects one of three fixed current-sense voltage thresholds: 25mV (ILIM = GND), 50mV (ILIM = VCC1), or 75mV (ILIM = floating). This sets the peak inductor current trip point without external resistors - for example, with a 5mΩ sense resistor, floating ILIM yields 15A trip current (75mV ÷ 5mΩ).
Can MP9928GF-P operate without an external VCC2 supply?
Yes. When VCC2 is left open or held below 4.45V, the internal VCC1 regulator derives power from VIN. However, supplying 5–12V to VCC2 disables the VIN-based regulator, reducing power dissipation and improving overall efficiency - especially beneficial in high-input-voltage applications like 48V industrial systems.
What is the purpose of the SYNCO pin?
The SYNCO pin outputs a clock signal 180° out-of-phase with the internal oscillator or external sync clock, enabling interleaved operation with a second MP9928 or compatible controller. This reduces input and output ripple current by half and eases EMI filtering requirements in high-current applications.
How is soft-start duration controlled?
Soft-start duration is set by an external capacitor connected between SS pin and SGND. The SS pin sources a constant 2–6μA current (typ. 4μA) to charge this capacitor; the resulting ramp voltage controls the COMP pin's initial level, thereby limiting output voltage slew rate during startup.
Does MP9928GF-P support forced continuous conduction mode (CCM)?
Yes. Connecting the CCM/AAM pin to VCC1 or leaving it floating forces CCM operation. Pulling CCM/AAM low (≥480mV) enables AAM mode for improved light-load efficiency. The part automatically transitions between modes based on load and COMP voltage, eliminating need for external mode-control logic.
What thermal protection mechanisms are implemented?
MP9928GF-P includes thermal shutdown at 170°C with 20°C hysteresis and internal thermal foldback. When junction temperature exceeds 170°C, the device shuts down all gate drivers and enters hiccup mode - cycling on/off until temperature falls below 150°C - preventing permanent damage during sustained overload or inadequate heatsinking.
MP9928GF-P 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:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 60V
- Frequency - Switching:
- 100kHz ~ 1MHz
- Duty Cycle (Max):
- 99.5%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Phase Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
MP9928GF-P FAQ
1.How can I place an order for MP9928GF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP9928GF-P 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 MP9928GF-P reliable?
The price and inventory of MP9928GF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP9928GF-P is usually 5 days.
3.What payment methods are accepted for MP9928GF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP9928GF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP9928GF-P?
MP9928GF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP9928GF-P 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 MP9928GF-P?
For technical support, including MP9928GF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP9928GF-P requirements.
6.How does Aetrix verify that MP9928GF-P is sourced from the original manufacturer or authorized distributors?
All MP9928GF-P 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 MP9928GF-P meets industry standards.
7.What is the process for return or replacement of MP9928GF-P?
All MP9928GF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP9928GF-P, 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 MP9928GF-P part is unused and in its original packaging.
Return procedure for MP9928GF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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