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Monolithic Power Systems Inc. MP9928GL-Z
- Part No.:
- MP9928GL-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TFQFN Exposed Pad
- Datasheet:
-
MP9928GL-Z.pdf
- Description:
- IC REG CTRLR BUCK 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:16,092
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Product details
Overview
MP9928GL-Z from Monolithic Power Systems is a high-voltage synchronous step-down controller IC designed for industrial and PoE power conversion, supporting 4V–60V input, driving dual N-channel MOSFETs, delivering up to 7A output current with 0.8V ±1.5% feedback reference, and featuring programmable 100–1000kHz switching frequency and AAM/CCM mode selection.
For engineers reviewing the MP9928GL-Z datasheet, MP9928GL-Z pinout, MP9928GL-Z application, or MP9928GL-Z equivalent, key selection considerations include its dual-gate drive capability, 99.5% max duty cycle for low-dropout operation, precision OVP/OCP/thermal shutdown protection, and flexible VCC1 sourcing via VIN or external VCC2 supply.
Technical Context
The MP9928GL-Z implements current-mode PWM control with cycle-by-cycle current limiting and slope compensation, using an internal 0.8V reference and error amplifier with 70dB DC gain to regulate output voltage via external FB divider. Its oscillator supports resistor-programmed or externally synchronized operation (100–1000kHz), with 180° out-of-phase SYNCO output for multi-phase coordination.
It integrates dual gate drivers (TG/BG) with 2Ω/1Ω pull-up/pull-down resistances, dead time of 60ns, and bootstrap (BST) circuitry with UVLO (3.05V rising). Protection includes 110–120% VFB overvoltage threshold, thermal shutdown at 170°C, and selectable current limit (25/50/75mV) via ILIM pin configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - Enables direct use in 12V/24V/48V industrial and automotive systems without pre-regulation. |
| Feedback Reference Voltage | 0.800V ±1.5% - Sets precise output regulation point; tolerance ensures ≤±12mV error at 5V output. |
| Switching Frequency Range | 100kHz to 1000kHz - Adjustable via external resistor or sync clock to avoid EMI-sensitive bands. | Max Duty Cycle | 99.5% - Supports ultra-low dropout operation during cold-crank or brownout conditions. |
| Current Limit Threshold Options | 25mV / 50mV / 75mV - Configurable via ILIM pin (GND/VCC1/floating) to match MOSFET RDS(on) and inductor DCR. |
| Power Good Accuracy | ±10% of VFB - PG asserts low when output deviates beyond 85–112.5% of nominal, enabling reliable system sequencing. |
| Thermal Shutdown Threshold | 170°C with 20°C hysteresis - Protects die during overload or poor heatsinking; automatic recovery after cooldown. |
Pinout & Package
MP9928GL-Z is housed in a thermally enhanced QFN-20 package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad (EP), optimized for high-power density and efficient PCB heat dissipation in compact industrial power supplies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Main input supply connection | Accepts 4–60V; requires local ceramic decoupling to suppress high di/dt transients. |
| EN/SYNC (Pin 2) | Enable and synchronization input | 1.22V enable threshold with 130mV hysteresis; doubles as external clock input for noise-sensitive designs. |
| VCC2 (Pin 3) | External bias supply input | Enables VCC1 regulation from external 5–12V source, reducing power loss vs. VIN-derived bias. |
| VCC1 (Pin 4) | Internal bias rail output | 5V regulated output; must be decoupled with 1–4.7µF ceramic capacitor to SGND. |
| SGND (Pin 5) | Signal ground reference | Low-noise analog ground for FB, COMP, SS; must be separated from PGND to minimize noise coupling. |
| SS (Pin 6) | Soft-start timing control | Current-source pin (2–6µA) charging external capacitor to control startup ramp rate and prevent overshoot. |
| 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 divided output against 0.8V reference; 10nA input bias enables high-resistor-divider designs. |
| CCM/AAM (Pin 9) | Mode selection control | Configures CCM (float/VCC1) or AAM (resistor-to-GND, VAAM ≥480mV) for light-load efficiency optimization. |
| FREQ (Pin 10) | Frequency programming input | Resistor-to-SGND sets switching frequency; also sources 9.2µA for AAM mode calculation. |
| PG (Pin 11) | Open-drain power-good indicator | Pulls low if output falls outside ±10% window; 25µs delay ensures glitch immunity during transients. |
| ILIM (Pin 12) | Current limit threshold select | Three fixed sense voltages (25/50/75mV) set peak inductor current limit without external components. |
| SYNCO (Pin 13) | Synchronization clock output | 180° out-of-phase clock for interleaved dual-phase operation; goes high-Z during fault or low-dropout mode. |
| SENSE− (Pin 14) | Negative current sense input | Completes differential sensing path; common-mode range 0–24V supports high-side or low-side sensing. |
| SENSE+ (Pin 15) | Positive current sense input | Differential pair with SENSE−; rejects common-mode noise for accurate cycle-by-cycle current limiting. |
| PGND (Pin 16) | Power ground return | High-current return for BG driver and VCC1 regulator; must connect directly to VCC1 capacitor negative terminal. |
| BG (Pin 17) | Bottom gate driver output | Drives low-side N-MOSFET gate; 1Ω pull-down ensures fast turn-off and prevents shoot-through. |
| SW (Pin 18) | Switch node | High dv/dt node connecting inductor, HS-FET drain, and BST capacitor; requires tight layout to minimize ringing. |
| TG (Pin 19) | Top gate driver output | Floating driver for HS-FET gate; powered by BST capacitor; 2Ω pull-up enables fast turn-on under high load. |
| BST (Pin 20) | Bootstrap supply | Charged via internal diode from VCC1 during LS-FET conduction; maintains TG drive during HS-FET on-time. |
Key Features
| Feature | Design Value |
|---|---|
| Dual N-channel MOSFET gate drivers | Integrated TG/BG drivers with 2Ω/1Ω on-resistance and 60ns dead time eliminate need for external drivers and reduce BOM count. |
| Programmable AAM/CCM operation | Selectable light-load mode via CCM/AAM pin: AAM reduces switching losses below ~10% load while maintaining regulation accuracy. |
| 180° out-of-phase SYNCO output | Enables seamless interleaving with second MP9928 or compatible controller for reduced input/output ripple and smaller filter components. |
| Flexible VCC1 sourcing (VIN or VCC2) | VCC2 input allows powering VCC1 from a secondary rail (e.g., post-regulated 5V), cutting quiescent loss by >50% vs. VIN-only bias. |
| Precision overvoltage protection | 110–120% VFB OVP with 10% hysteresis provides robust safeguard against feedback divider failure or transient surges. |
Applications
| Industrial 24V Power Supply | PoE-PD Power Conversion |
|---|---|
Use Scenario: Regulating 24V input to 5V/3.3V for PLC I/O modules and sensor interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: Primary step-down controller managing dual N-MOSFET power stage, providing stable output under wide load and temperature variation. Use Value: 99.5% max duty cycle sustains regulation during 24V brownouts; AAM mode cuts no-load quiescent current to 250–350μA. | Use Scenario: Converting IEEE 802.3af/at PoE input (37–57V) to isolated 12V/5V rails for IP cameras and VoIP phones. IC Role / Device Role / Timing Role: High-voltage buck controller interfacing with PoE interface ICs (e.g., MPS MP8017), handling variable input and dynamic load steps. Use Value: 60V absolute max input rating accommodates PoE surge transients; SYNC input enables EMI spread-spectrum alignment with Ethernet PHY clocks. |
| USB DCP Charging Port | Linear Charger Bias Supply |
Use Scenario: Providing 5V/3A dedicated charging port compliant with USB BC1.2 specification in automotive infotainment head units. IC Role / Device Role / Timing Role: Constant-voltage controller regulating output to 5.0V ±0.25V, coordinating with USB ID detection logic via EN pin. Use Value: 0.8V FB reference with ±1.5% tolerance ensures <±12.5mV output error; PG signal confirms valid 5V before enabling downstream USB switch. | Use Scenario: Generating clean 5V bias for linear battery chargers (e.g., TI BQ2407x) in portable medical devices requiring low-noise, low-ripple supply. IC Role / Device Role / Timing Role: Pre-regulator supplying stable 5V to charger IC's VIN, isolating charger from noisy main 12V/24V bus. Use Value: Low 750–1000μA quiescent current extends standby battery life; soft-start (SS pin) prevents inrush into charger input capacitance. |
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 external VREF; lower max duty cycle (93%). | Preferred for >60V inputs (e.g., telecom -48V systems); lacks AAM mode, resulting in higher light-load current. | Choose LM5116 for ultra-high-input applications where MP9928GL-Z's 60V limit is insufficient. |
| RT7297CZSP | 4.5–60V input; integrated high-side driver only; requires external low-side driver; no SYNCO output. | Suitable for cost-sensitive single-MOSFET designs; no interleaving support; less flexible current sensing. | Choose RT7297C for simpler, lower-cost topologies where dual-N-channel drive and phase synchronization are unnecessary. |
Compared with LM5116PWPR and RT7297CZSP, MP9928GL-Z uniquely combines dual-N-channel drive, VCC2 bias flexibility, AAM light-load optimization, and 180° SYNCO-making it optimal for compact, high-efficiency industrial and PoE-PD designs demanding full feature integration.
Availability
MP9928GL-Z is available at Aetrix Electronics and suitable for industrial control systems, PoE-powered devices, USB charging ports, and linear charger bias supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MP9928GL-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP9928 product line targets high-voltage DC/DC controller applications in industrial, PoE, and automotive markets, emphasizing wide input range, integrated gate drive, and adaptive efficiency modes for rugged, space-constrained power systems.
FAQ
What is the minimum recommended input voltage for reliable startup of MP9928GL-Z?
The MP9928GL-Z has an input UVLO rising threshold of 4.5–5.0V. Startup requires VIN ≥5.0V; once operating, it sustains regulation down to 4.0V due to hysteresis. Below 4.0V, the device shuts down and will not restart until VIN exceeds 5.0V again.
How does the ILIM pin configuration affect current limit accuracy and design flexibility?
ILIM pin state selects fixed current sense thresholds: GND = 25mV, VCC1 = 50mV, floating = 75mV. This eliminates calibration components but fixes gain; designers must select MOSFET RDS(on) or sense resistor to match the chosen threshold for desired current limit (e.g., 75mV with 10mΩ yields 7.5A).
Can MP9928GL-Z operate without an external VCC2 supply, and what is the impact on efficiency?
Yes - with VCC2 unconnected or <4.45V, MP9928GL-Z powers VCC1 from VIN via internal LDO. This increases quiescent current (750–1000μA) and reduces efficiency at high VIN. Using VCC2 = 5–12V cuts IQ to 25–40μA and improves full-load efficiency by 0.5–1.2%.
What is the functional difference between AAM and CCM modes, and how is mode selection implemented?
AAM (Advanced Asynchronous Mode) disables switching at light loads to reduce gate charge loss, improving efficiency below ~10% load. CCM forces continuous switching. Mode is selected by pulling CCM/AAM pin low (<480mV) for AAM or leaving it floating/VCC1-connected for CCM - no external logic required.
Is MP9928GL-Z RoHS-compliant and lead-free, and what is its moisture sensitivity level (MSL)?
Yes, MP9928GL-Z is RoHS-compliant, lead-free, and halogen-free per MPS quality assurance standards. It is rated MSL-3 (floor life 168 hours at 30°C/60% RH), requiring bake-out per J-STD-020 prior to reflow if exposed beyond that period.
How does the SYNCO output behave during fault conditions or low-dropout operation?
During faults (OVP, OCP, thermal shutdown) or low-dropout mode, SYNCO outputs a DC high or high-impedance state - not a clock. It resumes 180° out-of-phase toggling only during normal CCM/DCM operation, ensuring predictable behavior in multi-phase systems during anomalies.
What is the maximum achievable output current using MP9928GL-Z, and what limits it?
Maximum output current is determined by external components: MOSFET RDS(on), inductor saturation current, and thermal design. With typical 2.5mΩ/5mΩ MOSFETs and 4.7µH inductor, 7A is achievable. The 75mV current limit threshold (ILIM floating) sets peak inductor current; average output depends on duty cycle and ripple.
MP9928GL-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:
- 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-QFN (3x4)
MP9928GL-Z FAQ
1.How can I place an order for MP9928GL-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP9928GL-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 MP9928GL-Z reliable?
The price and inventory of MP9928GL-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP9928GL-Z is usually 5 days.
3.What payment methods are accepted for MP9928GL-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP9928GL-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP9928GL-Z?
MP9928GL-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP9928GL-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 MP9928GL-Z?
For technical support, including MP9928GL-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP9928GL-Z requirements.
6.How does Aetrix verify that MP9928GL-Z is sourced from the original manufacturer or authorized distributors?
All MP9928GL-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 MP9928GL-Z meets industry standards.
7.What is the process for return or replacement of MP9928GL-Z?
All MP9928GL-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP9928GL-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 MP9928GL-Z part is unused and in its original packaging.
Return procedure for MP9928GL-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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