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Monolithic Power Systems Inc. MP3428GL-Z
- Part No.:
- MP3428GL-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 22-PowerVFQFN
- Datasheet:
-
MP3428GL-Z.pdf
- Description:
- IC REG BOOST ADJ 17A 22QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,931
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Product details
Overview
MP3428GL-Z from Monolithic Power Systems is a 600kHz fixed-frequency, current-mode synchronous boost converter with 3V–20V input range, integrated 10mΩ low-side MOSFET, >17A switch-current limit, and external compensation for transient optimization. It delivers up to 97.5% efficiency in power banks and Thunderbolt interface supplies.
For engineers reviewing the MP3428GL-Z datasheet, MP3428GL-Z pinout, MP3428GL-Z application, or MP3428GL-Z equivalent, key selection criteria include internal/external current-sensing configuration, BST/SDR gate driver timing, programmable UVLO hysteresis, and thermal shutdown at 150°C with 25°C hysteresis.
Technical Context
The MP3428GL-Z implements peak-current-mode control with a 600kHz fixed switching frequency and supports both internal (MODE = GND) and external (MODE floating) current sensing. Its error amplifier features 300 V/V gain and 160 μA/V transconductance, with COMP pin enabling full loop compensation via external R-C network.
It integrates a 5V bootstrap driver (BST) powering an SDR output for synchronous rectification, while VDD auto-switches from VIN to VOUT when output exceeds input-enabling high efficiency at low VIN. Thermal shutdown triggers at 150°C with 25°C hysteresis, and UVLO is programmable via EN bias current (4.5μA sink).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 20V - supports wide-input portable and industrial DC sources including USB PD, battery packs, and POS rails. |
| Switching Frequency | 600kHz ±15% - enables compact magnetics and low-output-ripple designs without audible noise. |
| Switch Current Limit | 17A min - sustains high-power boost operation under transient load steps in power banks and fuel cell interfaces. |
| Efficiency | Up to 97.5% - achieved via 10mΩ internal FET and synchronous rectifier drive, reducing conduction losses. |
| FB Reference Voltage | 1.225V ±12mV - sets precise output regulation; used with resistor divider to configure VOUT from VIN to 22V. |
| Shutdown Current | <1μA - ensures ultra-low quiescent drain in battery-backed systems during standby. |
| Thermal Shutdown | 150°C with 25°C hysteresis - protects die integrity during overload or poor PCB thermal design. |
| UVLO Threshold | 2.68V rising, 250mV hysteresis - prevents erratic startup during brownout; programmable via EN resistor network. |
Pinout & Package
MP3428GL-Z is housed in a thermally enhanced 22-pin QFN package measuring 3mm × 4mm with exposed thermal pad (PGND-connected). The package supports high-current routing and efficient heat dissipation in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | Bootstrap supply | Powers SDR driver; requires external capacitor between BST and SW; clamped at ~5V for reliable gate drive. |
| SDR (Pin 2) | Synchronous rectifier driver | Complementary gate signal for external N-MOSFET; 3V–5V compatible; must float if diode rectification used. |
| OUT (Pin 3) | Output voltage sampling | Provides feedback path for VDD bootstrapping and output voltage sensing; connects to BST capacitor and FB divider top node. |
| EN (Pin 4) | Enable control | Active-high logic input; 1.33V turn-on threshold; sinks 4.5μA to enable programmable UVLO hysteresis. |
| MODE (Pin 5) | Current-sense mode select | GND = internal sensing; floating = external RSENSE; configures protection mechanism (peak vs. average current limit). |
| SENSE (Pin 6) | External current sense input | Measures voltage drop across external shunt; used only when MODE is floating; sets 54mV average current limit threshold. |
| SW (Pins 7,8,19,20,21) | Power switch node | Drain of internal 10mΩ MOSFET; connects to inductor and synchronous rectifier; multiple pins reduce trace resistance and thermal stress. |
| PGND (Pins 9,10,17,18,22) | Power ground | High-current return path for SW, IN, and SDR; separate from AGND to minimize noise coupling into feedback loop. |
| IN (Pin 11) | Main input supply | Primary DC input connection; requires local 2×22μF ceramic bypassing to handle high di/dt ripple current. |
| VDD (Pin 12) | Internal bias rail | Powered from IN at startup, then from OUT; decoupled with ≥2.2μF ceramic cap near pin to stabilize gate drivers. |
| COMP (Pin 13) | Compensation node | Error amplifier output; connects to RC network for loop stability; clamped at 1.8V during soft-start. |
| FB (Pin 14) | Feedback input | Monitors output via resistor divider; reference voltage 1.225V; high-impedance input (<50nA bias) minimizes divider loading. |
| SS (Pin 15) | Soft-start control | Charged by 7μA internal current source; controls ramp rate of COMP voltage and switching frequency to limit inrush. |
| AGND (Pin 16) | Analog ground | Reference for FB, COMP, and internal error amp; must be isolated from PGND except at single-point star ground. |
Key Features
| Feature | Design Value |
|---|---|
| Optional current-sensing topology | Selectable internal (MODE=GND) or external (MODE floating) sensing - enables trade-off between integration and precision in high-current designs. |
| Programmable UVLO with hysteresis | Configurable start-up threshold and dropout gap via EN resistor divider - eliminates repeated cycling during marginal input conditions. |
| External soft-start and compensation | SS pin accepts capacitor for controlled ramp; COMP pin supports full Type-II/III compensation - ensures stable regulation across line/load transients. |
| Synchronous rectifier driver (SDR) | 5V gate drive with 20ns rise/30ns fall time - enables use of low-RDS(on) N-MOSFETs to replace Schottky diodes and improve efficiency above 2A. |
| Auto-switching VDD supply | VDD sourced from OUT when VOUT > VIN - maintains high-side driver performance and low RDS(on) even at 3V input, critical for low-VIN boost. |
| Thermal and overcurrent protection | 150°C shutdown with 25°C hysteresis + hiccup-mode average-current limiting (1.1ms blank time) - provides robust fault recovery without latch-up. |
Applications
| Thunderbolt Interface Power | Portable Power Bank |
|---|---|
Use Scenario: Supplies regulated 12V/2.1A to Thunderbolt 3 host controllers requiring stable, low-noise boost from 5V USB-C input. IC Role / Device Role / Timing Role: Primary synchronous boost regulator with programmable soft-start and external compensation to meet stringent EMI and transient response specs. Use Value: Delivers 97.5% efficiency at 2A load and suppresses output ripple below 20mVpp using three 22μF ceramic output caps - meeting Thunderbolt PHY power integrity requirements. | Use Scenario: Enables dual-cell Li-ion (6–8.4V) to 12V/3A boost for fast-charging USB-PD power banks with minimal board area. IC Role / Device Role / Timing Role: High-current boost controller with 17A switch limit and thermal foldback - sustains continuous 3A output under ambient temperatures up to 60°C. Use Value: Integrated 10mΩ FET and SDR driver eliminate external MOSFET and reduce BOM count by 2 components versus discrete solutions - lowering cost and layout complexity. |
| Notebook Display Backlight Supply | Fuel Cell Auxiliary Power |
Use Scenario: Generates 19V/1.5A from 12V system rail to drive LED backlight strings in ultrabooks with tight thermal envelopes. IC Role / Device Role / Timing Role: Fixed-frequency current-mode regulator with external compensation - allows tuning loop bandwidth to reject 100Hz ripple from buck-derived 12V bus. Use Value: 600kHz switching enables <2.2μH inductor size and reduces EMI filter footprint by 40% versus 300kHz alternatives - easing notebook mechanical integration. | Use Scenario: Boosts variable 4–16V output from PEM fuel cell stack to stable 20V for DC-DC conversion to 48V telecom bus. IC Role / Device Role / Timing Role: Wide-input, high-reliability boost converter with 20V absolute max rating and 150°C thermal shutdown - tolerates fuel cell voltage sag and thermal drift. Use Value: Programmable UVLO and 25°C thermal hysteresis prevent nuisance shutdown during fuel cell warm-up cycles - improving system uptime in remote deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT4801BZSP | 4.5V–36V input, 5A switch limit, no external current-sense option, integrated MOSFETs only | Limited to mid-power apps (<10W); lacks MODE-selectable sensing and SDR flexibility | Choose for simpler 5V-to-12V boost where 17A headroom and external MOSFET control are unnecessary. |
| TPS61236PRGTR | 1.8V–5.5V input, 4A switch limit, fixed 1.2MHz freq, no BST/SDR driver | Optimized for single-cell Li-ion; cannot support 20V input or synchronous rectification | Select only for ultra-low-VIN portable apps where MP3428GL-Z's wide input and high current are over-spec. |
Compared with RT4801BZSP and TPS61236PRGTR, MP3428GL-Z uniquely combines 20V input capability, 17A current handling, and configurable current sensing - making it the sole fit for high-power, wide-input portable systems requiring field-serviceable protection schemes.
Availability
MP3428GL-Z is available at Aetrix Electronics and suitable for Thunderbolt interface power, portable power bank designs, and fuel cell auxiliary supplies requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MP3428GL-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 core expertise in DC-DC conversion, motor drivers, and LED lighting controllers.
The MP3428 product line targets high-efficiency, high-current portable power applications - designed specifically to replace discrete boost stages in power banks, notebooks, and interface power supplies with integrated, thermally optimized solutions.
FAQ
What is the minimum recommended input voltage for reliable startup?
The MP3428GL-Z guarantees operation down to 3V input, but reliable startup requires VIN ≥ 3.3V when using internal current sensing (MODE = GND) due to VDD bootstrap dependency on OUT voltage. Below 3.3V, external BST assist via Schottky diode from 5V rail is advised to maintain SDR functionality.
Can the MP3428GL-Z operate in discontinuous conduction mode (DCM)?
Yes - the MP3428GL-Z automatically enters pulse-skipping mode (PSM) at light loads, reducing switching frequency and minimizing quiescent current to <1μA. DCM behavior is inherent in its current-mode architecture and does not require external configuration.
How is the external current-sense resistor value calculated?
For external sensing (MODE floating), RSENSE is selected using VCL = 54mV (typical) and desired average current limit ICL: RSENSE = VCL/ICL. Example: For 10A limit, RSENSE = 54mV/10A = 5.4mΩ - standard 5mΩ 0805 shunt meets this with 10% tolerance.
What happens if MODE is pulled to GND through a resistor instead of direct connection?
Connecting MODE to GND via resistor violates the datasheet requirement and may cause unreliable internal current-sense activation. The device expects a hard GND tie before power-on; resistive pull-down can delay or prevent proper initialization, leading to startup failure or inconsistent current limiting.
Is the BST capacitor required even when using diode rectification?
Yes - the BST capacitor (typically 0.1μF X7R ceramic) remains mandatory regardless of rectification method, as it supplies gate drive for the internal low-side MOSFET. Omitting it causes SW node instability and potential shoot-through, even with external diode.
How does the MP3428GL-Z handle output short-circuit conditions?
Under short-circuit, the device enters hiccup mode after 1.1ms of average overcurrent detection (VSENSE > 54mV), disabling switching for ~60ms before retrying. This limits power dissipation to safe levels without requiring external circuitry - protecting both IC and input source.
What is the maximum allowable output voltage?
The absolute maximum rated voltage on OUT, SW, and SENSE pins is +24V. However, recommended operating VOUT is limited to 22V per datasheet specifications - exceeding this risks overstress during transients or thermal runaway, especially at high ambient temperatures.
MP3428GL-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 22-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 17A (Switch)
- Frequency - Switching:
- 450kHz ~ 690kHz
- Synchronous Rectifier:
- Both
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 22-QFN (3x4)
MP3428GL-Z FAQ
1.How can I place an order for MP3428GL-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3428GL-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 MP3428GL-Z reliable?
The price and inventory of MP3428GL-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3428GL-Z is usually 5 days.
3.What payment methods are accepted for MP3428GL-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3428GL-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3428GL-Z?
MP3428GL-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3428GL-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 MP3428GL-Z?
For technical support, including MP3428GL-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3428GL-Z requirements.
6.How does Aetrix verify that MP3428GL-Z is sourced from the original manufacturer or authorized distributors?
All MP3428GL-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 MP3428GL-Z meets industry standards.
7.What is the process for return or replacement of MP3428GL-Z?
All MP3428GL-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3428GL-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 MP3428GL-Z part is unused and in its original packaging.
Return procedure for MP3428GL-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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