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Monolithic Power Systems Inc. MP3428AGL-Z
- Part No.:
- MP3428AGL-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 22-PowerVFQFN
- Datasheet:
-
MP3428AGL-Z.pdf
- Description:
- IC REG BOOST ADJ 19A 22QFN
- Quantity:
- Payment:
- Shipping:
Inventory:27,996
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Product details
Overview
MP3428AGL-Z from Monolithic Power Systems is a 600kHz, current-mode synchronous boost converter with 3V–20V input range, 19A internal switch current limit, integrated 10mΩ low-side MOSFET, and input disconnect function for battery protection in power banks and Thunderbolt interfaces.
For engineers reviewing the MP3428AGL-Z datasheet, MP3428AGL-Z pinout, MP3428AGL-Z application, or MP3428AGL-Z equivalent, this device supports programmable input average current limiting, external soft-start and compensation, <1µA shutdown current, and thermal shutdown at 150°C - critical for compact, high-efficiency portable power designs.
Technical Context
The MP3428AGL-Z implements fixed-frequency peak-current-mode control with dual current-sensing options: internal sensing (CLDR = GND) for 19A peak switch current limiting, or external RSENSE-based average input current regulation (VCL = 54mV typ). Its synchronous rectification driver (SDR) operates from a bootstrap supply (BST), enabling >90% efficiency at 2A output in typical 3.3V-to-12V configurations.
It integrates programmable UVLO (2.68V rising threshold, 250mV hysteresis), output overvoltage protection (108% FB trip), and hiccup-mode SCP triggered by linear charge OCP (0.5ms blanking) or fast inductor current overshoot (>100mV/RSENSE). VDD is auto-switched between IN and OUT to maintain gate drive strength across wide VIN–VOUT differentials.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 3V to 20V - supports single-cell Li-ion up to 5S battery stacks and universal USB PD input rails. |
| Switching frequency | 600kHz ±15% - enables compact 1.5µH inductors and reduces EMI filtering burden in space-constrained layouts. |
| Internal switch RDS(on) | 10mΩ @ 24V - minimizes conduction loss in high-current paths; rated for 29A peak under derating. |
| Input average current limit | Programmable via RSENSE; VCL = 54mV typ → IIN(AVG) = 54mV / RSENSE - enables precise battery discharge control in power banks. |
| Shutdown current | <1µA - preserves battery life during system sleep in Bluetooth audio and POS terminals. |
| Thermal shutdown | 150°C with 25°C hysteresis - ensures safe operation under sustained 2A+ loads on 4-layer PCBs without forced airflow. |
| FB reference voltage | 1.225V ±1.2% - sets output voltage accuracy via resistor divider; supports 5V, 9V, 12V, and 20V outputs. |
Pinout & Package
MP3428AGL-Z is housed in a thermally enhanced QFN-22 package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad (Pin 16 AGND connected to EP). The package supports ≤2.6W continuous power dissipation at +25°C ambient (θJA = 48°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BST | Bootstrap supply | Powers SDR driver; requires ceramic capacitor from BST to SW; undervoltage lockout triggers if VBST < 4.3V. |
| 2 SDR | Synchronous rectifier gate driver | Complementary N-channel gate drive; requires low-VTH (<2.5V), low-QG MOSFET for >90% efficiency above 1A. |
| 3 OUT | Output voltage sense & VDD source | Feeds feedback divider and powers VDD when VOUT > VIN; must be decoupled with ≥22µF ceramic capacitance. |
| 4 EN | Enable with programmable UVLO | 1.33V turn-on threshold; 0.4V shutdown; supports external resistor divider to set custom input UVLO hysteresis. |
| 5 CLDR | Input disconnect MOSFET driver | Drives external high-side NMOS gate; floating or MOSFET-connected enables RSENSE-based average current limiting. |
| 6 SENSE | Current sense input | Monitors voltage drop across RSENSE (IN–SENSE); shorted to IN selects internal current sensing. |
| 7,8,19–21 SW | Power switch drain | High-current path for inductor and rectifier; multiple pins reduce trace resistance and thermal stress. |
| 9,10,17,18,22 PGND | Power ground return | Low-impedance return for switch current; must be tied to thermal pad and separated from AGND at single point. |
| 11 IN | Main input supply | Requires local 10µF X5R ceramic bypass; connects to RSENSE and CLDR for external current sensing. |
| 12 VDD | Internal bias supply | Powered from IN at startup, then from OUT; requires 2.2µF ceramic capacitor placed adjacent to pin. |
| 13 COMP | Loop compensation node | External RC network sets dominant pole/zero; clamped to VSS + 0.7V during soft-start to limit inrush. |
| 14 FB | Feedback input | Compares divided VOUT against 1.225V reference; 50nA bias current enables high-impedance dividers. |
| 15 SS | Soft-start timing | Charged by 7µA current; 0.65V threshold transitions from 150kHz start-up to full 600kHz operation. |
| 16 AGND | Analog ground reference | Reference for FB, COMP, SENSE; routed separately from PGND and connected at single star point near IC. |
Key Features
| Feature | Design Value |
|---|---|
| Input disconnect function | CLDR-driven high-side MOSFET isolation prevents battery drain during output short or shutdown - essential for unattended power banks. |
| Programmable input average current limit | VCL = 54mV sets precise IIN(AVG) via RSENSE, enabling fuel gauge compatibility and thermal-safe charging in portable devices. |
| External soft-start and compensation | SS pin controls ramp rate; COMP pin allows custom loop tuning for optimal transient response across 0.1–5A load steps. |
| Thermal shutdown with hysteresis | 150°C shutdown / 125°C restart prevents latch-up during sustained overload; validated on JEDEC 4-layer board. |
| Synchronous rectification support | SDR driver delivers fast rise/fall times (20ns/30ns) into 2.7nF load - enables >93% efficiency at 3.3V→12V/2A with low-QG MOSFET. |
Applications
| Thunderbolt Interface Power | USB-C Power Bank |
|---|---|
Use Scenario: Supplies regulated 20V rail from 3.3V or 5V host bus power to drive Thunderbolt 3/4 controller logic and SerDes lanes. IC Role / Device Role / Timing Role: Primary synchronous boost regulator with input disconnect to isolate host during cable hot-plug events. Use Value: Maintains stable 20V output under dynamic 0–3A load transients while limiting inrush to prevent host port brownout. |
Use Scenario: Steps up single-cell Li-ion (3.0–4.2V) to 5V/9V/12V USB-C PD output in compact portable chargers. IC Role / Device Role / Timing Role: High-current boost controller with programmable average input current limiting for battery discharge management. Use Value: Enables accurate 2.4A/3A output current control per port while preserving battery cycle life via 54mV current-sense threshold. |
| Bluetooth Audio DAC Supply | POS Terminal Display Backlight |
Use Scenario: Generates clean 5V rail from 3.3V system rail to power high-fidelity DAC and headphone amplifier in wireless earbuds. IC Role / Device Role / Timing Role: Low-noise, high-efficiency boost converter with <1µA shutdown current for extended standby battery life. Use Value: Delivers 500mA at >92% efficiency with minimal ripple (<20mVpp) to meet THD+N requirements of premium audio codecs. |
Use Scenario: Drives white LED strings (12V, 350mA) in retail point-of-sale displays powered from 5V USB or 3.3V embedded rail. IC Role / Device Role / Timing Role: Compact, thermally robust boost controller supporting PWM dimming interface via EN pin modulation. Use Value: Achieves 12V@350mA output in 3mm×4mm footprint with thermal shutdown preventing LED driver failure in enclosed kiosk enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT4801BZQW | 400kHz switching, 15A switch current limit, no input disconnect function, requires external bootstrap diode. | Lacks CLDR-driven input isolation - unsuitable for battery-depletion-critical power banks. | Prefer MP3428AGL-Z where input disconnect and 600kHz frequency are required for size-sensitive designs. |
| TPS61236RGER | 1.2MHz switching, 4.5A switch current, integrated Schottky, no programmable input current limit or CLDR pin. | Lower current rating and missing average current regulation - inadequate for >2A power bank outputs. | Choose MP3428AGL-Z for applications demanding >10A input current control and thermal robustness above 125°C ambient. |
Compared with RT4801BZQW and TPS61236RGER, MP3428AGL-Z uniquely combines 19A switch capability, programmable average input current limiting via CLDR/SENSE, and integrated input disconnect - making it the only option qualified for high-power, battery-isolated portable systems requiring both efficiency and safety compliance.
Availability
MP3428AGL-Z is available at Aetrix Electronics and suitable for Thunderbolt interface power, USB-C power banks, Bluetooth audio DAC supplies, and POS terminal display backlighting requiring stable component supply across production lifecycles.
Supply support for MP3428AGL-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 mixed-signal ICs for power management, motion control, and automotive applications.
The MP3428A belongs to MPS's wide-input, high-current synchronous boost converter product line, designed specifically for portable and battery-powered systems needing efficient voltage step-up with integrated protection and battery preservation features.
FAQ
What is the minimum recommended inductor value for MP3428AGL-Z in a 3.3V-to-12V application?
The datasheet specifies 1.5µH as the standard inductor value for 3.3V-to-12V/2A operation. Using a smaller inductor increases peak current stress and reduces efficiency; values below 1.2µH risk exceeding the 19A internal switch limit under worst-case duty cycle and temperature conditions. A shielded 1.5µH, 30A saturation inductor with ≤15mΩ DCR is recommended for thermal margin.
Can MP3428AGL-Z operate without an external synchronous rectifier MOSFET?
Yes - the SDR pin can be left floating to disable synchronous rectification, allowing use of an external Schottky diode. However, efficiency drops by 5–8% at 2A output due to diode forward voltage loss. The internal 10mΩ switch remains active, and all protections (OCP, SCP, thermal shutdown) function identically regardless of SDR configuration.
How is input disconnect implemented, and what MOSFET parameters are required?
Input disconnect is achieved by driving an external N-channel MOSFET's gate via the CLDR pin. The MOSFET must have VGS(th) < 2.5V, QG < 15nC, and RDS(on) ≤ 10mΩ at VGS = 4.5V. CLDR provides ~13µA gate charge current; a 100nF gate capacitor ensures reliable turn-on within 10µs. No external driver is needed for logic-level MOSFETs.
What is the purpose of the CLDR pin when connected directly to GND?
Connecting CLDR to GND selects internal current sensing, disabling external RSENSE and enabling fixed 19A peak inductor current limiting. This configuration eliminates sense resistor losses and layout sensitivity but removes programmable average input current control - suitable for fixed-load applications like display backlights where battery isolation is not required.
Does MP3428AGL-Z support output voltages above 20V?
No - the absolute maximum output voltage is 22V, and recommended operating VOUT is limited to VIN + 2V (max 22V at 20V input). Exceeding 22V risks damage to the internal 24V-rated SW FET and OUT pin. For >20V outputs, a two-stage architecture (e.g., MP3428AGL-Z followed by a buck-boost) is required.
How does the soft-start function interact with the input disconnect feature during power-up?
During soft-start, CLDR remains low until SS reaches 0.65V, ensuring the input MOSFET stays off until the output is fully regulated. This prevents inrush into uncharged output capacitors. Once SS crosses 0.65V, CLDR activates and the input MOSFET turns on synchronously with the first switching cycle - guaranteeing controlled, isolated startup even under heavy capacitive loads.
Is MP3428AGL-Z RoHS-compliant and halogen-free?
Yes - MP3428AGL-Z is lead-free, halogen-free, and fully compliant with EU RoHS Directive 2011/65/EU. The QFN-22 package uses matte tin plating, and all die attach, molding compound, and wire bond materials meet IPC/JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) and green material specifications.
MP3428AGL-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 22-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 22V
- Current - Output:
- 19A
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 22-QFN (3x4)
MP3428AGL-Z FAQ
1.How can I place an order for MP3428AGL-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3428AGL-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 MP3428AGL-Z reliable?
The price and inventory of MP3428AGL-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3428AGL-Z is usually 5 days.
3.What payment methods are accepted for MP3428AGL-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3428AGL-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3428AGL-Z?
MP3428AGL-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3428AGL-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 MP3428AGL-Z?
For technical support, including MP3428AGL-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3428AGL-Z requirements.
6.How does Aetrix verify that MP3428AGL-Z is sourced from the original manufacturer or authorized distributors?
All MP3428AGL-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 MP3428AGL-Z meets industry standards.
7.What is the process for return or replacement of MP3428AGL-Z?
All MP3428AGL-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3428AGL-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 MP3428AGL-Z part is unused and in its original packaging.
Return procedure for MP3428AGL-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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