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Monolithic Power Systems Inc. MP3421GG-P
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- Part No.:
- MP3421GG-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-PowerVFQFN
- Datasheet:
-
MP3421GG-P.pdf
- Description:
- IC REG BOOST ADJ 5.5A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,015
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Product details
Overview
MP3421GG-P from Monolithic Power Systems is a synchronous step-up DC-DC converter with true output disconnect, designed for battery-powered systems requiring regulated 5V output from low-input sources (as low as 1.9V). It delivers up to 2.1A at 5V from a 2.8V input, features 600kHz fixed-frequency current-mode control, integrated P/N-MOSFETs (15mΩ NMOS, 20mΩ PMOS), and 98% peak efficiency.
For engineers reviewing the MP3421GG-P datasheet, MP3421GG-P pinout, MP3421GG-P application, or MP3421GG-P equivalent, key selection criteria include its 5.5A switch-current limit, 43µA quiescent current in normal operation, true output disconnect during shutdown, internal soft-start and compensation, and QFN-14 (2mm×2mm) thermal performance (θJA = 80°C/W).
Technical Context
The MP3421GG-P implements fixed-frequency (600kHz) current-mode PWM control with internal slope compensation and an error amplifier referenced to 0.807V. Its startup sequence includes linear charge mode (0.2–0.7A current-limited pre-charge to 1.7V) before transitioning to closed-loop boost operation.
True output disconnect is achieved via an integrated P-channel MOSFET that fully isolates VOUT from VIN when EN is low-eliminating body diode leakage and enabling zero-output-voltage shutdown. Protection includes OCP (5.5A switch limit), SCP (linear charge fallback), OVP (7V trip), and thermal shutdown (150°C with 20°C hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.9V to 5.5V - supports single-cell Li-ion (2.8–4.2V) and alkaline/NiMH (up to 5.5V) inputs without external LDO pre-regulation. |
| Output Voltage Range | 2.5V to 5.5V - programmable via FB resistor divider; factory-configured for 5V in typical applications. |
| Switching Frequency | 600kHz (±100kHz over temp) - enables compact 1–2.2µH inductors and <22µF ceramic output capacitors. |
| Peak Switch Current Limit | 5.5A - sustains high pulse loads (e.g., USB port negotiation, flash LED bursts) without foldback. |
| Quiescent Current | 43µA at no load - extends battery runtime in standby or low-power monitoring modes. |
| Efficiency | Up to 98% at 2.1A/5V (VIN=2.8V) - minimizes thermal rise in space-constrained portable enclosures. |
| Thermal Resistance | θJA = 80°C/W - allows 1.56W continuous dissipation at +25°C ambient in standard 4-layer PCB layout. |
Pinout & Package
MP3421GG-P is housed in a thermally enhanced 14-pin QFN package (2mm × 2mm, 0.5mm pitch) with exposed thermal pad (PGND-connected). The package supports reflow soldering per JEDEC J-STD-020 and achieves θJC = 16°C/W to the thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 13 | PGND | Power ground return for high-current paths (SW, OUT); must be connected directly to thermal pad for optimal heat dissipation. |
| 3, 14 | SW | Switch node connecting internal NMOS drain and inductor; requires shortest possible PCB trace to minimize EMI and voltage overshoot. |
| 4, 5, 6 | OUT | Output power rail and PMOS drain; provides true disconnect from IN during shutdown; connects to output capacitor bank. |
| 7 | NC | No-connect pin; reserved for factory test; float or tie to PGND per layout guidelines. |
| 8 | EN | Active-high enable input (1.2V threshold); controls full system power state and initiates soft-start on rising edge. |
| 9 | IN | Main input supply (1.9–5.5V); powers startup bias circuitry and supplies gate drive until VOUT > VIN. |
| 10 | INA | Factory-bias auxiliary input; must be shorted to IN in all applications. |
| 11 | AGND | Analog ground reference for FB, EA, and internal references; separate from PGND but tied at single point near IC. |
| 12 | FB | Feedback input sensing output voltage divider; sets VOUT = 0.807V × (1 + R1/R2); supports 2.5–5.5V regulation. |
Key Features
| Feature | Design Value |
|---|---|
| True Output Disconnect | PMOS-based isolation eliminates body diode leakage, enabling zero-VOUT shutdown and external bias retention. |
| Integrated Synchronous Rectification | 15mΩ NMOS + 20mΩ PMOS switches replace external Schottky diode, improving efficiency by ~5–8% at medium loads. |
| Internal Soft-Start & Compensation | 2ms internal soft-start ramp and fully compensated loop reduce external components to only inductor, input/output caps, and FB divider. |
| Inrush & Short-Circuit Protection | Linear charge mode limits startup surge to ≤0.7A and forces graceful fallback to step-down or shutdown under sustained overload. |
| Ultra-Low Quiescent Current | 43µA operating IQ enables >1-year shelf life in battery-backed IoT sensors or remote controllers. |
Applications
| USB Power Delivery Accessories | Portable Medical Sensors |
|---|---|
Use Scenario: Compact power banks and juice packs delivering 5V/2.1A to smartphones via USB-A ports. IC Role / Device Role / Timing Role: Primary step-up regulator converting 2.8–4.2V Li-ion battery voltage to stable 5V USB output with load-step transient response <50µs. Use Value: 98% efficiency at full load reduces thermal stress in sealed plastic enclosures; true disconnect prevents battery drain when device is off. | Use Scenario: Battery-powered glucose meters and pulse oximeters requiring precise 5V rail for analog front-end and BLE radio. IC Role / Device Role / Timing Role: Single-chip power solution providing regulated 5V from coin cell or AAA batteries, with ultra-low IQ preserving measurement accuracy during sleep. Use Value: 43µA quiescent current extends battery life beyond 2 years; internal compensation ensures stable operation across temperature (-40°C to +85°C). |
| Wireless Audio Transmitters | Industrial Handheld Scanners |
Use Scenario: Bluetooth audio transmitters boosting 3.0–4.2V battery voltage to 5V for DAC, codec, and Class-D amplifier stages. IC Role / Device Role / Timing Role: High-efficiency boost converter supporting dynamic load steps (e.g., audio burst peaks) while maintaining <20mV output ripple. Use Value: 600kHz switching enables use of 1.5µH shielded inductor; 5.5A switch limit handles 3x peak current during amplifier clipping. | Use Scenario: Rugged barcode scanners powered by removable Li-ion packs, needing robust 5V rail for imager, laser, and MCU. IC Role / Device Role / Timing Role: Main power IC with OVP (7V), OTP (150°C), and SCP ensuring reliable operation during accidental short-circuit events in field use. Use Value: Thermal shutdown with 20°C hysteresis prevents latch-up; QFN-14 (2×2mm) footprint saves board space in ergonomic handheld form factor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 6.5A switch limit, 2.7V min input, 500kHz switching, no true output disconnect. | Lacks PMOS disconnect → residual VOUT leakage (~10µA) persists during shutdown; requires external diode for isolation. | Select when higher peak current (>5.5A) is required and output isolation is not critical. |
| RT9086AGQW | 4.5A switch limit, 1.8V min input, 1.5MHz switching, integrated soft-start only (no internal compensation). | Requires external compensation network; smaller 1.5MHz inductor but higher switching losses reduce efficiency at >1.5A loads. | Select for ultra-compact designs where 1.5MHz enables sub-1µH inductors and board area is more constrained than efficiency. |
Compared with MP3421GG-P, TPS61088RHLR offers higher current headroom but sacrifices true disconnect, while RT9086AGQW trades efficiency and integration for higher frequency and lower minimum input voltage-making MP3421GG-P optimal for 5V/2.1A portable applications demanding minimal BOM count, zero-shutdown leakage, and thermal resilience.
Availability
MP3421GG-P is available at Aetrix Electronics and suitable for battery-powered products, USB power supply units, and consumer electronic accessories requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP3421GG-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 mixed-signal ICs for power management, motion control, and automotive applications.
The MP3421 belongs to MPS's high-efficiency DC-DC converter product line, engineered specifically for space- and battery-constrained portable electronics requiring reliable boost conversion with minimal external components and robust protection.
FAQ
What is the minimum input voltage required for MP3421GG-P to start switching?
The MP3421GG-P starts up when input voltage exceeds the rising UVLO threshold of 1.3V (typical), but stable regulation begins only after the linear charge phase brings VOUT to ≥1.7V. For reliable 5V output, VIN must be ≥2.8V per the typical application design.
Does MP3421GG-P require external compensation components?
No. The MP3421GG-P integrates full loop compensation, eliminating the need for external Type-II or Type-III compensation networks. Only the FB resistor divider, input/output capacitors, and power inductor are required for basic operation.
How does true output disconnect function during shutdown?
When EN is pulled low, the internal P-channel MOSFET turns off completely, breaking the conductive path between IN and OUT. This prevents reverse current flow and holds VOUT at 0V (or external bias level), unlike conventional boost converters with body-diode leakage.
Can MP3421GG-P operate with input voltage higher than output voltage?
Yes - it enters step-down (buck) mode when VOUT < VIN + 0.3V, limiting peak switch current to 4A. However, this mode is intended only for startup or fault recovery; sustained operation in buck mode degrades efficiency and regulation and is not recommended for normal use.
What is the maximum recommended output capacitance for stability?
The MP3421GG-P is stable with ≥22µF ceramic output capacitance at the programmed VOUT. Larger values (e.g., 47–100µF) further reduce ripple and improve transient response but do not compromise stability due to internal compensation.
Is the NC pin (Pin 7) required to be grounded?
No. Pin 7 is a no-connect reserved for factory testing. The datasheet explicitly states it may be left floating or tied to PGND - neither choice affects electrical performance, though grounding simplifies layout and reduces potential noise coupling.
What thermal derating applies above +25°C ambient?
With θJA = 80°C/W, the MP3421GG-P's maximum continuous power dissipation decreases linearly: PD(MAX) = (150°C − TA)/80. At +65°C ambient, max dissipation drops to 1.06W - requiring careful layout and/or reduced load current to avoid thermal shutdown.
MP3421GG-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 14-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):
- 1.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 5.5A
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-QFN (2x2)
MP3421GG-P FAQ
1.How can I place an order for MP3421GG-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3421GG-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 MP3421GG-P reliable?
The price and inventory of MP3421GG-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3421GG-P is usually 5 days.
3.What payment methods are accepted for MP3421GG-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3421GG-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3421GG-P?
MP3421GG-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3421GG-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 MP3421GG-P?
For technical support, including MP3421GG-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3421GG-P requirements.
6.How does Aetrix verify that MP3421GG-P is sourced from the original manufacturer or authorized distributors?
All MP3421GG-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 MP3421GG-P meets industry standards.
7.What is the process for return or replacement of MP3421GG-P?
All MP3421GG-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3421GG-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 MP3421GG-P part is unused and in its original packaging.
Return procedure for MP3421GG-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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