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Monolithic Power Systems Inc. MP3221GJ-P
- Part No.:
- MP3221GJ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MP3221GJ-P.pdf
- Description:
- IC REG BOOST ADJ 2.7A TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,061
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Product details
Overview
MP3221GJ-P from Monolithic Power Systems is a 1.2MHz, current-mode step-up DC-DC converter with integrated 88mΩ MOSFET and true input-output disconnect capability via external PMOS control. It operates from 2.5V–6V input, delivers up to 1A at 5V from 3V supply, and features 270µA quiescent current and internal soft-start. Used in battery-powered portable media players for regulated 5V rail generation.
For engineers reviewing the MP3221GJ-P datasheet, MP3221GJ-P pinout, MP3221GJ-P application, or MP3221GJ-P equivalent, key selection criteria include its 1.2MHz fixed-frequency operation, 2.7A internal switch current limit, FAULT-driven PMOS disconnect logic, UVLO (2.2V), and TSOT23-6 thermal performance (θJA = 220°C/W).
Technical Context
The MP3221GJ-P implements a constant-frequency peak-current-mode boost architecture with slope compensation to suppress subharmonic oscillation above 50% duty cycle. Its error amplifier compares 0.796V FB reference against resistor-divider feedback to regulate output voltage.
Startup sequencing is controlled by the FAULT pin, which ramps the external PMOS gate slowly until VIN − 1.8V is reached; only then does regulation begin. Fault protection triggers FAULT pin pull-up when FB drops to 150mV, forcing PMOS turn-off during short-circuit events post-startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.2 MHz fixed - enables compact magnetics and low-profile 2.2µH inductor selection. |
| Input Voltage Range | 2.5V to 6V - supports single-cell Li-ion (3.0–4.2V) and triple-cell alkaline/NiMH (3.6–4.5V) sources. |
| Output Voltage Range | 3V to 6V - programmable via FB resistor divider; typical 5V output at 1A load from 3V input. |
| Internal Switch Current Limit | 2.7 A - limits peak inductor current to maintain regulation under transient loads and prevent MOSFET overstress. |
| Quiescent Current | 270 µA - minimizes battery drain during active regulation; shutdown current <0.15 µA enables long standby life. |
| FB Reference Voltage | 0.796 V ±1.2% - sets output accuracy; used with external resistive divider to define VOUT = 0.796 × (1 + R1/R2). |
| Thermal Shutdown Threshold | 150 °C - protects die during overload or poor PCB thermal design; 20°C hysteresis prevents cycling. |
Pinout & Package
The MP3221GJ-P is housed in a 6-pin TSOT23-6 package (2.9mm × 1.6mm × 0.85mm), optimized for space-constrained portable designs. Thermal resistance θJA = 220°C/W on standard 4-layer JEDEC PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Power switch drain node | Connects to inductor and rectifier cathode; carries high di/dt switching current; requires tight layout to minimize ringing. |
| 2 GND | Analog and power ground reference | Single-point return for IN, FB, EN, and FAULT; must tie directly to power ground plane beneath IC. |
| 3 FB | Feedback input | Senses output voltage via resistor divider; 0.796V reference sets regulation point; sensitive to noise-keep trace short and away from SW. |
| 4 EN | Enable control input | Logic-high (>1.3V) enables regulation; logic-low (<0.5V) disables IC and activates FAULT-driven disconnect; internal pull-down. |
| 5 IN | Main input supply | Accepts 2.5–6V; requires local ≥10µF ceramic bypass capacitor placed adjacent to IN/GND pins. |
| 6 FAULT | PMOS gate driver output | Drives external P-channel MOSFET gate; ramps up at startup, pulls high during SCP/fault to turn off PMOS and isolate VOUT from VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 88mΩ MOSFET | Reduces conduction loss and eliminates external high-side switch; supports >90% efficiency at 1A/5V from 3V input. |
| True Input-Output Disconnect | Enables full VOUT discharge and <0.15µA shutdown current by turning off external PMOS-critical for battery longevity. |
| Internal Soft Start & Compensation | Eliminates need for external compensation network or soft-start capacitor; reduces BOM count and board area. |
| Short-Circuit Protection (SCP) | Detects FB ≤150mV post-startup and forces FAULT pin high to disconnect PMOS-prevents battery drain during output shorts. |
| UVLO with 225mV Hysteresis | Prevents erratic startup below 2.2V and ensures clean enable/disable transition across battery discharge curve. |
Applications
| Portable Media Players | Wireless Peripherals |
|---|---|
Use Scenario: Powering USB audio DACs and OLED displays from single Li-ion cell in compact handheld players. IC Role / Device Role / Timing Role: Step-up regulator generating stable 5V rail; FAULT pin controls PMOS to isolate display backlight during sleep mode. Use Value: Enables 5V peripheral compatibility while extending battery runtime via <0.15µA shutdown current and 91% peak efficiency. | Use Scenario: Supplying 5V to Bluetooth audio transmitters and wireless mice operating from AAA alkaline cells. IC Role / Device Role / Timing Role: Boost converter delivering 1A at 5V from 3×AAA (4.5V fresh → 3.0V depleted); UVLO prevents brownout during battery sag. Use Value: Maintains full functionality down to 2.5V input; internal compensation avoids tuning delays in high-volume consumer production. |
| Smartphones (Auxiliary Rails) | Tablets (Camera Flash Drivers) |
Use Scenario: Generating auxiliary 5V for USB OTG accessories or fingerprint sensors in smartphones with limited PCB real estate. IC Role / Device Role / Timing Role: Compact 6-pin boost IC providing isolated 5V rail; FAULT pin ensures no backfeed into main PMIC during suspend. Use Value: TSOT23-6 footprint saves >30% area vs. QFN alternatives; 1.2MHz switching allows use of 2.2µH inductor <1.0mm height. | Use Scenario: Driving white LED flash circuits requiring 5V/1.5A pulses from 3.7V Li-ion battery in tablets. IC Role / Device Role / Timing Role: High-current boost stage with 2.7A switch limit; thermal shutdown (150°C) prevents overheating during burst-mode flash operation. Use Value: Delivers required peak current without external current-sense resistor; integrated OVP/OTP simplifies safety certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS610992RTER | Lower IQ (200nA shutdown, 400nA operating); no integrated disconnect driver; requires external MOSFET control logic. | Lacks FAULT-driven PMOS gate drive; cannot achieve true output discharge without added circuitry. | Select when ultra-low standby power dominates over board area and fault autonomy. |
| RT9293BGJ5 | Higher switching frequency (1.5MHz); 2A switch limit; no FAULT pin or disconnect capability; smaller 5-pin SOT23 package. | No input-output isolation function; unsuitable for applications requiring full VOUT discharge or SCP-triggered disconnect. | Select for cost-sensitive, non-isolating boost needs where 1.5MHz enables smaller inductors but FAULT logic is unnecessary. |
Compared with TPS610992RTER and RT9293BGJ5, the MP3221GJ-P uniquely integrates both high-current capability (2.7A) and autonomous FAULT-driven PMOS control-enabling true output isolation, sub-µA shutdown, and robust SCP response without external logic.
Availability
MP3221GJ-P is available at Aetrix Electronics and suitable for portable media players, wireless peripherals, and smartphone auxiliary rail designs requiring stable component supply, consistent parametric performance, and RoHS-compliant packaging.
Supply support for MP3221GJ-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 design centers in the US, China, and Taiwan.
The MP3221 belongs to MPS's high-efficiency DC-DC boost converter product line, engineered specifically for space- and battery-life-constrained portable electronics requiring integrated disconnect and minimal external components.
FAQ
What is the purpose of the FAULT pin on the MP3221GJ-P?
The FAULT pin drives the gate of an external P-channel MOSFET to physically disconnect the output from the input during shutdown or short-circuit conditions. It ramps up slowly at startup to avoid false SCP triggering, then pulls high to turn off the PMOS if FB falls to 150mV-ensuring true output isolation and <0.15µA shutdown current.
Can the MP3221GJ-P operate from a single 1.5V alkaline cell?
No. The MP3221GJ-P requires a minimum input voltage of 2.5V per Absolute Maximum Ratings and Recommended Operating Conditions. It is designed for three-cell alkaline (4.5V nominal) or single-cell Li-ion (3.0–4.2V), not 1.5V primary cells.
What inductor value is recommended for a 5V/1A output from 3.3V input?
A 2.2µH shielded power inductor is recommended per the datasheet and typical application circuit. This value balances ripple current (≈35% of peak input current), size, saturation margin, and efficiency-validated for 1.2MHz operation with <100mVpp output ripple at full load.
Does the MP3221GJ-P require an external Schottky diode?
Yes. The MP3221GJ-P uses an asynchronous boost topology and requires an external Schottky diode (e.g., 1N5819 or equivalent) between SW and VOUT. The diode must withstand ≥5V reverse voltage and conduct ≥1.2A average current with low forward voltage to maintain efficiency.
How does the MP3221GJ-P handle thermal overload?
It incorporates a junction temperature sensor that triggers thermal shutdown at 150°C. Once activated, regulation halts, the FAULT pin pulls high to disconnect output, and the device remains latched off until junction temperature falls by ≥20°C hysteresis. No automatic restart occurs-EN must be cycled.
Is the FB voltage adjustable, and what tolerance does it have?
Yes, FB voltage is fixed at 0.796V ±1.2% (0.780V to 0.812V) and sets output via external resistor divider. This precision reference enables ±2% output voltage accuracy over line/load/temperature when using 1% resistors, critical for USB-compliant 5V rails.
What is the maximum duty cycle limitation, and why does it matter?
The MP3221GJ-P supports up to 90% duty cycle. This enables high step-up ratios (e.g., 2.5V→6V = 2.4×) while maintaining stability. Exceeding this limit risks control loop instability and reduced headroom for slope compensation-designs must verify DMAX ≥ VOUT/(VOUT−VIN(MAX)) during worst-case input.
MP3221GJ-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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):
- 2.5V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 2.7A (Switch)
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
MP3221GJ-P FAQ
1.How can I place an order for MP3221GJ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3221GJ-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 MP3221GJ-P reliable?
The price and inventory of MP3221GJ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3221GJ-P is usually 5 days.
3.What payment methods are accepted for MP3221GJ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3221GJ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3221GJ-P?
MP3221GJ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3221GJ-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 MP3221GJ-P?
For technical support, including MP3221GJ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3221GJ-P requirements.
6.How does Aetrix verify that MP3221GJ-P is sourced from the original manufacturer or authorized distributors?
All MP3221GJ-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 MP3221GJ-P meets industry standards.
7.What is the process for return or replacement of MP3221GJ-P?
All MP3221GJ-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3221GJ-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 MP3221GJ-P part is unused and in its original packaging.
Return procedure for MP3221GJ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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