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Monolithic Power Systems Inc. MP3418GJ-P
- Part No.:
- MP3418GJ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP3418GJ-P.pdf
- Description:
- IC REG BOOST ADJ 300MA TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:499
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Product details
Overview
MP3418GJ-P from Monolithic Power Systems is a synchronous step-up DC-DC converter with true output disconnect, designed for ultra-low-voltage battery-powered systems. It starts up from 0.8V input, delivers up to 400mA output current at 1.2MHz fixed switching frequency, and regulates output voltage from 1.8V to 4.0V using an external resistive divider on the FB pin - deployed in portable medical devices requiring stable 3.3V rail from single-cell Li-ion or alkaline sources.
For engineers reviewing the MP3418GJ-P datasheet, MP3418GJ-P pinout, MP3418GJ-P application, or MP3418GJ-P equivalent, key selection criteria include startup voltage (0.8V), shutdown current (<0.1µA), true output disconnect capability, VIN>VOUT down-mode operation, and TSOT23-8 thermal performance (θJA = 100°C/W).
Technical Context
The MP3418GJ-P implements fixed-frequency (1.2MHz) current-mode PWM control with internal slope compensation and an integrated error amplifier referenced to 1.21V. Its dual-MOSFET synchronous rectifier includes an N-channel switch (RDS(ON) = 110mΩ) and P-channel disconnect switch (RDS(ON) = 120mΩ), enabling true output isolation during shutdown.
Startup behavior includes linear charge mode (200mA inrush limit), free-running mode (<1.7V), then closed-loop boost or down-mode operation depending on VIN/VOUT relationship. Power-save mode activates under light load, reducing quiescent current to 38µA while maintaining regulation via pulse-frequency modulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.6V to 4.0V - supports single-cell alkaline, NiMH, or deeply discharged Li-ion batteries. |
| Output Voltage Range | 1.8V to 4.0V - set externally via FB divider; enables flexible rail generation for MCU, sensor, or RF modules. |
| Switching Frequency | 1.2MHz (±20%) - permits use of compact 4.7–10µH inductors and low-ESR ceramic capacitors. |
| Max Output Current | 400mA - peak switch current limit independent of input/output voltage, verified across operating range. |
| Shutdown Current | 0.1µA typical - achieved by halting all internal circuitry and blocking PMOS body diode conduction. |
| Feedback Reference | 1.21V ±2% - internal precision reference used with external resistor divider to set output voltage. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects die during overload or poor PCB thermal design without latch-off. |
Pinout & Package
MP3418GJ-P is housed in a thermally enhanced 8-pin TSOT23 package (2.9mm × 1.6mm × 0.85mm), optimized for high-power-density portable designs with exposed thermal pad connected to PGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input supply connection | Bypassed with ≥4.7µF ceramic capacitor; supplies power to internal bias and gate drivers. |
| 2 OUT | Regulated output node | Source terminal of internal PMOS; connects directly to output capacitor; must be routed with minimal loop area. |
| 3 SW | Switch node | Drain of NMOS and inductor connection point; high dv/dt node requiring tight layout to minimize EMI. |
| 4 PGND | Power ground return | Primary return path for high-current switching loops; tied to thermal pad and external ground plane. |
| 5 NC | No connection | Internally unconnected; must remain floating - no external tie or pull-up/down. |
| 6 AGND | Analog ground reference | Reference for FB, EA, and soft-start circuitry; routed separately from PGND to avoid noise coupling. |
| 7 FB | Feedback input | Connects to voltage divider tap; senses output and compares to 1.21V reference to regulate VOUT. |
| 8 EN | Enable control input | Active-high logic input (VEN > 0.7V enables); draws <2µA; supports direct microcontroller GPIO control. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | PMOS isolates OUT from IN during shutdown, allowing full discharge of output capacitance and <0.1µA input current. |
| Inrush current limiting | 200mA startup current limit during linear charge phase prevents battery voltage sag and system brownout. |
| VIN > VOUT down-mode operation | Continues regulation when input exceeds output (e.g., USB charging while powering load), eliminating need for external OR-ing. |
| Integrated synchronous rectifier | NMOS + PMOS pair replaces Schottky diode, improving efficiency by ~8% at 100mA and eliminating reverse leakage. |
| Internal soft-start and compensation | Eliminates external SS capacitor and loop compensation components, reducing BOM count and layout sensitivity. |
Applications
| Wireless Headset Power Management | Portable Glucose Monitor |
|---|---|
|
Use Scenario: Powers Bluetooth audio SoC and OLED display from single 1.5V alkaline cell. IC Role / Device Role / Timing Role: Step-up regulator providing regulated 3.3V rail with zero-load shutdown current <0.1µA to extend shelf life. Use Value: Enables >12-month battery life in standby due to sub-µA shutdown and inrush-limited startup. |
Use Scenario: Supplies 2.8V to electrochemical sensor and 3.3V to microcontroller in handheld diagnostic device. IC Role / Device Role / Timing Role: Dual-rail generator with independent feedback paths supporting analog front-end and digital core. Use Value: Maintains accuracy under varying battery voltage (0.8–1.6V) via true current-mode control and 1.21V reference. |
| USB-C Peripheral Hub | Smart Hearing Aid Transceiver |
|
Use Scenario: Generates 5V from 3.3V USB PD sink rail to power legacy USB 2.0 peripherals. IC Role / Device Role / Timing Role: Boost converter operating in VIN>VOUT down-mode when upstream source exceeds output setting. Use Value: Eliminates need for external ideal diode or power-path controller during mixed-source operation. |
Use Scenario: Powers 2.4GHz BLE radio and MEMS microphone from zinc-air hearing aid battery (0.9–1.3V). IC Role / Device Role / Timing Role: Ultra-low-VIN start-up converter with short-circuit protection during ear canal moisture exposure. Use Value: Survives repeated output shorts without latch-off or thermal shutdown, ensuring continuous operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61291DRVR | 0.7V start-up, 1.5MHz, 300mA max, no true output disconnect (body-diode leakage ~1µA) | Lacks output isolation; unsuitable where full VOUT discharge is required (e.g., safety-critical medical reset) | Select if lower start-up voltage is critical and µA-level shutdown current is acceptable. |
| MAX17222ETA+ | 0.4V start-up, 1.2MHz, 500mA, integrated LDO post-regulator, no down-mode operation | Includes LDO but cannot regulate when VIN > VOUT; higher quiescent current (800nA vs. 38µA) | Select if post-LDO ripple suppression is needed and VIN>VOUT operation is not required. |
Compared with TPS61291DRVR and MAX17222ETA+, MP3418GJ-P uniquely combines true output disconnect, 0.8V start-up, and VIN>VOUT down-mode in a single TSOT23-8 package - critical for battery longevity and fault-safe discharge in Class II medical and wearable applications.
Availability
MP3418GJ-P is available at Aetrix Electronics and suitable for battery-powered products, personal medical devices, and wireless peripherals requiring stable component supply with guaranteed long-term sourcing and RoHS-compliant packaging.
Supply support for MP3418GJ-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 over two decades of leadership in DC-DC conversion and motor driver technologies.
The MP3418 belongs to MPS's ultra-low-voltage boost converter product line, engineered specifically for energy-constrained portable and medical electronics where startup reliability below 1V and zero-load power loss are primary design constraints.
FAQ
What is the minimum input voltage required to initiate startup?
The MP3418GJ-P guarantees startup from 0.8V input (VST) under all conditions, verified across temperature and process corners. This allows reliable operation from nearly depleted single-cell batteries, including alkaline, NiMH, and Li-ion cells down to end-of-life voltage.
Does MP3418GJ-P support output voltages higher than 4.0V?
No - the absolute maximum rated output voltage is 4.0V, and the internal feedback reference (1.21V) and error amplifier are specified only for 1.8V–4.0V output range. Exceeding 4.0V risks damage to the FB pin and violates ABSOLUTE MAXIMUM RATINGS for SW and OUT pins (6.5V).
How does the device behave when input voltage exceeds output voltage?
MP3418GJ-P enters down-mode operation: the NMOS switch turns off, and the PMOS gate is driven to connect VIN directly to VOUT through its channel. Regulation continues, but efficiency drops sharply due to PMOS RDS(ON) conduction loss - output current must be limited to maintain safe junction temperature.
Can the NC pin (Pin 5) be grounded or left floating?
Pin 5 is internally unconnected and must remain floating - grounding it may cause unpredictable behavior or increased leakage. The datasheet explicitly states "No Connection" and provides no functional specification or tolerance for biasing this pin.
Is external compensation required for stability?
No - the MP3418GJ-P features fully internal compensation optimized for standard 4.7–10µH inductors and 10µF ceramic output capacitors. Adding external compensation components will destabilize the control loop and is neither recommended nor supported.
What protection features are integrated?
MP3418GJ-P integrates over-voltage protection (OVP), short-circuit protection with automatic recovery, thermal shutdown (150°C), inrush current limiting (200mA), and undervoltage lockout (0.5V). All protections operate without external components and do not require latch-off or manual reset.
Does the device support synchronization to an external clock?
No - MP3418GJ-P uses a fixed 1.2MHz internal oscillator with no SYNC pin or frequency adjustment capability. Synchronization is not supported; attempting to inject external signals onto SW or other pins may damage the IC or disrupt regulation.
MP3418GJ-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- 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):
- 0.6V
- Voltage - Input (Max):
- 4V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 4V
- Current - Output:
- 300mA (Switch)
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MP3418GJ-P FAQ
1.How can I place an order for MP3418GJ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3418GJ-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 MP3418GJ-P reliable?
The price and inventory of MP3418GJ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3418GJ-P is usually 5 days.
3.What payment methods are accepted for MP3418GJ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3418GJ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3418GJ-P?
MP3418GJ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3418GJ-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 MP3418GJ-P?
For technical support, including MP3418GJ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3418GJ-P requirements.
6.How does Aetrix verify that MP3418GJ-P is sourced from the original manufacturer or authorized distributors?
All MP3418GJ-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 MP3418GJ-P meets industry standards.
7.What is the process for return or replacement of MP3418GJ-P?
All MP3418GJ-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3418GJ-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 MP3418GJ-P part is unused and in its original packaging.
Return procedure for MP3418GJ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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