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Monolithic Power Systems Inc. MP3209DJ-LF-Z
- Part No.:
- MP3209DJ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MP3209DJ-LF-Z.pdf
- Description:
- IC REG BOOST ADJ 350MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,871
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Product details
Overview
MP3209DJ-LF-Z from Monolithic Power Systems is a current-mode 1.4MHz boost converter IC with integrated 0.5Ω MOSFET, supporting 2.5V–6V input and up to 22V output at 350mA peak switch current. It features internal soft-start, UVLO (2.45V rising), thermal shutdown (160°C), and operates in TSOT23-5 package for space-constrained OLED drivers and small LCD displays.
For engineers reviewing the MP3209DJ-LF-Z datasheet, MP3209DJ-LF-Z pinout, MP3209DJ-LF-Z application, or MP3209DJ-LF-Z equivalent, key selection criteria include fixed 1.4MHz switching frequency, 1.25V feedback reference, 85% max duty cycle, and thermal/overcurrent protection-critical for battery-powered portable power rails.
Technical Context
The MP3209DJ-LF-Z implements a fixed-frequency peak-current-mode control architecture with an internal ramp compensation to suppress subharmonic oscillation above 50% duty cycle. Its error amplifier compares FB voltage against a 1.25V bandgap reference and drives PWM comparator via stabilized current-sense signal.
Operation relies on internal MOSFET switching between GND and up to 22V at SW pin, with EN pin enabling/disabling regulation via 1.3V threshold and 100mV hysteresis. Soft-start ramps current limit over 120µs to limit inrush and output overshoot during startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.4MHz fixed - enables use of 22µH inductor and <1mm profile solution |
| Input Voltage Range | 2.5V to 6V - supports single-cell Li-ion (3.0–4.2V) and dual-cell alkaline (3.0–4.5V) |
| Output Voltage Range | 3V to 22V - configurable via external resistor divider; FB = 1.25V ±4% |
| Peak Switch Current | 350mA - limits inductor saturation and ensures stable operation at full load |
| Feedback Reference | 1.25V - sets output accuracy; FB bias current ≤ –30nA minimizes divider error |
| UVLO Threshold | 2.45V rising - prevents erratic startup below minimum battery voltage |
| Thermal Shutdown | 160°C - protects die under sustained overload; auto-recovery after cooldown |
Pinout & Package
MP3209DJ-LF-Z uses the TSOT23-5 surface-mount package (1.6mm × 2.9mm × 1.1mm), optimized for low-profile portable designs. Exposed pad not present; thermal resistance θJA = 220°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Power Switch Drain | Connects to inductor and Schottky rectifier; swings 0V to 22V; handles 350mA peak current |
| 2 (GND) | Analog & Power Ground | Single ground return for FB, EN, and internal circuitry; must tie to low-impedance PCB plane |
| 3 (FB) | Feedback Input | Senses output via resistor divider; 1.25V reference enables precise VOUT setting |
| 4 (EN) | Enable Control | Active-high logic input (1.3V threshold); must not float; connects to VIN for always-on operation |
| 5 (IN) | Input Supply | Accepts 2.5–6V; requires local 4.7µF ceramic bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power MOSFET | 0.5Ω RDS(on) reduces conduction loss and eliminates external high-side switch |
| Internal Compensation | Eliminates external compensation network; simplifies layout and reduces BOM count |
| Soft-Start Function | 120µs current-limit ramp prevents input surge and output overshoot during power-up |
| Protection Suite | UVLO, cycle-by-cycle current limit, and thermal shutdown ensure robust fault recovery |
| Ultra-Thin Solution | TSOT23-5 footprint supports <1mm height with 22µH inductor and 4.7µF ceramic caps |
Applications
| OLED Display Power | Cell Phone Backlight |
|---|---|
Use Scenario: Driving white OLED panels requiring 12–18V bias from 3.7V Li-ion battery. IC Role / Device Role / Timing Role: Boost converter providing regulated high-voltage rail with fast transient response. Use Value: 1.4MHz switching enables compact 22µH inductor and low-ESR ceramic output cap, minimizing board area and EMI. | Use Scenario: Powering LED backlight strings in entry-level smartphones with limited PCB real estate. IC Role / Device Role / Timing Role: Constant-voltage boost stage feeding LED driver IC or direct PWM dimming path. Use Value: Internal soft-start prevents camera flash interference during system boot; UVLO avoids brownout-induced display flicker. |
| External Modem Module | Small LCD Bias Supply |
Use Scenario: Generating 5V or 12V auxiliary rail for USB-to-serial modems in portable IoT gateways. IC Role / Device Role / Timing Role: Standalone DC-DC converter enabling modem operation from single 3.3V system rail. Use Value: 2.5V min input allows operation down to depleted battery; thermal shutdown prevents damage during extended data bursts. | Use Scenario: Providing VPOS/VNEG rails for character LCDs in handheld test equipment. IC Role / Device Role / Timing Role: Dual-rail generator (with inverting charge pump) using MP3209 for positive output only. Use Value: Fixed 1.4MHz frequency simplifies EMI filtering; 85% max duty cycle supports 3.3V→12V conversion without dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS610992DRCR | Lower quiescent current (200nA shutdown), but 0.65A switch current and 1.2MHz fSW | Better for ultra-low-power coin-cell applications; less suitable for 350mA continuous loads | Select when battery life > efficiency; avoid if output ripple at 1.2MHz conflicts with RF sections |
| RT9013-33GJ5 | Fixed 3.3V output, no FB pin; 300mA switch current; 1.5MHz fSW; no UVLO or thermal shutdown | Limited to fixed-output use cases; lacks protection and adjustability | Choose only for cost-sensitive, non-critical 3.3V boost where external feedback and safety are omitted |
Compared with TPS610992DRCR and RT9013-33GJ5, MP3209DJ-LF-Z uniquely balances adjustable output, robust protection, and 350mA capability in a 1.4MHz TSOT23-5 package-making it optimal for mid-power portable displays and modems where reliability and footprint matter.
Availability
MP3209DJ-LF-Z is available at Aetrix Electronics and suitable for cell phones, OLED drivers, and small LCD displays requiring stable component supply across production lifecycles.
Supply support for MP3209DJ-LF-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, headquartered in Kirkland, WA, with global design and support centers.
The MP3209 belongs to MPS's low-power DC-DC converter product line, engineered specifically for space- and efficiency-constrained portable electronics needing compact, protected boost functionality.
FAQ
What is the maximum recommended output current for MP3209DJ-LF-Z?
The MP3209DJ-LF-Z supports up to 350mA peak switch current. Continuous output current depends on input/output voltage ratio, ambient temperature, and PCB thermal design. At 5V input to 12V output, typical continuous output is ~120mA with 2-layer board and no airflow. Derate linearly above 85°C ambient.
Can MP3209DJ-LF-Z operate with input voltage below 2.5V?
No. The absolute minimum operating input voltage is 2.5V per datasheet specifications. Below this, UVLO disables regulation. The UVLO rising threshold is 2.45V ±0.2V, and hysteresis is 92mV-ensuring clean turn-on but no sub-threshold operation.
Is an external Schottky diode required, and what are the key selection criteria?
Yes-an external Schottky diode is mandatory. Select based on reverse voltage rating > VOUT(max), forward voltage < 0.4V at peak load, and fast recovery (<50ns). For 12V output, CMH5H-3 (40V, 0.35V) or BAT54-02 (30V, 0.33V) are validated choices per MPS app note.
How does the internal soft-start function affect startup behavior?
The internal soft-start ramps the current limit from zero to full scale over 120µs in three 40µs steps. This limits inrush current into output capacitance, reducing input voltage sag and output overshoot-critical for systems sharing battery rails with noise-sensitive analog circuits.
What is the purpose of the NC pins in the UTQFN-8 variant, and do they exist in MP3209DJ-LF-Z?
UTQFN-8 has two NC pins (pins 3 and 7) for package compatibility; MP3209DJ-LF-Z uses TSOT23-5 and has no NC pins. All five pins are functional: SW, GND, FB, EN, IN. Leaving EN floating is prohibited-tie to VIN or controller GPIO.
Does MP3209DJ-LF-Z support synchronization to an external clock?
No. MP3209DJ-LF-Z uses a fixed internal oscillator at 1.4MHz and lacks SYNC or CLKIN functionality. Frequency cannot be adjusted or synchronized externally-designs requiring phase alignment must use alternative parts like MP1542 or MP2315.
What PCB layout practices are critical for stable MP3209DJ-LF-Z operation?
Place input capacitor (≥4.7µF ceramic) within 2mm of IN/GND pins; keep SW-GND-FB loop area minimal; route FB trace away from noisy nodes; tie GND pins directly to solid inner-plane; avoid vias under IC body. Thermal relief on GND pad is unnecessary-TSOT23-5 has no exposed thermal pad.
MP3209DJ-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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):
- 22V
- Current - Output:
- 350mA
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MP3209DJ-LF-Z FAQ
1.How can I place an order for MP3209DJ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3209DJ-LF-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 MP3209DJ-LF-Z reliable?
The price and inventory of MP3209DJ-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3209DJ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP3209DJ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3209DJ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3209DJ-LF-Z?
MP3209DJ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3209DJ-LF-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 MP3209DJ-LF-Z?
For technical support, including MP3209DJ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3209DJ-LF-Z requirements.
6.How does Aetrix verify that MP3209DJ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP3209DJ-LF-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 MP3209DJ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP3209DJ-LF-Z?
All MP3209DJ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3209DJ-LF-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 MP3209DJ-LF-Z part is unused and in its original packaging.
Return procedure for MP3209DJ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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