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Monolithic Power Systems Inc. MP2233DJ-LF-P
- Part No.:
- MP2233DJ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP2233DJ-LF-P.pdf
- Description:
- IC REG BUCK ADJ 3A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:981
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Product details
Overview
MP2233DJ-LF-P from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated 80mΩ high-side and 30mΩ low-side MOSFETs, delivering up to 3A continuous output current across a 4.5V–16V input range. It operates at a fixed 1.4MHz switching frequency, supports external clock synchronization (300kHz–3MHz), and features programmable soft-start, over-current protection with hiccup mode, and thermal shutdown - deployed in notebook I/O power rails and flat-panel display bias supplies.
For engineers reviewing the MP2233DJ-LF-P datasheet, MP2233DJ-LF-P pinout, MP2233DJ-LF-P application, or MP2233DJ-LF-P equivalent, key selection considerations include its TSOT-23-8 package footprint, internal bootstrap driver architecture, 0.8V feedback reference, 5V VCC LDO output, and cycle-by-cycle current limiting with 4.6A typical trip threshold under 40% duty cycle.
Technical Context
The MP2233DJ-LF-P employs peak-current-mode control with a fixed-frequency oscillator and internal 0.8V reference, enabling fast transient response and simplified loop compensation. Its proprietary switching-loss-reduction technique minimizes conduction and switching losses across load conditions.
It integrates a 5V internal LDO (VCC) powered from VIN, a floating high-side gate driver supplied via BST capacitor, and EN/SYNC dual-function pin supporting both enable logic and external clock synchronization - all operating within -40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - supports wide industrial and computing supply rails including 5V, 12V, and 15V systems without external pre-regulation. |
| Output Current | 3A continuous - sufficient for powering core logic, DDR memory termination, or display interface ICs in compact portable devices. |
| Switching Frequency | Fixed 1.4MHz (±200kHz) - enables use of small 1.0–1.5µH inductors and reduces EMI fundamental below 2MHz for FCC/CE compliance. |
| Feedback Reference | 0.8V ±20mV (–40°C to +85°C) - allows precise output regulation down to 0.8V and scalable to higher voltages using external resistor divider. |
| HS/LS RDS(on) | 80mΩ / 30mΩ - delivers >90% efficiency at 3.3V/3A output from 12V input, minimizing thermal dissipation in space-constrained layouts. |
| Soft-Start Current | 14μA typical - sets controlled ramp rate for output voltage using external SS capacitor; avoids inrush current into large output capacitance banks. |
| Thermal Shutdown | 150°C activation with 20°C hysteresis - protects die during overload or poor PCB thermal design while allowing automatic recovery at ~130°C. |
Pinout & Package
MP2233DJ-LF-P is housed in an 8-pin TSOT-23 package with exposed thermal pad (pin 4 GND), optimized for high-power density and thermal performance on 2-layer PCBs. The package measures 2.9mm × 1.6mm × 0.85mm and supports reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS | Soft-Start Control | Connects to external capacitor; internal 14μA current source charges it to delay output ramp-up and prevent inrush into downstream capacitance. |
| 2 IN | Main Input Supply | Accepts 4.5V–16V; powers internal MOSFETs and regulators; requires local 22μF ceramic decoupling placed adjacent to pin with low-inductance layout. |
| 3 SW | Switch Node | Drives external inductor; experiences full VIN-to-GND swing; must be routed with wide copper and minimal loop area to reduce EMI and voltage spikes. |
| 4 GND | Power & Signal Ground | System reference for FB, SS, EN/SYNC, and VCC; connects directly to thermal pad and main ground plane for low-impedance return path. |
| 5 BST | Bootstrap Supply | Forms floating gate drive for high-side MOSFET via capacitor between BST and SW; requires 0.1μF ceramic capacitor with short trace routing. |
| 6 EN/SYNC | Enable & Clock Sync | Digital enable (1.4V threshold); also accepts 300kHz–3MHz external clock signal to synchronize switching and reduce beat frequencies. |
| 7 VCC | Internal 5V LDO Output | Powers control circuitry; requires 0.1–0.22μF ceramic decoupling to GND; not intended to drive external loads beyond IC internals. |
| 8 FB | Feedback Input | Compares output voltage (via resistor divider) to 0.8V internal reference; high-impedance node requiring short, shielded trace to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, reducing conduction loss and improving full-load efficiency by 5–8% versus asynchronous designs. |
| External clock synchronization | Enables noise-sensitive applications (e.g., audio subsystems, ADC references) to avoid switching frequency interference through deterministic timing alignment. |
| Proprietary switching-loss reduction | Optimizes gate drive timing and dead-time control to suppress shoot-through and ringing, lowering EMI emissions without added filtering. |
| Hiccup-mode over-current protection | Enters periodic restart cycle during sustained short-circuit, limiting average power dissipation to <1W and preventing thermal runaway. |
| Adjustable UVLO via EN pin | Allows system-level input voltage monitoring by configuring external resistor divider on EN, enabling custom start/stop thresholds above 4.5V. |
Applications
| Notebook I/O Power Rail | Digital Set-Top Box SoC Core Supply |
|---|---|
Use Scenario: Powers USB controller, PCIe switch, and SATA PHY circuitry in ultrabook platforms with 12V main rail. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3V/3A with tight line/load regulation and fast transient response to burst data traffic. Use Value: Enables single-chip solution replacing discrete MOSFET + controller, reducing BOM count by 7 parts and PCB area by 35mm². |
Use Scenario: Supplies 1.8V/3A to ARM-based media processor core in cable/satellite STB with thermally constrained metal chassis. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter synchronized to system clock to suppress conducted EMI into video DAC and HDMI PHY. Use Value: Achieves 92% efficiency at 1.8V/3A from 12V input, limiting junction temperature rise to <45°C on 2-layer board without heatsink. |
| Flat-Panel Display Bias Supply | Distributed Power System Intermediate Bus |
Use Scenario: Generates 5V/3A for TFT LCD source driver ICs and timing controller in 24-inch monitor with slim bezel mechanical envelope. IC Role / Device Role / Timing Role: Compact intermediate-stage regulator stepping down 12V system rail to 5V before final LDO stages for analog pixel drivers. Use Value: TSOT-23-8 footprint fits within 4mm vertical clearance; 1.4MHz operation allows 1.5µH inductor height ≤1.2mm. |
Use Scenario: Provides 3.3V/3A intermediate bus for isolated DC/DC modules in industrial PLC backplane with strict EMC Class A limits. IC Role / Device Role / Timing Role: Synchronized buck converter operating at 1.2MHz to avoid overlap with 1.0MHz isolated flyback primary switching frequency. Use Value: Reduces differential-mode EMI peaks by 12dB through frequency coordination, eliminating need for common-mode chokes in front-end filter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2238DJ-LF-Z | Higher 6A output rating, 1.2MHz fixed frequency, same 8-pin TSOT-23 package but different pinout (BST and SW swapped). | Requires PCB redesign due to non-pin-compatible layout; suited for future-proofing where 3A margin is insufficient. | Select when system load may scale beyond 3A and board revision allows layout change; not drop-in replaceable. |
| RT7295BGJ8F | 4.5V–18V input, 3A output, 1.3MHz switching, but uses external MOSFETs and requires more external components (gate resistors, bootstrap diode). | Offers greater flexibility in MOSFET selection for ultra-low EMI or high-temp operation, at cost of increased design complexity. | Prefer when thermal derating above 85°C ambient is required or when discrete FETs with specific RDS(on)/Qg trade-offs are needed. |
Compared with MP2233DJ-LF-P, MP2238DJ-LF-Z provides higher current headroom but mandates layout changes, while RT7295BGJ8F trades integration for thermal and EMI customization - making MP2233DJ-LF-P optimal for cost-sensitive, space-constrained 3A applications requiring minimal external parts.
Availability
MP2233DJ-LF-P is available at Aetrix Electronics and suitable for notebook systems, digital set-top boxes, flat-panel televisions and monitors, and distributed power systems requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP2233DJ-LF-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, and global manufacturing partnerships.
The MP2233 belongs to MPS's high-frequency synchronous buck converter product line, engineered specifically for compact, high-efficiency DC/DC conversion in portable and space-constrained consumer and industrial electronics.
FAQ
What is the minimum recommended output capacitor value for stable operation?
The MP2233DJ-LF-P is optimized for ceramic output capacitors ≥22μF with low ESR. For 3.3V/3A operation, a 22μF X7R 0805 ceramic capacitor achieves <15mV peak-to-peak ripple at 1.4MHz; smaller values risk instability due to insufficient phase margin in the internal compensation network.
Can the MP2233DJ-LF-P operate with a 3.3V input supply?
No - the absolute minimum input voltage is 4.5V per the Recommended Operating Conditions table. At 3.3V, the internal 5V VCC LDO cannot regulate, and the high-side MOSFET lacks sufficient gate drive, causing failure to start or erratic switching behavior.
How does the EN/SYNC pin function during clock synchronization?
When an external clock (300kHz–3MHz) is applied to EN/SYNC, the MP2233DJ-LF-P disables its internal oscillator and aligns its PWM rising edge to the external clock's rising edge. The internal clock remains active only when EN/SYNC is held high with no external signal present.
Is an external bootstrap diode required for reliable operation?
An external bootstrap diode (e.g., 1N4148) is optional and recommended only when duty cycle exceeds 65% (e.g., 5V output from 12V input). It improves BST capacitor charging efficiency and prevents VBST droop during high-duty-cycle operation, enhancing light-load stability.
What is the maximum allowable RMS current for the input capacitor?
The input capacitor must handle ≥1.5A RMS current at 3A load and 12V input. Per the application note, worst-case RMS current occurs at VIN = 2×VOUT and equals half the load current - so for 3A output, select a 22μF X5R/X7R ceramic capacitor rated for ≥1.5A RMS ripple current.
Does the MP2233DJ-LF-P support pre-biased output startup?
Yes - the IC detects pre-biased output voltage at the FB pin during startup and disables both high-side and low-side switches until the SS capacitor voltage exceeds the sensed FB voltage, preventing reverse current flow and ensuring monotonic ramp-up.
What thermal resistance value should be used for junction-to-ambient calculation?
For standard 4-layer PCB layout per JESD51-7, θJA = 100°C/W is specified. With 1.25W max power dissipation at 25°C ambient, this yields a 125°C junction rise - requiring derating above 25°C ambient or enhanced copper pour to maintain safe operation below 125°C TJ.
MP2233DJ-LF-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-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 13V
- Current - Output:
- 3A
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MP2233DJ-LF-P FAQ
1.How can I place an order for MP2233DJ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2233DJ-LF-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 MP2233DJ-LF-P reliable?
The price and inventory of MP2233DJ-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2233DJ-LF-P is usually 5 days.
3.What payment methods are accepted for MP2233DJ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2233DJ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2233DJ-LF-P?
MP2233DJ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2233DJ-LF-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 MP2233DJ-LF-P?
For technical support, including MP2233DJ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2233DJ-LF-P requirements.
6.How does Aetrix verify that MP2233DJ-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2233DJ-LF-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 MP2233DJ-LF-P meets industry standards.
7.What is the process for return or replacement of MP2233DJ-LF-P?
All MP2233DJ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2233DJ-LF-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 MP2233DJ-LF-P part is unused and in its original packaging.
Return procedure for MP2233DJ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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