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Monolithic Power Systems Inc. MP2235SGJ-P
- Part No.:
- MP2235SGJ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP2235SGJ-P.pdf
- Description:
- IC REG BUCK ADJ 3A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,713
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Product details
Overview
MP2235SGJ-P from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 120 mΩ high-side and 50 mΩ low-side MOSFETs, delivering up to 3 A continuous output current across a 4.5 V–16 V input range, fixed 800 kHz switching frequency, and adjustable output voltage starting at 0.804 V - used in notebook I/O power rails and flat-panel display bias supplies.
For engineers reviewing the MP2235SGJ-P datasheet, MP2235SGJ-P pinout, MP2235SGJ-P application, or MP2235SGJ-P equivalent, key selection considerations include its TSOT23-8 package thermal performance (θJA = 100°C/W), 150°C thermal shutdown threshold, 800 mV feedback reference tolerance (±20 mV), and external clock synchronization capability (300 kHz–2 MHz).
Technical Context
The MP2235SGJ-P employs current-mode control for fast transient response and stable loop compensation, with three operating modes: Advanced Asynchronous Modulation (AAM) for light-load efficiency, Discontinuous Conduction Mode (DCM), and Continuous Conduction Mode (CCM) above ~1.2 A load. Its internal 5 V LDO powers control circuitry and gate drivers.
It integrates bootstrap charging via an external BST capacitor between SW and BST pins, supports external soft-start via SS pin (11 µA current source), and features cycle-by-cycle over-current protection with hiccup-mode recovery during output short-circuit faults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 16 V - supports wide industrial and computing supply rails including 5 V, 12 V, and 16 V bus systems. |
| Output Current | 3 A continuous - sufficient for powering FPGA I/O banks, DDR memory termination, or display logic rails. |
| Switching Frequency | Fixed 800 kHz ±100 kHz - enables compact magnetics design while avoiding AM radio band interference. |
| Feedback Reference | 0.804 V ±20 mV - sets output voltage accuracy; allows 1.2 V, 1.8 V, 3.3 V, and 5 V outputs using standard resistor dividers. |
| HS/LS RDS(on) | 120 mΩ / 50 mΩ - minimizes conduction loss at full load; enables >90% peak efficiency at 12 VIN/3.3 VOUT. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
| Sync Input Range | 300 kHz to 2 MHz - allows EMI reduction via spread-spectrum clock alignment or multi-rail synchronization. |
Pinout & Package
MP2235SGJ-P is housed in a thermally enhanced 8-pin TSOT23 package (2.9 mm × 1.6 mm × 0.85 mm), optimized for high-power density on space-constrained PCBs with exposed thermal pad (GND-connected) for improved heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SS | Soft-start control | Connects to external capacitor (e.g., 100 nF) to set startup ramp time; prevents inrush current into output capacitors. |
| 2 - IN | Main power input | Accepts 4.5–16 V supply; requires low-ESR ceramic decoupling capacitor placed within 2 mm of pin for stability. |
| 3 - SW | Power switch node | Drives external inductor; swings from GND to VIN; must be routed with wide copper and multiple vias to minimize ringing. |
| 4 - GND | System ground reference | Primary return path for power and signal; connects directly to thermal pad and large ground plane for thermal and noise control. |
| 5 - BST | Bootstrap supply | Forms floating gate drive for high-side MOSFET via external 0.1 µF capacitor between BST and SW; critical for proper HS turn-on. |
| 6 - EN/SYNC | Enable & clock sync | Digital enable (1.4 V threshold); accepts external 300 kHz–2 MHz clock for EMI management or multi-phase coordination. |
| 7 - VCC | Internal LDO output | 5 V regulated supply for control logic; requires 0.1–0.22 µF ceramic capacitor; ≥0.22 µF risks instability. |
| 8 - FB | Output voltage feedback | Monitors resistive divider output; 0.804 V reference enables precise regulation; sensitive to noise-keep traces short and away from SW. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 120 mΩ HS + 50 mΩ LS MOSFETs eliminate external switches and reduce BOM count by 4+ components. |
| Light-Load Efficiency Mode | AAM (Advanced Asynchronous Modulation) reduces switching losses below ~300 mA, maintaining >85% efficiency at 10 mA load. |
| Robust Protection Suite | Includes cycle-by-cycle OCP, hiccup-mode fault recovery, thermal shutdown (150°C), and input UVLO (3.9 V rising threshold). |
| Flexible Output Programming | Adjustable output from 0.804 V using two external resistors; T-type network support improves noise immunity and stability. |
| High-Frequency Operation | 800 kHz fixed frequency enables use of ≤4.7 µH inductors and <22 µF ceramic output capacitors for ultra-compact designs. |
Applications
| Notebook I/O Power | Digital Set-Top Box Core Supply |
|---|---|
|
Use Scenario: Providing clean, regulated 1.8 V or 3.3 V to USB controller, PCIe bridge, or SATA PHY in thin-and-light notebooks. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3 A rail with tight load regulation (<±1%) across temperature and line variations. Use Value: Eliminates need for external MOSFETs and reduces solution size by 35% vs discrete controllers; AAM mode extends battery runtime during idle states. |
Use Scenario: Generating 1.2 V core voltage for SoC in digital cable receivers with strict ripple (<20 mVpp) and transient response requirements. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter operating in CCM at full load and DCM during channel-change bursts. Use Value: 800 kHz switching enables fast transient recovery (<10 µs to settle ±2% after 2 A step); integrated OCP prevents damage during firmware update glitches. |
| Flat-Panel Monitor Logic Rail | Distributed Power System Intermediate Bus |
|
Use Scenario: Powering timing controller (TCON) and LVDS transmitter in 24-inch LCD monitors requiring low-noise 5 V and 12 V rails. IC Role / Device Role / Timing Role: Secondary buck stage converting 12 V intermediate bus to 5 V logic supply with minimal EMI impact on video signals. Use Value: SYNC pin allows synchronization to system master clock, eliminating beat frequencies that cause visible screen artifacts. |
Use Scenario: Point-of-load conversion in industrial PLC backplanes where 24 V intermediate bus is stepped down to 3.3 V for microcontroller peripherals. IC Role / Device Role / Timing Role: Compact, thermally robust buck regulator supporting extended temperature operation (−40°C to +125°C junction). Use Value: TSOT23-8 package with exposed thermal pad achieves 3 A output with <25°C case rise at 24 VIN/3.3 VOUT on 2-layer board. |
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 |
|---|---|---|---|
| MP2235SGJ-Z | Same die and electrical specs; differs only in tape-and-reel packaging (no functional difference). | Identical use cases; selected when automated SMT placement requires reel format. | Choose MP2235SGJ-Z for volume production; MP2235SGJ-P is same device in cut-tape or sample packaging. |
| RT7295BGJ8F | Higher 5 A rating, 600 kHz default frequency, different pinout (EN on Pin 3), no AAM mode. | Better suited for higher-current applications but lacks light-load optimization and sync flexibility. | Select RT7295BGJ8F only if >3 A output or lower-frequency EMI profile is required; not drop-in compatible due to pin mismatch. |
Compared with MP2235SGJ-P, MP2235SGJ-Z offers identical performance in reel format, while RT7295BGJ8F trades light-load efficiency and clock synchronization for higher current and lower base frequency - making it unsuitable for battery-powered or noise-sensitive applications where MP2235SGJ-P excels.
Availability
MP2235SGJ-P is available at Aetrix Electronics and suitable for notebook I/O power, digital set-top box core supplies, and flat-panel monitor logic rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2235SGJ-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 20 years of leadership in DC/DC conversion, motor drivers, and LED lighting controllers.
The MP2235S product line delivers compact, high-efficiency synchronous buck converters for space-constrained computing and consumer electronics, emphasizing integration, thermal resilience, and ease of layout.
FAQ
What is the maximum recommended output capacitance for MP2235SGJ-P?
The MP2235SGJ-P supports ceramic, tantalum, or low-ESR electrolytic output capacitors. For stability, total output capacitance should be ≥22 µF with ESR ≤30 mΩ. Ceramic capacitors dominate impedance at 800 kHz; using ≥47 µF X7R ceramics with 0.5 mm trace length to FB ensures phase margin >45° across all loads.
Can MP2235SGJ-P operate with a 3.3 V input supply?
No - MP2235SGJ-P has a minimum input voltage of 4.5 V per absolute maximum ratings and operating conditions. Attempting operation below 4.5 V will trigger under-voltage lockout (UVLO), disabling the regulator. For 3.3 V input applications, consider MPS's MP2158 or MP2161 series.
Is an external bootstrap diode required for reliable operation?
An external bootstrap diode (e.g., IN4148) from VCC to BST is optional but recommended when VOUT ≥ 3.3 V and duty cycle >65% (e.g., 12 VIN/5 VOUT). It prevents BST voltage droop during light-load PFM operation, reducing output ripple by up to 40% in those conditions.
How does the soft-start time scale with capacitor value on the SS pin?
Soft-start time (tSS) is calculated as tSS(ms) = (0.804 V × CSS(nF)) / 11 µA. A 100 nF capacitor yields ~7.3 ms ramp; 470 nF yields ~34 ms. Longer times reduce inrush but increase startup delay - select based on downstream load sequencing requirements.
What is the purpose of the T-type feedback network shown in the datasheet?
The T-type network (R1–R2–Rt) improves regulation accuracy and noise immunity by isolating the FB pin from parasitic capacitance on the output rail. Rt adds a zero to the feedback loop, compensating for output capacitor ESR effects and enabling stable operation with low-ESR ceramics or polymer capacitors.
Does MP2235SGJ-P support forced PWM mode?
No - MP2235SGJ-P operates exclusively in automatic mode: AAM at light loads, DCM at medium loads, and CCM at full load. It lacks a MODE pin or external control to force continuous PWM; this design prioritizes efficiency over fixed-frequency predictability at partial load.
What is the minimum inductor value recommended for 12 VIN/3.3 VOUT operation?
Using Equation (3) with ΔIL = 30% of 3 A = 0.9 A, the calculated minimum inductance is 2.2 µH. MPS recommends 3.3 µH (e.g., LQH3NPN3R3MJ0L) for optimal efficiency, transient response, and margin against saturation at peak current (IL(pk) ≈ 3.45 A).
MP2235SGJ-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):
- 14.4V
- Current - Output:
- 3A
- Frequency - Switching:
- 800kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MP2235SGJ-P FAQ
1.How can I place an order for MP2235SGJ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2235SGJ-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 MP2235SGJ-P reliable?
The price and inventory of MP2235SGJ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2235SGJ-P is usually 5 days.
3.What payment methods are accepted for MP2235SGJ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2235SGJ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2235SGJ-P?
MP2235SGJ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2235SGJ-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 MP2235SGJ-P?
For technical support, including MP2235SGJ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2235SGJ-P requirements.
6.How does Aetrix verify that MP2235SGJ-P is sourced from the original manufacturer or authorized distributors?
All MP2235SGJ-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 MP2235SGJ-P meets industry standards.
7.What is the process for return or replacement of MP2235SGJ-P?
All MP2235SGJ-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2235SGJ-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 MP2235SGJ-P part is unused and in its original packaging.
Return procedure for MP2235SGJ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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