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Monolithic Power Systems Inc. MP2235SGJ-Z
- Part No.:
- MP2235SGJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP2235SGJ-Z.pdf
- Description:
- IC REG BUCK ADJ 3A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:8,541
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Product details
Overview
MP2235SGJ-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter IC delivering 3 A continuous output current with fixed 800 kHz switching frequency, 4.5–16 V input range, and adjustable 0.804 V reference voltage. It integrates 120 mΩ high-side and 50 mΩ low-side MOSFETs in an 8-pin TSOT23 package, targeting compact power rails in notebook I/O and flat-panel display systems.
For engineers reviewing the MP2235SGJ-Z datasheet, MP2235SGJ-Z pinout, MP2235SGJ-Z application, or MP2235SGJ-Z equivalent, key selection considerations include its synchronous operation for >90% efficiency at 3 A, external clock synchronization (300 kHz–2 MHz), thermal shutdown (150°C), hiccup-mode OCP, and soft-start programmability via SS pin.
Technical Context
The MP2235SGJ-Z employs current-mode control with three operating modes-Advanced Asynchronous Modulation (AAM) at light load, Discontinuous Conduction Mode (DCM), and Continuous Conduction Mode (CCM)-to optimize efficiency across 0–3 A output. Its internal 5 V LDO powers control circuitry and supports bootstrap capacitor charging via SW-BST diode path.
It features integrated over-current protection with cycle-by-cycle limiting and hiccup recovery, under-voltage lockout (3.5–4.3 V rising threshold), and feedback regulation referenced to a trimmed 0.804 V ±20 mV band. The EN/SYNC pin serves dual function: enable control and external clock synchronization with 1 μs max pulse width tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 16 V - Supports wide industrial and consumer input rails including 5 V, 12 V, and 16 V bus systems. |
| Output Current | 3 A continuous - Delivers full rated current with ≤15°C case temperature rise on 2-layer PCB at VIN=12 V. |
| Switching Frequency | Fixed 800 kHz ±100 kHz - Enables compact magnetics; synchronizable from 300 kHz to 2 MHz for EMI reduction. |
| Feedback Reference | 0.804 V ±20 mV - Sets precise output voltage via resistor divider; enables 1.0 V to 5.0 V outputs with <±1% error. |
| HS/LS RDS(on) | 120 mΩ / 50 mΩ - Minimizes conduction loss; achieves >92% peak efficiency at 3.3 V/2 A, VIN=12 V. |
| Thermal Shutdown | 150°C with 20°C hysteresis - Protects die during overload; resumes operation at ~130°C without latch-up. |
| OCP Threshold | 4.5 A typical - Triggers hiccup mode on sustained short-circuit; limits average fault current to <100 mA. |
Pinout & Package
MP2235SGJ-Z is housed in an 8-pin TSOT23 package (2.9 mm × 1.6 mm × 0.85 mm), optimized for high-density PCB layouts with exposed thermal pad (GND-connected) for enhanced thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SS | Soft-Start Control | Connects to external capacitor (e.g., 10 nF → 0.74 ms soft-start); charges at 11 µA to ramp FB reference. |
| 2 - IN | Main Input Supply | Accepts 4.5–16 V; requires low-ESR ceramic capacitor placed within 2 mm of pin for stable high-frequency operation. |
| 3 - SW | Power Switch Node | Drives external inductor; swings from GND to VIN; demands short, wide copper traces and multiple vias to GND. |
| 4 - GND | System Ground Reference | Primary return path for power and signal; must connect directly to large ground plane with ≥4 thermal vias. |
| 5 - BST | Bootstrap Supply | Forms floating gate drive for HS-FET via external 0.1 µF capacitor between BST and SW; optional IN4148 diode improves light-load BST voltage. |
| 6 - EN/SYNC | Enable & Clock Input | Logic-high (>1.4 V) enables regulator; accepts external clock (300 kHz–2 MHz) for EMI spread-spectrum alignment. |
| 7 - VCC | Internal LDO Output | 5 V ±0.4 V regulated supply for control logic; decoupled with 0.1–0.22 µF ceramic cap; no larger caps permitted. |
| 8 - FB | Feedback Input | Senses output voltage via resistor divider; high-impedance (10–50 nA) node requiring shortest possible trace to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Three-Mode Efficiency Optimization | AAM (light load), DCM (mid load), CCM (full load) automatically transitions to maintain >85% efficiency from 10 mA to 3 A. |
| Programmable Soft-Start | External SS capacitor sets monotonic output ramp time (e.g., 100 nF = 7.4 ms), preventing inrush current and system reset. |
| Hiccup-Mode Over-Current Protection | Enters periodic restart (≈1 Hz) during sustained short-circuit, limiting average power dissipation and die temperature rise. |
| Adjustable UVLO via EN Resistors | External RUP/RDOWN network raises effective input UVLO threshold above default 3.9 V for battery-powered systems. |
| Integrated Bootstrap Charging | Internal charge pump maintains BST voltage ≥2.2 V; includes UVLO and 150 mV hysteresis to prevent HS-FET misfire. |
Applications
| Portable Notebook I/O Power | Digital Set-Top Box Core Rails |
|---|---|
Use Scenario: Powering USB controller, PCIe switch, and audio codec in ultra-thin notebooks with strict thermal envelope. IC Role / Device Role / Timing Role: Primary 3.3 V/3 A buck regulator supplying low-noise, tightly regulated power to mixed-signal peripherals. Use Value: 800 kHz fixed frequency avoids audible noise; TSOT23 footprint saves >30% board area vs. SO-8 alternatives; AAM mode extends battery runtime at idle. | Use Scenario: Generating 1.2 V core voltage for ARM-based SoC and 5 V for HDMI interface in cable/satellite STBs. IC Role / Device Role / Timing Role: Dual-output capable via external feedback networks; supports dynamic voltage scaling for CPU cores. Use Value: 0.804 V reference enables accurate 1.2 V output with ±1% tolerance; hiccup OCP prevents thermal runaway during HDMI hot-plug events. |
| Flat-Panel Monitor Logic Supply | Distributed Telecom Power |
Use Scenario: Providing 5 V/2 A and 3.3 V/1.5 A rails for timing controller (TCON), backlight driver MCU, and LVDS transmitter. IC Role / Device Role / Timing Role: High-efficiency synchronous buck delivering stable output under fast load transients from display frame updates. Use Value: Current-mode control ensures <5 µs transient response to 1 A step load; 16 V max input accommodates 12 V nominal with surge margin. | Use Scenario: Point-of-load conversion in remote radio units (RRUs) where space, efficiency, and thermal reliability are critical. IC Role / Device Role / Timing Role: Secondary buck stage stepping down 24 V intermediate bus to 5 V for FPGA configuration and monitoring circuits. Use Value: Thermal shutdown + hiccup recovery ensures field reliability under dust-clogged heatsinks; SYNC pin allows synchronization to baseband clock to suppress beat frequencies. |
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 |
|---|---|---|---|
| MP2234SGJ-Z | 2 A output, same 800 kHz freq and 4.5–16 V input; lower RDS(on) (100 mΩ/40 mΩ); smaller 6-pin TSOT23 package. | Limited to ≤2 A loads; lacks EN/SYNC dual-function pin; no external clock sync capability. | Select when board space is constrained and full 3 A is not required; verify thermal margin at 2 A with layout. |
| TPS54331DR | 3 A, 28 V max input, 570 kHz fixed freq; external compensation; no integrated BST diode path; different pinout (SOIC-8). | Requires external bootstrap diode and compensation network; higher BOM count; wider input range suits 24 V industrial use. | Choose for designs needing >16 V input or custom loop tuning; avoid if TSOT23 footprint and minimal external parts are mandatory. |
Compared with MP2234SGJ-Z, the MP2235SGJ-Z delivers 50% higher output current in identical package size and adds clock synchronization-critical for EMI-sensitive displays. Versus TPS54331DR, it reduces component count by integrating BST charging and soft-start while trading off input voltage headroom for compactness and ease of use.
Availability
MP2235SGJ-Z 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, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2235SGJ-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, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP2235SGJ-Z belongs to MPS's MP22xx family of high-frequency synchronous buck converters, engineered for space-constrained consumer and computing applications demanding high efficiency, low quiescent current, and robust protection at 3 A output level.
FAQ
What is the minimum recommended input capacitance for MP2235SGJ-Z?
A 22 µF X5R/X7R ceramic capacitor is recommended, placed within 2 mm of the IN and GND pins. For 12 V input, RMS current rating should exceed 1.5 A. Add a 0.1 µF ceramic capacitor in parallel if using bulk tantalum or electrolytic types to suppress high-frequency ripple.
Can MP2235SGJ-Z operate with an output voltage below 0.804 V?
No. The internal reference is fixed at 0.804 V, and the feedback amplifier is designed for resistive divider configurations that scale output upward. Attempting sub-0.804 V operation violates regulation architecture and results in uncontrolled output collapse.
Is an external bootstrap diode required for reliable operation?
Not required under typical conditions, but recommended when VOUT ≥ 3.3 V and duty cycle >65% (e.g., 12 V → 5 V). An IN4148 diode from VCC to BST prevents BST undervoltage during light-load PFM, reducing output ripple and improving stability.
How does the EN/SYNC pin behave when left floating?
An internal 1 MΩ pull-down resistor ensures the device remains disabled when EN/SYNC is unconnected. No external pull-down is needed. Driving EN >1.4 V (with ≤6 V amplitude) enables regulation; exceeding 6.5 V risks Zener clamp damage unless current-limited via ≥55 kΩ resistor.
What is the maximum allowable inductor DCR for 3 A operation?
For optimal efficiency and thermal performance, inductor DCR should be ≤15 mΩ. At 3 A DC, this limits I²R loss to ≤135 mW-well within the 1.25 W thermal limit of the TSOT23-8 package at 25°C ambient.
Does MP2235SGJ-Z support forced PWM mode?
No. It operates exclusively in automatic mode transitioning between AAM, DCM, and CCM based on load. There is no pin or register to force continuous PWM; light-load efficiency is prioritized via pulse-skipping in AAM mode.
What is the recommended FB trace layout practice?
FB trace must be shortest possible (<3 mm), routed away from SW, BST, and inductor; avoid vias and adjacent noisy signals. Use a T-type RC network (R5 in datasheet Figure 7) close to FB pin to filter high-frequency noise and improve PSRR at switching frequency.
MP2235SGJ-Z 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-Z FAQ
1.How can I place an order for MP2235SGJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2235SGJ-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 MP2235SGJ-Z reliable?
The price and inventory of MP2235SGJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2235SGJ-Z is usually 5 days.
3.What payment methods are accepted for MP2235SGJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2235SGJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2235SGJ-Z?
MP2235SGJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2235SGJ-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 MP2235SGJ-Z?
For technical support, including MP2235SGJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2235SGJ-Z requirements.
6.How does Aetrix verify that MP2235SGJ-Z is sourced from the original manufacturer or authorized distributors?
All MP2235SGJ-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 MP2235SGJ-Z meets industry standards.
7.What is the process for return or replacement of MP2235SGJ-Z?
All MP2235SGJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2235SGJ-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 MP2235SGJ-Z part is unused and in its original packaging.
Return procedure for MP2235SGJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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