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Monolithic Power Systems Inc. MP2234GJ-Z
- Part No.:
- MP2234GJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP2234GJ-Z.pdf
- Description:
- IC REG BUCK ADJ 2A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,302
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Product details
Overview
MP2234GJ-Z from Monolithic Power Systems is a synchronous step-down DC-DC converter IC delivering 2A continuous output current with fixed 800kHz switching frequency, 4.5V–16V input range, and adjustable 0.8V–VIN×90% output voltage. It integrates 100mΩ/40mΩ high-side/low-side MOSFETs and operates in peak-current-mode control for fast transient response in notebook I/O power and flat-panel display supplies.
For engineers reviewing the MP2234GJ-Z datasheet, MP2234GJ-Z pinout, MP2234GJ-Z application, or MP2234GJ-Z equivalent, key selection criteria include its TSOT-23-8 package thermal resistance (θJA = 100°C/W), external soft-start programmability, 300kHz–2MHz clock synchronization capability, and hiccup-mode over-current protection for short-circuit robustness.
Technical Context
The MP2234GJ-Z employs peak-current-mode control with an internal 0.807V reference and integrated compensation network, enabling stable regulation without external loop components for typical loads. Its error amplifier drives a COMP node that directly controls MOSFET on-time via cycle-by-cycle current sensing with 0.22Ω internal sense resistance.
It features dual-mode operation: fixed-frequency PWM above ~0.9A load and Advanced Asynchronous Modulation (AAM) PFM at light loads, with automatic transition triggered by VCOMP crossing 0.6V. Bootstrap charging uses an external capacitor between SW and BST pins, regulated to 5V with UVLO (2.2V rising threshold) on the floating driver.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - supports 5V, 12V, and 15V intermediate bus rails without external regulators. |
| Output Current | 2A continuous - sustains full load across -40°C to +125°C junction temperature range. |
| Switching Frequency | Fixed 800kHz (±13%) - enables compact magnetics; synchronizable from 300kHz to 2MHz for EMI reduction. |
| Feedback Reference | 0.807V ±1.5% - sets output voltage accuracy; allows 0.8V minimum VOUT with external resistor divider. |
| HS/LS RDS(ON) | 100mΩ / 40mΩ - minimizes conduction loss at 2A, supporting >90% efficiency at mid-load with 12V→3.3V conversion. |
| Thermal Shutdown | 150°C activation with 20°C hysteresis - protects die during sustained overload; auto-recovery at ~130°C. |
| Soft-Start Current | 11μA - charges external SS capacitor linearly to control output voltage ramp rate and limit inrush. |
Pinout & Package
MP2234GJ-Z is housed in an 8-pin TSOT-23 package with exposed thermal pad (pin 4 GND connected to pad). The package supports 1.25W continuous power dissipation at TA=25°C and requires careful PCB layout: wide traces for IN/SW/BST, low-inductance decoupling at IN/VCC, and minimal FB trace length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS | Soft-Start Control | Connects to external capacitor; 11μA internal current source ramps voltage to delay output rise and limit inrush current. |
| 2 IN | Main Input Supply | Accepts 4.5V–16V; powers internal LDO and MOSFET drivers; requires local low-ESR ceramic decoupling. |
| 3 SW | Switch Node | Drives external inductor; swings from VIN to ~−0.3V; high di/dt node requiring short, wide routing and ground vias. |
| 4 GND | Power & Signal Ground | Reference for all voltages; connects to thermal pad; must tie to solid ground plane with multiple vias. |
| 5 BST | Bootstrap Supply | Forms floating gate drive for HS MOSFET via external capacitor to SW; clamped to 5V with 2.2V UVLO. |
| 6 EN/SYNC | Enable & Clock Input | Digital enable (1.4V typ threshold); accepts external 300kHz–2MHz clock for synchronization or noise shaping. |
| 7 VCC | Internal 5V LDO Output | Powers control circuitry; requires 0.1–0.22μF ceramic cap to GND; not intended for external loading. |
| 8 FB | Feedback Input | Senses output via resistor divider; compares to 0.807V reference; sensitive analog node requiring shortest possible trace. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 100mΩ HS / 40mΩ LS MOSFETs eliminate external diode loss, enabling >92% efficiency at 1A with 12V→3.3V. |
| External clock synchronization | EN/SYNC pin accepts 300kHz–2MHz external clock to align switching edges, reducing system-level EMI peaks. |
| Power-save mode (AAM) | Transitions to PFM below ~0.9A load, reducing quiescent current to 0.8mA and maintaining >85% efficiency at 10mA. |
| Hiccup-mode OCP | Enters periodic restart on output short-circuit, limiting average fault current to <100mA and preventing thermal runaway. |
| Adjustable soft-start | SS pin allows precise control of output ramp time (e.g., 10nF → ~0.7ms) to prevent overshoot and inrush stress on downstream capacitors. |
Applications
| Notebook I/O Power | Digital Set-Top Box Core Logic |
|---|---|
Use Scenario: Providing clean 1.8V/3.3V rails for USB controllers, PCIe switches, and SATA PHYs in ultrabook platforms. IC Role / Device Role / Timing Role: Primary buck regulator supplying core logic with tight load regulation (<±1%) and fast transient response (<5µs to settle). Use Value: Integrated MOSFETs and peak-current control ensure stable 2A delivery under dynamic CPU I/O load steps without external compensation. | Use Scenario: Generating 1.2V core voltage for ARM-based SoCs and 3.3V for HDMI interface circuitry in cable/satellite receivers. IC Role / Device Role / Timing Role: Main PMIC buck stage with EN/SYNC pin synchronized to system clock to suppress conducted EMI in audio/video signal paths. Use Value: 800kHz fixed frequency and AAM mode maintain efficiency across standby (10mA) and active (1.5A) states while meeting FCC Class B limits. |
| Flat-Panel Monitor Logic Supply | Distributed Power System Intermediate Bus |
Use Scenario: Delivering 5V/1.2V to timing controllers (TCON), LVDS transmitters, and backlight drivers in 24-inch LCD panels. IC Role / Device Role / Timing Role: Secondary buck converter fed from 12V intermediate rail; provides isolated, low-noise logic supply with soft-start sequencing. Use Value: External soft-start (SS pin) coordinates power-up with panel initialization firmware, preventing latch-up during cold start. | Use Scenario: Point-of-load conversion from 12V backplane to 3.3V for FPGA I/O banks and communication peripherals in industrial gateways. IC Role / Device Role / Timing Role: Compact, thermally efficient buck stage operating continuously at 1.8A with ambient up to 70°C. Use Value: TSOT-23-8 package with θJA=100°C/W enables high-density layout; hiccup OCP prevents field failures during connector hot-plug events. |
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 |
|---|---|---|---|
| MP2332GJ-Z | Successor device with improved efficiency (94% @ 2A), lower IQ (25μA shutdown), and extended input range (4.2V–18V). | Recommended for new designs; supports higher VIN and lower light-load power consumption. | Select MP2332GJ-Z when designing for production beyond Q3 2024 or requiring RoHS-compliant green packaging. |
| RT7295BGJ8F | 4.5V–18V input, 2A, 600kHz fixed frequency, 110mΩ/55mΩ MOSFETs, no external sync capability. | Lacks clock synchronization and has slower transient response due to voltage-mode control. | Choose RT7295BGJ8F only if cost sensitivity outweighs EMI control needs and existing layout cannot accommodate MP2234's BST routing. |
Compared with MP2234GJ-Z, MP2332GJ-Z offers higher efficiency and broader input range but requires updated layout for BST capacitor placement, while RT7295BGJ8F trades synchronization and control-loop speed for lower BOM cost in non-EMI-critical applications.
Availability
MP2234GJ-Z is available at Aetrix Electronics and suitable for notebook systems, digital set-top boxes, flat-panel monitors, and distributed power systems requiring stable component supply with full lifecycle support.
Supply support for MP2234GJ-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.
The MP2234 belongs to MPS's high-frequency synchronous buck converter product line, engineered for space-constrained consumer and computing applications where efficiency, thermal performance, and EMI control are critical.
FAQ
What is the maximum recommended output current for MP2234GJ-Z under continuous operation?
The MP2234GJ-Z delivers 2A continuous output current across its full operating temperature range (-40°C to +125°C junction), verified per datasheet Section 6 Absolute Maximum Ratings and Electrical Characteristics. Derating is required above TA=70°C per thermal resistance θJA=100°C/W; at 85°C ambient, max continuous load drops to ~1.6A with standard 4-layer PCB layout.
Can MP2234GJ-Z be synchronized to an external clock, and what is the valid frequency range?
Yes, the EN/SYNC pin accepts an external clock signal from 300kHz to 2MHz for synchronization. The external clock must have a pulse width less than 1.2μs and be applied ≥2ms after startup. Synchronization aligns the internal oscillator's rising edge with the external clock's rising edge, enabling deterministic EMI reduction in multi-rail systems.
Does MP2234GJ-Z require an external bootstrap diode, and when is it beneficial?
An external bootstrap diode (e.g., IN4148) from VCC to BST is optional but recommended when VOUT is 3.3V or 5V and duty cycle exceeds 65% (i.e., VIN > 5.1V for 3.3V output). It improves high-duty-cycle efficiency by reducing BST capacitor discharge through the internal charge pump, particularly in 12V→3.3V applications.
How is output voltage adjusted, and what is the feedback reference voltage?
Output voltage is set using an external resistor divider from VOUT to GND, connected to the FB pin. The internal reference is 0.807V ±1.5% at 25°C. For example, to set 3.3V output: R1 = 40.2kΩ, R2 = 13kΩ (per Table 1). Layout best practice requires placing R1/R2 as close as possible to FB with no vias on the FB trace to avoid noise coupling.
What protection features does MP2234GJ-Z include, and how do they behave during fault conditions?
MP2234GJ-Z includes cycle-by-cycle over-current protection (3–4A limit), hiccup-mode recovery on sustained overload, thermal shutdown at 150°C (with 20°C hysteresis), and input UVLO (3.9V rising threshold). During output short-circuit, it enters hiccup mode-shutting down for ~10ms, then attempting restart-limiting average fault current to <100mA and preventing thermal damage.
Is MP2234GJ-Z suitable for new designs, and what is the recommended replacement?
No-MP2234GJ-Z is marked "NOT RECOMMENDED FOR NEW DESIGNS" in the official datasheet (Rev. 1.0, 2013), with MP2332GJ-Z designated as the direct successor. MP2332GJ-Z offers improved efficiency, lower quiescent current, extended input range (4.2V–18V), and enhanced thermal performance, making it the preferred choice for all new schematics.
What is the purpose of the T-type resistor (R5) in the feedback network, and how is its value selected?
The T-type resistor (R5) between the FB node and the lower feedback resistor (R2) shapes the control loop for optimal phase margin and transient response. Its value is calculated based on desired crossover frequency (typically ≤80kHz, or 1/10 of 800kHz), internal compensation (RZ = 300kΩ), and inductor value. Table 1 provides pre-validated R5 values for common output voltages and inductors (e.g., 5.6kΩ for 3.3V/4.7μH).
MP2234GJ-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:
- Not For New Designs
- 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:
- 2A
- 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
MP2234GJ-Z FAQ
1.How can I place an order for MP2234GJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2234GJ-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 MP2234GJ-Z reliable?
The price and inventory of MP2234GJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2234GJ-Z is usually 5 days.
3.What payment methods are accepted for MP2234GJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2234GJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2234GJ-Z?
MP2234GJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2234GJ-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 MP2234GJ-Z?
For technical support, including MP2234GJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2234GJ-Z requirements.
6.How does Aetrix verify that MP2234GJ-Z is sourced from the original manufacturer or authorized distributors?
All MP2234GJ-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 MP2234GJ-Z meets industry standards.
7.What is the process for return or replacement of MP2234GJ-Z?
All MP2234GJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2234GJ-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 MP2234GJ-Z part is unused and in its original packaging.
Return procedure for MP2234GJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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