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Monolithic Power Systems Inc. MP3437GJ-Z
- Part No.:
- MP3437GJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP3437GJ-Z.pdf
- Description:
- IC REG BOOST ADJ TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,762
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Product details
Overview
MP3437GJ-Z from Monolithic Power Systems is a fully integrated, synchronous boost converter IC designed for high-efficiency step-up power conversion in space-constrained portable systems. It delivers up to 9.5A switch current, supports 2.7V–16V input and 0.8V–16V output, operates at 600kHz fixed frequency with COT control, and integrates 14mΩ/21mΩ MOSFETs - enabling 20W output from a single-cell Li-ion battery in notebooks and AI speakers.
For engineers reviewing the MP3437GJ-Z datasheet, MP3437GJ-Z pinout, MP3437GJ-Z application, or MP3437GJ-Z equivalent, this device requires attention to MODE pin absence (TSOT23-8), automatic pass-through behavior above VOUT_SET, light-load mode selection constraints, and thermal derating in TSOT23-8 due to θJA = 52°C/W.
Technical Context
The MP3437GJ-Z implements adaptive constant-off-time (COT) control with cycle-by-cycle current limiting on the low-side MOSFET, enabling fast transient response without external compensation. Its internal soft-start, programmable UVLO via EN pin, and 150°C thermal shutdown provide robust system-level protection.
As a TSOT23-8 variant, it lacks the MODE pin and defaults exclusively to pulse-skip mode (PSM) under light load - eliminating ultrasonic or forced continuous conduction modes. The integrated high-side MOSFET replaces external Schottky diodes, while bootstrap (BST) and feedback (FB) pins enable precise output regulation down to ±0.5% reference voltage accuracy over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 16V start-up; 0.8V to 16V operation - supports single-cell Li-ion (2.7V min) and wide-input industrial rails. |
| Output Voltage Range | 0.8V to 16V - programmable via FB resistor divider; enables VPP rail generation for SSDs and 8V/2.5A speaker amplifiers. |
| Switch Current Limit | 9.5A typical - sets maximum inductor peak current; defines 20W capability at 3.3VIN → 8VOUT. |
| Efficiency | >90% at 3.3VIN → 8V/2.5A - achieved via integrated 14mΩ LS-FET and 21mΩ HS-FET with no external diode loss. |
| Switching Frequency | 600kHz fixed - enables compact 1.5µH inductor sizing; supports MPL-AL6050 series for optimized EMI and thermal performance. |
| Reference Voltage | 1.00V ±1% (–40°C to +125°C) - determines output accuracy; FB pin draws only 50nA, minimizing divider error. |
| Thermal Protection | 150°C shutdown with 25°C hysteresis - prevents permanent damage; TSOT23-8 package has θJA = 52°C/W on 2-layer PCB. |
Pinout & Package
MP3437GJ-Z uses the TSOT23-8 package (2.9mm × 1.6mm × 1.1mm), optimized for ultra-compact portable designs. Unlike the QFN-10 variant, it omits the MODE pin and operates exclusively in pulse-skip mode (PSM).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BST) | Bootstrap supply | Connects 0.1µF ceramic capacitor to SW; powers HS-FET gate driver during high-side conduction. |
| 2 (VOUT) | Regulated output | Drain of internal HS-FET; supplies VDD when VIN < 3.4V and VOUT > VIN; powers external loads up to 16V. |
| 3 (SW) | Power switch node | Connects to inductor; junction of LS-FET drain and HS-FET source; carries full switching current and ripple. |
| 4 (GND) | Power ground | Primary return path for LS-FET, HS-FET, and internal bias circuits; must be low-impedance and thermally coupled. |
| 5 (FB) | Feedback input | Senses output via resistor divider; 1.00V reference sets VOUT = 1.00V × (1 + R1/R2); 50nA input current minimizes divider error. |
| 6 (VDD) | Internal bias supply | Powered by VIN (>3.4V) or VOUT (if VIN < 3.4V); requires 4.7µF local ceramic decoupling; regulates internal circuitry. |
| 7 (EN) | Enable control | Logic-level input (1.23V threshold); programs VIN UVLO; must be pulled high or low - never left floating. |
| 8 (VIN) | Input supply | Accepts 2.7V–16V; bypassed locally with ceramic capacitor; supplies energy during boost and pass-through modes. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual MOSFETs | 14mΩ LS-FET + 21mΩ HS-FET eliminates external Schottky diode, reduces BOM count, and improves efficiency at 2.5A–9.5A loads. |
| Automatic pass-through mode | Engages when VIN > VOUT_SET in PSM; HS-FET remains on, enabling near-zero dropout operation without switching loss or ripple. |
| Adaptive COT control | Delivers sub-10µs load transient response without external compensation components; maintains stability across input/output variations. |
| Programmable UVLO via EN | EN pin sets VIN under-voltage lockout threshold (e.g., 1.23V EN rise = ~2.7V VIN start-up); avoids brown-out during battery discharge. |
| 150°C thermal shutdown | Protects die under overload or poor PCB thermal design; 25°C hysteresis ensures safe restart after cooling in TSOT23-8's limited thermal mass. |
Applications
| Notebooks | AI Speakers |
|---|---|
|
Use Scenario: Boosting 3.3V system rail to 8V for audio amplifier and display backlight in ultra-thin clamshell designs. IC Role / Device Role: Primary synchronous boost regulator delivering 2.5A continuous output with automatic pass-through when USB-C PD input exceeds 8V. Use Value: Eliminates discrete diode and external FET, reducing solution size by 35% versus legacy controllers while maintaining >90% efficiency at full load. |
Use Scenario: Powering 5W Class-D amplifier and voice processing SoC from single-cell Li-ion in always-on smart speakers. IC Role / Device Role: High-current boost converter operating in PSM to minimize quiescent current (<500μA) during standby, extending battery life. Use Value: Achieves 20-hour playback on 2000mAh battery via 9.5A switch current headroom and 1.00V reference accuracy for stable amplifier bias. |
| Portable POS Systems | SSD VPP Rails |
|
Use Scenario: Generating 12V from 3.6V Li-ion for thermal printer head and EMV contactless reader in handheld payment terminals. IC Role / Device Role: Compact, high-efficiency boost stage with integrated MOSFETs and 150°C thermal protection for intermittent high-pulse loads. Use Value: Delivers 12V/1.2A with <100mV load regulation across 0–1.2A, enabling reliable flash programming and NFC field generation. |
Use Scenario: Providing 12V VPP programming voltage for NAND flash in embedded SSD modules with strict space constraints. IC Role / Device Role: Precision boost regulator with 0.5% FB reference tolerance and OVP clamping at 16.5V to prevent NAND overvoltage damage. Use Value: Ensures ±1% VPP accuracy over –40°C to +85°C, meeting JEDEC specification for 12V±0.12V programming compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT4801GJ6F (Richtek) | TSOT23-6, 5A switch limit, 500kHz, no BST pin - requires external bootstrap diode/capacitor. | Limited to ≤10W output; unsuitable for 20W SSD VPP or 2.5A speaker loads. | Select only if board space is tighter than 2.9mm × 1.6mm and power demand is ≤10W. |
| TPS61088RHLR (TI) | QFN-16, 10A switch limit, 500kHz–2MHz adjustable, MODE pin present, larger footprint (3mm × 3mm). | Supports FCCM/USM modes and higher thermal margin (θJA = 35°C/W), but incompatible with TSOT23-8 layout. | Choose when multi-mode light-load optimization or >9.5A peak current is required - not a drop-in replacement. |
Compared with RT4801GJ6F, MP3437GJ-Z delivers 90% more switch current in the same footprint and eliminates external bootstrap components; versus TPS61088RHLR, it trades mode flexibility and thermal headroom for 40% smaller area and lower BOM cost in PSM-only applications.
Availability
MP3437GJ-Z is available at Aetrix Electronics and suitable for notebooks, AI speakers, portable POS systems, and SSD VPP rails requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for MP3437GJ-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 power management ICs, with over 20 years of expertise in DC/DC converters, motor drivers, and LED drivers.
The MP3437 product line targets high-density portable power applications, integrating dual MOSFETs and advanced control topologies to replace discrete boost solutions in space- and efficiency-critical designs.
FAQ
What is the minimum input voltage required for startup?
The MP3437GJ-Z starts up at 2.7V with no external VDD bias. If an external 3V bias is applied to VDD, startup occurs at 0.95V VIN. This dual-start capability supports deep battery discharge scenarios in portable devices while ensuring reliable biasing under all conditions.
Does MP3437GJ-Z support forced continuous conduction mode (FCCM)?
No. The TSOT23-8 package lacks the MODE pin; MP3437GJ-Z operates exclusively in pulse-skip mode (PSM). FCCM and ultrasonic mode (USM) are only available on the QFN-10 variant (MP3437GRP-Z). Designers requiring FCCM must select the QFN package.
How does automatic pass-through mode function?
When VIN exceeds the programmed VOUT_SET in PSM, the LS-FET stays off and HS-FET remains on, allowing direct conduction from VIN to VOUT through the inductor and HS-FET body diode. This reduces losses to <50mV dropout and eliminates switching noise during high-input conditions.
What is the recommended inductor for MP3437GJ-Z?
MPS recommends the MPL-AL6050-1R5 (1.5µH, 12A saturation current, 12mΩ DCR). Its shielded construction minimizes EMI, and its saturation rating aligns with the 9.5A switch limit. Alternative inductors must sustain ≥12A peak current and maintain DCR <15mΩ to preserve efficiency above 2A.
Can MP3437GJ-Z be used with a 24V input?
No. Absolute maximum VIN is 18V (transient) and 16V continuous. Applying 24V exceeds rating and risks permanent damage. For 24V input, consider MPS's MP9486A (40V-rated) or TI's TPS61178 (30V-rated) with appropriate derating.
Is the FB reference voltage affected by temperature?
Yes - VREF is specified as 0.985V to 1.015V over –40°C to +125°C (±1.5% total variation). This 30mV drift impacts output accuracy; for ±1% VOUT tolerance, use 0.1% resistor dividers and account for temperature coefficient in high-precision applications.
What thermal derating applies to TSOT23-8 at 85°C ambient?
With θJA = 52°C/W and TJ(MAX) = 150°C, max allowable power dissipation at TA = 85°C is (150 − 85)/52 ≈ 1.25W. At 9.5A switch current and 16V output, this limits practical continuous output to ~1.5A @ 8V or ~0.8A @ 12V without forced airflow or copper pour.
MP3437GJ-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- 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):
- 0.8V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 16V
- Current - Output:
- -
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MP3437GJ-Z FAQ
1.How can I place an order for MP3437GJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3437GJ-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 MP3437GJ-Z reliable?
The price and inventory of MP3437GJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3437GJ-Z is usually 5 days.
3.What payment methods are accepted for MP3437GJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3437GJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3437GJ-Z?
MP3437GJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3437GJ-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 MP3437GJ-Z?
For technical support, including MP3437GJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3437GJ-Z requirements.
6.How does Aetrix verify that MP3437GJ-Z is sourced from the original manufacturer or authorized distributors?
All MP3437GJ-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 MP3437GJ-Z meets industry standards.
7.What is the process for return or replacement of MP3437GJ-Z?
All MP3437GJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3437GJ-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 MP3437GJ-Z part is unused and in its original packaging.
Return procedure for MP3437GJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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