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Monolithic Power Systems Inc. MP1471GJ-Z
- Part No.:
- MP1471GJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MP1471GJ-Z.pdf
- Description:
- IC REG BUCK ADJ 3A TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:8,114
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Product details
Overview
MP1471GJ-Z from Monolithic Power Systems is a synchronous step-down DC-DC converter with integrated 150mΩ high-side and 70mΩ low-side MOSFETs, delivering up to 3A peak output current across a 4.7V–16V input range, fixed 500kHz switching frequency, and adjustable 0.8V–0.9×VIN output voltage - used in compact power rails for digital set-top boxes and flat-panel displays.
For engineers reviewing the MP1471GJ-Z datasheet, MP1471GJ-Z pinout, MP1471GJ-Z application, or MP1471GJ-Z equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and current-limit specifications, and real-world application constraints including AAM light-load mode behavior and BST capacitor requirements.
Technical Context
The MP1471GJ-Z operates in fixed-frequency (400–580kHz), peak-current-mode control with internal 0.8V reference and error amplifier driving COMP voltage to regulate output via external resistor divider on FB. Its proprietary AAM (Advanced Asynchronous Modulation) enables PFM operation below ~340mA load to maintain efficiency at light loads.
It integrates bootstrap charging circuitry requiring a 1µF BST capacitor between SW and BST pins, supports hiccup-mode over-current protection triggered by FB <140mV, and features internal soft-start with 1ms ramp time. UVLO thresholds are 3.85V (falling) and 4.2V (rising), with thermal shutdown at 150°C and 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.7V to 16V - supports wide industrial and consumer input rails including 5V, 12V, and 15V systems without external pre-regulation. |
| Output Voltage Range | 0.8V to 0.9×VIN - enables precise regulation down to sub-1V core supplies using external R1/R2 feedback network. |
| Switching Frequency | 400–580kHz (typ. 500kHz) - balances EMI control, inductor size, and efficiency; fixed-frequency simplifies EMI filter design. |
| Peak Output Current | 3.5–4.2A (typ. 4.2A) - provides headroom above 3A nominal load for transient surges in digital video and gaming applications. |
| Internal MOSFET RDS(on) | 150mΩ (HS) / 70mΩ (LS) - minimizes conduction loss and enables >90% efficiency at 2A–3A loads with proper layout and component selection. |
| Feedback Reference | 776–824mV (typ. 800mV) - tight tolerance ensures accurate output voltage setting; enables ±1% regulation with standard 1% resistors. |
| Soft-Start Time | 1ms - prevents inrush current and output overshoot during power-up; internally controlled, no external capacitor required. |
Pinout & Package
MP1471GJ-Z is housed in a space-saving 6-pin TSOT-23 package (JEDEC MO-193 AB), with exposed pad for thermal enhancement. Pin 1 is bottom-left when viewing top marking left-to-right; GND pin requires robust copper pour and multiple vias for thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | System ground reference | Primary return path for power and feedback circuits; must connect directly to PCB ground plane with low-inductance traces and ≥3 thermal vias. |
| 2 SW | Switch node | High dv/dt node connecting internal HS/LS MOSFETs; requires short, wide trace to minimize ringing and EMI; connects to inductor and BST capacitor. |
| 3 IN | Main input supply | Accepts 4.7–16V; requires local 22µF ceramic decoupling capacitor placed within 3mm of pin; high-current path demanding low-ESR input cap. |
| 4 FB | Feedback input | Senses output voltage via external resistor divider; high-impedance node sensitive to noise - route away from SW and use guard ring if needed. |
| 5 EN | Enable control | Digital ON/OFF control; 1.4–1.6V rising threshold; internal 1MΩ pull-down allows floating-disable; clamped to 6.5V Zener for overvoltage protection. |
| 6 BST | Bootstrap supply | Provides floating gate drive for high-side MOSFET; requires 1µF ceramic capacitor between BST and SW; external diode optional for >65% duty cycle. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 150mΩ HS + 70mΩ LS MOSFETs eliminate external switch selection, reduce BOM count, and ensure matched timing and thermal coupling. |
| AAM Light-Load Mode | Enables PFM operation below ~340mA (at 12VIN/3.3VOUT), maintaining >85% efficiency at 10mA while avoiding audible switching noise. |
| Internal Soft-Start | 1ms monotonic ramp prevents output overshoot and inrush into large output capacitors - critical for FPGA and SoC power sequencing. |
| Hiccup Over-Current Protection | Enters periodic restart mode when FB drops below 140mV (e.g., output short), limiting average fault current to <100mA and preventing thermal runaway. |
| Robust Thermal Management | Thermal shutdown at 150°C with 20°C hysteresis and θJA = 100°C/W (TSOT-23-6) - enables reliable 2.5A continuous operation with minimal PCB copper area. |
Applications
| Game Consoles | Digital Set-Top Boxes |
|---|---|
Use Scenario: Powering GPU memory and I/O interfaces in portable and home console platforms with dynamic load profiles. IC Role / Device Role / Timing Role: Primary 3.3V/2.5V/1.8V buck regulator delivering up to 3A peak current with fast transient response to burst-mode graphics workloads. Use Value: Integrated MOSFETs and AAM mode enable compact, low-noise power delivery meeting strict thermal and EMI limits in sealed enclosures. |
Use Scenario: Generating stable 3.3V and 1.2V rails for demodulator SoCs, HDMI transceivers, and USB PHYs in cable/satellite receivers. IC Role / Device Role / Timing Role: Secondary buck converter supplying regulated core and I/O voltages downstream of main 12V rail, synchronized to system power-on sequence via EN pin. Use Value: 4.7–16V input range accepts unregulated 12V wall adapters; internal soft-start prevents brownout during cold boot of multi-rail SoC subsystems. |
| Flat-Panel Television | General-Purpose Embedded Systems |
Use Scenario: Supplying 5V and 3.3V to TCON (timing controller), LVDS transmitter, and backlight driver ICs in LCD/LED TV main boards. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator operating from 12V intermediate bus, supporting variable backlight dimming-induced load transients. Use Value: Fixed 500kHz switching enables predictable EMI filtering; hiccup OCP protects against sustained short-circuits in high-density display power trees. |
Use Scenario: Providing flexible, low-cost DC-DC conversion in industrial HMIs, smart sensors, and gateway controllers where board space and BOM simplicity are critical. IC Role / Device Role / Timing Role: General-purpose synchronous buck converter configured for 1.8V–5V outputs using standard 1% resistors and off-the-shelf 6.5µH inductors. Use Value: Minimal external components (only inductor, input/output caps, two feedback resistors) reduce design cycle time and qualification effort for Class B EMC compliance. |
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 |
|---|---|---|---|
| MP1477GQ-Z | Successor device with improved 4.5–16V input range, 4A peak current, lower RDS(on) (120mΩ/55mΩ), and enhanced thermal performance (θJA = 85°C/W). | Supports higher continuous loads (>2.5A) and wider VIN range; recommended for new designs targeting longer product lifecycle and higher reliability margins. | Select MP1477GQ-Z for new designs requiring extended input range, higher current headroom, or improved thermal derating - MP1471GJ-Z remains valid for legacy replacements. |
| RT7272BGJ8F | Richtek part with 4.5–18V input, 3A rating, 500kHz fSW, but uses external MOSFETs and lacks integrated BST driver or AAM mode. | Requires external high-side gate driver and bootstrap circuit; no built-in light-load optimization - increases BOM count and layout complexity. | Choose RT7272BGJ8F only if dual-MOSFET flexibility or 18V max input is mandatory; MP1471GJ-Z offers superior integration and ease-of-use for space-constrained designs. |
Compared with MP1477GQ-Z, MP1471GJ-Z has narrower input range and lower current capability but retains identical pinout and footprint for drop-in replacement in existing layouts; versus RT7272BGJ8F, it eliminates external gate drive components and delivers better light-load efficiency through AAM, reducing total solution size by ~30%.
Availability
MP1471GJ-Z is available at Aetrix Electronics and suitable for game consoles, digital set-top boxes, and flat-panel television power supplies requiring stable component supply, long-term obsolescence management, and RoHS-compliant packaging.
Supply support for MP1471GJ-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 analog and power semiconductor company headquartered in Kirkland, Washington, specializing in high-performance DC-DC converters, LED drivers, and motor drivers for consumer, industrial, and automotive markets.
The MP1471 belongs to MPS's high-frequency synchronous buck converter product line, designed specifically for compact, high-efficiency point-of-load regulation in space-constrained consumer electronics with stringent thermal and EMI requirements.
FAQ
What is the maximum recommended output current for continuous operation?
The MP1471GJ-Z supports up to 3A peak output current, but continuous operation at 3A requires careful thermal design: minimum 1-inch² 2-oz copper pour with ≥6 thermal vias under the exposed pad, ambient temperature ≤55°C, and airflow ≥200LFM. Derate to 2.5A for still-air conditions per θJA = 100°C/W and TJ(max) = 125°C.
Can the MP1471GJ-Z operate with an input voltage below 4.7V?
No - the absolute minimum operating input voltage is 4.7V per datasheet specifications. Below this, the internal regulator cannot sustain VCC, causing erratic operation or shutdown. The UVLO falling threshold is 3.85V, but functional operation is not guaranteed below 4.7V, and startup will not occur.
Is an external bootstrap diode required for reliable operation?
An external bootstrap diode is optional and only beneficial when duty cycle exceeds 65% (e.g., VOUT ≥ 5V with VIN = 12V). It improves BST capacitor charging efficiency and reduces losses. For 3.3V output at 12V input (D ≈ 28%), the internal bootstrap circuit is sufficient; use 1µF X7R ceramic BST capacitor regardless.
How does the AAM mode affect output voltage accuracy at light loads?
In AAM (PFM) mode, output voltage regulation remains within ±2% of nominal due to the same 0.8V feedback reference and error amplifier architecture. However, output ripple increases slightly (to ~20mVpp) compared to PWM mode (~10mVpp) because switching becomes discontinuous - acceptable for non-sensitive digital loads.
What is the purpose of the 140mV threshold on the FB pin?
The 140mV threshold triggers hiccup-mode over-current protection during output short-circuit events. When FB falls below this level, the controller disables switching and enters timed restart cycles (≈100ms period), limiting average power dissipation to prevent thermal damage while allowing automatic recovery once the fault clears.
Does the MP1471GJ-Z support forced PWM mode?
No - the MP1471GJ-Z does not include a forced PWM pin or register control. It operates exclusively in automatic transition between PWM (heavy load) and AAM/PFM (light load) based on COMP voltage vs. internal 0.5V AAM threshold. Forced PWM requires alternative parts like MP2315 or MPQ4420A.
What is the minimum recommended inductor value for 3.3V/3A operation?
For 12VIN → 3.3VOUT/3A, the recommended inductor is 6.5µH (per typical application circuit), with saturation current ≥4.2A and DCR <15mΩ. Values below 4.7µH increase peak current stress and reduce efficiency; values above 10µH degrade transient response without significant light-load benefit.
MP1471GJ-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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):
- 4.7V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 14.4V
- Current - Output:
- 3A
- Frequency - Switching:
- 490kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
MP1471GJ-Z FAQ
1.How can I place an order for MP1471GJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1471GJ-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 MP1471GJ-Z reliable?
The price and inventory of MP1471GJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP1471GJ-Z is usually 5 days.
3.What payment methods are accepted for MP1471GJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1471GJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1471GJ-Z?
MP1471GJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1471GJ-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 MP1471GJ-Z?
For technical support, including MP1471GJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1471GJ-Z requirements.
6.How does Aetrix verify that MP1471GJ-Z is sourced from the original manufacturer or authorized distributors?
All MP1471GJ-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 MP1471GJ-Z meets industry standards.
7.What is the process for return or replacement of MP1471GJ-Z?
All MP1471GJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1471GJ-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 MP1471GJ-Z part is unused and in its original packaging.
Return procedure for MP1471GJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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