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Monolithic Power Systems Inc. MP1471AGJ-Z
- Part No.:
- MP1471AGJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MP1471AGJ-Z.pdf
- Description:
- IC REG BUCK ADJ 3A TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,696
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Product details
Overview
MP1471AGJ-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 110mΩ high-side and 57mΩ low-side MOSFETs, delivering up to 3A output current across a 4.5V–16V input range, fixed 500kHz switching frequency, and adjustable 0.8V–VIN×DMAX output voltage - deployed in compact 6-pin TSOT23 packages for space-constrained power rails in digital consumer electronics.
For engineers reviewing the MP1471AGJ-Z datasheet, MP1471AGJ-Z pinout, MP1471AGJ-Z application, or MP1471AGJ-Z equivalent, this device supports fast transient response via current-mode control, includes AAM light-load efficiency mode, thermal shutdown, hiccup-mode over-current protection, and internal soft-start - critical for reliable 3.3V/3A and 5V/3A point-of-load regulation.
Technical Context
The MP1471AGJ-Z implements fixed-frequency peak-current-mode control with an internal 500kHz oscillator and proprietary switching-loss-reduction technology. Its error amplifier compares FB against a precise 0.804V reference and drives COMP to regulate duty cycle via cycle-by-cycle current sensing on the high-side MOSFET.
It integrates a bootstrap regulator for high-side gate drive, supports AAM (Advanced Asynchronous Modulation) for PFM operation below ~650mA load, and features UVLO with 4.15V rising threshold and 340mV hysteresis - enabling robust startup and brownout recovery in 12V-input systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - supports direct connection to 5V, 12V, and 15V system rails without pre-regulation. |
| Output Current | Up to 3A continuous - sufficient for powering SoCs, FPGAs, and DDR memory subsystems in set-top boxes and monitors. |
| Switching Frequency | Fixed 500kHz ±90kHz - enables use of small 4.7µH inductors and reduces EMI filtering burden vs. lower-frequency converters. |
| Feedback Reference | 0.804V ±12mV - sets output accuracy; allows precise 3.3V (±1%) with 13kΩ/40.2kΩ resistor divider per typical application. |
| Internal MOSFET RDS(ON) | HS: 110mΩ, LS: 57mΩ - minimizes conduction loss at full load, supporting >90% efficiency at 12V→3.3V/3A. |
| Soft-Start Time | 1.5ms - prevents output overshoot and inrush current during power-up in sensitive digital loads. |
| Thermal Shutdown | 150°C activation with 20°C hysteresis - protects die under sustained overload or poor PCB thermal design. |
Pinout & Package
MP1471AGJ-Z is housed in a 6-pin TSOT23-6 package (3.0mm × 1.7mm × 0.9mm), with exposed pad for thermal enhancement. Pin 1 is bottom-left when viewing top marking "AGM" left-to-right.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power and signal ground reference | Mandatory low-impedance connection to system ground plane; serves as return path for SW, FB, and EN currents. |
| 2 SW | Switch node | Drives external inductor; carries high di/dt pulsed current - requires wide copper trace and minimal loop area to reduce EMI. |
| 3 IN | Main input supply | Accepts 4.5V–16V; must be decoupled with ≥22µF ceramic capacitor placed adjacent to pin. |
| 4 FB | Output voltage feedback | Connects to resistor divider tap; senses regulated output; internal comparator triggers foldback if voltage drops below 140mV. |
| 5 EN | Enable control | Logic-high (>1.5V) enables regulation; internal 1MΩ pull-down allows floating-disable; clamped to 6.5V Zener. |
| 6 BST | Bootstrap supply | Connects to 1µF capacitor between SW and BST; supplies floating gate drive for high-side MOSFET. |
Key Features
| Feature | Design Value |
|---|---|
| AAM Light-Load Mode | Enables PFM operation below ~650mA, maintaining >85% efficiency at 10mA load - extends battery life in standby states. |
| Integrated Power MOSFETs | Eliminates need for external high-side/low-side switches and gate drivers - reduces BOM count and layout complexity. |
| Hiccup-Mode OCP | Enters periodic restart on output short-circuit, limiting average fault current to <500mA - prevents thermal runaway and PCB damage. |
| Internal Soft-Start | 1.5ms ramp time ensures monotonic VOUT rise without overshoot - avoids false resets in downstream logic and memory. |
| UVLO with Hysteresis | 4.15V turn-on / 3.8V turn-off thresholds prevent oscillation near dropout - ensures clean startup and shutdown in noisy 12V rails. |
Applications
| Game Console Power Rail | Digital Set-Top Box Core Supply |
|---|---|
|
Use Scenario: Regulating 3.3V/3A for ARM-based application processors and video decoders in portable gaming hardware. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing dynamic load transients during GPU burst activity. Use Value: AAM mode sustains >87% efficiency at 20mA idle current, extending playtime; 500kHz switching enables compact 4.7µH inductor placement. |
Use Scenario: Delivering stable 5V/3A to MPEG-2/4 decoding SoCs and HDMI interface circuitry in cable/satellite receivers. IC Role / Device Role / Timing Role: Main DC/DC converter with tight line/load regulation (<±1.5%) across 4.5V–16V input variation. Use Value: Internal 0.804V reference and current-mode control achieve <50mV output deviation during 0–3A load steps - preventing decoder lockup. |
| Flat-Panel Monitor Logic Supply | Industrial Display Controller Board |
|
Use Scenario: Generating 1.2V/3A for LCD timing controllers and embedded microcontrollers in 24-inch commercial displays. IC Role / Device Role / Timing Role: Secondary buck stage following AC/DC front-end; operates from 12V intermediate rail. Use Value: TSOT23-6 footprint saves board space in narrow bezel designs; thermal shutdown protects against ambient temperature drift in enclosed enclosures. |
Use Scenario: Providing 2.5V/3A to FPGA I/O banks and ADC reference circuits in ruggedized human-machine interface panels. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator with hiccup-mode OCP and -40°C to +125°C junction rating. Use Value: 110mΩ/57mΩ MOSFETs maintain <1.2W dissipation at full load on 4-layer PCB - meets industrial thermal derating requirements. |
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 | Pin-compatible upgrade with improved 0.792V FB reference, 600kHz fSW, and enhanced thermal performance (θJA = 85°C/W). | Supports tighter output tolerance (±0.5%) and higher efficiency at 1A–3A loads; recommended for new designs requiring longer product lifecycle. | Select MP1477GQ for new designs where long-term availability and margin improvement are priorities; MP1471AGJ-Z remains viable for legacy repair or cost-sensitive volume builds. |
| TPS563201 | TI part with 4.5V–17V input, 3A output, but uses external compensation and lacks AAM mode - relies on forced PWM for light-load stability. | Requires additional RC network for loop tuning; no built-in hiccup OCP - needs external current-sense or supervisor IC for fault handling. | Choose TPS563201 only if TI ecosystem alignment or specific ESD robustness (±4kV HBM) is required; adds design overhead versus MP1471AGJ-Z's integrated solution. |
Compared with MP1471AGJ-Z, MP1477GQ offers higher precision and longevity while retaining identical pinout and layout; TPS563201 trades integration for flexibility but increases bill-of-materials and validation effort - making MP1471AGJ-Z optimal for rapid, compact, self-contained 3A buck implementations.
Availability
MP1471AGJ-Z is available at Aetrix Electronics and suitable for game consoles, digital set-top boxes, flat-panel monitors, and industrial display controllers requiring stable component supply, consistent parametric performance, and long-term sourcing continuity.
Supply support for MP1471AGJ-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 core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The MP1471A belongs to MPS's high-efficiency synchronous buck converter product line, designed specifically for space-constrained, medium-current (1A–5A) point-of-load applications in consumer and industrial electronics where integration, thermal performance, and light-load efficiency are critical.
FAQ
What is the minimum recommended input capacitance for MP1471AGJ-Z?
The datasheet specifies a minimum 22µF ceramic input capacitor (X5R/X7R) placed close to the IN and GND pins. This value ensures adequate RMS current handling (≥1.5A) and limits input ripple to <150mV at 3A load. Using smaller capacitance risks excessive voltage droop during high di/dt switching events and may trigger UVLO.
Can MP1471AGJ-Z operate with an output voltage lower than 0.8V?
No - the internal reference is fixed at 0.804V, and the FB pin is designed to regulate only at or above this threshold. Attempting sub-0.8V outputs violates the error amplifier's operating range and results in unregulated behavior. For lower voltages, a different converter with adjustable reference or external reference injection is required.
Is an external bootstrap diode necessary for MP1471AGJ-Z?
An external bootstrap diode (e.g., IN4148) is optional and only beneficial when VOUT ≥ 3.3V and duty cycle exceeds 65% (i.e., VIN > 5V). It improves high-side gate drive efficiency by reducing BST capacitor charging losses - typically increasing full-load efficiency by 0.5–1.2% in 12V→3.3V/3A configurations.
How does the hiccup-mode over-current protection behave during a sustained short circuit?
When FB falls below 140mV due to output short, MP1471AGJ-Z enters hiccup mode: it disables switching for ~20ms, then attempts restart. If the fault persists, it repeats the cycle - limiting average output current to ~300mA and die temperature to <110°C. Recovery occurs automatically once the short is removed and FB rises above 140mV.
What is the maximum allowable PCB trace length between BST and SW pins?
The BST capacitor must be placed directly between BST and SW pins with no series trace - i.e., zero-length connection. Any added trace inductance disrupts bootstrap capacitor recharge timing, causing high-side driver undervoltage and potential shoot-through. The recommended layout uses a 1µF 0603 ceramic capacitor soldered with pads overlapping both pins.
Does MP1471AGJ-Z support forced PWM mode at light loads?
No - MP1471AGJ-Z operates exclusively in AAM (PFM) mode below ~650mA and cannot be forced into continuous PWM. There is no external pin or register to disable AAM. For applications requiring constant-frequency operation at all loads, consider MP1477GQ or alternative parts with MODE pin control.
What is the thermal resistance (θJA) of MP1471AGJ-Z on a standard 4-layer PCB?
The datasheet specifies θJA = 100°C/W for the TSOT23-6 package on a JEDEC-standard 4-layer board (2 oz copper, 1-in² copper area under exposed pad). With proper thermal vias (≥4×0.3mm) connecting the exposed pad to inner ground planes, actual θJA can improve to ~75°C/W - enabling full 3A operation at TA ≤ 65°C.
MP1471AGJ-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):
- 4.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 14.72V
- Current - Output:
- 3A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
MP1471AGJ-Z FAQ
1.How can I place an order for MP1471AGJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1471AGJ-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 MP1471AGJ-Z reliable?
The price and inventory of MP1471AGJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP1471AGJ-Z is usually 5 days.
3.What payment methods are accepted for MP1471AGJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1471AGJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1471AGJ-Z?
MP1471AGJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1471AGJ-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 MP1471AGJ-Z?
For technical support, including MP1471AGJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1471AGJ-Z requirements.
6.How does Aetrix verify that MP1471AGJ-Z is sourced from the original manufacturer or authorized distributors?
All MP1471AGJ-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 MP1471AGJ-Z meets industry standards.
7.What is the process for return or replacement of MP1471AGJ-Z?
All MP1471AGJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1471AGJ-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 MP1471AGJ-Z part is unused and in its original packaging.
Return procedure for MP1471AGJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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