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Diodes Incorporated AP3171MPTR-G1
- Part No.:
- AP3171MPTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
AP3171MPTR-G1.pdf
- Description:
- IC REG BUCK ADJ 1.5A/2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,386
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Product details
Overview
AP3171MPTR-G1 from Diodes Incorporated is a synchronous buck converter IC with integrated high/low-side MOSFETs, Qualcomm QC 2.0 protocol decoder, and CC/CV control logic. It delivers programmable output voltages (5V/2A, 9V/2A, or 12V/1.5A) based on D+/D- handshake, supports cable compensation via external resistor, and operates at fixed 120 kHz switching frequency with DCM at light load for efficiency. Used in automotive USB power adapters requiring fast-charge compliance.
For engineers reviewing the AP3171MPTR-G1 datasheet, AP3171MPTR-G1 pinout, AP3171MPTR-G1 application, or AP3171MPTR-G1 equivalent, key selection factors include QC 2.0 voltage negotiation behavior, ±1.5% CV accuracy at 5V, integrated MOSFET RDS(ON) (100 mΩ HS / 45 mΩ LS), OVP/UVP thresholds per output level, and SO-8EP thermal performance (θJA = 63°C/W).
Technical Context
The AP3171 implements a current-mode PWM controller with zero-current detection (ZCD) to enable discontinuous conduction mode (DCM) during light/no-load conditions, improving light-load efficiency. Its internal QC 2.0 decoder interprets D+/D- voltage combinations to select one of three regulated output profiles: 5V/2A, 9V/2A, or 12V/1.5A.
Constant-voltage regulation uses VSEN feedback with ±1.5% accuracy at 5V and ±2.5% at 9V/12V; constant-current control relies on OUT/VSEN differential sensing with ±4% accuracy at 5V and ±5% at higher voltages. Cable compensation is implemented via CABLE pin with adjustable gain (VCABLE = IO × RSENSE × 129.5k / RCABLE).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8.7V to 40V - Supports wide automotive battery range including cold-crank transients. |
| Switching Frequency | 120 kHz fixed - Enables predictable EMI filtering and inductor sizing without frequency spread. |
| Output Voltage Options | 5V/2A, 9V/2A, 12V/1.5A - Set by D+/D- handshake; defaults to 5V/2A for legacy USB devices. |
| CV Accuracy | ±1.5% at 5V - Ensures stable charging voltage for Li-ion batteries in portable devices. |
| CC Accuracy | ±4% at 5V - Maintains precise current limit during constant-current battery charging phase. |
| OVP Thresholds | 5.80V @5V, 10.44V @9V, 13.92V @12V - Programmable overvoltage protection aligned with output rail. |
| Thermal Protection | OTP trigger at +160°C, recovery at +140°C - Prevents thermal runaway during sustained overload. |
Pinout & Package
The AP3171MPTR-G1 is housed in an SO-8EP package with exposed thermal pad (PHASE) on the underside for enhanced heat dissipation. The package measures 4.90 mm × 6.00 mm × 1.75 mm and features gull-wing leads compatible with standard reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | IC supply and HV input rail connection | Provides bias for internal regulator and gate drivers; requires local 10 µF ceramic decoupling to GND. |
| CABLE | Cable compensation adjustment node | Connects to external resistor to set compensation voltage proportional to output current and sense resistance. |
| D+ | USB data line input | Participates in QC 2.0 handshake; interpreted with D- to determine target output voltage/current profile. |
| D- | USB data line input | Paired with D+ to decode QC 2.0 protocol states; includes glitch filtering (1.25 s high, 2.5 ms low). |
| OUT | Current-sense input (high-side) | Connected to input side of current-sense resistor; used for CC loop and peak current limiting. |
| VSEN | Voltage-sense input | Monitors output voltage at load; enables accurate CV regulation and UVP/OVP detection. |
| CMP | Error amplifier output | Drives external compensation network to stabilize control loop; connects to RC network between CMP and GND. |
| GND | Power and signal ground reference | Common return for controller, drivers, and sense circuitry; must be low-impedance and tied to exposed PHASE pad. |
| PHASE | Switch node connection | Exposed thermal pad connected to source of low-side MOSFET and inductor input; requires soldered thermal land. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated QC 2.0 Decoder | Eliminates need for external microcontroller or protocol IC in fast-charge adapter designs. |
| Synchronous Buck Architecture | Reduces conduction loss vs. diode rectification; enables >90% efficiency at full load across all output profiles. |
| Adjustable Cable Compensation | Compensates for IR drop in USB cables up to 1.5 m length using single external resistor. |
| Discontinuous Conduction Mode (DCM) | Improves light-load efficiency by reducing switching losses when output current falls below critical conduction threshold. |
| Multi-Level Protection Suite | Includes UVLO (7.0 V), OVP/UVP per output rail, peak current limit (4 A), and OTP with hysteresis (+160°C/+140°C). |
Applications
| Car Charger | QC 2.0-Compatible Wall Adapter |
|---|---|
|
Use Scenario: 12V automotive battery powering dual-port USB-A fast-charging module. IC Role / Device Role / Timing Role: Primary DC/DC regulator and QC 2.0 protocol interpreter managing voltage negotiation and CC/CV control. Use Value: Delivers 12V/1.5A output to support tablets while maintaining backward compatibility with 5V/2A smartphones via automatic fallback. |
Use Scenario: Compact AC/DC adapter with secondary-side QC 2.0 buck stage for universal USB fast charging. IC Role / Device Role / Timing Role: Final-stage synchronous buck converter implementing dynamic voltage selection and precision current limiting. Use Value: Achieves <100 mW no-load power consumption via DCM and eliminates need for optocoupler-based feedback in isolated topologies. |
| Automotive Rear-Seat Power Module | Industrial USB-Powered Device Charger |
|
Use Scenario: Integrated rear-seat entertainment system supplying regulated power to multiple USB peripherals. IC Role / Device Role / Timing Role: High-efficiency buck regulator with cable compensation to maintain voltage at device connector despite long wiring harnesses. Use Value: Compensates for up to 300 mV IR drop across 2 m of 24 AWG cable, ensuring 4.7 V minimum at load under 2 A. |
Use Scenario: DIN-rail mounted industrial charger for handheld test equipment requiring reliable 9V/2A QC 2.0 output. IC Role / Device Role / Timing Role: Robust power conversion IC with extended temperature operation (-40°C to +85°C ambient) and thermal shutdown. Use Value: Sustains full 18 W output in enclosed enclosures via SO-8EP thermal pad and 63°C/W junction-to-ambient rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications with QC 2.0 support.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4420AGL-A | Supports QC 3.0 and PPS; no integrated QC 2.0 decoder - requires external MCU for handshake. | Enables next-gen fast-charge protocols but adds firmware complexity and BOM cost. | Select if future-proofing for QC 3.0/PPS is required and MCU resources are available. |
| RT7207K | Fixed 5V/9V/12V outputs; lacks cable compensation and adjustable CC accuracy. | Limited to fixed-output applications without dynamic cable loss correction. | Choose for cost-sensitive designs where cable length is short and fixed OVP thresholds suffice. |
Compared with MPQ4420AGL-A and RT7207K, the AP3171MPTR-G1 uniquely integrates QC 2.0 decoding, cable compensation, and tight CV/CC accuracy in a single SO-8EP package - simplifying design for automotive and compact adapter applications without sacrificing precision or safety.
Availability
AP3171MPTR-G1 is available at Aetrix Electronics and suitable for car chargers, QC 2.0 wall adapters, and automotive rear-seat power modules requiring stable component supply, RoHS/Green compliance, and production-ready thermal performance.
Supply support for AP3171MPTR-G1 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and connectivity solutions for automotive, industrial, and consumer markets.
The AP3171 belongs to Diodes' Quick Charge–compatible power conversion product line, designed specifically for compact, high-efficiency USB fast-charge applications in automotive and portable electronics.
FAQ
What is the recommended current-sense resistor value for 5V/2A operation?
The default RSENSE is 27.27 mΩ, selected to achieve 110% full-scale current (2.2 A) at the VCS_5V reference of 60.0 mV. This ensures accurate CC regulation across temperature and process variation while allowing headroom for transient overcurrent events.
How does cable compensation adjust output voltage under load?
Cable compensation adds a voltage offset (VCABLE) to the VSEN feedback path proportional to output current and RSENSE. With RCABLE = 17.6 kΩ, VCABLE = IO × 27.27 mΩ × 129.5k / 17.6k ≈ IO × 200 mV, counteracting IR drop to maintain target voltage at the device connector.
Can the AP3171 operate without D+/D- connection?
Yes - when D+/D- are unconnected or grounded, the AP3171 defaults to 5V/2A output configuration, ensuring full backward compatibility with standard USB devices that do not implement QC 2.0 handshake.
What is the maximum allowable input voltage during cold-crank conditions?
The absolute maximum VCC rating is 42 V, and the recommended operating range extends to 40 V. This accommodates automotive cold-crank transients up to 40 V for ≥50 ms, provided thermal limits and UVLO hysteresis (7.0 V to 8.7 V) are respected in system-level design.
AP3171MPTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 10V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V, 9V, 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A, 2A
- Frequency - Switching:
- 120kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO-EP
AP3171MPTR-G1 FAQ
1.How can I place an order for AP3171MPTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3171MPTR-G1 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 AP3171MPTR-G1 reliable?
The price and inventory of AP3171MPTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3171MPTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3171MPTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3171MPTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3171MPTR-G1?
AP3171MPTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3171MPTR-G1 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 AP3171MPTR-G1?
For technical support, including AP3171MPTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3171MPTR-G1 requirements.
6.How does Aetrix verify that AP3171MPTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3171MPTR-G1 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 AP3171MPTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3171MPTR-G1?
All AP3171MPTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3171MPTR-G1, 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 AP3171MPTR-G1 part is unused and in its original packaging.
Return procedure for AP3171MPTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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