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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Diodes Incorporated AP3512EMPTR-G1

Name: AP3512EMPTR-G1
Brand: Diodes Incorporated
SKU: AP3512EMPTR-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP3512EMPTR-G1

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Datasheet:: AP3512EMPTR-G1.pdf

Description:: IC REG BUCK ADJ 2A 8SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP3512EMPTR-G1 from Diodes Incorporated is a 500 kHz fixed-frequency, current-mode PWM synchronous buck DC-DC converter in SO-8EP package, delivering up to 2 A output current with input voltage range 4.5 V to 18 V. It integrates low-R_DS(ON) N-channel MOSFETs, features programmable soft-start, hiccup-mode short-circuit protection, and operates across –40 °C to +85 °C for monitor, TV, and STB power rails.

For engineers reviewing the AP3512EMPTR-G1 datasheet, AP3512EMPTR-G1 pinout, AP3512EMPTR-G1 application, or AP3512EMPTR-G1 equivalent, key selection criteria include its 0.925 V feedback reference, 100 mΩ high-side R_DS(ON), thermal shutdown at +160 °C, and SO-8EP thermal resistance of 60 °C/W - critical for compact, thermally constrained 3.3 V/5 V point-of-load designs.

Technical Context

The AP3512EMPTR-G1 implements peak-current-mode control with internal transconductance error amplifier (G_EA = 800 µA/V) and slope compensation, enabling fast load transient response and stable loop compensation via the COMP pin. Its oscillator operates at 500 kHz (±18%) under normal conditions and drops to 180 kHz during short-circuit events for controlled hiccup recovery.

Protection architecture includes input UVLO (4.0 V threshold with 0.2 V hysteresis), output overvoltage lockout triggered at FB ≥ 1.1 V, and thermal shutdown at +160 °C with +30 °C hysteresis. The SS pin accepts 0.1 µF to GND for 15 ms soft-start, while EN enables logic-level on/off control with 1.5 V typical turn-on threshold.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5 V to 18 V - supports 5 V, 12 V, and 15 V intermediate bus systems without external LDO pre-regulation.
Output Current	2 A continuous - sufficient for powering SoCs, FPGAs, and interface ICs in consumer electronics.
Switching Frequency	500 kHz nominal - balances inductor size (e.g., 4.7 µH) and efficiency for compact PCB layouts.
Feedback Reference	0.925 V ±1.8% - sets output voltage via resistor divider; enables precise 3.3 V or 5 V regulation with <1% error.
High-Side R_DS(ON)	100 mΩ max - reduces conduction loss at 2 A, contributing to >90% efficiency at mid-load in typical 12 V → 3.3 V designs.
Thermal Resistance θ_JA	60 °C/W (SO-8EP) - enables higher power density than SO-8 (105 °C/W) with proper EP-to-GND thermal pad connection.
Soft-Start Time	15 ms with 0.1 µF on SS pin - prevents inrush current into downstream capacitors during power-up sequencing.

Pinout & Package

AP3512EMPTR-G1 is housed in an SO-8EP (exposed pad) package. The exposed pad (EP) must be soldered to a PCB ground plane to achieve specified θ_JA = 60 °C/W and ensure thermal reliability under 2 A load.

Pin/Terminal	Circuit Role	Design Meaning
1 BS	Bootstrap supply for high-side gate driver	Connects external bootstrap capacitor (e.g., 0.1 µF) between BS and SW to generate gate drive voltage above IN for NMOS high-side switch.
2 IN	Main power input	Accepts 4.5–18 V DC; requires local 10 µF ×2 ceramic input capacitance to suppress ripple and support peak current delivery.
3 SW	Switch node	Drives external inductor; connects to bootstrap capacitor; carries high di/dt switching waveform - requires tight layout with minimal loop area.
4 GND	Power and signal ground reference	Primary return path for power stage and control circuitry; must be connected to EP for thermal and noise integrity.
5 FB	Output voltage feedback sense	Monitors resistive divider output; regulates V_OUT by comparing to 0.925 V reference; triggers OVP at 1.1 V.
6 COMP	Error amplifier output / compensation node	Connects RC network to GND to stabilize control loop; transconductance = 800 µA/V enables robust phase margin tuning.
7 EN	Enable control input	Logic-compatible input (1.5 V typical turn-on); internal pull-down allows automatic startup when left floating or pulled up with 100 kΩ.
8 SS	Soft-start timing control	Current source (5 µA) charges external capacitor; 0.1 µF yields 15 ms ramp - prevents output overshoot and input droop.

Key Features

Feature	Design Value
Current-mode PWM control	Enables cycle-by-cycle current limiting and fast transient response (<10 µs) to load steps without external compensation.
Hiccup-mode short-circuit protection	Reduces average power dissipation during sustained overload by pulsing ON/OFF at ~1 Hz - prevents thermal runaway in fault conditions.
Integrated 100 mΩ/100 mΩ MOSFETs	Eliminates need for external high-side/low-side switches; reduces BOM count and layout complexity for 2 A buck applications.
Programmable soft-start	Prevents inrush current and output voltage overshoot via user-selected capacitor - critical for powering sensitive digital loads.
Full protection suite	Includes UVLO, OVP, OTP, and SCP - ensures system-level robustness without external supervision circuitry in consumer-grade designs.

Applications

Monitor Power Supply

Smart TV Main Rail

Use Scenario: Generating 3.3 V and 5 V rails from 12 V intermediate bus in LCD/LED monitor mainboard.

IC Role / Device Role / Timing Role: Primary synchronous buck regulator for FPGA configuration, MCU core, and interface ICs.

Use Value: High light-load efficiency extends standby time; SO-8EP thermal performance sustains 2 A output without heatsink in space-constrained chassis.

Use Scenario: Providing stable 3.3 V supply to SoC, audio codec, and HDMI receiver in 4K smart TV platforms.

IC Role / Device Role / Timing Role: Point-of-load converter with fast transient response to handle dynamic video processing loads.

Use Value: 500 kHz switching enables small 4.7 µH inductor; hiccup-mode SCP prevents damage during HDMI hot-plug surge events.

Set-Top Box Core Logic

Datacom Edge Device

Use Scenario: Delivering regulated 3.3 V to ARM-based application processor and DDR memory subsystem in cable/satellite STB.

IC Role / Device Role / Timing Role: Main DC-DC regulator with EN-controlled power sequencing synchronized to system reset.

Use Value: Programmable soft-start (15 ms) aligns with boot ROM timing requirements; 0.925 V reference ensures <1% output accuracy over temperature.

Use Scenario: Powering Ethernet PHY, microcontroller, and PoE interface ICs in industrial datacom edge nodes.

IC Role / Device Role / Timing Role: Isolated auxiliary rail generator with robust ESD tolerance (2000 V HBM) for noisy board environments.

Use Value: Input UVLO (4.0 V) prevents brownout operation during PoE negotiation; thermal shutdown (+160 °C) protects against enclosure overheating.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2315DJ-LF-Z (Monolithic Power)	4.5–24 V input, 2 A, 500 kHz, but uses external bootstrap diode; no integrated OVP on FB pin.	Lacks built-in output overvoltage protection - requires external sensing circuit for safety-critical rails.	Choose if wider VIN range is needed and OVP can be implemented externally; verify bootstrap diode thermal derating.
TPS54202DRCT (Texas Instruments)	4.5–18 V, 2 A, 500 kHz, but uses external MOSFETs; higher quiescent current (19 µA vs. 1.2 mA).	Requires external high/low-side FETs and gate drivers - increases BOM cost and layout complexity.	Prefer when design flexibility (e.g., custom R_DS(ON) trade-off) outweighs integration benefits and board space constraints.

Compared with MP2315DJ-LF-Z and TPS54202DRCT, AP3512EMPTR-G1 offers full protection integration, lower component count, and superior thermal performance in SO-8EP - making it optimal for cost-sensitive, space-limited consumer power supplies where reliability and ease of use are prioritized.

Availability

AP3512EMPTR-G1 is available at Aetrix Electronics and suitable for monitor, smart TV, and set-top box applications requiring stable component supply, RoHS-compliant packaging, and production-ready lead times.

Supply support for AP3512EMPTR-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The AP3512E belongs to Diodes' high-efficiency DC-DC converter product line, engineered specifically for cost-sensitive, high-volume consumer electronics requiring compact, fully protected, and thermally efficient point-of-load regulation.

FAQ

What is the recommended minimum output capacitance for AP3512EMPTR-G1?

The datasheet specifies 22 µF (×2) ceramic output capacitance for stable operation with 2 A load and 4.7 µH inductor. Using less than 22 µF risks increased output ripple (>50 mV p-p) and degraded load transient response, especially during 1 A–2 A step changes. X5R/X7R dielectrics with 10 V rating are advised for voltage coefficient stability.

Can AP3512EMPTR-G1 operate with input voltage below 4.5 V?

No - the device incorporates UVLO with 4.0 V nominal turn-on threshold and 0.2 V hysteresis. Below 3.8 V, the IC remains latched off and will not switch. Attempting to bias IN below 4.5 V violates Recommended Operating Conditions and may cause erratic behavior or failure to regulate.

How does the hiccup-mode short-circuit protection behave under sustained overload?

When FB falls below 0.3 V (indicating severe overload or short), the oscillator frequency drops to 180 kHz and the device enters hiccup mode: it attempts to restart every ~1 second, delivering brief current pulses. This limits average power dissipation to <1 W, preventing thermal damage while maintaining detectability for system-level fault logging.

Is the exposed pad (EP) of AP3512EMPTR-G1 electrically connected internally?

No - the EP is a thermal pad only, not tied to any internal circuit node. It must be connected exclusively to PCB ground plane using multiple thermal vias (≥4×0.3 mm) to achieve the rated θ_JA = 60 °C/W and ensure reliable 2 A operation. Leaving EP unconnected degrades thermal performance by >40%.

AP3512EMPTR-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):: 4.5V

Voltage - Input (Max):: 18V

Voltage - Output (Min/Fixed):: 0.925V

Voltage - Output (Max):: 16.2V

Current - Output:: 2A

Frequency - Switching:: 500kHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SO-EP

AP3512EMPTR-G1 FAQ

1.How can I place an order for AP3512EMPTR-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP3512EMPTR-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 AP3512EMPTR-G1 reliable?

The price and inventory of AP3512EMPTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3512EMPTR-G1 is usually 5 days.

3.What payment methods are accepted for AP3512EMPTR-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3512EMPTR-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP3512EMPTR-G1?

AP3512EMPTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP3512EMPTR-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 AP3512EMPTR-G1?

For technical support, including AP3512EMPTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3512EMPTR-G1 requirements.

6.How does Aetrix verify that AP3512EMPTR-G1 is sourced from the original manufacturer or authorized distributors?

All AP3512EMPTR-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 AP3512EMPTR-G1 meets industry standards.

7.What is the process for return or replacement of AP3512EMPTR-G1?

All AP3512EMPTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3512EMPTR-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 AP3512EMPTR-G1 part is unused and in its original packaging.

Return procedure for AP3512EMPTR-G1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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