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Diodes Incorporated AP3441SHE-7B
- Part No.:
- AP3441SHE-7B
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AP3441SHE-7B.pdf
- Description:
- IC REG BUCK ADJ 3A UDFN20208
- Quantity:
- Payment:
- Shipping:
Inventory:2,877
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Product details
Overview
AP3441SHE-7B from Diodes Incorporated is a 1 MHz, 3 A synchronous step-down DC-DC buck converter with integrated high-side P-FET and low-side N-FET, operating from 2.7 V to 5.5 V input and delivering adjustable output from 0.6 V to VIN. It features 55 µA no-load quiescent current, <1 µA shutdown current, and 100% duty-cycle capability for low-dropout operation in portable Li+/Li-polymer-powered systems such as notebook computers and set-top boxes.
For engineers reviewing the AP3441SHE-7B datasheet, AP3441SHE-7B pinout, AP3441SHE-7B application, or AP3441SHE-7B equivalent, key selection criteria include its internal compensation, hiccup-mode short-circuit protection (AP3441 variant), ±1.5% reference voltage accuracy, thermal shutdown at +150°C, and U-DFN2020-8 (Type E) package compatibility with high-density PCB layouts.
Technical Context
The AP3441SHE-7B implements current-mode control architecture with internal slope compensation, enabling fast transient response and stable regulation across line and load variations. Its error amplifier compares 0.6 V reference against FB voltage, driving a PWM comparator whose output controls gate drivers for integrated MOSFETs.
Functional block integration includes UVLO (2.5 V threshold with 0.2 V hysteresis), soft-start (1.0 ms typical), over-temperature protection (+150°C trip, +130°C recovery), and open-drain power-good (PG) signaling activated when VOUT is within ±20% of regulation. The AP3441 variant uses hiccup-mode SCP; latch-off is exclusive to AP3441L.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li+/Li-polymer, multi-cell alkaline/NiMH, and standard 3.3 V/5 V rails. |
| Output Voltage Range | 0.6 V to VIN - enables low-VDD logic supply and high-efficiency LDO replacement with 100% duty cycle. |
| Switching Frequency | 1 MHz (±20%) - allows compact external LC filter design with 2.2 µH inductor and dual 22 µF ceramic output caps. |
| Reference Voltage | 0.6 V ±1.5% - ensures ±18 mV absolute output tolerance at 1.2 V setting, critical for core voltage regulation. |
| Quiescent Current | 55 µA typical - minimizes battery drain during light-load sleep modes in always-on subsystems. |
| Shutdown Current | <1 µA - isolates input from output during system standby, preserving battery charge over extended idle periods. |
| Peak Output Current | 3 A - delivers full rated load without external current-sense resistor or loop compensation components. |
| RDS(ON) (HS/LG) | 72 mΩ / 53 mΩ - reduces conduction loss and improves full-load efficiency beyond 90% at 2.5 VOUT/3 A. |
Pinout & Package
AP3441SHE-7B is housed in a thermally enhanced U-DFN2020-8 (Type E) package with 0.5 mm pitch and exposed thermal pad (EP) for PCB ground connection. Dimensions: 2.0 mm × 2.0 mm × 0.56 mm height. Recommended solder pad layout per Diodes Inc. outline DFN2020-8E.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback input | Connects to resistor divider; regulates output by comparing against 0.6 V internal reference. |
| 2 PG | Power-good indicator | Open-drain output pulled up to VIN; asserts high when VOUT is within ±20% of target, enabling system sequencing. |
| 3 VIN | Main power input | Bias supply for internal circuitry and gate drivers; accepts 2.7–5.5 V with UVLO hysteresis. |
| 4 PGND | Power ground | Low-impedance return path for high-current LX switching node and internal FET sources. |
| 5 NC | No connection | Unbonded die pad; must remain floating-no PCB trace or copper pour connection. |
| 6 LX | Switch node | Drain connection of both internal MOSFETs; drives external inductor; requires low-inductance layout. |
| 7 EN | Enable control | Logic-level input: >1.5 V enables regulator; <0.4 V forces shutdown with sub-µA quiescent draw. |
| 8 SGND | Signal ground | Reference for FB, EN, and PG circuits; isolated from PGND to reduce noise coupling into feedback path. |
| EP | Exposed thermal pad | Non-electrical thermal interface; must be soldered to solid PCB ground plane for θJA = 70°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Internally compensated current-mode control eliminates need for external RC network, reducing BOM count and layout sensitivity. |
| Hiccup-mode short-circuit protection | AP3441 variant cycles on/off during sustained overload, limiting average power dissipation and preventing thermal runaway. |
| 100% duty-cycle operation | Enables dropout-free regulation down to VOUT = VIN − ILOAD×RDS(ON), critical for battery end-of-life support. |
| Pulse-skip mode at light load | Maintains >85% efficiency at 10 mA output by skipping switching cycles, avoiding linear-regulator-like quiescent penalty. |
| Integrated MOSFETs with ultra-low RDS(ON) | 72 mΩ (HS) + 53 mΩ (LS) reduces conduction loss, enabling 3 A continuous output without external switches or heatsinking. |
| Thermal shutdown with hysteresis | +150°C trip / +130°C recovery prevents latch-up during momentary overload while ensuring safe restart after cooling. |
Applications
| Portable Notebook Power Rail | Set-Top Box Core Supply |
|---|---|
|
Use Scenario: Regulating 5 V input to 1.2 V/3 A for CPU core logic in space-constrained clamshell notebooks. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing dynamic load transients during processor frequency scaling. Use Value: 1 MHz switching enables use of 2.2 µH inductor and compact 2×22 µF ceramic output caps, reducing board area by 40% vs. lower-frequency alternatives. |
Use Scenario: Generating stable 3.3 V/2.5 A supply for SoC and HDMI PHY in consumer STB platforms. IC Role / Device Role / Timing Role: Post-regulation DC-DC stage following AC/DC adapter, rejecting ripple and supporting hot-plug events. Use Value: Hiccup-mode SCP prevents catastrophic failure during HDMI cable short events, allowing automatic recovery without system reset. |
| Li-Polymer Battery-Powered PAD | Industrial IoT Sensor Hub |
|
Use Scenario: Powering ARM Cortex-M7 MCU and display driver from single-cell 3.7 V Li-polymer battery with 2.8 V–4.2 V range. IC Role / Device Role / Timing Role: Main system regulator maintaining 1.8 V output across full battery discharge curve using 100% duty cycle. Use Value: 55 µA quiescent current extends shelf life to >12 months in deep-sleep mode; <1 µA shutdown preserves battery during storage. |
Use Scenario: Providing 2.5 V/3 A rail for wireless MCU, RF transceiver, and analog sensor front-end in sealed outdoor enclosure. IC Role / Device Role / Timing Role: High-reliability power stage with thermal shutdown and UVLO protecting against ambient temperature excursions and brownouts. Use Value: ±1.5% reference accuracy ensures ADC reference stability and sensor measurement repeatability across -40°C to +85°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | 2.5–5.5 V input; 2 A max output; 2 MHz switching; requires external compensation. | Limited to 2 A output; higher frequency demands tighter layout but smaller inductors. | Select when board space is constrained and 2 A suffices; avoid if 3 A load or internal compensation is mandatory. |
| TPS62130ARGTR | 3–17 V input; 3 A output; 2.5 MHz; integrated compensation; 17 µA IQ. | Wider input range suits 12 V industrial rails; lower IQ benefits ultra-low-power sleep states. | Choose for multi-rail systems needing 3–17 V flexibility; not suitable for ≤5.5 V-only designs due to higher minimum VIN. |
Compared with MP2451DT-LF-Z and TPS62130ARGTR, AP3441SHE-7B uniquely balances 3 A capability, 2.7–5.5 V input compatibility, internal compensation, and sub-1 µA shutdown-making it optimal for single-cell battery systems where size, simplicity, and deep-sleep efficiency are co-prioritized.
Availability
AP3441SHE-7B is available at Aetrix Electronics and suitable for notebook computer power management, set-top box core regulation, and portable PAD battery-powered systems requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for AP3441SHE-7B 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 high-performance power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The AP3441 belongs to Diodes' high-efficiency synchronous buck converter product line, designed specifically for space- and power-constrained portable electronics requiring minimal external components and robust protection under variable battery conditions.
FAQ
What is the maximum achievable output voltage for AP3441SHE-7B?
The AP3441SHE-7B supports output voltages from 0.6 V up to the input voltage (VIN), enabled by its 100% duty-cycle operation. For example, with VIN = 5.0 V, VOUT can be set to 4.95 V using appropriate R1/R2 feedback resistors. This feature is essential for applications requiring minimal dropout, such as maintaining logic rail voltage near battery end-of-discharge.
Does AP3441SHE-7B require an external bootstrap capacitor?
No. The AP3441SHE-7B integrates all necessary gate drive circuitry-including charge pump and level-shifting-within the IC. Unlike controllers requiring external high-side driver support, this device operates the internal P-FET directly from VIN without auxiliary capacitors, simplifying layout and reducing component count.
How does the hiccup-mode short-circuit protection behave during fault conditions?
When output short-circuit is detected (FB < 0.42 V), the AP3441SHE-7B disables switching, waits ~30 ms, then attempts restart. If the fault persists, it repeats the cycle-limiting average power dissipation to safe levels. Recovery occurs automatically once the short is removed and FB rises above 0.42 V, eliminating need for manual reset or external supervision.
Can AP3441SHE-7B be used with ceramic output capacitors only?
Yes. The AP3441SHE-7B is optimized for ceramic output capacitors, with internal compensation tuned for typical 2×22 µF configurations. Its current-mode control and low ESR tolerance eliminate need for electrolytic or tantalum types. Using ceramics ensures low output ripple (<20 mVPP at 3 A), fast transient response, and reliable operation across temperature.
AP3441SHE-7B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 3A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-DFN2020-8 (Type E)
AP3441SHE-7B FAQ
1.How can I place an order for AP3441SHE-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3441SHE-7B 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 AP3441SHE-7B reliable?
The price and inventory of AP3441SHE-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3441SHE-7B is usually 5 days.
3.What payment methods are accepted for AP3441SHE-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3441SHE-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3441SHE-7B?
AP3441SHE-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3441SHE-7B 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 AP3441SHE-7B?
For technical support, including AP3441SHE-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3441SHE-7B requirements.
6.How does Aetrix verify that AP3441SHE-7B is sourced from the original manufacturer or authorized distributors?
All AP3441SHE-7B 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 AP3441SHE-7B meets industry standards.
7.What is the process for return or replacement of AP3441SHE-7B?
All AP3441SHE-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP3441SHE-7B, 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 AP3441SHE-7B part is unused and in its original packaging.
Return procedure for AP3441SHE-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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