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Diodes Incorporated AP3441LSHE-7B
- Part No.:
- AP3441LSHE-7B
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AP3441LSHE-7B.pdf
- Description:
- IC REG BUCK ADJ 3A UDFN20208
- Quantity:
- Payment:
- Shipping:
Inventory:3,125
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Product details
Overview
AP3441LSHE-7B from Diodes Incorporated is a 3A synchronous step-down DC-DC buck converter with integrated high-side P-FET and low-side N-FET, operating at 1MHz fixed frequency. It accepts 2.7V–5.5V input, delivers adjustable output from 0.6V to VIN, features 0.6V ±1.5% reference voltage, 55µA no-load quiescent current, and 100% duty-cycle capability for low-dropout operation in portable Li+/Li-polymer-powered systems.
For engineers reviewing the AP3441LSHE-7B datasheet, AP3441LSHE-7B pinout, AP3441LSHE-7B application, or AP3441LSHE-7B equivalent, key selection criteria include latch-off short-circuit protection, over-voltage protection (OVP), thermal shutdown behavior, and U-DFN2020-8 (Type E) package compatibility with high-density PCB layouts.
Technical Context
The AP3441LSHE-7B implements current-mode control architecture with internal slope compensation, enabling fast transient response and stable regulation across line/load variations. Its functional block includes a 0.6V bandgap reference, PWM comparator, oscillator, soft-start circuit, and dedicated latch-off protection logic for both short-circuit and over-voltage events.
Unlike the AP3441 variant, the AP3441L version integrates OVP with 120% threshold detection and 40µs delay, plus latch-off SCP triggered at VFB < 0.42V - requiring full power cycle recovery. The device supports pulse-skip mode at light loads and achieves 95% peak efficiency at 3A with 2.2µH inductor and dual 22µF ceramic output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li+/Li-polymer, multi-cell alkaline/NiMH, and USB-powered systems without external LDO pre-regulation. |
| Output Voltage Range | 0.6V to VIN - enables direct regulation to core voltages (e.g., 0.6V for ultra-low-power MCUs) or rail-to-rail tracking in post-regulation stages. |
| Switching Frequency | 1MHz (±20%) - allows compact 2.2µH inductors and minimizes EMI in noise-sensitive audio/video subsystems. |
| Max Output Current | 3A continuous - sustained under thermal limits with proper PCB copper area and exposed pad grounding per U-DFN2020-8 layout guidelines. |
| Quiescent Current | 55µA typical - extends battery runtime in always-on monitoring circuits without compromising startup time or regulation accuracy. |
| Feedback Reference | 0.6V ±1.5% - ensures ±18mV absolute output tolerance at 1.2V setting, critical for DDR memory VDDQ and FPGA core rails. |
| Shutdown Current | <1µA - isolates input from output during deep sleep, preventing battery drain in handheld devices with long standby periods. |
| RDS(ON) | 72mΩ (HS), 53mΩ (LS) - reduces conduction loss at 3A, enabling >90% efficiency at 1.8V/3A with minimal thermal rise on 2-layer boards. |
Pinout & Package
AP3441LSHE-7B is housed in a thermally enhanced U-DFN2020-8 (Type E) package (2.0mm × 2.0mm × 0.6mm), featuring an exposed thermal pad (EP) for direct PCB ground plane connection to achieve θJA = 70°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback input | Connects to resistor divider; internal error amplifier compares to 0.6V reference to regulate output voltage precisely. |
| 2 PG | Power good indicator | Open-drain output pulled to VIN when VOUT is within ±20% of target; used for system power sequencing and fault flagging. |
| 3 VIN | Main supply input | Accepts 2.7–5.5V unregulated input; powers internal bias circuitry and high-side gate driver. |
| 4 PGND | Power ground | Low-impedance return path for high-current LX switching node and internal MOSFET sources; must be tied to EP and local ground pour. |
| 5 NC | No connection | Unbonded die pad; must remain floating - no trace or solder mask opening required. |
| 6 LX | Switch node | Drain terminals of internal HS and LS FETs; connects directly to inductor; requires tight loop layout to minimize EMI and ringing. |
| 7 EN | Enable control | Active-high logic input; ≥1.5V enables regulator, ≤0.4V forces shutdown with <1µA current draw. |
| 8 SGND | Signal ground | Analog reference for FB, PG, and EN; isolated from PGND to prevent noise coupling into feedback path. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Compensation | No external RC network required - simplifies BOM and layout while maintaining stability across 0.6–5.5V output range and 1–100µF output capacitance. |
| Latch-Off SCP & OVP | AP3441L-specific protection: short-circuit or over-voltage events force permanent shutdown until VIN/EN recycle - prevents repeated fault stress in safety-critical power domains. |
| 100% Duty Cycle Operation | Enables dropout as low as 100mV at 3A - supports 3.3V→3.0V or 2.5V→2.4V post-regulation where input may dip near output voltage. |
| Pulse-Skip Mode | Maintains >85% efficiency at 10mA load - eliminates audible coil whine and extends battery life in intermittent-sensing applications like IoT sensors. |
| Thermal Shutdown | Activates at +150°C junction temperature with +20°C hysteresis - provides robust protection during overload or poor heatsinking without latch behavior. |
| UVLO with Hysteresis | 2.5V turn-on / 2.3V turn-off threshold - prevents oscillation during battery discharge and avoids brown-out resets in portable equipment. |
Applications
| Portable Notebook Core Rail | Set-Top Box SoC Power |
|---|---|
|
Use Scenario: Regulating 1.2V CPU core voltage from a 3.3V intermediate rail in fanless notebooks with thermal constraints. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering 3A continuous current with tight output tolerance and fast load-step response. Use Value: 55µA quiescent current extends battery life during idle; 100% duty cycle maintains regulation as 3.3V rail sags under system load. |
Use Scenario: Generating 1.8V DDR3 memory supply from 5V main rail in cable/satellite STBs with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency post-regulator with 1MHz switching to avoid interference with video clock harmonics. Use Value: Integrated MOSFETs eliminate external FET drive complexity; pulse-skip mode suppresses switching noise during video decode pauses. |
| Li-Polymer Powered PAD | USB-Powered Industrial Sensor Hub |
|
Use Scenario: Stepping down single-cell Li+/Li-polymer (3.0–4.2V) to 2.5V for display backlight driver ICs in tablets. IC Role / Device Role / Timing Role: Input-capable buck converter with UVLO hysteresis to prevent premature shutdown during battery sag. Use Value: 0.6V reference enables precise 2.5V output via 317kΩ/100kΩ divider; latch-off SCP protects against display short-circuit faults. |
Use Scenario: Providing 3.3V system rail from 5V USB port in ruggedized sensor nodes deployed in factory environments. IC Role / Device Role / Timing Role: Robust DC-DC regulator with thermal shutdown and OVP to withstand USB voltage surges and ambient temperature swings. Use Value: U-DFN2020-8 package fits space-constrained modules; 72mΩ/53mΩ RDS(ON) sustains 3A output with <15°C junction rise on 2oz copper. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP3441SHE-7B | Uses hiccup-mode SCP and non-latching OVP; identical electrical specs otherwise. | Suitable for systems requiring automatic recovery after transient shorts (e.g., motor drivers). | Select AP3441SHE-7B if fault resilience outweighs safety-critical shutdown requirements. |
| MP2451DT-LF-Z | 3A, 2.5–5.5V input, 1.2MHz, but lacks OVP and uses external compensation. | Requires additional components for stability; no built-in over-voltage protection. | Choose MP2451DT-LF-Z only when board space permits extra resistors/capacitors and OVP is handled externally. |
Compared with AP3441SHE-7B, the AP3441LSHE-7B trades automatic recovery for deterministic fault containment; versus MP2451DT-LF-Z, it delivers lower BOM count and higher functional integration at the cost of less flexible compensation tuning.
Availability
AP3441LSHE-7B is available at Aetrix Electronics and suitable for portable notebook core rails, set-top box SoC power, Li-polymer-powered PADs, and USB-powered industrial sensor hubs requiring stable component supply and guaranteed long-term sourcing.
Supply support for AP3441LSHE-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-efficiency power management solutions for consumer, industrial, and computing markets.
The AP3441/L series belongs to Diodes' high-current synchronous buck regulator product line, designed specifically for space-constrained, battery-operated applications demanding low quiescent current, latch-off fault protection, and seamless integration with Li+/Li-polymer battery systems.
FAQ
What is the difference between AP3441LSHE-7B and AP3441SHE-7B?
The AP3441LSHE-7B implements latch-off short-circuit and over-voltage protection, requiring power cycling to recover after fault events. In contrast, the AP3441SHE-7B uses hiccup-mode SCP and non-latching OVP, enabling automatic restart once the fault condition clears. Both share identical pinout, package, and electrical specifications except for protection behavior.
Can AP3441LSHE-7B operate with 100% duty cycle, and what does that enable?
Yes - the AP3441LSHE-7B supports true 100% duty cycle operation, allowing VOUT to track VIN down to a dropout of ~100mV at 3A. This enables reliable regulation in scenarios where input voltage sags close to the output level, such as powering 3.0V rails from a discharging 3.3V intermediate supply or 2.4V from a 2.5V source in portable systems.
How should the exposed pad (EP) of the U-DFN2020-8 package be connected?
The exposed pad must be soldered to a solid PCB ground plane using at least nine thermal vias (0.3mm diameter, spaced ≤1mm apart) connecting to inner or bottom-layer copper pours. This configuration achieves the specified θJA = 70°C/W and prevents thermal shutdown under 3A continuous load. Leaving EP unconnected degrades thermal performance by >40°C/W.
Is external compensation required for AP3441LSHE-7B stability?
No - the AP3441LSHE-7B features fully internal compensation, eliminating the need for external Type-II or Type-III networks. Stability is guaranteed across its entire output voltage range (0.6V to VIN), input voltage range (2.7V to 5.5V), and recommended output capacitor values (10µF to 100µF ceramic), provided layout follows the datasheet's high-current loop and grounding guidelines.
AP3441LSHE-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)
AP3441LSHE-7B FAQ
1.How can I place an order for AP3441LSHE-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3441LSHE-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 AP3441LSHE-7B reliable?
The price and inventory of AP3441LSHE-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3441LSHE-7B is usually 5 days.
3.What payment methods are accepted for AP3441LSHE-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3441LSHE-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3441LSHE-7B?
AP3441LSHE-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3441LSHE-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 AP3441LSHE-7B?
For technical support, including AP3441LSHE-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3441LSHE-7B requirements.
6.How does Aetrix verify that AP3441LSHE-7B is sourced from the original manufacturer or authorized distributors?
All AP3441LSHE-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 AP3441LSHE-7B meets industry standards.
7.What is the process for return or replacement of AP3441LSHE-7B?
All AP3441LSHE-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP3441LSHE-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 AP3441LSHE-7B part is unused and in its original packaging.
Return procedure for AP3441LSHE-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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