My Inquiry
My Account
Allegro MicroSystems APEK4403GEU-01-T-DK
- Part No.:
- APEK4403GEU-01-T-DK
- Manufacturer:
- Allegro MicroSystems
- Package:
- Datasheet:
-
APEK4403GEU-01-T-DK.pdf
- Description:
- EVAL BOARD FOR A4403
- Quantity:
- Payment:
- Shipping:
Inventory:3,270
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
APEK4403GEU-01-T-DK from Allegro MicroSystems is a valley current-mode controlled synchronous buck converter IC designed for high-input-voltage, low-output-voltage DC/DC conversion. It delivers up to 3 A output current, supports 9–46 V input, achieves <50 ns minimum on-time, and operates at up to 2 MHz switching frequency-enabling compact designs in industrial power supplies and telecom infrastructure.
For engineers reviewing the APEK4403GEU-01-T-DK datasheet, APEK4403GEU-01-T-DK pinout, APEK4403GEU-01-T-DK application, or APEK4403GEU-01-T-DK equivalent, key selection criteria include its valley current-mode control architecture, user-configurable on-time via external resistor, integrated diagnostics (OCP, UVLO, TSD), thermally enhanced 4 mm × 4 mm QFN package with exposed pad, and soft-start functionality for inrush control.
Technical Context
The APEK4403GEU-01-T-DK implements valley current-mode control without slope compensation, enabling stable current limiting across 9–46 V input range. Its constant on-time modulation-set by VIN and external TON resistor-ensures feed-forward line regulation and maintains switching frequency within 0.45–2 MHz.
Internal diagnostics include valley-current overcurrent protection (3.6 A typical limit), VIN undervoltage lockout (6.4–7.5 V threshold with 0.7–1.1 V hysteresis), and overtemperature shutdown (165 °C trip). Light-load operation transitions automatically to PFM mode, and a top-off charge pump sustains gate drive under low-duty-cycle conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 9–46 V - supports wide-range industrial and telecom inputs without pre-regulation |
| Output Current | 3 A continuous - sufficient for powering FPGAs, SoCs, and multi-rail subsystems |
| Switching Frequency | 0.45–2 MHz - enables use of sub-10 µH inductors and low-ESR ceramic capacitors |
| Min. On-Time | 50 ns - allows high step-down ratios (e.g., 42 V → 3.3 V) at 1 MHz |
| Feedback Reference | 0.8 V ±1% - precise setpoint for accurate output regulation with standard resistor dividers |
| Quiescent Current | <100 µA - enables low-power standby modes in battery-backed or always-on systems |
| Thermal Resistance θJA | 36 °C/W - validated on JEDEC 4-layer PCB; requires thermal pad soldering for full rating |
Pinout & Package
The APEK4403GEU-01-T-DK is housed in a 16-contact, 4 mm × 4 mm × 0.75 mm QFN package with exposed thermal pad (suffix EU), lead-free and 100% matte tin plating. The exposed pad must be connected to SGND/GND plane via multiple thermal vias for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 9–46 V; powers internal regulators and high-side switch driver |
| LX | Switch node | Connects to inductor and recirculation diode; handles high dV/dt switching transients |
| BOOT | Bootstrap supply | Charges high-side gate driver capacitor; requires 22 nF ceramic between BOOT and LX |
| ISEN | Valley current sense input | Monitors voltage across external 50 mΩ sense resistors for cycle-by-cycle current limiting |
| FB | Feedback input | Compares output voltage (via resistor divider) against 0.8 V reference for regulation |
| TON | On-time configuration | Current-sinking pin; sets on-time (and thus fSW) via resistor to VIN (e.g., 100 kΩ ≈ 1 MHz) |
| SS | Soft-start timing | Charged by internal 10 µA current source; 47 nF yields ~3.8 ms ramp time to limit inrush |
| DIS | Enable/disable logic | Active-low enable; open-circuit disables device; 1 V threshold ensures noise immunity |
| GND / SGND | Power and sense ground | Separate GND (pins 6, 13–16) and SGND (pin 9) minimize noise coupling into current sense path |
| PAD | Exposed thermal pad | Must be soldered to solid GND plane; primary thermal path to PCB (θJP = 2 °C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Valley current-mode control | Eliminates need for slope compensation while maintaining stable current limit across full input range |
| User-configurable switching frequency | Set via single external resistor on TON pin-no external clock required, simplifies BOM and layout |
| Integrated diagnostics | Hardware-level OCP (valley-triggered), VIN UVLO with hysteresis, and TSD (165 °C) with 15 °C recovery margin |
| Light-load PFM operation | Automatically reduces switching frequency below ~200 mA load to maintain >85% efficiency at 10 mA |
| Top-off charge pump | Supplies gate drive during light-load PFM cycles, ensuring reliable high-side FET turn-on without external boost circuitry |
Applications
| Printers & Scanners | Cable/DSL Modems |
|---|---|
Use Scenario: Powering FPGA-based motion control and image processing subsystems requiring clean 3.3 V or 1.2 V rails from 12–48 V bus. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering regulated 3 A output with fast transient response to handle burst-mode imaging loads. Use Value: Sub-50 ns on-time enables direct 48 V → 3.3 V conversion at 1 MHz, reducing inductor size by >40% vs. 500 kHz alternatives. | Use Scenario: Generating 5 V/3 A for DOCSIS 3.1 PHY and packet processing SoCs in space-constrained modem chassis. IC Role / Device Role / Timing Role: High-efficiency main DC/DC converter operating from 12–42 V PoE-derived input with tight output tolerance. Use Value: 0.8 V feedback reference and ±2.5% output tolerance ensure compliance with SoC core voltage specs under full load and temperature range. |
| Industrial Control PLCs | High-Power LED Drivers |
Use Scenario: Supplying isolated I/O module logic rails (3.3 V, 5 V) from unregulated 24 V DC field bus with EMI-sensitive analog front-ends. IC Role / Device Role / Timing Role: Input-filter-tolerant buck controller with low EMI due to valley-mode control and fixed-frequency operation. Use Value: Feed-forward line regulation minimizes output voltage deviation during 24 V bus dips to 18 V, preserving real-time control loop stability. | Use Scenario: Constant-current LED string driver where buck output feeds external current-sense amplifier and MOSFET. IC Role / Device Role / Timing Role: Precision voltage source regulating LED driver IC bias rails (e.g., 5 V for op-amps and DACs) with ultra-low ripple. Use Value: 20 µF ceramic output capacitance requirement and optimized control loop deliver <10 mVpp ripple at 3 A, preventing visible LED flicker. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4420AGL-A-Z | Peak current-mode control; 3.5 A rating; 3.3–36 V input; no TON pin-fixed 500 kHz/1 MHz option | Requires slope compensation; less suitable for ultra-high step-down ratios (e.g., 42 V → 3.3 V) | Prefer when board space allows larger inductor and input range is ≤36 V |
| LM5164QPWPRQ1 | Wide Vin (3–65 V); 1.5 A; valley current-mode; adjustable frequency via RT pin; automotive-grade AEC-Q100 | Lower current rating; higher BOM cost; qualified for automotive but over-specified for industrial telecom | Prefer only if AEC-Q100 qualification or >46 V input is mandatory |
Compared with MPQ4420AGL-A-Z and LM5164QPWPRQ1, the APEK4403GEU-01-T-DK offers superior high-input-voltage step-down capability (46 V max), tighter output tolerance (±2.5%), and simpler frequency setting-making it optimal for space-constrained 42 V telecom and industrial applications needing 3 A at 1–2 MHz.
Availability
APEK4403GEU-01-T-DK is available at Aetrix Electronics and suitable for industrial control, telecom infrastructure, and high-power LED lighting applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for APEK4403GEU-01-T-DK 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
Allegro MicroSystems is a U.S.-based semiconductor company specializing in high-performance power ICs, magnetic sensors, and motor driver solutions for automotive, industrial, and consumer markets.
The A4403 product line is engineered for high-efficiency, high-voltage DC/DC conversion in space-constrained applications-emphasizing valley current-mode control, minimal external components, and robust fault protection for mission-critical power systems.
FAQ
What is the minimum recommended output capacitance for stable operation of the APEK4403GEU-01-T-DK?
The APEK4403GEU-01-T-DK requires a minimum 10 µF ceramic output capacitor (X5R/X7R) for control loop stability. The device is optimized for 20 µF total output capacitance-split across two 10 µF devices-to reduce ESL effects and maintain 90 kHz bandwidth. Using less than 10 µF risks loop instability and poor transient response; exceeding 1000 µF degrades phase margin and increases overshoot during load steps. The APEK4403GEU-01-T-DK datasheet specifies this range based on measured phase margin across temperature and load.
How does the APEK4403GEU-01-T-DK achieve high step-down ratios like 42 V to 3.3 V?
The APEK4403GEU-01-T-DK achieves high step-down ratios through its valley current-mode architecture and ultra-short 50 ns minimum on-time. At 42 V input and 3.3 V output, the theoretical duty cycle is ~8%; the APEK4403GEU-01-T-DK's 50 ns on-time allows stable 1 MHz operation without pulse-skipping. This eliminates the need for cascaded converters or pre-regulators. The APEK4403GEU-01-T-DK's feed-forward control also ensures consistent regulation despite input variation, making it ideal for such high-ratio applications.
Can the APEK4403GEU-01-T-DK operate without an external soft-start capacitor?
Yes-the APEK4403GEU-01-T-DK can operate without an external soft-start capacitor, but only if a 220 kΩ resistor is connected between SS and GND. This disables the soft-start function and initiates immediate startup. However, doing so risks inrush current exceeding 250 mA and output overshoot, especially with large output capacitors or pre-biased loads. The APEK4403GEU-01-T-DK datasheet recommends using a 47 nF capacitor (yielding ~3.8 ms ramp) for most applications to ensure safe start-up under full load.
What is the purpose of the separate SGND and GND pins on the APEK4403GEU-01-T-DK?
The APEK4403GEU-01-T-DK uses separate SGND (pin 9) and GND (pins 6, 13–16) to isolate the high-gain current-sense amplifier's reference from noisy power return paths. SGND connects directly to the external sense resistor's ground side and routes to the internal ISEN comparator, minimizing offset errors caused by IR drops in shared ground traces. GND pins handle bulk power return and bootstrap capacitor discharge. This separation ensures accurate valley-current sensing down to 180 mV across temperature-critical for the APEK4403GEU-01-T-DK's 3.6 A current limit accuracy.
Does the APEK4403GEU-01-T-DK require an external recirculation diode?
No-the APEK4403GEU-01-T-DK integrates a high-side MOSFET and uses synchronous rectification; no external recirculation diode is needed. The LX pin drives the external inductor directly, and the low-side switch is internal. However, if used in asynchronous mode (e.g., for cost reduction or reliability analysis), a Schottky diode rated for ≥3 A average current and ≥50 V PIV may be added from LX to GND-but this degrades efficiency by ~3–5% and is not supported in the APEK4403GEU-01-T-DK reference designs.
APEK4403GEU-01-T-DK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Main Purpose:
- DC/DC, Step Down
- Outputs and Type:
- 1 Non-Isolated Output
- Voltage - Output:
- -
- Current - Output:
- -
- Voltage - Input:
- -
- Regulator Topology:
- 9V ~ 46V
- Frequency - Switching:
- Buck
- Contents:
- -
- Utilized IC / Part:
- Board(s)
- Power - Output:
- A4403
APEK4403GEU-01-T-DK FAQ
1.How can I place an order for APEK4403GEU-01-T-DK through Aetrix?
Please submit a Request for Quotation (RFQ) for APEK4403GEU-01-T-DK 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 APEK4403GEU-01-T-DK reliable?
The price and inventory of APEK4403GEU-01-T-DK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APEK4403GEU-01-T-DK is usually 5 days.
3.What payment methods are accepted for APEK4403GEU-01-T-DK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APEK4403GEU-01-T-DK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APEK4403GEU-01-T-DK?
APEK4403GEU-01-T-DK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APEK4403GEU-01-T-DK 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 APEK4403GEU-01-T-DK?
For technical support, including APEK4403GEU-01-T-DK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APEK4403GEU-01-T-DK requirements.
6.How does Aetrix verify that APEK4403GEU-01-T-DK is sourced from the original manufacturer or authorized distributors?
All APEK4403GEU-01-T-DK 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 APEK4403GEU-01-T-DK meets industry standards.
7.What is the process for return or replacement of APEK4403GEU-01-T-DK?
All APEK4403GEU-01-T-DK units undergo pre-shipment inspection (PSI). If there is an issue with APEK4403GEU-01-T-DK, 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 APEK4403GEU-01-T-DK part is unused and in its original packaging.
Return procedure for APEK4403GEU-01-T-DK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
APEK4403GEU-01-T-DK Tags
-
DFR0571
DFRobot
-
DFR0379
DFRobot
-
DFR0205
DFRobot
-
1385
Adafruit Industries LLC
-
COM-15208
SparkFun Electronics
-
1944
Adafruit Industries LLC
-
2465
Adafruit Industries LLC
-
DC2468A
Analog Devices Inc.
-
DC2841A
Analog Devices Inc.
-
TPS552892EVM-111
Texas Instruments
-
TPS55289EVM-093
Texas Instruments
-
EPC9158
EPC
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
