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Diodes Incorporated AP3405SHE-7
- Part No.:
- AP3405SHE-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AP3405SHE-7.pdf
- Description:
- IC REG BUCK ADJ 600MA UDFN20208
- Quantity:
- Payment:
- Shipping:
Inventory:3,583
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Product details
Overview
AP3405SHE-7 from Diodes Incorporated is a 2.0MHz fixed-frequency, current-mode PWM synchronous buck DC-DC converter in U-DFN2020-8 (Type E) package, delivering up to 600mA output current with input range 2.3V–5.5V and adjustable output 0.7V–5.5V. It integrates high-side/low-side MOSFETs, soft-start, UVLO, thermal shutdown, and hiccup-mode short-circuit protection-designed for compact post-regulation in space-constrained portable electronics.
For engineers reviewing the AP3405SHE-7 datasheet, AP3405SHE-7 pinout, AP3405SHE-7 application, or AP3405SHE-7 equivalent, key selection criteria include its 2.0MHz switching frequency enabling small external LC components, 0.6V feedback reference for precise output setting, and dual ground pins (AGND/PGND) for noise-sensitive analog/digital separation in battery-powered systems.
Technical Context
The AP3405 employs peak-current-mode control with slope compensation for stable operation across wide duty cycles and fast transient response. Its internal oscillator is fixed at 2.0MHz (±15%), supporting compact 2.2μH inductors and low-ESR ceramic capacitors.
Protection architecture includes input UVLO with 2.1V threshold and 100mV hysteresis, cycle-by-cycle overcurrent limit at 1A, thermal shutdown at +140°C with +40°C hysteresis, and hiccup-mode recovery after short-circuit removal when FB rises above 0.4V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.3V to 5.5V - supports single-cell Li-ion, Li-poly, and 3.3V/5V rail inputs without pre-regulation. |
| Output Current | 600mA continuous - sufficient for powering core logic, RF transceivers, or sensor subsystems in wearables. |
| Switching Frequency | 2.0MHz (typ.) - enables use of sub-3mm inductors and reduces output ripple without increasing filter size. |
| Feedback Voltage | 0.600V ±9mV - allows precise output programming via resistor divider; tolerance directly impacts output accuracy. |
| High-Side RDS(on) | 380mΩ (typ. at 3.6V) - determines conduction loss at light-to-moderate loads; paired with 300mΩ low-side switch. |
| Soft-Start Time | 150–300µs - controls inrush current during power-up, preventing input rail droop in multi-rail systems. |
| UVLO Threshold | 2.1V (rising), 2.0V (falling) - ensures clean startup/shutdown sequencing with battery voltage sag. |
Pinout & Package
The AP3405SHE-7 is housed in a thermally enhanced U-DFN2020-8 (Type E) package with 0.5mm pitch, 2.0×2.0mm body, and exposed thermal pad (EP) for PCB heat dissipation. Pin 1 is marked with a dot; Pins 1 and 2 are NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 3 (AGND) | Analog Ground Reference | Low-noise return path for feedback amplifier and bandgap reference; must be routed separately from power ground. |
| 4 (PGND) | Power Ground Return | High-current return for SW node and internal MOSFETs; connects directly to thermal pad and input/output capacitor grounds. |
| 5 (SW) | Switch Node Output | Drives external inductor; carries high di/dt pulses-requires tight layout with minimal loop area to reduce EMI. |
| 6 (VIN) | Main Power Input | Supplies internal bias and high-side switch; requires local 4.7μF ceramic capacitor placed near pin. |
| 7 (FB) | Voltage Feedback Input | Senses output via resistive divider; high-impedance node sensitive to noise-must avoid routing near SW or inductors. |
| 8 (EN) | Enable Control Input | Logic-level digital enable (1.0V high threshold); supports system-level power sequencing and standby mode control. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Topology | Integrated high-side (380mΩ) and low-side (300mΩ) MOSFETs eliminate external diode, improving efficiency by ~10% at 300mA vs. asynchronous design. |
| Current-Mode Control | Enables inherent line/load regulation and stable operation with ceramic output capacitors; eliminates need for external compensation network. |
| Hiccup-Mode SCP | After short-circuit detection (FB < 0.3V), IC shuts down, waits, then attempts restart-prevents thermal runaway while allowing automatic recovery when fault clears. |
| Dual Ground Separation | Independent AGND and PGND pins minimize coupling between sensitive analog circuitry and high-current switching paths, reducing output voltage noise. |
| Thermal Shutdown with Hysteresis | Shuts down at +140°C junction temperature and auto-restarts only after cooling to +100°C-prevents oscillatory behavior during sustained overload. |
Applications
| Smartband Power Management | Bluetooth LE Sensor Node |
|---|---|
Use Scenario: Wearable fitness tracker requiring regulated 1.8V supply for MCU and accelerometer from a 3.7V Li-poly battery. IC Role / Device Role / Timing Role: Primary step-down regulator providing stable 1.8V output with dynamic load handling during sensor sampling bursts. Use Value: 2.0MHz switching enables 2.2μH inductor and 10μF output capacitor-fitting within 8mm² PCB area while maintaining >85% efficiency at 200mA. | Use Scenario: Ultra-low-power environmental sensor node powered by coin cell, transmitting data via Bluetooth Low Energy every 5 seconds. IC Role / Device Role / Timing Role: Efficient post-regulator converting 3.0V battery voltage to 2.8V for RF transceiver, activated only during transmission windows. Use Value: 0µA shutdown current (ISTDB ≤ 5µA) and EN-controlled sequencing extend battery life beyond 12 months on CR2032. |
| USB-Powered IoT Hub | Medical Patch Monitor |
Use Scenario: Compact USB-powered gateway aggregating Zigbee and BLE sensor data, operating from 5V USB input. IC Role / Device Role / Timing Role: Secondary regulator generating 3.3V for microcontroller and 1.2V for memory from 5V bus, with tight line regulation. Use Value: ±1.5% line regulation over 4.5–5.5V input ensures consistent logic levels and ADC reference stability despite USB port voltage variation. | Use Scenario: Disposable skin-adhesive patch monitoring ECG and temperature, requiring ultra-thin profile and medical-grade reliability. IC Role / Device Role / Timing Role: Single-chip power solution delivering 1.8V to analog front-end and 3.3V to BLE radio from 3.6V primary cell. Use Value: U-DFN2020-8 package (0.6mm height) and RoHS/halogen-free construction meet ISO 10993 biocompatibility and regulatory requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP3415SHE-7 | Same U-DFN2020-8 package but 1.5MHz switching frequency; higher 1A output current rating; identical pinout and FB voltage. | Supports higher load currents and lower switching losses at medium loads; requires larger inductor (e.g., 4.7μH) due to lower frequency. | Select when >600mA output or lower EMI sensitivity is required; not drop-in due to different inductor sizing. |
| TPS62231DRYR | 2.25MHz fixed-frequency buck; 600mA rating; 0.6V FB; but uses WSON-6 package with no separate AGND/PGND pins. | Lacks dedicated analog/power ground separation-less suitable for noise-sensitive analog signal chains. | Prefer for cost-sensitive, non-analog-intensive applications where board space is tighter than noise margin. |
Compared with AP3405SHE-7, AP3415SHE-7 offers higher current headroom and lower switching loss at mid-load, while TPS62231DRYR trades ground separation for smaller footprint-making AP3405SHE-7 optimal for mixed-signal wearables needing both compactness and analog integrity.
Availability
AP3405SHE-7 is available at Aetrix Electronics and suitable for smart wearable devices, Bluetooth sensor nodes, USB-powered IoT hubs, and disposable medical monitors requiring stable component supply and long-term design continuity.
Supply support for AP3405SHE-7 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 integrated circuits, specializing in high-performance power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The AP3405 belongs to Diodes' high-frequency synchronous buck converter product line, engineered specifically for space-constrained, battery-operated portable electronics demanding high efficiency, low quiescent current, and robust protection in sub-2mm² footprints.
FAQ
What is the minimum recommended output capacitance for stable operation?
The AP3405SHE-7 requires a minimum 10μF ceramic output capacitor with ≤10mΩ ESR for stable 2.0MHz operation. Lower values risk instability or excessive ripple; X5R/X7R dielectrics are preferred for temperature stability. Layout must place capacitor within 3mm of PGND and FB pins.
Can the AP3405SHE-7 operate with an input voltage below 2.3V?
No-the AP3405SHE-7 has a hard UVLO threshold of 2.1V (rising), and guaranteed operation begins only at VIN ≥ 2.3V per datasheet specifications. Below this, the device remains disabled and provides no regulated output, even if EN is high.
How does the hiccup-mode short-circuit protection recover?
When FB drops below 0.3V indicating output short, the AP3405SHE-7 enters hiccup mode: it disables switching, waits ~10ms, then attempts restart. Recovery occurs automatically once FB rises above 0.4V-typically after short removal and output capacitor recharge through the body diode of the low-side FET.
Is the U-DFN2020-8 (Type E) package lead-free and RoHS compliant?
Yes-the AP3405SHE-7 is fully RoHS compliant (2011/65/EU), totally lead-free, and halogen/antimony-free ("Green" per Diodes' definition: Br+Cl <1500ppm, Sb <1000ppm). The marking "2V" on top surface confirms compliance per ordering information.
AP3405SHE-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-UFDFN 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):
- 2.3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.7V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 600mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-DFN2020-8 (Type E)
AP3405SHE-7 FAQ
1.How can I place an order for AP3405SHE-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3405SHE-7 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 AP3405SHE-7 reliable?
The price and inventory of AP3405SHE-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3405SHE-7 is usually 5 days.
3.What payment methods are accepted for AP3405SHE-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3405SHE-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3405SHE-7?
AP3405SHE-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3405SHE-7 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 AP3405SHE-7?
For technical support, including AP3405SHE-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3405SHE-7 requirements.
6.How does Aetrix verify that AP3405SHE-7 is sourced from the original manufacturer or authorized distributors?
All AP3405SHE-7 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 AP3405SHE-7 meets industry standards.
7.What is the process for return or replacement of AP3405SHE-7?
All AP3405SHE-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP3405SHE-7, 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 AP3405SHE-7 part is unused and in its original packaging.
Return procedure for AP3405SHE-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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