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Analog Devices Inc. ADP2303ARDZ
- Part No.:
- ADP2303ARDZ
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
ADP2303ARDZ.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:297
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Product details
Overview
ADP2303ARDZ from Analog Devices is a nonsynchronous step-down DC-DC regulator with integrated high-side MOSFET, delivering up to 3 A continuous output current at 700 kHz switching frequency, ±1.5% output voltage accuracy, and 0.8 V minimum adjustable output - used in intermediate power rail conversion for industrial instrumentation and communications systems.
For engineers reviewing the ADP2303ARDZ datasheet, ADP2303ARDZ pinout, ADP2303ARDZ application, or ADP2303ARDZ equivalent, key selection criteria include input voltage range (3.0–20 V), thermal shutdown threshold (150°C), precision enable hysteresis (100 mV), power-good timing (32 clock cycles), and bootstrap voltage regulation (5.0 V typical).
Technical Context
The ADP2303ARDZ employs fixed-frequency peak current-mode PWM control with automatic transition to pulse-skip mode at light loads, enabling high efficiency across wide load ranges. Its internal compensation, integrated soft start (2048 clock cycles), and slope compensation prevent subharmonic oscillation above 50% duty cycle.
It features a precision enable input (1.2 V threshold, 100 mV hysteresis) and power-good open-drain output with 87.5% rising threshold and 2.5% hysteresis. Protection includes undervoltage lockout (2.4 V falling, 2.7 V rising), overcurrent limit (4.6–6.4 A), and thermal shutdown with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 20 V - supports wide-input industrial and automotive supply rails without external pre-regulation. |
| Max Output Current | 3 A continuous - enables single-chip solution for demanding point-of-load applications like FPGA core supplies. |
| Switching Frequency | 700 kHz (595–805 kHz) - allows compact 1–15 µH inductors and ceramic output capacitors, reducing board area. |
| Feedback Reference | 0.800 V ±1.5% - sets output voltage via external resistor divider; enables 0.8 V minimum output for low-voltage logic rails. |
| Thermal Shutdown | 150°C junction, 15°C hysteresis - protects against sustained overload or poor PCB thermal design; resumes only after die cools to ≤135°C. |
| Power-Good Accuracy | 87.5% rising / 85% falling threshold - provides reliable sequencing signal for downstream devices with defined voltage margin. |
| Enable Threshold | 1.20 V ±80 mV with 100 mV hysteresis - enables precise supply sequencing and programmable UVLO using resistive dividers. |
Pinout & Package
ADP2303ARDZ is housed in an 8-lead SOIC_N package with exposed paddle (EPAD), optimized for thermal dissipation in high-current operation. The exposed pad must be soldered to a PCB ground plane per JEDEC J-STD-020 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply | Provides floating gate drive voltage for internal high-side MOSFET; requires 0.1 µF X5R/X7R capacitor to SW. |
| VIN | Main power input | Accepts 3.0–20 V input; must be bypassed with ceramic capacitor directly to GND for stability and EMI reduction. |
| EN | Enable control | Logic-level input with 1.2 µA internal pull-down; enables startup sequencing and programmable UVLO via resistive divider. |
| PGOOD | Power-good indicator | Open-drain output signaling valid regulation (FB ≥ 87.5% of 0.8 V); requires external pull-up to ≤20 V. |
| FB | Feedback sense | Monitors output voltage via resistive divider; sets regulated output as VOUT = 0.8 × (1 + RTOP/RBOT). |
| NC | No-connect | Internal test pin; must be left floating or connected to GND - no electrical function in normal operation. |
| GND | Power ground | Primary return path for input, output, and internal circuitry; must connect to low-impedance PCB ground plane. |
| SW | Switch node | Drives external inductor and catch diode; carries high dv/dt switching waveform - critical for layout and EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side MOSFET | 80–160 mΩ RDS(ON) - eliminates external switch, reduces BOM count, and simplifies layout for compact designs. |
| Automatic PFM/PWM mode | Seamless transition below pulse-skip threshold - maintains >85% efficiency at 10 mA load while minimizing light-load quiescent current. |
| Internal soft start | Fixed 2048-clock-cycle ramp - limits inrush current during power-up and prevents output overshoot into pre-biased rails. |
| Integrated bootstrap diode | Eliminates need for external bootstrap diode - reduces component count and improves reliability in space-constrained layouts. |
| Current-mode control | Enables fast line/load transient response (<10 µs recovery) and inherent cycle-by-cycle current limiting for robust short-circuit protection. |
Applications
| Industrial Instrumentation | Communications Equipment |
|---|---|
Use Scenario: Powering ADCs, DACs, and sensor signal chains in portable test equipment with battery or wide-range DC input. IC Role / Device Role / Timing Role: Primary step-down regulator converting 12 V or 24 V system rail to 3.3 V or 2.5 V analog domain supply. Use Value: ±1.5% output accuracy and low noise ensure measurement integrity; 700 kHz switching avoids interference with sensitive analog bandwidths. | Use Scenario: Generating 5 V or 3.3 V supply for Ethernet PHYs, SFP modules, and baseband processors in access points and routers. IC Role / Device Role / Timing Role: Intermediate rail converter between front-end 12 V/48 V PoE-derived input and low-voltage digital ICs. Use Value: 3 A capability supports burst-mode traffic loads; power-good output enables safe reset sequencing of MAC and PHY subsystems. |
| Healthcare Monitoring | Consumer Electronics |
Use Scenario: Providing regulated 1.8 V or 0.8 V supply to low-power microcontrollers and biosensor interfaces in wearable ECG/SpO₂ devices. IC Role / Device Role / Timing Role: Adjustable-output buck regulator powering ultra-low-power SoCs from single-cell Li-ion (3.0–4.2 V) or USB input. Use Value: Pulse-skip mode extends battery life by maintaining >90% efficiency at µA–mA loads; EN pin hysteresis ensures clean startup under weak battery conditions. | Use Scenario: Converting 12 V wall adapter or USB PD input to 5 V/3.3 V for smart home hubs, audio codecs, and display controllers. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator replacing linear regulators to reduce heat and improve thermal management. Use Value: Integrated MOSFET and compensation eliminate 5+ external components; SOIC-8 EPAD enables cost-effective 2-layer PCB implementation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonsynchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678SD-3.3/NOPB | Fixed 3.3 V output, 5 A rating, 260 kHz switching, no integrated bootstrap diode, larger SO-8 package. | Suitable for higher-current, lower-frequency designs where size is less constrained and external diode acceptable. | Select when fixed 3.3 V output suffices and higher peak current (5 A) is required over wider temperature range (−40°C to +125°C). |
| TPS54332DR | 3 A, 28 V input, 1 MHz switching, integrated high-side FET, but requires external bootstrap capacitor and lacks PGOOD pin. | Fits designs needing higher input voltage margin and faster transient response, but adds layout complexity and removes power sequencing capability. | Choose when 1 MHz operation is mandatory for smaller magnetics and no power-good signaling is needed for downstream sequencing. |
Compared with LM2678SD-3.3/NOPB and TPS54332DR, ADP2303ARDZ offers tighter output accuracy (±1.5% vs. ±2%), integrated bootstrap diode (reducing component count), and dedicated PGOOD output - making it optimal for space-constrained, sequenced multi-rail systems requiring precision and simplicity.
Availability
ADP2303ARDZ is available at Aetrix Electronics and suitable for industrial instrumentation, communications infrastructure, and healthcare monitoring applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADP2303ARDZ 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The ADP230x series was designed specifically for compact, high-efficiency nonsynchronous buck conversion in space- and thermal-constrained applications - emphasizing integration, ease of use, and robust protection.
FAQ
What is the maximum continuous output current supported by the ADP2303ARDZ?
The ADP2303ARDZ supports up to 3 A continuous output current under specified thermal conditions (θJA = 58.5°C/W on JEDEC 4-layer board). This rating assumes proper PCB layout with the exposed paddle soldered to a thermal ground plane and ambient temperature ≤85°C. Peak current limit is 4.6–6.4 A depending on BST–SW voltage, but sustained operation above 3 A risks thermal shutdown.
Does the ADP2303ARDZ require an external catch diode, and what are its key requirements?
Yes, the ADP2303ARDZ requires an external Schottky catch diode connected from SW to GND. Key requirements include: average current rating ≥2.1 A (for 3 A output at 3.3 V/12 V), reverse voltage rating >20 V, low forward voltage (<0.5 V), and fast recovery (<50 ns). Recommended types include MBR0530 or SS34 - selected to minimize conduction loss and maintain efficiency above 90% at full load.
How does the ADP2303ARDZ handle light-load efficiency, and what is the mechanism?
The ADP2303ARDZ automatically transitions from fixed-frequency PWM mode to pulse-skip (PFM) mode below a load-dependent threshold. In pulse-skip mode, the regulator stops switching for several cycles, allowing the output capacitor to supply load current - reducing switching losses and maintaining >85% efficiency at 10 mA. Output ripple increases slightly in this mode, but regulation remains within ±3% of nominal.
Can the ADP2303ARDZ be used with a pre-biased output, and what precautions apply?
Yes, the ADP2303ARDZ supports pre-biased start-up, but requires careful attention to the bootstrap circuit. When VIN rises slowly into a pre-biased output, the internal bootstrap capacitor may not charge fully. To ensure reliable startup, use the precision EN pin with hysteresis to delay enable until VIN exceeds 2.7 V, and verify that VIN − VOUT > 2.1 V during startup - otherwise, add a small-signal Schottky diode for external bootstrap bias.
What is the purpose of the NC pin on the ADP2303ARDZ, and how should it be handled?
The NC (No Connect) pin on the ADP2303ARDZ is reserved for internal factory testing and has no functional role in normal operation. Per the datasheet, it must be left floating or connected to GND - neither configuration affects performance. Connecting it to any other voltage or leaving it unconnected on a non-grounded PCB layer poses no risk, but grounding simplifies layout and avoids potential ESD coupling paths.
ADP2303ARDZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 3A
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
ADP2303ARDZ FAQ
1.How can I place an order for ADP2303ARDZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP2303ARDZ 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 ADP2303ARDZ reliable?
The price and inventory of ADP2303ARDZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP2303ARDZ is usually 5 days.
3.What payment methods are accepted for ADP2303ARDZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP2303ARDZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP2303ARDZ?
ADP2303ARDZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP2303ARDZ 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 ADP2303ARDZ?
For technical support, including ADP2303ARDZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP2303ARDZ requirements.
6.How does Aetrix verify that ADP2303ARDZ is sourced from the original manufacturer or authorized distributors?
All ADP2303ARDZ 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 ADP2303ARDZ meets industry standards.
7.What is the process for return or replacement of ADP2303ARDZ?
All ADP2303ARDZ units undergo pre-shipment inspection (PSI). If there is an issue with ADP2303ARDZ, 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 ADP2303ARDZ part is unused and in its original packaging.
Return procedure for ADP2303ARDZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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