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Analog Devices Inc. ADP2504ACPZ-3.5-R7
- Part No.:
- ADP2504ACPZ-3.5-R7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-VFDFN Exposed Pad, CSP
- Datasheet:
-
ADP2504ACPZ-3.5-R7.pdf
- Description:
- IC REG BUCK BST 3.5V 1A 10LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,383
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Product details
Overview
ADP2504ACPZ-3.5-R7 from Analog Devices is a 1 A, 2.5 MHz synchronous buck-boost DC-to-DC converter in a 3 mm × 3 mm LFCSP package, delivering fixed 3.5 V output from 2.3 V–5.5 V input. It features seamless buck/boost/buck-boost mode transition, 38 µA quiescent current, and integrated power switches for compact portable power rails in battery-powered systems.
For engineers reviewing the ADP2504ACPZ-3.5-R7 datasheet, ADP2504ACPZ-3.5-R7 pinout, ADP2504ACPZ-3.5-R7 application, or ADP2504ACPZ-3.5-R7 equivalent, key selection criteria include fixed 3.5 V output, 1 A load capability, 2.5 MHz switching frequency enabling 1.5 µH inductors, PSM/fixed-PWM/SYNC modes, and thermal/short-circuit/UVLO protection.
Technical Context
The ADP2504ACPZ-3.5-R7 implements synchronous average current-mode control with internal N- and P-channel MOSFETs (150 mΩ each), supporting buck, boost, and buck-boost topologies based on VIN vs. VOUT relationship. Its 2.5 MHz oscillator enables fast transient response and small passive components.
It operates across −40°C to +125°C junction temperature, uses internal compensation, and integrates soft start (200 µs ramp), load disconnect in boost mode, and three SYNC pin modes: PSM (light-load efficiency), forced PWM (low-noise), and external clock synchronization (2.2–2.8 MHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1000 mA maximum - supports high-current loads like USB peripherals or camera modules without external current boosting. |
| Switching Frequency | 2.5 MHz typical - enables use of 1.5 µH inductors and reduces output voltage ripple and solution footprint. |
| Input Voltage Range | 2.3 V to 5.5 V - compatible with single Li+/LiPo cells, dual alkaline/NiMH, USB 5 V, and PCMCIA supplies. |
| Fixed Output Voltage | 3.5 V ±2% - precision-regulated rail for 3.3 V–3.6 V logic, RF front-ends, or analog sensors requiring stable mid-rail bias. |
| Quiescent Current | 38 µA typical - extends battery life in always-on or low-duty-cycle portable devices such as wearables. |
| Protection Features | Overtemperature (150°C shutdown), short-circuit, reverse current limit (1.1 A), and undervoltage lockout (2.20 V rising threshold) - ensures robust operation under fault conditions. |
| Package | 10-lead 3 mm × 3 mm LFCSP (QFN) with exposed pad - provides low thermal resistance (θJA = 84°C/W) and space-efficient PCB integration. |
Pinout & Package
ADP2504ACPZ-3.5-R7 is housed in a 10-lead, 3 mm × 3 mm lead frame chip scale package (LFCSP/QFN) with an exposed thermal pad connected to PGND. The package supports high-density layouts and efficient heat dissipation via the exposed pad soldered to a PGND plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output node | Delivers fixed 3.5 V; requires low-ESR ceramic capacitor (≥22 µF) between VOUT and PGND for stability and transient response. |
| SW2 (Pin 2) | Buck-boost switch node 2 | Connects to inductor; carries high di/dt current in boost and buck-boost modes - must be routed with short, wide copper trace. |
| PGND (Pin 3) | Power ground return | Common return for input/output capacitors and exposed pad; must be tied to solid PGND plane to minimize noise and improve thermal performance. |
| SW1 (Pin 4) | Buck-boost switch node 1 | Connects to same inductor as SW2; active in buck and buck-boost modes - shared inductor simplifies layout and reduces BOM count. |
| PVIN (Pin 5) | Power input supply | High-current input path for internal switches; requires 10 µF X5R/X7R ceramic capacitor placed adjacent to pin for low-impedance decoupling. |
| EN (Pin 6) | Enable control input | Logic-high (>1.2 V) enables regulation with soft start; logic-low (<0.4 V) disables device, reducing input current to <1 µA. |
| SYNC (Pin 7) | Mode control and clock sync | Low = PSM mode; high = forced PWM; AC signal (2.2–2.8 MHz) = external synchronization - eliminates beat frequencies in multi-rail systems. |
| VIN (Pin 8) | Analog supply input | Provides bias for internal circuitry; must be decoupled separately from PVIN to avoid noise coupling into control loop. |
| AGND (Pin 9) | Analog ground reference | Reference for feedback amplifier and error comparator; should be connected to PGND at single point near IC to prevent ground bounce. |
| FB (Pin 10) | Feedback input | Internally connected to VOUT for fixed-output variants; not user-accessible on ADP2504ACPZ-3.5-R7 - eliminates external resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck/boost/buck-boost transition | Maintains regulation across input voltages both above and below 3.5 V without output glitch or mode-switching delay - critical for battery discharge curves. |
| Load disconnect in boost configuration | Isolates output from input during shutdown or fault, preventing backfeed and enabling true system-level power gating. |
| Three SYNC pin operating modes | Enables design flexibility: PSM for max battery life, forced PWM for EMI-sensitive applications, and external sync for timing-critical multi-converter systems. |
| Internal compensation | Eliminates need for external compensation network - reduces component count, board area, and design iteration time. |
| Soft start (200 µs) | Limits inrush current to <600 mA with 20 µF output capacitor - prevents input rail collapse and protects upstream power sources. |
Applications
| Wireless Handsets | Digital Cameras |
|---|---|
Use Scenario: Powering baseband processor I/O, RF transceiver bias, and display interface in compact smartphones with single-cell Li+ battery. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining stable 3.5 V rail as battery discharges from 4.2 V to 2.8 V. Use Value: Eliminates need for separate buck and boost converters, reducing solution size by >30% and enabling continuous operation across full battery range. | Use Scenario: Supplying image sensor analog core, autofocus motor driver, and LCD backlight controller in portable digital cameras. IC Role / Device Role / Timing Role: High-efficiency 3.5 V power source with fast load transient response to handle burst-mode sensor readout and flash charging. Use Value: 2.5 MHz switching minimizes inductor size while sustaining >90% efficiency at 500 mA - critical for thermal management in sealed enclosures. |
| USB-Powered Devices | Miniature Hard Disk Drives |
Use Scenario: Regulating 5 V USB input down to 3.5 V for microcontroller, memory, and peripheral interfaces in portable SSDs or dongles. IC Role / Device Role / Timing Role: Buck-mode operation with 38 µA quiescent current preserving host battery during standby. Use Value: Ultra-low IQ extends USB host battery life during idle periods without sacrificing wake-up responsiveness. | Use Scenario: Providing regulated 3.5 V spindle motor drive and servo control voltage in 1.8-inch HDDs powered from 5 V USB or 3.3 V system rail. IC Role / Device Role / Timing Role: Boost-mode operation when input drops below 3.5 V during spin-up surges or brownout events. Use Value: Seamless mode transition prevents motor stall or data corruption during dynamic load changes - verified in HDD qualification testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | 2.5 V–6.0 V input, adjustable output (0.9 V–6.0 V), 3 A peak current, 2.4 MHz switching - higher current but no fixed 3.5 V option. | Requires external resistor divider for 3.5 V; larger 8-pin VSON package (3.0 mm × 2.0 mm) with different pinout. | Choose when adjustable output or higher current headroom is needed; redesign required for FB routing and layout. |
| MAX77827BEWC+T | 2.5 V–5.5 V input, fixed 3.3 V output only, 1.2 A, 2.0 MHz - lacks 3.5 V option and has lower switching frequency. | Optimized for wearables with ultra-low IQ (18 µA), but 0.2 V output mismatch requires level-shifting for 3.5 V–tolerant loads. | Choose for ultra-low-power wearables where 3.3 V is acceptable; not drop-in for 3.5 V–specific circuits. |
Compared with TPS63020DSJR and MAX77827BEWC+T, ADP2504ACPZ-3.5-R7 offers exact 3.5 V regulation without external components, identical 2.5 MHz frequency for consistent EMI filtering, and guaranteed 1 A delivery at full temperature range - simplifying qualification for industrial and medical portable equipment.
Availability
ADP2504ACPZ-3.5-R7 is available at Aetrix Electronics and suitable for wireless handsets, digital cameras, and USB-powered devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADP2504ACPZ-3.5-R7 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and consumer markets since 1965.
The ADP2504ACPZ-3.5-R7 belongs to Analog Devices' ADP2503/ADP2504 buck-boost converter family, designed specifically for space-constrained, battery-operated portable electronics needing wide-input, fixed-output regulation with minimal external components.
FAQ
What is the output voltage tolerance of the ADP2504ACPZ-3.5-R7?
The ADP2504ACPZ-3.5-R7 delivers a fixed 3.5 V output with initial accuracy of ±2% over temperature and line/load conditions. This specification is guaranteed per the datasheet's "Output Voltage Initial Accuracy" parameter under PWM operation with no load, ensuring reliable biasing for 3.3 V–3.6 V logic families and analog subsystems without post-regulation trimming.
Does the ADP2504ACPZ-3.5-R7 require external feedback resistors?
No, the ADP2504ACPZ-3.5-R7 does not require external feedback resistors. As a fixed-output variant, its FB pin is internally connected to VOUT. Unlike the adjustable ADP2504ACPZ-R7, this part eliminates the need for an external resistor divider, reducing BOM count, PCB area, and potential drift errors from resistor tolerances or temperature coefficients.
How does the ADP2504ACPZ-3.5-R7 handle input voltage transitions across the 3.5 V threshold?
The ADP2504ACPZ-3.5-R7 automatically transitions between buck, boost, and buck-boost modes without interruption. When VIN > 3.5 V, it operates in buck mode; when VIN < 3.5 V, it switches to boost mode; and within ±10% (3.15 V–3.85 V), it enters buck-boost mode using interleaved switching. This seamless transition maintains regulation with <1% output deviation and no observable glitch on VOUT.
What thermal performance can be expected from the ADP2504ACPZ-3.5-R7 in a standard 4-layer PCB?
On a standard 4-layer PCB per JEDEC JESD 51-9 (4″ × 3″), the ADP2504ACPZ-3.5-R7 has a junction-to-ambient thermal resistance (θJA) of 84°C/W. At 1 A output with 3.6 V input and 3.5 V output (≈85% efficiency), power dissipation is ~0.21 W, resulting in a junction-to-ambient rise of ~17.6°C - well within the −40°C to +125°C operating range even at 105°C ambient.
Can the ADP2504ACPZ-3.5-R7 be synchronized to an external clock?
Yes, the ADP2504ACPZ-3.5-R7 supports external clock synchronization via its SYNC pin. Applying a clean square wave between 2.2 MHz and 2.8 MHz (with minimum on/off times ≥160 ns) locks the internal oscillator to the external frequency. This feature eliminates beat frequencies in multi-converter systems and simplifies EMI filter design by fixing the fundamental switching harmonic.
ADP2504ACPZ-3.5-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-LFCSP-WD (3x3)
ADP2504ACPZ-3.5-R7 FAQ
1.How can I place an order for ADP2504ACPZ-3.5-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP2504ACPZ-3.5-R7 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 ADP2504ACPZ-3.5-R7 reliable?
The price and inventory of ADP2504ACPZ-3.5-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP2504ACPZ-3.5-R7 is usually 5 days.
3.What payment methods are accepted for ADP2504ACPZ-3.5-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP2504ACPZ-3.5-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP2504ACPZ-3.5-R7?
ADP2504ACPZ-3.5-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP2504ACPZ-3.5-R7 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 ADP2504ACPZ-3.5-R7?
For technical support, including ADP2504ACPZ-3.5-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP2504ACPZ-3.5-R7 requirements.
6.How does Aetrix verify that ADP2504ACPZ-3.5-R7 is sourced from the original manufacturer or authorized distributors?
All ADP2504ACPZ-3.5-R7 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 ADP2504ACPZ-3.5-R7 meets industry standards.
7.What is the process for return or replacement of ADP2504ACPZ-3.5-R7?
All ADP2504ACPZ-3.5-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP2504ACPZ-3.5-R7, 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 ADP2504ACPZ-3.5-R7 part is unused and in its original packaging.
Return procedure for ADP2504ACPZ-3.5-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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