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Analog Devices Inc. ADP2503ACPZ-3.5-R7
- Part No.:
- ADP2503ACPZ-3.5-R7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-VFDFN Exposed Pad, CSP
- Datasheet:
-
ADP2503ACPZ-3.5-R7.pdf
- Description:
- IC REG BUCK BOOST 3.5V 10LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,410
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Product details
Overview
ADP2503ACPZ-3.5-R7 from Analog Devices is a 600 mA, 2.5 MHz synchronous buck-boost DC-to-DC converter in a 3 mm × 3 mm LFCSP package, supporting input voltages from 2.3 V to 5.5 V and delivering a fixed 3.5 V output. It features seamless mode transition, 38 µA quiescent current, internal compensation, and load disconnect-enabling compact, battery-efficient power for portable USB-powered devices.
For engineers reviewing the ADP2503ACPZ-3.5-R7 datasheet, ADP2503ACPZ-3.5-R7 pinout, ADP2503ACPZ-3.5-R7 application, or ADP2503ACPZ-3.5-R7 equivalent, key selection criteria include its fixed 3.5 V output, 600 mA capability, 2.5 MHz switching frequency enabling 1.5 µH inductors, PSM/fixed-PWM/SYNC modes, and thermal/short-circuit/UVLO protections.
Technical Context
The ADP2503ACPZ-3.5-R7 operates in buck, boost, or buck-boost mode depending on VIN relative to VOUT (±10% range), using average current-mode control with internal N- and P-channel switches (150 mΩ RDS(on)). Its 2.5 MHz oscillator enables fast transient response and minimal inductor size, while the SYNC pin supports three operational modes: PSM for light-load efficiency, forced PWM for EMI-sensitive applications, and external clock synchronization.
It integrates soft start (200 µs ramp), undervoltage lockout (2.20 V rising threshold), overtemperature shutdown (150°C), and reverse current limiting (1.1 A). The device maintains regulation across single Li+/LiPo, multi-cell alkaline/NiMH, USB, or PCMCIA sources, with true load disconnect during shutdown (<1 µA IQ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 600 mA maximum continuous - sufficient for core logic, RF transceivers, and sensor subsystems in space-constrained portable designs. |
| Switching Frequency | 2.5 MHz typical - enables use of small 1.5 µH inductors and reduces output voltage ripple without increasing EMI filtering complexity. |
| Input Voltage Range | 2.3 V to 5.5 V - compatible with single-cell Li+/LiPo (2.7–4.2 V), two alkaline/NiMH (2.4–3.6 V), and USB 5 V sources. |
| Fixed Output Voltage | 3.5 V ±2% initial accuracy - eliminates need for external feedback resistors and simplifies BOM for systems requiring stable 3.5 V rail. |
| Quiescent Current | 38 µA typical - extends battery life in always-on or low-duty-cycle applications such as wearables and remote sensors. |
| Package | 10-lead 3 mm × 3 mm LFCSP (CP-10-9) with exposed pad - provides low thermal resistance (θJA = 84°C/W) and high power density for thermally demanding layouts. |
| Protection Features | UVLO, thermal shutdown (150°C), short-circuit, and reverse current limit - ensures robust operation under fault conditions without external circuitry. |
Pinout & Package
ADP2503ACPZ-3.5-R7 is housed in a 10-lead, 3 mm × 3 mm LFCSP (Lead Frame Chip Scale Package) with exposed thermal pad (EP), optimized for low-profile, high-efficiency PCB layouts. The package supports reflow soldering per JEDEC J-STD-020 and offers 84°C/W junction-to-ambient thermal resistance on a standard 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output node | Delivers fixed 3.5 V; connects directly to output capacitor and load; must be decoupled with ≥22 µF ceramic capacitance. |
| SW2 (Pin 2) | Boost-side switch node | Internal connection to PMOS2/NMOS2; ties to inductor's "input" side in boost/buck-boost modes; requires short, wide trace to minimize ringing. |
| PGND (Pin 3) | Power ground return | Low-impedance return path for input/output capacitors and power switches; must connect to solid PGND plane with multiple vias to EP. |
| SW1 (Pin 4) | Buck-side switch node | Internal connection to PMOS1/NMOS1; ties to inductor's "output" side in buck/buck-boost modes; shares same inductor as SW2. |
| PVIN (Pin 5) | Main power input | Supplies buck-boost power switches; requires local 10 µF ceramic capacitor between PVIN and PGND for high-frequency noise suppression. |
| EN (Pin 6) | Enable control input | Active-high logic input; drives high to enable regulation with soft-start; pulls low to enter shutdown (<1 µA IQ). |
| SYNC (Pin 7) | Mode selection & synchronization | Three-state control: low = PSM/PWM auto-switch; high = forced fixed-frequency PWM; AC signal (2.2–2.8 MHz) = external sync. |
| VIN (Pin 8) | Analog supply input | Provides bias for internal control circuitry; must be decoupled separately from PVIN to avoid noise coupling into error amplifier. |
| AGND (Pin 9) | Analog ground reference | Reference for FB, EN, SYNC, and internal analog blocks; should be connected to PGND at single point near IC or via dedicated AGND plane. |
| FB (Pin 10) | Feedback input | Internally tied to VOUT for fixed-output variants like ADP2503ACPZ-3.5-R7; not user-accessible for voltage setting. |
| EP (Exposed Pad) | Thermal & electrical ground | Must be soldered to PGND plane for thermal dissipation and low-inductance grounding; critical for stability and thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck/boost/buck-boost mode transition | Maintains regulation across VIN = VOUT ±10% without output disturbance-ideal for battery-powered systems where input voltage drifts across discharge curve. |
| Load disconnect in boost configuration | Isolates output from input during shutdown, preventing backfeed and enabling true system-level power gating for energy harvesting or dual-rail architectures. |
| 38 µA quiescent current in PSM | Extends runtime in standby or sensor-monitoring states-e.g., a 200 mAh coin cell powers ADP2503ACPZ-3.5-R7 for >200 days at 10 µA average load. |
| Internal compensation network | Eliminates external compensation components, reducing solution size and design iteration time while ensuring stability with recommended 1.5 µH inductor and 22 µF output cap. |
| Soft start (200 µs) | Limits inrush current to <600 mA with 20 µF output capacitor-prevents brownout of upstream supplies and avoids overstressing input capacitors during cold boot. |
Applications
| Wireless Handsets | Digital Cameras |
|---|---|
|
Use Scenario: Powering baseband processor and RF front-end from single Li+ cell with varying voltage (4.2 V → 3.0 V). IC Role / Device Role / Timing Role: Buck-boost regulator maintaining stable 3.5 V rail regardless of battery state, enabling uninterrupted modem operation and antenna tuning. Use Value: Eliminates need for separate buck and boost stages, reducing component count by 30% and PCB area by 25% versus discrete solutions. |
Use Scenario: Supplying image sensor and flash LED driver from USB 5 V or AA batteries. IC Role / Device Role / Timing Role: Efficiently steps down 5 V or steps up 3 V to deliver regulated 3.5 V for CMOS sensor bias and analog front-end circuits. Use Value: Achieves >90% peak efficiency across 10 mA–500 mA load range, extending capture duration per charge and minimizing thermal rise in compact enclosures. |
| USB-Powered Peripherals | Miniature Hard Disk Drives |
|
Use Scenario: Providing clean 3.5 V to microcontroller and USB interface IC in bus-powered dongles or adapters. IC Role / Device Role / Timing Role: Regulating from noisy 5 V USB source while rejecting conducted EMI via high-frequency switching and integrated filtering. Use Value: Enables full-speed USB 2.0 compliance without external LC filters, reducing BOM cost and improving signal integrity on data lines. |
Use Scenario: Generating 3.5 V for spindle motor controller and read/write channel IC in 1.8-inch HDDs powered by 5 V or 3.3 V rails. IC Role / Device Role / Timing Role: Delivering tightly regulated, low-noise 3.5 V with fast transient response to handle motor startup surges and servo loop demands. Use Value: Reduces output voltage deviation to <±15 mV during 100 mA load steps, preventing servo misalignment and improving bit-error rate. |
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 | 600 mA, 2.5 MHz, 2.5–5.5 V input, adjustable/fixed outputs (3.3/3.6/5.0 V); no load disconnect; higher 75 µA IQ. | Lacks true load disconnect and has lower light-load efficiency; suitable only when output isolation during shutdown is not required. | Select TPS63020DSJR if footprint compatibility and TI ecosystem support outweigh need for load disconnect and ultra-low IQ. |
| MAX77827BEWC+T | 600 mA, 2.2 MHz, 2.5–5.5 V input, fixed 3.3 V output; includes I2C programmability and dynamic voltage scaling. | Offers digital control but lacks PSM mode and has larger 4 mm × 4 mm WLP package; fixed 3.3 V vs. ADP2503ACPZ-3.5-R7's 3.5 V. | Choose MAX77827BEWC+T only when firmware-controlled voltage adjustment or telemetry is mandatory-and 3.3 V suffices. |
Compared with TPS63020DSJR and MAX77827BEWC+T, ADP2503ACPZ-3.5-R7 uniquely delivers fixed 3.5 V output with load disconnect, 38 µA quiescent current, and seamless mode transition-making it optimal for battery-powered systems requiring precise voltage, zero-backfeed, and longest runtime.
Availability
ADP2503ACPZ-3.5-R7 is available at Aetrix Electronics and suitable for wireless handsets, USB-powered peripherals, and miniature hard disk power supplies requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for ADP2503ACPZ-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 ADP2503/ADP2504 product line was designed specifically for space-constrained, battery-operated portable electronics requiring high-efficiency, low-quiescent-current buck-boost regulation with minimal external components and robust protection.
FAQ
What is the output voltage tolerance of ADP2503ACPZ-3.5-R7 under full load and temperature extremes?
The ADP2503ACPZ-3.5-R7 guarantees ±2% initial output voltage accuracy at no load and 25°C. Over −40°C to +125°C junction temperature and 0–600 mA load, total output variation-including line, load, and temperature effects-is typically within ±3.5%, as confirmed by load regulation (≤0.5%) and line regulation (≤0.6%) specs in the datasheet.
Does ADP2503ACPZ-3.5-R7 support external synchronization, and what frequency range is acceptable?
Yes, ADP2503ACPZ-3.5-R7 supports external synchronization via the SYNC pin. When driven with an AC signal, it locks to frequencies between 2.2 MHz and 2.8 MHz. The signal must maintain minimum on/off times of 160 ns, and the internal oscillator resumes operation if SYNC stops toggling.
Can ADP2503ACPZ-3.5-R7 operate with input voltages below 2.3 V, and what happens at the UVLO threshold?
No-ADP2503ACPZ-3.5-R7 is not specified to operate below 2.3 V input. Its undervoltage lockout activates at 2.20 V (rising threshold), disabling switching until VIN exceeds that level. If VIN drops below 2.10 V during operation, the device shuts down and remains off until VIN rises above 2.20 V again.
How does the load disconnect feature function in ADP2503ACPZ-3.5-R7, and when is it active?
In boost mode, ADP2503ACPZ-3.5-R7 achieves true load disconnect by turning off both PMOS1 and NMOS2 switches during shutdown (EN = low), isolating VOUT from PVIN. This prevents backfeed and leakage-critical for systems requiring zero standby current or safe hot-plug operation. Disconnect is inactive in buck mode.
What is the recommended inductor value for ADP2503ACPZ-3.5-R7, and why is 1.5 µH preferred?
Analog Devices recommends a 1.5 µH inductor for ADP2503ACPZ-3.5-R7. At 2.5 MHz, this value balances low current ripple, high efficiency (>90% at mid-load), and compact size. Larger values increase DCR and size; smaller ones risk instability and excessive ripple. The datasheet specifies 1.0–2.0 µH as stable range, with 1.5 µH optimized for ADP2503's 600 mA rating.
ADP2503ACPZ-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:
- Obsolete
- 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:
- 600mA
- 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)
ADP2503ACPZ-3.5-R7 FAQ
1.How can I place an order for ADP2503ACPZ-3.5-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP2503ACPZ-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 ADP2503ACPZ-3.5-R7 reliable?
The price and inventory of ADP2503ACPZ-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 ADP2503ACPZ-3.5-R7 is usually 5 days.
3.What payment methods are accepted for ADP2503ACPZ-3.5-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP2503ACPZ-3.5-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP2503ACPZ-3.5-R7?
ADP2503ACPZ-3.5-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP2503ACPZ-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 ADP2503ACPZ-3.5-R7?
For technical support, including ADP2503ACPZ-3.5-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP2503ACPZ-3.5-R7 requirements.
6.How does Aetrix verify that ADP2503ACPZ-3.5-R7 is sourced from the original manufacturer or authorized distributors?
All ADP2503ACPZ-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 ADP2503ACPZ-3.5-R7 meets industry standards.
7.What is the process for return or replacement of ADP2503ACPZ-3.5-R7?
All ADP2503ACPZ-3.5-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP2503ACPZ-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 ADP2503ACPZ-3.5-R7 part is unused and in its original packaging.
Return procedure for ADP2503ACPZ-3.5-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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