Analog Devices Inc. ADP2504ACPZ-4.5-R7

Overview

ADP2504ACPZ-4.5-R7 from Analog Devices is a 1000 mA, 2.5 MHz synchronous buck-boost DC-DC converter in a 3 mm × 3 mm LFCSP package, delivering fixed 4.5 V output from 2.3 V–5.5 V input. It features 38 µA quiescent current, seamless buck/boost/buck-boost mode transition, and integrated power switches for compact portable power rails in USB-powered devices and wireless handsets.

For engineers reviewing the ADP2504ACPZ-4.5-R7 datasheet, ADP2504ACPZ-4.5-R7 pinout, ADP2504ACPZ-4.5-R7 application, or ADP2504ACPZ-4.5-R7 equivalent, key selection criteria include its 4.5 V fixed output, 1 A load capability, 2.5 MHz switching frequency enabling 1.5 µH inductors, PSM/fixed-PWM/SYNC modes, and thermal shutdown at 150°C.

Technical Context

The ADP2504ACPZ-4.5-R7 implements synchronous average current-mode control with internal N- and P-channel MOSFETs (150 mΩ each), supporting buck, boost, and buck-boost operation depending on VIN vs. VOUT relationship. Its seamless mode transition maintains regulation across input voltages both above and below 4.5 V while minimizing inductor current ripple.

It integrates soft start (200 µs ramp), undervoltage lockout (2.20 V rising threshold), overtemperature protection (150°C trip), short-circuit protection (1.3–2.0 A switch current limit), and reverse current limiting (1.1 A). The SYNC pin enables three operational modes: PSM (light-load efficiency), forced PWM (low-noise fixed frequency), or external clock synchronization (2.2–2.8 MHz).

Key Specifications

Pinout & Package

ADP2504ACPZ-4.5-R7 uses a 10-lead 3 mm × 3 mm LFCSP (QFN) package with exposed pad (EP) thermally connected to PGND. The compact footprint and 1 mm height support ultra-thin portable designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck-boost converter applications.

Compared with TPS63020DSJR and MAX77827BEWC+T, the ADP2504ACPZ-4.5-R7 offers plug-and-play 4.5 V regulation with zero external feedback components, guaranteed load disconnect, and minimal 3 mm × 3 mm footprint - making it optimal for space-constrained, battery-sensitive designs where fixed output suffices.

Availability

ADP2504ACPZ-4.5-R7 is available at Aetrix Electronics and suitable for wireless handsets, digital cameras, USB-powered peripherals, and miniature hard disk drives requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for ADP2504ACPZ-4.5-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-4.5-R7 belongs to Analog Devices' ADP2503/ADP2504 buck-boost converter family, engineered specifically for ultra-compact, high-efficiency power management in battery-powered portable electronics with stringent size and quiescent current constraints.

FAQ

What is the output voltage tolerance of the ADP2504ACPZ-4.5-R7 under full load and temperature range?

The ADP2504ACPZ-4.5-R7 guarantees ±2% initial output voltage accuracy at no load and 0.5% load regulation (VIN = 2.3 V to 3.6 V, ILOAD = 0–500 mA, forced PWM mode). Over −40°C to +125°C junction temperature, total output variation remains within ±3.5% including line, load, and temperature effects - verified per Analog Devices Rev. F datasheet Table 1.

Does the ADP2504ACPZ-4.5-R7 support external synchronization, and what frequency range is acceptable?

Yes, the ADP2504ACPZ-4.5-R7 supports external synchronization via the SYNC pin. When driven with an AC clock signal, it locks to frequencies between 2.2 MHz and 2.8 MHz, with minimum off-time of 160 ns. This allows precise EMI frequency placement in noise-sensitive systems like medical sensors or audio codecs without modifying the ADP2504ACPZ-4.5-R7's internal oscillator.

Can the ADP2504ACPZ-4.5-R7 operate with input voltage lower than its 4.5 V output?

Yes, the ADP2504ACPZ-4.5-R7 is a true buck-boost converter and operates seamlessly when VIN is below, equal to, or above 4.5 V - for example, delivering regulated 4.5 V from a discharged 3.6 V Li-ion cell. In boost mode, it maintains regulation down to VIN = 2.3 V with full 1 A capability, as confirmed in Figure 4 of the ADP2504 datasheet.

What protection features are integrated into the ADP2504ACPZ-4.5-R7?

The ADP2504ACPZ-4.5-R7 integrates overtemperature shutdown (150°C trip, 25°C hysteresis), short-circuit protection (1.3–2.0 A switch current limit), reverse current limiting (1.1 A), undervoltage lockout (2.20 V rising threshold), and soft-start (200 µs ramp). All protections are fully autonomous and require no external components - detailed in Sections 11–12 of the Rev. F datasheet.

Is the ADP2504ACPZ-4.5-R7 pin-compatible with other members of the ADP2503/ADP2504 family?

Yes, all ADP2503 and ADP2504 variants - including ADP2504ACPZ-4.5-R7, ADP2504ACPZ-3.3-R7, and ADP2503ACPZ-5.0-R7 - share identical 10-lead 3 mm × 3 mm LFCSP (CP-10-9) packaging and pinout. This enables drop-in replacement across output voltages and current ratings without PCB redesign, as confirmed in the Ordering Guide and Pin Configuration sections of the datasheet.