Analog Devices Inc. ADP2370ACPZ-3.3-R7

Overview

ADP2370ACPZ-3.3-R7 from Analog Devices is a fixed-output 3.3 V, 800 mA synchronous buck regulator with 3.2 V to 15 V input range, 1.2 MHz/600 kHz selectable switching frequency, and <14 µA quiescent current in power-saving mode. It features integrated high-side P-channel and low-side N-channel MOSFETs, 100% duty cycle capability, and power-good (PG) output for system monitoring in portable battery-powered systems.

For engineers reviewing the ADP2370ACPZ-3.3-R7 datasheet, ADP2370ACPZ-3.3-R7 pinout, ADP2370ACPZ-3.3-R7 application, or ADP2370ACPZ-3.3-R7 equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal performance in 3 mm × 3 mm LFCSP, real-world load/line regulation data, and two rigorously cross-checked alternative parts for design continuity.

Technical Context

The ADP2370ACPZ-3.3-R7 uses a proprietary high-speed current-mode PWM control architecture with internal compensation and soft-start, enabling stable operation with only three external components. Its synchronous rectification eliminates the need for an external Schottky diode, while the PSM/PWM dual-mode operation dynamically optimizes efficiency across load conditions.

Frequency selection is implemented via the FSEL pin (1.2 MHz high, 600 kHz low) or external synchronization (400–800 kHz or 0.8–1.6 MHz range), and the SYNC pin enables forced PWM mode for noise-sensitive applications. The device integrates undervoltage lockout (UVLO), thermal shutdown (150°C), short-circuit protection, and precision enable thresholds (1.10–1.26 V logic-high).

Key Specifications

Pinout & Package

ADP2370ACPZ-3.3-R7 is housed in an 8-lead, 3 mm × 3 mm × 0.75 mm lead frame chip scale package (LFCSP) with an electrically connected exposed pad (EPAD) that must be soldered to the PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck regulator applications.

Compared with TPS62840DRVR and MAX17504ATP+, the ADP2370ACPZ-3.3-R7 uniquely balances 3.2–15 V input flexibility, sub-14 µA PSM quiescent current, and fixed 3.3 V simplicity - making it optimal for dual-cell battery and universal adapter-powered portable electronics where layout space and battery life are co-constrained.

Availability

ADP2370ACPZ-3.3-R7 is available at Aetrix Electronics and suitable for portable medical sensors, smart metering nodes, handheld POS terminals, and industrial tablet displays requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for ADP2370ACPZ-3.3-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, headquartered in Norwood, MA, with engineering resources spanning signal conditioning, power management, and precision conversion.

The ADP2370ACPZ-3.3-R7 belongs to Analog Devices' high-efficiency, low-IQ buck regulator product line, designed specifically for battery-constrained portable and wireless sensing applications demanding minimal standby power and small solution footprint.

FAQ

What is the maximum input voltage rating for the ADP2370ACPZ-3.3-R7?

The ADP2370ACPZ-3.3-R7 has an absolute maximum input voltage rating of +17 V relative to PGND, but its recommended operating input voltage range is 3.2 V to 15 V. Operation above 15 V may compromise reliability and is not characterized per the datasheet. The device's internal UVLO ensures safe startup only above 3.19 V.

Does the ADP2370ACPZ-3.3-R7 require external feedback resistors?

No. The ADP2370ACPZ-3.3-R7 is a fixed-output variant with internal 3.3 V feedback reference; the FB pin is internally connected and must be left unconnected. This eliminates resistor tolerance errors, saves board space, and improves long-term output voltage stability compared to adjustable regulators.

How does the power-good (PG) output function on the ADP2370ACPZ-3.3-R7?

The PG pin is an open-drain output that pulls low when VOUT drops below 92% of nominal (3.04 V for ADP2370ACPZ-3.3-R7). It asserts after a 20 µs delay on rising VOUT and releases after a 0.5 µs delay on falling VOUT, providing precise rail monitoring for microcontroller reset sequencing or system-level fault detection.

Can the ADP2370ACPZ-3.3-R7 operate with 100% duty cycle, and what is its practical benefit?

Yes. The ADP2370ACPZ-3.3-R7 supports 100% duty cycle operation, allowing VOUT regulation even when VIN approaches VOUT (e.g., VIN = 3.4 V → VOUT = 3.3 V). This extends usable battery life in Li-ion or alkaline systems by delaying brownout shutdown until the cell reaches end-of-discharge voltage.

What thermal performance can be expected from the ADP2370ACPZ-3.3-R7 in a standard 4-layer PCB layout?

In a JEDEC-standard 4-layer board (4 in × 3 in), the ADP2370ACPZ-3.3-R7 exhibits θJA = 36.7°C/W. At 800 mA output and 7.2 V input, typical power dissipation is ~350 mW; thus junction temperature rise is ~12.9°C above ambient - well within the −40°C to +125°C operating range when ambient stays below +112°C.