Analog Devices Inc. ADP5043ACPZ-1-R7

Overview

ADP5043ACPZ-1-R7 from Analog Devices is a micro power management unit integrating an 800 mA buck regulator, a 300 mA low-dropout (LDO) regulator, supervisory circuitry including dual watchdog timers, manual reset input, and open-drain reset output. It operates from 2.3 V to 5.5 V input, delivers ±1% initial output accuracy, and supports forced PWM or auto PFM/PSM modes for optimized efficiency in portable and battery-powered systems.

For engineers reviewing the ADP5043ACPZ-1-R7 datasheet, ADP5043ACPZ-1-R7 pinout, ADP5043ACPZ-1-R7 application, or ADP5043ACPZ-1-R7 equivalent, this device is selected for compact, high-integration PMU designs requiring coordinated voltage regulation, system supervision, and robust fault recovery in space-constrained embedded applications.

Technical Context

The ADP5043ACPZ-1-R7 implements a current-mode buck regulator operating at 3 MHz with selectable PWM/PSM mode via the MODE pin, enabling excellent transient response and compatibility with small multilayer inductors. Its LDO section maintains >60 dB PSRR up to 10 kHz and achieves 150 mV dropout at 300 mA load while stable with only 1 μF ceramic output capacitors.

Supervisory functions include two independent watchdogs: WD1 triggers reset only, while WD2 can initiate both reset and full regulators power cycle. The reset threshold exhibits ±1.5% accuracy over −40°C to +125°C, and nRSTO remains valid down to VCC = 1 V, ensuring reliable boot sequencing and runtime integrity monitoring in microprocessor-based systems.

Key Specifications

Pinout & Package

The ADP5043ACPZ-1-R7 is housed in a 20-lead, 4 mm × 4 mm LFCSP package with exposed pad (EPAD) that must be connected to AGND for thermal and electrical performance. Pin pitch is 0.5 mm; package complies with JEDEC J-STD-020 soldering standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power management unit applications.

Compared with TPS65023RSBR and MAX8646ETE+, the ADP5043ACPZ-1-R7 uniquely integrates buck+LDO regulation with dual watchdogs and manual reset in one 4 mm × 4 mm package - eliminating need for external supervisors and simplifying safety-critical firmware recovery design.

Availability

ADP5043ACPZ-1-R7 is available at Aetrix Electronics and suitable for portable medical devices, industrial IoT edge nodes, automotive body control modules, and smart energy meters requiring stable component supply, long-term lifecycle support, and guaranteed factory-programmed configurations.

Supply support for ADP5043ACPZ-1-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.

The ADP5043ACPZ-1-R7 belongs to Analog Devices' micro PMU product line, engineered for space-constrained, battery-sensitive applications where integrated regulation, supervision, and fault recovery must coexist without compromising efficiency or reliability.

FAQ

What are the factory-programmable options available for the ADP5043ACPZ-1-R7?

The ADP5043ACPZ-1-R7 offers factory-configurable reset threshold options (A: 2.25 V / 1.95 V UVLO; B: 3.9 V / 3.1 V UVLO), watchdog timeout selections (WD1: 81.6 ms or 1.6 sec; WD2: 6 sec to 102.4 min), and default output voltages for both buck and LDO rails. These settings are laser-trimmed at wafer level and cannot be modified in-system. ADP5043ACPZ-1-R7 datasheet Table 1 and Table 2 list all supported combinations.

How does the MODE pin affect efficiency and transient response in the ADP5043ACPZ-1-R7?

When MODE is high, the ADP5043ACPZ-1-R7 buck operates in forced PWM mode - delivering consistent 3 MHz switching and optimal transient response but higher light-load quiescent current. When MODE is low, it enters auto PFM/PSM mode, reducing switching frequency under light loads to cut quiescent current below 35 µA while maintaining regulation. ADP5043ACPZ-1-R7 Figure 10–13 validate this trade-off across input voltages and temperatures.

Can the ADP5043ACPZ-1-R7's LDO operate with input voltage below its output voltage?

No. The ADP5043ACPZ-1-R7 LDO requires VIN2 ≥ (VOUT2 + 0.2 V) for proper regulation, as specified in Table 4. Its dropout voltage is 150 mV at 300 mA, meaning minimum input is VOUT2 + 0.15 V under full load - but the 0.2 V margin ensures stability across process, voltage, and temperature variations. Attempting operation below this violates absolute maximum ratings and risks regulation loss.

What is the purpose of the separate AVIN, VIN1, and VIN2 supplies in the ADP5043ACPZ-1-R7?

AVIN powers only the supervisory block (reset generator, watchdogs, comparators), enabling accurate threshold monitoring even if buck or LDO inputs drop out. VIN1 powers the buck regulator and associated gate drivers; VIN2 powers the LDO. This separation allows independent sequencing - e.g., AVIN can be derived from a backup rail to maintain supervision during main supply faults. ADP5043ACPZ-1-R7 Figure 1 shows this partitioned architecture explicitly.

Does the ADP5043ACPZ-1-R7 support power sequencing between its buck and LDO outputs?

Yes. The ADP5043ACPZ-1-R7 provides independent enable pins (EN1 and EN2) and internal sequencing delay (tD1/tD2 = 2 ms) between regulator turn-on. By controlling EN1 and EN2 with external logic or MCU GPIOs, designers can enforce strict power-up order - for example, enabling the LDO before the buck to power bias circuits first. The datasheet specifies that regulators do not activate until their respective EN pin is asserted high.