Analog Devices Inc./Maxim Integrated MAX1952ESA

Overview

MAX1952ESA from Maxim Integrated is a fixed-output, 1.8V, 2A synchronous step-down DC-DC regulator operating at 1MHz with up to 94% efficiency. It accepts 2.6V–5.5V input, delivers ±1.5% output accuracy over load/line/temperature, and integrates PMOS/NMOS power switches in an 8-pin SO package for post-regulation of FPGA I/O or ASIC core supplies.

For engineers reviewing the MAX1952ESA datasheet, MAX1952ESA pinout, MAX1952ESA application, or MAX1952ESA equivalent, this page provides verified technical context, confirmed pin functions, real-world application constraints, and validated alternative options for 1.8V/2A point-of-load designs requiring compact all-ceramic solutions.

Technical Context

The MAX1952ESA uses current-mode PWM control with internal slope compensation and digital soft-start. Its transconductance error amplifier (26.7–53.3 µS) drives COMP to regulate via integrated 1.8V reference, while LX switching (0.8–1.1 MHz) is synchronized between high-side PMOS (266 mΩ max) and low-side NMOS (206 mΩ max) switches.

Protection includes thermal shutdown at +160°C (hysteresis: +145°C), short-circuit pulse-skipping mode, and dual current limits: +2.4–4.5A high-side and –0.6A low-side. The device relies on R_DS(ON)-based current sensing and requires external RC compensation on COMP for loop stability.

Key Specifications

Pinout & Package

MAX1952ESA is housed in an 8-pin SO (Small Outline) package with exposed pad not electrically connected. Thermal resistance θ_JA = 82°C/W on 4-layer JEDEC board.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output 1.8V/2A step-down regulator applications.

Compared with TPS62231DRYT and RT8059NGSP, the MAX1952ESA offers superior thermal protection behavior (15°C hysteresis), tighter output accuracy (±1.5%), and integrated digital soft-start-critical for reliable startup in multi-rail systems with sequencing constraints.

Availability

MAX1952ESA is available at Aetrix Electronics and suitable for FPGA I/O power, cellular base station RF modules, networking switch ASICs, and set-top box SoC applications requiring stable component supply across industrial temperature ranges.

Supply support for MAX1952ESA 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

Maxim Integrated (now part of Analog Devices) designs high-performance analog and mixed-signal ICs for power, interface, sensing, and timing applications.

The MAX1952ESA belongs to the MAX195x family of high-efficiency synchronous buck regulators targeting space-constrained, high-current point-of-load applications in communications and computing infrastructure.

FAQ

What is the guaranteed output voltage accuracy of the MAX1952ESA over temperature?

The MAX1952ESA guarantees 1.764V to 1.836V output (±1.5%) across the full –40°C to +85°C operating range, as confirmed in the Electrical Characteristics table under TA = –40°C to +85°C conditions. This accuracy is achieved using an internal precision resistor divider referenced to the 1.95–2.03V REF pin, eliminating external resistor tolerance errors. The MAX1952ESA maintains this specification without requiring calibration or trimming.

Can the MAX1952ESA operate with only ceramic capacitors on input and output?

Yes, the MAX1952ESA is explicitly designed for all-ceramic operation: the datasheet specifies 10µF ceramic input and 10µF ceramic output capacitors with a 2µH inductor for 1.5A output. Its current-mode control architecture and R_DS(ON) current sensing eliminate the need for electrolytic or tantalum capacitors. Ceramic capacitors reduce ESR-related losses and improve transient response-key for FPGA and ASIC loads. The MAX1952ESA's stability is verified with X5R/X7R dielectrics.

How does the MAX1952ESA enter and exit shutdown mode?

The MAX1952ESA enters shutdown when COMP is pulled below 0.17V (typical falling threshold); this forces LX into high-impedance state, shorts REF to GND, and stops switching. To exit shutdown, release COMP-either by removing the external pulldown or allowing internal startup circuits to raise COMP above 1.2V (rising threshold). Upon release, the MAX1952ESA initiates digital soft-start, ramping REF and FB voltages to prevent inrush current. No external enable pin is required-the COMP pin serves dual function.

What is the maximum allowable inductor value for stable operation of the MAX1952ESA?

The MAX1952ESA design procedure explicitly states "Do not use output inductors larger than 2.2µH." Larger values degrade transient response and risk instability due to reduced loop bandwidth and increased phase lag. The recommended 2µH inductor balances ripple current (20–40% of 2A max), size, and stability. Using >2.2µH violates the validated design window and may cause output overshoot or oscillation under load steps-verified in the Load-Transient Response graphs for the MAX1952ESA.

Does the MAX1952ESA require an external compensation network, and if so, what components are needed?

Yes, the MAX1952ESA requires an external RC network from COMP to GND for loop stability. A typical configuration uses a 51.1kΩ resistor and 220pF capacitor (per design example in datasheet Figure 2a), forming a pole-zero pair that compensates the current-mode control loop. This network sets closed-loop unity-gain frequency ≤200kHz (≤1/5 of 1MHz switching frequency) and ensures phase margin >45°. Omitting or mis-sizing these components causes oscillation or poor transient response-confirmed in the Compensation Design section of the MAX1952ESA datasheet.