Analog Devices Inc./Maxim Integrated MAX77827DEWC+T

Overview

MAX77827DEWC+T from Maxim Integrated is a high-efficiency, ultra-low-quiescent-current buck-boost DC/DC regulator for single-cell Li-ion battery systems. It delivers 2.3V–5.3V adjustable output from 1.8V–5.5V input, supports 1.8A switching current limit (900mA boost mode at 3.0V_IN/3.3V_OUT), achieves 96% peak efficiency, and operates with 6μA typical I_Q. It enables compact power rail generation in space-constrained wearables and LPWAN modules.

For engineers reviewing the MAX77827DEWC+T datasheet, MAX77827DEWC+T pinout, MAX77827DEWC+T application, or MAX77827DEWC+T equivalent, key selection criteria include its 1.8A ILIM option, WLP-12 package footprint (1.61mm × 2.01mm), FPWM/POK GPIO support, seamless buck-boost transition, and 2.5MHz fixed-frequency current-mode control - all critical for battery runtime optimization and transient response in IoT edge nodes.

Technical Context

The MAX77827DEWC+T implements a four-switch H-bridge topology with fixed 2.5MHz PWM control and cycle-by-cycle current sensing on high-side MOSFETs. Its unique control algorithm enables continuous conduction across buck, buck-boost, and boost regions without mode-hopping artifacts, delivering stable regulation when V_IN crosses V_OUT.

It features dual protection-triggered shutdown paths: immediate thermal shutdown at +165°C (20°C hysteresis) and SYS UVLO with rising/falling thresholds of 1.75V/1.68V (for A/D options). Soft-start time is 1.5ms (typ), and active output discharge uses an internal 100Ω switch tied to PGND.

Key Specifications

Pinout & Package

MAX77827DEWC+T is packaged in a 1.61mm × 2.01mm, 12-bump wafer-level package (WLP) with 0.4mm pitch. The bump layout follows standard top-view (bump side down) orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS63802DLCT and NCP1529MUTBG, the MAX77827DEWC+T provides the lowest quiescent current (6μA), smallest WLP footprint (1.61mm × 2.01mm), and integrated POK/FPWM functionality - making it optimal for ultra-low-power, space-constrained, and system-monitoring-critical designs.

Availability

MAX77827DEWC+T is available at Aetrix Electronics and suitable for smart wearables, LPWAN modems, and portable medical devices requiring stable component supply, long battery life, and minimal PCB area.

Supply support for MAX77827DEWC+T 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 precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and consumer applications.

The MAX77827 product line targets ultra-low-power, high-density battery-powered systems - specifically engineered to replace multiple discrete regulators in wearables, IoT endpoints, and cellular modules with a single efficient buck-boost solution.

FAQ

What is the switching current limit for MAX77827DEWC+T?

The MAX77827DEWC+T has a nominal switching current limit of 1.8A, confirmed in Table 1 of the datasheet for all B/D variants including MAX77827DEWC+T. This defines the peak inductor current during operation and directly determines maximum achievable output current in boost mode (e.g., 900mA at 3.3V_OUT with 3.0V_IN). The 1.8A ILIM is factory-set and not user-adjustable.

Does MAX77827DEWC+T support adjustable output voltage?

Yes, MAX77827DEWC+T supports fully adjustable output voltage from 2.3V to 5.3V using a single external resistor connected to the SEL pin. Table 2 in the datasheet specifies exact R_SEL values - for example, an open circuit yields 3.3V, while a 909kΩ resistor sets 2.3V. The IC reads R_SEL during startup (after ~600μs) and configures the internal reference accordingly.

What package type does MAX77827DEWC+T use?

MAX77827DEWC+T uses a 12-bump wafer-level package (WLP) with dimensions 1.61mm × 2.01mm and 0.4mm pitch. This is distinct from the FC2QFN option used by other variants like MAX77827BEFD+T. The WLP package enables the smallest PCB footprint among MAX77827 family members and is optimized for ultra-thin portable designs.

How does the POK pin function on MAX77827DEWC+T?

The POK (Power-OK) pin on MAX77827DEWC+T is an open-drain output that signals valid regulation: it pulls high (via external pull-up) when V_OUT reaches ≥92.5% of the target voltage, and releases (goes high-impedance) when V_OUT falls below 90% of target. It asserts after soft-start completes and remains active during normal operation - providing reliable power-good status for system sequencers or host processors.

Can MAX77827DEWC+T operate in forced PWM mode?

Yes, MAX77827DEWC+T can operate in forced PWM (FPWM) mode by driving the FPWM pin logic-high. In this mode, the regulator bypasses SKIP mode entirely and runs continuously at 2.5MHz regardless of load current. This reduces output voltage ripple and EMI variability - critical for RF-sensitive applications like cellular modems or precision ADC circuits powered by the same rail.