Analog Devices Inc./Maxim Integrated MAX6848KASD3+T

Overview

MAX6848KASD3+T from Maxim Integrated is a dual-output, ultra-low-power battery monitor with integrated microprocessor supervisor. It provides independent high- and low-threshold detection (LBOH/LBOL) for single-cell Li+ or multicell alkaline/NiMH batteries, features 615mV internal reference, 2.5µA typical supply current, and 150ms LBO timeout - used in portable medical devices to manage power sequencing during battery depletion.

For engineers reviewing the MAX6848KASD3+T datasheet, MAX6848KASD3+T pinout, MAX6848KASD3+T application, or MAX6848KASD3+T equivalent, key selection criteria include dual low-battery output timing behavior, VCC reset threshold selection (S-suffix = 2.925V), 150ms reset timeout (D3 suffix), SOT23-8 package compatibility, and open-drain RESET/LBOH/LBOL drive capability up to 5.5V.

Technical Context

The MAX6848KASD3+T implements two independent comparator channels - one for LTHIN (LBOL activation at 582mV⁻/615mV⁺) and one for HTHIN (LBOH activation at 582mV⁻/615mV⁺) - each with 5% typical hysteresis to prevent chatter during battery recovery. Its internal 615mV reference enables precise resistor-divider-based threshold programming across wide input voltage ranges.

It integrates an independent VCC supervisor with factory-trimmed 2.925V reset threshold (S-suffix), 150ms minimum reset timeout (D3 suffix), and manual reset (MR) with 150ms debounce. The open-drain RESET output asserts active-low when VCC falls below threshold and remains asserted for the full timeout after VCC recovers.

Key Specifications

Pinout & Package

MAX6848KASD3+T is housed in an 8-pin SOT23 package (3.0mm × 2.6mm body, 0.65mm pitch). Pin 1 marked by dot; leads are lead-free per +T suffix.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery monitoring and µP supervision applications.

Compared with MAX6849KASD3+T, the MAX6848KASD3+T offers lower system BOM cost (no pull-up needed for RESET) and higher noise immunity in noisy battery paths; versus TPS3808G125DBVR, it delivers full battery state awareness but consumes slightly more current (2.5µA vs. 0.36µA).

Availability

MAX6848KASD3+T is available at Aetrix Electronics and suitable for portable medical devices, digital cameras, industrial handheld scanners, and smart PDAs requiring stable component supply across extended production lifecycles.

Supply support for MAX6848KASD3+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 and mixed-signal ICs for power, sensing, and interface applications in industrial, medical, and portable markets.

The MAX6846–MAX6849 family was engineered specifically for ultra-low-power battery state monitoring and µP supervision in space-constrained, long-life portable systems - balancing accuracy, configurability, and sub-µA quiescent operation.

FAQ

What battery chemistries does the MAX6848KASD3+T support?

The MAX6848KASD3+T supports single-cell lithium-ion (3.0–4.2V), two- or three-cell alkaline/NiCd/NiMH (2.4–4.5V), and other chemistries via external resistor dividers on LTHIN and HTHIN. Its 615mV internal reference and 5% hysteresis enable accurate, chatter-free monitoring across all these types without recalibration.

How do I configure the LBOH and LBOL thresholds for my specific battery voltage range?

Use a three-resistor divider network on HTHIN (for LBOH) and LTHIN (for LBOL) as shown in Figure 5 of the MAX6848KASD3+T datasheet. For example, to set LBOL trip at 2.4V on a 3.6V battery, calculate R1/R2/R3 such that LTHIN = 582mV at 2.4V and 615mV at 2.52V (5% hysteresis). RTOTAL up to 500kΩ is supported.

Is the RESET output of the MAX6848KASD3+T compatible with 1.8V microcontrollers?

Yes - the MAX6848KASD3+T features an open-drain RESET output that can be pulled up to any logic rail from 1.8V to 5.5V. When asserted, RESET sinks current to GND (VOL ≤ 0.3V at 100µA), ensuring valid low-level signaling for 1.8V I/O standards without level-shifting circuitry.

Does the MAX6848KASD3+T require external capacitors for stable operation?

No external capacitors are required for basic operation. However, a 0.1µF capacitor from MR to GND is recommended in noisy environments or with long PCB traces to suppress switch bounce and EMI. No bypass caps are needed on VDD or VCC due to the device's ultra-low current and internal filtering.

What is the meaning of the 'S' and 'D3' suffixes in MAX6848KASD3+T?

The 'S' denotes the factory-trimmed VCC reset threshold of 2.925V (per Table 1), and 'D3' specifies the 150ms minimum reset timeout period (per Table 2). Together with 'K' (tape-and-reel packaging) and '+T' (lead-free), they fully define the electrical and mechanical configuration of the MAX6848KASD3+T.