Analog Devices Inc./Maxim Integrated MAX6848KATD3

Overview

MAX6848KATD3 from Maxim Integrated is a dual-output, ultra-low-power battery monitor with integrated microprocessor supervisor. It features two independent open-drain low-battery outputs (LBOL and LBOH), user-adjustable 582mV/615mV thresholds with 5% hysteresis, 150ms LBO timeout, and an open-drain active-low RESET output with factory-set 3.075V VCC reset threshold and 150ms timeout. It operates from 1.2V to 5.5V VCC and 1.6V to 5.5V VDD, supporting single-cell Li+ or multicell alkaline/NiMH systems.

For engineers reviewing the MAX6848KATD3 datasheet, MAX6848KATD3 pinout, MAX6848KATD3 application, or MAX6848KATD3 equivalent, this device delivers precise dual-threshold battery state signaling (low vs. dead) alongside reliable µP reset supervision in space-constrained portable electronics - critical for power sequencing, DC-DC converter shutdown control, and battery recovery stabilization.

Technical Context

The MAX6848KATD3 implements dual comparator-based monitoring using an internal 615mV reference, with separate high- and low-threshold inputs (HTHIN and LTHIN) driving independent LBOL and LBOH outputs. Each output asserts on falling input below its respective low-trip level (VLTH− = VHTH− = 582mV) and deasserts only after the input rises above its high-trip level (VLTH+ = VHTH+ = 615mV) for ≥150ms.

Its independent µP supervisor monitors VCC with a fixed 3.075V reset threshold (±75mV), asserting open-drain RESET low on VCC drop and holding for 150ms after VCC recovers. The MR pin provides debounced manual reset with 150ms timeout and internal 1.5kΩ pullup to VCC.

Key Specifications

Pinout & Package

MAX6848KATD3 is housed in an 8-pin SOT23 package (3.00mm × 2.60mm × 1.45mm), fully specified from −40°C to +85°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery monitor with µP supervisor applications.

Compared with MAX6849KATD3, MAX6848KATD3 offers open-drain RESET for flexible voltage-level translation but requires an external pullup; compared with TPS3808G125DBVR, it adds full dual-threshold battery state intelligence at the cost of higher design complexity and slightly higher quiescent current.

Availability

MAX6848KATD3 is available at Aetrix Electronics and suitable for battery-powered medical sensors, portable diagnostic devices, smart remote controls, and wearable fitness trackers requiring stable component supply across extended production lifecycles.

Supply support for MAX6848KATD3 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, medical, and portable applications.

The MAX6846–MAX6849 family was engineered specifically for ultra-low-power battery state monitoring and µP supervision in size- and energy-constrained portable electronics - emphasizing dual-threshold accuracy, hysteresis robustness, and minimal quiescent current.

FAQ

What is the exact VCC reset threshold voltage for MAX6848KATD3?

The MAX6848KATD3 has a factory-trimmed VCC reset threshold of 3.075V, with a guaranteed tolerance of ±75mV over the full −40°C to +85°C temperature range. This value is fixed and corresponds to the 'T' suffix in the ordering code, as defined in Table 1 of the MAX6846–MAX6849 datasheet. The MAX6848KATD3 does not support user adjustment of this reset threshold.

How do the LBOL and LBOH outputs differ in function and timing for MAX6848KATD3?

LBOL asserts when LTHIN falls below 582mV and deasserts only after LTHIN rises above 615mV for ≥150ms; LBOH asserts when HTHIN falls below 582mV and deasserts only after HTHIN rises above 615mV for ≥150ms. Both are open-drain, active-low, and operate independently - enabling discrete "low battery" (LBOH) and "battery depleted" (LBOL) signals with guaranteed hysteresis and timeout behavior in the MAX6848KATD3.

Can MAX6848KATD3 monitor a single Li+ cell directly without external resistors?

No - the MAX6848KATD3 requires external resistor dividers on LTHIN and HTHIN to scale the battery voltage down to its 582mV/615mV internal thresholds. For a nominal 3.6V Li+ cell, typical divider ratios yield ~615mV at the inputs when VBAT = 3.6V. Direct connection would exceed the absolute maximum input rating and prevent proper threshold detection in the MAX6848KATD3.

What is the purpose of the MR pin on MAX6848KATD3, and how is it debounced?

The MR pin on MAX6848KATD3 provides a manual reset input with built-in 150ms rising-edge debounce (tDEB). When pulled low, it triggers a one-shot RESET pulse for 150ms (tMRP). The internal 1.5kΩ pullup to VCC allows direct pushbutton-to-GND use. Debounce ignores subsequent falling edges within 150ms of a valid assertion, preventing switch bounce from causing multiple resets in the MAX6848KATD3.

Does MAX6848KATD3 support operation with VCC and VDD supplied from different sources?

Yes - the MAX6848KATD3 accepts independent VCC (1.2V–5.5V) and VDD (1.6V–5.5V) supplies. The device powers itself from the higher of the two, while VCC exclusively feeds the reset supervisor circuitry and MR input. This allows VDD to connect directly to a battery for LTHIN/HTHIN scaling, and VCC to connect to a regulated rail for clean reset generation - a key capability confirmed in the MAX6848KATD3 datasheet.