General Description

The MAX6427–MAX6438 are single/dual-level battery monitors with internal hysteresis. These devices are offered with single (MAX6427/MAX6428/MAX6429, MAX6433/MAX6434/MAX6435) or dual (MAX6430/MAX6431/MAX6432, MAX6436/MAX6437/MAX6438) low-battery output indicators, which can be used to indicate three battery conditions: battery is good (operate system in normal mode), battery is weak (operate system in low-power mode), or battery is empty (disable the system).

Features

♦ Factory-Trimmed or User-Adjustable Threshold Options

   Factory-Trimmed Low Thresholds from 1.6V to 2.1V or 2.6V to 3.1V in 100mV Increments (MAX6427–MAX6432)

   Factory-Trimmed High Thresholds from 2.3V to 2.6V or 3.3V to 3.6V in 100mV Increments (MAX6427–MAX6432)

   User-Adjustable Low/High Thresholds with 615mV Internal Reference (MAX6433–MAX6438)

♦ Low Current (1µA, typ)

♦ Single or Dual Low-Battery Outputs

♦ Push-Pull LBO, Open-Drain LBO, and Open-Drain LBO Options

♦ 140ms Minimum LBO Timeout Period

♦ Immune to Short Battery Voltage Transients

♦ Guaranteed Valid LBO Logic State to BATT = 1.0V

♦ -40°C to +85°C Operating Temperature Range

♦ Small 3, 4, 5 and 6-Pin SOT Packages

♦ No External Components Required (MAX6427–MAX6432)

Applications

Battery-Powered Systems (Single-Cell Li+ or Two/Three-Cell NiMH, NiCd, Alkaline)

Cell Phones/Cordless Phones

Pagers

Portable Medical Devices

PDAs

Electronic Toys

MP3 Players