MAX846A
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MAX846A

Cost-Saving, Multichemistry, Battery Charger System

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Universal Charger with Low-Cost µC or Stand-Alone Li+ Charger

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Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $3.96
Features
  • Multichemistry Charger System (Li-Ion, NiMH, NiCd)
  • Independent Voltage and Current Loops
  • ±0.5% Internal Reference for Li-Ion Cells
  • Lowers Cost:
    • Stands Alone or Uses Low-Cost µC
    • Built-In 1% Linear Regulator Powers µC
    • Linear Regulator Provides Reference to µC ADCs
    • Built-In µC Reset
    • Controls Low-Cost External PNP Transistor or P-Channel MOSFET
  • Space-Saving 16-Pin QSOP
  • Charging-Current-Monitor Output
  • < 1µA Battery Drain when Off
Additional Details
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The MAX846A is a cost-saving multichemistry battery-charger system that comes in a space-saving 16-pin QSOP. This integrated system allows different battery chemistries (Li-Ion, NiMH or NiCd cells) to be charged using one circuit.

In its simplest application, the MAX846A is a stand-alone, current-limited float voltage source that charges Li-Ion cells. It can also be paired up with a low-cost microcontroller (µC) to build a universal charger capable of charging Li-Ion, NiMH, and NiCd cells.

An internal 0.5%-accurate reference allows safe charging of Li-Ion cells that require tight voltage accuracy. The voltage- and current-regulation loops used to control a low-cost external PNP transistor (or P-channel MOSFET) are independent of each other, allowing more flexibility in the charging algorithms.

The MAX846A has a built-in 1%, 3.3V, 20mA linear regulator capable of powering the µC and providing a reference for the µC's analog-to-digital converters. An on-board reset notifies the controller upon any unexpected loss of power. The µC can be inexpensive, since its only functions are to monitor the voltage and current and to change the charging algorithms.

Applications

  • Cell Phones
  • Desktop Cradle Chargers
  • Handheld Instruments (PDAs, Palmtops)
  • Li+ Battery Packs
  • Li+-Ion/NiMH/NiCd Multichemistry Battery Chargers
  • Notebook Computers
Part Models 2
1ku List Price Starting From $3.96

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Jul 28, 2023

- 2361H

WAFER FAB

MAX846AEEE+

PRODUCTION

MAX846AEEE+T

PRODUCTION

Jan 24, 2019

- 1746N

ASSEMBLY

MAX846AEEE+

PRODUCTION

MAX846AEEE+T

PRODUCTION

Filter by Model

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Reset Filters

Part Models

Product Lifecycle

PCN

Jul 28, 2023

- 2361H

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WAFER FAB

MAX846AEEE+

PRODUCTION

MAX846AEEE+T

PRODUCTION

Jan 24, 2019

- 1746N

arrow down

ASSEMBLY

MAX846AEEE+

PRODUCTION

MAX846AEEE+T

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX846AEVKIT

Evaluation Kit for the MAX846A

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MAX846AEVKIT

Evaluation Kit for the MAX846A

Evaluation Kit for the MAX846A

Features and Benefits

  • 0.5% Internal Reference for Li-Ion Charging
  • Regulates Voltage and Current into Battery
  • Selectable 1 or 2-Cell Li-Ion Charge
  • 1%, 3.3V, On-Chip, Low-Dropout Linear Regulator
  • 1µA Max Battery Drain when Off
  • Power-Good Function
  • Surface-Mount Components
  • Fully Assembled and Tested

Product Detail

The MAX846A evaluation kit (EV kit) is a stand-alone charger for lithium-ion (Li-Ion) batteries. The charging regulator consists of voltage and current loops driving an external, low-cost, PNP pass transistor. In voltage-regulation mode, a current-to-voltage converter supplies a voltage proportional to the current flowing through the Li-Ion battery. The float voltage and charging current can be programmed with just two external resistors. The MAX846A EV kit is shipped configured for charging two Li-Ion cells at 800mA from a 10V power source.

The MAX846A EV kit is a fully assembled and tested surface-mount printed circuit board.

Applications

  • Cell Phones
  • Desktop Cradle Chargers
  • Handheld Instruments (PDAs, Palmtops)
  • Li+ Battery Packs
  • Li+-Ion/NiMH/NiCd Multichemistry Battery Chargers
  • Notebook Computers

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