MAX8895X

Li-Ion Chargers with Smart Power Selector, Adapter Type Detection, and USB Enumeration

Industry's First Charger to Detect Adapter Type and Enumerate Autonomously


Description

The MAX8895_ USB-compliant linear battery chargers operate from either a USB port or dedicated charger with automatic detection of adapter type and USB enumeration capability. The MAX8895X/MAX8895Y integrate the battery disconnect switch, current-sense circuit, MOSFET pass elements, and thermal regulation circuitry, and eliminate the external reverse-blocking Schottky diode to create the simplest and smallest stand-alone charging solutions.

The MAX8895_ include an automated detection of charge adapter type, making it possible to distinguish between USB 2.0 device, USB charger, and dedicated charger devices. Furthermore, the MAX8895X/MAX8895Y include a USB enumeration function that automatically negotiates with a USB host, making it possible to achieve the highest current available from a USB 2.0 device or USB charger without processor intervention. The adapter type detection is compliant with USB 2.0 specification as well as USB charging Revision 1.1.

The MAX8895_ control the charging sequence for single-cell Li+ batteries from initial power-OK indication, through prequalification, fast-charge, top-off, and finally charge termination. Charging is controlled using constant current, constant voltage, and constant die-temperature (CCCVCTj) regulation for safe operation under all conditions. The maximum charging current is adaptively controlled by subtracting the system current from the input current limit, ensuring that the charging current is always maximized for any given operating condition.

The MAX8895_ feature optimized smart power control to make the best use of limited USB or adapter power. Battery charge current is set independently of the SYS_ input current limit. Power not used by the system charges the battery. Automatic input selection switches the system from battery to external power. This allows the application to operate without a battery, discharged battery, or dead battery.

Other features include undervoltage lockout (UVLO), overvoltage protection (OVP), charge status flag, charge fault flag, power-OK monitor, battery thermistor monitor, charge timer, and a 3.3V output.

The MAX8895_ operate from a +4.0V to +6.6V supply and include overvoltage protection up to +16V. The MAX8895_ are specified over the extended temperature range (-40°C to +85°C) and are available in a compact 2.36mm x 2.36mm, 25-bump WLP package (0.4mm pitch).

Key Features

  • Enables Charging from a USB Port*
  • Automatic Detection of Adapter Type
  • Enumeration Capability Without Processor Intervention
  • USB Low-Speed Operation Without External Crystal (MAX8895V/MAX8895W/MAX8895X)
  • USB Full-Speed Operation Using an External Crystal (MAX8895Y)
  • Compliant with USB 2.0 Specification
  • Compliant with USB Charging Specification (Revision 1.1)
  • Adaptive Input Current Limit for Dedicated Charger
  • Input Overvoltage Protection to 16V
  • Automatic Current Sharing Between Battery Charging and System
  • Smart Power Selector™ Allows Operation with Discharged or No Battery
  • NTC Monitoring of Battery Temperature
  • No External MOSFETs Required
  • Thermal Regulation Prevents Overheating
  • 2µA Shutdown Current
  • Tiny 2.36mm x 2.36mm, 25-Bump, 0.4mm Pitch WLP Package

Applications/Uses

  • Bluetooth® Headsets
  • Charging Cradles
  • Portable Devices
Part Number Lithium Ion Cells Protected VIN
(V)
Charging VIN
(V)
Charge Rate Set by Max. ICHG
(A)
Charge Termination Charge Regulation Oper. Temp.
(°C)
Package/Pins
max max
MAX8895V  1 14 6.6
External Source
Resistor
1.85 Min. Charge Current Linear -40 to +85
WLP/25
MAX8895W 
WLP/25
MAX8895X 
WLP/25
MAX8895Y 
WLP/25
See All Battery Chargers (73)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX8895EVKIT: Evaluation Kit for the MAX8895W, MAX8895X, and MAX8895Y

Technical Documents

Tutorial 4803 The Basics of USB Battery Charging: A Survival Guide

Quality and Environmental Data

Request Reliability Report for: MAX8895X 
Lead-Free Package Tin (Sn) Whisker Reports

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