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Backup Battery Charger and Boost Controller

Integrated Backup Battery Charger and Boost Controller

Product Details

Key Features

Parametric specs for Battery Chargers
Charging VIN (V) (max) 7
Max. ICHG (A) 1
Cell Chemistry Li-Ion
NiMH
# NiMH/ NiCd Cells 2
3
5
# Lithium Ion Cells 1
Protected VIN (V) (max) 7
Charger (V) 0 to 7
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN-CU/28
Budgetary
Price (See Notes)
3.69
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Simplified Block Diagram

Technical Docs

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Parameters

Parametric specs for Battery Chargers
Charging VIN (V) (max) 7
Max. ICHG (A) 1
Cell Chemistry Li-Ion
NiMH
# NiMH/ NiCd Cells 2
3
5
# Lithium Ion Cells 1
Protected VIN (V) (max) 7
Charger (V) 0 to 7
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN-CU/28
Budgetary
Price (See Notes)
3.69

Key Features

  • Efficient Solution
    • Minimum 2V Sync Boost with n-Channel FET Control
    • Skip Mode Guarantees > 50% Efficiency at 1mA
  • Multiple Functions to Enable Small Solution Size
    • 3V to 6V CC/CV Battery Charger
    • I2C-Settable Charging Current up to 1A
    • I2C-Selectable CV Voltage and CC Current Levels
    • Gate-Driver Output for p-Channel Load Disconnect
    • Backup Battery Switchover-Trigger Signal
  • State-of-Health for Backup Battery Monitoring
    • I2C Interface Diagnostics and Control Interface
    • Accurate Internal Current Sink for Battery Impedance Measurement
    • Analog Readout of Internal Sink Current from Backup Battery
    • Remote Sense for BATT_ Voltage Measurement
  • Robust for Automotive Environment
    • 3.5V to 36V VIN (40V Load-Dump Tolerant)
    • < 1µA Leakage for Pins Connected to the Battery
    • -40°C to +125°C Operating Temperature Range
    • 28-Pin, Side-Wettable TQFN Package Enables Optical Inspection

Applications/Uses

  • Automotive Telematics Battery Backup
  • Single or Multicell Battery-Backup Systems

Description

The MAX20094/MAX20095 ICs combine a configurable constant-current/constant-voltage (CC/CV) battery charger with a high-efficiency synchronous boost controller to supply critical systems in the event the primary power source is lost. In addition, diagnostic features are available to check battery state-of-health (SOH) and IC functionality. Charging thresholds and the boost output voltage are configurable to support popular battery chemistries and a wide range of cell counts. To support system integration, the ICs have an I2C target port through which configuration and status bits can be accessed.

Switching frequency of 2.2MHz also helps to reduce system cost by minimizing inductor size. The ICs also include a precision battery SOH check and have built-in functionality to minimize leakage current out of the backup battery (BUB).

The MAX20094/MAX20095 are available in a 28-pin (5mm x 5mm) side-wettable TQFN package and are AECQ-100 qualified.

Simplified Block Diagram

MAX20094, MAX20095: Simplified Block Diagram MAX20094, MAX20095: Simplified Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.