LTC4040

RECOMMENDED FOR NEW DESIGNS

2.5A Battery Backup Power Manager

Data Sheet Product Selection Table
Part Models
4
1ku List Price
Starting From $3.49
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Part Details

  • Step-Up Backup Supply and Step-Down Battery Charger
  • 6.5A Switches for 2.5A Backup from 3.2V Battery
  • Input Current Limit Prioritizes Load Over Charge Current
  • Input Disconnect Switch Isolates Input During Backup
  • Automatic Seamless Switch-Over to Backup Mode
  • Input Power Loss Indicator
  • System Power Loss Indicator
  • Pin Selectable Battery: Li-Ion (3.95V/4.0V/4.05V/4.1V) or LiFePO4 (3.45V/3.5V/3.55V/3.6V)
  • Optional OVP Circuitry Protects Device to >60V
  • Constant Frequency Operation
  • Low Profile (0.75mm) 24-Lead 4mm × 5mm QFN Package
LTC4040
2.5A Battery Backup Power Manager
4.5V Backup Application with 4.22V PFI Threshold (Charge Current Setting: 1A, Input Current Limit Setting: 2A) Normal to Backup Mode Transition Waveform Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Application Note 2

Technical Articles 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Hardware Ecosystem

Parts Product Life Cycle Description
Low Voltage Hot Swap Controllers 1
LTC4231
RECOMMENDED FOR NEW DESIGNS Micropower Hot Swap Controller
PowerPath, Ideal Diodes, and Load Switches 1
LTC4417
RECOMMENDED FOR NEW DESIGNS Prioritized PowerPath™ Controller
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Evaluation Kits

eval board
schematic 1
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DC2118B

LTC4040 Demo Board | 5VIN, 2A Single Cell Li-ion/LiFePO4 Buck Battery Charger with 2.5A Boost Backup Power Manager

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Product Details

Demonstration circuit 2118B is a combination step-down battery charger and step-up battery backup regulator using the LTC4040 monolithic system power manager. The DC2118B has an input voltage range from 4.8V to 5.5V with overvoltage protection (OVP) to 40V, as limited by the external MOSFET. The input current is monitored to prioritize the load up to the 2.5A threshold before charge current is reduced.

Battery Charging

As initially configured, DC2118B is programmed for 2A charge current limit when in charge mode. The charge voltage is jumper-selectable in 8 discrete steps from 3.45V to 3.6V for LiFePO4 chemistry or 3.95V to 4.1V for Li-ion chemistry, according to the F2/F1/F0 programming input settings.

The charge current limit is adjustable via the PROG pin resistor. End-of-charge status is triggered by current falling below C/8 and indicated by the CHRG LED. The optional NTC input provides temperature fault detection and status indicated by the FAULT LED. Charging can be enabled/disabled with the ENCHG jumper.

Battery Backup

Following an input power failure, the circuit automatically shifts to battery backup boost mode to regulate the VSYS output rail. The backup mode system output voltage is initially programmed for 5V. The input power failure status is indicated by the PFO LED.

If VSYS ever falls below the programmed reset threshold voltage, the RST LED will change states to indicate the need to reset the system and recharge the battery. Backup regulation can be enabled/disabled with the ENBST jumper.

For convenience, all LEDs can be disabled with the LED jumper to reduce the quiescent current of the system.

eval board
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DC2118A

OBSOLETE: LTC4040 Demo Board | 5VIN, 2A Single Cell Li-ion/LiFePO4 Buck Battery Charger with 2.5A Boost Backup Power Manager

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Product Details

This evaluation board is obsolete and no longer recommended.

Demonstration circuit 2118A is a combination step-down battery charger and step-up battery backup regulator using the LTC4040 monolithic system power manager. The DC2118A has an input voltage range from 4.8V to 5.5V with overvoltage protection (OVP) to 40V, as limited by the external MOSFET. The input current is monitored to prioritize the load up to the 2.5A threshold before charge current is reduced.
DC2118B
LTC4040 Demo Board | 5VIN, 2A Single Cell Li-ion/LiFePO4 Buck Battery Charger with 2.5A Boost Backup Power Manager
DC2118B Evaluation Board DC2118B Evaluation Board - Top View DC2118B Evaluation Board - Bottom View DC2118B Application Circuit
DC2118A
OBSOLETE: LTC4040 Demo Board | 5VIN, 2A Single Cell Li-ion/LiFePO4 Buck Battery Charger with 2.5A Boost Backup Power Manager
DC2118A Demo Board DC2118A Demo Board DC2118A Demo Board DC2118A Demo Board DC2118A - Schematic

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