LTC4088-1/-2 - High Efficiency Battery Charger/USB Power Manager with Regulated Output Voltage


  • Switching Regulator Makes Optimal Use of Limited Power Available from USB Port to Charge Battery and Power Application
  • 180mΩ Internal Ideal Diode Plus External Ideal Diode Controller Seamlessly Provide Low Loss Power Path When Input Power is Limited or Unavailable
  • Automatic Charge Current Reduction Maintains 3.6V Minimum VOUT
  • Full Featured Li-Ion/Polymer Battery Charger
  • VBUS Operating Range: 4.25V to 5.5V (7V Absolute Maximum—Transient)
  • 1.2A Maximum Input Current Limit
  • 1.5A Maximum Charge Current with Thermal Limiting
  • Bat-Track Adaptive Output Control
  • Slew Control Reduces Switching EMI
  • Low Profile (0.75mm) 14-Lead 4mm × 3mm DFN Package

Typical Application

LTC4088-1 Typical Application
LTC4088-1 Typical Application


The LTC4088-1/LTC4088-2 is a high efficiency USB PowerPath TM controller and Li-Ion/Polymer battery charger. It includes a synchronous switching input regulator, a full-featured battery charger and an ideal diode. Designed specifically for USB applications, the LTC4088-1/LTC4088-2's switching regulator automatically limits its input current to either 100mA, 500mA or 1A via logic control. The LTC4088-1 powers-up with the charger off; the LTC4088-2 powers-up with the charger on.

The switching input stage provides power to VOUT where power sharing between the application circuit and the battery charger is managed. Charge current is automatically reduced to maintain a regulated 3.6V VOUT during low-battery conditions. As the battery is charged, VOUT tracks VBAT for high efficiency charging. This feature allows the LTC4088-1/LTC4088-2 to provide more power to the application and eases thermal issues in constrained applications.

An ideal diode ensures that system power is available from the battery when the input current limit is reached or if the USB or wall supply is removed. The LTC4088-1/LTC4088-2 is available in the low profile 14-Lead 4mm x 3mm x 0.75mm DFN surface mount package.

 Input Logic Truth TableAutomatic Charge Current Reduction3.3V LDO
LTC4088 Battery charger enabled with all logic inputs grounded No Yes
LTC4088-1 Battery charger enabled with all logic inputs grounded Yes No
LTC4088-2 Battery charger enabled with all logic inputs grounded Yes No


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC4088EDE-1#PBF 4x3 DFN-14 DE E 05-08-1708 Yes
LTC4088EDE-1#TRPBF 4x3 DFN-14 DE E 05-08-1708 Yes
LTC4088EDE-2#PBF 4x3 DFN-14 DE E 05-08-1708 Yes
LTC4088EDE-2#TRPBF 4x3 DFN-14 DE E 05-08-1708 Yes

LTC4088-1 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC4088EDE-1#PBF 4x3 DFN-14 E $3.14 $2.20 Yes
LTC4088EDE-1#TRPBF 4x3 DFN-14 E $2.26 Yes
LTC4088EDE-2#PBF 4x3 DFN-14 E $3.14 $2.20 Yes
LTC4088EDE-2#TRPBF 4x3 DFN-14 E $2.26 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1189A LTC4088EDE-1 Demo Board| High Efficiency Battery Charger/Power manager $150.00
DC1377A LTC4088EDE-2 | High Efficiency Battery Charger/Power Manager Contact Factory
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Click here to view our complete list of demo boards


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