LTC4066 - USB Power Manager with Low-Loss Ideal Diode and Li-Ion Battery Charger

Features

  • Click Here for LTC4066 Evaluation Kit
  • Seamless Transition Between Input Power Sources:
    Li-Ion Battery, USB and 5V Wall Adapter
  • Low Loss (50mΩ) Ideal Diode Path from BAT to OUT
  • Programmable Charge Current Detection (CHRG)
  • Load Dependent Charging Guarantees USB Input Current Compliance
  • Analog Gas Gauge Function
  • Charges Single Cell Li-Ion Batteries Directly from USB Port
  • Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate Without Risk of Overheating*
  • Selectable 100% or 20% Current Limit (e.g., 500mA/100mA)
  • Termination Timer Adapts to Actual Charge Current
  • Preset 4.2V Charge Voltage with 0.8% Accuracy (4.1V for LTC4066-1)
  • NTC Thermistor Input for Temperature Qualified Charging
  • Thin Profile (0.75mm) 24-Lead 4mm x 4mm QFN Package
  • Ultrathin Profile (0.55mm) 24-Lead 4mm x 4mm UTQFN Package (LTC4066 Only)

Typical Application

LTC4066
LTC4066
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Description

The LTC4066/LTC4066-1 are USB power managers and Li-Ion battery chargers designed to work in portable battery-powered applications. The parts control the total current used by the USB peripheral for operation and battery charging. The total input current can be limited to 100mA, 500mA or “unlimited” (i.e., above 2A). Battery charge current is automatically reduced such that the sum of the load current and the charge current does not exceed the programmed input current limit.

The LTC4066/LTC4066-1 include a standalone constant-current / constant-voltage linear charger for single cell Li-ion batteries. The float voltage applied to the battery is held to a tight 0.8% tolerance, and charge current is programmable using an external resistor to ground. A programmable end-of-charge status output (CHRG) indicates full charge. BAT pin charge and discharge cur- rents can be monitored via an analog output (ISTAT). Total charge time is programmable by an external capacitor to ground. When the battery drops 100mV below the float voltage, automatic recharging of the battery occurs. Also featured is an NTC thermistor input used to monitor bat- tery temperature while charging.

The LTC4066/LTC4066-1 are available in a 24-pin thin profile (0.75mm) 4mm x 4mm QFN package. The LTC4066 is also available in a 24-pin ultrathin profile (0.55mm) 4mm x 4mm UTQFN package.
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Packaging

QFN-24

LTC4066
LTC4066
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Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC4066EPF#PBF QFN 24 E $3.36 $2.35 View
LTC4066EPF#TRPBF QFN 24 E   $2.41 View
LTC4066EUF#PBF QFN 24 E $3.29 $2.30 View
LTC4066EUF#TR QFN 24 E   $2.40 View
LTC4066EUF#TRPBF QFN 24 E   $2.40 View
LTC4066EUF-1#PBF QFN 24 E $3.29 $2.30 View
LTC4066EUF-1#TRPBF QFN 24 E   $2.40 View
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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.

Evaluation Kits

Part Number Description Price
DC848A LTC4066EUF | USB Power Manager and Li-Ion Charger $150.00
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Applications

  • Portable USB Devices
  • GPS, Cameras, Broadband Wireless Modems
  • Mulitple Input Chargers
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Simulate

To simulate selected Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

For other simulation tools, visit our Design Simulation and Device Models page.

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