Battery Charger delivers up to 2 A in 3 x 3 mm package.

Press Release Summary:

Designed for 2-cell Li-Ion/Polymer batteries, monolithic Model LT3650-8.2 accepts inputs up to 32 V and has 40 V absolute max rating. Device features operating frequency of 1 MHz and switch-mode architecture to minimize power dissipation. Charge current is programmable and dynamically adjustable up to 2 A. Once charging is terminated, LT3650-8.2 automatically enters low current standby mode that reduces input supply current to 85 µA. User can select timer or C/10 termination.

Original Press Release:

32V Monolithic 2-Cell Li-Ion/Polymer Battery Charger Delivers up to 2A in Compact 3mm x 3mm Package

MILPITAS, CA - February 12, 2009 - Linear Technology Corporation introduces the LT3650-8.2, a compact, monolithic high-voltage battery charger for 2-cell Li-Ion/Polymer batteries. The device's switch-mode architecture minimizes power dissipation without compromising board space. The LT3650-8.2 accepts inputs up to 32V and has a 40V absolute maximum rating for added system margin. User-selectable timer or C/10 termination requires no external microcontroller and simplifies the design. Charge current is programmable and dynamically adjustable up to 2A; the power device is integrated on chip to save board space. The LT3650-8.2 does not require external high-precision resistors to set the float voltage, further saving cost and space. Applications include industrial handheld instruments, 12V to 24V automotive and heavy equipment, desktop cradle chargers and small notebook or tablet computers.

The LT3650-8.2's high operating frequency of 1MHz and current mode architecture allow the use of small inductors and capacitors, minimizing noise and filtering needs. Final float voltage accuracy is specified at ±0.5%, charge current accuracy is ±5% and C/10 detection accuracy is ±2.5%. Once charging is terminated, the LT3650-8.2 automatically enters a low current standby mode that reduces the input supply current to 85uA. In shutdown, the input bias current is reduced to 15uA. The LT3650-8.2 maximizes battery life during all non-charging periods, draining less than 1uA from the battery. For safety and autonomous charge control, the LT3650-8.2 includes features such as automatic restart and preconditioning, a thermistor input for temperature-qualified charging, programmable input current limit, bad battery detection and binary coded status output pins.

The LT3650-8.2 is available in a compact, low-profile (0.75mm) 12-pin 3mm x 3mm DFN package, and is offered in both E and I grade versions, both operating from -40°C to +85°C. Pricing starts at $2.80 and $3.22 each, respectively, in 1,000-piece quantities. For more information, visit

Summary of Features: LT3650-8.2

Wide Input Voltage Range: 9V to 32V (40V Absolute Maximum)

Programmable Charge Current up to 2A

2 Cell Li-Ion/Polymer Charge Capability, 8.2V Charge Voltage

User-Selectable Termination: C/10 or Programmable Termination Timer

Dynamic Charge Rate Programming/Soft-Start Pin

Programmable Input Current Limit

1MHz Switching Frequency Enables Small External Components

±0.5% Charge Voltage Accuracy

±5% Charge Current Accuracy

±2.5% C/10 Detection Accuracy

NTC Resistor Temperature Monitor

Automatic Recharge

Automatic Preconditioning

Binary Coded Open-Collector Charge Status Pins

Bad Battery Detection with Auto-Reset

Compact, Low-Profile (0.75mm) 3mm x 3mm DFN-12 Package

About Linear Technology

Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, uModule(TM) products, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.

LT, LTC and LTM are registered trademarks and uModule is a trademark of Linear Technology Corp. All other trademarks are the property of their respective owners.

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