Battery chip powers USB devices
A Linear Technology Corp product story
Edited by the Electronicstalk editorial team Sep 7, 2007
Device combines an autonomous high-efficiency power manager, ideal diode controller and battery charger for portable USB devices.
The LTC4088 from Linear Technology combines an autonomous high-efficiency power manager, ideal diode controller and battery charger for portable USB devices.
The LTC4088's switching front-end topology features PowerPath control that optimises the power available from the USB port to charge the battery and power the application device with minimum power dissipation.
This feature eases thermal management issues in space-constrained media players, digital cameras, PDAs, GPS units and smart phones.
The IC also allows the load current to exceed the current drawn from the USB port while conforming to USB load specifications.
Featuring an input voltage range of 4.25 to 5.5V, the LTC4088 automatically limits its input current to a maximum of 1x (for USB 100mA), 5x (for USB 500mA) or 10x for wall-adapter powered applications (1A).
If the power source is removed, the IC ensures that system power is available from the battery to the application's load via current flow through an internal low loss 200mohm ideal diode, minimizing voltage drop and power dissipation.
An optional external ideal diode controller is provided for driving a PFET to reduce the overall ideal diode impedance below 40mohm.
The LTC4088's full-featured single-cell Li-ion/polymer battery charger has a constant-voltage, constant-current topology and allows for up to 1.2A charge current capability.
Its Bat-Track operation keeps power dissipation low in the battery charger for optimum charge time and less heat.
"Instant-on" operation allows the portable product to run immediately when power is applied without waiting for a discharged battery to charge.
Furthermore, the charger includes thermal limiting, automatic recharge, standalone operation with automatic charge termination and fixed duration safety timer, low voltage trickle charging, bad battery cell detection and a thermistor input for temperature-qualified charging.
Additional features of the IC are an "always-on" 3.V, 25mA LDO for system microprocessor rails, and a suspend LDO that prevents battery drain when a device is connected to a suspended USB port.
The LTC4088 is housed in a low-profile (0.75mm) 14-pin 3 x 4mm DFN package and is guaranteed for operation from -40 to +85C.
1000-piece pricing starts at US $2.20 each.
Not what you're looking for? Search the site.
Contact Linear Technology Corp
Tel +44 1628 477066
Other Linear Technology Corp stories
- Linear introduces LTC3603 buck regulator
The LTC3603 is a high efficiency, 3MHz synchronous buck regulator that uses a constant frequency, current-mode architecture. - Linear converter drives up to four strings of LEDs
Linear Technology has announced the LT3599, a 45V, 2.1MHz DC/DC boost-mode converter designed to operate as a constant current LED driver for up to 40 white LEDs. - Synchronous buck regulator launched by Linear
Linear Technology has launched the LTC3609 - a high-efficiency, synchronous buck regulator that can deliver up to 6A of continuous output current at voltages as low as 0.6V. - Linear updates circuit simulation software
Linear Technology has announced LTspice IV, a major update to its free Spice circuit simulation software LTspice/SwitcherCADIII. - DC/DC converter for GSM and GPRS cards
Linear Technology has announced the LTC3125, a 1.6MHz current mode, synchronous boost DC/DC converter with an accurate and programmable average input current limit.
Articles by product category
- Active Components (11,579)
- Active Components (4)
- Analogue and Mixed Signal ICs (1,726)
- Communications ICs (Wired) (1,803)
- Discrete Power Devices (418)
- Programmable Logic Devices (597)
- Microprocessors, Microcontrollers and DSPs (2,157)
- Memory Devices and Modules (760)
- Power Supply ICs and Controllers (2,391)
- Communications ICs (Wireless) (1,578)
- Standard Logic Devices (145)
- Passive Components (3,138)
- Passive Components (1)
- Capacitors (682)
- EMC Components (407)
- Frequency Control Components (410)
- Electromechanical Components (571)
- Circuit Protection Devices (494)
- Resistors (315)
- Transformers and Inductors (258)
- Design and Development (9,476)
- Design and Development (1)
- Embedded Software and Operating Systems (1,673)
- Design and Development Hardware (1,030)
- Intellectual Property Cores (1,538)
- Reference Designs (351)
- Design and Development Software (4,578)
- Design Services (305)
- Enclosures and Panel Products (3,362)
- Enclosures and Panel Products (2)
- Handheld and Other Small Enclosures (137)
- Instrument Cases, Benchtop, Wall-Mounting Enclosures (338)
- Floor-Standing Racks, Cabinets, Enclosures (246)
- Fans and Blowers (223)
- Gaskets, Seals and Screens (123)
- Heatsinks and Thermal Management (198)
- LCD Modules (484)
- Monitors (132)
- Other OEM Display Modules, Meters (239)
- Switches and Keyboards (576)
- Rotary Controls, Joysticks etc (136)
- Indicators and Audio (79)
- Touchscreens and Touch Sensors (291)
- Printers, Knobs, Bezels, Other Panelware (151)
- Interconnection (3,028)
- Interconnection (10)
- Antennas and Feeders (304)
- Boards and Backplanes (153)
- Cables and Wires (455)
- PCB Connectors (598)
- Plugs and Sockets (1,174)
- Terminals and Power (279)
- Electronics Manufacturing, Packaging (3,182)
- Industry News (1,935)
- Optoelectronics (1,711)
- Power Supplies (2,461)
- Power Supplies (6)
- AC/DC Power Supplies (1,032)
- Batteries and Chargers (248)
- DC/DC Convertors (881)
- DC/AC Inverters (78)
- OEM Power Supplies (0)
- UPSs (216)
- Subassemblies (4,829)
- Subassemblies (2)
- VMEbus Boards, Assemblies (420)
- CompactPCI Boards, Assemblies (372)
- Embedded Computing and Control (1,261)
- Wireless Communications (1,075)
- Networking Hardware (906)
- PC-Compatible Boards, Assemblies (793)
- Test and Measurement (5,164)
- Test and Measurement (2)
- ATE Systems (392)
- Compliance Engineering (900)
- Sensors and Data Acquisition (901)
- Board-Level Instruments (542)
- Stand-Alone Instruments (2,008)
- Test Accessories (404)
