Tag Archives: Linear

35VIN & VOUT battery charge controller delivers up to 20A

4015

LTC4015 is a highly integrated, high voltage multichemistry synchronous step-down battery charger controller with onboard telemetry functions. The device efficiently transfers power from a variety of input sources, such as wall adapters and solar panels, to a Li-Ion/Polymer, LiFePO4 or lead-acid battery stack and system load up to 35V.

It provides advanced system monitoring and management functionality, including battery Coulomb counting and health monitoring. While a host microcontroller is required to access the most advanced features of the LTC4015, the use of an I²C port is optional. The main charging features of the product can be adjusted using pin-strap configurations and programming resistors.

35VIN & VOUT battery charge controller delivers up to 20A – [Link]

LTC6268-10 – 4GHz Ultra-Low Bias Current FET Input Op Amp

6268-10

The LTC6268-10 is a single 4GHz FET input op amp for high dynamic range and high speed transimpedance amplifier (TIA) applications. This new decompensated amplifiers extend the speed and dynamic range capabilities of this ultralow bias current op amp family for applications with a gain of 10 or higher. Input bias current is 0.9pA max over the 40°C to 85°C temperature range and just 4pA max over the entire 40°C to 125°C temperature range. Wideband voltage and current noise are 4nV/√Hz and 7fA/√Hz, respectively. With 0.45pF input capacitance and 1000V/μs slew rate, the LTC6268-10 is well suited for photodiode and photomultiplier (PMT) circuits, high impedance sensor applications and for driving analog to digital converters (ADCs). The part is also available as a dual op amp (LTC6269-10) and in unity gain stable options (single LTC6268 and dual LTC6269).

LTC6268-10 – 4GHz Ultra-Low Bias Current FET Input Op Amp – [Link]

 

IC manages battery-backup systems

4040

Housed in a low-profile 24-pin QFN package, the LTC4040 from Linear Technology is a 2.5-A lithium-battery–backup power-management system for 3.5-V to 5-V supply rails that must be kept active during a main power failure. The device uses an on-chip bidirectional synchronous converter to provide high-efficiency battery charging, as well as high-current, high-efficiency backup power.

When external power is available, the LTC4040 operates as a step-down battery charger for single-cell lithium ion or lithium iron phosphate batteries, while giving preference to the system load. When the input supply drops below the adjustable power-fail-input threshold, the LTC4040 operates as a step-up regulator capable of delivering up to 2.5 A to the system output from the backup battery. In the event of a power failure, the part provides reverse blocking and a seamless switchover between input power and backup power.

IC manages battery-backup systems – [Link]

LT3088 – 800mA Single Resistor Rugged Linear Regulator

20150610022453_3088

by elektormagazine.com:

Most new voltage regulator chips are based on some variant of the digital switch-mode design which offers better efficiency compared with the more traditional linear regulator designs. Linear Technology has bucked the trend by introducing a new three-terminal linear regulator which offers some significant improvements on earlier designs.

The LT3088 has an input range from 1.2 V to 36 V with an extended safe operating area (SOA) compared to existing regulators, making it ideal for high input-to-output voltage and high output current applications where older regulators limit the output. The LT3088 uses a current source reference, allowing a single resistor to set the output voltage from 0 V to 34.5 V (with 1.2 V dropout). This regulator architecture, combined with low millivolt line and load regulation, enables multiple ICs to be paralleled easily for heat spreading and higher output current. The on-chip trimmed 50 µA current reference is ±1% accurate. The regulation, transient response and output noise (27 µVRMS) are independent of output voltage thanks to its voltage follower architecture.

LT3088 – 800mA Single Resistor Rugged Linear Regulator – [Link]

LT8616 – Dual 42V Synchronous Monolithic Step-Down Regulator with 6.5μA Quiescent Current

 

8616

The LT8616 is a high efficiency dual synchronous monolithic step-down switching regulator with an input voltage range of 3.4V to 42V. Its dual channel design delivers independent 2.5A and 1.5A continuous current to outputs as low as 0.8V. A dual channel synchronous rectification topology delivers up to 95% efficiency while Burst Mode operation keeps quiescent current under 6.5μA (both channels enabled) in no-load standby conditions, making it ideal for always-on systems. Switching frequency can be programmed from 200kHz to 3MHz and is synchronizable throughout this range. The LT8616’s 35ns minimum on-time enables 16V to 1.8V step-down conversions, while switching at 2MHz helps designers avoid critical noise-sensitive frequency bands, such as AM radio while having a very compact solution footprint.

LT8616 – Dual 42V Synchronous Monolithic Step-Down Regulator with 6.5μA Quiescent Current – [Link]

High Voltage Buck-Boost Regulator

8056

The LTM8056 from Linear Technology is a 58 VIN, buck-boost μModule® (micromodule) regulator which requires just a few external passive components to complete the regulator design. Included in the package are the switching controller, power switches, inductor and support components. The basic external components needed are a single resistor to set the switching frequency, a resistor divider network to set the output voltage together with input and output capacitors. Other features such as input and output average current regulation may be implemented with just a few additional components. The LTM8056 operates with an input voltage ranging from 5 V to 58 V and can supply a regulated output voltage between 1.2 V and 48 V. The SYNC input and CLKOUT signal output provide clock synchronization options.

High Voltage Buck-Boost Regulator – [Link]

Buck controller needs just 29 µA in standby

3892-1

The LTC®3892/LTC3892-1 is a high performance dual step-down DC/DC switching regulator controller that drives all N-channel synchronous power MOSFET stages. Power loss and noise are minimized by operating the two controller output stages out-of-phase.

The gate drive voltage can be programmed from 5V to 10V to allow the use of logic or standard-level FETs and to maximize efficiency. Internal switches in the top gate drivers eliminate the need for external bootstrap diodes.

A wide 4.5V to 60V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. Output voltages up to 99% of VIN can be regulated. OPTILOOP ® compensation allows the transient response and loop stability to be optimized over a wide range of output capacitance and ESR values.

Buck controller needs just 29 µA in standby – [Link]

Buck-boost micromodules accept up to 60-V input

8056

The LTM®8055 is a 36VIN, buck-boost μModule® (micromodule) regulator. Included in the package are the switching controller, power switches, inductor and support components. A resistor to set the switching frequency, a resistor divider to set the output voltage, and input and output capacitors are all that are needed to complete the design. Other features such as input and output average current regulation may be implemented with just a few components. The LTM8055 operates over an input voltage range of 5V to 36V, and can regulate output voltages between 1.2V and 36V. The SYNC input and CLKOUT output allow easy synchronization.

The LTM8055 is housed in a compact overmolded ball grid array (BGA) package suitable for automated assembly by standard surface mount equipment. The LTM8055 is RoHS compliant.

Buck-boost micromodules accept up to 60-V input – [Link]

High-speed comparator cuts delays to 2.9 ns

6752

by Susan Nordyk @ edn.com:

Intended to drive logic levels of 3.3 V down to 1.8 V, the LTC6752 comparator from Linear Technology achieves fast rise and fall times of 1.2 ns and a toggle frequency of 280 MHz, making it one of the fastest CMOS-output comparators on the market. The device exhibits a propagation delay of only 2.9 ns and overdrive dispersion of just 1.8 ns. Jitter is 4.5 ps for a 100-mV pk-pk, 100-MHz sinusoidal input, and the outputs swing to within 200-mV of the rails with up to 8 mA of load current.

The LTC6752 offers five options in different packages with unique combinations of features, such as separate input and output supplies, low-power shutdown, output latch, adjustable hysteresis, and complementary outputs. Inputs extend beyond both rails, which is useful for single-supply operation. All five variants of the LTC6752 are capable of driving 3.3-V and 2.5-V logic. Three versions have separate input and output supplies, decoupling the input and output voltage levels and enabling them to drive 1.8-V logic.

High-speed comparator cuts delays to 2.9 ns – [Link]

Buck-boost converter works with dual inputs

3118by Susan Nordyk @ edn.com

A synchronous buck-boost DC/DC converter that accepts 2.2 V to 18 V on each of its two inputs, the LTC3118 from Linear Technology enables high-efficiency operation from either input source to a programmable output voltage above, below, or equal to the inputs. Its dual-input capability is suitable for applications that employ batteries or supercaps as secondary or backup inputs, as well as those that use multiple sources, such as a wall adapter and Li-Ion cells.

The current-mode converter has a fixed 1.2-MHz switching frequency and furnishes up to 2 A of continuous output current from a wide range of power sources, including single or multiple-cell batteries, supercapacitor stacks, and wall adapters. Output voltage is programmable from 2 V to 18 V. Integrated low-loss PowerPath control is also user-programmable to prioritize and seamlessly transition between inputs, while maintaining output voltage regulation.

Buck-boost converter works with dual inputs – [Link]