LINEAR Manuals

LT1510/LT1510-5 is a simple and efficient solution for fast-charging modern rechargeable batteries including lithium-ion (Li-Ion), nickel-metal-hydride (NiMH)*, and nickel-cadmium (NiCd)* that require constant-current and/or constant-voltage charging. It features an internal switch capable of delivering 1.5A DC current (2A peak current). The charging current programming is simplified with a 0.1Ω onboard current sense resistor, requiring only one resistor or a programming current from a DAC to set the full charging current (1.5A) within 5% accuracy. With 0.5% reference voltage accuracy, the LT1510 meets the critical constant-voltage charging requirement for lithium cells. It can charge batteries ranging from 2V to 20V, and does not require ground sensing of current, allowing the battery's negative terminal to be tied directly to ground. The chip operates with a saturating switch running at 200kHz (500kHz for LT1510-5), providing high charging efficiency and small inductor size. A blocking diode is not needed between the chip and the battery as the chip goes into sleep mode and drains only 3µA when the wall adaptor is unplugged. Soft start and shutdown features are also included.

The LTC3406 is a high efficiency synchronous buck regulator that uses a constant frequency, current mode architecture. The supply current during operation is only 20µA and drops to ≤1µA in shutdown. The input voltage range is 2.5V to 5.5V and the output current is 600mA.

The document describes the features and characteristics of the Siliconix J500 series products, including wide current range, no biasing required, maximum operating temperature, etc.

The SD5000/5400 series of monolithic switches features four individual double-diffused enhancement-mode MOSFETs built on a common substrate. These bidirectional devices provide low on-resistance and low interelectrode capacitances to minimize insertion loss and crosstalk. Built on Siliconix’ proprietary DMOS process, the SD5000/5400 series utilizes lateral construction to achieve low capacitance and ultra-fast switching speeds. For manufacturing reliability, these devices feature poly-silicon gates protected by Zener diodes.

The LTC1391 is a high performance CMOS 8-to-1 analog multiplexer. It features a serial digital interface that allows several LTC1391s to be daisy-chained together, increasing the number of MUX channels available using a single digital port. The LTC1391 features a typical RON of 45Ω, a typical switch leakage of 50pA and guaranteed break-before-make operation. Charge injection is ±10pC maximum. All digital inputs are TTL and CMOS compatible when operated from single or dual supplies. The inputs can withstand 100mA fault current. The LTC1391 is available in 16-pin PDIP, SSOP and narrow SO packages. For applications requiring 2-way serial data transmission, see the LTC1390 data sheet.

The LTC ®2238/LTC2237/LTC2236 are 10-bit 65Msps/ 40Msps/25Msps, low power 3V A/D converters designed for digitizing high frequency, wide dynamic range signals.

The LTC1422 is a hot swap controller from LTC that allows the board to be safely inserted and removed from a live backplane. It has a programmable delay system reset output, a programmable electronic circuit breaker, a user-programmable supply voltage power-up rate, a high side driver for an external N-channel FET, controls supply voltages from 2.7V to 12V, undervoltage lockout and a soft reset input.

The LT1797 is a unity-gain stable 10MHz op amp available in the small SOT-23 package that operates on all single and split supplies with a total voltage of 2.7V to 12V.

The LT1765 is a 1.25MHz monolithic buck switching regulator suitable for applications such as DSL modems, portable computers, regulated wall adapters, battery-powered systems, and distributed power. It features high efficiency, wide operating voltage range, low shutdown current, and synchronization.

The LT®1764 is a low dropout regulator optimized for fast transient response. The device is capable of supplying 3A of output current with a dropout voltage of 340mV. Oper- ating quiescent current is 1mA, dropping to <1µA in shutdown. Quiescent current is well controlled; it does not rise in dropout as it does with many other regulators. In addition to fast transient response, the LT1764 has very low output voltage noise which makes the device ideal for sensitive RF supply applications. Output voltage range is from 1.21V to 20V. The LT1764 regulators are stable with output capacitors as low as 10µF. Internal protection circuitry includes reverse battery pro- tection, current limiting, thermal limiting and reverse cur- rent protection. The device is available in fixed output voltages of 1.5V, 1.8V, 2.5V, 3.3V and as an adjustable device with a 1.21V reference voltage. The LT1764 regu- lators are available in 5-lead

LT1584/LT1585/LT1587 7A, 4.6A, 3A low dropout fast response positive regulators adjustable and fixed voltage

The LT ® 1500 is an adaptive-frequency current mode step-up switching regulator with an internal power switch that is rated up to 700mA. In contrast to pulse skipping switching regulators, the LT1500 uses a current mode topology that provides lower noise operation and im- proved efficiency. Only at very light loads is Burst Mode TM activated to give high efficiency and micropower opera- tion. High switching frequency (up to 500kHz) allows very small inductors to be used, along with ceramic capacitors if desired. The LT1500 operates with input voltages from 1.8V to 15V and has only 200µA operating current dropping to 8µA in shutdown. A low-battery comparator is included which stays alive in shutdown. A second output feedback pin with negative polarity allows negative output voltages to be regulated when the switcher is connected up as a Cuk or a flyback converter. Two package types are available. The LT1500 comes in a 14-pin SO package, with two options available for fixed output (3.3V or 5V) or adjustable operation. A reduced feature part, the LT1501, comes in the smaller 8-pin SO package with internal frequency compensation. It is also available in adjustable and fixed output voltage versions.