DESCRIPTION
The LTM®8027 is a complete 4A, DC/DC step-down power supply. Included in the package are the switching controller, power switches, inductor and all support components. Operating over an input voltage range of 4.5V to 60V (7.5V minimum voltage to start), the LTM8027 supports output voltages up to 24V, and a switching frequency range of 100kHz to 500kHz, each set by a single resistor. Only the bulk input and output fi lter capacitors are needed to fi nish the design.
The low profi le package (4.32mm) enables utilization of unused space on the bottom of PC boards for high density point of load regulation. A built-in soft-start timer is adjustable with a small capacitor.
The LTM8027 is packaged in a thermally enhanced, compact (15mm × 15mm) and low profi le (4.32mm) over-molded land grid array (LGA) package suitable for automated assembly by standard surface mount equipment. The LTM8027 is Pb-free and RoHS compliant.

FEATURES
*Complete Switch Mode Power Supply
*Wide Input Voltage Range: 4.5V to 60V (7.5V Minimum Voltage to Start)
*Wide Output Voltage Range: 2.5V to 24V (See Table 2)
*4A Output Current
*Programmable Soft-Start
*10μA Shutdown Supply Current
*Selectable Switching Frequency Current Mode Control
*Up to 95% Effi ciency
*Pb-Free (e4) RoHS Compliant Package with Gold Pad Finish
*Tiny, Low Profi le (15mm × 15mm × 4.32mm) Surface Mount LGA Package

APPLICATIONS
*12V and 42V Automotive and Heavy Equipment
*48V Telecom Power Supplies
*Avionics and Industrial Control Systems
*Distributed Power Converters

LTM8027EVPBF, LTM8027IVPBF, LTM8027MPVPBF, LTM8027EV, LTM8027IV

DESCRIPTION
The LTM®9003 is a 12-bit digital pre-distortion receiver subsystem for the transmit path of cellular basestations. Utilizing an integrated system in a package (SiP) tech-nology, it includes a downconverting mixer, wideband fi lter and analog-to-digital converter (ADC). The system is tuned for an intermediate frequency (IF) of 184MHz and a signal bandwidth of up to 125MHz. The 12-bit ADC samples at rates up to 250Msps. Contact Linear Technology regarding customization.
The high signal level downconverting active mixer is optimized for high linearity, wide dynamic range IF sampling applications. It includes a differential LO buffer amplifi er driving a double-balanced mixer. Broadband, integrated transformers on the RF and LO inputs provide single ended 50Ω interfaces. The RF and LO inputs are internally matched to 50Ω from 1.1GHz to 1.8GHz.
The CLK input controls converter operation and may be driven differentially or single-ended. An optional clock duty cycle stabilizer allows high performance at full speed for a wide range of clock duty cycles.

FEATURES
*Fully Integrated Receiver Subsystem for Digital Pre-Distortion Applications
*Down-Converting Mixer with Wide RF Frequency Range: 400MHz to 3.8GHz
*125MHz Wide Bandpass Filter, <0.5dB Passband Ripple
*Low Power ADC with Up to 12-Bit Resolution, 250Msps Sample Rate
*–145.5dBm/Hz Input Noise Floor, 25.8dBm IIP3
*1.5W Total Power Consumption
*50Ω Single-Ended RF and LO Ports
*Internal Bypass Capacitance, No External Components
*ADC Clock Duty Cycle Stabilizer
*11.25mm × 15mm LGA package

APPLICATIONS
*Transmit Observation Path Receivers
*Digital Pre-Distortion (DPD) Receivers
*Wideband Receiver
*Wideband Instrumentation

LTM9003CV-AAPBF, LTM9003IV-AAPBF, LTM9003CV-ABPBF, LTM9003IV-ABPBF

DESCRIPTION
The LT®4356 surge stopper protects loads from high voltage transients. It regulates the output during an overvoltage event, such as load dump in automobiles, by controlling the gate of an external N-channel MOSFET. The output is limited to a safe value thereby allowing the loads to continue functioning. The LT4356MP also monitors the voltage drop between the VCC and SNS pins to protect against overcurrent faults. An internal amplifi er limits the current sense voltage to 50mV. In either fault condition, a timer is started inversely proportional to MOSFET stress. If the timer expires, the FLT pin pulls low to warn of an impending power-down. If the condition persists, the MOSFET is turned off. After a cooldown period, the GATE pin pulls up turning on the MOSFET again.
The spare amplifi er may be used as a voltage detection comparator or as a linear regulator controller driving an external PNP pass transistor.
Back-to-back FETs can be used in lieu of a Schottky diode for reverse input protection, reducing voltage drop and power loss. A shutdown pin reduces the quiescent current to less than 7μA during shutdown for the LT4356-1 and 60μA for the LT4356-2 while keeping the reference and auxiliary amplifi er functioning.

FEATURES
*Stops High Voltage Surges
*Adjustable Output Clamp Voltage
*Overcurrent Protection
*Wide Operation Range: 4V to 80V
*Reverse Input Protection to –60V
*Low 7μA Shutdown Current, LT4356-1
*Adjustable Fault Timer
*Controls N-channel MOSFET
*Shutdown Pin Withstands –60V to 100V
*Fault Output Indication
*Guaranteed Operation –55°C to 125°C
*Spare Amplifi er for Level Detection Comparator or Linear Regulator Controller
*Available in 10-Pin MSOP or 16-Pin SO Packages

APPLICATIONS
*Automotive/Avionic Surge Protection
*Hot Swap/Live Insertion
*High Side Switch for Battery Powered Systems
*Intrinsic Safety Applications

LT4356MP-2, LT4356MPMS-1, LT4356MPS-1, LT4356MPS-2

DESCRIPTION
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 LTC2238/LTC2237/LTC2236 are perfect for demanding imaging and communications applications with AC performance that includes 61.8dB SNR and 85dB SFDR for signals at the Nyquist frequency.
DC specs include ±0.1LSB INL (typ), ±0.05LSB DNL (typ) and ±0.5LSB INL, ±0.5LSB DNL over temperature. The transition noise is a low 0.07LSBRMS.
A single 3V supply allows low power operation. A separate output supply allows the outputs to drive 0.5V to 3.6V logic.
A single-ended CLK input controls converter operation. An optional clock duty cycle stabilizer allows high performance at full speed for a wide range of clock duty cycles.

FEATURES
*Sample Rate: 65Msps/40Msps/25Msps
*Single 3V Supply (2.7V to 3.4V)
*Low Power: 205mW/120mW/75mW
*61.8dB SNR
*85dB SFDR
*No Missing Codes
*Flexible Input: 1VP-P to 2VP-P Range
*575MHz Full Power Bandwidth S/H
*Clock Duty Cycle Stabilizer
*Shutdown and Nap Modes
*Pin Compatible Family:
-125Msps: LTC2251 (10-Bit), LTC2253 (12-Bit)
-105Msps: LTC2250 (10-Bit), LTC2252 (12-Bit)
-80Msps: LTC2239 (10-Bit), LTC2229 (12-Bit)
-65Msps: LTC2238 (10-Bit), LTC2228 (12-Bit)
-40Msps: LTC2237 (10-Bit), LTC2227 (12-Bit)
-25Msps: LTC2236 (10-Bit), LTC2226 (12-Bit)
*32-Pin (5mm × 5mm) QFN Package

APPLICATIOUNS
*Wireless and Wired Broadband Communication
*Imaging Systems
*Ultrasound
*Spectral Analysis
*Portable Instrumentation

LTC2238CUH, LTC2238IUH, LTC2237CUH, LTC2237IUH, LTC2236CUH, LTC2236IUH

DESCRIPTION
The LTC®4057 is a constant-current/constant-voltage linear charger for single-cell lithium-ion batteries. Its ThinSOTTM package and low external component count make the LTC4057 especially well suited for portable applications. Furthermore, the LTC4057 is specifically designed to work within USB power specifications.
No external sense resistor is needed and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback prevents overheating by regulating the charge current to limit the die temperature during high power operation or high ambient temperature conditions.
The charge voltage is preset at 4.2V and the charge current can be programmed externally with a single resistor.
When the input supply (wall adapter or USB supply) is removed, the LTC4057 automatically enters a low current state, dropping the battery drain current to less than 2mA. With power applied, the LTC4057 can be put into shutdown mode, reducing the supply current to 25mA.
For the standalone version (on-board charge termination) of the LTC4057, refer to the LTC4054.

FEATURES
*Programmable Charge Current up to 800mA
*No External MOSFET, Sense Resistor or Blocking Diode Required
*Constant-Current/Constant-Voltage Operation with Thermal Regulation Maximizes Charge Rate Without Risk of Overheating*
*Charges Single Cell Li-Ion Batteries Directly from USB Port
*Preset 4.2V Charge Voltage with ±1% Accuracy
*Current Monitor Pin for Charge Termination
*25mA Supply Current in Shutdown Mode
*Low Battery Charge Conditioning (Trickle Charging)
*Soft-Start Limits Inrush Current
*Available in a Low Profile (1mm) SOT-23 Package

APPLICATIONS
*Wireless PDAs
*Cellular Phones
*Portable Electronics

LTC4057ES5-4.2, LTC4057-4.2

DESCRIPTION
The LTC®3526L/LTC3526LB are synchronous, fixed frequency step-up DC/DC converters with output disconnect. Synchronous rectifi cation enables high effi ciency in the low profi le 2mm × 2mm DFN package. Battery life in single AA/AAA powered products is extended further with a 680mV start-up voltage and operation down to 500mV once started.
A switching frequency of 1MHz minimizes solution footprint by allowing the use of tiny, low profi le inductors and ceramic capacitors. The current mode PWM design is internally compensated, reducing external parts count. The LTC3526L features Burst Mode operation at light load conditions allowing it to maintain high effi ciency over a wide range of load. The LTC3526LB features fi xed frequency operation for low noise applications. Anti-ring circuitry reduces EMI by damping the inductor in discontinuous mode. Additional features include a low shutdown current of under 1μA and thermal shutdown.
The LTC3526L/LTC3526LB are housed in a 2mm × 2mm × 0.75mm DFN package.

FEATURES
*Delivers 3.3V at 100mA from a Single Alkaline/NiMH Cell or 3.3V at 200mA from Two Cells
*VIN Start-Up Voltage: 680mV
*1.5V to 5.25V VOUT Range
*Up to 94% Effi ciency
*Output Disconnect
*1MHz Fixed Frequency Operation
*VIN > VOUT Operation
*Integrated Soft-Start
*Current Mode Control with Internal Compensation
*Burst Mode® Operation with 9μA IQ (LTC3526L)
*Low Noise PWM Operation (LT3526LB)
*Internal Synchronous Rectifi er
*Logic Controlled Shutdown (IQ < 1μA)
*Anti-Ring Control
*Low Profi le (2mm × 2mm × 0.75mm) DFN-6 Package

APPLICATIONS
*Medical Instruments
*Noise Canceling Headphones
*Wireless Mice
*Bluetooth Headsets

LTC3526LB, LTC3526LEDC-PBF, LTC3526LBEDC-PBF, LTC3526LEDC-TRPBF

DESCRIPTION
The LTC®2355-12/LTC2355-14 are 12-bit/14-bit, 3.5Msps serial ADCs with differential inputs. The devices draw only 5.5mA from a single 3.3V supply and come in a tiny 10-lead MSOP package. A Sleep shutdown feature further reduces power consumption to 13µW. The combination of speed, low power and tiny package makes the LTC2355-12/LTC2355-14 suitable for high speed, portable applications.
The 80dB common mode rejection allows users to eliminate ground loops and common mode noise by measuring signals differentially from the source. The devices convert 0V to 2.5V unipolar inputs differentially.
The absolute voltage swing for AIN+ and AIN– extends from ground to the supply voltage.
The serial interface sends out the conversion results during the 16 clock cycles following a CONV rising edge for compatibility with standard serial interfaces. If two additional clock cycles for acquisition time are allowed after the data stream in between conversions, the full sampling rate of 3.5Msps can be achieved with a 63MHz clock.

FEATURES
*3.5Msps Conversion Rate
*74.2dB SINAD at 14-Bits, 71.1dB SINAD at 12-Bits
*Low Power Dissipation: 18mW
*3.3V Single Supply Operation
*2.5V Internal Bandgap Reference can be Overdriven
*3-Wire SPI-Compatible Serial Interface
*Sleep (13µW) Shutdown Mode
*Nap (4mW) Shutdown Mode
*80dB Common Mode Rejection
*0V to 2.5V Unipolar Input Range
*Tiny 10-Lead MSOP Package

APPLICATIOUS
*Communications
*Data Acquisition Systems
*Uninterrupted Power Supplies
*Multiphase Motor Control
*Multiplexed Data Acquisition
*RFID

LTC2355CMSE-12, LTC2355IMSE-12, LTC2355CMSE-14, LTC2355IMSE-14

Description
The LTC®1481 is an ultralow power differential line transceiver designed for data transmission standard RS485 applications. It will also meet the requirements of RS422.
The CMOS design offers significant power savings over its bipolar counterparts without sacrificing ruggedness against overload or ESD damage. Typical quiescent current is only
80mA while operating and less than 1mA in shutdown.
The driver and receiver feature three-state outputs, with the driver outputs maintaining high impedance over the entire common mode range. Excessive power dissipation caused by bus contention or faults is prevented by a thermal shutdown circuit which forces the driver outputs into a high impedance state. The receiver has a fail-safe feature which guarantees a high output state when the inputs are left open.
The LTC1481 is fully specified over the commercial and extended industrial temperature range and is available in 8-pin PDIP and SO packages.

Features
*Low Power: ICC = 120mA Max with Driver Disabled
*Drivers/Receivers Have ±10kV ESD Protection
*1mA Quiescent Current in Shutdown Mode
*High Speed: Up to 2.5Mbits/s Data Rate
*ICC = 500mA Max with Driver Enabled, No Load
*Single 5V Supply
*–7V to 12V Common Mode Range Permits ±7V Ground Difference Between Devices on the Data Line
*Thermal Shutdown Protection
*Power Up/Down Glitch-Free Driver Outputs Permit Live Insertion or Removal of Transceiver
*Driver Maintains High Impedance in Three-State or with the Power Off
*Up to 32 Transceivers on the Bus
*30ns Typical Driver Propagation Delays with 5ns Skew
*Pin Compatible with the LTC485

Applications
*Battery-Powered RS485/RS422 Applications
*Low Power RS485/RS422 Transceiver
*Level Translator

LTC1481CN8, LTC1481IN8, LTC1481CS8, LTC1481IS8

DESCRIPTION
The LT®1373 is a low supply current high frequency current mode switching regulator.
It can be operated in all standard switching configurations including boost, buck, flyback, forward, inverting and “Cuk.”
A 1.5A high efficiency switch is included on the die, along with all oscillator, control and protection circuitry.
All functions of the LT1373 are integrated into 8-pin SO/PDIP packages.
Compared to the 500kHz LT1372, which draws 4mA of quiescent current, the LT1373 switches at 250kHz, typically consumes only 1mA and has higher efficiency.
High frequency switching allows for small inductors to be used.
All surface mount components consume less than 0.6 square inch of board space.
New design techniques increase flexibility and maintain ease of use.
Switching is easily synchronized to an external logic level source.
A logic low on the shutdown pin reduces supply current to 12mA.
Unique error amplifier circuitry can regulate positive or negative output voltage while maintaining simple frequency compensation techniques.
Nonlinear error amplifier transconductance reduces output overshoot on start-up or overload recovery.
Oscillator frequency shifting protects external components during overload conditions.


FEATURES
*1mA IQ at 250kHz
*Uses Small Inductors: 15mH
*All Surface Mount Components
*Only 0.6 Square Inch of Board Space
*Low Minimum Supply Voltage: 2.7V
*Constant Frequency Current Mode
*Current Limited Power Switch: 1.5A
*Regulates Positive or Negative Outputs
*Shutdow*Supply Current: 12mA Typ
*Easy External Synchronization
*8-Pi*SO or PDIP Packages

APPLICATIOUS
*Boost Regulators
*CCFL Backlight Driver
*Laptop Computer Supplies
*Multiple Output Flyback Supplies
*Inverting Supplies

LT1373CN8
LT1373HVCN8
LT1373CS8

FEATURES
* Complete Switch Mode Power Supply
* Wide Input Voltage Range: 4.5V to 20V
* 10A DC, 14A Peak Output Current
* Parallel Two μModule™ DC/DC Converters for 20A Output Current
* 0.6V to 5V Output Voltage
* 1.5% Output Voltage Regulation
* Ultrafast Transient Response
* Current Mode Control
* Pb-Free (e4) RoHS Compliant Package with Gold- Pad Finish
* Up to 92% Effi ciency
* Programmable Soft-Start
* Output Overvoltage Protection
* Optional Short-Circuit Shutdown Timer
* Small Footprint, Low Profi le (15mm × 15mm × 2.8mm) Surface Mount LGA Package

APPLICATIONS
* Telecom and Networking Equipment
* Servers
* Industrial Equipment
* Point of Load Regulation

DESCRIPTION
The LTM®4600 is a complete 10A, DC/DC step down power supply. Included in the package are the switching controller, power FETs, inductor, and all support components.
Operating over an input voltage range of 4.5V to 20V, the LTM4600 supports an output voltage range of 0.6V to 5V, set by a single resistor. This high effi ciency design delivers 10A continuous current (14A peak), needing no heat sinks or airfl ow to meet power specifi cations. Only bulk input and output capacitors are needed to fi nish the design.
The low profi le package (2.8mm) enables utilization of unused space on the bottom of PC boards for high density point of load regulation. High switching frequency and an adaptive on-time current mode architecture enables a very fast transient response to line and load changes without sacrifi cing stability. Fault protection features include integrated overvoltage and short circuit protection with a defeatable shutdown timer. A built-in soft-start timer is adjustable with a small capacitor.
The LTM4600 is packaged in a thermally enhanced, compact (15mm × 15mm) and low profi le (2.8mm) over-molded Land Grid Array (LGA) package suitable for automated assembly by standard surface mount equipment. The LTM4600 is Pb-free and RoHS compliant.

LTM4600EV
LTM4600IV