New 22/40-V Input Power Modules

Exar Corp. recently announced additions to its family of synchronous step-down power modules with input voltage up to 40 V: XR79103, XR79106, XR79203, and XR79206. The XR79103 and XR79106 operate from a 4.5-to-22-V input supply, delivering a regulated output adjustable between 0.6  and 5.5 V. With a 40-V maximum input voltage, the XR79203 and XR79206 add the ability to convert from loosely regulated 24 VDC, rectified 18 VAC and 24 VAC sources. The output voltage can be set from 0.6 to 13.2 V.Exar EX064-1

With Exar’s emulated current mode constant on-time (COT) control, the power modules have fast transient response of conventional COT control loops and provide excellent line and load regulation performance. The modules offer a host of supervisory and protection features for proper sequencing, safe operation under abnormal operating conditions, and light load operation. The combination of wide input voltage range, a thermally efficient package, tight regulation accuracy, and small size makes the power modules well suited for communications, drones, remote vehicles, and a variety of other applications.

The XR79103 (6 mm × 6 mm × 4 mm), XR79106 (8 mm × 8 mm × 4 mm), XR79203 (8 mm × 8 mm × 4 mm) and XR79206 (10 mm × 10 mm × 4 mm) are available in RoHS-compliant, green/halogen free, space-saving QFN packages. Prices start at $4.25, $5.40, $8.50n and $9.95, respectively, in quantities of 1,000.

Source: Exar Corp.

New RS-232 Transceiver Family with Adjustable Low-Voltage Interface

Exar Corp. recently launched a new family of RS-232 (EIA/TIA-232) transceivers designed to operate from 3- to 5.5-V supplies. The XR32220, XR32430, and XR32431 transceivers include an adjustable low-voltage logic interface that simplifies their use in low- and multi-voltage systems.Exar EX051_XR32220

The XR32220 and XR32431 feature a low-voltage logic pin (VL) for adjusting the transceiver’s logic output levels and input thresholds for compatibility with lower supply voltage logic. The VL range is 1.65 to 5.5 V. The adjustable low-voltage interface eliminates the need for a level shifter/translator between the transceiver and UART or microcontroller.

Features and specs:

  • Wide 3- to 5-V supply operation
  • 1.65- to 5.5-V logic interface VL pin (XR32220, XR32431)
  • Auto on-line circuitry automatically wakes up from a 1-µA shutdown
  • Regulated charge pump yields stable RS-232 outputs regardless of VCC variations
  • XR32220: 250 kbps minimum transmission rate
  • XR32430, XR32431: 250 kbps/460 kbps/1 Mbps minimum transmission rate

The XR32220, XR32430, and XR32431 are available in RoHS-compliant, green/halogen free, space-saving 4 mm × 4 mm QFN (XR32220) and 5 mm × 5 mm QFN (XR32430/31) packages. They cost from $0.74 to $0.94 in 1,000-piece quantities. Demoboards and samples are available at http://www.exar.com/transceivers.

 

Source: Exar Corp.

Sensor Interface Connects Multiple Sensors to MCUs or FPGAs

Exar Corp. has announced the XR10910, a new sensor interface analog front end (AFE) for the calibration of sensor outputs. The XR10910 features an onboard 16:1 differential multiplexer, offset correction DAC, programmable gain instrumentation amplifier, and voltage reference. In addition, it provides 14-bit signal path linearity and is designed to connect multiple bridge sensors to a microcontroller or FPGA with an embedded ADC.EX041_Exar

Operating from from 2.7- to 5-V supplies, the XR10910 has a wide digital supply range of 1.8 to 5 V. It typically consumes 457 µA of supply current and offers a sleep mode for reducing the supply current to 45 µA.

The XR10910 is available in a 6 mm × 6 mm QFN package. Pricing starts at $8.10 each for 1,000-piece quantities.

Source: Exar Corp.

Quad Channel DPWM Step-Down Controller

Exar Corp. has introduced the XR77128, a universal PMIC that drives up to four independently controlled external DrMOS power stages at currents greater than 40 A for the latest 64-bit ARM processors, FPGAs, DSPs and ASICs. DrMOS technology is quickly growing in popularity in telecom and networking applications. These same applications find value in Exar’s Programmable Power technology which allows low component count, rapid development, easy system integration, dynamic control and telemetry. Depending on output current requirements, each output can be independently configured to directly drive external MOSFETs or DrMOS power stages.EX045_XR77128

The XR77128 is quickly configured to power nearly any FPGA, SoC, or DSP system through the use of Exar’s design tool, PowerArchitect, and programmed through an I²C-based SMBus compliant serial interface. It can also monitor and dynamically control and configure the power system through the same I²C interface. Five configurable GPIOs allow for fast system integration for fault reporting and status or for sequencing control.  A new Arduino-based development platform allows software engineers to begin code development for telemetry and dynamic control long before their hardware is available.

The XR77128 is available in a RoHS-compliant, green/halogen free space-saving 7 mm × 7 mm TQFN. It costs $7.75 in 1000-piece quantities.

Source: Exar Corp.

Quad Output Programmable Universal PMIC

Exar Corp. recently announced the XR77129, a quad output programmable universal PMIC with an input operating voltage range of 6 to 40 V. Its patented control architecture is well suited for 40-V inputs using a 17-bit wide PID voltage mode VIN feed forward architecture. This controller offers a single input, quad output, step-down switching regulator controller with integrated gate drivers and dual LDO outputs. It can also monitor and dynamically control and configure the power system through an I2C interface. Five configurable GPIOs allow for fast system integration for fault reporting and status or for sequencing control.Exar-EX039_xr77129

The XR77129 can be configured to power nearly any FPGA, SoC, or DSP system with the use of Exar’s PowerArchitect and programmed through an I²C-based SMBus compliant serial interface. PowerArchitect 5.2 has been upgraded to support the additional capabilities of the XR77129 including output voltage ranges beyond the native 0.6 to 5.5 V with the use of external feedback resistors. The XR77129 wide input voltage range, low quiescent current of 450 µA (standby) and 4 mA (operating) make it a logical choice for a wide range of systems, including 18 to 36 VDC, 24 VDC or rectified AC systems used in the industrial automation and embedded applications.

The XR77129 is available now in an RoHS-compliant, green/halogen-free, space-saving 7 mm × 7 mm TQFN. It costs $9.95 in 1,000-piece quantities..

Summary of features:
•       6 to 40 V input voltage
•       Quad channel step-down controller
•       Digital PWM 105 kHz to 1.23 MHz operation
•       SMBus-compliant I²C interface
•       Supported by PowerArchitect 5.2 or later

Source: Exar

Small High-Current Power Modules

 

Exar Corp. recently announced the 10-A XR79110 and 15-A XR79115 single-output, synchronous step-down power modules. The modules will be available in mid-November in RoHS-compliant, green/halogen-free, QFN packages.

In a product release, Exar noted that “both devices provide easy to use, fully integrated power converters including MOSFETs, inductors, and internal input and output capacitors.”

The modules come in compact 10 x 10 x 4 mm and 12 x 12 x 4 mm footprints, respectively. The XR79110 and XR79115 offer versatility to convert from common input voltages such as 5, 12, and 19 V.

Both modules feature Exar’s emulated current-mode COT control scheme. The COT control loop enables operation with ceramic output capacitors and eliminates loop compensation components. According to Exar documentation, tthe output voltage can be set from 0.6 to 18 V and with exceptional full range 0.1% line regulation and 1% output accuracy over full temperature range.

The XR79110 and XR79115 are priced at $8.95 and $10.95, respectively, in 1,000-piece quantities.

Source: Exar Corp.