Dual output synchronous step-down controller produces 1.5-V output from up to 24-V input at 2-MHz
November 15, 2011 // Paul Buckley
Linear Technology Corporation has introduced a high frequency controlled on-time dual output synchronous step-down DC/DC controller with differential output voltage sensing and clock synchronization. The controlled on-time, valley current-mode architecture enables a fast transient response by increasing its operating frequency during a transient event, enabling the LTC3838 to recover from a large load step in only a few clock cycles.
The operating frequency is selectable from 200 kHz to 2 MHz or can be synchronized to an external clock. A low 30 ns minimum on-time allows for a high step-down ratio power supply at high operating frequencies.
The LTC3838 operates over a 4.5 V to 38 V input voltage range, encompassing a wide variety of applications including most intermediate bus voltages. Strong onboard N-channel MOSFET gate drivers allow the use of high power external MOSFETs for output currents up to 25 A per channel, at output voltages ranging from 0.6 V to 5.5 V, making it ideal for point-of-load requirements.
The LTC3838’s differential amplifier provides true remote output voltage sensing of both the positive and negative terminals, enabling high accuracy regulation independent of board IR losses (up to ±500 mV). The output current is monitored by sensing the voltage drop across the output inductor (DCR) for highest efficiency or by using a sense resistor for extra precision. Additional features include an onboard bias voltage LDO, soft-start or tracking, adjustable current limit, overvoltage protection, current limit foldback and external V CC control.
The LTC3838 offers superior total regulation accuracy and is specified to account for all error sources including line, load and differential sensing. The LTC3838 total differential output voltage accuracy is ±0.25% at 25°C, ±0.67% from 0 to 85°C and ±1% maximum DC error over the full -40 to 125°C operating junction temperature range.
More information about the LTC3838 synchronous step-down DC/DC controller at www.linear.com/product/LTC3838
SMIC to report Tunnel-FET extension to CMOS
October 08, 2015
Chinese foundry Semiconductor Manufacturing International Corp. has manufactured complementary Tunnel FETs (C-TFETs) that ...
Moroccan camera packager to exit market, auction equipment
Dresden's chilling evening stroll
Sony acquires SoftKinetic for ranging technology
Next-gen ADAS focuses on urban driving
Chip market decline accelerated in August, says ESIA
October 08, 2015
The three-month average of global chip sales for August declined by 3 percent in comparison with the same month a year ago, ...
Standardisation of vehicle data makes progress
NFC concrete slabs for a smart city
Update: IMEC, Cadence tape out first 5nm test chip
- Determine Balancing Current for the LTC3305 Lead-Acid Battery Balancer
- 3 Ways to Simplify Medical Device Testing
- Thread Networking Protocol Simplifies Connecting “Things” in the Home and Beyond
- High Voltage CMOS Amplifier Enables High Impedance Sensing with a Single IC
InterviewMEMS platforms are way to go, says Bosch's Finkbeiner
In the two years since we last interviewed Stefan Finkbeiner, CEO of Bosch Sensortec, the company has taken over from STMicroelectronics as the leading global supplier of MEMS components. Here he explains ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, LabNation is giving away three of its SmartScope open source USB oscilloscopes, worth 229 Euros each, for EETimes Europe's readers to win.
Successfully funded through Kickstarter last year, the SmartScope is claimed to be the world's first test equipment designed to run on multiple operating systems and platforms such as smartphones, tablets and PCs. It is powered directly from... MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.