60V Fault-Protected, 50mA Step-Down Charge Pump Provides Regulated Output with Input Current Doubling
The LTC3255 operates either as a general purpose step-down charge pump with 2:1 or 1:1 conversion ratios, or it can operate as a current doubling shunt regulator. In normal mode, the conversion ratio is chosen based on VIN, VOUT, and load conditions, and switching between conversion modes is automatic. In shunt mode, the device is forced into 2:1 mode, enabling the LTC3255 to provide a regulated output voltage from a current source input with nearly two times the input current available at the load. For example, this feature enables a 4mA current loop to power a 7.4mA load continuously with a 3.3V regulated output voltage. The LTC3255 withstands reverse-polarity input supplies down to -52V and output short-circuit without damage. Safety features, including an output current limit and over-temperature protection further enhance robustness.
The LTC3255 is available in a low-profile (0.75mm) 3mm x 3mm 10-lead DFN and a 10-lead MSOP package, both with a backside metal pad for enhanced thermal performance. The E- and I-grade operating junction temperature is -40°C to +125°C. The H grade offers -40°C to +150°C operation and the high reliability MP grade is specified from -55°C to +150°C. 1000-piece pricing for the E grade starts at $2.30 each, and devices are available from stock. For more information, www.linear.com/product/LTC3255.
Summary of Features: LTC3255
- Input Voltage Range: 4V to 48V
- Adjustable Regulated Output: 2.4V to 12.5V, 50mA Maximum
- 16µA Quiescent Current in Regulation at No Load
- Reverse-Polarity Input Protection to -52V
- Multimode Charge Pump (2:1, 1:1) with Automatic Mode Switching Maintains Regulation over Wide VIN Range
- Input Voltage Shunt Mode for Current-Fed Applications
- Power Good Output
- Over-Temperature & Short-Circuit Protection
- Operating Junction Temperature: 150°C Maximum
- Thermally Enhanced 10-Lead MSOP & 10-Lead (3mm × 3mm) DFN Packages
LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and µModule are registered trademarks of Linear Technology Corp. All other trademarks are the property of their respective owners.
LINEAR TECHNOLOGY GmbH
Linear Technology Corporation, a member of the S&P 500, has been designing, manufacturing and marketing a broad line of high performance analog integrated circuits for major companies worldwide for over three decades. The Company's products provide an essential bridge between our analog world and the digital electronics in communications, networking, industrial, automotive, computer, medical, instrumentation, consumer, and military and aerospace systems. Linear Technology produces power management, data conversion, signal conditioning, RF and interface ICs, µModule® subsystems, and wireless sensor network products. For more information, visit www.linear.com.
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