2.7V to 38V/500 mA low noise buck-boost charge pump

2.7V to 38V/500 mA low noise buck-boost charge pump

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By Graham Prophet

Internal circuitry automatically selects a conversion ratio of 2:1, 1:1 or 1:2 to optimize efficiency as input voltage and load conditions vary. Low operating current (20 μA regulating with no load, 1.5 μA in shutdown), low EMI switching and low external device count (three small ceramic capacitors and no inductors) suit the LTC3246 for noise-sensitive space constrained automotive applications such as ECU/CAN transceiver supplies, as well as industrial housekeeping supplies and efficient low power 12V to 5V conversion.


The LTC3246’s switched capacitor architecture with inherent soft switching provides lower radiated noise and EMI compared with conventional switching regulators. Timing control for the reset timeout and the windowed watchdog timeout can be adjusted using external capacitors on the RT and WT pins, or fixed internally via pin strapping. The accurate threshold of the reset input can be used for additional supply monitoring, or can be configured as a pushbutton reset. Other features include stability with ceramic capacitors, foldback current limiting to prevent excessive current flow during start-up, plus short-circuit and thermal protection.


The LTC3246 is available in a compact, thermally enhanced 16-lead MSOP package, in several operating temperature range variants. Pricing starts at $3.25 (1000) for the E grade.


Analog Devices/Linear Technology;


Next page; feature listing…

Summary of Features: LTC3246


2.7V–38V Operating Range (42V Abs Max)

IQ = 20µA Operating; 1.5µA in Shutdown

Multimode Buck-Boost Charge Pump (2:1, 1:1, 1:2) with Automatic Mode Switching

12V to 5V Efficiency = 81%

IOUT Up to 500mA

VOUT: Fixed 3.3V, 5V or Adjustable (2.5V to 5V)

Ultralow EMI

Engineered for Diagnostic Coverage in ISO 26262 Systems

Overtemperature & Short-Circuit Protection

Operating Junction Temperature: 150°C Max

POR/Watchdog Controller with External Timing Control

Thermally Enhanced 16-Lead MSOP Package



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