1.5µA I, Step-Up DC-DC Converters in TSOT and µDFN

The MAX1722/MAX1723/MAX1724 compact, high-efficiency, step-up DC-DC converters are available in tiny, 5-pin TSOT packages. They feature an extremely low 1.5µA quiescent supply current to ensure the highest possible light-load efficiency. Optimized for operation from one to two alkaline or nickel-metal-hydride (NiMH) cells, or a single Li+ cell, these devices are ideal for applications where extremely low quiescent current and ultra-small size are critical.

Built-in synchronous rectification significantly improves efficiency and reduces size and cost by eliminating the need for an external Schottky diode. All three devices feature a 0.5Ω N-channel power switch. The MAX1722/MAX1724 also feature proprietary noise-reduction circuitry, which suppresses electromagnetic interference (EMI) caused by the inductor in many step-up applications. The family offers different combinations of fixed or adjustable outputs, shutdown, and EMI reduction (see Selector Guide).

Applications

* Digital Still Cameras * Low-Power Handheld Instruments * MP3 Players * Pagers * PDAs and Other Handheld Devices * Personal Medical Devices * Remote Controls * Remote Wireless Transmitters * Single-Cell Battery-Powered Devices

* Up to 90% Efficiency

* No External Diode or FETs Needed

* 1.5µA Quiescent Supply Current

* 0.1µA Logic-Controlled Shutdown

* ±1% Output Voltage Accuracy

* Fixed Output Voltage (MAX1724) or Adjustable Output Voltage (MAX1722/MAX1723)

* Up to 150mA Output Current

* 0.8V to 5.5V Input Voltage Range

* 0.91V Guaranteed Startup (MAX1722/MAX1724)

* Internal EMI Suppression (MAX1722/MAX1724)

* TSOT Package (0.9mm typ Height)

* µDFN Package (2mm x 2mm x 0.75mm)