LT1944-1EMS#PBF

LT1944-1EMS#PBF is a dual micropower step-up DC/DC converter. One converter is designed with a 100mA current limit and a 400ns off-time, while the other has a 175mA current limit and a 1.5µs off-time. The 1.5µs off-time converter is ideal for generating an output voltage close to the input voltage, such as a Li-Ion to 5V converter or a two-cell to 3.3V converter. With an input voltage range of 1.2V to 15V, the LT1944-1 suits a wide variety of applications. Both converters feature a quiescent current of only 20µA at no load, which reduces further to 0.5µA in shutdown. A current-limited, fixed off-time control scheme conserves operating current, resulting in high efficiency over a broad range of load current. Tiny, low-profile inductors and capacitors can be used to minimize footprint and cost in space-conscious portable applications. Applications include small TFT LCD panels, handheld computers, battery backup systems, and digital cameras.

• Quiescent current (each switcher) is 20µA typical at (not switching, TA = 25°C)
• Switch VCESAT is 85mV typical at (ISW = 70mA, TA = 25°C)
• FB pin bias current is 30nA typical at (VFB = 1.23V)
• Switch leakage current is 0.01µA typical at (switch off, VSW = 5V, TA = 25°C)
• FB comparator hysteresis is 8mV typical at (TA = 25°C)
• FB voltage line regulation is 0.05%/V typical at (1.2V < VIN < 12V, TA = 25°C)
• Active-low SHDN pin current is 2µA typical at (VSHDN = 1.2V, TA = 25°C)
• Operating temperature range from -40°C to 85°C
• 10-lead plastic MSOP package

Notes

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