Tiny Boost Regulators Offer Output Disconnect

Linear Technology’s LTC3539/-2 are 1-MHz/2-MHz, current-mode, synchronous boost converters with output disconnect and integrated soft-start. Their internal 2-A switches can deliver outputs as high as 5.25 V from an input as low as 0.70 V at start-up, (0.5 V when running).

Device type: synchronous boost regulator
Input voltage range: 0.7 V (0.5 V after startup) up to 5 V
Output voltage range: 1.5 V to 5.25 V
Output current: 900 mA cont. at 3.3 V with operation from two alkaline cells
Switching frequency: 1 MHz (LTC3539) or 2 MHz (LTC3539-2)
Features: output disconnect feature (allows the output to be completely discharged in shutdown), inrush current limiting, efficiencies up to 94%, 10-µA quiescent current in burst mode, anti-ringing control, short-circuit protection, soft-start, and thermal protection
Operating temperature range: -40ºC to 125ºC
Packaging: 8-lead, 2-mm x 3-mm DFN packages
RoHS compliant? yes
Target applications: Li-ion/Li-polymer or single/multicell alkaline/NiMH applications
Pricing: starts at $2.50 each in quantities of 1000
Availability: available now
Data sheet? yes, see www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1042,C1031,C1060,P80945,D26334