AN1337 Optimizing Battery Life in DC Boost Converters Using MCP1640
MCP1640 Datasheet. 0.65V Start-up Synchronous Boost Regulator with True Output Disconnect or Input/Output Bypass Option
|At 12 January 2015, 21:21:09 user 123 wrote: [reply @ 123]|
VFB is always 1.12V -> should be corrected to 1.21 V
Data Sheet MCP 1640
At 9 July 2013, 16:29:40 user Angel G. wrote: [reply @ Angel G.]
I experimented today with a MCp1640 and also got around 140ma over range of Vin=2.7 .. 4.5V.
Divider is set so the output to be 5.5V, but it can't get over 4V.
I think there's a bug in the chip, because: When I disconnected the load (a resistor) & powered up w/o load. It managed to hold 5.5V with over 200ma to the resistor. So...
At 15 February 2013, 22:11:29 user Giorgos Lazaridis wrote: [reply @ Giorgos Lazaridis]
@Ben Choy It is designed for 3.3 and 5 volts, but i'm quite sure it can do well at 1.2 as well. Or you can use 2 diodes to drop with little power loss.
At 14 February 2013, 4:35:19 user Ben Choy wrote: [reply @ Ben Choy]
Just wonder, can this be adopted as a laser LED PSU, since I have a need to drive an laser LED on/off with logic voltage. The laser should take about 200mA to 300mA @ 1.2V.
HOT in heaven!