Charge-pump rail generator for low-power bipolar supplies
The MAX861IUA+ is a ratiometric charge-pump IC from Analog Devices that produces either a negative rail equal to -Vin or a doubled positive rail of 2×Vin from a single input voltage between 1.5 V and 5.5 V. Rated for 50 mA continuous output, it suits low-power analog front-ends, op-amp supply rails, or sensor bias circuits where a second polarity is needed without a separate DC-DC converter. Three selectable switching frequencies — 13 kHz, 100 kHz, or 250 kHz — let the designer trade output ripple amplitude against external capacitor size; lower frequency reduces switching losses, higher frequency shrinks the charge-pump capacitors.
Package, footprint, and handling for rework and assembly
Housed in an 8-uMAX/uSOP package (also described as 8-TSSOP/8-MSOP, 0.118-inch body width, 3.00 mm), the MAX861IUA+ occupies a small board footprint and is supplied in Tube format — not tape-and-reel, so plan for manual placement or tube-fed pick-and-place if the line is set up for reels. Operating temperature range of -25°C to +85°C covers most indoor, telecom, and industrial environments but does not extend to automotive under-hood or extended military grades.
Compliance and lifecycle status for procurement planning
ROHS3 compliant, with no RoHS exemptions that would restrict EU or global shipment. No additional compliance documentation (REACH, UL, IEC) is listed in the available record.