Charge pump with a ratiometric secondary rail
The TPS60313DGSR is a charge-pump-based step-up converter that generates two fixed outputs from a single low-voltage input: the primary rail is 3 V, and the secondary rail tracks the input voltage at 2×Vin (ratiometric). Input range runs from 0.9 V up to 1.8 V, so a single alkaline or NiMH cell is enough to start the converter — the 700 kHz switching frequency keeps external capacitors small. Output current is rated 40 mA on the 3 V rail and 20 mA on the 2×Vin rail; the dual-output topology means a single IC powers both a 3 V logic rail and a ratiometric bias rail without a second converter.
Package, temperature, and board-fit
Housed in a 10-VSSOP (MSOP-10, 3.00 mm width), the part is a surface-mount charge pump that fits into compact, low-profile designs where inductor-based converters are too tall or generate too much EMI. The non-synchronous architecture (no external Schottky needed) simplifies the BOM; the fixed output configuration means no feedback resistor divider on the board.