Bandgap reference current source for generating a reference current (I.sub.REF) having: at least two bipolar transistors (T.sub.1, T.sub.2), the base terminals (B.sub.1, B.sub.2) of which are interconnected and connected to a fixed reference potential, the collector terminals (C.sub.1, C.sub.2) of which are connected to a collector current ratio setting circuit (15, 16), which sets a specific current ratio (m) between the two collector currents (I.sub.C1, I.sub.C2) flowing through the collector terminals (C.sub.1, C.sub.2), and the emitter terminals (E.sub.1, E.sub.2) of which are connected via a first resistor (R.sub.A) to a current node (13) which adds the emitter currents (I.sub.E1, I.sub.E2) flowing through the emitter terminals (E.sub.1, E.sub.2) to form a summation current (I.sub.SUM), which forms the reference current (I.sub.REF).