MAX8890

19-2075; Rev 2; 10/02 MAX8890 Integrated Cellular RF-Section Power-Management IC General Description The MAX8890 is a power-management IC intended for cellular handsets using a single lithium-ion (Li+) cell battery with input voltages from +2.5V to +5.5V. The IC contains three identical, low-noise, low-dropout (LDO) linear regulators to provide all of the supply voltage requirements for the RF portion of the handset. The first LDO is intended to power the transmitter, receiver, and synthesizer. The second LDO is intended to power the TCXO, and high-power voltage-controlled oscillators (VCOs). The third LDO is intended to power the UHF offset VCO. Each LDO has its own individual enable (ON/OFF) control to maximize design flexibility. The reference is powered on if any of the enable inputs (EN1, EN2, EN3) are logic high. The high-accuracy output voltage of each LDO is preset at an internally trimmed voltage (1.8V to 3.3V in 50mV increments). Each LDO is capable of supplying 100mA with...