L8401

UNISONIC TECHNOLOGIES CO., LTD L8401 LINEAR INTEGRATED CIRCUIT FET BIAS CONTROLLER  DESCRIPTION The UTC L8401 is designed to bias the MOSFETs that are commonly used in LNBs that can implies minimum external components requires.  FEATURES * Can Bias up to 4 FETs * Drain Current Adjustable by Two External Resistors. * Two Sets of Drain Current can be Setted.  ORDERING INFORMATION Ordering Number Lead Free Halogen Free L8401L-R16-R L8401G-R16-R Package SSOP-16 Packing Tape Reel L8401G-R16-R (1)Packing Type (2)Package Type (3)Green Package (1) R: Tape Reel (2) R16: SSOP-16 (3) G: Halogen Free and Lead Free, L: Lead Free  MARKING www.unisonic.com.tw Copyright © 2017 Unisonic Technologies Co., Ltd 1 of 5 QW-R123-018.C L8401  PIN CONFIGURATION LINEAR INTEGRATED CIRCUIT  FUNCTIONAL DIAGRAM Fig.1  FUNCTIONAL DESCRIPTION The UTC L8401 includes one negative supply required for gate biasing from the single supply voltage, and all the other bias requirements for external FETs. A low current negative supply voltage includes an internal OSC and two 47nF external cap. The negative rail generator is common to all devices. This negative supply voltage used to drive the FET’s gate to obtain the required drain current because of he FET is a depletion mode transistor. There are for stages in the IC to baising the four external FETS. The drain voltage of the external FET FET1~4 is 2.2 volts set by the UTC L8401. The drain current of external FET is determined by the ex...