HMC976LP3E

v02.1112 Typical Applications The HMC976LP3E is ideal for: Test Instrumentation Military Radios, Radar and ECM Basestation Infrastructure Ultra Low Noise Frequency Generation Fractional-N Synthesizer Supply Microwave VCO Supply Mixed-Signal Circuit Supply Low Noise Baseband Circuit Supply HMC976LP3E 400mA LOW NOISE, HIGH PSRR LINEAR VOLTAGE REGULATOR Features High Output Current: 400mA Low Dropout: 300mV at 400mA Output and VR>3V Ultra Low Noise: 3nV/√Hz at 10 kHz, 6nV/√Hz at 1 kHz High Power Supply Rejection Ratio (PSRR): <-60 dB at 1 kHz, <-30 dB at 1 MHz Adjustable Voltage Output: VR 1.8 to 5V at 400mA Designed to work with low ESR ceramic capacitors Low Power-Down Current: <1 µA Thermal Protection 16 Lead 3x3 mm SMT Package: 9mm² POWER CONDITIONING - SMT Functional Diagram General Description The HMC976LP3E is a BiCMOS ultra low noise linear voltage regulator. The high Power Supply Rejection Ratio (PSRR) in the 0.1 MHz to 10 MHz range provides excellent rejection of any preceding switching regulator or other power supply noise. The voltage output is ideal for frequency generation subsystems including Hittite’s broad line of PLLs with integrated VCOs. The output voltage can be adjusted lower than the default value by using one external resistor. The output can be set to 5V by grounding the HV pin. The regulator can be powered down by the TTL-compatible Enable input. The HMC976LP3E is housed in a 3x3mm QFN SMT package. Table 1. Electrical Specifications...