HMC976LP3E Datasheet, PDF (8/12 Pages) Hittite Microwave Corporation – 400mA LOW NOISE, HIGH PSRR LINEAR VOLTAGE REGULATOR

v02.1112
Figure 13. Evaluation PCB Schematic
HMC976LP3E
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
Operational Features
The recommended configuration is “HMC976LP3E 4.8V User Application Schematic”. This is for the default output
voltage of 4.8V nominal. The values shown are those recommended for optimum Noise Spectral density. For users
requiring extremely low noise in the 1 MHz to 10 MHz range the largest output capacitor should be used: a 68uF takes
the noise between 100 kHz and 1 MHz to below 2.5nV/√Hz.
Load Capacitor Characteristics
The HMC976LP3E was designed to work with a low ESR ceramic load capacitor on the VRX pin (C21 in the
schematic above). Low ESR ceramic capacitors are very small and best for eliminating high frequency noise. Ceramic
capacitors can vary as much as 50% versus temperature and 60% versus voltage, dependant on the ceramic type
e.g. Z5U, Y5V, X7R or X5R. There are no restrictions on ceramic type or minimum ESR, only that the user must
guarantee that the minimum output capacitance over operating conditions is 4.7μF, smaller values can result in noise
peaking or lower stability.
Irrliniecgfseohpntr_{Fsomsenooasftirisibtohinpgilrirtdryafuinpircstnaeeairdstsih,esbesuyd}dmthi_{emebadltypimlvbiAcyaeanyAtariorlny}oenagslu_9ooalDrgt7neofDr₈vto_{dheimc-eve2ritcwisote5sissius0epfsob-eulra.3neidtSlc}is₃eep_evur_{4eescade3oinf,iyctnr}o_{taodpetriaboelftenoersrn•s}atasc_:noucyrb9Hujipern₇aac_{ifrt8ttteietntn-oigatt2ecnerm5hdigaeMh0nrntegs-tlsiei3}a_{coobwf3rflAio}ept_{7hn.awoa3tHueloatongf}wnt_vsaoDeeotxviecreveor_{Ci,.ct•heNnoesoor.rOproFOPdrohenaroertnpiTOoerei:nccn7e,h-8,nl21iodn-3lEeoe2lgli9viayze-t4arWy7wb,a0eyaw0,tn•hPwd.OO.Dthor.dirBtieptvorilaetxoec,n9.eCcl1in0oohe6rmde,aeNltmrwos:rswwAfwoono.raaddlno,,agMMloADgAe.0cv20oic0m1e68s22,-94In10c.6,}
8
Trademarks and registered trademarks are the property of their _Ares_pp_pec_lt_iiv_ce_ao_tw_in_oe_nrs._{Support: [e-mail]}: Phone: 1-800-ANALOG-D