Datasheet LTC7800 (Analog Devices) - 29

LTC7800
APPLICATIONS INFORMATION
VIN 4V TO 58V C LTC7800 INA 2.2µF CINB VIN 56µF INTVCC ×3 PLLIN/MODE 2.2µF RUN PGND ILIM D1 100k INTVCC PGOOD TG MTOP 0.1µF EXTV 25.5k CC BOOST L1 R 1.3µH SENSE FREQ 3mΩ VOUT 2.2nF SW 3.3V C 3.92k OUT 15A 100µF ITH BG MBOT 100pF ×2 RFLT 0.1µF 100Ω SENSE+ 280k TRACK/SS 1nF 10pF SGND SENSE– VFB SGND 90.9k MTOP, MBOT: INFINEON BSC100N06LS3 L1: WURTH 7443551130 7800 F13 CINA: TDK C4532X7R2A225M CINB: SUN ELECT 63HVH56M COUT: TDK C4532X5R0J107M D1: CENTRAL SEMI CMDD6001
Figure 13. High Efficiency 3.3V 320kHz Step-Down Regulator
VIN 30V TO C 60V* IN 4.7µF LTC7800 ×4 VIN INTVCC RUN 2.2µF
Efficiency vs Output Current
PLLIN/MODE PGND MTOP I 100 LIM 100k TG 95 INTVCC PGOOD D1 D3 90 VOUT EXTVCC 85 30.1k 10Ω 0.1µF FREQ 80 L1 BOOST 4.7nF 1.2µH 75 3.32k VOUT ITH SW 5V 70 22pF MBOT COUT 20A* EFFICIENCY (%) 47µF 65 BG D2 ×3 R 60 0.1µF FLT VIN = 48V 6.49k 55 VOUT = 5V TRACK/SS SENSE+ FCM MODE OPERATION 0.1µF 50 SGND 107k SENSE– 0 2 4 6 8 10 12 14 16 18 20 SGND 1nF OUTPUT CURRENT (A) 7800 F14b MTOP: EPC EPC2001 V MBOT: EPC EPC2021 FB L1: COILCRAFT SER2010 122ML 20k IN C : TDK C4532X7R2A475M OUT C : TDK C4532X5R1A476M 7800 F14a D1: STM BAT41K *OUTPUT CURRENT CAPABILITY AT HIGH INPUT VOLTAGES D2: DIODES DFLS2100 MAY BE LIMITED BY THE THERMAL CHARACTERISTICS OF D3: BOURNS CD0603-Z5V1 THE OVERALL SYSTEM AND PRINTED CIRCUIT BOARD DESIGN.
Figure 14. High Efficiency 5V 450kHz Step-Down Regulator Using GaN FETs
7800f For more information www.linear.com/LTC7800 29 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions FUNCTIONAL Diagram Operation Applications Information Typical Application Related Parts