Datasheet LTC3857 (Analog Devices) - 38
| 制造商 | Analog Devices |
| 描述 | Low IQ, Dual, 2-Phase Synchronous Step-Down Controller |
| 页数 / 页 | 38 / 38 — TYPICAL APPLICATION. High Efficiency 2-Phase 12V/150W Step-Down … |
| 文件格式/大小 | PDF / 453 Kb |
| 文件语言 | 英语 |
TYPICAL APPLICATION. High Efficiency 2-Phase 12V/150W Step-Down Converter. RELATED PARTS. PART NUMBER. DESCRIPTION. COMMENTS
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LTC3857
TYPICAL APPLICATION High Efficiency 2-Phase 12V/150W Step-Down Converter
RB1 698k INTVCC 100k CF1 SENSE1+ PGOOD2 10pF C1 1nF 100k RA1 SENSE1– PGOOD1 49.9k L1 VFB1 BG1 MBOT1 6μH VOUT CITH1A 68pF SW1 12V C R C SENSE1 OUT1 12.5A BOOST1 B1 10μF 0.47μF 5mΩ 22μF 16V RITH1 2.94k 16V I TG1 MTOP1 TH1 D1 CITH1 3300pF LTC3857 CSS1 0.1μF V V IN IN 19V TO 28V TRACK/SS1 CIN 10μF I 10μF LIM INTVCC 50V C 50V PHSMD INT 4.7μF CLKOUT PGND PLLIN/MODE D2 SGND VOUT EXTVCC TG2 MTOP2 RUN1 CB2 RUN2 BOOST2 0.47μF L2 RSENSE2 FREQ 6μH 5mΩ SS1 SS2 SW2 COUT2 10μF 22μF 16V ITH1 ITH2 BG2 MBOT2 16V VFB1 VFB2 COUT1, COUT2: SANYO 16T0C22M SENSE2– L1: SUMIDA CDEP106-6ROM C2 L2: SUMIDA CDEP106-6ROM 1nF SENSE2+ MTOP1, MTOP2: INFINEON BSZ097NO4LS MBOT1, MBOT2: INFINEON BSZ097NO4LS 3857 TA07
RELATED PARTS PART NUMBER DESCRIPTION COMMENTS
LTC3859 Low IQ, Triple Output Buck/Buck-Boost Synchronous Outputs (≥5V) Remain in Regulation Through Cold Crank, 2.5V ≤ VIN ≤ 38V, DC/DC Controller VOUT(BUCK) Up to 24V, VOUT(BOOST) Up to 60V, IQ = 55μA, LTC3868/LTC3868-1 Low IQ, Dual Output 2-Phase Synchronous Phase-Lockable Fixed Operating Frequency 50kHz to 900kHz, Step-Down DC/DC Controller with 99% Duty Cycle 4V ≤ VIN ≤ 24V, 0.8V ≤ VOUT ≤ 14V, IQ = 170μA, LTC3858/LTC3858-1 Low IQ, Dual Output 2-Phase Synchronous Phase-Lockable Fixed Operating Frequency 50kHz to 900kHz, Step-Down DC/DC Controller with 99% Duty Cycle 4V ≤ VIN ≤ 38V, 0.8V ≤ VOUT ≤ 24V, IQ = 170μA, LTC3890/LTC3890-1 60V, Low IQ, Dual 2-Phase Synchronous Step-Down Phase-Lockable Fixed Operating Frequency 50kHz to 900kHz, DC/DC Controller with 99% Duty Cycle 4V ≤ VIN ≤ 60V, 0.8V ≤ VOUT ≤ 24V, IQ = 50μA, LTC3834/LTC3834-1 Low IQ, Synchronous Step-Down DC/DC Controller Phase-Lockable Fixed Operating Frequency 140kHz to 650kHz, 4V ≤ VIN ≤ 36V, 0.8V ≤ VOUT ≤ 10V, IQ = 30μA, LTC3835/LTC3835-1 Low IQ, Synchronous Step-Down DC/DC Controller Phase-Lockable Fixed Operating Frequency 140kHz to 650kHz, 4V ≤ VIN ≤ 36V, 0.8V ≤ VOUT ≤ 10V, IQ = 80μA, LT3845A Low IQ, High Voltage Synchronous Step-Down Adjustable Fixed Operating Frequency 100kHz to 500kHz, DC/DC Controller 4V ≤ VIN ≤ 60V, 1.23V ≤ VOUT ≤ 36V, IQ = 120μA, TSSOP-16 LTC3824 Low IQ, High Voltage DC/DC Controller, 100% Selectable Fixed 200kHz to 600kHz Operating Frequency, Duty Cycle 4V ≤ VIN ≤ 60V, 0.8V ≤ VOUT ≤ VIN, IQ = 40μA, MSOP-10E 3857fd 38 Linear Technology Corporation LT 0112 REV D • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2009 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS FUNCTIONAL DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS
TYPICAL APPLICATION High Efficiency 2-Phase 12V/150W Step-Down Converter
RB1 698k INTVCC 100k CF1 SENSE1+ PGOOD2 10pF C1 1nF 100k RA1 SENSE1– PGOOD1 49.9k L1 VFB1 BG1 MBOT1 6μH VOUT CITH1A 68pF SW1 12V C R C SENSE1 OUT1 12.5A BOOST1 B1 10μF 0.47μF 5mΩ 22μF 16V RITH1 2.94k 16V I TG1 MTOP1 TH1 D1 CITH1 3300pF LTC3857 CSS1 0.1μF V V IN IN 19V TO 28V TRACK/SS1 CIN 10μF I 10μF LIM INTVCC 50V C 50V PHSMD INT 4.7μF CLKOUT PGND PLLIN/MODE D2 SGND VOUT EXTVCC TG2 MTOP2 RUN1 CB2 RUN2 BOOST2 0.47μF L2 RSENSE2 FREQ 6μH 5mΩ SS1 SS2 SW2 COUT2 10μF 22μF 16V ITH1 ITH2 BG2 MBOT2 16V VFB1 VFB2 COUT1, COUT2: SANYO 16T0C22M SENSE2– L1: SUMIDA CDEP106-6ROM C2 L2: SUMIDA CDEP106-6ROM 1nF SENSE2+ MTOP1, MTOP2: INFINEON BSZ097NO4LS MBOT1, MBOT2: INFINEON BSZ097NO4LS 3857 TA07
RELATED PARTS PART NUMBER DESCRIPTION COMMENTS
LTC3859 Low IQ, Triple Output Buck/Buck-Boost Synchronous Outputs (≥5V) Remain in Regulation Through Cold Crank, 2.5V ≤ VIN ≤ 38V, DC/DC Controller VOUT(BUCK) Up to 24V, VOUT(BOOST) Up to 60V, IQ = 55μA, LTC3868/LTC3868-1 Low IQ, Dual Output 2-Phase Synchronous Phase-Lockable Fixed Operating Frequency 50kHz to 900kHz, Step-Down DC/DC Controller with 99% Duty Cycle 4V ≤ VIN ≤ 24V, 0.8V ≤ VOUT ≤ 14V, IQ = 170μA, LTC3858/LTC3858-1 Low IQ, Dual Output 2-Phase Synchronous Phase-Lockable Fixed Operating Frequency 50kHz to 900kHz, Step-Down DC/DC Controller with 99% Duty Cycle 4V ≤ VIN ≤ 38V, 0.8V ≤ VOUT ≤ 24V, IQ = 170μA, LTC3890/LTC3890-1 60V, Low IQ, Dual 2-Phase Synchronous Step-Down Phase-Lockable Fixed Operating Frequency 50kHz to 900kHz, DC/DC Controller with 99% Duty Cycle 4V ≤ VIN ≤ 60V, 0.8V ≤ VOUT ≤ 24V, IQ = 50μA, LTC3834/LTC3834-1 Low IQ, Synchronous Step-Down DC/DC Controller Phase-Lockable Fixed Operating Frequency 140kHz to 650kHz, 4V ≤ VIN ≤ 36V, 0.8V ≤ VOUT ≤ 10V, IQ = 30μA, LTC3835/LTC3835-1 Low IQ, Synchronous Step-Down DC/DC Controller Phase-Lockable Fixed Operating Frequency 140kHz to 650kHz, 4V ≤ VIN ≤ 36V, 0.8V ≤ VOUT ≤ 10V, IQ = 80μA, LT3845A Low IQ, High Voltage Synchronous Step-Down Adjustable Fixed Operating Frequency 100kHz to 500kHz, DC/DC Controller 4V ≤ VIN ≤ 60V, 1.23V ≤ VOUT ≤ 36V, IQ = 120μA, TSSOP-16 LTC3824 Low IQ, High Voltage DC/DC Controller, 100% Selectable Fixed 200kHz to 600kHz Operating Frequency, Duty Cycle 4V ≤ VIN ≤ 60V, 0.8V ≤ VOUT ≤ VIN, IQ = 40μA, MSOP-10E 3857fd 38 Linear Technology Corporation LT 0112 REV D • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2009 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS FUNCTIONAL DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS