LT1766EFE DESCRIPTION Demonstration circuit 326C is a monolithic step-down DC/DC switching converter featuring the LT1766EFE. The board is optimized for 5V output at up to 1A load current and a steady state input voltage range of 6V to 60V. With its wide input voltage range, 1.5A internal power switch, 200kHz switching frequency and thermally enhanced package, the LT1766EFE is a very versatile and powerful IC for DC/DC converters that require compact space, high efficiency and tolerance to high input voltage transients. The LT1766EFE 200kHz switching frequency allows all of the components to be small, surface mount devices. Synchronization with an external clock of up to 700kHz is possible. The current-mode control topology creates fast transient response and good loop stability with a minimum number of external components. The low resistance internal power switch (0.2) achieves high efficiencies of up to 90%. The SHDN pin can be used to program undervoltage
.. 7V SHDN Voltage ............................................................ 6V BIAS Pin Voltage ..................................................... 30V FB Pin Voltage/Current (LT1766) ................... 3.5V/2mA Operating Junction Temperature Range LT1766EFE/LT1766EFE-5/LT1766EGN/ LT1766EGN-5 (Note 8,10) ....................-40C to 125C LT1766IFE/LT1766IFE-5/ LT1766IGN/LT1766IGN-5 (Note 8,10) ..-40C to 125C LT1766HFE ..........................................-40C to 140C Storage Temperature Range .................. -65C to 150C Lead Temperature (Soldering, 10 sec) .................. 300C PIN CONFIGURATION TOP VIEW TOP VIEW GND 1 16 GND GND 1 16 GND SW 2 15 SHDN SW 2 15 SHDN 14 SYNC NC 3 14 SYNC 13 NC VIN 4 13 NC 12 FB/SENSE NC 5 12 FB/SENSE BOOST 6 11 VC NC 3 VIN 4 NC 5 BOOST 6 11 VC NC 7 10 BIAS NC 7 10 BIAS GND 8 9 GND GND 8 9 17 GND GND FE PACKAGE 16-LEAD PLASTIC TSSOP GN PACKAGE 16-LEAD PLASTIC SSOP JA = 45C, JC (PIN 17) = 10C/W EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERE
.... 7V SHDN Voltage ........................................................... 6V BIAS Pin Voltage .................................................... 30V FB Pin Voltage/Current (LT1766) ................... 3.5V/2mA Operating Junction Temperature Range LT1766EFE/LT1766EFE-5/LT1766EGN/ LT1766EGN-5 (Note 8,10) ................. - 40C to 125C LT1766IFE/LT1766IFE-5/ LT1766IGN/LT1766IGN-5 (Note 8,10) - 40C to 125C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C U U W PACKAGE/ORDER I FOR ATIO TOP VIEW GND 1 16 GND SW 2 15 SHDN ORDER PART NUMBER LT1766EFE LT1766IFE LT1766EFE-5 LT1766IFE-5 GND 1 16 GND SW 2 15 SHDN NC 3 14 SYNC VIN 4 13 NC NC 5 12 FB/SENSE BOOST 6 11 VC NC 3 VIN 4 NC 5 12 FB/SENSE BOOST 6 11 VC NC 7 10 BIAS NC 7 10 BIAS GND 8 9 GND GND 8 9 14 SYNC 17 13 NC ORDER PART NUMBER TOP VIEW LT1766EGN LT1766IGN LT1766EGN-5 LT1766IGN-5 GN PART MARKING GND FE PACKAGE 16-LEAD PLASTIC TSSOP G
.... 7V SHDN Voltage ........................................................... 6V BIAS Pin Voltage .................................................... 30V FB Pin Voltage/Current (LT1766) ................... 3.5V/2mA Operating Junction Temperature Range LT1766EFE/LT1766EFE-5/LT1766EGN/ LT1766EGN-5 (Note 8,10) ................. - 40C to 125C LT1766IFE/LT1766IFE-5/ LT1766IGN/LT1766IGN-5 (Note 8,10) - 40C to 125C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C U U W PACKAGE/ORDER I FOR ATIO TOP VIEW GND 1 16 GND SW 2 15 SHDN ORDER PART NUMBER LT1766EFE LT1766IFE LT1766EFE-5 LT1766IFE-5 GND 1 16 GND SW 2 15 SHDN NC 3 14 SYNC VIN 4 13 NC NC 5 12 FB/SENSE BOOST 6 11 VC NC 3 VIN 4 NC 5 12 FB/SENSE BOOST 6 11 VC NC 7 10 BIAS NC 7 10 BIAS GND 8 9 GND GND 8 9 14 SYNC 17 13 NC ORDER PART NUMBER TOP VIEW LT1766EGN LT1766IGN LT1766EGN-5 LT1766IGN-5 GN PART MARKING GND FE PACKAGE 16-LEAD PLASTIC TSSOP G
.... 7V SHDN Voltage ........................................................... 6V BIAS Pin Voltage .................................................... 30V FB Pin Voltage/Current (LT1766) ................... 3.5V/2mA Operating Junction Temperature Range LT1766EFE/LT1766EFE-5/ LT1766EGN/LT1766EGN-5 (Note 8) .. - 40C to 125C LT1766IFE/LT1766IFE-5/ LT1766IGN/LT1766IGN-5 (Note 8) .... - 40C to 125C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C U U W PACKAGE/ORDER I FOR ATIO TOP VIEW GND 1 16 GND SW 2 15 SHDN ORDER PART NUMBER ORDER PART NUMBER TOP VIEW LT1766EFE LT1766IFE LT1766EFE-5 LT1766IFE-5 GND 1 16 GND SW 2 15 SHDN NC 3 14 SYNC VIN 4 13 NC NC 5 12 FB/SENSE BOOST 6 11 VC NC 3 14 SYNC VIN 4 13 NC NC 5 12 FB/SENSE BOOST 6 11 VC NC 7 10 BIAS NC 7 10 BIAS GND 8 9 GND GND 8 9 LT1766EGN LT1766IGN LT1766EGN-5 LT1766IGN-5 GN PART MARKING GND FE PACKAGE 16-LEAD PLASTIC TSSOP GN PACKAGE 16-LEAD P
.... 7V SHDN Voltage ........................................................... 6V BIAS Pin Voltage .................................................... 30V FB Pin Voltage/Current (LT1766) ................... 3.5V/2mA Operating Junction Temperature Range LT1766EFE/LT1766EFE-5/LT1766EGN/ LT1766EGN-5 (Note 8,10) ................. - 40C to 125C LT1766IFE/LT1766IFE-5/ LT1766IGN/LT1766IGN-5 (Note 8,10) - 40C to 125C LT1766HGN/LT1766HFE ................... - 40C to 140C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C U U W PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW GND 1 16 GND GND 1 16 GND SW 2 15 SHDN SW 2 15 SHDN NC 3 14 SYNC NC 3 14 SYNC VIN 4 13 NC VIN 4 13 NC NC 5 12 FB/SENSE NC 5 12 FB/SENSE BOOST 6 11 VC BOOST 6 11 VC NC 7 10 BIAS NC 7 10 BIAS GND 8 9 GND GND 8 9 17 GND FE PACKAGE 16-LEAD PLASTIC TSSOP GN PACKAGE 16-LEAD PLASTIC SSOP JA = 45C/W, JC (PAD) = 10C/W EXPOSED PAD (PIN 17) IS GND, MUST BE CONNECTED TO PC
.... 7V SHDN Voltage ........................................................... 6V BIAS Pin Voltage .................................................... 30V FB Pin Voltage/Current (LT1766) ................... 3.5V/2mA Operating Junction Temperature Range LT1766EFE/LT1766EFE-5/LT1766EGN/ LT1766EGN-5 (Note 8,10) ................. - 40C to 125C LT1766IFE/LT1766IFE-5/ LT1766IGN/LT1766IGN-5 (Note 8,10) - 40C to 125C LT1766HGN/LT1766HFE ................... - 40C to 140C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C U U W PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW GND 1 16 GND GND 1 16 GND SW 2 15 SHDN SW 2 15 SHDN NC 3 14 SYNC NC 3 14 SYNC VIN 4 13 NC VIN 4 13 NC NC 5 12 FB/SENSE NC 5 12 FB/SENSE BOOST 6 11 VC BOOST 6 11 VC NC 7 10 BIAS NC 7 10 BIAS GND 8 9 GND GND 8 9 17 GND FE PACKAGE 16-LEAD PLASTIC TSSOP GN PACKAGE 16-LEAD PLASTIC SSOP JA = 45C/W, JC (PAD) = 10C/W EXPOSED PAD (PIN 17) IS GND, MUST BE CONNECTED TO PC
.... 7V SHDN Voltage ........................................................... 6V BIAS Pin Voltage .................................................... 30V FB Pin Voltage/Current (LT1766) ................... 3.5V/2mA Operating Junction Temperature Range LT1766EFE/LT1766EFE-5/ LT1766EGN/LT1766EGN-5 (Note 8) .. - 40C to 125C LT1766IFE/LT1766IFE-5/ LT1766IGN/LT1766IGN-5 (Note 8) .... - 40C to 125C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C U U W PACKAGE/ORDER I FOR ATIO TOP VIEW GND 1 16 GND SW 2 15 SHDN ORDER PART NUMBER ORDER PART NUMBER TOP VIEW LT1766EFE LT1766IFE LT1766EFE-5 LT1766IFE-5 GND 1 16 GND SW 2 15 SHDN NC 3 14 SYNC VIN 4 13 NC NC 5 12 FB/SENSE BOOST 6 11 VC NC 3 14 SYNC VIN 4 13 NC NC 5 12 FB/SENSE BOOST 6 11 VC NC 7 10 BIAS NC 7 10 BIAS GND 8 9 GND GND 8 9 LT1766EGN LT1766IGN LT1766EGN-5 LT1766IGN-5 GN PART MARKING GND FE PACKAGE 16-LEAD PLASTIC TSSOP GN PACKAGE 16-LEAD P
.... 7V SHDN Voltage ........................................................... 6V BIAS Pin Voltage .................................................... 30V FB Pin Voltage/Current (LT1766) ................... 3.5V/2mA Operating Junction Temperature Range LT1766EFE/LT1766EFE-5/ LT1766EGN/LT1766EGN-5 (Note 8) .. - 40C to 125C LT1766IFE/LT1766IFE-5/ LT1766IGN/LT1766IGN-5 (Note 8) .... - 40C to 125C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C U U W PACKAGE/ORDER I FOR ATIO TOP VIEW GND 1 16 GND SW 2 15 SHDN ORDER PART NUMBER ORDER PART NUMBER TOP VIEW LT1766EFE LT1766IFE LT1766EFE-5 LT1766IFE-5 GND 1 16 GND SW 2 15 SHDN NC 3 14 SYNC VIN 4 13 NC NC 5 12 FB/SENSE BOOST 6 11 VC NC 3 14 SYNC VIN 4 13 NC NC 5 12 FB/SENSE BOOST 6 11 VC NC 7 10 BIAS NC 7 10 BIAS GND 8 9 GND GND 8 9 LT1766EGN LT1766IGN LT1766EGN-5 LT1766IGN-5 GN PART MARKING GND FE PACKAGE 16-LEAD PLASTIC TSSOP GN PACKAGE 16-LEAD P
5 LT1763MPS8 LT1764AEFE LT1764AEFE-1.5 LT1764AEFE-1.8 LT1764AEFE-2.5 LT1764AEFE-3.3 LT1764EFE LT1764EFE-1.5 LT1764EFE-1.8 LT1764EFE-2.5 LT1764EFE-3.3 LT1765ES8 LT1765EFE LT1765EFE-1.8 LT1765EFE-2.5 LT1765EFE-3.3 LT1765EFE-5 LT1766CS8 LT1766EGN LT1766EGN-5 LT1766EFE LT1766EFE-5 LT1766HFE LT1766HFE-5 LT1766IGN LT1766IS8 LT1766IGN-5 LT1766IFE LT1766IFE-5 LT1766CS8-SYNC LT1767ES8 LT1768CGN LT1768IGN LTC1770CS8 LTC1770IS8 LTC1771ES8 LTC1771IS8 LTC1772CS8 LTC1775CGN LTC1775IGN LT1776CS8 LT1776IS8 LT1777CGN LTC1778EGN LTC1778EGN-1 LTC1778AEGN 167 Reference Material 1569I6 1569I7 15715 1573 157325 157328 157333 1573I 1575 157515 157528 157533 157535 15755 1576 15765 1576I 1576I5 1576SN 1578 157825 1578I 1579 1579 15793 15793 157933 157933 15795 15795 1579I 1579I3 1579I5 1595A 1595AI 1595B 1595BI 1595C 1595CI 15I335 1610 1610I 1612 1614 1614I 1618 1619 1619I 1620 1620 1620I 1620I 1621 1621I 1622 1622I 1623 1623I 1624 1624I 1625 1625I 1627 1627I 1628 1628I 1630 1630I 1632 1632I 1634A1 1634A2 1
5 LT1763MPS8 LT1764AEFE LT1764AEFE-1.5 LT1764AEFE-1.8 LT1764AEFE-2.5 LT1764AEFE-3.3 LT1764EFE LT1764EFE-1.5 LT1764EFE-1.8 LT1764EFE-2.5 LT1764EFE-3.3 LT1765ES8 LT1765EFE LT1765EFE-1.8 LT1765EFE-2.5 LT1765EFE-3.3 LT1765EFE-5 LT1766CS8 LT1766EGN LT1766EGN-5 LT1766EFE LT1766EFE-5 LT1766HFE LT1766HFE-5 LT1766IGN LT1766IS8 LT1766IGN-5 LT1766IFE LT1766IFE-5 LT1766CS8-SYNC LT1767ES8 LT1768CGN LT1768IGN LTC1770CS8 LTC1770IS8 LTC1771ES8 LTC1771IS8 LTC1772CS8 LTC1775CGN LTC1775IGN LT1776CS8 LT1776IS8 LT1777CGN 177 Reference Material 1569I6 1569I7 15715 1573 157325 157328 157333 1573I 1575 157515 157528 157533 157535 15755 1576 15765 1576I 1576I5 1576SN 1578 157825 1578I 1579 1579 15793 15793 157933 157933 15795 15795 1579I 1579I3 1579I5 1595A 1595AI 1595B 1595BI 1595C 1595CI 15I335 1610 1610I 1612 1614 1614I 1618 1619 1619I 1620 1620 1620I 1620I 1621 1621I 1622 1622I 1623 1623I 1624 1624I 1625 1625I 1627 1627I 1628 1628I 1630 1630I 1632 1632I 1634A1 1634A2 1634A4 1634A5 Space, Military, Harsh
5 LT1763MPS8 LT1764AEFE LT1764AEFE-1.5 LT1764AEFE-1.8 LT1764AEFE-2.5 LT1764AEFE-3.3 LT1764EFE LT1764EFE-1.5 LT1764EFE-1.8 LT1764EFE-2.5 LT1764EFE-3.3 LT1765ES8 LT1765EFE LT1765EFE-1.8 LT1765EFE-2.5 LT1765EFE-3.3 LT1765EFE-5 LT1766EGN LT1766CS8 LT1766EGN-5 LT1766EFE LT1766EFE-5 LT1766HFE LT1766HFE-5 LT1766IGN LT1766IS8 LT1766IGN-5 LT1766IFE LT1766IFE-5 LT1766CS8-SYNC LT1767ES8 LT1768CGN LT1768IGN LTC1770CS8 LTC1770IS8 LTC1771ES8 LTC1771IS8 LTC1772CS8 LTC1775CGN LTC1775IGN LT1776CS8 LT1776IS8 LT1777CGN LTC1778EGN LTC1778EGN-1 LTC1778AEGN LTC1778AIGN LTC1778HGN LTC1778IGN LTC1779ES8 LT1785CS8 LT1785ACS8 LT1785AIS8 LT1785IS8 LT1787CS8 LT1787HS8 LT1787HVCS8 LT1787IS8 LT1789CGN-1 LT1789CS8-1 Reference Material 157515 157528 157533 157535 15755 1576 15765 1576I 1576I5 1576SN 1578 157825 1578I 1579 1579 15793 15793 157933 157933 15795 15795 1579I 1579I3 1579I5 1595A 1595AI 1595B 1595BI 1595C 1595CI 15I335 1600 1600I 1610 1610I 1612 1614 1614I 1618 1619 1619I 1620 1620 1620I 1620I 1621 1621I
ter to convert the bus's 8V to 40V input to a 5V or 3.3V output. Since many of these devices are portable consumer electronics, power consumption requirements are increasing while available space is VIN 8V TO 40V R1 4.7k C2 15nF C1 220pF VIN BOOST SYNC SW LT1766EFE SHDN BIAS FB VC R2 8.66k GND C3: TDK C4532X7R1H225K C5: TAIYO YUDEN JMK432BJ476M L1: SUMIDA CDRH8D28-220 D1 10MQ060N R3 4.99k C5 47F CER DN287 F01 Figure 1. This Low Component Count, 8V to 40V IN, 3.3V at 1A OUT DC/DC Converter Uses All Ceramic Capacitors (Max Height of 3.0mm) 06/02/287 The LT1766/LT3430 high voltage buck regulators used in these solutions provide high current for FireWire peripherals with several key advantages, such as 60V input capabilities, 200kHz operating frequency, high power internal 1.5A/3A power switch current limits, shutdown capability and thermally enhanced 16-pin TSSOP exposed lead-frame packages. The external location of both the feedback and compensation components, combined with the current mode , LTC
6EFE#PBF LT1176CSW-5#PBF LT1076CT#PBF LT1076CT-5#PBF LT1076HVCT#PBF LT1766IFE#PBF LT1766IGN#PBF LT1767EMS8-5#PBF LT1912EDD#PBF LT1912EMSE#PBF LT1956IGN#PBF LT3505IMS8E#PBF LT1976IFE#PBF LT3508EFE#PBF LT1076CQ#PBF LT1076IR#PBF LT1765EFE-5#PBF LT1765ES8#PBF LT1766EFE-5#PBF LT1766EGN-5#PBF LT1956EGN#PBF LT1956EGN-5#PBF LT3430EFE#PBF LT3430IFE#PBF LT3431EFE#PBF LT3434IFE#PBF LT1913EDD#PBF LT3501IFE#PBF LT3480EDD#PBF LT3480EMSE#PBF LT3684EMSE#PBF LT3685EMSE#PBF LT3481EMSE#PBF LT3681EDE#PBF LT1765EFE-3.3#PBF LT3431IFE#PBF LT1074CT#PBF LT1074HVCT#PBF LT3693EMSE#PBF LT3693IDD#PBF LTC3614EUDD#PBF LT1765EFE#PBF LTC3865EFE#PBF LTC3865EUH#PBF LTC3865EUH-1#PBF LTC3633EFE#PBF LTC3633EUFD#PBF LTC3860EUH#PBF LT3970EDDB-3.3#PBF LT3970EMS-3.3#PBF LT3845EN#PBF Input Voltage Switch Range Current (V) Max (A) 0.1 2.7 to 5.5 0.05 2.7 to 20 0.05 2.7 to 20 0.05 2.7 to 20 0.05 2.7 to 20 1.2 3.6 to 37 1.3 4 to 35 0.55 7 to 48 0.55 7 to 48 0.7 7.4 to 40 0.7 7.4 to 40 0.7 4 to 60 0.9 -0.3 to 60 0.9 3.3 to 80 0.9 3.7 to 36 0.