Linear Technology LT3480 Manual Download Page 21 | Manualshive

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LT3480

21

3480fb

TYPICAL APPLICATIONS

1.8V Step-Down Converter

SW

FB

V

C

PG

RT

V

IN

BD

V

IN

3.5V TO 27V

V

OUT

1.8V
2A

4.7μF

0.47μF

47μF

100k

f = 500kHz

D: DIODES INC. DFLS240L
L: TAIYO YUDEN NP06DZB3R3M

D

18.2k

68.1k

L

3.3μH

127k

GND

330pF

ON OFF

LT3480

3480 TA08

RUN/SS

BOOST

SYNC

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Summary of Contents for LT3480

Page 1: ...ckages with exposed pads for low thermal resistance n Wide Input Range Operation from 3 6V to 36V Over Voltage Lockout Protects Circuits through 60V Transients n 2A Maximum Output Current n Low Ripple...

Page 2: ...C LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT3480EDD LT3480EDD TR LCTP 10 Lead 3mm 3mm Plastic DFN 40 C to 85 C LT3480IDD LT3480IDD TR LCTP 10 Lead 3mm 3mm P...

Page 3: ...N TYP MAX UNITS Quiescent Current from VIN VRUN SS 0 2V VBD 3V Not Switching VBD 0 Not Switching l 0 01 30 105 0 5 100 160 A A A Quiescent Current from BD VRUN SS 0 2V VBD 3V Not Switching VBD 0 Not S...

Page 4: ...350 25 3480 G05 200 100 25 0 50 50 0 400 300 250 150 75 100 150 125 VIN 12V VOUT 3 3V CATCH DIODE DIODES INC PDS360 INCREASED SUPPLY CURRENT DUE TO CATCH DIODE LEAKAGE AT HIGH TEMPERATURE INPUT VOLTA...

Page 5: ...AGE mV 0 SWITCHING FREQUENCY kHz 800 1000 1200 600 3480 G14 600 400 200 400 800 500 100 300 700 900 200 0 TEMPERATURE C MINIMUM SWITCH ON TIME ns 80 100 120 3480 G15 60 40 20 0 140 50 25 25 0 50 75 10...

Page 6: ...5 100 150 125 TEMPERATURE C THRESHOLD VOLTAGE 85 90 95 3480 G23 80 75 50 25 25 0 50 75 100 150 125 3480 G24 IL 0 2A DIV VSW 5V DIV VOUT 10mV DIV 5 s DIV VIN 12V FRONT PAGE APPLICATION ILOAD 10mA Error...

Page 7: ...stModeoperationat lowoutputloads Tietoaclocksourceforsynchronization Clockedgesshouldhaveriseandfalltimesfasterthan1 s See synchronizing section in Applications Information PG Pin 7 The PG pin is the...

Page 8: ...e the LT3480 in shutdown disconnecting the output and reducing the input current to less than 1 A The switch driver operates from either the input or from the BOOST pin An external capacitor and diode...

Page 9: ...ion shows that slower switching frequency is necessary to safely accommodate high VIN VOUT ratio Also as shown inthenextsection lowerfrequencyallowsalowerdropout voltage The reason input voltage range...

Page 10: ...equency will determine the ripple current The ripple current IL increases with higher VIN or VOUT anddecreaseswithhigherinductanceandfasterswitching frequency A reasonable starting point for selecting...

Page 11: ...tance may be necessary Thiscanbeprovidedwithalowerperformance electrolytic capacitor Step downregulatorsdrawcurrentfromtheinputsupplyin pulses with very fast rise and fall times The input capaci tor i...

Page 12: ...crease to the typical peak switch current Peak reverse voltage is equal to the regulator input voltage Use a Schottky diode with a reverse voltage rating greater than the input voltage The overvoltage...

Page 13: ...one of the circuits in this data sheet that is similar to your application and tune the compensation network to optimize the performance Stability should then be checked across all operating conditio...

Page 14: ...to get the boost circuit running properly This minimum load will depend on input and output voltages and on the arrangement of the boost circuit The minimum load generally goes to zero once the circu...

Page 15: ...Minimum Input Voltage Depends on Output Voltage Load Current and Boost Circuit 3480 F06 LOAD CURRENT A 1 INPUT VOLTAGE V 4 0 4 5 5 0 10000 3 5 3 0 2 0 10 100 1000 1 10000 10 100 1000 2 5 6 0 5 5 TO S...

Page 16: ...y backup systems where a battery or some other supply is diode OR ed with the LT3480 s output If the VIN pin is allowed to oat and the RUN SS pin is held high either by a logic signal or because it is...

Page 17: ...pply seeLinearTechnologyApplicationNote88for a complete discussion The low loss ceramic capacitor combined with stray inductance in series with the power VIAS TO LOCAL GROUND PLANE VIAS TO VOUT VIAS T...

Page 18: ...ace additional vias can reduce thermal resistance further With these steps the thermal resistance from die or junction to ambient can be reduced to JA 35 C W or less With 100 LFPM air ow this resistan...

Page 19: ...AL APPLICATIONS 3 3V Step Down Converter SW FB VC PG RT VIN BD VIN 4 4V TO 36V TRANSIENT TO 60V VOUT 3 3V 2A 4 7 F 0 47 F 22 F 100k f 800kHz D DIODES INC DFLS240L L TAIYO YUDEN NP06DZB4R7M D 14k 40 2k...

Page 20: ...S INC DFLS240L L NEC TOKIN PLC 0755 100 D 26 1k 40 2k L 10 H 715k GND 330pF ON OFF LT3480 3480 TA06 RUN SS BOOST SYNC 5V 2MHz Step Down Converter SW FB VC PG RT VIN BD VIN 8 6V TO 22V TRANSIENT TO 38V...

Page 21: ...S 1 8V Step Down Converter SW FB VC PG RT VIN BD VIN 3 5V TO 27V VOUT 1 8V 2A 4 7 F 0 47 F 47 F 100k f 500kHz D DIODES INC DFLS240L L TAIYO YUDEN NP06DZB3R3M D 18 2k 68 1k L 3 3 H 127k GND 330pF ON OF...

Page 22: ...OTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH MOLD FLASH IF PRESENT SHALL NOT EXCEED 0 15mm ON ANY SIDE 5 EXPOSED PAD SHALL BE SOLDER PLATED 6 SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TO...

Page 23: ...DE MOLD FLASH PROTRUSIONS OR GATE BURRS MOLD FLASH PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0 152mm 006 PER SIDE 4 DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS INTERLEAD FLASH OR PROTRU...

Page 24: ...ISD 1 A 16 Pin TSSOP Package LT1767 25V 1 2A IOUT 1 1MHz High Ef ciency Step Down DC DC Converter VIN 3V to 25V VOUT MIN 1 2V IQ 1mA ISD 6 A MS8E Package LT1940 Dual 25V 1 4A IOUT 1 1MHz High Ef cien...

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