n Up to 220mA Output Current at 5V from 2V Supply n Supply Voltage as Low as 8V n Up to Efficiency n Small Inductor H n A Quiescent Current n Shutdown to A n Programmable 3V or 5V Output n ILIM Pin Programs Peak Switch Current n Low VCESAT Switch: 170mV at 1A Typical n Uses Inexpensive Surface Mount Inductors n Lead DIP or SOIC Package

Description

1LT1300 n Up to 220mA Output Current at 5V from 2V Supply n Supply Voltage as Low as 1.8V n Up to 88% Efficiency n Small Inductor –10µH n 120µA Quiescent Current n Shutdown to 10µA n Programmable 3.3V or 5V Output n ILIM Pin Programs Peak Switch Current n Low VCESAT Switch: 170mV at 1A Typical n Uses Inexpensive Surface Mount Inductors n 8-Lead DIP or SOIC Package n Palmtop Computers n Portable Instruments n Bar-Code Scanners n DC/DC Converter Module Replacements n Battery Backup Supplies n Personal Digital Assistants n PCMCIA Cards The LT1300 is a micropower step-up DC/DC converter that utilizes Burst Mode™ operation. The device can deliver 5V or 3.3V from a two-cell battery input. It features program- mable 5V or 3.3V output via a logic-controlled input, no- load quiescent current of 120µA and a shutdown pin which reduces supply current to 10µA. The on-chip power switch has a low 170mV saturation voltage at a switch current of 1A, a four-fold reduction over prior designs. A 155kHz internal oscillator allows the use of extremely small sur- face mount inductors and capacitors. Operation is guaran- teed at 1.8V input. This allows more energy to be extracted from the battery increasing operating life.

• output current


• lt1300


• a3 driver


• µa


• switch current


• pin


• div

Sujets

• Burst mode
• Current
• Régulation
• Linear Technology

Informations

• Publié par: pefav
• Nombre de lectures: 14
• Langue: English

Extrait

LT1300 Mrpwr Hgh ffny 3.3/5V Stp-p D/D nvrtr

FEATURES p t 220m tpt rrnt t 5V frm 2V Spply n n Spply Vltg s Lw s 1.8V n p t 88% ffny n Smll ndtr –10mH n 120m Qsnt rrnt Shtdwn t 10m n n Prgrmmbl 3.3V r 5V tpt  Pn Prgrms Pk Swth rrnt n LM n Lw V Swth: 170mV t 1 Typl ST ss nxpnsv Srf Mnt ndtrs n n 8-Ld DP r S Pkg APPLICATIONS n Plmtp mptrs n Prtbl nstrmnts Br-d Snnrs n D/D nvrtr Mdl Rplmnts n n Bttry Bkp Sppls n Prsnl Dgtl ssstnts n PM rds

TYPICAL APPLICATIONSN

2´ AA CELL

Tw-ll t 3.3V/5V Stp-p nvrtr L1 10µH D1

6 7 V SW IN 4 5V/3.3V 2 SELECT SENSE SELECT + C1 LT1300 100µF 3 5 SHUTDOWN SHDN I N/C LIM PGND GND 8 1

L1 = LRFT D1608-103 R SMD D54-100 1 = VX TPSD107M010R0100 R SNY S-N 16S100M D1 = MBRS130LT3 R 1N5817

5V/3.3V OUTPUT

+ C1 100µF

LT1300 TA1

DESCRIPTION Th LT1300 s  mrpwr stp-p D/D nvrtr tht tlzs Brst Md™ prtn. Th dv n dlvr 5V r 3.3V frm  tw-ll bttry npt. t ftrs prgrm- mbl 5V r 3.3V tpt v  lg-ntrlld npt, n- ld qsnt rrnt f 120m nd  shtdwn pn whh rds spply rrnt t 10m. Th n-hp pwr swth hs  lw 170mV strtn vltg t  swth rrnt f 1,  fr-fld rdtn vr prr dsgns.  155kHz ntrnl slltr llws th s f xtrmly smll sr- f mnt ndtrs nd ptrs. prtn s grn- td t 1.8V npt. Ths llws mr nrgy t b xtrtd frm th bttry nrsng prtng lf. Th  pn n LM b sd t prgrm pk swth rrnt wth  sngl rsstr llwng th s f lss xpnsv nd smllr ndtrs nd ptrs n lghtr ld ppltns. Th LT1300 s vlbl n n 8-ld S pkg, mnmzng brd sp rqrmnts. Fr  5V/12V Sltbl t- pt nvrtr s th LT1301. Fr nrsd tpt r- rnt s th LT1302. Brst Md s  trdmrk f Lnr Thnlgy rprtn.

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74 1

5V tpt ffny

V = 4.0V IN

V = 3.0V IN V = 2.5V IN

V = 2.0V IN

10 100 LOAD CURRENT (mA)

500

LT1300 TA2

1