Datasheet LT1300
| Beschreibung | Micropower High Efficiency 3.3/5V Step-Up DC/DC Converter |
| Seiten / Seite | 8 / 1 — FEATURES. DESCRIPTION. Up to 220mA Output Current at 5V from 2V Supply. … |
| Dateiformat / Größe | PDF / 230 Kb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTION. Up to 220mA Output Current at 5V from 2V Supply. Supply Voltage as Low as 1.8V. APPLICATIONS
Textversion des Dokuments
LT1300 Micropower High Efficiency 3.3/5V Step-Up DC/DC Converter
U FEATURES DESCRIPTION
■
Up to 220mA Output Current at 5V from 2V Supply
The LT1300 is a micropower step-up DC/DC converter that ■
Supply Voltage as Low as 1.8V
utilizes Burst Mode™ operation. The device can deliver 5V ■ Up to 88% Efficiency or 3.3V from a two-cell battery input. It features program- ■ Small Inductor –10µH mable 5V or 3.3V output via a logic-controlled input, no- ■ 120µA Quiescent Current load quiescent current of 120µA and a shutdown pin which ■ Shutdown to 10µA reduces supply current to 10µA. The on-chip power switch ■ Programmable 3.3V or 5V Output has a low 170mV saturation voltage at a switch current of ■ ILIM Pin Programs Peak Switch Current 1A, a four-fold reduction over prior designs. A 155kHz ■ Low VCESAT Switch: 170mV at 1A Typical internal oscillator allows the use of extremely small sur- ■ Uses Inexpensive Surface Mount Inductors face mount inductors and capacitors. Operation is guaran- ■ 8-Lead DIP or SOIC Package teed at 1.8V input. This allows more energy to be extracted
U
from the battery increasing operating life. The ILIM pin can
APPLICATIONS
be used to program peak switch current with a single ■ Palmtop Computers resistor allowing the use of less expensive and smaller ■ Portable Instruments inductors and capacitors in lighter load applications. The ■ Bar-Code Scanners LT1300 is available in an 8-lead SOIC package, minimizing ■ DC/DC Converter Module Replacements board space requirements. For a 5V/12V Selectable Out- ■ Battery Backup Supplies put Converter see the LT1301. For increased output cur- ■ Personal Digital Assistants rent see the LT1302. ■ PCMCIA Cards Burst Mode is a trademark of Linear Technology Corporation.
U TYPICAL APPLICATIONS N Two-Cell to 3.3V/5V Step-Up Converter 5V Output Efficiency
L1 10µH D1 5V/3.3V 90 OUTPUT 6 7 V SW 88 IN VIN = 4.0V 5V/3.3V 2 4 SELECT SENSE 86 2× + SELECT C1 AA LT1300 VIN = 3.0V 100µF + 84 C1 CELL 100µF 3 5 VIN = 2.5V SHUTDOWN SHDN I 82 LIM N/C PGND GND 80 VIN = 2.0V EFFICIENCY (%) 8 1 78 76 L1 = COILCRAFT DO1608-103 LT1300 TA1 OR SUMIDA CD54-100 74 C1 = AVX TPSD107M010R0100 1 10 100 500 OR SANYO OS-CON 16SA100M LOAD CURRENT (mA) D1 = MBRS130LT3 LT1300 TA2 OR 1N5817 1
U FEATURES DESCRIPTION
■
Up to 220mA Output Current at 5V from 2V Supply
The LT1300 is a micropower step-up DC/DC converter that ■
Supply Voltage as Low as 1.8V
utilizes Burst Mode™ operation. The device can deliver 5V ■ Up to 88% Efficiency or 3.3V from a two-cell battery input. It features program- ■ Small Inductor –10µH mable 5V or 3.3V output via a logic-controlled input, no- ■ 120µA Quiescent Current load quiescent current of 120µA and a shutdown pin which ■ Shutdown to 10µA reduces supply current to 10µA. The on-chip power switch ■ Programmable 3.3V or 5V Output has a low 170mV saturation voltage at a switch current of ■ ILIM Pin Programs Peak Switch Current 1A, a four-fold reduction over prior designs. A 155kHz ■ Low VCESAT Switch: 170mV at 1A Typical internal oscillator allows the use of extremely small sur- ■ Uses Inexpensive Surface Mount Inductors face mount inductors and capacitors. Operation is guaran- ■ 8-Lead DIP or SOIC Package teed at 1.8V input. This allows more energy to be extracted
U
from the battery increasing operating life. The ILIM pin can
APPLICATIONS
be used to program peak switch current with a single ■ Palmtop Computers resistor allowing the use of less expensive and smaller ■ Portable Instruments inductors and capacitors in lighter load applications. The ■ Bar-Code Scanners LT1300 is available in an 8-lead SOIC package, minimizing ■ DC/DC Converter Module Replacements board space requirements. For a 5V/12V Selectable Out- ■ Battery Backup Supplies put Converter see the LT1301. For increased output cur- ■ Personal Digital Assistants rent see the LT1302. ■ PCMCIA Cards Burst Mode is a trademark of Linear Technology Corporation.
U TYPICAL APPLICATIONS N Two-Cell to 3.3V/5V Step-Up Converter 5V Output Efficiency
L1 10µH D1 5V/3.3V 90 OUTPUT 6 7 V SW 88 IN VIN = 4.0V 5V/3.3V 2 4 SELECT SENSE 86 2× + SELECT C1 AA LT1300 VIN = 3.0V 100µF + 84 C1 CELL 100µF 3 5 VIN = 2.5V SHUTDOWN SHDN I 82 LIM N/C PGND GND 80 VIN = 2.0V EFFICIENCY (%) 8 1 78 76 L1 = COILCRAFT DO1608-103 LT1300 TA1 OR SUMIDA CD54-100 74 C1 = AVX TPSD107M010R0100 1 10 100 500 OR SANYO OS-CON 16SA100M LOAD CURRENT (mA) D1 = MBRS130LT3 LT1300 TA2 OR 1N5817 1