Datasheet LT1110 (Linear Technology)
| Hersteller | Linear Technology |
| Beschreibung | Micropower DC-DC Converter Adjustable and Fixed 5V, 12V |
| Seiten / Seite | 16 / 1 — FEATU. DESCRIPTIO. Operates at Supply Voltages From 1.0V to 30V. Only … |
| Dateiformat / Größe | PDF / 323 Kb |
| Dokumentensprache | Englisch |
FEATU. DESCRIPTIO. Operates at Supply Voltages From 1.0V to 30V. Only Three External Off-the-Shelf Components. Required
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LT1110 Micropower DC-DC Converter Adjustable and Fixed 5V, 12V
U FEATU S RE DESCRIPTIO
■
Operates at Supply Voltages From 1.0V to 30V
The LT1110 is a versatile micropower DC-DC converter. ■ Works in Step-Up or Step-Down Mode The device requires only three external components to ■
Only Three External Off-the-Shelf Components
deliver a fixed output of 5V or 12V. The very low minimum
Required
supply voltage of 1.0V allows the use of the LT1110 in ■ Low-Battery Detector Comparator On-Chip applications where the primary power source is a single ■ User-Adjustable Current Limit cell. An on-chip auxiliary gain block can function as a low ■ Internal 1A Power Switch battery detector or linear post regulator. ■ Fixed or Adjustable Output Voltage Versions The 70kHz oscillator allows the use of surface mount ■ Space-Saving 8-Pin MiniDIP or S8 Package inductors and capacitors in many applications. Quiescent
O U
current is just 300µA, making the device ideal in remote or
APPLICATI S
battery powered applications where current consumption ■ must be kept to a minimum. Pagers ■ Cameras The device can easily be configured as a step-up or ■ Single-Cell to 5V Converters step-down converter, although for most step-down ■ Battery Backup Supplies applications or input sources greater than 3V, the LT1111 ■ Laptop and Palmtop Computers is recommended. Switch current limiting is user-adjustable ■ Cellular Telephones by adding a single external resistor. Unique reverse battery ■ Portable Instruments protection circuitry limits reverse current to safe, non- ■ Laser Diode Drivers destructive levels at reverse supply voltages up to 1.6V. ■ Hand-Held Inventory Computers
O U TYPICAL APPLICATI All Surface Mount Single Cell to 5V Converter Efficiency
90 SUMIDA CD54-470K MBRS120T3 85 47µH 5V 80 VIN = 1.50V 1 2 75 V I V IN = 1.25V LIM IN SW1 70 V 3 IN = 1.00V 1.5V LT1110-5 AA CELL* 65 EFFICIENCY (%) SENSE 60 8 GND SW2 + 15µF 5 4 TANTALUM 55 50 OPERATES WITH CELL VOLTAGE 1.0V ≥ 0 5 10 15 20 25 30 35 40 *ADD 10 F DECOUPLING CAPACITOR IF BATTERY µ LOAD CURRENT (mA) LT1110 • TA01 IS MORE THAN 2" AWAY FROM LT1110. LT1110 • TA02 1
U FEATU S RE DESCRIPTIO
■
Operates at Supply Voltages From 1.0V to 30V
The LT1110 is a versatile micropower DC-DC converter. ■ Works in Step-Up or Step-Down Mode The device requires only three external components to ■
Only Three External Off-the-Shelf Components
deliver a fixed output of 5V or 12V. The very low minimum
Required
supply voltage of 1.0V allows the use of the LT1110 in ■ Low-Battery Detector Comparator On-Chip applications where the primary power source is a single ■ User-Adjustable Current Limit cell. An on-chip auxiliary gain block can function as a low ■ Internal 1A Power Switch battery detector or linear post regulator. ■ Fixed or Adjustable Output Voltage Versions The 70kHz oscillator allows the use of surface mount ■ Space-Saving 8-Pin MiniDIP or S8 Package inductors and capacitors in many applications. Quiescent
O U
current is just 300µA, making the device ideal in remote or
APPLICATI S
battery powered applications where current consumption ■ must be kept to a minimum. Pagers ■ Cameras The device can easily be configured as a step-up or ■ Single-Cell to 5V Converters step-down converter, although for most step-down ■ Battery Backup Supplies applications or input sources greater than 3V, the LT1111 ■ Laptop and Palmtop Computers is recommended. Switch current limiting is user-adjustable ■ Cellular Telephones by adding a single external resistor. Unique reverse battery ■ Portable Instruments protection circuitry limits reverse current to safe, non- ■ Laser Diode Drivers destructive levels at reverse supply voltages up to 1.6V. ■ Hand-Held Inventory Computers
O U TYPICAL APPLICATI All Surface Mount Single Cell to 5V Converter Efficiency
90 SUMIDA CD54-470K MBRS120T3 85 47µH 5V 80 VIN = 1.50V 1 2 75 V I V IN = 1.25V LIM IN SW1 70 V 3 IN = 1.00V 1.5V LT1110-5 AA CELL* 65 EFFICIENCY (%) SENSE 60 8 GND SW2 + 15µF 5 4 TANTALUM 55 50 OPERATES WITH CELL VOLTAGE 1.0V ≥ 0 5 10 15 20 25 30 35 40 *ADD 10 F DECOUPLING CAPACITOR IF BATTERY µ LOAD CURRENT (mA) LT1110 • TA01 IS MORE THAN 2" AWAY FROM LT1110. LT1110 • TA02 1