Datasheet LT1073 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Micropower DC-DC Converter Adjustable and Fixed 5V, 12V |
| Pages / Page | 17 / 1 — FEATURES. DESCRIPTION. APPLICATIONS. TYPICAL APPLICATION. Single Alkaline … |
| File Format / Size | PDF / 1.4 Mb |
| Document Language | English |
FEATURES. DESCRIPTION. APPLICATIONS. TYPICAL APPLICATION. Single Alkaline “AA” Cell Operating. Single-Cell to 5V Converter
Model Line for this Datasheet
Text Version of Document
LT1073 Micropower DC/DC Converter Adjustable and Fixed 5V, 12V
FEATURES DESCRIPTION
n No Design Required The LT®1073 is a versatile micropower DC/DC converter. The n Operates at Supply Voltages from 1V to 30V device requires only three external components to deliver n Consumes Only 95µA Supply Current a fixed output of 5V or 12V. The very low minimum supply n Works in Step-Up or Step-Down Mode voltage of 1V allows the use of the LT1073 in applications n Only Three External Off-the-Shelf Components where the primary power source is a single cell. An on-chip Required auxiliary gain block can function as a low-battery detector n Low-Battery Detector Comparator On-Chip or linear post-regulator. n User-Adjustable Current Limit Average current drain of the LT1073-5 used as shown in n Internal 1A Power Switch the Typical Application circuit below is just 135µA unloaded, n Fixed or Adjustable Output Voltage Versions making it ideal for applications where long battery life is n Space-Saving 8-Pin PDIP or SO-8 Package important. The circuit shown can deliver 5V at 40mA from an input as low as 1.25V and 5V at 10mA from a 1V input.
APPLICATIONS
The device can easily be configured as a step-up or step- n Pagers down converter, although for most step-down applications n Cameras or input sources greater than 3V, the LT1173 is recom- n Single-Cell to 5V Converters mended. Switch current limiting is user-adjustable by n Battery Backup Supplies adding a single external resistor. Unique reverse-battery n Laptop and Palmtop Computers protection circuitry limits reverse current to safe, non- n Cellular Telephones destructive levels at reverse supply voltages up to 1.6V. n Portable Instruments L, LTC, and LT are registered trademarks of Linear Technology Corporation. n 4mA to 20mA Loop Powered Instruments n Hand-Held Inventory Computers n Battery-Powered α, β, and γ Particle Detectors
TYPICAL APPLICATION Single Alkaline “AA” Cell Operating Single-Cell to 5V Converter Hours vs DC Load Current
CADDELL-BURNS 1000 7300-12 1N5818 82µH 5V 40mA 100 1 2 ILIM VIN 3 SW1 1.5V L = 180µH AA CELL* LT1073-5 10 8 SENSE + 100µF GND SW2 SANYO CONTINUOUS OPERATION (HOURS) 5 4 L = 82µH 0S-CON 1 OPERATES WITH CELL VOLTAGE ≥1V 1 10 100 ADD 10µF DECOUPLING CAPACITOR IF * LOAD CURRENT (mA) BATTERY IS MORE THAN 2" AWAY FROM LT1073 1073 TA01 LT1073 TA02 Rev B 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagrams Operation Applications Information Typical Applications Package Description Typical Application Related Parts
FEATURES DESCRIPTION
n No Design Required The LT®1073 is a versatile micropower DC/DC converter. The n Operates at Supply Voltages from 1V to 30V device requires only three external components to deliver n Consumes Only 95µA Supply Current a fixed output of 5V or 12V. The very low minimum supply n Works in Step-Up or Step-Down Mode voltage of 1V allows the use of the LT1073 in applications n Only Three External Off-the-Shelf Components where the primary power source is a single cell. An on-chip Required auxiliary gain block can function as a low-battery detector n Low-Battery Detector Comparator On-Chip or linear post-regulator. n User-Adjustable Current Limit Average current drain of the LT1073-5 used as shown in n Internal 1A Power Switch the Typical Application circuit below is just 135µA unloaded, n Fixed or Adjustable Output Voltage Versions making it ideal for applications where long battery life is n Space-Saving 8-Pin PDIP or SO-8 Package important. The circuit shown can deliver 5V at 40mA from an input as low as 1.25V and 5V at 10mA from a 1V input.
APPLICATIONS
The device can easily be configured as a step-up or step- n Pagers down converter, although for most step-down applications n Cameras or input sources greater than 3V, the LT1173 is recom- n Single-Cell to 5V Converters mended. Switch current limiting is user-adjustable by n Battery Backup Supplies adding a single external resistor. Unique reverse-battery n Laptop and Palmtop Computers protection circuitry limits reverse current to safe, non- n Cellular Telephones destructive levels at reverse supply voltages up to 1.6V. n Portable Instruments L, LTC, and LT are registered trademarks of Linear Technology Corporation. n 4mA to 20mA Loop Powered Instruments n Hand-Held Inventory Computers n Battery-Powered α, β, and γ Particle Detectors
TYPICAL APPLICATION Single Alkaline “AA” Cell Operating Single-Cell to 5V Converter Hours vs DC Load Current
CADDELL-BURNS 1000 7300-12 1N5818 82µH 5V 40mA 100 1 2 ILIM VIN 3 SW1 1.5V L = 180µH AA CELL* LT1073-5 10 8 SENSE + 100µF GND SW2 SANYO CONTINUOUS OPERATION (HOURS) 5 4 L = 82µH 0S-CON 1 OPERATES WITH CELL VOLTAGE ≥1V 1 10 100 ADD 10µF DECOUPLING CAPACITOR IF * LOAD CURRENT (mA) BATTERY IS MORE THAN 2" AWAY FROM LT1073 1073 TA01 LT1073 TA02 Rev B 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagrams Operation Applications Information Typical Applications Package Description Typical Application Related Parts
