Maker : Linear Technology
Part No. : LT1173-12

Datasheet PDF : LT1173-12.pdf
Cross Reference : LT1173-12 Cross Reference
Buy Component : LT1173-12 Find Stock and Price

Shortcut : LT1173-12 

Product Information

LT1173 Micropower DC/DC Converter Adjustable and Fixed 5V, 12V FEATURES s s s s s s s s s DESCRIPTIO Operates at Supply Voltages From 2.0V to 30V Consumes Only 110µA Supply Current Works in Step-Up or Step-Down Mode Only Three External Components Required Low Battery Detector Comparator On-Chip User-Adjustable Current Limit Internal 1A Power Switch Fixed or Adjustable Output Voltage Versions Space Saving 8-Pin MiniDIP or SO8 Package The LT1173 is a versatile micropower DC-DC converter. The device requires only three external components to deliver a fixed output of 5V or 12V. Supply voltage ranges from 2.0V to 12V in step-up mode and to 30V in step-down mode. The LT1173 functions equally well in step-up, stepdown or inverting applications. The LT1173 consumes just 110µA supply current at standby, making it ideal for applications where low quiescent current is important. The device can deliver 5V at 80mA from a 3V input in step-up mode or 5V at 200mA from a 12V input in step-down mode. Switch current limit can be programmed with a single resistor. An auxiliary gain block can be configured as a low battery detector, linear post regulator, under voltage lockout circuit or error amplifier. For input sources of less than 2V, use the LT1073. APPLICATI s s s s s s s s s S Flash Memory Vpp Generators 3V to 5V, 5V to 12V Converters 9V to 5V, 12V to 5V Converters LCD Bias Generators Peripherals and Add-On Cards Battery Backup Supplies Laptop and Palmtop Computers Cellular Telephones Portable Instruments and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation. TYPICAL APPLICATI L1* 100µH 5VIN 47Ω I LIM 10 µ F V IN SW1 S VPP Output 12V 100mA Logic Controlled Flash Memory VPP Generator 1N5818 VOUT 5V/DIV 1.07M† + + LT1173 FB SW2 SANYO OS-CON 100 µ F 0V GND 124k† PROGRAM 5V/DIV 5ms/DIV 1173 TA02 1N4148 PROGRAM LT1173 • TA01 *L1 = GOWANDA GA20-103K COILTRONICS CTX100-4 NO OVERSHOOT EFFICIENCY = 81% † = 1% METAL FILM U UO UO 1 LT1 173 ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO TOP VIEW ILIM 1 VIN 2 SW1 3 SW2 4 8 7 6 5 FB (SENSE)* SET AO GND Supply Voltage (VIN) ................................................ 36V SW1 Pin Voltage (VSW1) .......................................... 50V SW2 Pin Voltage (VSW2) ............................. – 0.5V to VIN Feedback Pin Voltage (LT1173) ................................. 5V Sense Pin Voltage (LT1173, -5, -12) ....................... 36V Maximum Power Dissipation ............................. 500mW Maximum Switch Current ....................................... 1.5A Operating Temperature Range ..................... 0°C to 70°C Storage Temperature Range .................. –65°C to 150°C Lead Temperature, (Soldering, 10 sec.)................ 300°C Consult factory for Industrial and Military grade parts ORDER PART NUMBER LT1173CN8 LT1173CN8-5 LT1173CN8-12 N8 PACKAGE 8-LEAD PLASTIC DIP *FIXED VERSIONS TJMAX = 90°C, θJA = 130°C/W TOP VIEW ILIM 1 VIN 2 SW1 3 SW2 4 8 FB (SENSE)* 7 SET 6 AO 5 GND LT1173CS8 LT1173CS8-5 LT1173CS8-12 S8 PART MARKING 1173 11735 117312 S8 PACKAGE 8-LEAD PLASTIC SOIC *FIXED VERSIONS TJMAX = 90°C, θJA = 150°C/W ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 3V, unless otherwise noted. SYMBOL IQ IQ VIN PARAMETER Quiescent Current Quiescent Current, Boost Mode Configuration Input Voltage Comparator Trip Point Voltage VOUT Output Sense Voltage Comparator Hysteresis Output Hysteresis fOSC tON Oscillator Frequency Duty Cycle Switch ON Time Feedback Pin Bias Current Set Pin Bias Current VOL Gain Block Output Low Reference Line Regulation VSAT SWSAT Voltage, Step-Up Mode Full Load ILIM tied to VIN LT1173, VFB = 0V VSET = VREF ISINK = 100µA, VSET = 1.00V 2.0V ≤ VIN ≤ 5V 5V ≤ VIN ≤ 30V VIN = 3.0V, ISW = 650mA VIN = 5.0V, ISW = 1A q CONDITIONS Switch Off No Load Step-Up Mode Step-Down Mode LT1173 (Note 1) LT1173-5 (Note 2) LT1173-12 (Note 2) LT1173 LT1173-5 LT1173-12 LT1173-5 LT1173-12 q...

Link URL