Datasheet LT8580 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Boost/SEPIC/Inverting DC/DC Converter with 1A, 65V Switch, Soft-Start and Synchronization |
| Pages / Page | 32 / 1 — FEATURES. DESCRIPTION. 1A, 65V Power Switch. Adjustable Switching … |
| Revision | B |
| File Format / Size | PDF / 1.4 Mb |
| Document Language | English |
FEATURES. DESCRIPTION. 1A, 65V Power Switch. Adjustable Switching Frequency. Single Feedback Resistor Sets VOUT
Model Line for this Datasheet
Text Version of Document
LT8580 Boost/SEPIC/Inverting DC/DC Converter with 1A, 65V Switch, Soft-Start and Synchronization
FEATURES DESCRIPTION
n
1A, 65V Power Switch
The LT®8580 is a PWM DC/DC converter containing an n
Adjustable Switching Frequency
internal 1A, 65V switch. The LT8580 can be configured n
Single Feedback Resistor Sets VOUT
as either a boost, SEPIC or inverting converter. n
Synchronizable to External Clock
The LT8580 has an adjustable oscillator, set by a resistor n High Gain SHDN Pin Accepts Slowly Varying from the RT pin to ground. Additionally, the LT8580 can be Input Signals synchronized to an external clock. The switching frequency n Wide Input Voltage Range: 2.55V to 40V of the part may be free running or synchronized, and can n Low VCESAT Switch: 400mV at 0.75A (Typical) be set between 200kHz and 1.5MHz. n Integrated Soft-Start Function n Easily Configurable as a Boost, SEPIC, or Inverting The LT8580 also features innovative SHDN pin circuitry Converter that allows for slowly varying input signals and an adjust- n User Configurable Undervoltage Lockout (UVLO) able undervoltage lockout function. n Pin Compatible with LT3580 Additional features such as frequency foldback and n Tiny Thermally Enhanced 8-Lead 3mm × 3mm DFN soft-start are integrated. The LT8580 is available in tiny and 8-Lead MSOP Packages thermally enhanced 3mm × 3mm 8-lead DFN and 8-lead n AEC-Q100 Qualification in Progress MSOP packages.
APPLICATIONS
All registered trademarks and trademarks are the property of their respective owners. n VFD Bias Supplies n TFT-LCD Bias Supplies n GPS Receivers n DSL Modems n Local Power Supply
TYPICAL APPLICATION 1.5MHz, 5V to 12V Boost Converter Efficiency and Power Loss
100 480 15µH VOUT VIN 12V 5V 90 420 200mA 10k 80 360 POWER LOSS (mW) VIN SW 70 300 130k SHDN FBX 4.7µF 60 240 2.2µF LT8580 SYNC VC EFFICIENCY (%) 50 180 6.04k 40 120 RT GND SS 47pF 30 EFFICIENCY 60 56.2k 0.22µF 3.3nF POWER LOSS 8580 TA01a 20 0 0 50 100 150 200 LOAD CURRENT (mA) 8580 TA01b Rev. B Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
FEATURES DESCRIPTION
n
1A, 65V Power Switch
The LT®8580 is a PWM DC/DC converter containing an n
Adjustable Switching Frequency
internal 1A, 65V switch. The LT8580 can be configured n
Single Feedback Resistor Sets VOUT
as either a boost, SEPIC or inverting converter. n
Synchronizable to External Clock
The LT8580 has an adjustable oscillator, set by a resistor n High Gain SHDN Pin Accepts Slowly Varying from the RT pin to ground. Additionally, the LT8580 can be Input Signals synchronized to an external clock. The switching frequency n Wide Input Voltage Range: 2.55V to 40V of the part may be free running or synchronized, and can n Low VCESAT Switch: 400mV at 0.75A (Typical) be set between 200kHz and 1.5MHz. n Integrated Soft-Start Function n Easily Configurable as a Boost, SEPIC, or Inverting The LT8580 also features innovative SHDN pin circuitry Converter that allows for slowly varying input signals and an adjust- n User Configurable Undervoltage Lockout (UVLO) able undervoltage lockout function. n Pin Compatible with LT3580 Additional features such as frequency foldback and n Tiny Thermally Enhanced 8-Lead 3mm × 3mm DFN soft-start are integrated. The LT8580 is available in tiny and 8-Lead MSOP Packages thermally enhanced 3mm × 3mm 8-lead DFN and 8-lead n AEC-Q100 Qualification in Progress MSOP packages.
APPLICATIONS
All registered trademarks and trademarks are the property of their respective owners. n VFD Bias Supplies n TFT-LCD Bias Supplies n GPS Receivers n DSL Modems n Local Power Supply
TYPICAL APPLICATION 1.5MHz, 5V to 12V Boost Converter Efficiency and Power Loss
100 480 15µH VOUT VIN 12V 5V 90 420 200mA 10k 80 360 POWER LOSS (mW) VIN SW 70 300 130k SHDN FBX 4.7µF 60 240 2.2µF LT8580 SYNC VC EFFICIENCY (%) 50 180 6.04k 40 120 RT GND SS 47pF 30 EFFICIENCY 60 56.2k 0.22µF 3.3nF POWER LOSS 8580 TA01a 20 0 0 50 100 150 200 LOAD CURRENT (mA) 8580 TA01b Rev. B Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
