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Part Number: LTC1430A
Description: The LTC®1430A is a high power, high efficiency switching regulator controller optimized for 5V to 1.xV-3.xV applica...
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LTC1430A
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General Description
LTC1430A General Description
The LTC®1430A is a high power, high efficiency switching regulator controller optimized for 5V to 1.xV-3.xV applications. It includes a precision internal reference and an internal feedback system that can provide output regulation of ±1% over temperature, load current and line voltage shifts. The LTC-1430A uses a synchronous switching architecture with two N-channel output devices, eliminating the need for a high power, high cost P-channel device. Additionally, it senses output current across the drain-source resistance of the upper N-channel FET, providing an adjustable current limit without an external low value sense resistor.
The LTC1430A includes a fixed frequency PWM oscillator for low output ripple under virtually all operating conditions. The 200kHz free-running clock fre-quency can be externally adjusted from 100kHz to above 500kHz. The LTC1430A's maximum duty cycle is typically 93.5% compared to 88% for the LTC1430. This permits 3.3V to 2.xV conversion using a low power 5V supply. The LTC1430A features low 350µA quiescent current, allowing greater than 90% efficiency op-eration in converter designs from 1A to greater than 50A output current. Shutdown mode drops the LTC1430A supply current to 1µA.
LTC1430A Maximum Ratings
Supply VoltageVCC ........................................................................ 9V
PVCC1, 2 ...................................................................................... 13V
Input VoltageIFB ........................................................... 0.3V to 18V
All Other Inputs ............................................... 0.3V to (VCC + 0.3V)
Junction Temperature................................................................ 150°C
Operating Temperature Range
LTC1430AC ............................................. 0°C to 70°C
LTC1430AI ........................................ 40°C to 85°C
Storage Temperature Range .................................. 65°C to 150°C
Lead Temperature (Soldering, 10 sec) ..................................... 300°C
PVCC1, 2 ...................................................................................... 13V
Input VoltageIFB ........................................................... 0.3V to 18V
All Other Inputs ............................................... 0.3V to (VCC + 0.3V)
Junction Temperature................................................................ 150°C
Operating Temperature Range
LTC1430AC ............................................. 0°C to 70°C
LTC1430AI ........................................ 40°C to 85°C
Storage Temperature Range .................................. 65°C to 150°C
Lead Temperature (Soldering, 10 sec) ..................................... 300°C
LTC1430A Features
High Power 5V to 1.xV-3.xV Switching Controller:Can Exceed 10A Output
Maximum Duty Cycle > 90% Permits 3.3V to 2.xV Conversion Using a Low Power 5V Supply
All N-Channel External MOSFETs
Fixed Frequency Operation-Small L
Excellent Output Regulation: ±1% Over Line, Load and Temperature Variations
High Efficiency: Over 95% Possible
No Low Value Sense Resistor Needed
Outputs Can Drive External FETs with Up to 10,000pF Gate Capacitance
Quiescent Current: 350µA Typ, 1µA in Shutdown
Fast Transient Response
Adjustable or Fixed 3.3V Output
Available in 8-Lead SO and 16-Lead GN and SO Packages
Maximum Duty Cycle > 90% Permits 3.3V to 2.xV Conversion Using a Low Power 5V Supply
All N-Channel External MOSFETs
Fixed Frequency Operation-Small L
Excellent Output Regulation: ±1% Over Line, Load and Temperature Variations
High Efficiency: Over 95% Possible
No Low Value Sense Resistor Needed
Outputs Can Drive External FETs with Up to 10,000pF Gate Capacitance
Quiescent Current: 350µA Typ, 1µA in Shutdown
Fast Transient Response
Adjustable or Fixed 3.3V Output
Available in 8-Lead SO and 16-Lead GN and SO Packages
LTC1430A Typical Application
Power Supply for Pentium®II and AMD-K6®
Microprocessors
High Power 5V to 3.xV Regulators
Local Regulation for Dual Voltage Logic Boards
Low Voltage, High Current Battery Regulation
Microprocessors
High Power 5V to 3.xV Regulators
Local Regulation for Dual Voltage Logic Boards
Low Voltage, High Current Battery Regulation
LTC1430A Connection Diagram
LTC1430A
PDF/DataSheet Download
- Datasheet: LTC1430A
- File Size: 435133 KB
- Manufacturer: Linear
- Click here to Download
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