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Linear Technology Corporation

Linear Technology Corporation. LT3070 Backgrounder Steve Knoth Senior Product Marketing Engineer. Agenda. Background Past Limitations for LDOs Powering FPGAs/ASICs Advantages of Next Gen Linear Tech LDOs LT3070 Definition Features & Benefits Application Circuits Target Markets

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Linear Technology Corporation

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  1. Linear Technology Corporation LT3070 Backgrounder Steve KnothSenior Product Marketing Engineer

  2. Agenda Background • Past Limitations for LDOs Powering FPGAs/ASICs • Advantages of Next Gen Linear Tech LDOs LT3070 • Definition • Features & Benefits • Application Circuits • Target Markets • Target Applications

  3. Power Business Unit • Products: • Switching Regulators, DC/DC Controllers, Charge-Pumps, Linear Regulators, Battery Chargers, PMICs, LED Drivers, DC Power Switches • Markets: • Handheld Battery Powered Products – Cell Phones, Digital Still Cameras, PDAs, MP3 Players, PNDs, etc. • Industrial Control and Instrumentation • Automotive – Navigation and Infotainment • Telecommunications – Infrastructure • Computer – Servers, Workstations and Notebook PC

  4. Traditional Limitations for in Powering FPGAs/DSPs/ASICs/µPs For high-performance digital ICs such as FPGAs, DSPs, µP’s, µC’s and ASICs, the trend is for higher currents and lower voltages. More efficient, switching regulators have traditionally been used to power these devices but there are noise and layout limitations, so LDOs have come into play. The LDO must have: • Operation over a wide input/output voltage range • High output current capability • Low output noise • Low dropout operation • Excellent thermal performance • Fast response time • High PSRR • System debugging features a “+” plus X X X X X X X X

  5. LT3070: What is It? UltraFast™ 5A LDO

  6. LT3070: What is It? UltraFast 5A LDO 5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator • New NMOS LDO Family: Low Noise, Programmable Output, High BW • Wide VIN Range: 0.95V to 3V • Ultra-Low Output Voltage Noise: 25µVRMS (10Hz to 100kHz) • Wide VOUT Range: 0.8V to 1.8V in 50mV increments • Fast Transient Response • Digital Margining for System Debug

  7. LT3070: Block Diagram The LT3070’s architecture drives an internal N-channel power MOSFET as a source follower. This configuration permits a user to realize an extremely low dropout, ultra- fast transient response regulator with excellent high frequency PSRR performance.

  8. LT3070: Key Technical Features * • Output Current: 5A • Dropout Voltage: 85mV Typical • Digitally Programmable VOUT: 0.8V to 1.8V in 50mV steps • Digital Output Margining: ±1%, ±3% or ±5% • ±1% Accuracy Over Line, Load and Temperature (Initial = 0.2%) • Low Output Noise: 25μVRMS (10Hz to 100kHz) • Parallelable: Use Two for a 10A Output • 28-Lead (4mm × 5mm) QFN Package * Specifications subject to change

  9. LT3070: Other Features * • Stable with Low ESR Ceramic Output Capacitors (15μF Min) • High Frequency PSRR: 30dB at 1MHz • VIOC Pin Controls Upstream Buck Converter to Maintain Low Power Dissipation and Optimize Efficiency • PWRGD/UVLO Flag • REF/BYP Pin: Single Cap provides programmable soft-start and lowers output noise • Enable Function Turns Output On/Off • Current Limit Foldback Protection • Thermal Shutdown * Specifications subject to change

  10. LT3070: Features & Benefits

  11. LT3070: Package/Pinout

  12. LT3070 Typical Application Circuit Power Good Indicator Pin-selectable VOUT Small Output Caps!!! Soft Start Control Digital Margining Select

  13. LT3070 Post-Buck Regulator Application V 3.3V BIAS SGND 2.2µF W 1 47µF 100pF 50K 6.3V (x3) 50K PGOOD 0.1µF CLKOUT RUN PV PV BIAS SV I I IN IN IN THM TH SENSE EN NC NC V 1.0V / 5A OUT 15K LOAD OUT IN L T3070 TRACK SGND 15K 47µF VO2 PLLLPF V FB PWRGD NC VO1 PV PV IN IN 2.2 + 4.7 + 10µF 10pF 100pF 20K NC VO0 X7R, 0805 PV PV IN IN NC MARGTOL SW SW TC3415EUHF L NC MARGSEL SW SW SW SW REF/BYP VIOC 0.01µF GND SW SW X7R 2K MODE PGOOD PGND CLKIN BSEL 4.7nF PHMODE MGN PGND PGND PGND PGND PGND PGND PGND 100µF, 6.3V (x3) 1.3V / 7A Notes: 0.2µH L TC3415 Switcher 2MHz internal oscillator Optimal Efficiency across LDO Maintain a constant “VIN – VOUT” across the LDO by adjusting the VITH / VC pin regulation point

  14. LT3070 Current Sharing Application Achieve 10A load current capability…or more!

  15. LT3070: Typical Applications/Target End Markets • FPGA and DSP Supplies • ASIC and Microprocessor Supplies • Servers and Storage Devices • Sensitive Communication Supplies • Supply Isolation • Post Buck Regulation

  16. LT3070: Conclusion • Requirements for LDOs Powering High Performance Digital ICs: • Operation over a wide input/output voltage range with high output current capability • Low output noise • Low dropout operation • Excellent thermal performance • Fast response time and high PSRR • System debugging features a “+” plus • LT3070 UltraFast 5A Ultra-Low Dropout, Low Noise LDO: • Dropout Voltage: 85mV Typical • Digitally Programmable VOUT: 0.8V to 1.8V • Digital Output Margining: ±1%, ±3% or ±5% • ±1% Accuracy Over Line, Load and Temperature • Low Output Noise: 25μVRMS (10Hz to 100kHz) • Parallelable: Use Two for a 10A Output • 28-Lead (4mm × 5mm) QFN Package

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