LTC3307A

RECOMMENDED FOR NEW DESIGNS

5V, 3A Synchronous Step-Down Silent Switcher in 2mm × 2mm LQFN and 1.6mm x 1.6mm WLCSP 

Data Sheet (Rev. E)
Part Models
19
1ku List Price
Starting From $1.08
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Part Details

  • Pin Compatible with LTC3308(4A) and LTC3309(6A)
  • High Efficiency: 8mΩ NMOS, 31mΩ PMOS
  • Programmable Frequency 1MHz to 3MHz
    • Tiny Inductor and Capacitors
  • Peak Current Mode Control
    • 22ns Minimum On-Time
    • Wide Bandwidth, Fast Transient Response
  • Silent Switcher® Architecture
    • Ultralow EMI Emissions
  • Low Ripple Burst Mode® Operation with IQ of 40µA
  • Safely Tolerates Inductor Saturation in Overload
  • VIN Range: 2.25V to 5.5V
  • VOUT Range: 0.5V to VIN
  • VOUT Accuracy: ±1% Over Temperature Range
  • Precision 400mV Enable Threshold, 1µA in Shutdown
  • Power Good, Internal Compensation and Soft Start
  • Thermally Enhanced 12-Lead 2mm × 2mm LQFN and 16-Pin 1.64mm × 1.64mm WLCSP Packages
  • AEC-Q100 Qualified for Automotive Applications
LTC3307A
5V, 3A Synchronous Step-Down Silent Switcher in 2mm × 2mm LQFN and 1.6mm x 1.6mm WLCSP 
LTC3307A Application Circuit LTC3307A Performance Graph LTC3307A Pin Configuration
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Technical Articles 1

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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3307A
  • LTC3307B

LTpowerCAD 1

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
DC2990A

LTC3307A | 5V Input to 1.2V Output at 3A Synchronous Step‑Down Silent Switcher Demo Circuit

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Product Details

Demonstration circuit 2990A features the LTC3307A 5V, 3A synchronous step-down Silent Switcher® operating as a 2MHz, 3.3V to 1.2V 3A buck regulator. The LTC3307A supports adjustable output voltages from 0.5V to VIN with operating frequencies from 1MHz up to 3MHz. The LTC3307A is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. A minimum on-time of 22ns enables high VIN to low VOUT conversion ratios at high frequencies.

The DC2990A operating mode may be selected as Burst, Skip or forced continuous (FC) mode. Setting JP1 to the FC/SYNC position will allow the LTC3307A to sync to a clock frequency from 1MHz to 3MHz. The LTC3307A operates in forced continuous mode when syncing to an external clock. The DC2990A is set to a fixed 2MHz frequency by connecting RT to VIN through a 0Ω resistor, R9. The frequency can be easily changed by removing R9 and setting an appropriate resistor in the R4 location to obtain the desired frequency. Refer to the LTC3307A data sheet for the proper RT value for a desired switching frequency.

The DC2990A also has an EMI filter to reduce conducted EMI. This EMI filter can be included by applying the input voltage at the VIN EMI terminal. The EMI performance of the board is shown in the EMI Test Results section. The red lines in the EMI performance graphs illustrate the CISPR25 Class 5 peak limits for the conducted and radiated emission tests.

The LTC3307A data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with this demo manual. The LTC3307A is assembled in a 2mm × 2mm LQFN package with exposed pads for low thermal resistance. The layout recommendations for low EMI operation and maximum thermal performance are available in the data sheet section Low EMI PCB Layout.

The Efficiency vs Load graph shows the efficiency and the power loss of the circuit with a 3.3V input in Burst Mode operation.
DC2990A
LTC3307A | 5V Input to 1.2V Output at 3A Synchronous Step‑Down Silent Switcher Demo Circuit
DC2990A DC2990A DC2990A
DC3122A
DC3122A Evaluation Board DC3122A Evaluation Board - Top View DC3122A Evaluation Board - Bottom View

Reference Designs

Artix US+ Rail Consolidation – Minimum Rails (AU10P/15P) Power Tree
Artix US+ Rail Consolidation – Minimum Rails (AU10P/15P) Power Tree
Artix US+ Rail Consolidation - Minimum Rails (AU20P/25P) Power Tree
Artix UltraScale+ Circuits from the lab

Minimum Rails for AU10/15P and AU20/25P - Non-Hardware Verified Design

View Detailed Reference Design

Features and Benefits

  • Xilinx Artix® UltraScale+™ devices are the industry’s only cost-optimized FPGAs based on an advanced, production-proven 16nm architecture for best-in-class performance/watt.

  • Analog Devices, Inc. supports power delivery solutions for the Artix Ultrascale+ low-cost designs. Monolithic solutions are used to power Xilinx FPGA and/or SoC rails as well as other system rails. These regulators are highly integrated discrete solutions optimized for cost, efficiency and footprint.

  • ADI provides supporting documentation including power schematics, layout, LTpowerPlanner® and applicable LTpowerPlay® configuration files to enable you to validate the power solution for your application seamlessly.

  • For a complete list power designs and use cases, please contact your local FAE.

  • Key Power for full management devices are used as follows:

    • LTC3307A
    • LTC3309A
    • ADP125
    • LTC3617 (Optional DDR)
    • LTC3618
    • ADM1186 (Optional Monitoring & Sequencing)
Knightrider Zynq Ultrascale +MPSOC Automotive Power Delivery Board​ - Top View
Knightrider Zynq Ultrascale +MPSOC Automotive Power Delivery Board​ - Top View
Knightrider Zynq Ultrascale +MPSOC Automotive Power Delivery Board​ - Bottom View
Knightrider Zynq Ultrascale +MPSOC Power Tree
Knightrider Zynq Ultrascale+ MPSOC Circuits from the lab

Automotive ASIL-D Compliant Power Delivery Board

View Detailed Reference Design

Features and Benefits

Xilinx Zynq® UltraScale+™ devices are the industry’s only cost-optimized FPGAs based on an advanced, production-proven 16nm architecture for best-in-class performance/watt.

Analog Devices, Inc. supports ASIL-D compliant automotive power delivery solutions for the Xilinx Zynq UltraScale+ MPSOC. The Knightrider board demonstrates the best-in-class power management supporting ASIL-D compliant solutions for functional safety.

Monolithic solutions are used to power Xilinx FPGA and/or SoC rails as well as other system rails. These regulators are highly integrated discrete solutions optimized for cost, efficiency and foot print.

ADI provides supporting documentation including power schematics, layout, LTpowerPlanner® and applicable LTpowerPlay® configuration files to enable you to validate the power solution for your application seamlessly.

For a complete list power designs and use cases, please contact your local FAE.

Key Power for full management devices are used as follows:

  • LT8672
  • LTC4365
  • MAX20410
  • MAX20478
  • MAX20438
  • LTC3307
  • MAX25229
  • MAX17510
Artix UltraScale+
Minimum Rails for AU10/15P and AU20/25P - Non-Hardware Verified Design
Artix US+ Rail Consolidation – Minimum Rails (AU10P/15P) Power Tree
Artix US+ Rail Consolidation - Minimum Rails (AU20P/25P) Power Tree
Knightrider Zynq Ultrascale+ MPSOC
Automotive ASIL-D Compliant Power Delivery Board
Knightrider Zynq Ultrascale +MPSOC Automotive Power Delivery Board​ - Top View
Knightrider Zynq Ultrascale +MPSOC Automotive Power Delivery Board​ - Bottom View
Knightrider Zynq Ultrascale +MPSOC Power Tree

Latest Discussions

2 Years Ago
RE: LTC3307A Feedback Voltage Tolerance
2 Years Ago
RE: Strike LTC3307A with a voltage > 6V
View related discussion on EngineerZone®

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