LTC3545
LTC3545-1
Info: : PRODUCTION
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LTC3545
LTC3545-1

Triple 800mA Synchronous Step-Down Regulator - 2.25MHz

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Models 8
1ku List Price Starting From $3.72
Features
  • Three 800mA Outputs
  • High Efficiency: Up to 95%
  • 2.25V to 5.5V Input Voltage Range
  • Low Ripple (<20mVP-P) Burst Mode® Operation IQ: 58uA
  • 2.25MHz Constant Frequency Operation
  • Synchronizable to External 1MHz to 3MHz Clock
  • Power Good Indicators Ease Supply Sequencing
  • 0.6V Reference Allows Low Output Voltages
  • Current Mode Operation/Excellent Transient Response
  • Low Profile 16-Lead 3mm × 3mm QFN Package
Additional Details
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The LTC3545/LTC3545-1 are triple, high efficiency, monolithic synchronous buck regulators using a constant frequency, current mode architecture. The regulators operate independently with separate run pins. The 2.25V to 5.5V input voltage range makes the LTC3545/LTC3545-1 well suited for single Li-Ion battery-powered applications. Low ripple pulse skip mode or high efficiency Burst Mode operation is externally selectable. PWM pulse skip mode operation provides very low output ripple voltage while Burst Mode operation increases efficiency at low output loads.

Switching frequency is internally set to 2.25MHz, or the switching frequency can be synchronized to an external 1MHz to 3MHz clock. Power good indicators easily allow power on sequencing between the three regulators.

The internal synchronous switches increase efficiency and eliminate external Schottky diodes. Low output voltages are supported with the 0.6V feedback reference voltage.

The LTC3545-1 replaces the SYNC/MODE function with a third PGOOD pin and forces Burst Mode operation.

Applications

  • Smart Phones
  • Wireless and DSL Modems
  • Digital Still Cameras
  • Portable Instruments
  • Point of Load Regulation
Part Models 8
1ku List Price Starting From $3.72

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Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3545EUD#PBF
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LTC3545EUD#TRPBF
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LTC3545EUD-1#PBF
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LTC3545EUD-1#TRPBF
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LTC3545IUD#PBF
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LTC3545IUD#TRPBF
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LTC3545IUD-1#PBF
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LTC3545IUD-1#TRPBF
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Software & Part Ecosystem

Evaluation Kits 2

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DC1193A-B

LTC3545EUD Demo Board | 2.25V to 5.5VIN, 1.2V @ 0.8A, 1.5V @ 0.8A, 1.8V @ 0.8A; PGOOD Pin, Burst Mode Only

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DC1193A-B

LTC3545EUD Demo Board | 2.25V to 5.5VIN, 1.2V @ 0.8A, 1.5V @ 0.8A, 1.8V @ 0.8A; PGOOD Pin, Burst Mode Only

LTC3545EUD Demo Board | 2.25V to 5.5VIN, 1.2V @ 0.8A, 1.5V @ 0.8A, 1.8V @ 0.8A; PGOOD Pin, Burst Mode Only

Product Detail

Demonstration circuit 1193 is a triple output regulator consisting of three constant-frequency step-down converters integrated into LTC3545/-1. DC1193 has an input voltage range of 2.25V to 5.5V, with regulators capable of delivering 800mA of load current on each output. The three regulators operate independently with individual RUN pins and enter pulse skipping mode at low loads for reducing output ripple. In shutdown, the DC1193 draws less than 1uA total. The DC1193 is a very efficient circuit with efficiency reading above 90%. The LTC3545 comes in a 16-pin QFN package, which has an exposed pad on the bottomside of the IC for better thermal performance. High operating frequency of 2.25MHz allows exclusive use of the small size, low profile surface mount components. These features plus internal compensation circuits, make the DC1193 demo board an ideal circuit for use in battery-powered, hand-held applications. DC1193A-A is a demoboard for LTC3545 and DC1193A-B is a demoboard for LCT3545-1.

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DC1193A-A

LTC3545EUD Demo Board | 2.25V to 5.5VIN, 1.2V @ 0.8A, 1.5V @ 0.8A, 1.8V @ 0.8A; Synchronous Pin

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DC1193A-A

LTC3545EUD Demo Board | 2.25V to 5.5VIN, 1.2V @ 0.8A, 1.5V @ 0.8A, 1.8V @ 0.8A; Synchronous Pin

LTC3545EUD Demo Board | 2.25V to 5.5VIN, 1.2V @ 0.8A, 1.5V @ 0.8A, 1.8V @ 0.8A; Synchronous Pin

Product Detail

Demonstration circuit 1193 is a triple output regulator consisting of three constant-frequency step-down converters integrated into LTC3545/-1. DC1193 has an input voltage range of 2.25V to 5.5V, with regulators capable of delivering 800mA of load current on each output. The three regulators operate independently with individual RUN pins and enter pulse skipping mode at low loads for reducing output ripple. In shutdown, the DC1193 draws less than 1uA total. The DC1193 is a very efficient circuit with efficiency reading above 90%. The LTC3545 comes in a 16-pin QFN package, which has an exposed pad on the bottomside of the IC for better thermal performance. High operating frequency of 2.25MHz allows exclusive use of the small size, low profile surface mount components. These features plus internal compensation circuits, make the DC1193 demo board an ideal circuit for use in battery-powered, hand-held applications. DC1193A-A is a demoboard for LTC3545 and DC1193A-B is a demoboard for LCT3545-1.

Tools & Simulations 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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