LTC3315A

RECOMMENDED FOR NEW DESIGNS

Dual 5V, 2A Synchronous Step-Down DC/DCs in Tiny LQFN and WLCSP

Data Sheet (Rev. B) Product Selection Table
Part Models
19
1ku List Price
Starting From $1.03
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Part Details

  • Dual Outputs Each with 2A Output Current
  • High Efficiency: 19mΩ NMOS and 75mΩ PMOS
  • Wide Bandwidth, Fast Transient Response
  • Switching Frequency Synchronizable Up to 3MHz
  • VIN Range: 2.25V to 5.5V
  • VOUT Range: 0.5V to VIN
  • VOUT Accuracy: ±1%
  • Low Ripple Burst Mode® Operation
  • Peak Current Mode Control
  • Minimum On-Time: 25ns
  • Safely Tolerates Inductor Saturation in Overload
  • Shutdown Current: 1.2µA
  • Precision 400mV Enable Thresholds
  • Internal Soft-Start and Compensation
  • Power Good Output
  • Low Profile, Thermally Enhanced 12-Lead 2mm × 2mm × 0.74mm LQFN and 16-Ball 1.64mm × 1.64mm × 0.5mm WLCSP Packages
  • AEC-Q100 Qualified for Automotive Applications
LTC3315A
Dual 5V, 2A Synchronous Step-Down DC/DCs in Tiny LQFN and WLCSP
LTC3315A Application Circuit LTC3315A Performance Graph LTC3315A 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:

  • LTC3315A
  • LTC3315B

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
DC2747A

LTC3315A Demo Board | Dual 5V, 2A Synchronous Step-Down DC/DCs in 2mm × 2mm LQFN 

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Product Details

Demonstration Circuit DC2747A features the LTC3315A dual 5V, 2A Synchronous Step-Down DC/DC regulators operating at 2.0MHz. One regulator provides a 1.2V output and the other provides 1.8V, both up to a 2A load. The LTC3315A supports adjustable output voltages from 0.5V to VIN, operating frequencies from 1MHz up to 3MHz. The LTC3315A is a compact, high efficiency, and high speed synchronous monolithic step-down switching regulator. Fast minimum on-time of 25ns enables high VIN to low VOUT conversion at high frequency.

The DC2747A operating mode may be selected as Burst Mode operation, Skip mode or Forced Continuous (FC) mode. Setting JP1 to the FC/SYNC position will allow the LTC3315A to sync to a clock frequency from 1MHz to 3MHz. The LTC3315A operates in Forced Continuous mode when syncing to an external clock.

The LTC3315A data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with this demo. The LTC3315A is assembled in a 2mm × 2mm LQFN package with exposed pads for low thermal resistance. The PCB Considerations section in the data sheet.

The Efficiency vs Load graph shows the efficiency and the power loss of the circuit with a 3.3V input in Burst Mode operation.

eval board
schematic 4
schematic 5
schematic 6
DC3123A

LTC3315A | 3.3V VIN, Dual 2A, 2MHz Buck Regulators at 1.2V and 1.8V Outputs in a 74mm2 Solution

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Product Details

Demonstration Circuit DC3123A features the LTC3315A dual 5V, 2A Synchronous Step-Down DC/DC regulators operating at 2MHz. One regulator provides a 1.2V output and the other provides 1.8V, both up to a 2A load. The LTC3315A supports adjustable output voltages from 0.5V to VIN, operating frequencies from 1MHz up to 3MHz. The LTC3315A is a compact, high efficiency, and high speed synchronous monolithic step-down switching regulator. Fast minimum on-time of 25ns enables high VIN to low VOUT conversion at high frequency.

The DC3123A operating mode may be selected as Burst Mode operation, Skip mode or Forced Continuous (FC) mode. Setting JP1 to the FC/SYNC position will allow the LTC3315A to sync to a clock frequency from 1MHz to 3MHz. The LTC3315A operates in Forced Continuous mode when syncing to an external clock.

The LTC3315A data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with the demo manual. The LTC3315A is assembled in a 1.6mm × 1.6mm WLCSP package.

The Efficiency vs Load graph shows the efficiency and the power loss of the circuit with a 3.3V input in Burst Mode operation.
DC2747A
LTC3315A Demo Board | Dual 5V, 2A Synchronous Step-Down DC/DCs in 2mm × 2mm LQFN 
DC2747A Image DC2747A Application Circuit DC2747A Performance Graph
DC3123A
LTC3315A | 3.3V VIN, Dual 2A, 2MHz Buck Regulators at 1.2V and 1.8V Outputs in a 74mm2 Solution
DC3123A Evaluation Board DC3123A Evaluation Board - Top View DC3123A Evaluation Board - Bottom View

Latest Discussions

2 Years Ago
RE: Handling of unused pins of LTC3315A
3 Years Ago
RE: LTC3315A, LTC3315B MODE/SYNC select mode
View related discussion on EngineerZone®

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