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IC manufacturers ADI Power by Linear

IC manufacturers (84)

ADI Power by Linear LT3514

Triple Step-Down Switching Regulator with 100% Duty Cycle Operation

Overview

TopologyBuck Converter
Input voltage3.2-36 V
Switching frequency220-2400 kHz
Output 11 A
Output 21 A
Output 32 A
IC revisionA

Description

The LT®3514 consists of three buck regulators (2A, 1A, 1A output current). The device has a wide operating input range of 3.2V to 36V. An on-chip boost regulator allows each channel to operate up to 100% duty cycle. The LT3514 is designed to minimize external component count and results in a simple and small application circuit.

The LT3514 operates robustly in fault conditions. Cycleby- cycle peak current limit and catch diode current limit sensing protect the IC during overload conditions. Thermal shutdown protects the power switches at elevated temperatures. Soft-start helps control the peak inductor current during startup.

The LT3514 also features output voltage tracking and sequencing, programmable frequency, programmable undervoltage lockout, and a power good pin to indicate when all outputs are in regulation.

The LT3514 has one fewer channel (CH2) than the LT3504, and has one channel (CH3) that outputs 2A instead of 1A. The LT3514 in QFN is pin compatible with the LT3504. The LT3504 provides four 1A outputs.

Features

  • Wide Input Voltage Range: 3.2V to 36V (40V Transient)
  • Three Outputs: 2A, 1A, 1A
  • 100% Duty Cycle Operation
  • Resistor-Programmed Constant Frequency
  • Short-Circuit Robust
  • Wide SYNC Range: 350kHz to 2.2MHz
  • Anti-Phase Switching Reduces Ripple
  • Feedback Voltage: 800mV
  • Independent Run/Soft-Start Pins
  • Shutdown with UVLO
  • Internal Compensation
  • Thermal Shutdown
  • Tiny 28-Lead (4mm × 5mm) Thermally Enhanced QFN Package
  • 24-Lead Exposed Pad TSSOP

Remarks:

  • Refer page num 16 for more inductor values.

Typical applications

  • Wall Transformer Regulation
  • Automotive Battery Regulation
  • Distributed Supply Regulation
  • Industrial Control Supplies

Products

Order Code Data­sheet Simu­lation Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC
(mΩ)
fres
(MHz)
MountRDC max.
(mΩ)
SizeVersion Samples
744042001SPEC
8 files WE-TPC SMT Tiny Power Inductor 1 2.7 2.6 20 177 SMT 30 4818 SMT
744778001SPEC
8 files WE-PD SMT Power Inductor 1 5.37 6.4 9 115 SMT 12 7332 Standard
7440430012SPEC
8 files WE-TPC SMT Tiny Power Inductor 1.2 3.1 2.8 17 150 SMT 20 4828
7440420018SPEC
8 files WE-TPC SMT Tiny Power Inductor 1.8 2.35 2.4 40 100 SMT 50 4818 SMT
7440420027SPEC
8 files WE-TPC SMT Tiny Power Inductor 2.7 2.03 2.2 47 90 SMT 60 4818 SMT
744042003SPEC
8 files WE-TPC SMT Tiny Power Inductor 3.3 1.95 1.8 50 80 SMT 65 4818 SMT
744043003SPEC
8 files WE-TPC SMT Tiny Power Inductor 3.3 2.15 1.8 30 80 SMT 35 4828
744778003SPEC
8 files WE-PD SMT Power Inductor 3.3 3.1 4.1 24 61 SMT 32 7332 Standard
744774033SPEC
8 files WE-PD2 SMT Power Inductor 3.3 4 7.5 42 43 SMT 60 5848
7440420039SPEC
8 files WE-TPC SMT Tiny Power Inductor 3.9 1.82 1.7 60 70 SMT 75 4818 SMT
744042004SPEC
8 files WE-TPC SMT Tiny Power Inductor 4.7 1.72 1.65 70 70 SMT 82 4818 SMT
744043004SPEC
8 files WE-TPC SMT Tiny Power Inductor 4.7 1.55 1.7 50 60 SMT 70 4828
744778004SPEC
8 files WE-PD SMT Power Inductor 4.7 2.32 4.2 42 45 SMT 60 7332 Standard
744774047SPEC
8 files WE-PD2 SMT Power Inductor 4.7 3 5.5 56 33 SMT 71 5848
744042005SPEC
8 files WE-TPC SMT Tiny Power Inductor 5.6 1.64 1.35 80 55 SMT 90 4818 SMT
744042006SPEC
8 files WE-TPC SMT Tiny Power Inductor 6.8 1.5 1.25 80 60 SMT 100 4818 SMT
744774068SPEC
8 files WE-PD2 SMT Power Inductor 6.8 2.4 5 71 28 SMT 82 5848
744042008SPEC
8 files WE-TPC SMT Tiny Power Inductor 8.2 1.4 1.1 100 40 SMT 135 4818 SMT
744043008SPEC
8 files WE-TPC SMT Tiny Power Inductor 8.2 1.3 1.25 80 35 SMT 90 4828
744042100SPEC
8 files WE-TPC SMT Tiny Power Inductor 10 1.3 1 120 45 SMT 150 4818 SMT
744043100SPEC
8 files WE-TPC SMT Tiny Power Inductor 10 1.19 1 95 40 SMT 110 4828
74477810SPEC
8 files WE-PD SMT Power Inductor 10 1.83 2.2 68 32 SMT 72 7332 Standard
74477410SPEC
8 files WE-PD2 SMT Power Inductor 10 2.2 2.5 78 26 SMT 100 5848
744774112SPEC
8 files WE-PD2 SMT Power Inductor 12 2 1.94 82 24 SMT 110 5848
744778115SPEC
8 files WE-PD SMT Power Inductor 15 1.51 1.75 100 26 SMT 130 7332 Standard
744774115SPEC
8 files WE-PD2 SMT Power Inductor 15 1.53 1.9 89 23 SMT 140 5848
744774118SPEC
8 files WE-PD2 SMT Power Inductor 18 1.45 1.69 104 21 SMT 150 5848
744774122SPEC
8 files WE-PD2 SMT Power Inductor 22 1.28 1.53 109 16 SMT 180 5848
Samples
Order Code Data­sheet Simu­lation Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC
(mΩ)
fres
(MHz)
MountRDC max.
(mΩ)
SizeVersion Samples