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IC-Hersteller ADI Power by Linear

IC-Hersteller (84)

ADI Power by Linear LT3514

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

Details

TopologieAbwärtswandler
Eingangsspannung3.2-36 V
Schaltfrequenz220-2400 kHz
Ausgang 11 A
Ausgang 21 A
Ausgang 32 A
IC-RevisionA

Beschreibung

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.

Eigenschaften

  • 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.

Typische Anwendungen

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

Weiterführende Informationen

Artikeldaten

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