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Overview
| Topology | SEPIC Buck-Boost Topology |
| Input voltage | 2.8-28 V |
| Switching frequency | 300-2000 kHz |
| Output 1 | 5 V / 3.3 A |
Description
The LT®8334 is a current mode DC/DC converter with a 40V, 5A switch operating from a 2.8V to 40V input. With a unique single feedback pin architecture, it is capable of boost, SEPIC or inverting configurations. Burst Mode operation consumes as low as 9μA quiescent current to maintain high efficiency at very low output currents, while keeping typical output ripple below 15mV.An external compensation pin allows optimization of loop bandwidth over a wide range of input and output volt-ages and programmable switching frequencies between 300kHz and 2MHz. A SYNC/MODE pin allows synchroni-zation to an external clock. It can also be used to select between BURST or PULSE SKIP modes of operation with spread spectrum frequency modulation for low EMI. For increased efficiency, a BIAS pin can accept a second input to supply the INTVCC regulator. Additional features include frequency foldback and programmable soft-start to con-trol inductor current during start-up.The LT8334 is available in a thermally enhanced 12-lead 4mm × 3mm DFN package
Features
- Wide Input Voltage Range: 2.8V to 40V
- Ultralow Quiescent Current and Low Ripple Burst
- Mode® Operation: IQ = 9μA
- 5A, 40V Power Switch
- Positive or Negative Output Voltage Programming with a Single Feedback Pin
- Programmable Frequency (300kHz to 2MHz)
- Sychronizable to an External Clock
- Spread Spectrum Frequency Modulation for Low EMI
- Bias Pin for Higher Efficiency
- Programmable Undervoltage Lockout (UVLO)
- Overcurrent and Overtemperature Protection
- Thermally Enhanced 12-Lead 4mm × 3mm DFN
Typical applications
- Industrial and Automotive
- Medical Diagnostic Equipment
- Telecom
- Portable Electronics
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR 2(mA) | RDC max.(Ω) | Type | L1(µH) | L2(µH) | IR(mA) | ISAT(A) | RDC1 typ(Ω) | RDC2 typ(Ω) | RDC1 max(Ω) | RDC2 max(Ω) | fres(MHz) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-CBF SMT EMI Suppression Ferrite Bead, 785 Ω, 1300 Ω | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | Impedance @ 100 MHz785 Ω | Maximum Impedance1300 Ω | Maximum Impedance60 MHz | Rated Current 23000 mA | DC Resistance0.05 Ω | TypeHigh Current | – | – | Rated Current2000 mA | – | – | – | – | – | – | ||||
 | WE-DD SMT Shielded Coupled Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-DD SMT Shielded Coupled Inductor | – | – | – | Rated Current 24400 mA | DC Resistance0.035 Ω | TypeStraight | Inductance 11.3 µH | Inductance 21.3 µH | Rated Current4400 mA | Saturation Current6.3 A | DC Resistance 10.027 Ω | DC Resistance 20.027 Ω | DC Resistance 10.035 Ω | DC Resistance 20.035 Ω | Self Resonant Frequency60 MHz |