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Analog Devices LT8337 | Demoboard EVAL-LT8337-AZ
28V, 5A Low IQ Synchronous Step-Up Silent Switcher with PassThru
Overview
| Topology | Boost Converter |
| Input voltage | 4.5-12 V |
| Switching frequency | 2000-2400 kHz |
| Output 1 | 12 V / 1.2 A |
Description
Evaluation circuit EVAL-LT8337-AZ features the LT®8337 as a 2MHz low IQ, synchronous boost converter with a 12V output from 4.5V to 12V input. When VIN goes above the 12V output regulation setpoint, the LT8337 smoothly transitions between regulation and PassThru™ mode. This evaluation circuit features Spread Spectrum Frequency Modulation (SSFM), Silent Switcher® technology, and EMI filters to provide optimum EMI performance. The converter can output 1.2A or more depending on input voltage (see Figure 3 for the Maximum Output Current vs VIN curve). When placed in shutdown, the converter has very low quiescent current, ideal in automotive and other battery-powered applications. PULSE SKIP and BURST modes are selectable with jumper JP1. Each user-selectable option enables low quiescent current at light load and can also be combined with SSFM operation using JP1. The LT8337 boost converter IC operates over an input range of 2.7V to 28V, suitable for automotive, telecom and industrial applications. It exhibits a low quiescent current of 4μA, making it ideal for battery-operated systems. The converter provides adjustable and synchronizable operation from 300kHz to 3MHz with SSFM option. At light load, either PULSE SKIP or low-ripple BURST mode can be selected to improve the efficiency. The LT8337 packs popular features such as soft-start, input undervoltage lockout, adjustable switching frequency and clock synchronization. The Power Good (PG) flag indicates when the output voltage is in regulation. The LT8337 comes in a small 16-lead plastic LQFN package for optimal size and emissions. The LT8337 data sheet gives a complete description of the part, pins, features, operation, and application information. The data sheet must be read in conjunction with this demo manual for EVAL-LT8337-AZ.
Features
- Silent Switcher® Architecture
- Ultralow EMI Emissions
- Optional Spread Spectrum Frequency Modulation
- Integrated 28V, 5A Power Switches
- Wide Input Voltage Range: 2.7V to 28V
- Output Voltage Programmable Up to 26V
- Low VIN Pin Quiescent Current
- 0.3μA in Shutdown
- 4μA in Burst Mode® Operation (LT8337)
- 15μA in PassThru™ (LT8337)
- 100% Duty Cycle Capability for Synchronous MOSFET
- External Compensation: Fast Transient Response (LT8337-1)
- Power Good Monitor (LT8337)
- Adjustable and Synchronizable: 300kHz to 3MHz
- Pulse-Skipping or Burst Mode Operation at Light Load
- Small 16-Lead (3mm × 3mm) LQFN Package
Typical applications
- Automotive, telecom and All registered trademarks and trademarks are the property of their respective owners. industrial applications.
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | ISAT1(A) | ISAT2(A) | fres(MHz) | IRP,40K(A) | ISAT,30%(A) | RDC typ.(mΩ) | VOP(V) | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR 2(mA) | RDC max.(mΩ) | Type | Pins | Mount | L(mm) | H(mm) | IR(A) | Working Voltage(V (AC)) | Operating Temperature | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-PMCI Power Molded Chip Inductor, 0.25 µH, 8.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PMCI Power Molded Chip Inductor | Inductance0.25 µH | Saturation Current 18.5 A | Saturation Current 215.65 A | Self Resonant Frequency150 MHz | Performance Rated Current9.05 A | Saturation Current @ 30%15.65 A | DC Resistance26 mΩ | – | – | – | – | Rated Current 24000 mA | DC Resistance31 mΩ | – | – | MountSMT | Length3.2 mm | Height1.5 mm | Rated Current9.05 A | – | Operating Temperature -40 °C up to +125 °C | ||||
 | WE-MAPI SMT Power Inductor, 1.5 µH, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MAPI SMT Power Inductor | Inductance1.5 µH | – | – | Self Resonant Frequency48 MHz | Performance Rated Current8.2 A | Saturation Current @ 30%11 A | DC Resistance17.1 mΩ | Operating Voltage80 V | – | – | – | – | DC Resistance20 mΩ | – | Pins2 | MountSMT | Length4.3 mm | Height3.1 mm | Rated Current6.2 A | – | Operating Temperature -40 °C up to +125 °C | ||||
 | WE-CBF SMT EMI Suppression Ferrite Bead, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | – | – | – | – | – | – | – | – | Impedance @ 100 MHz600 Ω | Maximum Impedance700 Ω | Maximum Impedance150 MHz | Rated Current 22000 mA | DC Resistance150 mΩ | TypeHigh Current | – | MountSMT | Length2 mm | Height0.0009 mm | Rated Current1.5 A | – | Operating Temperature -55 °C up to +125 °C | ||||
 | WR-PHD Pin Header, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | – | – | – | – | – | – | – | – | TypeStraight | Pins10 | MountTHT | Length10 mm | – | Rated Current2 A | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C | |||
 | WR-PHD Jumper, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Jumper | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Pins2 | – | – | – | Rated Current3 A | Working Voltage200 V (AC) | Operating Temperature -25 °C up to +105 °C |