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Analog Devices LTC7899 | Demoboard EVAL-LTC7899-AZ
High Voltage Synchronous Negative to Positive Converter
Overview
| Topology | Boost Converter |
| Input voltage | -54 - -32 V |
| Switching frequency | 150-180 kHz |
| Output 1 | 48 V / 8.8 A |
Description
The evaluation circuit EVAL-LTC7899-AZ features the LTC®7899: a 140V Low IQ, synchronous, negative input to positive output controller with programmable 5V to 10V gate drive. Split gate drivers allow for easily adjustable turn-on and turn-off of FETs. User adjustable adaptive and set dead time control modes are available for optimal gate timing. Additionally, the IC features low IQ, up to 2.5MHz programmable/synchronizable switching frequency, spread spectrum, in a small 28-lead (4mm x 5mm) QFN package. These features allow for a wide variety of applications including industrial, military, and telecommunications systems.The EVAL-LTC7899-AZ operates from a -32V to -54V input voltage range and generates a positive 48V output, up to 8.8A load current. The EVAL-LTC7899-AZ is set to a 150kHz switching frequency, which results in up to 97.3% peak efficiency.The LTC7899 supports a wide input and output voltage range (|VIN- |+VOUT) up to 135V. The evaluation circuit has been designed with 120V FETs, various FETs of similar footprint can be substituted to fit a wide array of applications.The EVAL-LTC7899-AZ provides a high-performance, cost-effective solution for generating a positive 48V output from a negative input. The LTC7899 data sheet gives a complete description of this part, its operation, and application information. The data sheet must be read in conjunction with this user guide for EVAL-LTC7899-AZ. Design files for this circuit board are available at www.analog.com.
Features
Converts Negative Input to Positive Output Regulated with Respect to GroundWide |VIN |+VOUT Range: 4V to 135V (140V ABS MAX)Internal Feedback Level Shifter for Easy Output Voltage Programming with Two ResistorsAdjustable Gate Drive Level: 5V to 10V (OPTI-DRIVE, 14V ABS MAX)Adjustable Driver Voltage UVLOAdaptive or Resistor-Adjustable Dead TimesSplit-Output Gate Drivers for Adjustable Turn-On and Turn-Off Driver StrengthsSupports Positive Input to Positive Output Boost Up to 135V with Pass-ThroughOperation Down to 1V after Start-UpCLK Output for High Power PolyPhase OperationSpread Spectrum Frequency ModulationProgrammable Frequency (100kHz to 2.5MHz)Phase-Lockable Frequency (100kHz to 2.5MHz)28-Pin (4mm x 5mm) QFN Package
Typical applications
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC max. (mΩ) | fres (MHz) | Wire Type | Pins (pcs) | Rows | H (mm) | Gender | Type | IR (A) | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 7443641500 | SPEC | 9 files | Active i| Production is active. Expected lifetime: >10 years. | WE-HCF SMT High Current Inductor | 15 | 34.95 | 22 | 26 | 2.64 | 11 | Flat | 2 | – | 18.5 | – | – | 35 | – | ||
 | 60800213421 | SPEC | – | 3 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm Jumper with Test Point | – | – | – | – | – | – | – | 2 | – | – | Jumper | – | 3 | Bag | |
 | 62000311121 | SPEC | – | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm THT Pin Header | – | – | – | – | – | – | – | 3 | Single | – | Pin Header | Straight | 2 | Bag | |
 | 62000621121 | SPEC | – | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm THT Dual Pin Header | – | – | – | – | – | – | – | 6 | Dual | – | Pin Header | Straight | 2 | Bag |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 7443641500 | SPEC | |
| 60800213421 | SPEC | – |
| 62000311121 | SPEC | – |
| 62000621121 | SPEC | – |
| Samples |
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| Order Code | Datasheet | Simulation | Downloads | Status | Product series | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC max. (mΩ) | fres (MHz) | Wire Type | Pins (pcs) | Rows | H (mm) | Gender | Type | IR (A) | Packaging | Samples |
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