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Analog Devices LTC7897 | Demoboard EVAL-LTC7897-AZ
Wide Input and Output Voltage Synchronous Buck Controller
Overview
| Topology | Buck Converter |
| Input voltage | 16-100 V |
| Switching frequency | 200-240 kHz |
| Output 1 | 12 V / 20 A |
Description
The evaluation circuit EVAL-LTC7897-AZ features the LTC®7897: a 140V Low IQ Synchronous Buck 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 smart 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, and a small 28-lead (4mm x 5mm) QFN package. These features allow for a wide variety of applications including industrial, military, medical, and telecommunications systems.The EVAL-LTC7897-AZ operates from a 16V to 100V input voltage range and generates a 12V, 20A output (see Figure 8 in user guide). The LTC7897 has a precision voltage reference providing an output voltage with 2% tolerance over the full operating conditions. The EVAL-LTC7897-AZ is set to a 200kHz switching frequency, which results in a small and efficient circuit. The converter achieves over 93% efficiency with a 20A load at full operating VIN and peak efficiency over 96%.
Features
Wide VIN Range: 4V to 135V (140V ABS MAX)Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 135V (140V ABS MAX)Adjustable Gate Drive Level: 5V to 10V (OPTI-DRIVE, 15V ABS MAX)Adjustable Driver Voltage UVLOAdaptive or Resistor Adjustable Dead TimesSplit-Output Gate Drivers for Adjustable Turn-On and Turn-Off Driver Strengths100% Duty Cycle OperationLow Operating IQ: 5μA (48V<IN to 3.3VOUT)Spread Spectrum Frequency ModulationProgrammable Frequency (100kHz to 2.5MHz);Synchronizable 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 | C | Tol. C | VR (V (DC)) | Size | Operating Temperature | DF (%) | RISO | Ceramic Type | L (mm) | W (mm) | Fl (mm) | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC max. (mΩ) | fres (MHz) | Wire Type | Endurance (h) | IRIPPLE (mA) | ILeak (µA) | Pitch (mm) | Ø D (mm) | Pins (pcs) | Rows | H (mm) | Gender | Type | IR (A) | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 885012206088 | SPEC | 9 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-CSGP MLCCs 50 V(DC) | 6.8 nF | ±10% | 50 | 0603 | -55 °C up to +125 °C | 2.5 | 10 GΩ | X7R Class II | 1.6 | 0.8 | 0.4 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 0.8 | – | – | – | 7" Tape & Reel | ||
 | 860241078002 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-AT1H Aluminum Electrolytic Capacitors | 47 µF | ±20% | 200 | 13.0 x 20.0 | – | 15 | – | – | 20 | – | – | – | – | – | – | – | – | – | 10000 | 980 | 476 | 5 | 13 | – | – | – | – | – | – | Ammopack | ||
 | 7443630550 | SPEC | 9 files | Active i| Production is active. Expected lifetime: >10 years. | WE-HCF SMT High Current Inductor | – | – | – | 2013 | -40 °C up to +125 °C | – | – | – | 20.8 | 20.5 | – | 5.5 | 23.35 | 30 | 33 | 4.4 | 21 | Flat | – | – | – | – | – | 2 | – | 13.5 | – | – | 22 | – | ||
 | 62000621121 | SPEC | – | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm THT Dual Pin Header | – | – | – | – | -40 °C up to +105 °C | – | 1000 MΩ | – | 6 | – | – | – | – | – | – | – | – | – | – | – | – | 2 | – | 6 | Dual | – | Pin Header | Straight | 2 | Bag |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 885012206088 | SPEC | |
| 860241078002 | SPEC | |
| 7443630550 | SPEC | |
| 62000621121 | SPEC | – |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Tol. C | VR (V (DC)) | Size | Operating Temperature | DF (%) | RISO | Ceramic Type | L (mm) | W (mm) | Fl (mm) | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC max. (mΩ) | fres (MHz) | Wire Type | Endurance (h) | IRIPPLE (mA) | ILeak (µA) | Pitch (mm) | Ø D (mm) | Pins (pcs) | Rows | H (mm) | Gender | Type | IR (A) | Packaging | Samples |
|---|
