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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) | Operating Temperature | 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 | -25 °C up to +105 °C | 980 | 476 | 5 | 13 | – | – | – | – | – | – | Ammopack | ||
 | 7443630550 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | 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 | – | -40 °C up to +125 °C | – | – | – | – | 2 | – | 13.5 | – | – | 22 | – | ||
 | 62000621121 | SPEC | – | 6 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 PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | |
| 62000621121 | SPEC | – |
| Samples |
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| 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) | Operating Temperature | IRIPPLE (mA) | ILeak (µA) | Pitch (mm) | Ø D (mm) | Pins (pcs) | Rows | H (mm) | Gender | Type | IR (A) | Packaging | Samples |
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