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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 UVLO
- Adaptive or Resistor Adjustable Dead Times
- Split-Output Gate Drivers for Adjustable Turn-On and Turn-Off Driver Strengths
- 100% Duty Cycle Operation
- Low Operating IQ: 5μA (48V<IN to 3.3VOUT)
- Spread Spectrum Frequency Modulation
- Programmable Frequency (100kHz to 2.5MHz);
- Synchronizable Frequency (100kHz to 2.5MHz);
- 28-Pin (4mm x 5mm) QFN Package
Typical applications
- Industrial Power Systems
- Telecommunications Power Systems
- Military/Avionics
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) | H(mm) | Fl(mm) | Packaging | 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 | Type | Mount | IR(A) | Working Voltage(V (AC)) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WCAP-CSGP MLCCs 50 V(DC), 6.8 nF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance6.8 nF | Capacitance±10% | Rated Voltage50 V (DC) | Size0603 | Operating Temperature -55 °C up to +125 °C | Dissipation Factor2.5 % | Insulation Resistance10 GΩ | Ceramic TypeX7R Class II | Length1.6 mm | Width0.8 mm | Height0.8 mm | Pad Dimension0.4 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |||||
 | WCAP-AT1H Aluminum Electrolytic Capacitors, 47 µF, ±20% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-AT1H Aluminum Electrolytic Capacitors | Capacitance47 µF | Capacitance±20% | Rated Voltage200 V (DC) | Size13.0 x 20.0 | – | Dissipation Factor15 % | – | – | Length20 mm | – | – | – | PackagingAmmopack | – | – | – | – | – | – | – | Endurance 10000 | Ripple Current980 mA | Leakage Current476 µA | Pitch5 mm | Diameter13 mm | – | – | – | – | – | ||||
 | WE-HCF SMT High Current Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCF SMT High Current Inductor | – | – | – | Size2013 | Operating Temperature -40 °C up to +125 °C | – | – | – | Length20.8 mm | Width20.5 mm | Height13.5 mm | – | – | Inductance5.5 µH | Performance Rated Current23.35 A | Saturation Current @ 10%30 A | Saturation Current @ 30%33 A | DC Resistance4.4 mΩ | Self Resonant Frequency21 MHz | Wire TypeFlat | – | – | – | – | – | Pins2 | – | MountSMT | Rated Current22 A | – | ||||
 | WR-PHD Pin Header, –, – | Simulation– | Downloads7 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | Operating Temperature -40 °C up to +105 °C | – | Insulation Resistance1000 MΩ | – | Length6 mm | – | – | – | PackagingBag | – | – | – | – | – | – | – | – | – | – | Pitch2 mm | – | Pins6 | TypeStraight | MountTHT | Rated Current2 A | Working Voltage200 V (AC) |