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Analog Devices LTC7897
140V, Low IQ, Synchronous Buck Controller with Programmable 5V to 10V Gate Drive
Overview
| Topology | Buck Converter |
| Input voltage | 4-135 V |
| Switching frequency | 100-2500 kHz |
| Output 1 | 135 V / 20 A |
Description
The LTC®7897 is a high performance, 100% duty cycle capable, synchronous step-down, DC/DC switching regulator controller that drives all N-channel synchronous silicon metal oxide field effect transistor (MOSFET) power stages. Synchronous rectification increases efficiency, reduces power loss, and simplifies the application design by reducing thermal requirements.
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
- Military/Avionics
- Telecommunications Power Systems
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 | C | VR(V (DC)) | Endurance(h) | IRIPPLE(mA) | ILeak(µA) | DF(%) | Pitch(mm) | Ø D(mm) | L(mm) | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCF SMT High Current Inductor, 4.7 µH, 34.95 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCF SMT High Current Inductor | Inductance4.7 µH | Performance Rated Current34.95 A | Saturation Current @ 10%70 A | Saturation Current @ 30%78 A | DC Resistance2.64 mΩ | Self Resonant Frequency20 MHz | Wire TypeFlat | – | – | – | – | – | – | – | – | Length27 mm | – | ||||
| WE-HCF SMT High Current Inductor, 5.5 µH, 23.35 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCF SMT High Current Inductor | 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 | – | – | – | – | – | – | – | – | Length20.8 mm | – | ||||
| WE-HCF SMT High Current Inductor, 7 µH, 19.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCF SMT High Current Inductor | Inductance7 µH | Performance Rated Current19.5 A | Saturation Current @ 10%27 A | Saturation Current @ 30%30 A | DC Resistance6.17 mΩ | Self Resonant Frequency18 MHz | Wire TypeFlat | – | – | – | – | – | – | – | – | Length20.8 mm | – | ||||
| WE-HCF SMT High Current Inductor, 10 µH, 34.95 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCF SMT High Current Inductor | Inductance10 µH | Performance Rated Current34.95 A | Saturation Current @ 10%32.6 A | Saturation Current @ 30%37 A | DC Resistance2.64 mΩ | Self Resonant Frequency13 MHz | Wire TypeFlat | – | – | – | – | – | – | – | – | Length27 mm | – | ||||
| WE-HCF SMT High Current Inductor, 15 µH, 15.4 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCF SMT High Current Inductor | Inductance15 µH | Performance Rated Current15.4 A | Saturation Current @ 10%19 A | Saturation Current @ 30%21 A | DC Resistance9.57 mΩ | Self Resonant Frequency12.8 MHz | Wire TypeFlat | – | – | – | – | – | – | – | – | Length20.8 mm | – | ||||
| WE-HCF SMT High Current Inductor, 22 µH, 34.95 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCF SMT High Current Inductor | Inductance22 µH | Performance Rated Current34.95 A | Saturation Current @ 10%15.5 A | Saturation Current @ 30%18 A | DC Resistance2.64 mΩ | Self Resonant Frequency9 MHz | Wire TypeFlat | – | – | – | – | – | – | – | – | Length27 mm | – | ||||
 | WCAP-AT1H Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-AT1H Aluminum Electrolytic Capacitors | – | – | – | – | – | – | – | Capacitance47 µF | Rated Voltage200 V (DC) | Endurance 10000 | Ripple Current980 mA | Leakage Current476 µA | Dissipation Factor15 % | Pitch5 mm | Diameter13 mm | Length20 mm | PackagingAmmopack |