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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 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 | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC max. (mΩ) | fres (MHz) | Wire Type | C | VR (V (DC)) | Endurance (h) | Operating Temperature | IRIPPLE (mA) | ILeak (µA) | DF (%) | Pitch (mm) | Ø D (mm) | L (mm) | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 7443640470 | SPEC | 9 files | Active i| Production is active. Expected lifetime: >10 years. | WE-HCF SMT High Current Inductor | 4.7 | 34.95 | 70 | 78 | 2.64 | 20 | Flat | – | – | – | -40 °C up to +125 °C | – | – | – | – | – | 27 | – | ||
| 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 | 5.5 | 23.35 | 30 | 33 | 4.4 | 21 | Flat | – | – | – | -40 °C up to +125 °C | – | – | – | – | – | 20.8 | – | ||
| 7443630700 | 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 | 7 | 19.5 | 27 | 30 | 6.17 | 18 | Flat | – | – | – | -40 °C up to +125 °C | – | – | – | – | – | 20.8 | – | ||
| 7443641000 | SPEC | 9 files | Active i| Production is active. Expected lifetime: >10 years. | WE-HCF SMT High Current Inductor | 10 | 34.95 | 32.6 | 37 | 2.64 | 13 | Flat | – | – | – | -40 °C up to +125 °C | – | – | – | – | – | 27 | – | ||
| 7443631500 | 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 | 15 | 15.4 | 19 | 21 | 9.57 | 12.8 | Flat | – | – | – | -40 °C up to +125 °C | – | – | – | – | – | 20.8 | – | ||
| 7443642200 | SPEC | 9 files | Active i| Production is active. Expected lifetime: >10 years. | WE-HCF SMT High Current Inductor | 22 | 34.95 | 15.5 | 18 | 2.64 | 9 | Flat | – | – | – | -40 °C up to +125 °C | – | – | – | – | – | 27 | – | ||
 | 860241078002 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-AT1H Aluminum Electrolytic Capacitors | – | – | – | – | – | – | – | 47 µF | 200 | 10000 | -25 °C up to +105 °C | 980 | 476 | 15 | 5 | 13 | 20 | Ammopack |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 7443640470 | 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. | |
| 7443630700 | 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. | |
| 7443641000 | SPEC | |
| 7443631500 | 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. | |
| 7443642200 | SPEC | |
| 860241078002 | SPEC |
| Samples |
|---|
| 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) | Operating Temperature | IRIPPLE (mA) | ILeak (µA) | DF (%) | Pitch (mm) | Ø D (mm) | L (mm) | Packaging | Samples |
|---|
