LT1680CN - 60V Boost DC/DC Controller, 16-PDIP | Analog Devices
Teilenummer: LT1680CN ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $9.95 | $9,95 |
| 10 | $8.96 | $89,60 |
| 100 | $7.46 | $746,00 |
| 500 | $6.72 | $3.360,00 |
| 1.000 | $6.21 | $6.210,00 |
LT1680CN Übersicht
A switching controller IC (often called a PWM controller or DC-DC controller) is the brain of an external-MOSFET switched-mode power supply. Unlike a fully integrated switching regulator that contains the power switch on-die, a controller relies on an external MOSFET (or GaN/IGBT) to handle the actual current. This split lets the designer pick the switch technology for a target current/voltage, while the controller IC provides the regulation loop, gate drive, current sensing, and protection. The LT1680 sits in the linear regulator / voltage regulator / power management IC hierarchy under Analog Devices' Power Management portfolio.
The LT1680CN's headline features are: 60V input operation, fixed-frequency current-mode control, 10,000 pF gate-drive capability, programmable average current limiting, and a 5V reference output capable of sourcing 10 mA externally. Current-sense common-mode range extends to 60V, so the part can directly sense current in a high-side N-MOSFET boost converter without level-shifting tricks. These specs make it one of the few controller ICs in this package class that can drive high-voltage, high-current boost stages directly.
Architecturally, the LT1680 uses a current-mode PWM core with a high-side or low-side current sense, a 5V internal reference, an internal oscillator, and a high-current gate driver. The current-mode control provides inherent cycle-by-cycle current limiting and simplifies feedback compensation by treating the inductor as a current source. The high-voltage input tolerance is achieved with a robust high-V process and on-chip ESD structures rated for the full 60V input.
Typical applications include automotive 12V-to-24V/48V boost converters, telecom -48V distribution, industrial 24V step-up supplies, and high-power battery charging. The wide 4V-60V input range makes it compatible with nominal 12V, 24V, 36V, and 48V buses after transient headroom. The 5V/10mA reference can bias housekeeping circuits in the same converter.
When designing with this part, keep the gate-drive loop short: the LT1680 can charge 10,000 pF quickly, and any trace inductance between the GATE pin and the MOSFET gate will ring. Use a local gate resistor (10-47 ohm) to damp the loop, and place input ceramic bypass as close to the VIN pin as possible. Estimated: at 200 kHz with 10 nF effective gate capacitance, gate-drive losses alone can reach ~20 mW per MOSFET, so thermal management of the MOSFET (not the controller) is usually the design-limiting factor.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical PCB/thermal design notes not collated in the manufacturer datasheet alone.
Drop-in-Alternativen für LT1680CN – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
LT1680CN#PBF
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
LT1680IN#PBF
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
LT1680CSW#PBF
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
LT1680CN Grenzwerte & elektrische Eigenschaften
| Topologie | Boost, Forward Converter (Step-Up / Step-Up Step-Down) |
| PWM Type | Current Mode |
| Anzahl der Ausgänge | 1 |
| Ausgangstyp | Positive (Step-Up) |
| Input Voltage Range (VCC/VIN) | 4 V to 60 V |
| Maximum Switching Frequency | 200 kHz |
| Maximum Duty Cycle | 90% |
| Gate Drive Capability | Up to 10,000 pF MOSFET gate capacitance |
| Internal Reference Output | 5 V, 10 mA external load capability |
| Current Sense Common-Mode Range | Up to 60 V |
| Current Limiting | Programmable average current limiting |
| Supply Current (typ.) | 65 mA |
| Betriebstemperaturbereich | -40C to +85C (C grade) |
| Gehäuse | 16-PDIP (0.300 inch, 7.62 mm) |
| Montageart | Through-Hole |
| RoHS-Status | Depends on suffix: LT1680CN non-RoHS; LT1680CN#PBF RoHS compliant |
LT1680CN Pin-Konfiguration
| Pin 1 | VIN — Input supply voltage (4V to 60V) |
| Pin 2 | GND — Ground |
| Pin 3 | SENSE — Current sense input (common-mode up to 60V) |
| Pin 4 | VREF — 5V reference output (10 mA external load) |
| Pin 5 | FB — Feedback input (error amplifier inverting input) |
| Pin 6 | COMP — Error amplifier output / compensation node |
| Pin 7 | RT/CT — Oscillator timing resistor/capacitor (sets switching frequency up to 200 kHz) |
| Pin 8 | SS — Soft-start (controls startup ramp) |
| Pin 9 | NC — Not connected (per datasheet) |
| Pin 10 | NC — Not connected (per datasheet) |
| Pin 11 | GATE — Gate drive output for external N-channel MOSFET (up to 10,000 pF) |
| Pin 12 | VCC — Internal supply rail for gate driver |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | PGND — Power ground (gate driver return) |
| Pin 16 | VIN — Input supply voltage (tied to pin 1 internally; second VIN pin for high-current bypassing) |
Typische Anwendungen
LT1680CN ist geeignet für 6 Anwendungs: Automotive 12V to 24V/48V Boost Converter, Telecom -48V Distribution and Bias Supply, Industrial 24V to Higher-Voltage Step-Up Supply, High-Power Battery Charging (Lead-Acid / Li-ion), Display and LCD Backlight LED Driver (Boost Stage), Solar Panel and Energy-Harvesting Step-Up Converter.
Automotive 12V to 24V/48V Boost Converter
The LT1680CN is well-suited to automotive 12V-to-24V/48V boost converters where cold-crank and load-dump transients require a controller rated for 60V input. With 4-60V VIN tolerance and 60V current-sense common-mode range, the part directly handles an automotive bus after transient suppression, eliminating the need for upstream preregulation. The 10,000 pF gate-drive capability lets the designer pick a large N-channel MOSFET (e.g., 100 V/100 A class) for high-power stages without an external gate-driver buffer. At 200 kHz switching frequency, the inductor and output capacitor shrink to compact values, making it practical for under-hood ECU supplies. Companion products: LT3580 (lower-voltage alternative), LTC3780 (current-mode boost controller reference).
Empfohlen
Telecom -48V Distribution and Bias Supply
The LT1680CN's 60V input range covers telecom -48V distribution rails when used in a boost topology from a lower-voltage source, or as part of a step-up section in a multi-rail system. The fixed-frequency current-mode operation provides predictable EMI that can be filtered to meet telecom conducted/radiated emissions standards. The 5V/10 mA internal reference can bias local housekeeping circuitry (op-amps, logic) without an auxiliary LDO. The 16-PDIP package suits through-hole industrial designs common in telecom line cards. Companion products: LM5180NGUR (wide-Vin flyback), L9779WD-TR (automotive-style power management companion).
Empfohlen
Industrial 24V to Higher-Voltage Step-Up Supply
The LT1680CN excels in industrial 24V-bus boost converters that step the nominal 24V up to 36V, 48V, or higher for motor drives, sensors, or actuator supplies. The 4-60V VIN window includes the 24V nominal with full +/-20% tolerance and transient headroom. Current-mode control simplifies loop compensation and provides inherent cycle-by-cycle current limiting, which is critical for industrial environments where output short circuits must be contained. The 16-PDIP package is mechanically rugged for factory-floor equipment and field-wired enclosures. Companion products: LM34936QPWPRQ1 (wide-Vin synchronous boost), LM5085QMYE/NOPB (alternative non-sync boost).
Empfohlen
High-Power Battery Charging (Lead-Acid / Li-ion)
The LT1680CN's high-current gate driver and wide VIN tolerance make it a fit for high-power battery chargers that step up a 12V or 24V source to a higher charging voltage. Programmable average current limiting via the SENSE pin allows precise charge-current regulation, while the 5V reference can bias monitoring circuitry (coulomb counters, temperature sensors). The 90% max duty cycle supports high step-up ratios without saturating the converter. The current-mode control inherently shares current between paralleled converters when scaling to multi-kW stacks. Companion products: LM5085QMYE/NOPB (alternative boost controller), LM26480QSQ-AA/NOPB (companion PMIC for system power).
Empfohlen
Display and LCD Backlight LED Driver (Boost Stage)
The LT1680CN can form the boost stage in a multi-string LED backlight driver for LCD panels in industrial displays and automotive infotainment. The 60V input covers 24V and 48V display power rails, and the 200 kHz switching frequency is well above the AM band, simplifying EMI filtering. The high-current gate driver enables very low-RDS(on) MOSFETs for high-efficiency boost stages where every percentage point matters for thermal design. The 5V/10mA reference can bias the LED current-sense op-amps directly. Companion products: LP5024RSMR (LED driver companion), LM3405AXMKE/NOPB (companion LED driver reference).
Empfohlen
Solar Panel and Energy-Harvesting Step-Up Converter
The LT1680CN fits solar panel and energy-harvesting applications where a low-voltage panel (6V-24V) must be stepped up to a usable bus voltage (e.g., 24V or 48V). The wide 4-60V input range accommodates panels across varying irradiance levels, and the 90% duty cycle supports large step-up ratios. The high gate-drive capability allows large MOSFETs for low-loss conversion at high currents, maximizing harvested energy. The 60V current-sense common-mode range simplifies high-side current sensing without level shifters. Companion products: LM5085QMYE/NOPB (alternative boost controller for energy harvesting), LM25010SD/NOPB (companion wide-Vin buck).
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für LT1680CN – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | LT1680CN#PBF | LT1680IN#PBF |
|---|---|---|---|
| Package | 16-PDIP (0.300 inch, 7.62 mm) | 16-PDIP - same | 16-PDIP - same |
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Input Voltage Range | 4V to 60V | 4V to 60V | 4V to 60V |
| Maximum Switching Frequency | 200 kHz | 200 kHz | 200 kHz |
| Gate Drive Capability | 10,000 pF | 10,000 pF | 10,000 pF |
| Internal 5V Reference | 10 mA | 10 mA | 10 mA |
| Temperature Grade | Commercial (0C to +70C) | Commercial (0C to +70C) | Industrial (-40C to +85C) |
| RoHS Compliance | No (Sn/Pb or non-compliant matte tin) | Yes (Pb-free) | Yes (Pb-free) |
| Topology | Boost / Forward Converter | Boost / Forward Converter | Boost / Forward Converter |
Wichtigste Unterscheidungsmerkmale
- 60V input rating with 60V current-sense common-mode range (vs. LT1680CN#PBF)
- Commercial temperature grade (0C to +70C) (vs. LT1680IN#PBF)
- Original lead-finish (non-#PBF) variant (vs. LT1680CN#PBF)
Designhinweise
Keep the gate-drive loop short: place the LT1680CN GATE pin (pin 11), the external N-channel MOSFET gate, and the PGND return in a tight, low-inductance loop. Any trace inductance between the GATE pin and the MOSFET gate will ring when the driver charges the up-to-10,000 pF gate capacitance. A small series gate resistor of 10-47 ohm placed close to the MOSFET gate damps the loop and reduces EMI. Estimated: at 200 kHz with 10 nF effective gate capacitance, gate-drive losses are ~20 mW per MOSFET per switch cycle - so switch-node layout, not controller thermal, is the main EMI driver.
Use a local 1-10 uF ceramic bypass capacitor as close to the VIN pin (pin 1 and pin 16, both tied internally) as possible to handle the high di/dt of the gate-charge currents. For high-current designs, add a small electrolytic or polymer bulk capacitor near the controller. The 5V reference output (VREF, pin 4) is rated for 10 mA external load - sufficient to bias housekeeping op-amps and logic, but do not exceed 10 mA or the reference will droop and the oscillator frequency will shift. Add 100 nF ceramic decoupling on VREF.
Do not exceed the absolute maximum VIN of 60V; load-dump transients on automotive 12V buses can spike well above the nominal, so use a TVS clamp or input pi-filter. The current-sense common-mode range is up to 60V - it is not 100V tolerant, so for high-side sensing in boost topologies the SENSE pin must be referenced correctly. Do not leave the SS (soft-start, pin 8) pin floating; either tie a capacitor to ground or use the internal soft-start. Avoid placing the RT/CT capacitor near noisy switching traces - stray coupling into the timing node causes frequency jitter.
Compliance-Informationen
LT1680CN base part is non-RoHS (leaded finish). For RoHS-compliant ordering code, request LT1680CN#PBF (Pb-free). AEC-Q100 not qualified - automotive applications should review the LT1680 datasheet for qualification status.
