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Analog Devices Inc. LT1680CSW#PBF
- Part No.:
- LT1680CSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LT1680CSW#PBF.pdf
- Description:
- IC REG CTLR BST/FWRD CONV 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:529
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Product details
Overview
LT1680CSW#PBF from Analog Devices (formerly Linear Technology) is a high-power, current-mode DC/DC step-up controller optimized for boost topologies, driving N-channel MOSFETs with gate capacitance up to 10,000 pF, operating from 12 V input up to 60 V, and supporting fixed-frequency operation up to 200 kHz. It delivers programmable average current limiting (120 mV threshold), 5 V reference output (±2.5% tolerance, 10 mA load), and undervoltage lockout with 350 mV hysteresis - enabling robust 48 V/5.2 A industrial boost converters.
For engineers reviewing the LT1680CSW#PBF datasheet, LT1680CSW#PBF pinout, LT1680CSW#PBF application, or LT1680CSW#PBF equivalent, key selection considerations include its 16-lead SOIC-Wide package, 120 mV average current limit threshold referenced to RSENSE, 1.25 V error amplifier reference, soft-start charge current of 8 µA, and synchronization capability up to 200 kHz - all critical for high-reliability power supply sequencing and lead-acid battery backup systems.
Technical Context
The LT1680CSW#PBF implements constant-frequency current-mode control with internal oscillator timing (CT pin), programmable via RCT/CCT network, and supports external synchronization via TTL-compatible SYNC pin. Its transconductance error amplifier (gm = 1200–3200 µ℧) drives the VC pin to modulate peak current comparator threshold, while independent average current limiting operates via IAVG pin integrator (50 kΩ output impedance) without ripple coupling.
It features dual-sense architecture: SENSE+ and SENSE− accept common-mode voltages up to 60 V, eliminating sense blanking; RUN/SHDN provides precision 1.25 V enable threshold with 25 mV hysteresis for supply sequencing; and SL/ADJ enables user-adjustable slope compensation to stabilize duty cycles up to 90%, decoupling stability from inductor ripple amplitude.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | Programmable up to 200 kHz; enables compact magnetics and EMI control in high-power boost designs. |
| Average Current Limit Threshold | 120 mV at sense inputs; sets precise DC input current limit independent of ripple, critical for battery protection. |
| 5 V Reference Output | 4.75–5.25 V, ±2.5% tolerance, 10 mA DC load; powers external timing components and bias circuits reliably. |
| Error Amplifier Reference Voltage | 1.242–1.258 V at VFB; defines output voltage accuracy via feedback divider (VOUT = 1.25 × (1 + R2/R1)). |
| Input Common-Mode Sense Range | –0.3 V to 60 V on SENSE+/SENSE−; allows high-side current sensing directly referenced to VIN, no level-shifting needed. |
| Undervoltage Lockout Threshold | Falling edge: 8.20–9.75 V; rising edge: 9.35–9.95 V; 200–350 mV hysteresis prevents chatter during brownout recovery. |
| Soft Start Charge Current | 5–14 µA into external capacitor; determines controlled ramp time for output voltage and current during startup. |
Pinout & Package
LT1680CSW#PBF is housed in a 16-lead plastic SOIC-Wide (SW) package with θJA = 90°C/W, rated for 0°C to 70°C ambient operation (C-grade). Pin 1 is SL/ADJ; pin 16 is 5VREF. All pins are electrically defined per Linear Technology's official LT1680 datasheet Rev. C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SL/ADJ (1) | Slope compensation adjustment | Resistive loading tailors additional ramp for >50% duty cycle stability; floating or tied to 5VREF disables extra compensation. |
| CT (2) | Oscillator timing node | Connects to RCT (pull-up to 5VREF) and CCT (to SGND); sets free-run frequency and minimum off-time (~1 µs). |
| IAVG (3) | Average current limit integrator output | 50 kΩ impedance node; external capacitor to VC forms active integrator for ripple-free DC current limiting. |
| SS (4) | Soft start timing input | Sources ~8 µA to external capacitor; clamped during UVLO/shutdown to ensure graceful restart. |
| VC (5) | Error amplifier output | Drives current comparator threshold; RC compensation here shapes loop stability and transient response. |
| SGND (6) | Small-signal ground reference | Return for feedback, reference, and error amplifier circuits; must be star-connected to minimize noise coupling. |
| VFB (7) | Error amplifier inverting input | Accepts 0.5 µA bias current; connects to resistor divider from VOUT to set regulated output voltage. |
| VREF (8) | Bandgap reference decoupling | Internal 1.25 V reference; requires ≥0.1 µF bypass to SGND for noise immunity and loop stability. |
| SENSE+ (9) | Current sense amplifier inverting input | Connected to high-side of RSENSE; accepts common-mode up to 60 V, enabling direct VIN-referenced sensing. |
| SENSE− (10) | Current sense amplifier noninverting input | Connected to low-side of RSENSE; differential input rejects common-mode noise in high-current paths. |
| RUN/SHDN (11) | Precision enable/disable input | 1.25 V threshold with 25 mV hysteresis; used for power sequencing, UV detection, or logic-level shutdown. |
| PGND (12) | Power ground return | Low-impedance return for GATE driver and switch node; must tie directly to VIN capacitor negative terminal. |
| GATE (13) | N-channel MOSFET gate driver output | 11–12 V swing, 60–200 ns rise/fall; drives up to 10,000 pF, supporting high-current discrete FETs like IRFZ44. |
| 12VIN (14) | Main supply input | –0.3 V to 20 V range; powers internal circuitry; requires ≥1 µF ceramic bypass to PGND. |
| SYNC (15) | Oscillator synchronization input | TTL-compatible; triggers one-shot to lower CT high-threshold to 2 V for sync pulse alignment; min. 1 µs high/low times. |
| 5VREF (16) | 5 V reference output | Stable 5 V supply for external timing resistors/capacitors; disabled during shutdown; needs ≥1 µF bypass to SGND. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable average current limiting | 120 mV threshold referenced to RSENSE, independent of switching ripple - ensures accurate DC input current control for battery and thermal management. |
| User-adjustable slope compensation | SL/ADJ pin allows external resistor divider from 5VREF to tailor ramp onset per cycle - stabilizes operation up to 90% duty cycle without reducing peak current capability. |
| High-voltage current sense inputs | SENSE+/SENSE− support –0.3 V to 60 V common-mode range - eliminates need for sense blanking or level-shifters in high-input-voltage boost applications. |
| Integrated 5 V reference with load drive | Delivers ±2.5% 5 V output capable of sourcing 10 mA DC - powers external RCT/CCT networks and auxiliary logic without secondary LDO. |
| Minimum off-time protection | ~1 µs forced off-time prevents switch overlap and shoot-through - protects external MOSFETs during overload or short-circuit conditions. |
| Soft start gated by UVLO and shutdown | SS pin current disabled during undervoltage lockout or RUN/SHDN assertion - guarantees controlled recovery after fault or brownout events. |
Applications
| Industrial Power Supplies | Distributed Battery Backup Systems |
|---|---|
Use Scenario: 12 V to 48 V, 250 W boost converter powering PLC I/O modules in factory automation cabinets. IC Role / Device Role / Timing Role: Primary step-up controller managing N-channel MOSFET switching, current sensing, and output regulation via feedback divider. Use Value: Programmable average current limit (120 mV) prevents overcurrent stress on lead-acid batteries during cold cranking loads. |
Use Scenario: Telecom central office UPS maintaining 48 V backplane during AC mains failure using sealed lead-acid battery bank. IC Role / Device Role / Timing Role: High-efficiency boost controller with UVLO hysteresis (350 mV) and sequenced RUN/SHDN enable to coordinate battery switchover. Use Value: 60 V sense common-mode range enables direct high-side RSENSE placement, simplifying layout and improving measurement accuracy under surge conditions. |
| Automotive Auxiliary Power | Heavy Equipment Onboard Charging |
Use Scenario: 24 V vehicle electrical system boosting to 48 V for ADAS camera power, operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Current-mode controller with temperature-stable 1.25 V VFB reference and 200 kHz sync capability for EMI reduction in noisy engine bays. Use Value: SYNC pin allows alignment with master clock to avoid beat frequencies; SL/ADJ pin enables slope tuning for wide-duty-cycle operation during cold starts. |
Use Scenario: Off-highway diesel generator set charging 48 V traction battery from 28 V alternator output under variable load and vibration. IC Role / Device Role / Timing Role: Robust boost controller with 10,000 pF gate drive strength and PGND/SGND separation to withstand high dI/dt transients. Use Value: GATE output rise/fall times (60–200 ns) minimize switching losses in high-current IRFZ44-based designs, sustaining >92% efficiency at full 5.2 A load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EFE#PBF | Wide-input synchronous buck-boost controller (4–36 V), integrated gate drivers, no external N-FET required; lacks 60 V sense common-mode range. | Best for bidirectional or input-voltage-variable applications; not suitable for 60 V high-side sensing or discrete N-FET gate drive beyond 10 nC. | Select LTC3780EFE#PBF only when synchronous rectification and input voltage flexibility outweigh need for ultra-high VIN sensing and discrete FET scalability. |
| LM5122MMX/NOPB | Current-mode boost controller with 65 V max VIN, 1.5 A integrated gate driver, 50 µA quiescent current; no average current limit function or SL/ADJ pin. | Optimized for lower-power, low-quiescent designs; cannot replace LT1680CSW#PBF where precise DC input current limiting or >50% duty cycle stability is mandatory. | Choose LM5122MMX/NOPB for cost-sensitive, medium-power boost supplies where average current limiting is unnecessary and gate drive <10 nC suffices. |
Compared with LTC3780EFE#PBF and LM5122MMX/NOPB, the LT1680CSW#PBF uniquely combines 60 V sense common-mode capability, programmable average current limiting, and user-adjustable slope compensation - making it irreplaceable in high-reliability, high-power lead-acid battery backup and industrial boost converters requiring precise DC current control and >50% duty cycle stability.
Availability
LT1680CSW#PBF is available at Aetrix Electronics and suitable for industrial control systems, distributed battery backup systems, and automotive auxiliary power supplies requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1680CSW#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (including legacy Linear Technology products) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and medical markets with precision, reliability, and innovation.
The LT1680CSW#PBF belongs to Linear Technology's high-power DC/DC controller product line, designed specifically for ruggedized boost converter applications demanding wide input voltage range, high gate drive strength, and accurate average current limiting - especially in battery-backed and heavy equipment power systems.
FAQ
What is the maximum input voltage the LT1680CSW#PBF can handle?
The LT1680CSW#PBF supports a power supply input voltage (12VIN pin) up to 20 V absolute maximum, but its current sense amplifier accepts common-mode voltages from SENSE+ and SENSE− up to 60 V - enabling use in boost topologies where input voltage may be derived from higher-voltage sources via isolated sensing. The device itself is rated for operation with 12 V nominal input, and its internal circuits are optimized for this range.
Does the LT1680CSW#PBF support synchronization with an external clock?
Yes, the LT1680CSW#PBF supports external synchronization via the SYNC pin (Pin 15), which accepts TTL-level input signals. The internal oscillator can be synchronized up to 200 kHz, with minimum high- and low-time requirements of ≥1 µs each. This feature allows EMI reduction through clock alignment in multi-converter systems and is fully functional across the device's operating temperature range.
How does the average current limiting function work on the LT1680CSW#PBF?
The LT1680CSW#PBF implements average current limiting via the IAVG pin (Pin 3), which forms a single-pole integrator with an external capacitor (typically 220 pF to VC). With a 50 kΩ output impedance, it integrates the current sense amplifier output to generate a DC representation of input current. When this exceeds 120 mV across RSENSE, the VC pin is clamped - enforcing precise DC current limiting independent of ripple amplitude.
What is the purpose of the SL/ADJ pin on the LT1680CSW#PBF?
The SL/ADJ pin (Pin 1) on the LT1680CSW#PBF enables user-adjustable slope compensation to stabilize current-mode control at duty cycles above 50%. Resistive loading of this pin - for example, via a divider from 5VREF - increases effective ramp slope, preventing subharmonic oscillation. Leaving it open or tying it to 5VREF disables additional compensation, relying on the internal ramp sufficient for most applications.
Can the LT1680CSW#PBF drive multiple parallel MOSFETs?
Yes, the LT1680CSW#PBF is explicitly designed to drive high-gate-capacitance N-channel MOSFETs, with a specified capability of handling up to 10,000 pF total gate capacitance. In the documented 12V-to-48V, 250W reference design, three IRFZ44 devices are driven in parallel - confirming its suitability for multi-FET configurations in high-current boost converters.
LT1680CSW#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Forward Converter
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 9V ~ 60V
- Frequency - Switching:
- -
- Duty Cycle (Max):
- 90%
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LT1680CSW#PBF FAQ
1.How can I place an order for LT1680CSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1680CSW#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT1680CSW#PBF reliable?
The price and inventory of LT1680CSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1680CSW#PBF is usually 5 days.
3.What payment methods are accepted for LT1680CSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1680CSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1680CSW#PBF?
LT1680CSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1680CSW#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT1680CSW#PBF?
For technical support, including LT1680CSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1680CSW#PBF requirements.
6.How does Aetrix verify that LT1680CSW#PBF is sourced from the original manufacturer or authorized distributors?
All LT1680CSW#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT1680CSW#PBF meets industry standards.
7.What is the process for return or replacement of LT1680CSW#PBF?
All LT1680CSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1680CSW#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT1680CSW#PBF part is unused and in its original packaging.
Return procedure for LT1680CSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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