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Analog Devices Inc. LT1680ISW#TRPBF
- Part No.:
- LT1680ISW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LT1680ISW#TRPBF.pdf
- Description:
- IC REG CTLR BST/FWRD CONV 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,205
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Product details
Overview
LT1680ISW#TRPBF from Analog Devices (formerly Linear Technology) is a high-power, current-mode DC/DC boost controller optimized for 12V–60V input applications driving N-channel MOSFETs. It delivers programmable average current limiting (120 mV threshold), fixed-frequency operation up to 200 kHz, and 5 V reference output with 10 mA load capability - enabling robust 48 V/5.2 A industrial boost converters.
For engineers reviewing the LT1680ISW#TRPBF datasheet, LT1680ISW#TRPBF pinout, LT1680ISW#TRPBF application, or LT1680ISW#TRPBF equivalent, key selection considerations include its 60 V sense common-mode range, gate drive capable of 10,000 pF loads, undervoltage lockout with 350 mV hysteresis, soft-start control via external capacitor, and slope compensation adjustability for >50% duty cycle stability.
Technical Context
The LT1680ISW#TRPBF implements a constant-frequency, current-mode control architecture with an internal transconductance error amplifier (2000 µmho typical), programmable oscillator (RCT/CCT-based), and dual current limit scheme: peak sensing (190 mV) and average sensing (120 mV at IAVG pin). Its VC pin serves as the error amplifier output and current comparator threshold node, while the IAVG pin hosts a 50 kΩ-output-impedance integrator for average current regulation.
It features precision analog functions including a bandgap-referenced 1.25 V feedback threshold (±13 mV over temperature), 5 V reference (±250 mV line/load/temperature), and RUN/SHDN shutdown with 1.25 V rising threshold and 25 mV hysteresis. The IC supports synchronization up to 200 kHz and includes minimum off-time protection (~1 µs) and slope compensation adjustment via SL/ADJ pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | –0.3 V to 20 V on 12VIN pin; sense common mode up to 60 V enables direct high-side current sensing without blanking circuits |
| Operating Frequency | Programmable up to 200 kHz; synchronized via TTL-compatible SYNC pin with ≥1 µs min pulse width |
| Average Current Limit | 120 mV threshold at SENSE pins; set independently of ripple via IAVG integrator - enables stable DC current limiting at up to 90% duty cycle |
| 5 V Reference Output | 4.75–5.25 V over temp; supplies up to 10 mA DC for timing resistors, bias networks, or local logic - not available in shutdown |
| Gate Drive Capability | 11.9 V high-side output with 60 ns rise/fall times; drives up to 10,000 pF gate capacitance - supports paralleled high-current MOSFETs |
| Undervoltage Lockout | Falling threshold 8.2–9.75 V; rising threshold 9.35–9.95 V; 200–350 mV hysteresis prevents oscillation during brownout recovery |
| Soft Start Control | 8 µA constant current into external SS capacitor; clamped during UVLO/shutdown for graceful restart after fault conditions |
Pinout & Package
LT1680ISW#TRPBF is housed in a 16-lead plastic SO wide (SW) package with exposed thermal pad (θJA = 90°C/W), rated for –40°C to +85°C operating ambient temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SL/ADJ (1) | Slope compensation adjustment | Resistive loading increases effective ramp slope; floating or tied to 5VREF disables extra compensation - critical for >50% duty cycle stability |
| CT (2) | Oscillator timing node | Connects to RCT (to 5VREF) and CCT (to SGND); sets frequency and minimum off-time - determines max duty cycle (e.g., RCT = 16.9k → ~100 kHz) |
| IAVG (3) | Average current limit integrator | 50 kΩ output impedance forms single-pole filter with external cap (e.g., 220 pF to VC); shorting to SGND disables average current limiting |
| SS (4) | Soft start timing input | Sources 8 µA to external capacitor; controls ramp rate of VC clamp voltage - sets startup time (tSS ≈ 1.5×10⁵ × CSS) |
| VC (5) | Error amplifier output / current limit threshold | Transconductance amplifier output; RC network here provides dominant pole compensation - directly sets current comparator trip level |
| SGND (6) | Small-signal ground | Reference for VFB, VREF, SYNC, SL/ADJ; must be low-impedance connection to COUT negative terminal |
| VFB (7) | Error amplifier inverting input | 1.25 V reference node; sources 0.5 µA bias - requires Thevenin resistance <5 kΩ to avoid output voltage error |
| VREF (8) | Bandgap reference decoupling | Internal 1.25 V reference; bypass with ≥0.1 µF capacitor to SGND to suppress noise coupling into feedback loop |
| SENSE+ (9) | Current sense amplifier inverting input | Connects to high-side (positive DC) of sense resistor - supports common-mode voltages up to 60 V |
| SENSE– (10) | Current sense amplifier noninverting input | Connects to low-side (negative DC) of sense resistor - differential input rejects common-mode noise |
| RUN/SHDN (11) | Shutdown enable with UVLO monitoring | 1.25 V precision threshold; 25 mV hysteresis; pulls GATE low and disables all circuitry when <1.15 V - usable for supply sequencing |
| PGND (12) | Power ground | Reference for GATE driver and internal power switches; tie directly to VIN decoupling cap negative terminal with low-inductance trace |
| GATE (13) | N-channel MOSFET gate driver output | 11.9 V swing with 60 ns transitions; drives high-Ciss FETs (e.g., IRFZ44 ×3) - no external bootstrap required |
| 12VIN (14) | Main power supply input | Accepts 10–15 V nominal; powers internal circuitry; bypass with ≥1 µF to PGND - not the converter input rail |
| SYNC (15) | Oscillator synchronization input | TTL-level compatible; triggers one-shot to lower CT high threshold to 2 V for ~200 ns - enables multi-controller phase alignment |
| 5VREF (16) | 5 V regulated output | Supplies timing components and external logic; load up to 10 mA DC; disabled during shutdown - bypass with ≥1 µF to SGND |
Key Features
| Feature | Design Value |
|---|---|
| 60 V sense common-mode range | Enables direct high-side current sensing on input rail - eliminates need for isolated amplifiers or sense blanking circuits |
| Programmable average current limit | Stable DC current regulation independent of ripple amplitude - maintains accuracy across 0–90% duty cycle |
| User-adjustable slope compensation | SL/ADJ pin allows fine-tuning of internal ramp slope - prevents subharmonic oscillation in high-duty-cycle boost designs |
| 5 V reference with 10 mA drive | Powers external timing resistors, feedback dividers, and logic - reduces need for auxiliary LDOs in compact power systems |
| Minimum off-time protection | ~1 µs forced dead time prevents shoot-through and switch overstress - inherent safety feature during overload or short-circuit |
| Soft start gated by UVLO/shutdown | SS capacitor discharge during fault events ensures controlled restart - avoids inrush current spikes on recovery |
Applications
| Industrial DC Power Supplies | Automotive On-Board Chargers |
|---|---|
Use Scenario: 12 V to 48 V step-up converter in factory automation PLCs requiring 250 W continuous output with battery backup. IC Role / Device Role / Timing Role: Primary boost controller managing N-channel MOSFET switching, current sensing, and output voltage regulation via feedback divider. Use Value: 60 V sense common-mode range allows direct input-side current monitoring - simplifies layout and improves reliability in noisy industrial environments. | Use Scenario: High-voltage DC bus generation in 12 V automotive systems powering ADAS cameras and radar modules. IC Role / Device Role / Timing Role: Current-mode controller regulating boost stage with programmable soft start and UVLO for cold-crank immunity. Use Value: RUN/SHDN pin's 1.25 V precision threshold enables seamless integration with vehicle battery monitoring - supports safe power sequencing during ignition cycles. |
| Lead-Acid Battery Backup Systems | Distributed Telecom Power |
Use Scenario: 24 V input to 48 V output converter in UPS units maintaining telecom equipment during grid outages. IC Role / Device Role / Timing Role: Average current-limited boost controller ensuring consistent charge delivery despite battery voltage sag. Use Value: Programmable average current limit (120 mV threshold) maintains stable DC current into aging batteries - extends runtime and prevents over-discharge. | Use Scenario: Compact 48 V intermediate bus converter in remote radio units with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Synchronized current-mode controller operating at 150 kHz to avoid sensitive RF bands while driving paralleled MOSFETs. Use Value: SYNC pin enables phase-aligned operation with other converters - reduces input ripple current and eases EMI filter design. |
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 60 V sense capability | Designed for bidirectional voltage regulation - unsuitable for unidirectional high-VIN boost where input exceeds 36 V | Select only if topology requires buck-boost and input stays ≤36 V; LT1680ISW#TRPBF remains preferred for >36 V boost-only systems |
| UCC28083DR | Fixed-frequency current-mode PWM controller (12–24 V typical); 5 V ref limited to 5 mA; no average current limit or 60 V sense | Targeted at AC-DC PFC front-ends - lacks high-VIN robustness and precision average limiting for DC-DC boost | Use only in cost-sensitive, lower-power (<100 W), lower-input-voltage applications where 60 V sensing is unnecessary |
Compared with LTC3780EFE#PBF and UCC28083DR, the LT1680ISW#TRPBF uniquely supports 60 V sense common-mode voltage and programmable average current limiting - making it the only viable choice for high-reliability, high-input-voltage industrial boost converters requiring precise DC current control.
Availability
LT1680ISW#TRPBF is available at Aetrix Electronics and suitable for industrial control systems, lead-acid battery backup systems, and automotive power conversion requiring stable component supply across extended temperature ranges.
Supply support for LT1680ISW#TRPBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT1680ISW#TRPBF belongs to Linear's legacy high-power DC/DC controller family, engineered specifically for ruggedized boost topologies in industrial, automotive, and telecom infrastructure where input voltage resilience and precise current limiting are critical.
FAQ
What is the maximum input voltage the LT1680ISW#TRPBF can handle on its SENSE pins?
The LT1680ISW#TRPBF supports a sense amplifier input common-mode voltage range of –0.3 V to 60 V. This allows direct high-side current sensing on input rails up to 60 V without isolation or level-shifting circuitry - a key differentiator for high-VIN boost applications. The 12VIN pin itself is rated only to 20 V and powers internal circuitry, not the converter input.
How does the average current limit function work in the LT1680ISW#TRPBF?
The LT1680ISW#TRPBF implements average current limiting via the IAVG pin, which hosts a 50 kΩ-output-impedance integrator. An external capacitor (e.g., 220 pF to VC) forms a single-pole filter that averages the sense amplifier output. When this average exceeds 120 mV across RSENSE, the VC pin is clamped - preventing further increase in current comparator threshold and enforcing stable DC current limiting independent of ripple.
Can the LT1680ISW#TRPBF be synchronized to an external clock, and what are the timing requirements?
Yes, the LT1680ISW#TRPBF supports oscillator synchronization via the SYNC pin, which accepts TTL-level signals up to 200 kHz. The SYNC input must have minimum on/off times of ≥1 µs (i.e., 10%–90% duty cycle at 100 kHz). Driving SYNC triggers a one-shot that lowers the CT pin high threshold from 2.5 V to 2 V for ~200 ns - enabling precise phase alignment across multiple controllers without external timing components.
What is the purpose of the SL/ADJ pin on the LT1680ISW#TRPBF?
The SL/ADJ pin on the LT1680ISW#TRPBF adjusts internal slope compensation to stabilize current-mode control at duty cycles above 50%. Resistive loading (e.g., divider from 5VREF) increases effective ramp slope; floating or tying to 5VREF disables additional compensation. This pin is essential for preventing subharmonic oscillation in high-duty-cycle boost converters - especially those operating near 90% duty cycle.
Does the LT1680ISW#TRPBF provide a regulated 5 V output, and what are its load capabilities?
Yes, the LT1680ISW#TRPBF provides a 5 V reference output at the 5VREF pin, specified from 4.75 V to 5.25 V over temperature, line, and load. It can supply up to 10 mA DC (20 mA pulsed) for biasing external timing resistors, feedback networks, or logic - but is disabled during shutdown. A minimum 1 µF bypass capacitor to SGND is required for stability.
LT1680ISW#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LT1680ISW#TRPBF FAQ
1.How can I place an order for LT1680ISW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1680ISW#TRPBF 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 LT1680ISW#TRPBF reliable?
The price and inventory of LT1680ISW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1680ISW#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1680ISW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1680ISW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1680ISW#TRPBF?
LT1680ISW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1680ISW#TRPBF 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 LT1680ISW#TRPBF?
For technical support, including LT1680ISW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1680ISW#TRPBF requirements.
6.How does Aetrix verify that LT1680ISW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1680ISW#TRPBF 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 LT1680ISW#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1680ISW#TRPBF?
All LT1680ISW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1680ISW#TRPBF, 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 LT1680ISW#TRPBF part is unused and in its original packaging.
Return procedure for LT1680ISW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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