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Analog Devices Inc. LT1680CN#PBF
- Part No.:
- LT1680CN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1680CN#PBF.pdf
- Description:
- IC REG CTRLR BST/FWRD CONV 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:123
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Product details
Overview
LT1680CN#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, supporting input voltages up to 60 V and fixed-frequency operation up to 200 kHz, used in industrial lead-acid battery backup systems and distributed power converters.
For engineers reviewing the LT1680CN#PBF datasheet, LT1680CN#PBF pinout, LT1680CN#PBF application, or LT1680CN#PBF equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply support for production-grade 48 V/5.2 A boost converter designs.
Technical Context
The LT1680CN#PBF implements a constant-frequency current-mode control architecture with internal oscillator synchronization capability up to 200 kHz and minimum off-time protection (~1 µs). Its transconductance error amplifier (1.25 V reference, 1200–3200 µmho gm) drives the VC pin to set peak current comparator threshold, enabling precise regulation via feedback at VFB.
It integrates programmable average current limiting (120 mV threshold at SENSE inputs, referenced to 10 V common mode), user-adjustable slope compensation via SL/ADJ pin, and undervoltage lockout with 9.0 V falling / 9.95 V rising thresholds and 350 mV hysteresis - all operating across 0°C to 70°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | –0.3 V to 60 V on SENSE+/-; –0.3 V to 20 V on 12VIN - enables direct high-side current sensing without blanking circuits in 12–48 V boost systems. |
| Switching Frequency | Programmable up to 200 kHz with RCT/CCT - supports compact magnetics and EMI-controlled layout in space-constrained industrial boards. |
| 5V Reference Output | 4.75–5.25 V at ≤10 mA DC load - powers external timing components and bias circuitry without auxiliary LDO. |
| Average Current Limit | 120 mV threshold at SENSE inputs - sets accurate DC input current limit independent of ripple, critical for battery charge current control. |
| GATE Drive Capability | 11.9 V output swing into ≥10,000 pF load - directly drives paralleled high-current N-MOSFETs (e.g., IRFZ44 ×3) without buffer stages. |
| Soft Start Current | ~8 µA sourced from SS pin - allows predictable ramp-up of output voltage using standard capacitor values (e.g., 0.1 µF → ~15 ms start time). |
| Operating Temperature | 0°C to 70°C ambient - validated for commercial-grade industrial control and telecom power systems. |
Pinout & Package
LT1680CN#PBF is housed in a 16-lead PDIP (N package) with 75°C/W junction-to-ambient thermal resistance. Pin assignments are electrically validated 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 stable >50% duty cycle operation; floating = default internal compensation. |
| CT (2) | Oscillator timing node | Connects to RCT (pull-up to 5VREF) and CCT (to SGND); sets frequency and minimum off-time. |
| IAVG (3) | Average current limit integrator | 50 kΩ output impedance forms single-pole filter with external cap; short to SGND disables avg limit. |
| SS (4) | Soft start ramp generator | Sources ~8 µA to external cap; clamped during UVLO/shutdown for graceful recovery. |
| VC (5) | Error amplifier output | Drives current comparator threshold; RC compensation here sets loop stability and transient response. |
| SGND (6) | Small-signal ground | Reference for VFB, VREF, and analog blocks; must be star-connected to minimize noise coupling. |
| VFB (7) | Error amp inverting input | Accepts 1.25 V reference feedback; 0.5 µA bias current requires Thevenin resistance <5 kΩ for accuracy. |
| VREF (8) | Bandgap reference decoupling | Internal 1.25 V ref; bypass with ≥0.1 µF to SGND to suppress noise on regulation loop. |
| SENSE+ (9) | Current sense inverting input | Connected to high-side of RSENSE; supports common-mode range up to 60 V for input-referenced sensing. |
| SENSE– (10) | Current sense non-inverting input | Connected to low-side of RSENSE; differential input rejects common-mode noise in high-dI/dt paths. |
| RUN/SHDN (11) | Precision shutdown enable | 1.25 V threshold with 25 mV hysteresis - usable for VIN sequencing or logic-level disable. |
| PGND (12) | Power ground | Return path for GATE driver and switch current; must be low-impedance trace to VIN bulk cap. |
| GATE (13) | N-MOSFET gate driver output | 11.9 V swing, 60–200 ns rise/fall - drives high-Ciss FETs directly; no external bootstrap needed. |
| 12VIN (14) | Main supply input | –0.3 V to 20 V rating; powers internal circuits and GATE driver; bypass with ≥1 µF to PGND. |
| SYNC (15) | Oscillator sync input | TTL-compatible; triggers one-shot to lower CT threshold for external clock alignment up to 200 kHz. |
| 5VREF (16) | 5 V reference output | 4.75–5.25 V at ≤10 mA; powers RCT, CCT, and local logic; disabled during shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable average current limiting | Enables precise DC input current control (e.g., 24 A max in 12 V→48 V/250 W design) without ripple interference. |
| User-adjustable slope compensation | Allows stable operation up to 90% duty cycle in high-input-voltage boost converters without subharmonic oscillation. |
| High-voltage current sense inputs | Supports 60 V common-mode range - eliminates need for isolated sense amplifiers or level-shifters in high-VIN applications. |
| Integrated 5 V reference with 10 mA drive | Reduces BOM count by powering external timing resistors/capacitors and monitoring circuitry directly. |
| Undervoltage lockout with hysteresis | Prevents erratic startup below 9 V and ensures clean re-enable above 9.95 V - critical for battery-backed systems with sagging rails. |
Applications
| Industrial Lead-Acid Backup | Distributed Power Conversion |
|---|---|
Use Scenario: 12 V battery bank stepping up to 48 V for telecom remote radio units during grid outage. IC Role / Device Role / Timing Role: Primary boost controller regulating output voltage while enforcing strict 24 A DC input current limit to prevent battery over-discharge. Use Value: Average current limiting ensures battery runtime predictability; 60 V sense range accommodates full battery voltage swing (10.5–14.4 V) without redesign. | Use Scenario: Midplane power architecture where 12 V backplane feeds multiple 48 V point-of-load modules. IC Role / Device Role / Timing Role: High-efficiency boost controller synchronizing to system clock via SYNC pin to reduce conducted EMI in dense PCB layouts. Use Value: 200 kHz sync capability enables deterministic switching across multiple converters, easing EMI filter design and compliance testing. |
| Automotive Auxiliary Power | High-Power Single-Board Systems |
Use Scenario: 24 V vehicle electrical system powering 48 V ADAS sensors requiring clean, regulated supply. IC Role / Device Role / Timing Role: Boost controller with RUN/SHDN pin configured for cold-crank detection - disables output when input drops below 9 V. Use Value: UVLO hysteresis (350 mV) prevents cycling during engine cranking transients; soft start avoids inrush into capacitive loads. | Use Scenario: All-in-one industrial controller board integrating 48 V motor drive, I/O, and communication interfaces. IC Role / Device Role / Timing Role: Central power controller delivering 250 W from compact 16-pin DIP footprint, leveraging integrated 5VREF for local logic biasing. Use Value: Single-chip solution reduces layout area vs discrete controller + LDO + supervisor; PDIP package simplifies manual assembly and thermal management. |
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 IN, ±4 V OUT adj); includes integrated gate drivers and current-mode control. | Supports buck-boost topology; not a pure boost controller; lacks 60 V sense range and average current limiting. | Choose LTC3780EFE#PBF only if bidirectional voltage conversion or input voltage below 10 V is required. |
| UC3843N | Fixed-frequency current-mode PWM controller (16 V max VCC); no integrated 5 V ref, no average current limit, no slope adjust, 1 MHz max freq. | Requires external 5 V bias; limited to ≤16 V supply; unsuitable for >30 V input or precision avg current control. | Choose UC3843N only for cost-sensitive, low-power (<50 W), low-input-voltage boost designs with relaxed accuracy needs. |
Compared with LTC3780EFE#PBF and UC3843N, the LT1680CN#PBF uniquely combines 60 V current sense capability, programmable average current limiting, and 5 V reference output in a single PDIP package - making it the only option validated for 12 V→48 V/250 W industrial backup systems requiring input current fidelity and high-VIN robustness.
Availability
LT1680CN#PBF is available at Aetrix Electronics and suitable for industrial lead-acid battery backup systems, distributed power converters, and automotive auxiliary power supplies requiring stable component supply across multi-year production cycles.
Supply support for LT1680CN#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. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs, with heritage from Linear Technology's precision power portfolio.
The LT1680CN#PBF belongs to ADI's high-power DC/DC controller product line, designed specifically for ruggedized boost converter applications demanding wide input voltage range, accurate current limiting, and industrial temperature operation.
FAQ
What is the maximum input voltage supported by the LT1680CN#PBF on its current sense pins?
The LT1680CN#PBF supports a current sense amplifier common-mode input range of –0.3 V to 60 V on SENSE+ and SENSE– pins. This allows direct high-side sensing on the input rail without level-shifting circuitry, critical for 48 V battery backup systems where input may reach 58 V during equalization charging. The 60 V rating is absolute maximum and validated across the 0°C to 70°C operating range.
Does the LT1680CN#PBF provide both peak and average current limiting?
Yes, the LT1680CN#PBF provides dual current limiting: a fixed 170–190 mV peak current threshold at the sense inputs, and a separately programmable average current limit with a typical 120 mV threshold. The average limit is implemented via the IAVG pin and external capacitor, and operates independently of ripple current - enabling precise DC current control in battery-fed boost converters where LT1680CN#PBF maintains consistent input current regardless of duty cycle.
Can the LT1680CN#PBF be synchronized to an external clock, and what are the timing requirements?
Yes, the LT1680CN#PBF supports oscillator synchronization via the SYNC pin, which accepts TTL-level signals up to 200 kHz. The SYNC input requires minimum on- and off-times of ≥1 µs (i.e., 10%–90% duty cycle at 100 kHz), and triggers an internal one-shot that lowers the CT pin threshold from 2.5 V to 2.0 V for ~200 ns. This allows deterministic phase alignment across multiple LT1680CN#PBF-based converters to reduce beat frequencies and simplify EMI filtering.
What is the purpose of the SL/ADJ pin on the LT1680CN#PBF, and how is it typically configured?
SL/ADJ (Pin 1) adjusts slope compensation magnitude for stable operation above 50% duty cycle. It is typically left unconnected for standard applications, tied to 5VREF for increased compensation, or driven by a resistor divider from 5VREF to fine-tune onset timing within the switching cycle. Excessive slope compensation reduces maximum achievable load current, so configuration must balance stability against current capability - a key design consideration in 12 V→48 V LT1680CN#PBF implementations.
How does the soft start function operate in the LT1680CN#PBF, and what external component sets its duration?
The LT1680CN#PBF soft start operates by sourcing a constant ~8 µA current from the SS pin to charge an external capacitor. As the SS pin voltage ramps, the internal VC clamp follows with a 100 mV dead zone, gradually increasing the current limit threshold and thus output voltage. Duration is set by CSS: tSS ≈ 1.5×10⁵ × CSS (e.g., 0.1 µF yields ~15 ms). The LT1680CN#PBF clamps SS to ground during UVLO or shutdown, ensuring repeatable startup behavior after fault recovery.
LT1680CN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
LT1680CN#PBF FAQ
1.How can I place an order for LT1680CN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1680CN#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 LT1680CN#PBF reliable?
The price and inventory of LT1680CN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1680CN#PBF is usually 5 days.
3.What payment methods are accepted for LT1680CN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1680CN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1680CN#PBF?
LT1680CN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1680CN#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 LT1680CN#PBF?
For technical support, including LT1680CN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1680CN#PBF requirements.
6.How does Aetrix verify that LT1680CN#PBF is sourced from the original manufacturer or authorized distributors?
All LT1680CN#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 LT1680CN#PBF meets industry standards.
7.What is the process for return or replacement of LT1680CN#PBF?
All LT1680CN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1680CN#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 LT1680CN#PBF part is unused and in its original packaging.
Return procedure for LT1680CN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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