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Analog Devices Inc. LTC1735CS#TRPBF
- Part No.:
- LTC1735CS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1735CS#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,338
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Product details
Overview
LTC1735CS#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller driving external N-channel MOSFETs in fixed-frequency current-mode operation. It delivers 0.8V to 6V output at up to 9A, supports 4V–30V input, features ±1% output voltage accuracy, OPTI-LOOP™ compensation, and Burst Mode™ for high efficiency at light loads.
For engineers reviewing the LTC1735CS#TRPBF datasheet, LTC1735CS#TRPBF pinout, LTC1735CS#TRPBF application, or LTC1735CS#TRPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support for industrial DC/DC power design.
Technical Context
The LTC1735CS#TRPBF implements a constant-frequency, peak-current-mode control architecture with dual N-channel gate drivers (TG and BG), internal 0.8V reference, and programmable foldback current limiting. Its ITH pin serves as the error amplifier output and current comparator threshold control point, enabling dynamic load transient response tuning via external compensation.
It supports three operating modes-Burst Mode™ (FCB ≥ 0.8V), forced continuous (FCB = GND), and synchronized cycle-skipping (FCB driven by external clock)-with selectable soft-start, remote sense, and overvoltage crowbar protection. The device uses OPTI-LOOP™ compensation to maintain stability across wide output capacitance and ESR ranges without loop re-tuning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 30V (36V absolute max); enables single-rail operation from 5V, 12V, or 24V industrial supplies. |
| Output Voltage Range | 0.8V to 6V; compatible with core voltages of modern microprocessors and FPGAs. |
| Output Voltage Accuracy | ±1% over temperature; ensures stable regulation for sensitive digital loads without margining overhead. |
| Switching Frequency | Programmable 265–335 kHz (COSC = 47 pF); balances MOSFET switching loss vs. inductor size in compact designs. |
| Peak Gate Drive Current | 3A per driver (TG/BG); supports fast turn-on of low-RDS(on) N-MOSFETs like FDS6680A in high-current converters. |
| Quiescent Shutdown Current | <25 µA (IQ); enables ultra-low-power standby in battery-backed or energy-conscious systems. |
| Duty Cycle Max | 99.4%; allows near-100% conduction for minimal dropout in high-VIN-to-low-VOUT applications. |
Pinout & Package
Package: 16-lead plastic SO (SO-16), JEDEC MS-012AC, 1.27 mm pitch, body size 10.3 × 7.5 mm. Thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COSC | Oscillator timing capacitor connection | External capacitor sets switching frequency; 47 pF yields ~300 kHz; enables synchronization when driven externally. |
| RUN/SS | Soft-start ramp and shutdown control | Capacitor to ground sets startup time (~1.25 s/µF); <1.5 V disables all circuitry including INTVCC and drivers. |
| ITH | Error amplifier output / current limit threshold | Voltage controls peak inductor current; 0–2.4 V range enables precise current limiting and loop compensation. |
| FCB | Forced continuous / sync input | GND = forced continuous mode; INTVCC = Burst Mode™; external clock = synchronized cycle-skipping. |
| VOSENSE | Feedback voltage input | Receives resistive divider output; servo-controlled to 0.8 V reference with ±1% accuracy and ±0.3% load regulation. |
| SENSE+, SENSE− | Current sense differential inputs | Measure voltage across RSENSE (e.g., 5 mΩ); set current limit threshold (75 mV max) with built-in offset. |
| TG, BG | Top/bottom N-MOSFET gate drivers | 3 A peak drive capability; TG is floating (bootstrap-referenced), BG is ground-referenced; supports synchronous rectification. |
| VIN, SW, PGND | Main power input / switch node / power ground | VIN powers internal LDO; SW connects to inductor and bootstrap diode; PGND carries high di/dt return current for bottom FET and CIN. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Enables >85% efficiency at 10 mA load by disabling switching until output capacitor discharge triggers restart. |
| OPTI-LOOP™ compensation | Allows stable loop response across 10× variation in output capacitance and ESR without redesigning compensation network. |
| Programmable foldback current limit | Reduces peak inductor current to ~25% of maximum when VOSENSE drops below 0.6 V, protecting against short-circuit stress. |
| Forced continuous control (FCB) | Eliminates switching noise and enables bidirectional current flow; required for secondary winding regulation in multi-output flyback-derived topologies. |
| Remote output voltage sensing | Compensates for IR drop in PCB traces or cables; maintains ±1% regulation at load point rather than at IC pins. |
Applications
| High-Efficiency Notebook Power | Industrial DC Distribution |
|---|---|
Use Scenario: Regulating 1.6 V/9 A CPU core supply from 12 V or 24 V rail in space-constrained notebook platforms. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing gate timing, current sensing, and transient response for high-current digital loads. Use Value: Burst Mode™ sustains >88% efficiency at 50 mA idle current; OPTI-LOOP™ ensures stability with low-ESR polymer capacitors used in thin-profile designs. |
Use Scenario: Point-of-load conversion in factory automation controllers requiring reliable 3.3 V/5 A supply from 24 V bus. IC Role / Device Role / Timing Role: Fixed-frequency current-mode controller delivering regulated output with remote sense and overvoltage crowbar protection. Use Value: ±1% output accuracy and 99.4% max duty cycle enable tight regulation under wide input variation; latched short-circuit shutdown prevents field failures. |
| Wireless Baseband Power | Telecom Line Card Supply |
Use Scenario: Generating 1.2 V/6 A supply for LTE baseband processors in small-cell radio units with thermal constraints. IC Role / Device Role / Timing Role: Synchronous buck controller with programmable soft-start and forced continuous mode for low-noise RF subsystems. Use Value: FCB pin enables forced continuous operation to eliminate switching noise near sensitive analog receivers; 300 kHz switching avoids critical IF bands. |
Use Scenario: Secondary-side 5 V/3 A supply in telecom line cards powered from isolated 48 V input via flyback transformer. IC Role / Device Role / Timing Role: Synchronous buck controller using secondary winding feedback (via FCB) to regulate main output while maintaining auxiliary bias. Use Value: FCB-driven secondary regulation eliminates optocoupler and TL431, reducing BOM count and improving transient response on main output. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | Integrated power stage (40 V, 3 A), no external MOSFETs; fixed 500 kHz frequency; no Burst Mode™ or OPTI-LOOP™. | Suitable for lower-current, cost-sensitive designs where board space is premium but efficiency at light load is secondary. | Select MP2315DJ-LF-Z only if output current ≤3 A and external MOSFETs are undesirable; not drop-in due to different pinout and control architecture. |
| LTC3850EGN#PBF | Higher VIN (4–38 V), dual-phase capable, 0.6 V reference, integrated MOSFET drivers with adjustable dead time; no Burst Mode™. | Targeted at higher-current (>15 A), multi-phase, or precision-adjustable applications where phase interleaving reduces input/output ripple. | Choose LTC3850EGN#PBF when scaling beyond 9 A or requiring dual-phase synchronization; requires full layout revision and new compensation. |
Compared with MP2315DJ-LF-Z and LTC3850EGN#PBF, the LTC1735CS#TRPBF uniquely combines external MOSFET flexibility, Burst Mode™ for sub-10 mA efficiency, and OPTI-LOOP™ for robustness across capacitor aging and temperature drift-making it optimal for mid-power industrial and computing DC/DC designs demanding both performance and long-term reliability.
Availability
LTC1735CS#TRPBF is available at Aetrix Electronics and suitable for notebook power supplies, industrial DC distribution systems, wireless baseband modules, and telecom line card designs requiring stable component supply with guaranteed long-term availability.
Supply support for LTC1735CS#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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application engineering for legacy Linear parts including the LTC1735 series.
The LTC1735 belongs to Linear's high-efficiency synchronous buck controller family, designed specifically for high-current, wide-input-voltage DC/DC conversion in portable and industrial systems where thermal management and light-load efficiency are critical.
FAQ
What is the maximum supported input voltage for the LTC1735CS#TRPBF?
The LTC1735CS#TRPBF has an absolute maximum input voltage rating of 36 V, with recommended continuous operation from 4 V to 30 V. Exceeding 30 V may reduce reliability or trigger undervoltage lockout recovery instability; always verify external MOSFET voltage ratings match the full 36 V transient envelope when designing with LTC1735CS#TRPBF.
Does the LTC1735CS#TRPBF include an internal voltage reference?
Yes, the LTC1735CS#TRPBF integrates a precision 0.8 V bandgap reference with ±1% accuracy over temperature. This reference is used directly by the error amplifier and VOSENSE feedback loop, eliminating need for external references and ensuring stable output regulation across its 0.8 V to 6 V output range.
Can the LTC1735CS#TRPBF operate in forced continuous mode?
Yes, the LTC1735CS#TRPBF supports forced continuous conduction mode by pulling the FCB pin to ground. This disables Burst Mode™, eliminates low-frequency switching noise, and enables bidirectional current flow-critical for secondary-winding regulation in multi-output topologies using LTC1735CS#TRPBF.
What package type is used for the LTC1735CS#TRPBF?
The LTC1735CS#TRPBF is housed in a 16-lead plastic SO (SO-16) package per JEDEC MS-012AC, with 1.27 mm lead pitch and thermal resistance θJA = 110°C/W. This package is pin-compatible with the LTC1735CGN (SSOP) and supports standard SOIC reflow profiles.
How does the OPTI-LOOP™ compensation work in the LTC1735CS#TRPBF?
OPTI-LOOP™ in the LTC1735CS#TRPBF dynamically adjusts compensation based on output capacitor ESR and capacitance value, allowing stable loop response across a 10× range without changing external RC components. This is implemented via internal transconductance amplifier gm = 1.3 mmho and adaptive slope compensation tied to ITH voltage, simplifying design for varying capacitor aging or temperature effects.
LTC1735CS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 30V
- Frequency - Switching:
- 300kHz
- Duty Cycle (Max):
- 99.4%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LTC1735CS#TRPBF FAQ
1.How can I place an order for LTC1735CS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1735CS#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 LTC1735CS#TRPBF reliable?
The price and inventory of LTC1735CS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1735CS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1735CS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1735CS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1735CS#TRPBF?
LTC1735CS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1735CS#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 LTC1735CS#TRPBF?
For technical support, including LTC1735CS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1735CS#TRPBF requirements.
6.How does Aetrix verify that LTC1735CS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1735CS#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 LTC1735CS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1735CS#TRPBF?
All LTC1735CS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1735CS#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 LTC1735CS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1735CS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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