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Analog Devices Inc. LTC1735CGN#TRPBF
- Part No.:
- LTC1735CGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1735CGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,737
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Product details
Overview
LTC1735CGN#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 architecture. 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™ operation for high efficiency at light loads.
For engineers reviewing the LTC1735CGN#TRPBF datasheet, LTC1735CGN#TRPBF pinout, LTC1735CGN#TRPBF application, or LTC1735CGN#TRPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support details specific to the GN-package 16-lead narrow SSOP variant.
Technical Context
The LTC1735CGN#TRPBF implements a constant-frequency, current-mode control architecture with dual N-channel gate drivers (TG and BG), internal 5.2V INTVCC regulator, and programmable foldback current limiting. Its error amplifier output (ITH) directly controls peak inductor current, while VOSENSE monitors feedback voltage against a precision 0.8V reference.
Burst Mode™ operation-enabled via FCB pin >0.8V-disables switching when ITH drops below 0.5V, reducing quiescent current to <25µA in shutdown. Forced continuous mode (FCB = GND) eliminates low-load noise but sacrifices efficiency; synchronization (FCB clocked 0.9–1.3× fOSC) enables deterministic timing and disables Burst Mode while retaining discontinuous conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 30V operating, 36V absolute max - supports wide industrial and telecom input rails without external pre-regulation. |
| Output Voltage Range | 0.8V to 6V - compatible with modern microprocessor core voltages and FPGA I/O rails. |
| Output Accuracy | ±1% over temperature - ensures stable regulation for sensitive digital loads without calibration. |
| Switching Frequency | 265–335kHz (COSC = 47pF), synchronizable up to 500kHz - balances MOSFET switching loss vs. inductor size. |
| Efficiency at Light Load | Up to 85% at 10mA (Burst Mode) - extends battery life in portable systems by minimizing idle power draw. |
| Duty Cycle Max | 99.4% - enables ultra-low dropout operation (e.g., 5V→4.95V) without external LDO supplementation. |
| Shutdown Current | <25µA - meets micropower requirements for always-on subsystems and wake-on-event designs. |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN), 6.2mm × 5.3mm, 0.65mm pitch, exposed pad not present. Thermal resistance θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COSC | Oscillator timing capacitor connection | External capacitor sets switching frequency; 47pF yields ~300kHz - direct control of efficiency/size trade-off. |
| RUN/SS | Soft-start ramp & shutdown enable | Capacitor to ground sets startup time (~1.25s/µF); <1.5V forces shutdown with full circuit disable including INTVCC. |
| ITH | Error amplifier output / current limit control | Voltage (0–2.4V) sets peak inductor current; used for loop compensation and current foldback activation. |
| FCB | Forced continuous/synchronization input | GND = forced continuous; INTVCC = Burst Mode; external clock = sync + cycle-skipping - single pin configures three operating modes. |
| VOSENSE | Feedback voltage input | Monitors resistive divider output; referenced to 0.8V internal bandgap - enables precise remote sensing of VOUT. |
| SENSE+, SENSE− | Current sense differential inputs | Measure voltage across RSENSE; built-in offset sets trip threshold - enables accurate current limiting independent of MOSFET RDS(on). |
| TG, BG | Top/bottom N-MOSFET gate drivers | 3A peak drive capability; TG is floating (bootstrap-referenced), BG is ground-referenced - supports high-efficiency synchronous rectification. |
| VIN, SW, BOOST, PGND | Main power, switch node, bootstrap supply, power ground | High-current paths requiring tight layout; BOOST must be decoupled with CB diode/capacitor - defines critical PCB routing zones. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP™ Compensation | Minimizes required output capacitance by enabling stable loop response across wide ESR ranges - reduces BOM count and board area. |
| Burst Mode™ Operation | Reduces no-load input current to <450µA and maintains >80% efficiency down to 10mA - eliminates need for auxiliary LDO in battery-powered systems. |
| Programmable Foldback Current Limit | Automatically reduces peak current when VOUT drops below 70% nominal - protects downstream circuits during short-circuit without external circuitry. |
| Forced Continuous Control Pin (FCB) | Enables noise-sensitive applications (e.g., RF sections) by disabling Burst Mode while retaining synchronous operation - avoids audible switching artifacts. |
| Remote Output Voltage Sense (VOSENSE) | Compensates for IR drop in PCB traces or connectors - ensures ±1% regulation at load point, not just at IC pins. |
| Internal 5.2V INTVCC Regulator | Eliminates need for external bias supply; EXTVCC option allows self-powering from converter output - simplifies system-level power architecture. |
Applications
| Notebook CPU Core Supply | Industrial DC Power Distribution |
|---|---|
Use Scenario: Providing 1.6V/9A core voltage to Intel Pentium M-class processors in ultraportable notebooks with thermal constraints. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing dynamic voltage scaling and rapid load transients. Use Value: Burst Mode™ sustains >82% efficiency at 50mA sleep current; 99.4% duty cycle enables 5V input → 4.95V output without dropout penalty. |
Use Scenario: Generating 3.3V/6A rail from 24V factory bus for PLC I/O modules requiring high reliability and EMI control. IC Role / Device Role / Timing Role: Fixed-frequency current-mode controller synchronized to system clock to avoid beat frequencies. Use Value: FCB-synchronized operation eliminates variable-frequency noise; OPTI-LOOP™ ensures stability with aging electrolytic output capacitors. |
| Wireless Baseband Power | Automotive Infotainment SoC Supply |
Use Scenario: Delivering 1.2V/5A to LTE baseband processors in cellular modems where standby current and thermal dissipation are critical. IC Role / Device Role / Timing Role: High-efficiency synchronous buck controller with programmable soft-start for sequenced power-up. Use Value: Shutdown current <25µA extends battery backup time; RUN/SS-controlled sequencing prevents latchup during cold start. |
Use Scenario: Regulating 1.8V/4A for automotive-grade application processors in head units, operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Automotive-qualified synchronous controller with undervoltage lockout (3.5V) and overvoltage crowbar protection. Use Value: Internal foldback current limiting and latched short-circuit shutdown meet ISO 7637-2 pulse immunity requirements without external components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | Integrated power stage (no external MOSFETs), 2A max output, fixed 500kHz frequency, no Burst Mode | Suitable for lower-current, space-constrained designs; lacks programmable frequency and light-load optimization | Select when board area is critical and output current ≤2A; avoid for >5A or battery-life-sensitive applications. |
| LTC3850EGN#PBF | Higher integration: includes MOSFET drivers, 2-phase capable, 0.6V reference, wider temp range (–40°C to 125°C) | Targeted at high-performance computing and automotive under-hood use; requires more complex compensation | Choose for multi-phase designs or extended temperature operation; not drop-in due to different pinout and control logic. |
Compared with MP2451DT-LF-Z and LTC3850EGN#PBF, the LTC1735CGN#TRPBF offers unique flexibility in frequency programming, superior light-load efficiency via Burst Mode™, and proven field reliability in notebook and telecom infrastructure - making it optimal for mid-power (3–10A), thermally constrained, and battery-aware systems.
Availability
LTC1735CGN#TRPBF is available at Aetrix Electronics and suitable for notebook CPU core supplies, industrial DC distribution systems, wireless baseband power, and automotive infotainment SoC supplies requiring stable component supply across long production lifecycles.
Supply support for LTC1735CGN#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1735CGN#TRPBF belongs to Linear's legacy high-efficiency DC/DC controller product line, designed specifically for synchronous step-down conversion in portable computing and telecom infrastructure where efficiency, thermal performance, and design flexibility are paramount.
FAQ
What is the maximum output current supported by the LTC1735CGN#TRPBF?
The LTC1735CGN#TRPBF is a controller-not an integrated regulator-so its output current depends on selected external MOSFETs, inductor, and layout. With appropriate FDS6680A MOSFETs and 2µH inductor, the LTC1735CGN#TRPBF achieves up to 9A continuous output in typical reference designs. Peak current is set by RSENSE (e.g., 0.005Ω yields ~75mV threshold), and thermal limits are governed by package θJA = 130°C/W.
Does the LTC1735CGN#TRPBF include an internal voltage reference?
Yes, the LTC1735CGN#TRPBF integrates a precision 0.8V bandgap reference with ±1% accuracy over temperature. This reference is used internally for the VOSENSE feedback comparator and is accessible only through the feedback loop-it is not a buffered output pin. The 0.8V value was selected for compatibility with future-generation microprocessors requiring lower core voltages.
How does Burst Mode™ operation improve efficiency at light loads in the LTC1735CGN#TRPBF?
In Burst Mode™, the LTC1735CGN#TRPBF disables both gate drivers when the ITH voltage falls below 0.5V, halting switching entirely. Load current is supplied solely by the output capacitor until voltage droop raises ITH above the 60mV hysteresis threshold, triggering a burst of switching cycles. This reduces average input current to <450µA at no load and maintains >80% efficiency down to 10mA-critical for battery runtime extension.
Can the LTC1735CGN#TRPBF be synchronized to an external clock, and what are the valid frequency ranges?
Yes, the LTC1735CGN#TRPBF supports synchronization via the FCB pin. When driven with a square wave having >1.3V high level (≥0.3µs) and <0.3V low level (≥0.3µs), it locks to external frequencies between 0.9× and 1.3× its nominal fOSC. For a 300kHz nominal frequency (COSC = 47pF), valid sync range is 270–390kHz. Attempting sync beyond 1.3× may cause slope compensation deficiency and instability.
What protection features are implemented in the LTC1735CGN#TRPBF?
The LTC1735CGN#TRPBF includes internal foldback current limiting (activated when VOUT drops below 70% nominal), output overvoltage crowbar (trip at VOSENSE >0.86V), latched short-circuit shutdown with CSS-based timeout, undervoltage lockout (3.5V on VIN), and bootstrap capacitor recharge management during dropout. These operate autonomously without external components, enhancing system robustness.
LTC1735CGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (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-SSOP
LTC1735CGN#TRPBF FAQ
1.How can I place an order for LTC1735CGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1735CGN#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 LTC1735CGN#TRPBF reliable?
The price and inventory of LTC1735CGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1735CGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1735CGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1735CGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1735CGN#TRPBF?
LTC1735CGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1735CGN#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 LTC1735CGN#TRPBF?
For technical support, including LTC1735CGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1735CGN#TRPBF requirements.
6.How does Aetrix verify that LTC1735CGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1735CGN#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 LTC1735CGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1735CGN#TRPBF?
All LTC1735CGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1735CGN#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 LTC1735CGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1735CGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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