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Analog Devices Inc. LTC1735EGN#TRPBF
- Part No.:
- LTC1735EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1735EGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,704
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Product details
Overview
LTC1735EGN#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 - used in notebook power rails and DC distribution systems.
For engineers reviewing the LTC1735EGN#TRPBF datasheet, LTC1735EGN#TRPBF pinout, LTC1735EGN#TRPBF application, or LTC1735EGN#TRPBF equivalent, key selection criteria include programmable frequency via COSC, forced continuous mode control (FCB), remote sense capability, foldback current limiting, and compatibility with 0.005Ω RSENSE for precise current monitoring in high-current buck designs.
Technical Context
The LTC1735EGN#TRPBF implements a constant-frequency, current-mode control architecture with dual N-channel gate drivers (TG/BG), internal 5.2V INTVCC regulator, and precision 0.8V reference. Its error amplifier (EA) drives ITH to modulate peak inductor current, while SENSE+ and SENSE− pins monitor RSENSE for cycle-by-cycle current limiting.
Burst Mode™ activates when ITH falls below 0.86V (FCB ≥ 0.8V), clamping peak current to ~20mV/RSENSE and disabling switching until output droop triggers recovery; forced continuous mode (FCB ≤ 0.76V) eliminates burst noise and enables bidirectional current flow, critical for secondary winding regulation in multi-output converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 30V operating, 36V absolute max - supports wide-input industrial and telecom supplies. |
| Output Voltage Range | 0.8V to 6V set by external resistor divider - compatible with low-voltage microprocessors and ASIC cores. |
| Reference Accuracy | ±1% over temperature - ensures stable output under load/line/temperature variation without calibration. |
| Switching Frequency | Programmable 265–335kHz (COSC = 47pF); synchronizable up to 500kHz - balances efficiency vs. size in compact layouts. |
| Current Sense Threshold | 75mV max (G-grade), adjustable via RSENSE - enables accurate current limiting down to 0.005Ω for 9A applications. |
| Duty Cycle Max | 99.4% - supports ultra-low dropout operation near VIN ≈ VOUT, e.g., 5V→4.9V at full load. |
| Shutdown Current | <25µA (IQ) - preserves battery life in portable systems during standby. |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN), 5.3mm × 6.2mm, 0.65mm pitch, exposed pad not electrically connected. Thermal resistance θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COSC | Oscillator timing capacitor node | Connects to ground via external capacitor (e.g., 47pF) to set switching frequency; enables sync via FCB pin. |
| RUN/SS | Soft-start ramp & shutdown control | Capacitor to ground sets soft-start time (~1.25s/µF); pulled low disables all functions including INTVCC. |
| ITH | Error amplifier output / current limit control | Voltage (0–2.4V) sets peak inductor current threshold; directly modulated by feedback loop for transient response. |
| FCB | Forced continuous / sync input | Ground = forced continuous; INTVCC = Burst Mode; external clock = synchronization + cycle-skipping. |
| VOSENSE | Feedback voltage input | Receives divided output voltage; referenced to 0.8V internal bandgap - enables remote sensing for load regulation. |
| SENSE+, SENSE− | Current sense differential inputs | Measure voltage across RSENSE; built-in offset sets trip point - supports accurate current limiting independent of VOUT. |
| TG, BG | Top/bottom N-MOSFET gate drivers | High-current (3A peak), fast transition (<90ns) outputs - drive external FETs with minimal dead-time risk. |
| VIN, SW, BOOST, PGND, SGND, INTVCC, EXTVCC | Power and ground terminals | VIN powers control logic; SW connects to inductor/diode; BOOST supplies floating top driver; PGND/SGND separation reduces noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP™ compensation | Minimizes required output capacitance by optimizing loop stability across wide ESR/capacitance ranges - reduces BOM count and board area. |
| Burst Mode™ operation | Enables >85% efficiency at 10mA load (VIN=15V, VOUT=3.3V) - extends battery runtime in always-on portable devices. |
| Programmable foldback current limit | Reduces peak current to ~25% of max when VOSENSE drops below 0.6V - protects against short-circuit without thermal runaway. |
| Remote output voltage sensing | Compensates for IR drop in PCB traces and connectors - maintains ±1% regulation at point-of-load in high-current systems. |
| Internal 5.2V INTVCC regulator with EXTVCC switchover | Accepts external 4.7–7V supply to bypass internal LDO - improves efficiency and gate drive strength when primary/secondary rail is available. |
Applications
| Point-of-Load Regulation for Microprocessors | DC Power Distribution in Telecom Systems |
|---|---|
|
Use Scenario: Regulating 1.6V/9A core voltage for Intel Pentium III-class CPUs in notebooks with tight thermal constraints. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing external FDS6680A MOSFETs, using RSENSE = 0.005Ω and COSC = 47pF for 300kHz operation. Use Value: OPTI-LOOP™ allows use of low-ESR polymer capacitors (e.g., Panasonic EEFUEOG181R) without instability, reducing output ripple to <20mVpp under 9A load steps. |
Use Scenario: Generating 3.3V/5A intermediate bus in 48V telecom rectifier modules requiring high efficiency across 10%–100% load range. IC Role / Device Role / Timing Role: Fixed-frequency current-mode controller synchronized to system clock via FCB pin to eliminate beat frequencies in dense power stacks. Use Value: Forced continuous mode (FCB = GND) eliminates audible noise and enables seamless current sharing with parallel converters in redundant PSUs. |
| Portable Device Main Power Rail | Industrial Motor Drive Auxiliary Supply |
|
Use Scenario: Converting 12V battery to 5V/3A for display backlight and interface ICs in handheld medical instruments. IC Role / Device Role / Timing Role: High-efficiency synchronous controller using Burst Mode™ below 50mA to extend lithium-ion battery life beyond 12 hours. Use Value: Shutdown current <25µA and undervoltage lockout (3.5V) prevent brownout damage during battery depletion cycles. |
Use Scenario: Providing isolated 15V/1A gate drive supply from 24V DC bus in servo amplifier PCBs with strict EMI limits. IC Role / Device Role / Timing Role: Controller operating in continuous mode with EXTVCC powered from secondary winding - eliminates need for separate LDO. Use Value: INTVCC switchover reduces power loss by 120mW vs. internal LDO, lowering junction temperature in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3741EFE#PBF | Integrated 4A MOSFETs, 4–40V input, no RSENSE - monolithic vs. controller-only topology. | Suitable for lower-current (≤4A), space-constrained designs where external FET layout is impractical. | Select LT3741EFE#PBF only if output current ≤4A and board area is premium; LTC1735EGN#TRPBF retains flexibility for 9A+ with optimized FET selection. |
| TPS40200DGQ | Fixed 300kHz, no Burst Mode, 4.5–28V input, 1.23V reference - lower integration, no OPTI-LOOP™. | Used in cost-sensitive industrial supplies where light-load efficiency is secondary to BOM simplicity. | Choose TPS40200DGQ for non-battery applications needing basic functionality; LTC1735EGN#TRPBF preferred when remote sense, ±1% accuracy, or Burst Mode are required. |
Compared with LT3741EFE#PBF and TPS40200DGQ, the LTC1735EGN#TRPBF offers superior light-load efficiency via Burst Mode™, tighter output regulation (±1% vs. ±2%), and design flexibility through external MOSFET control - essential for high-current, thermally constrained, or multi-rail systems.
Availability
LTC1735EGN#TRPBF is available at Aetrix Electronics and suitable for notebook computing, telecom power distribution, and portable medical device applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1735EGN#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 its high-performance analog and power management portfolio with rigorous automotive and industrial qualification standards.
The LTC1735EGN#TRPBF belongs to Linear's synchronous buck controller family designed for high-efficiency, high-current DC/DC conversion in space- and thermal-constrained portable and infrastructure equipment.
FAQ
What is the maximum supported input voltage for the LTC1735EGN#TRPBF?
The LTC1735EGN#TRPBF has an absolute maximum input voltage rating of 36V, with recommended operating range of 4V to 30V. Exceeding 36V risks permanent damage to internal circuitry, especially the VIN, SW, and BOOST pins. For 36V nominal systems, derating or input clamping is advised.
Does the LTC1735EGN#TRPBF support remote voltage sensing?
Yes, the LTC1735EGN#TRPBF supports true remote sensing via dedicated VOSENSE, SENSE+, and SENSE− pins. This allows feedback to be taken directly at the load, compensating for PCB trace resistance and maintaining ±1% regulation accuracy even with 100mΩ path impedance.
How does Burst Mode™ operation improve light-load efficiency in the LTC1735EGN#TRPBF?
Burst Mode™ in the LTC1735EGN#TRPBF disables switching when ITH falls below 0.5V, supplying load current solely from COUT until voltage droop triggers resumption. This reduces switching losses dramatically - achieving >85% efficiency at 10mA (VIN=15V, VOUT=3.3V) versus ~65% in forced continuous mode.
What package type is used for the LTC1735EGN#TRPBF?
The LTC1735EGN#TRPBF uses a 16-lead narrow plastic SSOP (GN) package, 5.3mm × 6.2mm body size with 0.65mm lead pitch. It is RoHS-compliant, halogen-free, and rated for operation from –40°C to 85°C ambient temperature.
Can the LTC1735EGN#TRPBF be synchronized to an external clock?
Yes, the LTC1735EGN#TRPBF can be synchronized to an external clock applied to the FCB pin. The internal oscillator locks to input frequencies between 90% and 130% of its nominal value (e.g., 270–390kHz for COSC=47pF), with timing edges aligned to the rising edge of the external signal.
LTC1735EGN#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1735EGN#TRPBF FAQ
1.How can I place an order for LTC1735EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1735EGN#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 LTC1735EGN#TRPBF reliable?
The price and inventory of LTC1735EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1735EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1735EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1735EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1735EGN#TRPBF?
LTC1735EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1735EGN#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 LTC1735EGN#TRPBF?
For technical support, including LTC1735EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1735EGN#TRPBF requirements.
6.How does Aetrix verify that LTC1735EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1735EGN#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 LTC1735EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1735EGN#TRPBF?
All LTC1735EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1735EGN#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 LTC1735EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1735EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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