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Analog Devices Inc. LTC1735IGN#TRPBF
- Part No.:
- LTC1735IGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1735IGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:664
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Product details
Overview
LTC1735IGN#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 topology. It delivers 0.8V to 6V output at up to 9A with ±1% voltage accuracy, 4V–30V input range, and Burst Mode™ operation for high efficiency at light loads. It is used in notebook DC-DC power rails requiring precise low-voltage regulation and dynamic load response.
For engineers reviewing the LTC1735IGN#TRPBF datasheet, LTC1735IGN#TRPBF pinout, LTC1735IGN#TRPBF application, or LTC1735IGN#TRPBF equivalent, key selection criteria include its OPTI-LOOP™ compensation flexibility, forced continuous mode control via FCB pin, programmable soft-start, remote sense capability, and compatibility with 0.005Ω current-sense resistors for high-current designs.
Technical Context
The LTC1735IGN#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 output (ITH) directly controls peak inductor current, while VOSENSE feedback enables ±1% output regulation across line, load, and temperature.
It supports three operating modes: Burst Mode™ (FCB ≥ 0.8V) for ultra-low IQ (<25µA shutdown), forced continuous (FCB = GND), and synchronized external clock mode (FCB driven). Foldback current limiting activates below 70% VOUT, and overvoltage crowbar protection triggers at VOSENSE > 0.86V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 0.8V to 6V - set by external resistor divider on VOSENSE; compatible with microprocessor core voltages. |
| Input Voltage Range | 4V to 30V (36V abs max) - supports wide industrial and computing input rails including 5V, 12V, and 24V systems. |
| Reference Accuracy | ±1% over temperature - ensures stable output under thermal stress without calibration. |
| Switching Frequency | 265–335 kHz (COSC = 47pF) - programmable via external capacitor; synchronizable up to 500kHz. |
| Shutdown Current | <25 µA - enables battery-backed or always-on standby power domains. |
| Current Sense Threshold | 60–85 mV - sets peak inductor current limit; supports RSENSE = 0.005Ω for ~9A max output. |
| Duty Cycle Max | 99.4% - enables ultra-low dropout operation down to VIN – VOUT ≈ 100mV at high load. |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN), 5.3mm × 6.2mm body, 0.635mm 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 nominal operation. |
| RUN/SS | Soft-start ramp and shutdown control | Capacitor to ground sets startup time (~1.25s/µF); <1.5V forces shutdown and disables all functions. |
| ITH | Error amplifier output / current comparator threshold control | Voltage (0–2.4V) sets peak inductor current; clamped during foldback or overload. |
| FCB | Forced continuous/synchronization input | GND = forced continuous; INTVCC = Burst Mode™; external clock = sync + cycle-skipping. |
| VOSENSE | Feedback voltage input | Receives divided output voltage; regulates to 0.8V reference with ±1% accuracy. |
| SENSE+, SENSE− | Current sense differential inputs | Measure voltage across RSENSE; built-in offset enables accurate current limiting at 60–85mV. |
| TG, BG | Top and bottom N-MOSFET gate drivers | Drive external FETs with 3A peak current; TG uses floating bootstrap supply (BOOST). |
| VIN, SW, PGND, INTVCC, EXTVCC | Main power, switch node, power ground, internal LDO output, auxiliary VCC input | VIN powers control logic; SW connects to inductor; EXTVCC ≥4.7V bypasses INTVCC LDO for higher efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP™ compensation | Allows stable loop response across wide range of output capacitance and ESR values without redesigning compensation network. |
| Burst Mode™ operation | Reduces quiescent current to <25µA at light loads while maintaining regulated output; eliminates audible noise vs. pulse-skipping. |
| Forced continuous control (FCB pin) | Disables Burst Mode to ensure constant-frequency operation-critical for EMI-sensitive or secondary-winding-regulated supplies. |
| Remote output voltage sensing | Compensates for IR drop in PCB traces or connectors, enabling tight regulation at point-of-load. |
| Internal foldback current limiting | Automatically reduces peak current when VOUT drops below 70%, protecting FETs and inductor during short-circuit events. |
| Programmable soft-start | External capacitor on RUN/SS pin controls inrush current and enables controlled power-up sequencing with other rails. |
Applications
| Notebook CPU Core Power | Industrial DC Distribution |
|---|---|
|
Use Scenario: Regulating 1.6V/9A core voltage for Intel Pentium III-class processors in portable notebooks. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing gate drive timing, current sensing, and transient response for CPU load steps. Use Value: OPTI-LOOP™ compensation maintains stability with low-ESR polymer capacitors; Burst Mode™ extends battery life during idle states. |
Use Scenario: Generating 3.3V/5A rail from 24V industrial bus for PLC I/O modules with strict EMI limits. IC Role / Device Role / Timing Role: Fixed-frequency current-mode controller providing deterministic switching timing and predictable noise spectrum. Use Value: Forced continuous mode (via FCB = GND) eliminates variable-frequency artifacts; EXTVCC input improves efficiency by powering INTVCC from local 5V rail. |
| Wireless Baseband Power | PDA System Power Management |
|
Use Scenario: Supplying 2.5V/3A to RF transceiver ASIC in cellular base station card with tight ripple requirements. IC Role / Device Role / Timing Role: Synchronous buck controller delivering low-noise, low-ripple output using remote sensing and low-ESR ceramic output caps. Use Value: ±1% reference accuracy and remote sense ensure <±25mV regulation at load; 99.4% max duty cycle supports high-efficiency operation near dropout. |
Use Scenario: Dual-rail power solution (1.8V + 3.3V) in handheld PDA with battery input (3.6–4.2V) and dynamic load profiles. IC Role / Device Role / Timing Role: High-efficiency buck controller enabling long runtime via Burst Mode™ and programmable soft-start for sequenced rail bring-up. Use Value: Shutdown current <25µA preserves battery during sleep; RUN/SS-controlled soft-start prevents inrush into stacked Li-ion cells. |
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 (internal MOSFETs), 3A max, fixed 500kHz frequency, no Burst Mode™ | Suitable for lower-current, space-constrained designs where external FETs are undesirable | Select MP2315 if board area is critical and 3A output suffices; LTC1735IGN#TRPBF retains flexibility for >5A with optimized external FETs. |
| TPS54331DR | Integrated 3.5A FETs, adjustable frequency (100kHz–2.5MHz), Eco-mode™ instead of Burst Mode™, no remote sense | Better for high-frequency, compact designs needing fast transient response but lacking precision remote sensing | Choose TPS54331 for higher switching frequencies and smaller magnetics; LTC1735IGN#TRPBF offers superior light-load efficiency and sensing accuracy for sensitive loads. |
Compared with MP2315DJ-LF-Z and TPS54331DR, the LTC1735IGN#TRPBF provides higher current scalability, true remote sensing, and Burst Mode™ for sub-100µA IQ-making it optimal for high-performance, thermally constrained, or battery-sensitive applications where external FET optimization is justified.
Availability
LTC1735IGN#TRPBF is available at Aetrix Electronics and suitable for notebook power management, industrial DC distribution, and wireless infrastructure requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1735IGN#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, documentation, and manufacturing continuity for legacy Linear parts including the LTC series.
The LTC1735 belongs to Linear's high-efficiency synchronous buck controller family, designed specifically for demanding portable and embedded power applications requiring precision regulation, wide input range, and adaptive low-power modes.
FAQ
What is the maximum output current supported by the LTC1735IGN#TRPBF?
The LTC1735IGN#TRPBF itself does not deliver current-it controls external N-channel MOSFETs. With RSENSE = 0.005Ω and typical layout, it supports up to 9A average output current. Peak inductor current is limited to ~11A (75mV / 0.005Ω), and actual achievable current depends on FET selection, thermal design, and inductor saturation rating. The LTC1735IGN#TRPBF datasheet confirms this capability in Figure 1 and Electrical Characteristics tables.
Does the LTC1735IGN#TRPBF include an integrated power stage?
No, the LTC1735IGN#TRPBF is a controller-only IC with dual high-current gate drivers (TG and BG) for external N-channel MOSFETs. It does not integrate power switches. This architecture allows designers to optimize efficiency, thermal performance, and cost by selecting discrete FETs matched to specific voltage, current, and RDS(on) requirements. The LTC1735IGN#TRPBF datasheet explicitly states "drives external N-channel power MOSFETs" in the first paragraph of the description.
How does Burst Mode™ operation improve light-load efficiency in the LTC1735IGN#TRPBF?
Burst Mode™ reduces quiescent current by disabling both gate drivers when load demand falls below ~25% of full scale, allowing the output capacitor to supply energy until the error amplifier (ITH) rises above threshold. This cuts switching losses dramatically-achieving <25µA total shutdown current and >85% efficiency at 10mA load (per Figure G01/G02). The LTC1735IGN#TRPBF enters Burst Mode™ automatically when FCB ≥ 0.8V, and exits cleanly upon load increase.
Can the LTC1735IGN#TRPBF be synchronized to an external clock?
Yes-the FCB pin accepts an external clock signal (1.5VP–P minimum, 0.3µs high/low pulses) to synchronize the internal oscillator between 90% and 130% of its nominal frequency set by COSC. This enables noise spectral shaping and eliminates beat frequencies in multi-rail systems. The LTC1735IGN#TRPBF datasheet specifies this function in the "FCB" pin description and Figure 2, confirming lock range and timing requirements.
What package type is used for the LTC1735IGN#TRPBF?
The LTC1735IGN#TRPBF uses a 16-lead narrow plastic SSOP (GN) package, 5.3mm × 6.2mm body size, 0.635mm lead pitch, with no exposed thermal pad. This is confirmed in the "PACKAGE/ORDER INFORMATION" section of the datasheet, where "LTC1735IGN" maps to the GN package and "1735I" marking. Thermal resistance is θJA = 130°C/W, and the part is rated for –40°C to +85°C operation.
LTC1735IGN#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
LTC1735IGN#TRPBF FAQ
1.How can I place an order for LTC1735IGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1735IGN#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 LTC1735IGN#TRPBF reliable?
The price and inventory of LTC1735IGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1735IGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1735IGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1735IGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1735IGN#TRPBF?
LTC1735IGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1735IGN#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 LTC1735IGN#TRPBF?
For technical support, including LTC1735IGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1735IGN#TRPBF requirements.
6.How does Aetrix verify that LTC1735IGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1735IGN#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 LTC1735IGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1735IGN#TRPBF?
All LTC1735IGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1735IGN#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 LTC1735IGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1735IGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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