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Analog Devices Inc. LTC3835EGN-1#TRPBF
- Part No.:
- LTC3835EGN-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3835EGN-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,637
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Product details
Overview
LTC3835EGN-1#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current synchronous step-down DC/DC controller driving dual N-channel MOSFETs in buck topologies. It operates from 4V to 36V input, delivers adjustable output from 0.8V to 10V with ±1% accuracy, and achieves 99% duty cycle for ultra-low dropout-enabling use in automotive battery systems and telecom power supplies.
For engineers reviewing the LTC3835EGN-1#TRPBF datasheet, LTC3835EGN-1#TRPBF pinout, LTC3835EGN-1#TRPBF application, or LTC3835EGN-1#TRPBF equivalent, key selection criteria include its 80μA no-load IQ, OPTI-LOOP® compensation for wide COUT/ESR tolerance, phase-lockable 140–650kHz switching, and absence of CLKOUT, EXTVCC, and PGOOD pins versus the standard LTC3835.
Technical Context
The LTC3835EGN-1#TRPBF implements a constant-frequency current-mode control architecture with internal 0.8V reference, precision error amplifier, and dual gate drivers (TG/BG) optimized for all-N-channel synchronous rectification. Its ITH pin controls peak inductor current via voltage-programmable current comparator threshold (80–115mV range), while TRACK/SS enables soft-start or supply tracking.
It features three selectable light-load operating modes-Burst Mode® (80μA IQ), pulse-skipping, or forced continuous-determined by PLLIN/MODE pin voltage. The absence of CLKOUT, EXTVCC, and PGOOD distinguishes it from the LTC3835 and restricts use in systems requiring clock synchronization feedback or auxiliary bias rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V/24V automotive batteries and telecom -48V derived rails. |
| Output Voltage Range | 0.8V to 10V - programmable via external resistor divider; ±1% accuracy ensures stable core logic or analog rail regulation. |
| No-Load Quiescent Current | 80μA - extends runtime in battery-powered digital devices and IoT edge nodes. |
| Switching Frequency | 140kHz to 650kHz (phase-lockable) - enables optimization of efficiency vs. size; default ~400kHz when PLLLPF floating. |
| Duty Cycle Max | 99.4% - supports ultra-low dropout operation down to VIN – VOUT ≈ 0.2V, critical for high-VIN, low-VOUT conversion. |
| Current Sense Threshold | 80mV to 115mV - sets peak inductor current; allows precise RSENSE selection for foldback-limited short-circuit protection. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive under-hood environments. |
Pinout & Package
Package: 16-Lead Plastic SSOP (GN), 1.0mm nominal height, exposed pad not present (unlike DFN variant). Thermal resistance θJA = 90°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PLLIN/MODE | Mode select & sync input | DC voltage selects Burst Mode (≤0.7V), pulse-skipping (0.9–INTVCC–0.5V), or forced continuous (tied to INTVCC); also accepts external clock for PLL lock. |
| SENSE+ / SENSE– | Differential current sense inputs | Measure voltage across RSENSE to regulate peak inductor current; common-mode range up to 10V supports high-side sensing. |
| RUN | Enable/disable control | Pull below 0.7V to shut down controller; reduces IQ to 10μA and disables INTVCC regulator. |
| TRACK/SS | Soft-start & tracking input | Internal 1μA pull-up charges external capacitor for linear VOUT ramp; also accepts resistor divider for supply tracking. |
| VFB | Feedback input | Compares divided output voltage against 0.8V reference; ±1% accuracy maintained over temp and line/load. |
| TG / BG | Top/bottom gate drivers | Drive external N-MOSFETs with 50ns rise/fall times; TG swings referenced to SW node; BG swings 0–INTVCC. |
| INTVCC | Internal LDO output | 5.25V ±5% regulated supply for drivers and logic; requires ≥4.7μF low-ESR capacitor to PGND. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable loop response across wide range of output capacitance (10μF–1000μF) and ESR (1mΩ–100mΩ), reducing design iterations. |
| Adjustable Light-Load Operation | Three distinct modes (Burst, pulse-skip, continuous) allow trade-off between efficiency, ripple, and EMI without changing layout. |
| Output Overvoltage Protection | Shuts off TG and turns on BG if VFB exceeds 10% above 0.8V, preventing damage to downstream 3.3V or 5V ICs during transients. |
| Very Low Dropout Capability | 99.4% max duty cycle enables VOUT = 3.3V from VIN = 3.4V - essential for post-regulation in multi-rail systems. |
| Current Foldback Limiting | Reduces MOSFET conduction time during short circuits, limiting thermal stress and enabling self-recovery without latch-off. |
Applications
| Automotive Infotainment Power | Telecom Intermediate Bus Converter |
|---|---|
Use Scenario: Powering FPGA I/O banks and DDR memory interfaces in head-unit ECUs with 12V battery input. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 1.2V/3A and 3.3V/2A rails with tight transient response. Use Value: 80μA IQ preserves battery life during vehicle sleep mode; 99% duty cycle maintains regulation during cold-crank (VIN = 6V). |
Use Scenario: Converting -48V telecom bus to +12V intermediate rail feeding multiple point-of-load converters. IC Role / Device Role / Timing Role: High-input-voltage step-down controller driving discrete N-MOSFETs in isolated or non-isolated topology. Use Value: 36V max VIN rating accommodates reflected transients; phase-lock capability synchronizes switching to system clock, reducing beat frequencies. |
| Industrial PLC I/O Module | Portable Test Equipment Supply |
Use Scenario: Generating isolated 5V and 24V auxiliary rails from 24V field bus in programmable logic controllers. IC Role / Device Role / Timing Role: Controller for secondary-side synchronous buck stages delivering clean, well-regulated outputs. Use Value: ±1% VOUT accuracy ensures sensor signal integrity; TRACK/SS enables coordinated startup with main processor rail. |
Use Scenario: Battery-powered handheld oscilloscope requiring low-noise 3.3V and 5V rails from single-cell Li-ion (2.7–4.2V). IC Role / Device Role / Timing Role: Efficient buck controller operating in Burst Mode at standby, transitioning to pulse-skip during measurement bursts. Use Value: 80μA IQ extends battery life >100 hours in sleep; adjustable frequency avoids audible noise in analog front-end circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3835EDHC-1#TRPBF | Same die, 3mm × 5mm DFN package with exposed thermal pad (θJA = 43.5°C/W); includes CLKOUT, EXTVCC, PGOOD pins. | Required where board space is constrained or thermal performance demands lower junction rise; supports clock distribution and auxiliary bias generation. | Select when PCB layout allows DFN and system needs PGOOD signaling or external clock fanout. |
| MP2315DJ-LF-Z | Monolithic 3A buck converter (integrated MOSFETs); fixed 3.3V/5V options; 30μA IQ; no phase-lock or TRACK/SS. | Suitable for cost-sensitive, low-complexity designs where 3A output suffices and external FET drive is unnecessary. | Choose for simplified BOM and layout when integrated solution meets voltage, current, and feature requirements. |
Compared with LTC3835EGN-1#TRPBF, the LTC3835EDHC-1#TRPBF offers superior thermal performance and added functionality at the cost of larger footprint and higher pin count, while the MP2315DJ-LF-Z trades flexibility and programmability for integration and lower component count.
Availability
LTC3835EGN-1#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, telecom power conversion, industrial PLCs, and portable test equipment requiring stable component supply with long lifecycle support.
Supply support for LTC3835EGN-1#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 the LTC portfolio.
The LTC3835-1 series was designed specifically for high-efficiency, low-IQ synchronous buck control in battery-powered and wide-input industrial systems - emphasizing thermal robustness, light-load optimization, and flexible start-up sequencing.
FAQ
What is the maximum duty cycle supported by the LTC3835EGN-1#TRPBF?
The LTC3835EGN-1#TRPBF supports up to 99.4% duty cycle, enabling operation in very low dropout conditions such as generating 3.3V from a 3.4V input. This is achieved through internal dropout detection that forces periodic bottom-FET conduction to recharge the bootstrap capacitor, maintaining gate drive integrity even near VIN ≈ VOUT.
Does the LTC3835EGN-1#TRPBF include PGOOD or CLKOUT functionality?
No, the LTC3835EGN-1#TRPBF does not include PGOOD, CLKOUT, or EXTVCC pins - these are omitted relative to the base LTC3835. This simplifies the pinout and reduces package complexity but means system-level power-good signaling and clock distribution must be implemented externally if required.
How does the TRACK/SS pin function during startup and fault conditions?
The TRACK/SS pin on the LTC3835EGN-1#TRPBF serves dual roles: during normal startup, an internal 1μA current charges an external capacitor to generate a linear voltage ramp, controlling VOUT slew rate; during RUN pin shutdown or UVLO, an internal MOSFET actively pulls TRACK/SS low to ensure controlled output discharge and prevent unintended re-start.
What are the absolute maximum ratings for the BOOST and SW pins on the LTC3835EGN-1#TRPBF?
The BOOST pin withstands voltages from INTVCC to (VIN + INTVCC), with absolute maximum of 42V. The SW pin handles swing from –5V (Schottky forward drop) to VIN, with absolute maximum of 36V. These ratings ensure safe operation with typical 30V-rated MOSFETs and 40V input transients in automotive applications.
Can the LTC3835EGN-1#TRPBF synchronize to an external clock, and what is the guaranteed lock range?
Yes, the LTC3835EGN-1#TRPBF can phase-lock to an external clock applied to the PLLIN/MODE pin. Its guaranteed synchronization range is 140kHz to 650kHz, with typical lock range extending to 115kHz–800kHz. An RC filter must be connected to PLLLPF to set loop bandwidth and ensure stable lock under varying load and temperature.
LTC3835EGN-1#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 ~ 36V
- Frequency - Switching:
- 250kHz ~ 530kHz
- Duty Cycle (Max):
- 99.4%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC3835EGN-1#TRPBF FAQ
1.How can I place an order for LTC3835EGN-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3835EGN-1#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 LTC3835EGN-1#TRPBF reliable?
The price and inventory of LTC3835EGN-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3835EGN-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3835EGN-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3835EGN-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3835EGN-1#TRPBF?
LTC3835EGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3835EGN-1#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 LTC3835EGN-1#TRPBF?
For technical support, including LTC3835EGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3835EGN-1#TRPBF requirements.
6.How does Aetrix verify that LTC3835EGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3835EGN-1#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 LTC3835EGN-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3835EGN-1#TRPBF?
All LTC3835EGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3835EGN-1#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 LTC3835EGN-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3835EGN-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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