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Analog Devices Inc. LTC3835EUFD#TRPBF
- Part No.:
- LTC3835EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3835EUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,834
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Product details
Overview
LTC3835EUFD#TRPBF from Analog Devices (formerly Linear Technology) is a high-performance, constant-frequency current-mode synchronous step-down controller driving dual N-channel MOSFETs. It operates from 4V to 36V input, delivers up to 10V output with ±1% accuracy, supports phase-locked frequencies from 140kHz to 650kHz, and achieves 99% duty cycle for ultra-low dropout-ideal for telecom power supplies and battery-powered industrial systems.
For engineers reviewing the LTC3835EUFD#TRPBF datasheet, LTC3835EUFD#TRPBF pinout, LTC3835EUFD#TRPBF application, or LTC3835EUFD#TRPBF equivalent, key selection criteria include its 80µA no-load quiescent current, OPTI-LOOP® compensation for wide output capacitor/ESR tolerance, integrated PGOOD monitor, EXTVCC-enabled gate drive efficiency, and soft-start/tracking capability via dedicated TRACK/SS pin.
Technical Context
The LTC3835EUFD#TRPBF implements a current-mode control architecture with a precision 0.8V reference, internal transconductance amplifier (gm = 1.55 mmho), and adjustable ITH-based peak current limiting. Its PLLIN/MODE pin selects light-load operation mode-Burst Mode® (≤0.8V), pulse-skipping (>0.8V < INTVCC–0.5V), or forced continuous (tied to INTVCC)-enabling optimization of efficiency vs. ripple/noise trade-offs.
It integrates dual gate drivers (TG/BG) with 50ns/40ns typical rise/fall times, internal LDOs powering INTVCC from VIN (5.25V) or EXTVCC (7.5V), and robust protection including output overvoltage lockout (±12% VFB), current foldback, and undervoltage lockout (3.5V). The CLKOUT and PHASMD pins support PolyPhase® multi-phase synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V/24V battery systems and wide-input industrial rails. |
| Output Voltage Range | 0.8V to 10V - programmable via external resistor divider; 0.8V reference enables low-VOUT regulation. |
| No-Load Quiescent Current | 80µA - extends runtime in always-on battery-powered devices like IoT sensors. |
| Switching Frequency | 140kHz to 650kHz (phase-lockable) - balances efficiency (low f) and component size (high f). |
| Reference Accuracy | ±1% over temperature - ensures stable output voltage across –40°C to 85°C operating range. |
| Duty Cycle Max | 99.4% - enables near-dropout operation for minimal VIN–VOUT differential. |
| PGOOD Threshold | ±10% VFB trip level - provides reliable power-good signaling for system sequencing. |
Pinout & Package
Package: 20-pin (4mm × 5mm) plastic QFN (UFD), exposed thermal pad (Pin 21) soldered to SGND for thermal and electrical integrity. qJA = 37°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH | Error amplifier output / current limit control | Adjusts peak inductor current threshold; sets loop compensation via external RC network. |
| TRACK/SS | Soft-start and voltage tracking input | Internal 1µA pull-up charges external capacitor for linear VOUT ramp; accepts external divider for supply tracking. |
| VFB | Feedback voltage input | Compares divided output voltage against 0.8V reference; enables precise regulation and PGOOD monitoring. |
| SGND / PGND | Signal ground / power ground | Separate routing required: SGND for analog circuitry; PGND for high-current MOSFET return paths. |
| TG / BG | Top / bottom gate drivers | Drive external N-MOSFETs with fast transitions (50ns/40ns typ); TG floats on SW node using BOOST capacitor. |
| CLKOUT / PHASMD | Phase-synchronized clock output / phase select | Enables daisy-chained multi-phase operation; PHASMD configures TG-to-CLKOUT phase relationship. |
| EXTVCC | External VCC input for INTVCC LDO | Bypasses VIN-fed LDO when >4.7V applied; improves efficiency by sourcing gate drive from regulated output rail. |
| PGOOD | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from setpoint; requires external pull-up for logic-level interface. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Minimizes required output capacitance and ESR tolerance-supports ceramic, polymer, or electrolytic capacitors without instability. |
| Selectible Light-Load Modes | Burst Mode® (80µA IQ), pulse-skipping, or forced continuous-enables design-specific optimization of efficiency, ripple, and EMI. |
| Integrated Dual Gate Drivers | Drives high-side and low-side N-MOSFETs with matched timing (70ns sync delays) and 3A peak current capability. |
| Robust Protection Suite | Includes output overvoltage lockout (±12%), current foldback during short-circuit, UVLO (3.5V), and thermal shutdown (125°C). |
| PolyPhase® Synchronization | CLKOUT and PHASMD pins allow precise phase alignment across multiple controllers-reduces input/output ripple in multi-phase designs. |
Applications
| Telecom Power Supply | Automotive Infotainment System |
|---|---|
Use Scenario: 48V intermediate bus conversion to 3.3V/5V for baseband processors and FPGAs in 5G remote radio units. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating point-of-load voltage with tight transient response and low noise. Use Value: 80µA quiescent current reduces standby power loss; phase-lockable frequency avoids beat frequencies with other system clocks. | Use Scenario: 12V battery input conversion to 1.2V core voltage for SoCs and 3.3V for CAN/LIN interfaces in head unit ECUs. IC Role / Device Role / Timing Role: High-efficiency step-down controller with automotive-grade temp range (–40°C to 85°C) and robust fault handling. Use Value: EXTVCC support allows gate drive from 3.3V rail-reducing heat generation and improving overall system efficiency. |
| Industrial Battery Monitor | Distributed DC Power System |
Use Scenario: Portable battery-powered data logger with Li-ion (8.4V–12.6V) input powering 3.3V microcontroller and 5V sensor interface. IC Role / Device Role / Timing Role: Low-IQ buck controller enabling multi-week operation on single charge; TRACK/SS enables controlled startup sequence. Use Value: 99.4% max duty cycle sustains regulation down to 3.33V input-critical for deep battery discharge scenarios. | Use Scenario: 24V/48V DC distribution backbone supplying isolated 5V/12V rails to field I/O modules in PLC cabinets. IC Role / Device Role / Timing Role: Synchronous controller with PGOOD and soft-start for coordinated power-up across distributed nodes. Use Value: PGOOD output enables interlocked sequencing; CLKOUT synchronizes switching across multiple converters to reduce input capacitor stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3833EUFD#TRPBF | Fixed 300kHz frequency; no PLL or CLKOUT; no EXTVCC pin; 16-pin QFN package. | Lacks PolyPhase® sync and EXTVCC efficiency boost-suitable only for simpler, cost-sensitive single-phase designs. | Choose when phase synchronization and external VCC bypass are unnecessary and board space is constrained. |
| MP2918GL-Z | 4.5V–36V input; 0.6V–5.5V output; 100kHz–1MHz adjustable freq; no TRACK/SS or PGOOD; 20-pin QFN. | Missing soft-start/tracking and power-good signaling-requires external circuitry for sequencing and monitoring. | Consider for non-sequenced, non-monitored applications where lower BOM count outweighs feature loss. |
Compared with LTC3833EUFD#TRPBF and MP2918GL-Z, the LTC3835EUFD#TRPBF uniquely combines phase-lockable frequency, EXTVCC-enabled efficiency, TRACK/SS-controlled startup, and integrated PGOOD-making it optimal for complex, sequenced, multi-rail industrial and telecom power systems.
Availability
LTC3835EUFD#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, automotive infotainment systems, and industrial battery monitors requiring stable component supply and long-term production continuity.
Supply support for LTC3835EUFD#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.
The LTC3835EUFD#TRPBF belongs to Linear's high-efficiency synchronous controller family, designed specifically for demanding industrial, telecom, and automotive DC/DC conversion where low quiescent current, precise regulation, and multi-phase scalability are critical.
FAQ
What is the minimum input voltage required for LTC3835EUFD#TRPBF to operate?
The LTC3835EUFD#TRPBF has an undervoltage lockout (UVLO) threshold of 3.5V (typical), with guaranteed operation starting at 4V input. Below 3.5V, the controller disables all functions and draws only 10µA in shutdown. This ensures reliable startup from partially discharged batteries or unstable intermediate rails.
How does the EXTVCC pin improve efficiency in LTC3835EUFD#TRPBF designs?
The EXTVCC pin on the LTC3835EUFD#TRPBF allows the internal INTVCC LDO to be powered from an external regulated rail (e.g., 5V or 3.3V output) instead of VIN. When EXTVCC exceeds 4.7V, the controller switches from the 5.25V VIN-fed LDO to a 7.5V EXTVCC-fed LDO-reducing gate driver losses and improving overall converter efficiency, especially in high-VIN, low-VOUT applications.
Can LTC3835EUFD#TRPBF be used in multi-phase configurations?
Yes, the LTC3835EUFD#TRPBF supports multi-phase operation via its CLKOUT and PHASMD pins. CLKOUT provides a synchronized open-drain clock signal for daisy-chaining additional controllers, while PHASMD adjusts the phase offset between TG and CLKOUT-enabling precise interleaving for reduced input/output ripple and improved thermal distribution in high-current designs.
What is the purpose of the TRACK/SS pin on LTC3835EUFD#TRPBF?
The TRACK/SS pin on the LTC3835EUFD#TRPBF serves dual functions: soft-start and voltage tracking. An internal 1µA current source charges an external capacitor to generate a linear ramp, controlling VOUT rise time. Alternatively, connecting a resistor divider from another supply enables the LTC3835EUFD#TRPBF output to track that supply during startup-ensuring safe, sequenced power-up in multi-rail systems.
Does LTC3835EUFD#TRPBF support output voltages below 1V?
Yes, the LTC3835EUFD#TRPBF regulates based on a precision 0.8V internal reference, enabling output voltages as low as 0.8V. With appropriate external feedback resistors and layout attention to noise immunity, stable sub-1V outputs (e.g., 0.85V, 0.9V) are achievable-making it suitable for modern low-voltage SoC core supplies.
LTC3835EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- 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, Phase Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x5)
LTC3835EUFD#TRPBF FAQ
1.How can I place an order for LTC3835EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3835EUFD#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 LTC3835EUFD#TRPBF reliable?
The price and inventory of LTC3835EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3835EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3835EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3835EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3835EUFD#TRPBF?
LTC3835EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3835EUFD#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 LTC3835EUFD#TRPBF?
For technical support, including LTC3835EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3835EUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3835EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3835EUFD#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 LTC3835EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3835EUFD#TRPBF?
All LTC3835EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3835EUFD#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 LTC3835EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3835EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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