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Analog Devices Inc. LTC3835IDHC-1#TRPBF
- Part No.:
- LTC3835IDHC-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3835IDHC-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,387
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Product details
Overview
LTC3835IDHC-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. It operates from 4V to 36V input, delivers 0.8V–10V output with ±1% accuracy, supports 140kHz–650kHz phase-lockable switching, and achieves 99% duty cycle for ultra-low dropout. It is used in telecom power supplies requiring stable 3.3V/5V rails with minimal standby loss.
For engineers reviewing the LTC3835IDHC-1#TRPBF datasheet, LTC3835IDHC-1#TRPBF pinout, LTC3835IDHC-1#TRPBF application, or LTC3835IDHC-1#TRPBF equivalent, key selection criteria include its 80μA no-load IQ, OPTI-LOOP® compensation for wide COUT/ESR tolerance, absence of PGOOD/CLKOUT/EXTVCC pins (vs. LTC3835), and DFN-16 (5mm × 3mm) package with exposed SGND pad.
Technical Context
The LTC3835IDHC-1#TRPBF implements a constant-frequency current-mode control architecture with internal 0.8V reference and transconductance error amplifier (gm = 1.55 mmho). Its ITH pin directly sets peak inductor current via voltage-controlled current comparator, enabling precise load regulation and fast transient response across 0.8V–10V output range.
It features three selectable light-load operating modes-Burst Mode® (≤80μA IQ), pulse-skipping, or forced continuous-controlled solely by the PLLIN/MODE pin voltage level. The absence of CLKOUT, PGOOD, and EXTVCC pins distinguishes it from the LTC3835 variant and simplifies layout at the cost of system-level monitoring and auxiliary bias capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V/24V battery systems and industrial DC distribution without pre-regulation. |
| Output Voltage Accuracy | ±1% over temperature - ensures tight regulation for sensitive digital loads like FPGAs and ASICs. |
| No-Load Quiescent Current | 80μA - extends battery life in always-on telecom or IoT edge nodes. |
| Switching Frequency Range | 140kHz to 650kHz (phase-lockable) - enables EMI-sensitive designs and compact magnetics selection. |
| Max Duty Cycle | 99.4% - allows operation with VIN as low as ~1.01×VOUT, critical for high-VOUT buck applications near dropout. |
| Current Sense Threshold | 80mV to 115mV - sets peak inductor current with programmable foldback limiting for short-circuit protection. |
| Soft-Start Charge Current | 0.75–1.35μA - enables precise ramp time control via external capacitor on TRACK/SS pin. |
Pinout & Package
Package: 16-lead (5mm × 3mm) plastic DFN with exposed SGND pad (Pin 17), rated for –40°C to +85°C operation. Exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PLLIN/MODE (16) | Mode select & sync input | Voltage level selects Burst Mode (≤0.7V), pulse-skipping (0.9V–INTVCC−0.5V), or forced continuous (tied to INTVCC); also accepts external clock for PLL synchronization. |
| SENSE+ (15) / SENSE– (14) | Differential current sense inputs | Measure voltage drop across external RSENSE to regulate peak inductor current; common-mode range up to 10V supports high-side sensing. |
| RUN (13) | Enable/disable control | Pull below 0.7V to shut down controller and reduce IQ to 10μA; internal pull-up enables automatic start-up. |
| SW (10) | Switch node connection | Connects to inductor and source of bottom MOSFET; swings from ground to VIN during operation. |
| TG (11) | Top gate driver output | Drives gate of high-side N-MOSFET with floating driver; voltage swing = INTVCC − 0.5V referenced to SW node. |
| BG (7) | Bottom gate driver output | Drives gate of low-side N-MOSFET; swings from PGND to INTVCC (5.25V typical). |
| TRACK/SS (3) | Soft-start & tracking input | Internal 1μA current source ramps external capacitor; output tracks smaller of 0.8V reference or applied voltage. |
| VFB (4) | Feedback input | Compares resistive divider output against 0.8V reference; ±1% accuracy maintained over full temperature range. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Minimizes required output capacitance and relaxes ESR constraints-enables use of ceramic capacitors without stability risk. |
| Adjustable Light-Load Operation | Three user-selectable modes (Burst, pulse-skip, continuous) optimize efficiency vs. noise/ripple trade-offs per application requirement. |
| 99.4% Max Duty Cycle | Enables high-VOUT operation (e.g., 10V out from 12V input) with minimal dropout loss and no external bootstrap assist needed. |
| Output Overvoltage Protection | Shuts off top MOSFET and turns on bottom MOSFET if VFB exceeds 10% above 0.8V-prevents damage to downstream logic or memory. |
| Low Dropout Detection | Forces periodic top-FET off-time during >95% duty cycle to recharge BOOST capacitor-ensures reliable gate drive under extreme dropout. |
Applications
| Telecom Power Supply | Automotive Infotainment Rail |
|---|---|
|
Use Scenario: Generating stable 3.3V/5V from 12V vehicle battery with cold-crank immunity (down to 4V). IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current POL conversion with adaptive light-load mode. Use Value: 80μA IQ preserves battery charge during vehicle sleep mode; 99.4% duty cycle maintains regulation during cranking transients. |
Use Scenario: Powering FPGA I/O banks and DDR memory interfaces in head-unit systems. IC Role / Device Role / Timing Role: Precision voltage controller with ±1% output accuracy and fast load-step response. Use Value: OPTI-LOOP® ensures stability with low-ESR ceramic output caps; soft-start prevents inrush current on hot-plug insertion. |
| Industrial IoT Gateway | Distributed DC Power System |
|
Use Scenario: Converting 24V field bus to 5V for microcontroller, radio, and sensor subsystems. IC Role / Device Role / Timing Role: High-efficiency step-down controller supporting wide input range and remote voltage tracking. Use Value: Phase-lockable frequency avoids EMI overlap with wireless comms bands; TRACK/SS enables coordinated startup with MCU supply. |
Use Scenario: Local regulation of 12V intermediate bus to 1.8V/3.3V for ASICs in modular server blades. IC Role / Device Role / Timing Role: Synchronous buck controller with current-mode loop for multi-phase scalability and current sharing. Use Value: Dual N-MOSFET drive supports discrete power stage optimization; foldback current limiting protects MOSFETs during short-circuit events. |
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 pinout and function but specified for 0°C to 85°C (E-grade); lacks guaranteed performance over –40°C. | Suitable for commercial indoor equipment where extended temperature range is not required. | Select when cost sensitivity outweighs industrial temperature assurance; verify thermal margin in enclosure. |
| MP2315DJ-LF-Z | Integrated 2A synchronous buck (not controller); fixed 3.3V/5V options; no phase-lock, no TRACK/SS, lower IQ (25μA). | Used in space-constrained consumer electronics where external MOSFETs are unnecessary. | Choose only for low-power, fixed-output applications-cannot replace LTC3835IDHC-1#TRPBF in high-current or adjustable-VOUT designs. |
Compared with LTC3835EDHC-1#TRPBF, the LTC3835IDHC-1#TRPBF guarantees full –40°C to +85°C operation and tighter parameter limits; compared with MP2315DJ-LF-Z, it offers design flexibility via external MOSFETs, adjustable frequency, and precision tracking-but requires more board area and layout expertise.
Availability
LTC3835IDHC-1#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, automotive infotainment systems, and industrial IoT gateways requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for LTC3835IDHC-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 its high-performance analog and power management portfolio with rigorous qualification standards and long-term product roadmaps.
The LTC3835-1 belongs to Linear's high-efficiency synchronous buck controller family, designed specifically for industrial, telecom, and automotive applications demanding ultra-low quiescent current, wide input range, and robust light-load efficiency without sacrificing transient performance.
FAQ
What is the operating temperature range for the LTC3835IDHC-1#TRPBF?
The LTC3835IDHC-1#TRPBF is specified for –40°C to +85°C ambient operation and is tested to guarantee all electrical parameters across this full industrial temperature range. Its DFN-16 package has θJA = 43.5°C/W, requiring adequate PCB copper area under the exposed pad for thermal management at full load.
Does the LTC3835IDHC-1#TRPBF support output voltage tracking?
Yes, the LTC3835IDHC-1#TRPBF supports output voltage tracking via its TRACK/SS pin. When an external resistor divider from a master supply is connected to this pin, the LTC3835IDHC-1#TRPBF regulates its VFB to match the applied voltage-enabling synchronized startup with other rails in multi-rail systems.
How does the LTC3835IDHC-1#TRPBF achieve 99.4% duty cycle?
The LTC3835IDHC-1#TRPBF achieves 99.4% duty cycle through internal dropout detection that forces brief top-FET off-times during sustained high-duty operation. This recharges the BOOST capacitor, maintaining gate drive integrity even when VIN approaches VOUT-critical for high-VOUT buck applications.
What are the key differences between LTC3835IDHC-1#TRPBF and LTC3835EDHC-1#TRPBF?
The LTC3835IDHC-1#TRPBF is the industrial-grade version with guaranteed –40°C to +85°C operation and tighter parametric limits; the LTC3835EDHC-1#TRPBF is commercial-grade (0°C to +85°C) with relaxed min/max specs. Both share identical pinout, package, and functional features.
Can the LTC3835IDHC-1#TRPBF be synchronized to an external clock?
Yes, the LTC3835IDHC-1#TRPBF supports external clock synchronization via its PLLIN/MODE pin. When driven by a clean square wave between 140kHz and 650kHz, the internal oscillator locks to the rising edge using the PLLLPF pin as loop filter node-enabling deterministic EMI reduction in dense power systems.
LTC3835IDHC-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN 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, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LTC3835IDHC-1#TRPBF FAQ
1.How can I place an order for LTC3835IDHC-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3835IDHC-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 LTC3835IDHC-1#TRPBF reliable?
The price and inventory of LTC3835IDHC-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 LTC3835IDHC-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3835IDHC-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3835IDHC-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3835IDHC-1#TRPBF?
LTC3835IDHC-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3835IDHC-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 LTC3835IDHC-1#TRPBF?
For technical support, including LTC3835IDHC-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3835IDHC-1#TRPBF requirements.
6.How does Aetrix verify that LTC3835IDHC-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3835IDHC-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 LTC3835IDHC-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3835IDHC-1#TRPBF?
All LTC3835IDHC-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3835IDHC-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 LTC3835IDHC-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3835IDHC-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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