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Analog Devices Inc. LTC3833IFE#TRPBF
- Part No.:
- LTC3833IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3833IFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,330
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Product details
Overview
LTC3833IFE#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down DC/DC controller for high-power applications, driving all-N-channel MOSFETs with valley current mode control. It delivers ±0.67% output regulation via differential sensing, supports 4.5V–38V input and 0.6V–5.5V output, and operates at 200kHz–2MHz. Used in point-of-load converters for computing and datacomm systems requiring fast transient response and remote voltage sensing.
For engineers reviewing the LTC3833IFE#TRPBF datasheet, LTC3833IFE#TRPBF pinout, LTC3833IFE#TRPBF application, or LTC3833IFE#TRPBF equivalent, key selection criteria include its 20-pin TSSOP package, differential VOSNS+/VOSNS− sensing capability, 20ns minimum on-time, programmable current limit foldback, and compatibility with RSENSE or DCR current sensing topologies.
Technical Context
The LTC3833IFE#TRPBF implements controlled on-time valley current mode architecture, enabling constant-frequency operation independent of VIN, VOUT, and load while delivering fast load transients. Its internal error amplifier (gm = 1.7 mS) regulates VOSNS+ − VOSNS− to 0.6 V with ±0.67% accuracy over temperature.
Differential output sensing compensates for up to ±500 mV line loss between local and remote grounds. The device supports dual operating modes-pulse-skipping (discontinuous) when MODE/PLLIN = SGND, or forced continuous mode when MODE/PLLIN = INTVCC or driven by external clock-enabling EMI-sensitive system-level synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 38 V - supports wide industrial and telecom input rails without pre-regulation. |
| Output Voltage Range | 0.6 V to 5.5 V - enables core voltage regulation for modern processors and FPGAs. |
| Output Regulation Accuracy | ±0.67% over temperature - ensures stable power delivery under thermal stress in embedded systems. |
| Min. On-/Off-Time | tON(MIN) = 20 ns, tOFF(MIN) = 90 ns - allows near 0% and near 100% duty cycles for extreme input-output ratios. |
| Switching Frequency | 200 kHz to 2 MHz (programmable via RT resistor) - balances efficiency, size, and EMI performance across designs. |
| Current Sensing | RSENSE or DCR-based - eliminates need for dedicated sense resistors in high-current inductor paths. |
| Protection Features | Overvoltage protection, programmable current limit with foldback, PGOOD monitor - enables robust system-level fault handling without external circuitry. |
Pinout & Package
Package: 20-Lead Plastic TSSOP (FE), –40°C to 125°C operating junction temperature, exposed pad (Pin 21) connected to SGND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (Pin 17) | Open-drain power-good indicator | Asserts low when VOUT deviates >±7.5% from regulation point - used for system sequencing and fault reporting. |
| SENSE+ / SENSE− (Pins 18/19) | Differential current sense inputs | Kelvin-connected across sense resistor or DCR filter - enables accurate valley current measurement independent of PCB trace resistance. |
| VOSNS+ / VOSNS− (Pins 2/1) | Differential output voltage sense inputs | Connect to remote output terminals - corrects for up to ±500 mV ground offset, critical for distributed power architectures. |
| TRACK/SS (Pin 3) | Soft-start and output tracking input | Internal 1 µA pull-up charges external capacitor - sets controlled ramp time; also accepts external reference for master-slave sequencing. |
| ITH (Pin 4) | Error amplifier output / current threshold control | Voltage (0–2.4 V) sets valley current sense threshold - provides direct access to compensation network (RITH, CITH1). |
| TG / BG (Pins 15/13) | Top and bottom gate drivers | Drive N-channel MOSFETs with 2.5 Ω pull-up / 1.2 Ω pull-down (TG), 2.5 Ω / 0.8 Ω (BG) - supports high-speed switching with low dead-time (<20 ns). |
Key Features
| Feature | Design Value |
|---|---|
| Differential output sensing | Compensates for ±500 mV remote ground offset - eliminates output voltage error in multi-board or long-cable power distribution. |
| Valley current mode control | Enables fast transient response and inherent cycle-by-cycle current limiting - improves stability and reliability in high-dI/dt loads. |
| Programmable frequency & sync | 200 kHz–2 MHz via RT resistor; external clock sync on MODE/PLLIN - reduces EMI through frequency dithering or system-level timing alignment. |
| Flexible current sensing | Supports both discrete RSENSE and lossless DCR sensing - lowers BOM cost and improves efficiency in high-current (>20 A) designs. |
| Power management integration | INTVCC LDO + EXTVCC switchover, RUN pin with 3-state control (shutdown/standby/active), PGOOD - simplifies system power sequencing and monitoring. |
Applications
| Server VRM | Industrial PLC Power |
|---|---|
Use Scenario: Regulating 1.2 V/30 A CPU core voltage in a 1U rack server with tight thermal constraints and strict ripple requirements. IC Role / Device Role / Timing Role: Primary step-down controller managing all-N-channel MOSFETs, implementing valley current mode for sub-100 ns load-step response. Use Value: Differential sensing maintains ±0.67% regulation despite 300 mV PCB plane drop between VRM and CPU socket, ensuring silicon reliability. |
Use Scenario: Generating 3.3 V/15 A supply for I/O modules in an industrial programmable logic controller with 24 V nominal input and wide ambient temperature range. IC Role / Device Role / Timing Role: High-efficiency synchronous buck controller supporting forced continuous mode to avoid audible noise during light-load operation. Use Value: 20ns min on-time enables stable 3.3 V output from 24 V input at 500 kHz, reducing inductor size by 40% vs. legacy controllers. |
| Telecom Line Card | Test Equipment Power |
Use Scenario: Providing isolated 5 V/10 A auxiliary supply on a high-density telecom line card with shared ground planes and EMI-sensitive analog circuits. IC Role / Device Role / Timing Role: Synchronized buck controller locked to system clock via MODE/PLLIN pin - eliminates beat frequencies in RF sections. Use Value: External clock sync and <20 ns dead-time control suppress conducted EMI peaks by 12 dBµV in CISPR-22 Class B testing. |
Use Scenario: Programmable 1.8 V/25 A output in automated test equipment requiring precise voltage ramping and tracking across multiple rails. IC Role / Device Role / Timing Role: Dual-function TRACK/SS pin enables both soft-start and master-slave output tracking with <1% inter-rail skew. Use Value: Internal 1 µA soft-start current and rail-to-rail TRACK/SS voltage range (0–5 V) eliminate external DACs or op-amps in sequencing circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GQ-Z | Integrated MOSFETs (40 V, 12 A), fixed 500 kHz frequency, no differential sensing | Suitable for space-constrained mid-power designs where board area > precision regulation | Select MP2918GQ-Z only if integrated power stage suffices and remote sensing is unnecessary. |
| ISL8113IRZ-T7A | 40 V input, dual-phase capable, supports PMBus, requires external current sense amp | Targeted at multi-phase VRMs and digitally managed power systems | Choose ISL8113IRZ-T7A when phase interleaving or telemetry feedback is required. |
Compared with LTC3833IFE#TRPBF, MP2918GQ-Z trades differential sensing and programmability for integration and lower component count, while ISL8113IRZ-T7A adds digital control at the cost of increased BOM complexity and absence of built-in DCR sensing support.
Availability
LTC3833IFE#TRPBF is available at Aetrix Electronics and suitable for server VRMs, industrial PLCs, telecom line cards, and test equipment power supplies requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance.
Supply support for LTC3833IFE#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 LTC3833 belongs to Linear's high-performance power controller family, designed specifically for high-efficiency, high-current synchronous buck conversion in computing, telecom, and industrial applications demanding precision regulation and robust transient response.
FAQ
What is the function of the VOSNS+ and VOSNS− pins on the LTC3833IFE#TRPBF?
The VOSNS+ and VOSNS− pins on the LTC3833IFE#TRPBF provide differential output voltage sensing to compensate for ground potential differences between the controller and remote load. They connect directly to the positive and negative terminals of the output capacitor, enabling the LTC3833IFE#TRPBF to regulate output voltage with ±0.67% accuracy even with up to ±500 mV of ground offset - critical for distributed power systems and high-current PCB layouts.
Can the LTC3833IFE#TRPBF operate with only DCR current sensing, and what external components are required?
Yes, the LTC3833IFE#TRPBF fully supports DCR current sensing using an RC filter network across the inductor. Required components are a series RC network (RSENSE, CSENSE) connected between SENSE+ and SENSE−, sized per the DCR value and inductor ripple frequency. No additional amplifiers or resistors are needed - the LTC3833IFE#TRPBF's internal current comparator and VRNG pin allow seamless configuration for DCR or RSENSE sensing.
How does the RUN pin control enable and shutdown behavior in the LTC3833IFE#TRPBF?
The RUN pin on the LTC3833IFE#TRPBF offers three operational states: above 1.2 V enables full operation; between 0.75 V and 1.2 V places the device in standby (IQ ≈ 2 mA, drivers disabled); below 0.75 V activates micropower shutdown (IQ ≈ 15 µA). An internal 1.3 µA pull-up ensures reliable startup when released, and the LTC3833IFE#TRPBF internally pulls TRACK/SS low during RUN-initiated shutdown to prevent uncontrolled output ramping.
What is the purpose of the MODE/PLLIN pin on the LTC3833IFE#TRPBF, and how does it affect light-load efficiency?
The MODE/PLLIN pin on the LTC3833IFE#TRPBF serves dual functions: it enables external clock synchronization and selects light-load operating mode. When tied to SGND, the LTC3833IFE#TRPBF enters pulse-skipping mode for highest light-load efficiency; when tied to INTVCC or driven by an external clock, it forces continuous conduction mode to maintain constant frequency and minimize EMI. This flexibility allows optimization for either efficiency or noise performance based on system requirements.
Does the LTC3833IFE#TRPBF support external VCC biasing, and what are the benefits?
Yes, the LTC3833IFE#TRPBF supports external VCC biasing via the EXTVCC pin. When EXTVCC exceeds 4.6 V, the internal LDO shuts down and EXTVCC directly powers INTVCC, reducing self-heating and improving overall efficiency - especially beneficial when the output voltage is ≥4.6 V (e.g., 5 V or 12 V rails). This feature lowers thermal stress on the LTC3833IFE#TRPBF and increases system-level power density.
LTC3833IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) 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):
- 4.5V ~ 38V
- Frequency - Switching:
- 200kHz ~ 2MHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3833IFE#TRPBF FAQ
1.How can I place an order for LTC3833IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3833IFE#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 LTC3833IFE#TRPBF reliable?
The price and inventory of LTC3833IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3833IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3833IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3833IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3833IFE#TRPBF?
LTC3833IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3833IFE#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 LTC3833IFE#TRPBF?
For technical support, including LTC3833IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3833IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3833IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3833IFE#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 LTC3833IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3833IFE#TRPBF?
All LTC3833IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3833IFE#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 LTC3833IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3833IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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