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Analog Devices Inc. LTC3833EFE#TRPBF
- Part No.:
- LTC3833EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3833EFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,491
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Product details
Overview
LTC3833EFE#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down DC/DC controller driving all-N-channel MOSFETs in high-power point-of-load applications. It features differential output voltage sensing (±500 mV line loss compensation), ±0.67% output regulation over temperature, 20 ns minimum on-time, and programmable switching frequency from 200 kHz to 2 MHz. Used in computing and datacomm systems requiring fast transient response and stable 1.5 V/20 A output rails.
For engineers reviewing the LTC3833EFE#TRPBF datasheet, LTC3833EFE#TRPBF pinout, LTC3833EFE#TRPBF application, or LTC3833EFE#TRPBF equivalent, key selection criteria include valley current mode control architecture, RSENSE/DCR current sensing flexibility, differential remote sensing capability, and support for forced continuous or pulse-skipping light-load operation.
Technical Context
The LTC3833EFE#TRPBF implements controlled on-time valley current mode control with a precision 0.6 V internal reference and differential error amplifier (gm = 1.7 mS). Its PLL-based synchronization allows seamless locking to external clocks within ±30% of the programmed free-running frequency.
It supports dual current sensing methods - discrete sense resistor (RSENSE) or inductor DCR - via dedicated SENSE+/SENSE– inputs, while VOSNS+/VOSNS– pins enable true Kelvin remote output sensing with ±500 mV common-mode tolerance. The ITH pin serves as both current threshold control and loop compensation node.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 38 V - supports wide-input industrial and telecom power rails without pre-regulation. |
| VOUT Range | 0.6 V to 5.5 V - enables direct generation of core voltages (e.g., 1.5 V, 1.2 V, 0.9 V) for CPUs/FPGAs. |
| Output Regulation Accuracy | ±0.67% over –40°C to 125°C - ensures tight voltage compliance under thermal stress and load variation. |
| Min On/Off Time | tON(MIN) = 20 ns, tOFF(MIN) = 90 ns - enables high VIN/VOUT ratios (e.g., 36 V → 0.6 V) and near 0% or 100% duty cycles. |
| Switching Frequency | 200 kHz to 2 MHz (resistor-programmable) - balances efficiency, size, and EMI; synchronizable to external clock. |
| Current Sensing | RSENSE or DCR - eliminates need for dedicated sense resistors in cost-sensitive or high-efficiency designs. |
| Protection Features | Overvoltage protection (±7.5% PGOOD window), programmable current limit with foldback, and micropower shutdown (15 µA). |
Pinout & Package
Package: 20-Lead Plastic TSSOP (FE package), exposed pad (Pin 21) connected to SGND for thermal and electrical integrity. θJA = 38°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (Pin 1) | Open-drain power-good indicator | Asserts low when VOUT deviates >±7.5% from regulation point - enables system-level sequencing and fault reporting. |
| SENSE+ / SENSE– (Pins 2, 3) | Differential current sense inputs | Support Kelvin-connected RSENSE or RC-filtered DCR sensing - critical for accurate valley current mode control. |
| VOSNS+ / VOSNS– (Pins 6, 5) | Differential output voltage sense inputs | Enable remote sensing across PCB traces with up to ±500 mV ground offset - maintains regulation accuracy at load point. |
| TG / BG (Pins 15, 13) | Top/bottom N-MOSFET gate drivers | Drive external high-side and low-side switches; TG uses floating bootstrap supply (BOOST/SW nodes) for high-side bias. |
| RT (Pin 6) | Frequency programming input | Connects to SGND via resistor to set free-running frequency; also accepts external clock on MODE/PLLIN (Pin 9) for EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Differential output sensing | Compensates for up to ±500 mV IR drop between local and remote ground - essential for accurate regulation in distributed power systems. |
| Valley current mode control | Provides inherent cycle-by-cycle current limiting and fast transient response without slope compensation. |
| Programmable soft-start / output tracking | Internal 1 µA current source charges external capacitor on TRACK/SS (Pin 3) - enables controlled ramp-up or master-slave sequencing. |
| External VCC input (EXTVCC) | Accepts ≥4.6 V external supply to bypass internal LDO - reduces self-heating and improves efficiency in high-current designs. |
| Light-load operation modes | Selectable pulse-skipping (discontinuous) or forced continuous mode via MODE/PLLIN (Pin 9) - optimizes efficiency vs. EMI/noise trade-off. |
Applications
| Server VRMs | Telecom Point-of-Load |
|---|---|
|
Use Scenario: Regulating 1.2 V/15 A CPU core supply in 1U rack server with tight board space and thermal constraints. IC Role / Device Role / Timing Role: Primary step-down controller managing all-N-channel MOSFETs, implementing differential remote sensing at processor socket. Use Value: ±0.67% regulation accuracy and 20 ns min on-time ensure stable core voltage under dynamic load steps up to 10 A/µs. |
Use Scenario: Generating 3.3 V/12 A supply for FPGA I/O banks in 48 V telecom line card with strict EMI limits. IC Role / Device Role / Timing Role: Synchronous buck controller synchronized to system clock via MODE/PLLIN to suppress switching noise in sensitive analog sections. Use Value: 200 kHz–2 MHz frequency programming and external clock sync enable EMI filtering at fixed frequencies aligned with system timing. |
| Industrial PLC Power | Network Switch ASIC Supply |
|
Use Scenario: Providing 0.85 V/25 A supply to multi-core ARM SoC in ruggedized programmable logic controller operating from 24 V rail. IC Role / Device Role / Timing Role: High-efficiency controller using DCR current sensing to eliminate sense resistor losses and improve thermal performance. Use Value: RSENSE/DCR selectability and EXTVCC input reduce conduction losses and junction temperature rise in sealed enclosures. |
Use Scenario: Delivering tightly regulated 1.1 V/18 A supply to network switch ASIC with pre-biased start-up requirement. IC Role / Device Role / Timing Role: Controller supporting soft-start into pre-biased output via TRACK/SS pin - prevents reverse current during hot-swap events. Use Value: Internal 1 µA pull-up and voltage-clamped TRACK/SS input allow reliable start-up even when output capacitor is pre-charged. |
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 |
|---|---|---|---|
| LT8640S | Monolithic 42 V input, 6 A buck regulator (integrated MOSFETs); no differential sensing; higher IQ (2.5 µA shutdown). | Better for space-constrained, lower-current (<6 A) designs where integration outweighs sensing precision. | Choose LT8640S if board area is critical and remote sensing is unnecessary; LTC3833EFE#TRPBF preferred for >10 A, high-accuracy, or discrete FET flexibility. |
| MP2918 | 36 V input, 12 A controller with PMBus interface; ±1% output accuracy; no differential VOUT sensing; requires external DAC for tracking. | Suitable for digitally managed power systems needing telemetry and sequencing, not analog precision. | Choose MP2918 for digital power management ecosystems; LTC3833EFE#TRPBF remains optimal for analog-controlled, high-accuracy analog loads. |
Compared with LT8640S and MP2918, the LTC3833EFE#TRPBF uniquely delivers ±0.67% regulation with differential remote sensing, sub-100 ns dead-time control, and full design flexibility for high-current (>20 A), high-precision analog power rails - making it irreplaceable in performance-critical computing and telecom POL applications.
Availability
LTC3833EFE#TRPBF is available at Aetrix Electronics and suitable for server VRMs, telecom point-of-load converters, and industrial PLC power supplies requiring stable component supply across long production lifecycles.
Supply support for LTC3833EFE#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-current, high-accuracy synchronous buck regulation in computing, networking, and industrial systems demanding robust transient response and remote sensing fidelity.
FAQ
What is the operating temperature range for the LTC3833EFE#TRPBF?
The LTC3833EFE#TRPBF is rated for operation from –40°C to +125°C junction temperature. This grade (E-grade) is specified over 0°C to 85°C junction temperature in production testing, with full –40°C to 125°C performance assured by design, characterization, and statistical process controls per the datasheet. Thermal design must respect θJA = 38°C/W for the TSSOP package.
Does the LTC3833EFE#TRPBF support both RSENSE and DCR current sensing?
Yes, the LTC3833EFE#TRPBF supports both methods. SENSE+ and SENSE– pins accept Kelvin connections across either a discrete sense resistor or an RC filter placed across the inductor for DCR sensing. The VRNG pin selects the maximum sense voltage range (30 mV to 50 mV), enabling optimization for accuracy or power loss trade-offs in the LTC3833EFE#TRPBF design.
How does differential output sensing work on the LTC3833EFE#TRPBF?
The LTC3833EFE#TRPBF uses VOSNS+ and VOSNS– pins to measure the voltage difference directly across the output capacitor terminals - not at the converter's local ground. This compensates for up to ±500 mV IR drop in PCB traces or connectors between local and remote grounds. The internal difference amplifier forces (VOSNS+ − VOSNS–) to 0.6 V, ensuring precise regulation at the load point in the LTC3833EFE#TRPBF implementation.
Can the LTC3833EFE#TRPBF be synchronized to an external clock?
Yes, the LTC3833EFE#TRPBF supports external clock synchronization via the MODE/PLLIN pin (Pin 9). An external clock applied here locks the top-gate turn-on edge to its rising edge, provided the clock frequency is within ±30% of the free-running frequency set by the RT resistor. This feature is critical for EMI-sensitive applications and deterministic noise suppression in the LTC3833EFE#TRPBF system design.
What protection features are integrated into the LTC3833EFE#TRPBF?
The LTC3833EFE#TRPBF integrates output overvoltage protection (monitored via PGOOD with ±7.5% window), programmable valley current limit with foldback, undervoltage lockout on INTVCC (3.65 V release), and micropower shutdown (15 µA) via the RUN pin. These protections operate independently of loop stability and are active across the full temperature range, ensuring robust operation in the LTC3833EFE#TRPBF application.
LTC3833EFE#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
LTC3833EFE#TRPBF FAQ
1.How can I place an order for LTC3833EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3833EFE#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 LTC3833EFE#TRPBF reliable?
The price and inventory of LTC3833EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3833EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3833EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3833EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3833EFE#TRPBF?
LTC3833EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3833EFE#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 LTC3833EFE#TRPBF?
For technical support, including LTC3833EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3833EFE#TRPBF requirements.
6.How does Aetrix verify that LTC3833EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3833EFE#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 LTC3833EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3833EFE#TRPBF?
All LTC3833EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3833EFE#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 LTC3833EFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3833EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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