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Analog Devices Inc. LTC3833EUDC#TRPBF
- Part No.:
- LTC3833EUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3833EUDC#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,494
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Product details
Overview
LTC3833EUDC#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 controlled on-time valley current mode architecture. It delivers ±0.67% output regulation over temperature, supports 4.5V–38V input and 0.6V–5.5V output, and enables fast transient response in computing and point-of-load systems.
For engineers reviewing the LTC3833EUDC#TRPBF datasheet, LTC3833EUDC#TRPBF pinout, LTC3833EUDC#TRPBF application, or LTC3833EUDC#TRPBF equivalent, key selection criteria include differential remote sensing capability (±500mV line loss compensation), 20ns minimum on-time, programmable 200kHz–2MHz switching frequency, and integrated overvoltage protection with power-good monitoring.
Technical Context
The LTC3833EUDC#TRPBF implements valley current mode control using a precision error amplifier (1.7 mS transconductance) and differential feedback path (VOSNS+ − VOSNS−) referenced to a 0.6V internal bandgap. Its controlled on-time architecture maintains constant frequency under steady-state conditions while enabling sub-100ns minimum off-time (90ns) and ultra-fast load transient recovery via direct ITH voltage modulation.
It supports dual current sensing methods-RSENSE or DCR-with programmable sense range (22–120mV) via VRNG pin, and integrates synchronized gate drivers (TG/BG) with matched dead-time control (15ns/20ns) to prevent shoot-through. Frequency programming is resistor-based (RT pin), and external clock synchronization is supported via MODE/PLLIN with ±30% lock range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V - supports wide industrial and computing supply rails without pre-regulation |
| Output Voltage Range | 0.6V to 5.5V - enables core voltage regulation for modern processors and FPGAs |
| Output Regulation Accuracy | ±0.67% over temperature - ensures stable rail delivery despite PCB trace resistance and thermal drift |
| Min On-Time / Off-Time | 20ns / 90ns - allows high VIN-to-VOUT conversion ratios (e.g., 36V→0.6V) at 2MHz |
| Switching Frequency Range | 200kHz to 2MHz - balances efficiency (low f) vs. size (high f) and EMI compliance |
| Differential Sensing Range | ±500mV line loss correction - compensates for IR drop across long PCB traces or connectors |
| Gate Driver Strength | TG pull-up: 2.5Ω, BG pull-down: 0.8Ω - drives large N-MOSFETs with low propagation delay |
Pinout & Package
20-pin (3mm × 4mm) plastic QFN package with exposed SGND pad (Pin 21), optimized for thermal performance and high-current layout. Pin pitch is 0.5mm; recommended reflow per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (Pin 1) | Open-drain power-good indicator | Asserts low when VOUT deviates >±7.5% from regulated setpoint - enables system sequencing and fault reporting |
| VOSNS+ / VOSNS− (Pins 6, 5) | Differential output voltage sense inputs | Measure remote feedback across output capacitor terminals - rejects ground noise up to ±500mV |
| SENSE+ / SENSE− (Pins 2, 3) | Differential current sense inputs | Interface with RSENSE or DCR filter - sets valley current threshold via ITH voltage |
| ITH (Pin 8) | Error amplifier output / current limit control | 0–2.4V analog control of peak-valley current threshold - used for loop compensation and current limiting |
| RT (Pin 10) | Frequency programming node | 1.2V reference sink - resistor to SGND sets free-running frequency from 200kHz to 2MHz |
| MODE/PLLIN (Pin 13) | Sync clock input / light-load mode select | Accepts external clock (200kHz–2MHz ±30%) or selects forced continuous/pulse-skipping operation |
| TG / BG (Pins 19, 17) | Top/bottom N-MOSFET gate drivers | High-current drivers with matched dead-time - eliminate external driver ICs in high-efficiency designs |
| BOOST (Pin 20) | Floating bootstrap supply | Charges external bootstrap capacitor during BG conduction - enables high-side N-MOSFET drive |
Key Features
| Feature | Design Value |
|---|---|
| Differential output sensing | Compensates for up to ±500mV remote ground offset - eliminates output voltage error from PCB IR drop |
| Controlled on-time valley current mode | Enables constant-frequency operation independent of VIN/VOUT/load - simplifies EMI filtering design |
| Programmable soft-start or output tracking | Internal 1µA TRACK/SS current source enables monotonic ramp-up or coordinated multi-rail sequencing |
| Overvoltage protection with PGOOD | Dedicated OV detection circuit forces BG high to clamp output - prevents damage to downstream loads |
| External VCC switchover | Auto-switches INTVCC supply from internal LDO to EXTVCC >4.6V - improves efficiency and reduces self-heating |
Applications
| Computing Systems | Point-of-Load Converters |
|---|---|
Use Scenario: Regulating CPU/GPU core voltages in servers and workstations with tight tolerance requirements. IC Role / Device Role / Timing Role: Primary step-down controller managing high-current, low-voltage rails with differential remote sensing. Use Value: ±0.67% regulation accuracy and 20ns min-on-time enable stable 0.6V–1.2V outputs even under dynamic 20A load steps. | Use Scenario: Local DC/DC conversion near ASICs, FPGAs, or memory modules on dense PCBs. IC Role / Device Role / Timing Role: High-efficiency synchronous buck controller with integrated gate drivers and thermal-aware layout. Use Value: 3mm×4mm QFN package and exposed SGND pad support compact, thermally robust point-of-load designs. |
| Distributed Power Systems | Datacomm Equipment |
Use Scenario: Intermediate bus converters feeding multiple downstream regulators in telecom shelf systems. IC Role / Device Role / Timing Role: Wide-input (4.5V–38V) controller supporting 12V or 48V intermediate buses with precise load sharing. Use Value: Programmable frequency synchronization avoids beat frequencies in multi-phase distributed architectures. | Use Scenario: Powering line cards, optical modules, and packet processing units in switches and routers. IC Role / Device Role / Timing Role: Fast-transient controller with pulse-skipping or forced continuous mode for bursty traffic loads. Use Value: 90ns min-off-time and valley current mode ensure rapid recovery from 0A→20A load steps within 5µs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2940AGQ-Z | Integrated MOSFETs (40V/12A), fixed 500kHz frequency, no differential sensing | Suitable for lower-current, space-constrained designs where external FETs are undesirable | Select when board area is critical and output current ≤12A; avoid if remote sensing or >20A capability required |
| ISL8113IRZ-T7A | Three-phase capable, supports up to 60A, requires external current-sense amplifiers | Targeted at high-current server VRMs with multi-phase interleaving and telemetry | Select for >30A applications needing phase interleaving; avoid for single-phase <25A due to complexity overhead |
Compared with MP2940AGQ-Z and ISL8113IRZ-T7A, the LTC3833EUDC#TRPBF uniquely combines differential remote sensing, 20ns min-on-time, and flexible current-sense architecture in a compact QFN - making it optimal for precision, high-current single-phase point-of-load designs where layout-induced ground offsets must be rejected.
Availability
LTC3833EUDC#TRPBF is available at Aetrix Electronics and suitable for computing systems, point-of-load converters, and distributed power systems requiring stable component supply, full production traceability, and long-term lifecycle support.
Supply support for LTC3833EUDC#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3833 belongs to Linear's high-efficiency synchronous buck controller product line, designed specifically for demanding point-of-load and intermediate bus applications requiring precision regulation, fast transient response, and robust thermal performance.
FAQ
What is the minimum on-time specification for LTC3833EUDC#TRPBF and why does it matter?
The LTC3833EUDC#TRPBF has a guaranteed minimum on-time of 20ns. This enables high step-down ratios (e.g., 36V input to 0.6V output) at high switching frequencies like 2MHz, which is essential for minimizing inductor and capacitor size in space-constrained computing and telecom applications. The 20ns spec is tested at VIN = 38V and VOUT = 0.6V, ensuring real-world usability in extreme conversion scenarios.
How does differential output sensing work in LTC3833EUDC#TRPBF?
The LTC3833EUDC#TRPBF uses dedicated VOSNS+ and VOSNS− pins to measure the voltage directly across the output capacitor terminals - not at the regulator's local ground. This rejects errors caused by PCB trace resistance between local and remote grounds, allowing accurate regulation even with up to ±500mV ground potential difference. The internal difference amplifier converts this to a single-ended signal referenced to the 0.6V internal bandgap.
Can LTC3833EUDC#TRPBF operate with only DCR current sensing?
Yes, the LTC3833EUDC#TRPBF fully supports DCR current sensing using an RC network across the inductor. SENSE+ and SENSE− connect to the RC filter nodes, and the VRNG pin configures the effective sense voltage range. This eliminates the need for a discrete sense resistor, reducing power loss and board area - especially valuable in high-current, high-efficiency designs where RSENSE losses would be significant.
What is the purpose of the EXTVCC pin on LTC3833EUDC#TRPBF?
The EXTVCC pin on LTC3833EUDC#TRPBF allows external powering of the INTVCC rail when voltage exceeds 4.6V. When active, it disables the internal LDO and connects EXTVCC directly to INTVCC, improving overall efficiency and reducing self-heating. This is commonly used by connecting the converter's own regulated output (if ≥4.6V) to EXTVCC - a technique that boosts light-load efficiency and thermal margin in high-power designs.
Does LTC3833EUDC#TRPBF support synchronization to an external clock?
Yes, the LTC3833EUDC#TRPBF supports external clock synchronization via the MODE/PLLIN pin. An external clock signal (200kHz–2MHz, within ±30% of the programmed RT frequency) locks the internal PLL to align TG turn-on edges. This feature is critical for noise-sensitive applications like datacom and medical equipment, where deterministic switching reduces EMI peaks and avoids interference with adjacent circuits or communication bands.
LTC3833EUDC#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):
- 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-QFN (3x4)
LTC3833EUDC#TRPBF FAQ
1.How can I place an order for LTC3833EUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3833EUDC#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 LTC3833EUDC#TRPBF reliable?
The price and inventory of LTC3833EUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3833EUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3833EUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3833EUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3833EUDC#TRPBF?
LTC3833EUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3833EUDC#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 LTC3833EUDC#TRPBF?
For technical support, including LTC3833EUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3833EUDC#TRPBF requirements.
6.How does Aetrix verify that LTC3833EUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3833EUDC#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 LTC3833EUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3833EUDC#TRPBF?
All LTC3833EUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3833EUDC#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 LTC3833EUDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3833EUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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