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Analog Devices Inc. LTC3833EUDC#PBF
- Part No.:
- LTC3833EUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3833EUDC#PBF.pdf
- Description:
- IC REG CTRLR BUCK 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,018
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Product details
Overview
LTC3833EUDC#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-down DC/DC controller driving all-N-channel MOSFETs for high-power point-of-load conversion. It features differential output sensing (±500mV line-loss compensation), ±0.67% output regulation over temperature, 20ns minimum on-time, and programmable 200kHz–2MHz switching frequency - enabling stable 1.5V/20A supplies in computing and datacomm systems.
For engineers reviewing the LTC3833EUDC#PBF datasheet, LTC3833EUDC#PBF pinout, LTC3833EUDC#PBF application, or LTC3833EUDC#PBF equivalent, key selection criteria include valley current mode control architecture, RSENSE/DCR current sensing flexibility, differential VOSNS+/- feedback accuracy, and QFN-20 (3mm × 4mm) thermal performance with exposed SGND pad.
Technical Context
The LTC3833EUDC#PBF implements controlled on-time valley current mode control, where top-gate on-time is fixed per cycle and adjusted via ITH voltage to maintain regulation - delivering fast transient response while sustaining constant frequency under steady-state conditions. Its PLL-based synchronization circuit locks TG edge to external clocks within ±30% of the RT-set frequency.
Differential sensing at VOSNS+/VOSNS− feeds an internal difference amplifier (DA) that rejects common-mode ground offsets up to ±500mV, enabling accurate remote-sense regulation independent of PCB trace IR drop. The error amplifier (gm = 1.7mS typ.) compares this differential signal to a 0.6V reference and drives ITH to modulate valley current threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 38V - supports wide-input industrial and telecom power rails without pre-regulation. |
| VOUT Range | 0.6V to 5.5V - enables core voltage scaling for modern processors and FPGAs. |
| Output Regulation Accuracy | ±0.67% over –40°C to 125°C - ensures stable output under thermal stress in enclosed enclosures. |
| Min. On/Off Time | tON(MIN) = 20ns / tOFF(MIN) = 90ns - permits near 0% and near 100% duty cycles for extreme input-output ratios (e.g., 36V→0.6V). |
| Switching Frequency | 200kHz–2MHz (RT-programmable) - allows EMI optimization and inductor size reduction in space-constrained designs. |
| Current Sensing | RSENSE or DCR options - eliminates need for dedicated sense resistors in high-current applications, reducing power loss. |
| Package | 20-pin QFN (3mm × 4mm) with exposed SGND pad - provides low θJA = 43°C/W for thermally demanding 20A+ loads. |
Pinout & Package
20-lead plastic QFN (3mm × 4mm) with exposed signal ground (SGND) pad (Pin 21), rated for –40°C to 125°C junction temperature. Exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (1) | Open-drain power-good indicator | Asserts low when VOUT deviates >±7.5% from regulated setpoint - enables system-level sequencing and fault reporting. |
| SENSE+ / SENSE− (2,3) | Differential current sense inputs | Accept Kelvin connections across RSENSE or RC filter for DCR sensing - enables accurate valley current measurement independent of PCB layout parasitics. |
| VOSNS+ / VOSNS− (6,5) | Differential output voltage sense inputs | Measure remote output terminals directly - corrects for up to ±500mV IR drop in high-current paths without requiring local sense points. |
| TG / BG (19,17) | Top/bottom N-MOSFET gate drivers | Drive external high-side and low-side switches with 2.5Ω/1.2Ω pull-up/pull-down strength - supports fast switching with minimal dead-time uncertainty. |
| RT (10) | Frequency programming input | 1.2V-biased node accepting external resistor (e.g., 205kΩ → 200kHz) - sets free-running oscillator frequency before PLL lock. |
| MODE/PLLIN (13) | External clock sync & light-load mode select | Accepts external clock (200kHz–2MHz ±30%) or configures forced continuous/pulse-skipping operation - critical for EMI-sensitive or efficiency-optimized systems. |
Key Features
| Feature | Design Value |
|---|---|
| Differential output sensing | Compensates for ±500mV remote ground offset - eliminates output voltage error caused by high-current PCB trace resistance. |
| Valley current mode control | Enables fast load transient response while maintaining constant-frequency operation - avoids subharmonic oscillation in high-VIN/VOUT-ratio converters. |
| Programmable soft-start / tracking | Internal 1µA current source charges external capacitor on TRACK/SS - enables smooth ramp-up or precise voltage sequencing with master supplies. |
| Overvoltage protection (OVP) | Forces BG high during overvoltage events - actively clamps output by shorting inductor to ground, preventing damage to downstream ICs. |
| EXTVCC bypass capability | Switches INTVCC supply from internal LDO to external ≥4.6V source - reduces self-heating and improves efficiency in high-current, low-VIN applications. |
Applications
| Server VRM | Telecom POL Converter |
|---|---|
Use Scenario: 1.5V/20A core supply for dual-socket Xeon server CPUs with tight transient requirements. IC Role / Device Role / Timing Role: Primary step-down controller managing all-N-channel power stage with differential remote sensing across motherboard VRM traces. Use Value: ±0.67% regulation accuracy and 20ns tON(MIN) enable stable core voltage during 10A/µs load steps without droop-induced timing violations. |
Use Scenario: 3.3V/15A intermediate bus converter feeding multiple downstream POL modules in 48V telecom shelf. IC Role / Device Role / Timing Role: High-efficiency buck controller operating at 500kHz with EXTVCC bypassed to 5V auxiliary rail to minimize thermal stress. Use Value: RSENSE/DCR flexibility and forced continuous mode reduce output ripple and EMI, meeting GR-1089 Class B emissions limits. |
| Industrial PLC Power | FPGA Power Management |
Use Scenario: 1.2V/12A supply for Spartan UltraScale+ FPGA in harsh-temperature factory automation controllers. IC Role / Device Role / Timing Role: Temperature-stable controller with –40°C to 125°C rating, using differential sensing to reject noise from motor-drive PCB sections. Use Value: ±500mV line-loss correction maintains 1.2V ±12mV accuracy despite 15cm PCB trace length between VRM and FPGA ball grid. |
Use Scenario: Multi-rail sequencing for Zynq Ultrascale+ MPSoC with 0.85V PS, 1.8V PL, and 3.3V I/O supplies. IC Role / Device Role / Timing Role: Controller configured in tracking mode via resistor divider on TRACK/SS - synchronizes 0.85V ramp with 1.8V master rail. Use Value: Internal 1µA soft-start current enables precise, repeatable sequencing without external timers or microcontroller intervention. |
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 (40V/12A), no differential sensing, fixed 600kHz frequency | Suitable for lower-current, cost-sensitive designs where board space > accuracy | Select when integrated power stage suffices and ±500mV line-loss correction is unnecessary. |
| ISL8113IRZ-T7A | Supports 2-phase PolyPhase® operation, higher VIN max (60V), no EXTVCC bypass | Targeted at multi-phase CPU/GPU VRMs requiring >30A output with interleaved ripple cancellation | Choose for phase-multiplexed high-current designs needing tighter ripple control and higher input voltage tolerance. |
Compared with MP2918GQ-Z and ISL8113IRZ-T7A, the LTC3833EUDC#PBF uniquely combines differential remote sensing, ultra-fast transient response, and EXTVCC bypass in a compact QFN - making it optimal for single-phase, high-accuracy, thermally constrained POL applications where layout-induced ground offsets dominate regulation error.
Availability
LTC3833EUDC#PBF is available at Aetrix Electronics and suitable for distributed power systems, point-of-load converters, and computing systems requiring stable component supply with guaranteed long-term manufacturability and automotive-grade temperature support.
Supply support for LTC3833EUDC#PBF 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 reliability testing and long-term product commitments.
The LTC3833EUDC#PBF belongs to Linear's precision DC/DC controller family, designed specifically for high-efficiency, high-current synchronous buck conversion in space- and thermal-constrained environments like servers, telecom infrastructure, and industrial PLCs.
FAQ
What is the absolute maximum VIN rating for the LTC3833EUDC#PBF?
The LTC3833EUDC#PBF has an absolute maximum VIN rating of 40V. Operation above 38V violates the recommended operating range and risks permanent damage. The device is specified for continuous operation from 4.5V to 38V, with robust internal protection against overvoltage transients up to 40V for short durations as defined in the Absolute Maximum Ratings table.
How does differential output sensing work on the LTC3833EUDC#PBF?
The LTC3833EUDC#PBF uses VOSNS+ and VOSNS− pins to measure the true output voltage at remote load terminals. An internal difference amplifier converts this differential signal into a single-ended input for the error amplifier, which regulates to maintain VOSNS+ − VOSNS− = 0.6V. This compensates for up to ±500mV voltage drop across PCB traces between the regulator and load, ensuring accurate regulation at the point of use.
Can the LTC3833EUDC#PBF operate with only DCR current sensing?
Yes, the LTC3833EUDC#PBF fully supports DCR current sensing via SENSE+ and SENSE− pins connected across an RC filter placed in series with the inductor. The VRNG pin configures the current sense threshold range, and the device automatically adapts to DCR-based sensing without external op-amps or gain stages - reducing component count and improving efficiency in high-current designs.
What is the purpose of the EXTVCC pin on the LTC3833EUDC#PBF?
The EXTVCC pin on the LTC3833EUDC#PBF allows external powering of the INTVCC rail when supplied with ≥4.6V. This bypasses the internal LDO, reducing power dissipation and self-heating - especially beneficial in high-current, low-VIN applications. When EXTVCC falls below 4.4V, the internal LDO seamlessly resumes regulation of INTVCC from VIN.
Does the LTC3833EUDC#PBF support output voltage tracking during startup?
Yes, the LTC3833EUDC#PBF supports output voltage tracking via the TRACK/SS pin. By applying an external voltage ramp (e.g., from another supply through a resistor divider), the controller regulates VOSNS+ − VOSNS− to match the TRACK/SS voltage until it reaches 0.6V - enabling precise sequencing with master rails in multi-rail systems without additional timing circuitry.
LTC3833EUDC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3833EUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3833EUDC#PBF 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#PBF reliable?
The price and inventory of LTC3833EUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3833EUDC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3833EUDC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3833EUDC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3833EUDC#PBF?
LTC3833EUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3833EUDC#PBF 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#PBF?
For technical support, including LTC3833EUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3833EUDC#PBF requirements.
6.How does Aetrix verify that LTC3833EUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3833EUDC#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3833EUDC#PBF?
All LTC3833EUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3833EUDC#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3833EUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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