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Analog Devices Inc. LTC3833IUDC#PBF
- Part No.:
- LTC3833IUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3833IUDC#PBF.pdf
- Description:
- IC REG CTRLR BUCK 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:410
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Product details
Overview
LTC3833IUDC#PBF 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 LTC3833IUDC#PBF datasheet, LTC3833IUDC#PBF pinout, LTC3833IUDC#PBF application, or LTC3833IUDC#PBF equivalent, key selection considerations 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 LTC3833IUDC#PBF implements valley current mode control using a precision error amplifier (1.7mS 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-short on-time (20ns) for wide duty-cycle range operation.
It supports dual current-sensing methods-RSENSE or DCR-with programmable sense voltage range (22–120mV) via VRNG pin, and integrates synchronized gate drivers (TG/BG) with matched 15ns/20ns dead-time control. The device operates across –40°C to 125°C and features external clock synchronization, soft-start/tracking, and EXTVCC bypass capability for improved efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V - supports wide industrial and telecom input 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 load voltage despite PCB trace resistance and thermal drift |
| Min On-Time / Off-Time | 20ns / 90ns - allows high VIN-to-VOUT conversion ratios (e.g., 36V→1.2V) at 2MHz |
| Switching Frequency Range | 200kHz to 2MHz - selectable via RT resistor or synchronizable to external clock for EMI reduction |
| Differential Sensing Range | ±500mV line loss correction - compensates for IR drop between converter and remote load point |
| Gate Driver Strength | TG pull-up: 2.5Ω, BG pull-down: 0.8Ω - drives large N-MOSFETs with low propagation delay and shoot-through immunity |
Pinout & Package
20-pin (3mm × 4mm) plastic QFN package with exposed SGND pad (Pin 21) requiring PCB soldering for thermal and electrical performance. θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 14) | Main supply input | Accepts 4.5V–38V; powers internal LDO and supplies gate driver bias when EXTVCC inactive |
| TG (Pin 19) | Top gate drive output | Drives high-side N-MOSFET gate between SW and BOOST; supports bootstrap operation |
| BG (Pin 17) | Bottom gate drive output | Drives low-side N-MOSFET gate between INTVCC and PGND; 0.8Ω pull-down strength |
| SENSE+ / SENSE− (Pins 2/3) | Current sense inputs | Kelvin-connected for RSENSE or DCR sensing; common-mode range: –0.5V to 5.5V |
| VOSNS+ / VOSNS− (Pins 6/5) | Differential output sensing | Enables remote feedback with ±500mV ground offset tolerance; regulates VOSNS+ − VOSNS− = 0.6V |
| TRACK/SS (Pin 7) | Soft-start & tracking input | Internal 1.0µA current source ramps capacitor; output tracks this voltage until reaching 0.6V reference |
| ITH (Pin 8) | Error amplifier output | 0–2.4V control voltage sets valley current threshold; used for loop compensation (RITH/CITH1) |
| RT (Pin 10) | Frequency programming | 1.2V reference node; resistor to SGND sets free-running frequency (200kHz–2MHz) |
| MODE/PLLIN (Pin 13) | Sync & light-load mode control | Accepts external clock (200kHz–2MHz ±30%) or selects forced continuous/pulse-skipping mode |
| PGOOD (Pin 1) | Power-good indicator | Open-drain output asserts low when VOUT deviates >±7.5% from regulation point |
Key Features
| Feature | Design Value |
|---|---|
| Differential output voltage sensing | Compensates up to ±500mV remote ground offset, enabling accurate regulation at point-of-load |
| Controlled on-time valley current mode | Delivers fast load transient response while maintaining constant-frequency operation independent of VIN/VOUT/load |
| Programmable minimum on/off times | 20ns tON(MIN) and 90ns tOFF(MIN) support high-frequency, high-ratio buck conversion without pulse skipping |
| RSENSE or DCR current sensing | Flexible current measurement: discrete shunt or lossless inductor DCR sensing with RC filter interface |
| Integrated safety functions | Overvoltage protection (OVP), programmable current limit with foldback, and PGOOD fault monitoring |
| External VCC bypass capability | EXTVCC ≥4.6V disables internal LDO and powers INTVCC directly, reducing self-heating and improving efficiency |
Applications
| Server VRMs | Industrial PLC Power Supplies |
|---|---|
Use Scenario: Regulating 1.2V/20A CPU core voltage from 12V intermediate bus in rack-mounted servers. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing all-N-channel MOSFETs with differential remote sensing at processor socket. Use Value: ±0.67% regulation accuracy and 20ns min-on-time enable stable core voltage delivery despite PCB plane resistance and thermal gradients. |
Use Scenario: Generating 3.3V/10A I/O rail from 24V factory automation bus with long cable runs. IC Role / Device Role / Timing Role: High-reliability step-down controller with remote sensing and overvoltage protection for DIN-rail mounted controllers. Use Value: ±500mV differential sensing compensates for voltage drop across 2m cables, ensuring precise 3.3V at field I/O modules. |
| Telecom Line Cards | High-Density Point-of-Load Converters |
Use Scenario: Converting –48V telecom supply to +5V/8A for FPGA and SerDes power in optical line cards. IC Role / Device Role / Timing Role: Controller in front-end buck stage feeding downstream POL modules; synchronized to system clock to suppress EMI. Use Value: External clock sync (via MODE/PLLIN) eliminates beat frequencies in dense card stacks, meeting EN55022 Class B limits. |
Use Scenario: Compact 1.8V/15A supply on GPU acceleration module with tight board space constraints. IC Role / Device Role / Timing Role: High-efficiency, high-frequency controller in 3mm×4mm QFN package minimizing footprint and thermal resistance. Use Value: 2MHz operation allows use of 0.47µH inductors and 10× smaller output capacitance versus 500kHz designs. |
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 | Supports only RSENSE sensing; no DCR option; fixed 600kHz–1.2MHz frequency range; lacks differential output sensing | Best suited for cost-sensitive, medium-accuracy applications where remote sensing is unnecessary | Select MP2918GQ-Z only if remote sensing and DCR compatibility are not required and board layout favors smaller QFN-16 package |
| ISL8113IRZ-T7A | Includes integrated MOSFET drivers but no EXTVCC bypass; supports only pulse-skipping at light load (no forced continuous mode) | Ideal for space-constrained designs needing integrated drivers, but unsuitable for noise-sensitive forced-CM applications | Choose ISL8113IRZ-T7A when gate driver integration reduces BOM count and EMI filtering is handled externally |
Compared with MP2918GQ-Z and ISL8113IRZ-T7A, the LTC3833IUDC#PBF uniquely combines differential remote sensing, DCR/RSENSE flexibility, forced continuous mode, and EXTVCC bypass-making it optimal for high-accuracy, high-density, and EMI-critical point-of-load designs.
Availability
LTC3833IUDC#PBF is available at Aetrix Electronics and suitable for server VRMs, industrial PLC power supplies, and telecom line cards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3833IUDC#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and computing markets.
The LTC3833IUDC#PBF belongs to Linear's high-current synchronous buck controller product line, designed specifically for precision point-of-load regulation in computing, telecom, and industrial systems demanding wide input range, fast transient response, and robust fault protection.
FAQ
What is the operating temperature range for the LTC3833IUDC#PBF?
The LTC3833IUDC#PBF is specified for operation from –40°C to 125°C junction temperature and is guaranteed over this full range. Its 20-pin QFN package (3mm × 4mm) features an exposed SGND pad that must be soldered to the PCB for thermal performance and electrical integrity. This rating makes the LTC3833IUDC#PBF suitable for harsh industrial and telecom environments where ambient temperatures exceed 85°C.
How does differential output sensing work on the LTC3833IUDC#PBF?
The LTC3833IUDC#PBF uses dedicated VOSNS+ and VOSNS− pins to measure the true output voltage at the load, rejecting ground potential differences up to ±500mV between local controller ground and remote load ground. Internally, it regulates the differential voltage (VOSNS+ − VOSNS−) to 0.6V via a precision error amplifier. This allows accurate regulation even with significant PCB trace resistance or cable voltage drop, which is critical in distributed power architectures.
Can the LTC3833IUDC#PBF synchronize to an external clock, and what are the requirements?
Yes, the LTC3833IUDC#PBF can synchronize its switching to an external clock applied to the MODE/PLLIN pin. The external clock frequency must be within ±30% of the free-running frequency set by the RT resistor. For example, if RT configures 500kHz, the acceptable sync range is 350kHz–650kHz. Synchronization eliminates beat frequencies in multi-phase or densely packed systems and is essential for meeting strict EMI standards like CISPR 32.
What current sensing methods does the LTC3833IUDC#PBF support, and how is the range selected?
The LTC3833IUDC#PBF supports both discrete RSENSE and lossless inductor DCR current sensing via SENSE+ and SENSE− pins. The maximum sense voltage (22–120mV) is selected using the VRNG pin: tying VRNG to SGND yields 30mV full-scale, to INTVCC yields 50mV, and to 2V yields 100mV. This programmability allows optimization for accuracy (low RSENSE) or efficiency (high DCR), and the differential input rejects common-mode noise in noisy power stages.
Does the LTC3833IUDC#PBF support soft-start and output voltage tracking, and how are they implemented?
Yes, the LTC3833IUDC#PBF implements both via the TRACK/SS pin. An internal 1.0µA current source charges an external capacitor to generate a linear ramp, enabling adjustable soft-start. For tracking, an external voltage (e.g., from a master supply) is applied through a resistor divider to TRACK/SS, causing the LTC3833IUDC#PBF output to follow that reference during startup. This prevents sequencing violations in multi-rail systems such as FPGAs or ASICs with strict power-up order requirements.
LTC3833IUDC#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)
LTC3833IUDC#PBF FAQ
1.How can I place an order for LTC3833IUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3833IUDC#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 LTC3833IUDC#PBF reliable?
The price and inventory of LTC3833IUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3833IUDC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3833IUDC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3833IUDC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3833IUDC#PBF?
LTC3833IUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3833IUDC#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 LTC3833IUDC#PBF?
For technical support, including LTC3833IUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3833IUDC#PBF requirements.
6.How does Aetrix verify that LTC3833IUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3833IUDC#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 LTC3833IUDC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3833IUDC#PBF?
All LTC3833IUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3833IUDC#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 LTC3833IUDC#PBF part is unused and in its original packaging.
Return procedure for LTC3833IUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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