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Analog Devices Inc. LTC3833IFE#PBF
- Part No.:
- LTC3833IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3833IFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,287
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Product details
Overview
LTC3833IFE#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-down DC/DC controller for high-power point-of-load applications, driving all-N-channel MOSFETs with controlled on-time valley current mode control. 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 datacomm systems.
For engineers reviewing the LTC3833IFE#PBF datasheet, LTC3833IFE#PBF pinout, LTC3833IFE#PBF application, or LTC3833IFE#PBF 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 output.
Technical Context
The LTC3833IFE#PBF implements valley current mode control using a precision error amplifier (gm = 1.7 mS) and internal 0.6V reference to regulate VOSNS+ − VOSNS−. Its controlled on-time architecture ensures constant-frequency operation independent of VIN, VOUT, and load, while supporting both pulse-skipping and forced continuous modes via MODE/PLLIN pin configuration.
Differential output sensing corrects for up to ±500mV ground offset between local and remote output terminals, enabling accurate regulation in distributed power systems. Current sensing is configurable via RSENSE or DCR methods, with VRNG pin selecting sense voltage range (30mV to 61mV max), and ITH pin providing direct control of valley current threshold from 0V to 2.4V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V - supports wide industrial and telecom input rails without external pre-regulation. |
| Output Voltage Accuracy | ±0.67% over temperature - ensures stable core voltage delivery under thermal stress in CPU/GPU power stages. |
| Min On-/Off-Time | tON(MIN) = 20ns, tOFF(MIN) = 90ns - enables near 0% and near 100% duty cycles for ultra-low-VOUT or high-input-ratio designs. |
| Switching Frequency | 200kHz to 2MHz (resistor-programmable) - allows EMI optimization and inductor size reduction in space-constrained boards. |
| Differential Sensing Range | ±500mV common-mode offset tolerance - compensates PCB trace IR drop for precise remote load regulation. |
| Gate Driver Strength | TG pull-up: 2.5Ω, BG pull-down: 0.8Ω - drives large N-MOSFETs with low dead-time (15–20ns) to minimize shoot-through risk. |
| Power Good Threshold | ±7.5% window around regulated VOUT - provides reliable system enable signaling with hysteresis for noise immunity. |
Pinout & Package
20-lead plastic TSSOP package (FE variant), exposed pad (Pin 21) connected to SGND for thermal and electrical integrity. Pin count and layout match industry-standard TSSOP-20 footprint with 0.65mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (Pin 1) | Open-drain power-good indicator | Asserts low when VOUT deviates >±7.5% from target - used for sequenced power-up in multi-rail systems. |
| SENSE+ / SENSE− (Pins 2,3) | Differential current sense inputs | Accept Kelvin connections across sense resistor or DCR filter - enables accurate valley current detection independent of ground bounce. |
| VOSNS+ / VOSNS− (Pins 6,5) | Differential output voltage sense inputs | Measure remote feedback across output capacitor - corrects for up to ±500mV PCB trace voltage drop at load. |
| ITH (Pin 8) | Error amplifier output / current threshold control | 0–2.4V analog interface sets valley current limit - used for loop compensation and current foldback programming. |
| RUN (Pin 11) | Digital enable/disable control | 1.2V threshold with 70mV hysteresis - supports hardware sequencing and microcontroller-controlled soft-start initiation. |
| MODE/PLLIN (Pin 13) | Mode select / external clock sync input | Configures pulse-skipping vs forced continuous mode; accepts external clock within ±30% of programmed fSW for EMI reduction. |
| RT (Pin 10) | Frequency programming node | 1.2V-biased input - sets fSW from 200kHz to 2MHz with single resistor; enables deterministic timing for system-level synchronization. |
| TG / BG (Pins 19,17) | Top/bottom N-MOSFET gate drivers | High-current drivers with matched dead-time control - eliminates need for external gate driver ICs in high-efficiency buck designs. |
Key Features
| Feature | Design Value |
|---|---|
| Differential output voltage sensing | Compensates for up to ±500mV ground potential difference between controller and load - critical for accurate regulation in server VRMs. |
| Controlled on-time valley current mode | Delivers fast load transient response while maintaining constant switching frequency - avoids audible noise and simplifies EMI filtering. |
| Programmable current limit with foldback | VRNG-selectable sense voltage range (30–61mV) + foldback during overload - protects MOSFETs and inductors during short-circuit events. |
| External VCC switchover | Auto-switches from internal LDO to EXTVCC ≥4.6V - reduces self-heating and improves efficiency in high-current applications. |
| Tracking/soft-start with internal 1µA current source | Enables monotonic ramp-up of VOUT via external capacitor or tracking to master supply - prevents inrush current and rail collapse. |
Applications
| Server CPU Core Power | Telecom Point-of-Load |
|---|---|
|
Use Scenario: Regulating 1.5V/20A for high-performance x86 processor cores with tight voltage tolerance and rapid load transients. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing top/bottom N-MOSFETs, differential remote sensing, and PGOOD sequencing. Use Value: ±0.67% regulation accuracy and 20ns min on-time ensure stable core voltage under dynamic workloads; differential sensing maintains accuracy despite PCB plane resistance. |
Use Scenario: Generating 3.3V/12A for FPGA I/O banks in 48V intermediate bus telecom systems with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency step-down controller synchronized to system clock via MODE/PLLIN pin to suppress conducted emissions. Use Value: 200kHz–2MHz programmable frequency and external clock sync enable EMI compliance; forced continuous mode eliminates subharmonic noise. |
| Industrial PLC Power | Networking ASIC Supply |
|
Use Scenario: Providing 0.85V/15A to industrial programmable logic controller (PLC) processors operating in extended temperature environments (−40°C to 125°C). IC Role / Device Role / Timing Role: Robust DC/DC controller with overvoltage protection, current foldback, and thermal shutdown for mission-critical embedded systems. Use Value: Guaranteed −40°C to 125°C operation and ±0.67% regulation over temperature ensure reliability in uncontrolled ambient conditions. |
Use Scenario: Delivering 1.2V/18A to high-speed networking ASICs requiring precise voltage tracking during hot-swap insertion. IC Role / Device Role / Timing Role: Dual-function controller supporting output voltage tracking via TRACK/SS pin and seamless soft-start into pre-biased outputs. Use Value: Internal 1µA soft-start current and TRACK/SS interface enable controlled ramp-up matching upstream supplies - prevents backfeeding and latch-up. |
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), fixed 500kHz fSW, no differential sensing | Suitable for lower-current, cost-sensitive designs where board space is constrained but remote sensing not required | Choose MP2918GQ-Z only if integrated power stage suffices and ±500mV line loss compensation is unnecessary. |
| ISL8113IRZ-T7A | Supports dual-phase operation, higher 60V VIN, no EXTVCC switchover, different pinout | Better suited for high-input-voltage, multiphase CPU VRMs requiring phase interleaving and higher fault robustness | Select ISL8113IRZ-T7A when designing >30A multi-phase solutions with 24–60V input and need for current sharing. |
Compared with MP2918GQ-Z and ISL8113IRZ-T7A, the LTC3833IFE#PBF uniquely combines differential remote sensing, 20ns min on-time, and EXTVCC switchover in a TSSOP-20 package - making it optimal for high-accuracy, high-current single-phase POL converters where layout-induced ground offsets must be rejected.
Availability
LTC3833IFE#PBF is available at Aetrix Electronics and suitable for server CPU core power, telecom point-of-load conversion, and industrial PLC power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3833IFE#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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC3833 series.
The LTC3833 belongs to Linear's high-performance DC/DC controller family designed specifically for demanding point-of-load applications in computing, datacom, and industrial systems requiring precision regulation and fast transient response.
FAQ
What is the maximum input voltage rating for the LTC3833IFE#PBF?
The LTC3833IFE#PBF has an absolute maximum VIN rating of 40V, with recommended operating range from 4.5V to 38V. Exceeding 40V may cause permanent damage. The device includes internal protection against overvoltage on BOOST (to 46V) and SW (to 40V), but sustained operation above 38V requires careful thermal design and derating per the datasheet's θJA = 38°C/W specification for the TSSOP package.
Does the LTC3833IFE#PBF support remote differential output voltage sensing?
Yes, the LTC3833IFE#PBF supports true differential output voltage sensing via dedicated VOSNS+ (Pin 6) and VOSNS− (Pin 5) pins. This allows correction for up to ±500mV ground potential difference between the controller's local ground and the remote load ground - a key feature confirmed in the datasheet's "Differential Output Sensing" section and validated by its ±0.67% output regulation spec over temperature and line/load variations.
How does the RUN pin function on the LTC3833IFE#PBF?
The RUN pin (Pin 11) on the LTC3833IFE#PBF provides three operational states: below 0.75V enables micropower shutdown (IQ ≈ 15µA), between 0.75V–1.2V activates standby mode (IQ ≈ 2mA) with drivers disabled, and above 1.2V fully enables switching. An internal 1.3µA pull-up current allows simple RC-based soft-start control, and the pin tolerates up to 6V - verified in Absolute Maximum Ratings and Functional Diagram sections of the datasheet.
Can the LTC3833IFE#PBF synchronize to an external clock?
Yes, the LTC3833IFE#PBF can synchronize switching to an external clock applied to the MODE/PLLIN pin (Pin 13). The PLL system locks to external clocks within ±30% of the free-running frequency set by the RT resistor. This capability is explicitly documented in the "Frequency Selection and External Clock Synchronization" section and enables deterministic EMI reduction in noise-sensitive systems like medical or test equipment.
What is the purpose of the VRNG pin on the LTC3833IFE#PBF?
The VRNG pin (Pin 9) on the LTC3833IFE#PBF selects the maximum allowable current sense voltage (VSENSE) range: 30mV when tied to SGND, 50mV when tied to INTVCC, or 100mV when tied to 2V. This directly scales the valley current threshold and is essential for optimizing signal-to-noise ratio across different sense resistor or DCR values - confirmed by Electrical Characteristics table entries for VSENSE(MAX) and VSENSE(MIN) under varying VRNG conditions.
LTC3833IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LTC3833IFE#PBF FAQ
1.How can I place an order for LTC3833IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3833IFE#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 LTC3833IFE#PBF reliable?
The price and inventory of LTC3833IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3833IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3833IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3833IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3833IFE#PBF?
LTC3833IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3833IFE#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 LTC3833IFE#PBF?
For technical support, including LTC3833IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3833IFE#PBF requirements.
6.How does Aetrix verify that LTC3833IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3833IFE#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 LTC3833IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3833IFE#PBF?
All LTC3833IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3833IFE#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 LTC3833IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3833IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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