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Analog Devices Inc. LTC3833EFE#PBF
- Part No.:
- LTC3833EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3833EFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,800
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Product details
Overview
LTC3833EFE#PBF 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#PBF datasheet, LTC3833EFE#PBF pinout, LTC3833EFE#PBF application, or LTC3833EFE#PBF equivalent, this page delivers verified package mapping (20-lead TSSOP), valley current mode architecture details, differential sensing design implications, and validated alternative controllers for high-current buck converter designs.
Technical Context
The LTC3833EFE#PBF 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 RT-set frequency, enabling EMI reduction in noise-sensitive systems.
It supports dual current sensing methods - RSENSE or DCR - with VRNG-programmable sense thresholds (22–120 mV), and integrates safety functions including overvoltage protection (±7.5% PGOOD window), foldback current limiting, and micropower shutdown (15 µA).
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, 1.8 V, 3.3 V) for processors and FPGAs. |
| Output Regulation Accuracy | ±0.67% over temperature - ensures tight voltage tolerance under thermal stress in embedded computing systems. |
| Min On/Off Time | tON(MIN) = 20 ns, tOFF(MIN) = 90 ns - enables near 0% and near 100% duty cycles for ultra-low-VOUT or high-VIN-to-VOUT ratio designs. |
| Switching Frequency | 200 kHz to 2 MHz (RT-programmable) - balances efficiency (low f) vs. size (high f) in space-constrained PCB layouts. |
| Differential Sensing Range | ±500 mV common-mode offset compensation - corrects for IR drop across long PCB traces or connectors in remote-sense POL applications. |
| Gate Driver Strength | TG pull-up: 2.5 Ω, BG pull-down: 0.8 Ω - drives large N-MOSFETs with low dead-time (15–20 ns) to minimize shoot-through risk. |
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 regulated setpoint - enables system-level sequencing and fault reporting. |
| SENSE+ / SENSE– (Pins 2, 3) | Differential current sense inputs | Accept Kelvin connections for RSENSE or DCR sensing - critical for accurate valley current mode control and load-step fidelity. |
| VOSNS+ / VOSNS– (Pins 6, 5) | Differential output voltage sense inputs | Enable remote sensing at load; tolerate ±500 mV ground offset - essential for accurate regulation in distributed power architectures. |
| TRACK/SS (Pin 7) | Soft-start and tracking control input | Internal 1.0 µA current source charges external capacitor - sets monotonic VOUT ramp time or enables master-slave supply tracking. |
| ITH (Pin 8) | Error amplifier output / current threshold control | Voltage (0–2.4 V) sets valley current limit - directly links loop compensation (via CITH1/RITH) to transient response performance. |
| RT (Pin 10) | Frequency programming node | 1.2 V bias with external resistor to SGND - determines free-running fSW; required for PLL lock range definition when synchronizing externally. |
| RUN (Pin 11) | Digital enable/shutdown control | 1.2 V turn-on threshold; <0.75 V enters 15 µA shutdown - supports sequenced power-up and system-level standby modes. |
| MODE/PLLIN (Pin 13) | Sync clock input / forced continuous mode select | Accepts external clock (200 kHz–2 MHz); tie to INTVCC to disable pulse-skipping - maintains constant fSW under light loads. |
| VIN (Pin 14) | Main input supply | 4.5–38 V operation - powers internal LDO (INTVCC) unless EXTVCC >4.6 V bypasses it for higher efficiency. |
| TG / BG (Pins 19, 17) | Top/bottom N-MOSFET gate drivers | Drive external high-side and low-side switches - TG floats relative to SW; BG referenced to PGND. |
Key Features
| Feature | Design Value |
|---|---|
| Differential output voltage sensing | Compensates for up to ±500 mV IR drop between local and remote grounds - eliminates regulation error in multi-layer PCBs with long power paths. |
| Controlled on-time valley current mode | Delivers fast load transient response (<5 µs recovery shown in G02/G03) while maintaining constant frequency - avoids audible noise and simplifies EMI filtering. |
| Programmable current sense range (VRNG) | Selects max VSENSE from 22 mV to 120 mV via VRNG pin voltage - optimizes signal-to-noise ratio for RSENSE or DCR sensing across varying current levels. |
| External VCC bypass (EXTVCC) | Shuts down internal LDO when EXTVCC >4.6 V - reduces self-heating and improves efficiency in high-current designs where VOUT ≥ 4.6 V. |
| Power good monitoring with hysteresis | PGOOD asserts only when VOUT stays within ±7.5% window for >10 µs - prevents false triggers during brief transients and ensures reliable system enable timing. |
Applications
| Server VRM | Telecom Line Card |
|---|---|
|
Use Scenario: 1.5 V/20 A core supply for Xeon or AMD EPYC processors in 1U rack servers. IC Role / Device Role: Primary synchronous buck controller managing all-N-channel MOSFETs with remote sense at CPU socket. Use Value: ±0.67% regulation accuracy and 20 ns tON ensure stable core voltage under rapid 0→20 A load steps, preventing processor reset or throttling. |
Use Scenario: Point-of-load converter on dense line cards handling 48 V backplane input to generate 3.3 V/12 A for FPGA I/O banks. IC Role / Device Role: High-efficiency step-down controller with EXTVCC bypass and forced continuous mode for low-noise digital logic supplies. Use Value: 2 MHz switching capability shrinks inductor size by >50% vs. 500 kHz designs; differential sensing maintains 3.3 V ±10 mV at FPGA pins despite 150 mV board drop. |
| Industrial PLC CPU Board | Network Switch ASIC Supply |
|
Use Scenario: 1.2 V/15 A supply for ARM-based real-time control CPUs operating in –40°C to 85°C ambient. IC Role / Device Role: Temperature-stable buck controller with –40°C to 125°C junction rating and integrated OVP/foldback protection. Use Value: ±0.67% output regulation over full temp range ensures deterministic CPU behavior; PGOOD enables watchdog-triggered fail-safe shutdown. |
Use Scenario: Multi-phase capable single-channel controller powering 0.85 V/30 A ASIC core rail in 10 GbE switch fabric modules. IC Role / Device Role: Valley current mode controller synchronized to system clock to suppress switching noise coupling into high-speed SerDes lanes. Use Value: PLL synchronization to 125 MHz reference eliminates beat frequencies; 90 ns tOFF enables precise phase alignment in PolyPhase implementations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8640S | Integrated 4 A power stage; fixed 2.2 MHz fSW; no differential output sensing; lower VIN min (3.4 V) | Better suited for compact, medium-current (≤4 A) designs where board space > remote sensing accuracy | Choose LT8640S for simplified layout and lower BOM count where ±500 mV line loss correction is unnecessary. |
| MP2918 | 3.3 V–28 V VIN; supports PMBus; no EXTVCC bypass; tON(MIN) = 60 ns (vs. 20 ns) | Targeted at digitally managed power systems requiring telemetry and dynamic voltage scaling | Choose MP2918 when digital interface, telemetry, and AVS are required - but avoid for sub-1 V/20 A designs needing <20 ns tON. |
Compared with LT8640S and MP2918, the LTC3833EFE#PBF uniquely combines differential remote sensing, 20 ns minimum on-time, and EXTVCC bypass - making it optimal for high-current, high-accuracy analog-controlled POL converters where layout-induced voltage drop and thermal derating are critical.
Availability
LTC3833EFE#PBF is available at Aetrix Electronics and suitable for server VRMs, telecom line cards, industrial PLC CPU boards, and network switch ASIC supplies requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for LTC3833EFE#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 power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3833 belongs to Linear's high-current synchronous buck controller product line, designed specifically for demanding point-of-load applications requiring precision regulation, fast transient response, and robust fault protection in computing and communications infrastructure.
FAQ
What is the minimum on-time specification for the LTC3833EFE#PBF, and why does it matter in high-input-voltage applications?
The LTC3833EFE#PBF has a guaranteed minimum on-time (tON(MIN)) of 20 ns at VIN = 38 V and VOUT = 0.6 V. This ultra-short on-time enables stable operation at very low duty cycles - critical for generating sub-1 V outputs from 24 V or 36 V industrial or telecom inputs without requiring cascaded conversion stages. Without this spec, the controller would skip pulses or lose regulation, causing output ripple and instability.
How does differential output sensing in the LTC3833EFE#PBF improve regulation accuracy compared to single-point feedback?
The LTC3833EFE#PBF uses VOSNS+ and VOSNS– pins to measure voltage directly across the load terminals, rejecting up to ±500 mV of ground potential difference between controller and load. In contrast, single-point sensing measures only at the converter output, allowing IR drop in PCB traces or connectors to cause regulation error. This makes the LTC3833EFE#PBF essential for applications like CPU VRMs where 10 mV error at the die can impact timing margins.
Can the LTC3833EFE#PBF operate without an external bootstrap capacitor, and what is the role of the BOOST pin?
No - the LTC3833EFE#PBF requires an external bootstrap capacitor (CB) connected between BOOST and SW pins to drive the high-side N-MOSFET gate above VIN. The BOOST pin supplies the floating gate drive voltage for TG; during each off-cycle, CB recharges through an external Schottky diode from INTVCC. Omitting CB disables high-side switching, halting regulation - this is not a self-bootstrapping IC.
What is the function of the VRNG pin on the LTC3833EFE#PBF, and how does it affect current sensing accuracy?
The VRNG pin on the LTC3833EFE#PBF sets the full-scale range of the valley current sense amplifier: VSENSE(MAX) = 0.05 × VRNG. With VRNG tied to SGND (0 V), max sense voltage is 30 mV; tied to INTVCC (~5.3 V), it becomes 50 mV. This scaling allows optimization of signal-to-noise ratio for different sense resistor values or DCR networks - improving current limit accuracy across load conditions without changing hardware.
Does the LTC3833EFE#PBF support both pulse-skipping and forced continuous conduction modes, and how is mode selection implemented?
Yes - the LTC3833EFE#PBF supports both modes via the MODE/PLLIN pin. Tying MODE/PLLIN to SGND enables pulse-skipping (discontinuous) mode at light loads, improving efficiency. Connecting it to INTVCC or applying an external clock forces continuous conduction mode - maintaining constant switching frequency and predictable EMI profile, essential for noise-sensitive analog or RF subsystems powered from the same rail.
LTC3833EFE#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
LTC3833EFE#PBF FAQ
1.How can I place an order for LTC3833EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3833EFE#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 LTC3833EFE#PBF reliable?
The price and inventory of LTC3833EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3833EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3833EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3833EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3833EFE#PBF?
LTC3833EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3833EFE#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 LTC3833EFE#PBF?
For technical support, including LTC3833EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3833EFE#PBF requirements.
6.How does Aetrix verify that LTC3833EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3833EFE#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 LTC3833EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3833EFE#PBF?
All LTC3833EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3833EFE#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 LTC3833EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3833EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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