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Analog Devices Inc. LTC3839EUH#PBF
- Part No.:
- LTC3839EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3839EUH#PBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:224
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Product details
Overview
LTC3839EUH#PBF from Analog Devices (formerly Linear Technology) is a 2-phase, single-output synchronous step-down DC/DC controller driving all-N-channel MOSFETs. It delivers ±0.67% output voltage accuracy via differential sensing, supports 0.6V–5.5V output at up to 25A with 2MHz switching, and features load-release transient detection for overshoot suppression in point-of-load systems.
For engineers reviewing the LTC3839EUH#PBF datasheet, LTC3839EUH#PBF pinout, LTC3839EUH#PBF application, or LTC3839EUH#PBF equivalent, key selection criteria include its controlled on-time valley current mode architecture, 30ns minimum on-time, differential remote sensing tolerance of ±500mV ground offset, and programmable 200kHz–2MHz frequency with external clock synchronization.
Technical Context
The LTC3839EUH#PBF implements a controlled on-time, valley current mode control architecture that ensures constant-frequency operation independent of input voltage, output voltage, and load current-enabling fast transient response without loop compensation complexity. Its dual-phase interleaved operation reduces input/output ripple and enables scalable high-current designs up to 12-phase with master/slave configuration.
Differential output sensing (VOUTSENSE+ and VOUTSENSE–) references the remote load ground, allowing accurate regulation even with ±500mV common-mode offset between local and remote grounds. The DTR (Detect Transient Release) function actively monitors load release events and disables bottom gate drivers to minimize output overshoot during rapid current reduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V - supports wide industrial and telecom input rails including 5V, 12V, 24V, and 36V systems. |
| Output Voltage Range | 0.6V to 5.5V - configurable for core logic, memory, FPGA, and ASIC supplies with precision tracking. |
| Output Voltage Accuracy | ±0.67% over temperature - achieved via differential sensing and internal 0.6V reference, enabling tight regulation under line/load/common-mode variation. |
| Switching Frequency | 200kHz to 2MHz - set by RT resistor or synchronized to external clock; higher frequencies enable smaller magnetics and faster transient response. |
| tON(MIN) | 30ns - allows near-0% duty cycle for high VIN-to-low VOUT conversion (e.g., 38V→0.6V), critical for wide-input applications. |
| tOFF(MIN) | 90ns - enables near-100% duty cycle for low-dropout operation, improving efficiency at light loads and high duty cycles. |
| Current Sensing | RSENSE or DCR - supports both discrete shunt and inductor-based sensing with VRNG-programmable threshold (30mV–100mV range). |
| Thermal Package | 32-pin 5mm × 5mm QFN with exposed PGND pad - θJA = 44°C/W; requires soldered thermal pad for rated 125°C junction operation. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed power ground pad (Pin 33), rated for –40°C to 125°C junction temperature. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PHASMD (1) | Phase configuration selector | Sets relative phase between channels (180° or 240°) and CLKOUT phase (60°, 90°, or 120°); determines interleaving alignment for ripple cancellation. |
| MODE/PLLIN (2) | Mode control or sync input | Selects forced continuous/discontinuous mode or accepts external clock (±30% lock range) for system-wide timing coordination. |
| VOUTSENSE+ (8), VOUTSENSE– (9) | Differential output voltage sense inputs | Enable remote sensing across PCB traces; tolerate ±500mV ground offset between local IC ground and remote load ground. |
| SENSE1+/SENSE2+ (10,31), SENSE1–/SENSE2– (11,30) | Differential current sense inputs | Support Kelvin RSENSE or DCR sensing; SENSE– pins include internal 500kΩ to SGND for biasing in DCR configurations. |
| DTR (12) | Load-release transient detector | Triggers bottom gate disable when load drops rapidly, reducing output overshoot by accelerating inductor current decay. |
| TG1/TG2 (15,26), BG1/BG2 (17,24) | Top/bottom gate drivers | Drive N-channel MOSFETs with 2.5Ω pull-up / 1.2Ω pull-down strength; support bootstrap operation via BOOST1/BOOST2 pins. |
| RUN (28) | Enable/disable control | PTAT pull-up (~2.5µA); turns on at ~1.2V, shuts down bias at <0.8V; supports sequencing and UVLO-independent control. |
| PGOOD (13) | Power-good open-drain output | Asserts low when VOUT deviates >±7.5% from regulation point, with 50µs fault delay and 20µs recovery delay plus 2% hysteresis. |
Key Features
| Feature | Design Value |
|---|---|
| Controlled on-time valley current mode | Delivers constant-frequency operation independent of VIN/VOUT/load, eliminating need for complex loop compensation while maintaining fast transient response. |
| Differential output voltage sensing | Enables ±0.67% regulation accuracy despite ±500mV ground potential difference between controller and load, critical for high-current PCB layouts. |
| Load-release transient detection (DTR) | Reduces output overshoot during sudden load removal by disabling bottom gate drivers, verified in 0A→30A and 30A→0A transients at 1.2V/12V input. |
| Programmable current sense range (VRNG) | Adjusts maximum sense voltage from 30mV to 100mV via 0.6V–2V VRNG input, optimizing signal-to-noise ratio for RSENSE or DCR sensing across load ranges. |
| 2-phase interleaved operation | Cuts input/output ripple current by ~70% vs single-phase, lowers EMI, and enables scalable high-current designs using multiple LTC3839 controllers. |
| Ultra-fast min on/off times (30ns/90ns) | Supports high VIN-to-low VOUT conversion (e.g., 38V→0.6V) and high-duty-cycle operation (e.g., 5V→4.5V), extending usable input/output range. |
Applications
| Server CPU Core Supply | FPGA I/O Bank Regulator |
|---|---|
Use Scenario: Providing tightly regulated 0.8V–1.2V at up to 25A to high-performance server CPUs with dynamic load steps exceeding 20A/µs. IC Role / Device Role / Timing Role: 2-phase synchronous buck controller managing dual N-channel MOSFET stages with differential remote sensing at the CPU socket. Use Value: ±0.67% output accuracy and DTR-enabled overshoot suppression prevent CPU reset during rapid load release, while 2MHz operation minimizes output capacitance. | Use Scenario: Powering multiple FPGA I/O banks requiring independent 1.2V, 1.8V, or 2.5V rails with precise tracking and soft-start sequencing. IC Role / Device Role / Timing Role: Single-output controller implementing voltage tracking via TRACK/SS pin to match reference supply ramp rate during power-up. Use Value: Adjustable soft-start and output voltage tracking ensure safe, glitch-free FPGA configuration and eliminate I/O contention during power sequencing. |
| Telecom Line Card POL | Industrial PLC Power Module |
Use Scenario: Generating 3.3V/25A from 48V intermediate bus in space-constrained telecom line cards with strict EMI limits. IC Role / Device Role / Timing Role: Interleaved 2-phase controller operating at 1MHz to reduce input ripple and simplify EMI filtering; synchronized to system clock via MODE/PLLIN. Use Value: 32-pin QFN package and 2MHz capability allow compact layout; differential sensing maintains regulation despite long, noisy PCB traces to remote loads. | Use Scenario: Delivering robust 5V/15A to industrial PLC backplanes with wide input (24V–36V) and high reliability requirements across –40°C to 85°C ambient. IC Role / Device Role / Timing Role: High-voltage buck controller with overvoltage protection, current limit foldback, and thermal shutdown integrated into isolated power stage. Use Value: 38V absolute max input rating and –40°C to 125°C guaranteed operation ensure uptime in harsh environments; PGOOD output enables system-level fault reporting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3838IUH#PBF | Dual-output capable; Channel 2 has ±1% regulation (vs ±0.67% on both channels for LTC3839); separate per-channel current sense range controls. | Preferred when dual independent outputs are required; less suitable for single-output high-accuracy POL where LTC3839's tighter spec matters. | Select LTC3839EUH#PBF for single-output systems demanding highest output accuracy and DTR-enhanced transient immunity. |
| MP2918GL-Z | Monolithic 2-phase controller (integrated MOSFETs); lower VIN range (4.5V–16V); no differential sensing; fixed 0.6V reference only. | Targeted at cost-sensitive, space-constrained consumer applications; lacks remote sensing and wide-VIN capability of LTC3839EUH#PBF. | Choose LTC3839EUH#PBF when design requires >16V input, differential remote sensing, or programmable current sense range. |
Compared with LTC3838IUH#PBF and MP2918GL-Z, the LTC3839EUH#PBF provides superior single-output accuracy (±0.67%), dedicated load-release transient mitigation, and full 4.5V–38V input support-making it optimal for high-reliability, wide-input, remote-sensed POL applications where regulation precision and transient robustness are critical.
Availability
LTC3839EUH#PBF is available at Aetrix Electronics and suitable for distributed power systems, point-of-load converters, and computing systems requiring stable component supply, extended temperature operation, and long-term industrial lifecycle support.
Supply support for LTC3839EUH#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 the LTC portfolio.
The LTC3839EUH#PBF belongs to Linear's high-performance PolyPhase® controller family, designed specifically for high-current, high-efficiency, multi-phase DC/DC conversion in computing, telecom, and industrial infrastructure where accuracy, transient response, and layout flexibility are essential.
FAQ
What is the minimum on-time specification for the LTC3839EUH#PBF and why does it matter?
The LTC3839EUH#PBF has a guaranteed minimum on-time (tON(MIN)) of 30ns. This enables high step-down ratios-such as converting 38V input to 0.6V output-at practical duty cycles without pulse-skipping or instability. In the LTC3839EUH#PBF, this parameter directly supports wide-input applications like telecom and industrial systems where input voltage varies significantly, ensuring reliable regulation even at extreme VIN/VOUT ratios.
How does differential output sensing work in the LTC3839EUH#PBF and what benefit does it provide?
The LTC3839EUH#PBF uses dedicated VOUTSENSE+ and VOUTSENSE– pins to measure voltage directly across the output capacitor terminals at the load, rejecting IR drop in PCB traces. This allows accurate ±0.67% regulation even if the remote ground deviates from the controller's SGND by up to ±500mV-critical for high-current POL designs where trace resistance would otherwise cause significant output error in standard single-point sensing.
Can the LTC3839EUH#PBF synchronize to an external clock, and how is this configured?
Yes, the LTC3839EUH#PBF can synchronize to an external clock applied to the MODE/PLLIN pin (Pin 2). The external clock must fall within ±30% of the frequency set by the RT resistor to achieve lock. Once synchronized, both phases and the CLKOUT signal align to the external source, enabling deterministic timing across multiple converters in a system-essential for EMI reduction and coordinated power sequencing in the LTC3839EUH#PBF-based designs.
What is the purpose of the DTR pin on the LTC3839EUH#PBF and how is it used?
The DTR (Detect Transient Release) pin (Pin 12) on the LTC3839EUH#PBF detects rapid load-current reduction and triggers bottom gate driver disable to accelerate inductor current decay, thereby minimizing output voltage overshoot. An internal 5µA current source pulls DTR toward INTVCC; tying DTR to INTVCC disables the feature. Verified in test circuits, DTR reduces overshoot by >40% during 30A→0A transients-making it vital for CPU and FPGA supplies in the LTC3839EUH#PBF application space.
Does the LTC3839EUH#PBF support both RSENSE and inductor DCR current sensing, and how is sensing range adjusted?
Yes, the LTC3839EUH#PBF supports both RSENSE (Kelvin-connected shunt) and inductor DCR sensing via its differential SENSE+ and SENSE– inputs. The VRNG pin (Pin 32) sets the maximum sense voltage: 0.6V–2V input yields 30mV–100mV full-scale range (20× scaling). For example, 1V on VRNG configures 50mV max sense voltage-optimizing SNR for low-resistance DCR networks or precision shunts in the LTC3839EUH#PBF design.
LTC3839EUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- 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, Phase Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3839EUH#PBF FAQ
1.How can I place an order for LTC3839EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3839EUH#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 LTC3839EUH#PBF reliable?
The price and inventory of LTC3839EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3839EUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3839EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3839EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3839EUH#PBF?
LTC3839EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3839EUH#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 LTC3839EUH#PBF?
For technical support, including LTC3839EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3839EUH#PBF requirements.
6.How does Aetrix verify that LTC3839EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3839EUH#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 LTC3839EUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC3839EUH#PBF?
All LTC3839EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3839EUH#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 LTC3839EUH#PBF part is unused and in its original packaging.
Return procedure for LTC3839EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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