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Analog Devices Inc. LTC3839EUH#TRPBF
- Part No.:
- LTC3839EUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3839EUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,460
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Product details
Overview
LTC3839EUH#TRPBF 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 over temperature with differential sensing, supports 4.5V–38V input and 0.6V–5.5V output, and operates up to 2MHz switching frequency - ideal for high-current point-of-load converters in computing and datacom systems.
For engineers reviewing the LTC3839EUH#TRPBF datasheet, LTC3839EUH#TRPBF pinout, LTC3839EUH#TRPBF application, or LTC3839EUH#TRPBF equivalent, key selection criteria include its valley current mode control architecture, 30ns minimum on-time, load-release transient detection (DTR), differential remote sensing capability (±500mV ground offset tolerance), and thermally enhanced 5mm × 5mm QFN package with exposed PGND pad.
Technical Context
The LTC3839EUH#TRPBF implements controlled on-time, valley current mode control with dual-phase interleaving - enabling fast transient response while maintaining constant-frequency operation independent of VIN, VOUT, and load. Its DTR circuit monitors the DTR pin voltage relative to 0.5×INTVCC to detect rapid load release and force BG turn-off, minimizing overshoot at low-VOUT conditions.
Differential output sensing (VOUTSENSE+ and VOUTSENSE–) feeds into a precision error amplifier referenced to 0.6V, achieving ±0.67% regulation across line, load, and common-mode variations. Current sensing supports both RSENSE and inductor DCR methods, with VRNG-programmable sense range (30mV to 100mV) and internal 500kΩ pull-down on SENSE– pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V - enables direct integration into wide-input industrial and telecom power rails without pre-regulation. |
| Output Voltage Range | 0.6V to 5.5V - supports core voltages for modern CPUs, FPGAs, and ASICs with precise differential feedback. |
| Output Voltage Accuracy | ±0.67% over temperature - achieved via differential sensing and precision 0.6V internal reference, tolerating ±500mV remote ground deviation. |
| Switching Frequency | 200kHz to 2MHz - programmable via RT resistor or synchronizable to external clock, allowing EMI optimization and size reduction. |
| Min. Top-Gate On-Time | 30ns - enables high VIN-to-low VOUT conversion (e.g., 38V→0.6V) at high frequency without pulse-skipping. |
| Min. Top-Gate Off-Time | 90ns - supports near-100% duty cycle for low-dropout operation and efficient 5V→3.3V or 3.3V→1.2V conversion. |
| Current Sense Range | 30mV to 100mV (programmable via VRNG) - provides flexibility between RSENSE and DCR sensing with consistent accuracy. |
Pinout & Package
Package: 32-pin (5mm × 5mm) plastic QFN with exposed thermal pad (Pin 33 = PGND). Requires soldering of exposed pad to PCB ground plane for thermal performance (θJA = 44°C/W) and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PHASMD (1) | Phase configuration selector | Sets channel 2 phase offset (180°/240°) and CLKOUT phase (60°/90°/120°) relative to channel 1. |
| MODE/PLLIN (2) | Mode control or sync input | Selects forced continuous/discontinuous mode or accepts external clock for synchronization. |
| VOUTSENSE+ (8), VOUTSENSE– (9) | Differential output voltage sense inputs | Enable accurate regulation despite ±500mV ground potential difference between local and remote load grounds. |
| 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 bias stability. |
| DTR (12) | Load-release transient detector | Triggers bottom gate turn-off when voltage drops below 0.5×INTVCC, reducing VOUT overshoot during sudden load removal. |
| TG1/TG2 (15,26), BG1/BG2 (17,24) | Top/bottom gate drivers | Drive N-channel MOSFETs with 2.5Ω pull-up / 0.8–1.2Ω pull-down strength; support bootstrap operation via BOOST1/BOOST2. |
| PGND (20,33) | Power ground terminal | Exposed pad (Pin 33) must be soldered to PCB ground plane for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Differential output voltage sensing | Enables ±0.67% regulation accuracy even with ±500mV ground offset between controller and load - critical for high-current POL applications. |
| Controlled on-time, valley current mode | Delivers fast transient response and stable constant-frequency operation across full VIN/VOUT/load range without compensation tuning. |
| Load-release transient detection (DTR) | Reduces output overshoot by up to 50% during sudden load removal - verified in 30A→0A and 30A→10A transients at 0.6V/5V input. |
| Programmable current sense range (VRNG) | Allows precise 30mV–100mV threshold selection per channel via single VRNG pin, optimizing signal-to-noise ratio for RSENSE or DCR sensing. |
| 2-phase interleaved operation | Cuts input/output ripple current by ~70% vs. single-phase, reduces EMI, and enables higher total output current with smaller magnetics. |
Applications
| Server CPU Core Power | Telecom Point-of-Load |
|---|---|
|
Use Scenario: Delivering 1.2V/30A to high-performance server CPUs with tight voltage tolerance and fast load steps. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing two parallel power stages with interleaved timing to minimize input ripple and improve transient response. Use Value: 30ns tON(MIN) enables stable 38V→1.2V conversion at 2MHz; DTR feature limits overshoot to <40mV during 0A→30A load steps. |
Use Scenario: Generating 3.3V/25A from 48V intermediate bus in telecom line cards with strict EMI requirements. IC Role / Device Role / Timing Role: 2-phase PolyPhase® controller operating at 1MHz with synchronized CLKOUT to coordinate multiple converters in distributed power architecture. Use Value: Interleaving reduces input capacitor RMS current by 45%; differential sensing maintains ±0.67% regulation despite board-level ground bounce. |
| FPGA I/O Bank Supply | Industrial PLC Processing Core |
|
Use Scenario: Providing 1.8V/15A to FPGA I/O banks requiring soft-start tracking and precise voltage sequencing. IC Role / Device Role / Timing Role: Controller using TRACK/SS pin to ramp output in sync with another supply, with adjustable soft-start via external capacitor. Use Value: Internal 1µA TRACK/SS pull-up enables linear ramp; ±0.67% accuracy ensures I/O voltage stays within FPGA VCCIO spec across temperature. |
Use Scenario: Powering ARM-based PLC processors (1.1V/10A) in harsh environments with wide input variation (24V±20%) and thermal stress. IC Role / Device Role / Timing Role: Robust controller with –40°C to 125°C junction rating, UVLO (3.3V–4.5V), and overvoltage protection (±7.5%) for industrial reliability. Use Value: 5mm × 5mm QFN with soldered exposed pad sustains 125°C junction temp at 10A; PGOOD output enables system-level fault monitoring. |
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#TRPBF | Dual-output capable; Channel 2 has ±1% regulation (vs. LTC3839's single-output ±0.67%); separate per-channel current sense range controls. | Required when independent regulation of two outputs (e.g., core + I/O) is needed; less suitable for single high-accuracy output. | Choose LTC3838 if dual-output flexibility outweighs need for tighter single-output accuracy and DTR functionality. |
| MP2960AGQSE-LF-Z | Single-output, 2-phase controller with ±1% output accuracy; no differential sensing; fixed 50mV current sense threshold; no DTR feature. | Targeted at cost-sensitive applications where ±0.67% accuracy and remote ground tolerance are not required. | Choose MP2960 if design tolerates reduced accuracy and lacks need for DTR or differential sensing - lower BOM cost but limited performance headroom. |
Compared with LTC3838IUH#TRPBF and MP2960AGQSE-LF-Z, the LTC3839EUH#TRPBF uniquely combines single-output ±0.67% accuracy, differential remote sensing, and active load-release transient mitigation - making it optimal for high-reliability, high-precision POL systems where output stability under dynamic load is critical.
Availability
LTC3839EUH#TRPBF is available at Aetrix Electronics and suitable for server CPU core power, telecom point-of-load converters, and industrial PLC processing cores requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LTC3839EUH#TRPBF 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 qualification and long-term product support.
The LTC3839EUH#TRPBF belongs to Linear's PolyPhase® controller family, designed specifically for high-efficiency, high-current, multi-phase DC/DC conversion in computing, datacom, and industrial systems demanding precision regulation and fast transient immunity.
FAQ
What is the operating temperature range for the LTC3839EUH#TRPBF?
The LTC3839EUH#TRPBF is rated for a junction temperature range of –40°C to 125°C. This is validated for the EUH grade (industrial temperature range), with thermal performance dependent on proper PCB layout - especially soldering of the exposed PGND pad (Pin 33) to a thermal plane. The device uses design correlation and statistical process controls to assure specifications across this full range.
How does the DTR (Detect Transient) feature work in the LTC3839EUH#TRPBF?
The DTR pin in the LTC3839EUH#TRPBF monitors load-release events: when its voltage falls below 0.5×INTVCC, the controller forces immediate turn-off of the bottom gate drivers (BG1/BG2), allowing inductor current to decay faster and significantly reducing output voltage overshoot. An internal 5µA current source pulls DTR toward INTVCC; tying DTR to INTVCC disables the feature.
Can the LTC3839EUH#TRPBF support inductor DCR current sensing?
Yes, the LTC3839EUH#TRPBF supports both RSENSE and inductor DCR current sensing. For DCR sensing, SENSE+ pins connect to the RC network across the inductor, and SENSE– pins connect to the VOUT-side node - leveraging the internal 500kΩ resistor to SGND on each SENSE– pin for stable bias. The VRNG pin sets the effective sense voltage range (30mV–100mV) for either method.
What is the purpose of the PHASMD pin on the LTC3839EUH#TRPBF?
The PHASMD pin on the LTC3839EUH#TRPBF configures the phase relationship between the two channels and the CLKOUT signal. Pulling PHASMD to SGND sets TG2 at 180° and CLKOUT at 60° relative to TG1; floating sets TG2 at 180° and CLKOUT at 90°; connecting to INTVCC sets TG2 at 240° and CLKOUT at 120° - enabling flexible interleaving for EMI reduction and current sharing.
Does the LTC3839EUH#TRPBF require external components for soft-start and tracking?
Yes - the TRACK/SS pin on the LTC3839EUH#TRPBF uses an internal 1µA temperature-independent current source. A capacitor from TRACK/SS to ground sets soft-start ramp time; connecting an external voltage source enables output voltage tracking. No additional ICs are needed, but capacitor value (e.g., 10nF for ~1ms ramp) must be selected based on desired startup profile.
LTC3839EUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3839EUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3839EUH#TRPBF 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#TRPBF reliable?
The price and inventory of LTC3839EUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3839EUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3839EUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3839EUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3839EUH#TRPBF?
LTC3839EUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3839EUH#TRPBF 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#TRPBF?
For technical support, including LTC3839EUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3839EUH#TRPBF requirements.
6.How does Aetrix verify that LTC3839EUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3839EUH#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3839EUH#TRPBF?
All LTC3839EUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3839EUH#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3839EUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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