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Analog Devices Inc. LTC3838EUHF#TRPBF
- Part No.:
- LTC3838EUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3838EUHF#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,083
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Product details
Overview
LTC3838EUHF#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, PolyPhase® synchronous step-down DC/DC controller driving all-N-channel MOSFETs. It delivers ±0.67% output voltage accuracy on Channel 1 with differential sensing, supports 4.5V–38V input and 0.6V–5.5V output ranges, and enables fast transient response via controlled on-time valley current mode control - used in high-density point-of-load converters for computing and datacom systems.
For engineers reviewing the LTC3838EUHF#TRPBF datasheet, LTC3838EUHF#TRPBF pinout, LTC3838EUHF#TRPBF application, or LTC3838EUHF#TRPBF equivalent, key selection criteria include its 30ns minimum on-time, dual-channel phase programmability, DTR-based overshoot suppression, differential remote sensing capability up to ±500mV ground offset, and support for RSENSE or DCR current sensing.
Technical Context
The LTC3838EUHF#TRPBF implements a controlled on-time, valley current mode architecture that ensures constant-frequency operation independent of VIN, VOUT, and load - enabling predictable EMI behavior and simplified filter design. Its dual-channel structure supports independent regulation or PolyPhase interleaving with programmable phase offsets (0°/180°/240°) via the PHASMD pin.
Channel 1 features differential output sensing (VOUTSENSE1+ / VOUTSENSE1–) referenced to remote ground, enabling accurate regulation even with ±500mV PCB ground potential difference. Channel 2 uses single-ended sensing (VFB2) with ±1% accuracy. Both channels support tON(MIN) = 30ns and tOFF(MIN) = 90ns, allowing near-0% and near-100% duty cycles for wide VIN/VOUT ratios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V - supports wide-input industrial and telecom power rails without pre-regulation. |
| Output Voltage Accuracy (Ch1) | ±0.67% over temperature with differential sensing - maintains tight regulation despite remote ground noise or IR drop. |
| Min On-Time / Off-Time | 30ns / 90ns - enables high step-down ratios (e.g., 36V→0.6V at 500kHz) and high-frequency operation up to 2MHz. |
| Switching Frequency Range | 200kHz to 2MHz, programmable via RT resistor or synchronizable to external clock - allows EMI optimization and multi-phase coordination. |
| Current Sensing Options | RSENSE or inductor DCR - eliminates sense resistor losses while supporting accurate valley current limiting in continuous/discontinuous modes. |
| Detect Transient (DTR) | Hardware-based load-release transient detection - reduces output overshoot by forcing BG turn-off during rapid current decay. |
| Package | 38-pin (5mm × 7mm) QFN with exposed PGND pad - provides low thermal resistance (θJA = 34°C/W) for high-current POL applications. |
Pinout & Package
Package: 38-lead (5mm × 7mm) plastic QFN (UHF), exposed pad connected to PGND. Thermal performance optimized for high-power density designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 4.5V–38V; powers internal bias circuits and gate drivers via INTVCC/DRVCC regulators. |
| TG1/TG2 | Top gate driver outputs | Drive N-channel MOSFET gates with swing between SWx and BOOSTx; require external bootstrap capacitors. |
| BG1/BG2 | Bottom gate driver outputs | Drive N-channel MOSFET gates between PGND and DRVCCx; support high-side synchronous rectification. |
| VOUTSENSE1+/– | Differential feedback inputs (Ch1) | Enable remote-sense regulation with ±500mV common-mode ground tolerance - critical for low-voltage, high-current CPU/GPU rails. |
| SENSE1+/–, SENSE2+/– | Differential current sense inputs | Support Kelvin RSENSE or DCR sensing; internal 500kΩ resistor on SENSE– pins aids DCR network biasing. |
| DTR1/DTR2 | Load-release transient detection | Hardware signal triggering fast BG turn-off when load drops - reduces VOUT overshoot without software intervention. |
| PHASMD | Phase configuration control | Selects 180° (ground), 180°/90° (floating), or 240°/120° (INTVCC) relative phase between channels and CLKOUT. |
| MODE/PLLIN | Mode selection or sync input | Configures forced continuous/discontinuous mode or accepts external clock (±30% lock range) for system-wide timing alignment. |
Key Features
| Feature | Design Value |
|---|---|
| Differential output sensing (Ch1) | Enables ±0.67% regulation accuracy despite ±500mV remote ground deviation - eliminates IR-drop-induced voltage error in high-current PCB traces. |
| Controlled on-time valley current mode | Delivers fast transient response and stable constant-frequency operation across full line/load/temperature range - simplifies loop compensation and EMI filtering. |
| 30ns minimum on-time | Supports direct 36V-to-0.6V conversion at 500kHz without cascaded stages - reduces component count and board area in high-input systems. |
| Load-release transient detection (DTR) | Reduces output overshoot by >40% during 15A→0A transients - protects downstream logic and memory from overvoltage stress. |
| Programmable current sense range | VRNG1/VRNG2 pins set max sense voltage (30mV/50mV/100mV) - optimizes signal-to-noise ratio for RSENSE or DCR sensing across varying current levels. |
| Independent soft-start & tracking | TRACK/SS1 and TRACK/SS2 pins allow coordinated power sequencing or voltage ramping - essential for FPGA, ASIC, and multi-rail processor startup. |
Applications
| Server CPU Core Power | Telecom Baseband Card |
|---|---|
Use Scenario: High-current, low-voltage core supply (e.g., 1.2V/15A) for x86 or ARM processors in 1U servers. IC Role / Device Role / Timing Role: Dual-channel PolyPhase controller managing two parallel buck phases with 180° interleaving to halve input/output ripple current. Use Value: Achieves >90% efficiency at full load while maintaining ±0.67% output accuracy despite PCB ground bounce - ensuring reliable CPU operation under dynamic workloads. | Use Scenario: Distributed 3.3V and 5V supplies on LTE/5G baseband processing cards with strict EMI limits. IC Role / Device Role / Timing Role: Independent dual-channel controller generating isolated outputs synchronized to a common 333kHz system clock via MODE/PLLIN. Use Value: Enables deterministic switching frequency and phase alignment across multiple power rails - simplifying EMI filter design and reducing conducted emissions. |
| FPGA I/O Bank Supply | Industrial PLC Backplane |
Use Scenario: Sequenced 1.8V and 2.5V supplies for FPGA I/O banks requiring precise voltage tracking during startup. IC Role / Device Role / Timing Role: Uses TRACK/SS1 and TRACK/SS2 pins to ramp both outputs proportionally from 0V to target, preventing I/O contention or latch-up. Use Value: Eliminates need for external sequencing ICs - reduces BOM cost and layout complexity while guaranteeing monotonic, glitch-free power-up. | Use Scenario: Robust 5V/3A and 12V/2A auxiliary supplies in programmable logic controllers operating in harsh industrial environments. IC Role / Device Role / Timing Role: Leverages DTR1/DTR2 and overvoltage protection to survive sudden load dumps and inductive kickback from solenoid drivers. Use Value: Maintains stable output during 10A/ms load transients - prevents PLC firmware resets and ensures deterministic real-time control execution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3838-1 | Both channels offer ±0.67%/±0.75% differential regulation; single-pin VRNG control; improved current limit accuracy. | Preferred where matched accuracy across both outputs is required (e.g., DDR memory VDDQ/VTT tracking). | Select LTC3838-1 when identical high-accuracy differential sensing on both channels justifies slightly higher cost and different VRNG implementation. |
| MP2918GL-Z | Single-channel, integrated MOSFETs; lower pin count; no differential sensing; fixed 600kHz frequency. | Suitable for space-constrained, medium-current (≤30A) applications where remote sensing and dual-phase flexibility are not needed. | Choose MP2918GL-Z only for cost-sensitive, low-complexity single-output designs - not a functional replacement for LTC3838EUHF#TRPBF's dual-channel, differential-sense capability. |
Compared with LTC3838-1 and MP2918GL-Z, the LTC3838EUHF#TRPBF uniquely balances high-accuracy differential regulation on Channel 1 with flexible independent/interleaved operation on Channel 2, while supporting ultra-low on-times and hardware-based transient suppression - making it optimal for high-performance, multi-rail POL systems demanding precision and responsiveness.
Availability
LTC3838EUHF#TRPBF is available at Aetrix Electronics and suitable for server CPU core power, telecom baseband card supplies, FPGA I/O bank regulation, and industrial PLC backplane power requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3838EUHF#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 continues its legacy of high-performance analog and power management ICs for demanding applications.
The LTC3838EUHF#TRPBF belongs to Linear's PolyPhase® synchronous buck controller product line, designed specifically for high-efficiency, high-current point-of-load conversion in computing, networking, and industrial systems where accuracy, transient response, and thermal performance are critical.
FAQ
What is the maximum supported switching frequency for the LTC3838EUHF#TRPBF?
The LTC3838EUHF#TRPBF supports a programmable switching frequency from 200kHz to 2MHz using an external resistor on the RT pin. When synchronized to an external clock via the MODE/PLLIN pin, the input clock must be within ±30% of the RT-set frequency to ensure lock. The LTC3838EUHF#TRPBF maintains stable operation across this full range with minimal jitter and consistent valley current mode behavior.
Does the LTC3838EUHF#TRPBF support differential voltage sensing on both channels?
No, the LTC3838EUHF#TRPBF supports differential output sensing only on Channel 1 (via VOUTSENSE1+ and VOUTSENSE1– pins), delivering ±0.67% accuracy even with ±500mV ground offset. Channel 2 uses single-ended sensing at VFB2 with ±1% regulation accuracy. For dual-channel differential sensing, the pin-compatible LTC3838-1 variant is required.
How does the DTR feature in the LTC3838EUHF#TRPBF reduce output overshoot?
The DTR1/DTR2 pins in the LTC3838EUHF#TRPBF detect rapid load reduction by monitoring a voltage threshold relative to INTVCC. When the DTR pin voltage falls below half of INTVCC during load release, the controller forces immediate bottom gate (BG) turn-off, allowing inductor current to decay faster and minimizing VOUT overshoot. This hardware-based response occurs in nanoseconds - far quicker than error amplifier-based compensation.
Can the LTC3838EUHF#TRPBF operate with inductor DCR current sensing?
Yes, the LTC3838EUHF#TRPBF fully supports inductor DCR current sensing on both channels using the SENSE1+/– and SENSE2+/– pins. It includes internal circuitry to bias the DCR sense network and compensates for temperature drift of the inductor's DCR. The VRNG1/VRNG2 pins configure the effective current sense range, allowing optimization for DCR values typical in high-current POL inductors.
What is the thermal resistance (θJA) of the LTC3838EUHF#TRPBF package?
The LTC3838EUHF#TRPBF uses a 38-pin (5mm × 7mm) QFN package (UHF) with an exposed PGND pad soldered to the PCB. Its specified junction-to-ambient thermal resistance (θJA) is 34°C/W under standard JEDEC test conditions. Effective thermal performance depends on PCB copper area, layer count, and thermal vias under the exposed pad - recommended layout practices are detailed in Linear's application notes for the LTC3838EUHF#TRPBF.
LTC3838EUHF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 38-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:
- 38-QFN (5x7)
LTC3838EUHF#TRPBF FAQ
1.How can I place an order for LTC3838EUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3838EUHF#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 LTC3838EUHF#TRPBF reliable?
The price and inventory of LTC3838EUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3838EUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3838EUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3838EUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3838EUHF#TRPBF?
LTC3838EUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3838EUHF#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 LTC3838EUHF#TRPBF?
For technical support, including LTC3838EUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3838EUHF#TRPBF requirements.
6.How does Aetrix verify that LTC3838EUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3838EUHF#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 LTC3838EUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3838EUHF#TRPBF?
All LTC3838EUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3838EUHF#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 LTC3838EUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3838EUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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