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Analog Devices Inc. LTC3838IUHF#TRPBF
- Part No.:
- LTC3838IUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3838IUHF#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,625
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Product details
Overview
LTC3838IUHF#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 via differential sensing, supports 4.5V–38V input and 0.6V–5.5V output ranges, and enables fast transient response with controlled-on-time valley current mode control - used in high-density point-of-load converters for computing and datacom systems.
For engineers reviewing the LTC3838IUHF#TRPBF datasheet, LTC3838IUHF#TRPBF pinout, LTC3838IUHF#TRPBF application, or LTC3838IUHF#TRPBF equivalent, key selection criteria include differential remote-sense capability (±500mV ground offset tolerance), 30ns minimum on-time, 200kHz–2MHz programmable switching frequency, and independent channel configuration for single- or dual-output designs.
Technical Context
The LTC3838IUHF#TRPBF implements valley current mode control with controlled-on-time architecture, enabling constant-frequency operation independent of VIN, VOUT, and load. Its DTR (Detect Transient Release) feature actively reduces output overshoot during rapid load release by disabling BG drivers when DTR pins fall below INTVCC/2.
Differential sensing on Channel 1 uses VOUTSENSE1+ and VOUTSENSE1– to reject up to ±500mV common-mode ground shift between remote and local grounds. Channel 2 operates with single-ended sensing referenced to SGND and offers ±1% regulation - configurable as independent output or PolyPhase partner to Channel 1.
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 PCB ground bounce or connector voltage drop. |
| Min On/Off Time | tON(MIN) = 30ns, tOFF(MIN) = 90ns - enables high VIN-to-low VOUT conversion (e.g., 36V→0.6V) at high frequency without pulse-skipping. |
| Switching Frequency | 200kHz to 2MHz, resistor-programmable or external clock-synchronizable - allows EMI optimization and inductor size reduction. |
| Current Sense Options | RSENSE or DCR sensing per channel, with VRNG-selectable 30mV/60mV/100mV max sense range - supports precision lossless current monitoring. |
| Thermal Rating | –40°C to +125°C junction temperature - qualified for extended-temperature industrial and embedded applications. |
| Package | 38-pin (5mm × 7mm) QFN with exposed PGND pad - provides low thermal resistance (θJA = 34°C/W) for high-current operation. |
Pinout & Package
38-pin (5mm × 7mm) plastic QFN package with exposed PGND pad (Pin 39), thermally enhanced for high-power density layouts. Pin functions validated per Linear Technology LTC3838 datasheet Rev. FB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 24) | Main input supply rail | Accepts 4.5V–38V; powers internal bias circuits and supplies DRVCC regulator input. |
| BOOST1/BOOST2 (Pins 19,32 / 23,36) | Floating gate drive supplies | Provide boosted voltage for top N-MOSFET gate drive; swing from (DRVCC – VD) to (VIN + DRVCC – VD). |
| TG1/TG2 (Pins 20,31 / 24,35) | Top gate drivers | Drive N-MOSFET gates with VDRVCC swing between SW and BOOST nodes. |
| BG1/BG2 (Pins 22,29 / 26,33) | Bottom gate drivers | Drive N-MOSFET gates between PGND and DRVCC; support synchronous rectification. |
| VOUTSENSE1+/VOUTSENSE1– (Pins 12,13) | Differential output sense inputs (Ch1) | Enable ±0.67% regulation with up to ±500mV ground offset - critical for remote point-of-load sensing. |
| SENSE1+/SENSE1– (Pins 14,15) | Differential current sense inputs (Ch1) | Support Kelvin RSENSE or DCR sensing; SENSE– has internal 500kΩ to SGND for DCR biasing. |
| DTR1/DTR2 (Pins 16,35 / 20,1) | Load-release transient detection | When pulled < INTVCC/2, disables BG to accelerate inductor current decay and suppress VOUT overshoot. |
| TRACK/SS1/SS2 (Pins 11,1 / 15,5) | Soft-start and tracking control | Internal 1µA pull-up enables capacitor-based ramp; external voltage source enables output voltage tracking. |
Key Features
| Feature | Design Value |
|---|---|
| Differential output sensing (Ch1) | Rejects ±500mV ground potential difference between IC and load - eliminates regulation error from PCB IR drop. |
| Controlled-on-time valley current mode | Delivers fast transient response while maintaining constant switching frequency across line, load, and temperature. |
| Load-release transient detection (DTR) | Reduces output overshoot by dynamically disabling bottom FET during rapid load removal - verified in 15A→0A steps. |
| Independent channel configuration | Channel 2 can operate as standalone ±1% regulator or synchronize with Channel 1 in PolyPhase mode for higher current or lower ripple. |
| Programmable current sense range | VRNG1/VRNG2 pins select 30mV/60mV/100mV max sense voltage - optimizes signal-to-noise ratio for RSENSE or DCR sensing. |
Applications
| Server VR13 CPU Core Power | Telecom Intermediate Bus Converter |
|---|---|
Use Scenario: Delivering tightly regulated 0.8V–1.2V at up to 15A to modern multi-core CPUs with dynamic load steps exceeding 10A/µs. IC Role / Device Role / Timing Role: Dual-channel controller managing two parallel phases with interleaved timing to reduce input/output ripple and improve transient response. Use Value: Differential sensing maintains ±0.67% accuracy despite voltage drop across motherboard planes; DTR minimizes overshoot during core sleep/wake transitions. | Use Scenario: Converting 48V intermediate bus to 3.3V/5V for line cards in 5G base stations with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: High-VIN step-down controller operating at 500kHz–1MHz with external clock synchronization to avoid slot harmonics. Use Value: 30ns min on-time enables direct 48V→3.3V conversion; QFN package supports compact layout with low θJA for convection-cooled chassis. |
| Industrial PLC I/O Module Supply | AI Accelerator Board Power |
Use Scenario: Generating isolated 1.8V/3.3V rails from 24V field supply in harsh environments with wide temperature variation. IC Role / Device Role / Timing Role: Dual-output controller providing independent, tracked startup for analog and digital subsystems with soft-start sequencing. Use Value: TRACK/SS pins enable voltage ramp coordination; –40°C to +125°C rating ensures reliability in uncontrolled enclosures. | Use Scenario: Powering GPU or FPGA VDD cores requiring >100A aggregate current with sub-10mV regulation window. IC Role / Device Role / Timing Role: One of multiple LTC3838 controllers in multiphase array, synchronized via CLKOUT/MODE-PLLIN to minimize input capacitor RMS current. Use Value: Phase-selectable outputs (0°/180°/240°) enable optimal interleaving; 2MHz capability shrinks passive components for high-density AI modules. |
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 |
|---|---|---|---|
| LTC3838-1IUHF#TRPBF | Both channels offer ±0.67%/±0.75% differential regulation; single-pin VRNG control; improved current limit accuracy. | Required where Channel 2 also needs remote sensing (e.g., dual remote loads), not just local regulation. | Select when identical differential sensing accuracy is needed on both outputs - not a drop-in replacement due to VRNG pin behavior change. |
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFET drivers; fixed 600kHz frequency; no differential sensing. | Suitable for cost-sensitive, space-constrained designs where ±1% accuracy and local sensing suffice. | Choose for simplified BOM and layout where remote ground rejection and ultra-tight regulation are not required. |
Compared with LTC3838-1IUHF#TRPBF and MP2918GL-Z, the LTC3838IUHF#TRPBF uniquely balances high-accuracy differential sensing on Channel 1 with flexible independent Channel 2 operation - making it optimal for mixed-signal systems needing one precision rail and one general-purpose rail.
Availability
LTC3838IUHF#TRPBF is available at Aetrix Electronics and suitable for server VRMs, telecom power supplies, industrial PLCs, and AI accelerator boards requiring stable component supply across long production lifecycles.
Supply support for LTC3838IUHF#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3838IUHF#TRPBF belongs to Linear's high-performance power controller family, designed specifically for demanding point-of-load and distributed power applications requiring precision regulation, fast transients, and robust thermal performance.
FAQ
What is the maximum input voltage rating for the LTC3838IUHF#TRPBF?
The LTC3838IUHF#TRPBF has an absolute maximum VIN rating of 40V, with recommended continuous operation from 4.5V to 38V. Exceeding 40V may cause permanent damage. The device includes internal protection against overvoltage on BOOST, SW, and other pins - but system-level clamping is advised for transient-prone 48V bus applications.
Does the LTC3838IUHF#TRPBF support both RSENSE and DCR current sensing?
Yes, the LTC3838IUHF#TRPBF supports both methods on each channel. SENSE+ and SENSE– pins accept Kelvin-connected shunt resistors or DCR sense networks. For DCR sensing, the internal 500kΩ resistor from SENSE– to SGND provides bias; for RSENSE, 4-wire connection is required to reject trace resistance errors.
How does the DTR (Detect Transient Release) feature work in the LTC3838IUHF#TRPBF?
The DTR feature in the LTC3838IUHF#TRPBF monitors load-release events: when current drops rapidly, the DTR pin voltage falls below INTVCC/2, triggering immediate BG driver disable. This allows inductor current to decay faster through freewheeling paths, reducing VOUT overshoot - validated in 15A→0A tests with up to 70% overshoot reduction versus standard operation.
Can the LTC3838IUHF#TRPBF be configured for single-output PolyPhase operation?
Yes, the LTC3838IUHF#TRPBF can configure both channels as interleaved phases for a single output. PHASMD pin sets relative phase (0°/180°/240°); MODE/PLLIN enables forced continuous mode and synchronization. Channel 1 provides differential sensing; Channel 2 contributes additional current capacity and ripple cancellation - ideal for high-current CPU/GPU rails.
What is the purpose of the VRNG1 and VRNG2 pins on the LTC3838IUHF#TRPBF?
The VRNG1 and VRNG2 pins on the LTC3838IUHF#TRPBF set the maximum current sense threshold: (VSENSE+ – VSENSE–) = 0.05 × VRNG. Tying VRNG to SGND yields 30mV range; to INTVCC yields 50mV; to 2V yields 100mV. This allows optimization of sense resistor value and noise immunity for specific current-sensing topology and accuracy requirements.
LTC3838IUHF#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)
LTC3838IUHF#TRPBF FAQ
1.How can I place an order for LTC3838IUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3838IUHF#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 LTC3838IUHF#TRPBF reliable?
The price and inventory of LTC3838IUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3838IUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3838IUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3838IUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3838IUHF#TRPBF?
LTC3838IUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3838IUHF#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 LTC3838IUHF#TRPBF?
For technical support, including LTC3838IUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3838IUHF#TRPBF requirements.
6.How does Aetrix verify that LTC3838IUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3838IUHF#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 LTC3838IUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3838IUHF#TRPBF?
All LTC3838IUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3838IUHF#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 LTC3838IUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3838IUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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