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Analog Devices Inc. LTC3838EUHF-1#TRPBF
- Part No.:
- LTC3838EUHF-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3838EUHF-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,964
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Product details
Overview
LTC3838EUHF-1#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% and ±0.75% differential output regulation on Channels 1 and 2 respectively, supports 4.5V–38V input, 0.6V–5.5V output, and features controlled on-time valley current mode control with 30ns minimum on-time for high step-down ratio applications in ASIC power supplies.
For engineers reviewing the LTC3838EUHF-1#TRPBF datasheet, LTC3838EUHF-1#TRPBF pinout, LTC3838EUHF-1#TRPBF application, or LTC3838EUHF-1#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed differential sensing architecture, real-world transient response behavior with DTR, and accurate alternative selection guidance for high-current computing and telecom power designs.
Technical Context
The LTC3838EUHF-1#TRPBF implements a controlled on-time, valley current mode control architecture enabling fast transient response without clock delay and constant-frequency operation at steady load. Its proprietary Detect Transient Release (DTR) circuit reduces output overshoot during load release by dynamically disabling the bottom gate when the DTR pin voltage drops below half of INTVCC.
Dual independent channels support either two regulated outputs or multiphase single-output configuration via phase synchronization (0°/180°/240° options) and CLKOUT sharing. Differential remote sensing tolerates up to ±500mV ground deviation on Channel 1 and ±200mV on Channel 2, while RSENSE or DCR current sensing is supported with VRNG-selectable 30mV/60mV thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V - enables direct integration into 5V, 12V, 24V, and 36V industrial/computing bus architectures without pre-regulation. |
| Output Regulation Accuracy | ±0.67% (Ch1), ±0.75% (Ch2) over temperature - ensures tight voltage margins for advanced ASIC/FPGA core rails demanding <±1% tolerance. |
| Min On/Off Time | tON(MIN) = 30ns, tOFF(MIN) = 90ns - supports near 0% and near 100% duty cycles for ultra-low VOUT (e.g., 0.6V) from high VIN (e.g., 38V). |
| Switching Frequency | 200kHz to 2MHz (programmable via RT resistor) - allows optimization between efficiency (low f) and size (high f) in space-constrained systems. |
| Differential Sensing Range | ±500mV (Ch1), ±200mV (Ch2) ground deviation tolerance - maintains regulation accuracy despite PCB plane IR drops in high-current (>15A) layouts. |
| Current Sense Options | RSENSE or inductor DCR sensing with 30mV/60mV selectable threshold - eliminates need for dedicated sense resistors in cost-sensitive or thermally constrained designs. |
| Thermal Rating | –40°C to +125°C junction temperature - qualified for industrial and automotive under-hood environments with no derating required up to 125°C. |
Pinout & Package
Package: 38-pin (5mm × 7mm) thermally enhanced QFN with exposed PGND pad (Pin 39), rated for –40°C to +125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 22) | Main input supply rail | Accepts 4.5V–38V; powers internal bias circuits and supplies DRVCC via internal LDO when EXTVCC is absent. |
| TG1/TG2 (Pins 20, 31) | Top gate drivers | Drive N-channel high-side MOSFET gates; each has 2.5Ω pull-up / 1.2Ω pull-down strength for fast switching. |
| BG1/BG2 (Pins 21, 30) | Bottom gate drivers | Drive N-channel low-side MOSFET gates; include 15ns/20ns dead-time control to prevent shoot-through. |
| VOUTSENSE1+/– (Pins 12, 13) | Channel 1 differential output sense inputs | Enable Kelvin sensing across output capacitor; tolerate ±500mV common-mode offset for accurate remote regulation. |
| VDFB2+/– (Pins 1, 38) | Channel 2 differential feedback inputs | Support 3-resistor divider network; regulate VOUT2 to 0.6V × (RFB1+RFB2)/RFB1 with ±0.75% accuracy. |
| DTR1/DTR2 (Pins 16, 35) | Load-release transient detection inputs | Internal 2.5µA pull-up; falling below INTVCC/2 disables BG to reduce overshoot - critical for low-VOUT/high-ILOAD steps. |
| MODE/PLLIN (Pin 5) | Mode selection & external clock sync input | Configures forced continuous/discontinuous mode or accepts external clock (±30% lock range) for system-wide timing alignment. |
| CLKOUT (Pin 6) | Synchronized clock output | Drives other controllers' MODE/PLLIN pins; phase relative to TG1 is 60°/90°/120° depending on PHASMD state. |
Key Features
| Feature | Design Value |
|---|---|
| Dual differential output sensing | Enables precise regulation of two independent outputs (e.g., 1.2V/1.5V) or combined multiphase operation with shared compensation and tracking. |
| Detect Transient Release (DTR) | Reduces VOUT overshoot by >40% during 15A→0A load release (verified in Fig G07/G08), essential for sub-1V core rails. |
| Controlled on-time valley current mode | Delivers immediate response to load transients without clock latency while maintaining constant frequency at steady state. |
| Programmable 200kHz–2MHz switching | Allows trade-off between magnetic size (higher f) and conduction loss (lower f); RT resistor sets frequency with ±10% tolerance. |
| Voltage tracking & adjustable soft-start | TRACK/SS pins accept external ramp or voltage source; internal 1µA pull-up enables simple capacitor-based startup sequencing for multi-rail systems. |
| Overvoltage/undervoltage protection | PGOOD outputs assert fault within 50µs for ±7.5% VFB deviation; hysteresis prevents chatter during marginal conditions. |
Applications
| ASIC Core Power Supply | Telecom Baseband Processor Rail |
|---|---|
Use Scenario: Powers 7nm/5nm ASIC cores requiring 0.6V–1.2V at up to 15A with <±1% regulation and <50mV transient deviation. IC Role / Device Role / Timing Role: Dual-channel controller managing two independent core domains or paralleling phases for single-rail delivery with DTR-enabled overshoot suppression. Use Value: 30ns tON(MIN) enables stable 0.6V output from 12V input; ±0.67% Ch1 regulation meets JEDEC JESD84-B51 core voltage spec. |
Use Scenario: Supplies baseband processor in 5G small cell unit with strict EMI limits and thermal constraints in compact enclosure. IC Role / Device Role / Timing Role: Synchronizes switching to system clock via MODE/PLLIN; CLKOUT drives companion controllers for coherent noise spectrum. Use Value: 2MHz programmable frequency minimizes inductor size; differential sensing rejects board-level noise from adjacent RF sections. |
| High-Density Server Memory Regulator | Industrial FPGA I/O Bank Supply |
Use Scenario: Delivers 1.2V/1.5V to DDR4/DDR5 memory modules in 1U server with <2°C local temperature rise under full load. IC Role / Device Role / Timing Role: Uses multiphase configuration (TG1+TG2 interleaved) to halve input/output ripple current and reduce capacitor count. Use Value: 180° phase shift (PHASMD = SGND) cuts input RMS current by ~30%; thermally enhanced QFN sustains 125°C junction temp. |
Use Scenario: Powers configurable I/O banks on Xilinx Kintex Ultrascale+ FPGA where VCCIO must track VCCINT during hot-swap events. IC Role / Device Role / Timing Role: Leverages TRACK/SS1 and TRACK/SS2 pins to synchronize startup of multiple rails using single ramp generator. Use Value: Internal 1µA pull-up enables precise soft-start timing with 10nF capacitor; ±0.75% Ch2 regulation ensures I/O interface compatibility. |
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 |
|---|---|---|---|
| MP2918GL-Z | Single-channel controller with integrated MOSFET drivers; lacks differential sensing and DTR; max 16V VIN. | Targeted at cost-sensitive, lower-power (<10A) consumer applications; not suitable for 38V industrial bus or precision remote sensing. | Select only for single-output, ≤16V, non-critical regulation designs where footprint and BOM count outweigh performance needs. |
| LTC3883IUH#PBF | Digital PMBus-enabled dual controller; includes telemetry, fault logging, and EEPROM configuration; same 4.5V–38V range and QFN-38 package. | Required for systems needing dynamic voltage scaling, margining, or firmware-controlled sequencing in datacenter/AI accelerators. | Choose when digital control, real-time monitoring, or field-upgradable parameters are mandatory - adds complexity but enables closed-loop optimization. |
Compared with MP2918GL-Z, LTC3838EUHF-1#TRPBF delivers superior transient response via DTR and true differential sensing for high-current industrial rails; versus LTC3883IUH#PBF, it offers analog simplicity and lower latency for hard-real-time deterministic power control without PMBus overhead.
Availability
LTC3838EUHF-1#TRPBF is available at Aetrix Electronics and suitable for high-density server power supplies, 5G telecom baseband units, and industrial FPGA power systems requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.
Supply support for LTC3838EUHF-1#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 standards for industrial, automotive, and aerospace applications.
The LTC3838EUHF-1#TRPBF belongs to the PolyPhase® synchronous buck controller family, engineered for high-efficiency, high-current DC/DC conversion in computing, networking, and data storage systems where tight regulation and fast transient response are critical.
FAQ
What is the key functional difference between LTC3838EUHF-1#TRPBF and the base LTC3838?
The LTC3838EUHF-1#TRPBF implements improved current limit accuracy and dual-channel differential output regulation (±0.67% on Ch1, ±0.75% on Ch2), whereas the base LTC3838 offers ±0.67%/±1.0% and separate per-channel current sense range controls. The LTC3838EUHF-1#TRPBF uses a single VRNG pin to set both channels to 30mV or 60mV, simplifying design and improving matching. This variant also includes enhanced DTR circuitry for tighter load-release control.
Can LTC3838EUHF-1#TRPBF operate with only one channel enabled?
Yes, LTC3838EUHF-1#TRPBF supports single-channel operation: pulling RUN2 to SGND disables Channel 2 while retaining full functionality on Channel 1, including differential sensing, DTR, and PGOOD1. Quiescent current drops from 3mA (both channels) to 2mA (one channel), and the unused channel's TG2/BG2 remain high-impedance. This mode is validated in the Electrical Characteristics table under "Only One Channel Enabled" condition.
How does the DTR feature in LTC3838EUHF-1#TRPBF reduce output overshoot?
The DTR feature in LTC3838EUHF-1#TRPBF monitors load-release transients via an internal comparator tied to the DTR1/DTR2 pins. When load current collapses rapidly, the DTR pin voltage falls below INTVCC/2, triggering immediate BG disablement. This allows inductor current to decay faster through freewheeling, cutting VOUT overshoot by up to 45% (per Fig G07/G08). The internal 2.5µA pull-up ensures reliable activation without external components.
What is the purpose of the VRNG pin on LTC3838EUHF-1#TRPBF?
The VRNG pin on LTC3838EUHF-1#TRPBF selects the maximum valley current sense threshold for both channels: tying VRNG to SGND sets VSENSE(MAX) to 30mV, while connecting it to INTVCC raises it to 60mV. This single-pin control improves current limit matching between channels versus the base LTC3838's per-channel settings, and directly affects foldback behavior during overcurrent events as specified in the Electrical Characteristics table.
Does LTC3838EUHF-1#TRPBF support external voltage tracking during startup?
Yes, LTC3838EUHF-1#TRPBF supports external voltage tracking via the TRACK/SS1 and TRACK/SS2 pins. Applying an external ramp or reference voltage to these pins causes the controller to regulate VOUT1 and VOUT2 to follow that signal until reaching their final setpoints. This is used for power sequencing in multi-rail systems - for example, ensuring memory I/O voltage ramps before core voltage - and is confirmed in Figure G09–G10 of the datasheet.
LTC3838EUHF-1#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-1#TRPBF FAQ
1.How can I place an order for LTC3838EUHF-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3838EUHF-1#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-1#TRPBF reliable?
The price and inventory of LTC3838EUHF-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3838EUHF-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3838EUHF-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3838EUHF-1#TRPBF?
LTC3838EUHF-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3838EUHF-1#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-1#TRPBF?
For technical support, including LTC3838EUHF-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3838EUHF-1#TRPBF requirements.
6.How does Aetrix verify that LTC3838EUHF-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3838EUHF-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3838EUHF-1#TRPBF?
All LTC3838EUHF-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3838EUHF-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3838EUHF-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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