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Analog Devices Inc. LTC3838IUHF-1#TRPBF
- Part No.:
- LTC3838IUHF-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3838IUHF-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,071
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Product details
Overview
LTC3838IUHF-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 LTC3838IUHF-1#TRPBF datasheet, LTC3838IUHF-1#TRPBF pinout, LTC3838IUHF-1#TRPBF application, or LTC3838IUHF-1#TRPBF equivalent, key selection criteria include differential remote sensing capability (±500mV ground deviation tolerance on VOUT1), detect transient release (DTR) for overshoot suppression at low-VOUT loads, and programmable 200kHz–2MHz switching frequency with external synchronization support.
Technical Context
The LTC3838IUHF-1#TRPBF implements a controlled on-time, valley current mode architecture enabling fast transient response without clock delay and constant-frequency operation under steady load. Its proprietary DTR circuit monitors load-release events to dynamically disable bottom gate drivers, reducing output voltage overshoot during rapid current reduction.
It supports dual independent outputs or multiphase single-output configuration via phase-selectable TG2 timing (0°/180°/240° relative to TG1) and includes dual differential feedback paths: VOUTSENSE1± for Channel 1 and VDFB2± for Channel 2, each with dedicated error amplifiers (ITH1/ITH2) and tracking/soft-start inputs (TRACK/SS1/SS2).
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 Accuracy | ±0.67% (VOUT1), ±0.75% (VOUT2) over temperature - ensures tight regulation for sensitive ASIC/FPGA core supplies. |
| 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. |
| Switching Frequency | 200kHz to 2MHz, programmable via RT resistor or synchronizable to external clock - allows EMI optimization and inductor size reduction. |
| Differential Sensing Range | ±500mV (VOUTSENSE1±), ±200mV (VDFB2±) ground deviation tolerance - maintains regulation accuracy despite PCB plane IR drops. |
| Current Sense Options | RSENSE or inductor DCR sensing - provides flexibility for efficiency vs. cost trade-offs in high-current designs. |
| Thermal Rating | –40°C to +125°C junction temperature - qualified for industrial and automotive under-hood environments. |
Pinout & Package
Package: 38-lead (5mm × 7mm) plastic QFN with exposed PGND pad (Pin 39), thermally enhanced for high-power density applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUTSENSE1+ | Differential sense (+) input, Channel 1 | Connects to positive terminal of VOUT1 output capacitor; enables accurate remote sensing of regulated output voltage. |
| VOUTSENSE1– | Differential sense (–) input, Channel 1 | Connects to negative terminal of VOUT1 output capacitor; tolerates up to ±500mV ground deviation vs. SGND. |
| VDFB2+, VDFB2– | Differential feedback inputs, Channel 2 | Form 3-resistor divider network to regulate VOUT2 differentially; supports ±200mV common-mode offset. |
| DTR1, DTR2 | Load-release transient detection | Pulled internally to INTVCC; falling below 0.5×INTVCC triggers BG shutdown to suppress VOUT overshoot during rapid load decrease. |
| TG1, TG2 / BG1, BG2 | Top/bottom gate drivers | Drive N-channel MOSFET gates; feature matched pull-up/pull-down resistances (TG: 2.5Ω/1.2Ω, BG: 2.5Ω/0.8Ω) for precise dead-time control. |
| MODE/PLLIN | Mode select / sync input | Selects forced continuous/discontinuous mode or accepts external clock (200–2.6MHz) for system-wide frequency alignment. |
| PHASMD | Phase configuration input | Sets TG2 phase relative to TG1 (180°/240°) and CLKOUT phase (60°/90°/120°) for optimal multiphase current sharing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual differential output sensing | Enables ±0.67%/±0.75% regulation accuracy across wide temperature and load ranges while rejecting PCB ground noise up to ±500mV. |
| Detect Transient Release (DTR) | Reduces VOUT overshoot by up to 50% during 15A→0A load release (measured at 0.6V/5V input), critical for low-voltage, high-current ASIC supplies. |
| Controlled on-time valley current mode | Delivers immediate response to load transients without clock-cycle latency and maintains constant frequency under steady-state conditions. |
| Programmable 200kHz–2MHz switching | Allows optimization of magnetic component size, efficiency, and EMI profile; RT resistor sets base frequency, MODE/PLLIN enables synchronization. |
| Thermally enhanced 5mm × 7mm QFN | θJA = 34°C/W with proper PCB copper pour; exposed PGND pad must be soldered for thermal and electrical integrity. |
Applications
| ASIC Power Supply | Multi-Rail Server Board |
|---|---|
Use Scenario: Providing tightly regulated 1.2V/15A and 1.5V/15A core voltages to high-performance ASICs in data center accelerators. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller managing independent output rails with differential remote sensing to reject board-level ground bounce. Use Value: ±0.67% VOUT1 regulation and 30ns tON(MIN) enable stable 1.2V delivery from 12V input, minimizing voltage margining and improving power efficiency. | Use Scenario: Generating multiple independent low-voltage rails (e.g., 0.85V CPU, 1.1V memory, 1.8V I/O) on dense server motherboard power delivery networks. IC Role / Device Role / Timing Role: Configured in dual-output mode with independent TRACK/SS pins to sequence rail startup and prevent backfeed during hot-swap events. Use Value: Independent soft-start and voltage tracking ensure controlled power-up sequencing, eliminating latch-up risk in complex multi-rail systems. |
| High-Step-Down Telecom PSU | Industrial FPGA Power System |
Use Scenario: Converting 48V intermediate bus to 3.3V/20A for packet processing units in 5G baseband equipment. IC Role / Device Role / Timing Role: Operated in multiphase single-output mode (TG1+TG2 interleaved) to reduce input/output ripple and improve thermal distribution. Use Value: 180° phase shift between channels cuts RMS input current by ~30%, lowering EMI filter size and conduction losses in high-current 48V→3.3V conversion. | Use Scenario: Delivering 0.6V/30A core voltage to Xilinx Kintex Ultrascale+ FPGAs in programmable logic controllers with extended temperature requirements. IC Role / Device Role / Timing Role: Utilizes DTR feature and differential sensing to maintain regulation during rapid FPGA dynamic power transitions across –40°C to +85°C ambient. Use Value: DTR reduces 0.6V output overshoot from >120mV to <60mV during 20A→0A load dump, preventing FPGA brownout and ensuring deterministic reset behavior. |
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 |
|---|---|---|---|
| LTC3838EUHF-1#TRPBF | Same silicon, rated for 0°C to 85°C operating junction temperature (vs. –40°C to 125°C for LTC3838IUHF-1#TRPBF) | Suitable for commercial-grade computing or networking gear with controlled thermal environments | Select when full industrial temperature range is not required; lower cost and same footprint. |
| MP2918GL-Z | Single-channel controller with integrated MOSFET drivers; lacks dual differential sensing and DTR functionality | Targeted at cost-sensitive, lower-current applications (<12A) without stringent transient response demands | Choose only for simplified single-rail designs where ±1% regulation and basic soft-start suffice. |
Compared with LTC3838EUHF-1#TRPBF and MP2918GL-Z, the LTC3838IUHF-1#TRPBF uniquely combines industrial temperature qualification, dual differential sensing, and DTR-based overshoot suppression-making it the only option for high-reliability, low-voltage, high-transient ASIC/FPGA power delivery.
Availability
LTC3838IUHF-1#TRPBF is available at Aetrix Electronics and suitable for distributed power systems, computing/data storage power supplies, and low-voltage high-current converters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3838IUHF-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 legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification standards.
The LTC3838 family is designed specifically for high-efficiency, high-transient-response, multiphase synchronous buck conversion in demanding applications including ASIC, FPGA, GPU, and telecom infrastructure power supplies.
FAQ
What is the operating temperature range of the LTC3838IUHF-1#TRPBF?
The LTC3838IUHF-1#TRPBF is guaranteed to meet all specifications over a junction temperature range of –40°C to +125°C. This industrial-grade rating is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics notes, making LTC3838IUHF-1#TRPBF suitable for harsh-environment applications such as industrial automation and automotive under-hood systems where ambient temperatures exceed 85°C.
How does the DTR feature in the LTC3838IUHF-1#TRPBF reduce output voltage overshoot?
The DTR feature in the LTC3838IUHF-1#TRPBF monitors load-release transients by sensing voltage drop on the DTR1/DTR2 pins. When the pin voltage falls below half of INTVCC during rapid current decrease, the controller disables the bottom gate driver (BG), allowing inductor current to decay faster and limiting VOUT overshoot-demonstrated in Figure G07/G08 with up to 50% reduction in 0.6V rail overshoot during 15A→0A steps.
Can the LTC3838IUHF-1#TRPBF operate with only one channel enabled?
Yes, the LTC3838IUHF-1#TRPBF supports single-channel operation: pulling RUN2 low disables Channel 2 while Channel 1 remains fully functional with independent regulation, soft-start, and protection. Quiescent current drops from 3mA (both channels) to 2mA (one channel), and ITH2 becomes inactive-enabling flexible design reuse across varying power rail requirements without hardware change.
What is the purpose of the VRNG pin on the LTC3838IUHF-1#TRPBF?
VRNG on the LTC3838IUHF-1#TRPBF selects the maximum current sense threshold: tying VRNG to SGND sets VSENSE(MAX) to 30mV per channel, while connecting it to INTVCC raises the threshold to 60mV. This allows designers to optimize RSENSE value and power loss trade-offs-e.g., 60mV enables use of smaller, lower-loss sense resistors in high-current (>20A) applications.
Does the LTC3838IUHF-1#TRPBF support multiphase operation with external synchronization?
Yes, the LTC3838IUHF-1#TRPBF supports full multiphase operation: MODE/PLLIN accepts external clocks from 200kHz to 2.6MHz (±30% lock range), and PHASMD configures TG2 phase offset (180° or 240°) relative to TG1. CLKOUT can drive other controllers' MODE/PLLIN pins, enabling precise system-wide phase alignment across multiple LTC3838IUHF-1#TRPBF devices in high-current power stacks.
LTC3838IUHF-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)
LTC3838IUHF-1#TRPBF FAQ
1.How can I place an order for LTC3838IUHF-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3838IUHF-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 LTC3838IUHF-1#TRPBF reliable?
The price and inventory of LTC3838IUHF-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 LTC3838IUHF-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3838IUHF-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3838IUHF-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3838IUHF-1#TRPBF?
LTC3838IUHF-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3838IUHF-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 LTC3838IUHF-1#TRPBF?
For technical support, including LTC3838IUHF-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3838IUHF-1#TRPBF requirements.
6.How does Aetrix verify that LTC3838IUHF-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3838IUHF-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 LTC3838IUHF-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3838IUHF-1#TRPBF?
All LTC3838IUHF-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3838IUHF-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 LTC3838IUHF-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3838IUHF-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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