My Inquiry
My Account
Analog Devices Inc. LTC3838IFE#TRPBF
- Part No.:
- LTC3838IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3838IFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,781
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3838IFE#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, PolyPhase® synchronous step-down DC/DC controller with differential output voltage sensing on Channel 1 and independent regulation on Channel 2. It supports input voltages from 4.5V to 38V, delivers regulated outputs from 0.6V to 5.5V, achieves ±0.67% output accuracy on Channel 1 over temperature, and features 30ns minimum on-time for high VIN-to-low VOUT conversion in computing and point-of-load applications.
For engineers reviewing the LTC3838IFE#TRPBF datasheet, LTC3838IFE#TRPBF pinout, LTC3838IFE#TRPBF application, or LTC3838IFE#TRPBF equivalent, key selection criteria include differential remote-sense capability (±500mV ground offset tolerance), valley current mode control with load-release transient detection (DTR), programmable 200kHz–2MHz switching frequency, and compatibility with RSENSE or DCR current sensing in thermally constrained TSSOP-38 layouts.
Technical Context
The LTC3838IFE#TRPBF implements controlled-on-time, valley current mode control across two independent channels-enabling fast transient response while maintaining constant-frequency operation regardless of VIN, VOUT, or load. Its differential sensing architecture on Channel 1 uses internal precision reference and dedicated VOUTSENSE1+/– inputs to reject common-mode ground noise up to ±500mV.
Channel 2 operates as either an independent ±1% regulator or a phase-synchronized PolyPhase partner via PHASMD-selectable 180°/240° phase shift. The controller integrates dual gate drivers (TG/BG), programmable current sense range (via VRNG pins), and DTR circuitry that actively disables BG during rapid load release to suppress overshoot-particularly critical at low-output-voltage, high-current rails like 1.2V/15A CPU cores.
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 - enables precise regulation despite PCB ground bounce or remote load placement. |
| Min On-Time / Off-Time | 30ns / 90ns - allows stable 0.6V output from 38V input at high duty-cycle ratios. |
| Switching Frequency Range | 200kHz to 2MHz (resistor-programmed or external clock sync) - balances efficiency vs. size for compact POL designs. |
| Current Sensing Options | RSENSE or inductor DCR - eliminates need for dedicated sense resistors, reducing power loss and BOM cost. |
| Thermal Rating | –40°C to +125°C junction - qualified for automotive under-hood and industrial embedded environments. |
| Package | 38-lead TSSOP (FE) with exposed PGND pad - provides robust thermal dissipation in space-constrained layouts. |
Pinout & Package
Package: 38-lead plastic TSSOP (FE), 12.5mm × 6.1mm × 1.0mm, exposed thermal pad (Pin 39 = PGND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUTSENSE1+, VOUTSENSE1– | Differential feedback inputs (Ch1) | Enable ±500mV remote ground offset compensation - critical for accurate regulation at distributed loads. |
| SENSE1+, SENSE1– / SENSE2+, SENSE2– | Valley current sense inputs | Support Kelvin RSENSE or DCR sensing; SENSE– pins include 500kΩ internal resistor to SGND for bias stability. |
| DTR1, DTR2 | Load-release transient detection | When pulled below INTVCC/2, forces BG off to accelerate inductor current decay and minimize VOUT overshoot. |
| PHASMD | Phase configuration control | Selects TG2 phase relative to TG1: 180° (SGND), 240° (INTVCC), or 180°/CLKOUT=90° (floating) - enables interleaved PolyPhase operation. |
| TRACK/SS1, TRACK/SS2 | Soft-start & voltage tracking | Internal 1µA pull-up enables capacitor-ramped startup; external voltage source enables coordinated sequencing with other rails. |
Key Features
| Feature | Design Value |
|---|---|
| Differential Output Sensing (Ch1) | Rejects up to ±500mV ground potential difference between local and remote output - ensures accuracy in multi-layer PCBs with split grounds. |
| Load-Release Transient Detection (DTR) | Reduces output overshoot by >50% during sudden load drops (e.g., CPU core sleep transitions) without requiring external circuitry. |
| Programmable Current Sense Range | VRNG1/VRNG2 pins set max sense voltage from 30mV to 100mV - optimizes signal-to-noise ratio across 5A–60A output ranges. |
| Controlled-On-Time Valley Current Mode | Delivers <10µs load-step response time while maintaining fixed frequency - simplifies EMI filtering vs. variable-frequency architectures. |
| Independent Dual-Channel Operation | Each channel has dedicated RUN, PGOOD, TRACK/SS, and ITH pins - supports asymmetric rail sequencing and fault isolation in multi-rail systems. |
Applications
| Server CPU Core Power | Telecom Point-of-Load |
|---|---|
Use Scenario: Delivering 1.2V/15A to high-performance x86 CPU cores with dynamic load steps up to 15A/µs. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller managing parallel phases with differential sensing to compensate for package and PCB IR drop. Use Value: ±0.67% regulation accuracy and 30ns min on-time enable stable sub-1.2V operation from 12V intermediate bus, while DTR minimizes overshoot during C-state transitions. | Use Scenario: Generating isolated 3.3V and 5V rails from a 48V backplane in packet-switching line cards. IC Role / Device Role / Timing Role: Dual-controller providing independent, sequenced outputs with programmable soft-start and PGOOD monitoring per rail. Use Value: Wide 4.5V–38V input range accepts derated 48V distribution; TSSOP package fits dense line-card layouts; ±1% Channel 2 accuracy meets telecom LDO-replacement specs. |
| Industrial FPGA Power | Automotive ADAS Domain Controller |
Use Scenario: Supplying 0.85V core and 1.8V I/O rails to Xilinx Kintex Ultrascale+ FPGAs in factory automation PLCs. IC Role / Device Role / Timing Role: Dual-phase controller operating in forced continuous mode (MODE/PLLIN = INTVCC) for low-noise, ripple-sensitive logic supplies. Use Value: Differential sensing maintains accuracy despite FPGA VCCINT ground bounce; –40°C to +125°C rating ensures reliability in uncooled enclosures. | Use Scenario: Powering vision processor SoCs (e.g., NVIDIA Orin) in autonomous driving ECUs with strict ASIL-B compliance requirements. IC Role / Device Role / Timing Role: Primary POL controller with independent PGOOD1/PGOOD2 outputs feeding system safety monitor, and UV/OV protection with 2% hysteresis. Use Value: Dual-channel fault isolation prevents single-point failure; EXTVCC switchover (4.4V–4.8V) enables seamless transition between battery and DC-DC sources during cold-crank events. |
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 (30mV/60mV); improved current limit accuracy. | Required where Channel 2 also demands differential remote sensing (e.g., dual-remote-load systems). | Select LTC3838-1 only if Channel 2 must match Channel 1's differential sensing capability and tighter current limit tolerance is needed. |
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFET drivers; no differential sensing; max 16V input; ±1.5% output accuracy. | Suitable for cost-sensitive, lower-power (<10A) applications where remote sensing and ultra-high accuracy are not required. | Choose MP2918GL-Z for simplified layout and lower BoM count in non-critical 5V/3.3V POL rails - but not for 0.6V–1.2V high-accuracy CPU/FPGA rails. |
Compared with LTC3838-1, the LTC3838IFE#TRPBF trades dual-channel differential sensing for greater flexibility in mixed-accuracy configurations (e.g., precision core + standard I/O rail), while versus MP2918GL-Z it delivers superior accuracy, wider input range, and design scalability for high-current, noise-sensitive applications.
Availability
LTC3838IFE#TRPBF is available at Aetrix Electronics and suitable for server CPU core power, telecom point-of-load converters, and industrial FPGA power systems requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to +125°C.
Supply support for LTC3838IFE#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 analog and power management portfolio with rigorous qualification standards.
The LTC3838IFE#TRPBF belongs to Linear's PolyPhase® controller family, engineered for high-efficiency, high-density DC/DC conversion in computing, datacom, and industrial systems demanding precision regulation and fast transient response.
FAQ
What is the maximum allowable ground offset between VOUTSENSE1– and local SGND for LTC3838IFE#TRPBF?
The LTC3838IFE#TRPBF supports up to ±500mV common-mode ground offset between VOUTSENSE1– and local SGND while maintaining ±0.67% output voltage accuracy on Channel 1. This is enabled by its differential amplifier architecture and precision internal reference, making it suitable for applications with significant PCB ground plane IR drop or remote load placement.
Does LTC3838IFE#TRPBF support both RSENSE and inductor DCR current sensing?
Yes, LTC3838IFE#TRPBF supports both methods. SENSE1+/– and SENSE2+/– inputs accept Kelvin-connected shunt resistors or DCR-based networks (with external RC filter). The VRNG1/VRNG2 pins configure the full-scale sense voltage range from 30mV to 100mV, allowing optimization for either technique across varying current levels and accuracy requirements.
How does the DTR (Detect Transient) feature reduce overshoot in LTC3838IFE#TRPBF?
The DTR feature in LTC3838IFE#TRPBF monitors load-release transients via dedicated DTR1/DTR2 pins. When the pin voltage falls below half of INTVCC during rapid current decrease, the controller immediately disables the bottom gate (BG), allowing inductor current to decay faster through freewheeling - cutting VOUT overshoot by up to 60% compared to standard valley current mode operation.
What is the purpose of the PHASMD pin on LTC3838IFE#TRPBF?
The PHASMD pin on LTC3838IFE#TRPBF selects the phase relationship between Channel 1 and Channel 2. Pulling it to SGND sets TG2 at 180° relative to TG1; connecting to INTVCC sets 240°; leaving it floating defaults to 180° with CLKOUT at 90°. This enables flexible PolyPhase interleaving to reduce input/output ripple and improve thermal distribution in high-current designs.
Can LTC3838IFE#TRPBF operate with only one channel enabled?
Yes, LTC3838IFE#TRPBF supports independent channel control. Driving RUN1 low disables Channel 1 while keeping Channel 2 active (and vice versa). Quiescent current drops to ~2mA when only one channel operates, and full functionality-including PGOOD, TRACK/SS, and ITH-is retained per active channel, enabling asymmetric multi-rail power sequencing.
LTC3838IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LTC3838IFE#TRPBF FAQ
1.How can I place an order for LTC3838IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3838IFE#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 LTC3838IFE#TRPBF reliable?
The price and inventory of LTC3838IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3838IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3838IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3838IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3838IFE#TRPBF?
LTC3838IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3838IFE#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 LTC3838IFE#TRPBF?
For technical support, including LTC3838IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3838IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3838IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3838IFE#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 LTC3838IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3838IFE#TRPBF?
All LTC3838IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3838IFE#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 LTC3838IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3838IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3838IFE#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
