My Inquiry
My Account
Analog Devices Inc. LTC3839IUH#TRPBF
- Part No.:
- LTC3839IUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3839IUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,147
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3839IUH#TRPBF from Analog Devices (formerly Linear Technology) is a 2-phase, single-output synchronous step-down DC/DC controller driving all-N-channel MOSFETs. It delivers ±0.67% output voltage accuracy via differential sensing, supports 0.6V–5.5V output at up to 25A with 2MHz switching, and features load-release transient detection for overshoot suppression in low-voltage point-of-load applications.
For engineers reviewing the LTC3839IUH#TRPBF datasheet, LTC3839IUH#TRPBF pinout, LTC3839IUH#TRPBF application, or LTC3839IUH#TRPBF equivalent, key selection criteria include its controlled on-time valley current mode architecture, 30ns minimum on-time, differential remote sensing capability (±500mV ground offset tolerance), and phase-configurable PolyPhase® operation for high-current computing and telecom power rails.
Technical Context
The LTC3839IUH#TRPBF implements a controlled on-time, valley current mode control loop with dual independent gate drivers (TG1/BG1 and TG2/BG2), enabling fast transient response and constant-frequency operation independent of input voltage, output voltage, or load. Its DTR (Detect Transient Release) circuit monitors the DTR pin voltage relative to 0.5×INTVCC to dynamically disable bottom FETs during rapid load release, minimizing VOUT overshoot.
Differential output sensing (VOUTSENSE+ and VOUTSENSE–) feeds into a precision error amplifier with 1.7mS transconductance and 0.6V reference, while VRNG-programmable current sense range (30mV–100mV) supports both RSENSE and DCR sensing. Phase alignment (0°/180°/240°) and CLKOUT synchronization are configured via PHASMD and MODE/PLLIN pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V - supports wide-input industrial and telecom power buses without pre-regulation. |
| Output Voltage Range | 0.6V to 5.5V - enables direct regulation of core voltages (e.g., 1.2V CPU, 3.3V I/O) with ±0.67% accuracy over temperature. |
| Switching Frequency | 200kHz to 2MHz - programmable via RT resistor or synchronizable to external clock for EMI reduction and multi-controller coordination. |
| Min On/Off Time | tON(MIN) = 30ns, tOFF(MIN) = 90ns - enables near 0% and near 100% duty cycles for ultra-low-VOUT (e.g., 0.6V) or high-VIN-to-VOUT ratios. |
| Current Sense Range | 30mV to 100mV (VRNG-selectable) - provides flexible, accurate valley current monitoring for RSENSE or DCR-based designs. |
| Thermal Rating | –40°C to +125°C junction - qualified for automotive under-hood and industrial embedded environments with θJA = 44°C/W. |
| Package | 32-pin (5mm × 5mm) QFN with exposed PGND pad - optimized for thermal dissipation and compact high-density PCB layouts. |
Pinout & Package
32-lead (5mm × 5mm) plastic QFN package with exposed thermal pad (Pin 33) electrically connected to PGND and requiring soldering to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PHASMD (1) | Phase configuration input | Selects channel 2 phase offset (180°/180°/240°) and CLKOUT phase (60°/90°/120°) relative to channel 1. |
| MODE/PLLIN (2) | Mode control or sync input | Configures forced continuous/discontinuous mode or accepts external clock for synchronization. |
| CLKOUT (3) | Internal clock output | Provides synchronized clock signal for daisy-chaining multiple controllers or timing-critical peripherals. |
| SGND (4, 29) | Signal ground reference | Reference for analog circuitry, compensation network, and feedback divider - must be tied to exposed PGND pad. |
| RT (5) | Frequency programming node | Resistor-to-SGND sets switching frequency; floating defaults to ~200kHz. |
| ITH (6) | Error amplifier output / compensation node | Controls current limit threshold; voltage range 0–2.4V maps to 0–100mV sense voltage. |
| TRACK/SS (7) | Soft-start and tracking input | Internal 1µA pull-up enables capacitor-based ramp; external voltage allows output tracking of another rail. |
| VOUTSENSE+ (8) | Differential output sense (+) | Connects to positive terminal of output capacitor - enables remote sensing across PCB trace resistance. |
| VOUTSENSE– (9) | Differential output sense (–) | Connects to negative terminal of output capacitor - tolerates ±500mV common-mode offset vs local SGND. |
| SENSE1+/SENSE2+ (10, 31) | Current sense (+) inputs | Kelvin-connected to RSENSE or DCR sense nodes - rejects noise and improves current measurement fidelity. |
| SENSE1–/SENSE2– (11, 30) | Current sense (–) inputs | Internally biased to SGND via 500kΩ - used with SENSE+ for differential valley current detection. |
| DTR (12) | Load-release transient detector | Triggers BG shutdown when voltage drops below 0.5×INTVCC, reducing VOUT overshoot during sudden load removal. |
| PGOOD (13) | Power-good open-drain output | Asserts low when VOUT deviates >±7.5% from target, with 50µs fault delay and 20µs recovery delay. |
| BOOST1/BOOST2 (14, 27) | Floating top-gate supplies | Drive bootstrap capacitors for high-side N-MOSFETs - swing between DRVCC–VF and VIN+DRVCC–VF. |
| TG1/TG2 (15, 26) | Top gate drivers | Drive gates of high-side N-MOSFETs with VDRVCC swing referenced to BOOST pins. |
| SW1/SW2 (16, 25) | Switch node connections | Connect to inductor high-side terminals - experience full VIN-to-GND voltage swing. |
| BG1/BG2 (17, 24) | Bottom gate drivers | Drive gates of low-side N-MOSFETs between PGND and DRVCC - enable synchronous rectification. |
| DRVCC1/DRVCC2 (18, 23) | Gate driver supplies | DRVCC1 is internal 5.3V LDO output; DRVCC2 switches between internal LDO and EXTVCC above 4.6V. |
| VIN (19) | Main input supply | Primary power source (4.5–38V); also used for on-time adjustment - requires RC filtering for noise immunity. |
| PGND (20, 33) | Power ground return | High-current return path for bottom FETs, CIN, and CDRVCC - exposed pad must be soldered for thermal performance. |
| INTVCC (21) | Internal bias supply | Powered from DRVCC via RC filter; supplies analog circuitry except gate drivers - UVLO at 3.7V. |
| EXTVCC (22) | External auxiliary supply | Optional 4.5–5.5V input that disables internal LDO when >4.6V, improving efficiency at high loads. |
| RUN (28) | Enable/disable control | PTAT pull-up (~2.5µA) enables startup at ~1.2V; sinking <100µA forces shutdown with micropower (<15µA) quiescent current. |
| VRNG (32) | Current sense range select | Voltage (0.6–2V) sets max sense voltage: 30mV (SGND), 50mV (INTVCC), or 100mV (2V) - 20× scaling ratio. |
Key Features
| Feature | Design Value |
|---|---|
| Differential output voltage sensing | Enables ±0.67% regulation accuracy even with ±500mV ground potential difference between local IC ground and remote load ground. |
| Controlled on-time valley current mode | Delivers fast transient response and stable constant-frequency operation across full VIN/VOUT/load range without slope compensation. |
| Load-release transient detection (DTR) | Reduces output overshoot by up to 50% during rapid load removal - critical for sub-1V microprocessor rails. |
| Programmable 2-phase PolyPhase® operation | Supports 180° or 240° interleaving to halve input/output ripple current and reduce required capacitance by >50%. |
| Flexible current sensing architecture | Supports both precision RSENSE (Kelvin) and cost-effective DCR sensing with VRNG-adjustable gain and 30mV–100mV range. |
| Robust protection suite | Includes overvoltage/undervoltage PGOOD monitoring, current limit foldback, short-circuit protection, and thermal shutdown. |
Applications
| Server VRM Core Power | Telecom Point-of-Load |
|---|---|
Use Scenario: Regulating 1.2V/25A CPU core voltage in dual-socket server motherboards with tight transient requirements. IC Role / Device Role / Timing Role: 2-phase synchronous buck controller managing parallel high-current power stages with interleaved switching. Use Value: 30ns minimum on-time enables precise 1.2V regulation; DTR feature suppresses overshoot during CPU C-state transitions. |
Use Scenario: Generating 3.3V/20A for FPGA I/O banks in 5G base station line cards with strict EMI limits. IC Role / Device Role / Timing Role: Single-output PolyPhase® controller operating at 2MHz with external clock synchronization to avoid band interference. Use Value: 2MHz switching reduces output capacitor count; differential sensing maintains accuracy despite board-level ground bounce. |
| Industrial PLC Power Supply | Automotive ADAS Domain Controller |
Use Scenario: Providing 5V/15A system rail in programmable logic controller with 24V nominal input and wide temperature variation. IC Role / Device Role / Timing Role: Wide-input buck controller supporting 4.5–38V operation with integrated 5.3V LDO for gate drivers and bias. Use Value: –40°C to +125°C qualification ensures reliability; VRNG-selectable current sense accommodates aging DCR drift. |
Use Scenario: Delivering 1.0V/18A to AI accelerator SoC in autonomous driving domain controller with functional safety constraints. IC Role / Device Role / Timing Role: High-accuracy controller with PGOOD monitoring, overvoltage protection, and robust thermal management. Use Value: ±0.67% output accuracy meets ASIL-B voltage tolerance; exposed-pad QFN aids thermal dissipation in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3838IUH#TRPBF | Dual-output capable; Channel 2 has ±1% regulation (vs. LTC3839's single-output ±0.67%); no DTR feature. | Suitable for dual-rail systems (e.g., 1.2V + 3.3V), but lacks load-release overshoot suppression needed for low-VOUT cores. | Select LTC3838 when dual independent outputs are required and DTR is not critical. |
| MP2964GL-Z | Monolithic 2-phase controller (integrated MOSFETs); fixed 0.6V reference; no differential sensing or VRNG programmability. | Lower BOM count for <10A applications, but limited to 12V max input and lacks remote sensing for high-accuracy loads. | Choose MP2964 for space-constrained, lower-power designs where integrated FETs and simplicity outweigh accuracy needs. |
Compared with LTC3838IUH#TRPBF and MP2964GL-Z, the LTC3839IUH#TRPBF uniquely combines differential remote sensing, DTR-enabled overshoot control, and VRNG-programmable current sense - making it optimal for high-accuracy, high-current, low-voltage point-of-load applications where layout-induced ground offsets and transient response are critical.
Availability
LTC3839IUH#TRPBF is available at Aetrix Electronics and suitable for server VRMs, telecom power modules, industrial PLCs, and automotive ADAS domain controllers requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to +125°C.
Supply support for LTC3839IUH#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, emphasizing precision, efficiency, and reliability in analog and mixed-signal ICs.
The LTC3839IUH#TRPBF belongs to Linear's PolyPhase® synchronous buck controller family, designed specifically for high-current, low-voltage point-of-load regulation in computing, networking, and industrial systems demanding fast transient response and exceptional output accuracy.
FAQ
What is the minimum output voltage supported by the LTC3839IUH#TRPBF?
The LTC3839IUH#TRPBF supports regulated output voltages as low as 0.6V, enabled by its 30ns minimum on-time and precision 0.6V internal reference. This allows direct generation of modern processor core voltages without external resistive dividers that degrade accuracy. The differential sensing architecture maintains ±0.67% regulation even at 0.6V under full load and temperature extremes.
How does the DTR (Detect Transient Release) feature work in the LTC3839IUH#TRPBF?
The DTR feature in the LTC3839IUH#TRPBF monitors the voltage on the DTR pin relative to 0.5×INTVCC. During rapid load release, if the DTR pin voltage falls below this threshold, the controller disables the bottom gate drivers (BG1/BG2), allowing inductor current to decay faster and significantly reducing output voltage overshoot - especially critical for sub-1V rails. The feature is disabled by tying DTR to INTVCC.
Can the LTC3839IUH#TRPBF operate with only one phase active?
Yes, the LTC3839IUH#TRPBF can operate in single-phase mode by configuring PHASMD and MODE/PLLIN appropriately and leaving one set of gate drive signals unused. However, its control architecture and current sensing are optimized for balanced 2-phase operation. For true single-phase applications, Linear's LTC3855 or LTC3880 may offer better integration and parameter optimization.
What is the purpose of the VRNG pin on the LTC3839IUH#TRPBF?
The VRNG pin on the LTC3839IUH#TRPBF sets the maximum allowable valley current sense voltage (VSENSE+ – VSENSE–) for both channels. Applying 0.6V–2V to VRNG scales the sense range linearly: 0.6V → 30mV, 1V → 50mV, 2V → 100mV. This allows designers to optimize signal-to-noise ratio and accuracy for either RSENSE or DCR current sensing topologies without changing external components.
Does the LTC3839IUH#TRPBF require an external clock to achieve 2MHz operation?
No, the LTC3839IUH#TRPBF achieves 2MHz operation using only the RT pin - a resistor from RT to SGND sets the internal oscillator frequency. An external clock applied to MODE/PLLIN is optional and used for synchronization across multiple controllers or EMI shaping. At 2MHz, the device maintains full functionality including DTR, differential sensing, and current mode control.
LTC3839IUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 32-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:
- 32-QFN (5x5)
LTC3839IUH#TRPBF FAQ
1.How can I place an order for LTC3839IUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3839IUH#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 LTC3839IUH#TRPBF reliable?
The price and inventory of LTC3839IUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3839IUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3839IUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3839IUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3839IUH#TRPBF?
LTC3839IUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3839IUH#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 LTC3839IUH#TRPBF?
For technical support, including LTC3839IUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3839IUH#TRPBF requirements.
6.How does Aetrix verify that LTC3839IUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3839IUH#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 LTC3839IUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3839IUH#TRPBF?
All LTC3839IUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3839IUH#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 LTC3839IUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3839IUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3839IUH#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…
