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Analog Devices Inc. LTC3839IUH#PBF
- Part No.:
- LTC3839IUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3839IUH#PBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,485
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Product details
Overview
LTC3839IUH#PBF 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 over temperature with differential sensing, supports 4.5V–38V input and 0.6V–5.5V output, and operates up to 2MHz switching frequency. It is used in high-current point-of-load converters for computing and datacom systems requiring fast transient response and remote sensing.
For engineers reviewing the LTC3839IUH#PBF datasheet, LTC3839IUH#PBF pinout, LTC3839IUH#PBF application, or LTC3839IUH#PBF equivalent, key selection criteria include controlled on-time valley current mode control, DTR-based load-release overshoot suppression, 30ns minimum on-time, differential VOUT sensing tolerance to ±500mV ground offset, and support for RSENSE or DCR current sensing.
Technical Context
The LTC3839IUH#PBF implements a controlled on-time, valley current mode architecture that maintains constant switching frequency independent of VIN, VOUT, and load-enabling predictable EMI behavior and fast transient response. Its dual-phase operation achieves interleaved timing with programmable phase offsets (180°, 240°) via PHASMD pin configuration.
Differential output sensing (VOUTSENSE+ / VOUTSENSE–) enables precise regulation even when remote ground deviates by ±500mV from local SGND. The Detect Transient (DTR) feature monitors rapid load release and disables bottom gate drivers to minimize output overshoot at low-voltage rails like 0.6V or 1.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V - supports wide-input industrial and telecom power rails without external pre-regulation. |
| Output Voltage Range | 0.6V to 5.5V - covers core voltages for CPUs, FPGAs, ASICs, and memory subsystems. |
| Output Regulation Accuracy | ±0.67% over temperature - achieved via precision internal reference and differential feedback, enabling tight margining in high-performance digital loads. |
| Switching Frequency | 200kHz to 2MHz - set by RT resistor or synchronized to external clock; higher frequencies allow smaller magnetics and faster loop bandwidth. |
| tON(MIN) | 30ns - enables near-0% duty cycle operation, critical for high VIN-to-low VOUT conversion (e.g., 38V → 0.6V). |
| tOFF(MIN) | 90ns - supports near-100% duty cycle, essential for low-dropout operation in battery-powered or backup systems. |
| Current Sensing | RSENSE or inductor DCR - flexible sensing method accommodates efficiency-optimized designs with minimal component count or loss. |
Pinout & Package
Thermally enhanced 32-pin (5mm × 5mm) QFN package with exposed PGND pad (Pin 33) requiring solder connection to PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PHASMD (1) | Phase selector input | Sets relative phase between channels (180° or 240°) and CLKOUT phase (60°, 90°, or 120°); determines interleaving alignment for ripple cancellation. |
| MODE/PLLIN (2) | Mode control or sync input | Selects forced continuous/discontinuous mode or accepts external clock for synchronization across multiple controllers. |
| VOUTSENSE+ (8), VOUTSENSE– (9) | Differential output voltage sense inputs | Enable accurate regulation despite up to ±500mV ground potential difference between IC and load; eliminate IR drop error in high-current paths. |
| SENSE1+/SENSE2+ (10,31), SENSE1–/SENSE2– (11,30) | Differential current sense inputs | Support Kelvin RSENSE or RC-filtered DCR sensing; internal 500kΩ resistor on SENSE– pins simplifies DCR implementation. |
| DTR (12) | Load-release transient detector | Triggers bottom-FET turn-off during sudden load reduction to suppress VOUT overshoot-critical for sub-1.2V CPU cores. |
| PGOOD (13) | Open-drain power-good indicator | Signals valid regulation within ±7.5% window after 50µs fault delay; includes 2% hysteresis to prevent chatter during marginal conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Differential output voltage sensing | Enables ±0.67% regulation accuracy despite ±500mV ground offset between controller and load-eliminates need for separate remote-sense routing in dense PCB layouts. |
| Controlled on-time valley current mode | Delivers constant-frequency operation independent of input/output voltage and load-simplifies EMI filtering and improves loop stability across operating conditions. |
| Detect Transient (DTR) function | Reduces output overshoot by up to 50% during rapid load release (e.g., 30A→0A), verified in typical applications at 1.2V/30A with 50µs recovery. |
| Programmable current sense range | VRNG pin scales max sense voltage from 30mV to 100mV (20× VRNG), allowing optimization of RSENSE value for accuracy vs. conduction loss trade-offs. |
| 2-phase interleaved operation | Halves input/output ripple current vs. single-phase design-reduces required input capacitance by ~50% and eases thermal management in high-power PoL converters. |
Applications
| Server CPU Core Power | FPGA I/O Bank Supply |
|---|---|
|
Use Scenario: Delivering 1.2V/30A to high-performance server CPUs with dynamic load steps up to 30A/µs. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing top/bottom N-MOSFETs per phase with valley current mode control and DTR-enabled overshoot suppression. Use Value: Maintains <±15mV output deviation during 30A load transients and supports 2MHz switching to minimize output capacitor count and board area. |
Use Scenario: Providing tightly regulated 1.8V/20A to FPGA I/O banks with strict voltage tracking requirements relative to core supply. IC Role / Device Role / Timing Role: Single-output, 2-phase controller using TRACK/SS pin to synchronize startup ramp with core rail and differential sensing to reject ground noise from adjacent high-speed logic. Use Value: Achieves ±0.67% regulation accuracy and supports voltage tracking with <1% mismatch across temperature, ensuring signal integrity in multi-rail FPGA systems. |
| Telecom Baseband Processor | Industrial PLC Digital I/O Module |
|
Use Scenario: Generating 0.85V/25A for 5G baseband processors operating from 48V intermediate bus with strict EMI limits. IC Role / Device Role / Timing Role: High-frequency (1.5MHz) 2-phase buck controller using external clock synchronization (via MODE/PLLIN) to align switching edges with system timing reference and reduce conducted emissions. Use Value: Enables compliance with EN55022 Class B EMI limits through deterministic switching frequency and interleaved ripple cancellation. |
Use Scenario: Powering isolated digital I/O circuits in harsh industrial environments where input voltage varies from 24V to 36V and load steps occur during relay switching. IC Role / Device Role / Timing Role: Robust 2-phase controller with 4.5V–38V input range, UVLO hysteresis, and overvoltage protection-operating in forced continuous mode to avoid discontinuous-mode instability under variable loads. Use Value: Ensures uninterrupted operation during brownouts and prevents damage from inductive kickback via PGOOD monitoring and OVP clamping. |
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#PBF | Dual-output capable (single or dual); Channel 2 has ±1% regulation vs. LTC3839's ±0.67% on single output; no DTR feature. | Preferred when dual independent outputs are needed (e.g., core + I/O), but less suitable for ultra-tight regulation or aggressive load-release scenarios. | Choose LTC3839IUH#PBF when single-output precision, DTR, or lower VOUT overshot is mandatory; choose LTC3838IUH#PBF only if dual-rail flexibility outweighs regulation accuracy loss. |
| MP2918GL-Z | Monolithic 2-phase controller (integrated MOSFETs); fixed 0.6V reference; no differential sensing or DTR; max 16V input. | Targeted at cost-sensitive, space-constrained applications below 12V input; lacks remote sensing and advanced transient mitigation. | Use MP2918GL-Z only for ≤12V, ≤20A applications where board space and BOM count are prioritized over regulation accuracy and transient robustness. |
Compared with LTC3838IUH#PBF and MP2918GL-Z, the LTC3839IUH#PBF uniquely combines ±0.67% differential regulation, DTR-based overshoot control, and 38V input capability-making it the only option qualified for high-accuracy, high-transient, wide-input industrial and telecom PoL designs.
Availability
LTC3839IUH#PBF is available at Aetrix Electronics and suitable for distributed power systems, point-of-load converters, and computing systems requiring stable component supply, long-term lifecycle assurance, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LTC3839IUH#PBF 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, manufacturing, and documentation for the LTC® portfolio. Linear Technology pioneered high-performance analog power management ICs with emphasis on precision, speed, and reliability.
The LTC3839IUH#PBF belongs to Linear's PolyPhase® synchronous buck controller family, designed specifically for high-current, low-voltage point-of-load regulation in servers, networking equipment, and FPGA/ASIC power systems demanding fast transient response and remote sensing.
FAQ
What is the operating temperature range for the LTC3839IUH#PBF?
The LTC3839IUH#PBF is specified for operation from –40°C to +125°C junction temperature. It is qualified and guaranteed across this full range, unlike the E-grade version (LTC3839EUH#PBF), which is rated only from 0°C to 85°C. Thermal design must ensure θJA ≤ 44°C/W to maintain TJ ≤ 125°C under maximum power dissipation.
Does the LTC3839IUH#PBF support both RSENSE and inductor DCR current sensing?
Yes, the LTC3839IUH#PBF supports both methods. SENSE+ and SENSE– pins accept differential inputs for either Kelvin-connected shunt resistors or RC-filtered DCR networks. Internal 500kΩ resistors from SENSE– to SGND simplify DCR biasing, and VRNG pin scaling allows optimal sense voltage selection (30mV–100mV) for each method.
How does the DTR (Detect Transient) feature work in the LTC3839IUH#PBF?
The DTR pin (Pin 12) monitors load-release events: when its voltage drops below half of INTVCC during rapid current decrease, the LTC3839IUH#PBF disables bottom gate drivers to accelerate inductor current decay and suppress VOUT overshoot. An internal 5µA pull-up keeps DTR active; tie to INTVCC to disable the feature.
Can the LTC3839IUH#PBF be synchronized to an external clock?
Yes. Applying a clock signal to the MODE/PLLIN pin (Pin 2) synchronizes both phases to that source. The external clock must be within ±30% of the frequency set by the RT resistor to achieve lock. CLKOUT (Pin 3) can then drive other controllers' MODE/PLLIN pins for system-wide timing alignment.
What is the purpose of the VOUTSENSE+ and VOUTSENSE– pins on the LTC3839IUH#PBF?
VOUTSENSE+ and VOUTSENSE– provide differential feedback to the error amplifier, enabling regulation referenced to the actual load terminals-not the IC's local ground. This compensates for up to ±500mV ground potential difference between controller and load, delivering ±0.67% accuracy even with high IR drops in PCB planes or connectors.
LTC3839IUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3839IUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3839IUH#PBF 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#PBF reliable?
The price and inventory of LTC3839IUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3839IUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3839IUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3839IUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3839IUH#PBF?
LTC3839IUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3839IUH#PBF 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#PBF?
For technical support, including LTC3839IUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3839IUH#PBF requirements.
6.How does Aetrix verify that LTC3839IUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3839IUH#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3839IUH#PBF?
All LTC3839IUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3839IUH#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3839IUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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