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Analog Devices Inc. LTC3836EUFD#PBF
- Part No.:
- LTC3836EUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3836EUFD#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:146
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Product details
Overview
LTC3836EUFD#PBF from Analog Devices (formerly Linear Technology) is a dual-output, 2-phase synchronous step-down controller driving external N-channel MOSFETs for high-efficiency DC/DC conversion in space-constrained systems. It operates from 2.75V to 4.5V input, delivers up to 15A per output, features no-RSENSE current sensing via VDS, 97% duty cycle for low-dropout operation, and supports out-of-phase interleaving to minimize input capacitance requirements - ideal for single Li-ion powered embedded systems and distributed power rails.
For engineers reviewing the LTC3836EUFD#PBF datasheet, LTC3836EUFD#PBF pinout, LTC3836EUFD#PBF application, or LTC3836EUFD#PBF equivalent, key selection considerations include its dual 2-phase architecture with tracking, selectable 300–750kHz switching frequency, internal 1ms soft-start with external extension capability, and true PLL-based synchronization for noise-sensitive multi-rail designs.
Technical Context
The LTC3836EUFD#PBF implements constant-frequency current-mode control using MOSFET VDS sensing instead of discrete sense resistors, eliminating associated power loss and noise. Its two controllers operate 180° out-of-phase to reduce RMS input ripple current by up to 50%, enabling smaller input capacitors and lower EMI.
It integrates independent ITH pins for per-channel current threshold programming, PLLLPF pin for frequency selection or PLL loop filtering, and TRACK/SS2 pin enabling precise voltage tracking between outputs during startup. Pulse-skipping or forced continuous mode is selected via SYNC/FCB, while overvoltage protection triggers at +13.3% deviation from 0.6V reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.75V to 4.5V - supports single-cell Li-ion and regulated 3.3V input rails without pre-regulation. |
| Feedback Reference | 0.6V ±1.5% - enables accurate output regulation down to 0.6V with tight tolerance across –40°C to 85°C. |
| Switching Frequency | 300kHz to 750kHz (selectable); 250kHz to 850kHz (PLL-synchronized) - balances efficiency vs. component size and EMI compliance. |
| Duty Cycle Max | 97% - sustains regulation under low-input/high-output conditions, extending battery runtime in dropout scenarios. |
| Quiescent Current | 6.5μA in shutdown - minimizes standby power loss in always-on portable systems. |
| Current Sense Method | No external RSENSE; uses VDS of main MOSFET - eliminates sense resistor losses and PCB area, improving full-load efficiency. |
| Package | 28-lead (4mm × 5mm) QFN with exposed thermal pad - provides low θJA = 43°C/W for high-current dual-phase operation in compact layouts. |
Pinout & Package
Package: 28-lead (4mm × 5mm) plastic QFN (UFD), thermally enhanced with exposed pad soldered to PCB ground (Pin 29). Pin count and layout match GN (SSOP) variant but with superior thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 / SW2 | Switch Node | Connection point for inductor and external MOSFET sources/drains; serves as negative input to current comparator and reverse-current detector. |
| VFB1 / VFB2 | Feedback Input | Receives scaled output voltage from external resistor divider; compared to 0.6V reference to regulate each output independently. |
| ITH1 / ITH2 | Error Amplifier Output / Current Threshold | Sets peak inductor current limit per channel; nominal operating range 0.7V–2.0V determines current comparator trip point. |
| TG1 / TG2 | Top Gate Drive | Drives gates of external high-side N-MOSFETs with swing from PGND to BOOST voltage; rise/fall time ≤40ns (CL = 3000pF). |
| BG1 / BG2 | Bottom Gate Drive | Drives gates of external synchronous low-side N-MOSFETs; swing from PGND to BOOST; rise/fall time ≤50ns (CL = 3000pF). |
| RUN/SS | Enable & External Soft-Start | Pulling below 0.65V disables both channels; internal 0.65μA current source charges external capacitor for programmable soft-start ramp. |
| TRACK/SS2 | Output 2 Tracking Input | Regulates VOUT2 to track voltage on this pin during startup; internal 1μA pull-up enables capacitor-based ramp or resistor-divider tracking. |
| SYNC/FCB | PLL Sync Input / Mode Select | Accepts external clock (250–850kHz) for phase locking; tied to VIN for pulse-skipping, to SGND for forced continuous conduction. |
| PLLLPF | Frequency Set / PLL Filter | Floating = 550kHz; tied to SGND = 300kHz; tied to VIN = 750kHz; when PLL active, forms RC loop filter with external components. |
| PGOOD | Power-Good Monitor | Open-drain output pulled low if either VFB deviates >±13.3% from 0.6V or device is in shutdown/UVLO. |
Key Features
| Feature | Design Value |
|---|---|
| 2-Phase Interleaved Operation | Reduces input RMS current by ~50% versus single-phase, cutting required input capacitance and EMI filter size. |
| No RSENSE Current Sensing | Eliminates power loss and board area of sense resistors; uses main MOSFET's RDS(ON) for current detection. |
| True PLL Synchronization | Locks internal oscillator to external clock (250–850kHz) with guaranteed capture range, enabling deterministic timing in multi-converter systems. |
| Independent Per-Channel IPRG Pins | Selects max current sense voltage (82mV/122mV/202mV) per output to optimize MOSFET selection and transient response. |
| Tracking Start-Up with Dual Soft-Start | Enables controlled sequencing: VOUT1 ramps via RUN/SS; VOUT2 tracks via TRACK/SS2 - prevents backfeed and ensures monotonic startup. |
| Output Overvoltage Protection | Hardware-level OVP trips at +13.3% above 0.6V reference, forcing synchronous rectification to clamp overshoot before damage occurs. |
Applications
| Mobile Application Processor Power | Industrial FPGA Core Supply |
|---|---|
Use Scenario: Powering dual-voltage rails (e.g., 1.8V I/O + 1.2V core) for ARM-based SoCs in handheld medical devices. IC Role / Device Role / Timing Role: Dual 2-phase controller providing tightly regulated, tracked outputs with fast transient response and low noise. Use Value: Out-of-phase operation reduces input ripple by 50%, allowing smaller ceramic input caps and meeting stringent EMI limits in portable enclosures. |
Use Scenario: Generating 1.2V and 1.8V supplies for Xilinx Artix-7 FPGA banks with strict sequencing and voltage accuracy. IC Role / Device Role / Timing Role: Dual-output controller with independent feedback and tracking function ensuring monotonic startup and rail-to-rail margining. Use Value: Internal 0.6V reference ±1.5% and PGOOD monitoring enable reliable power-good assertion for FPGA configuration logic. |
| Battery-Powered Test Equipment | Distributed Telecom DC-DC System |
Use Scenario: Portable oscilloscope with Li-ion battery input powering analog front-end (3.3V) and digital processing (1.2V) rails. IC Role / Device Role / Timing Role: High-efficiency dual controller operating down to 2.75V VIN with 97% duty cycle to maximize battery life. Use Value: Micropower shutdown (6.5μA) and pulse-skipping mode maintain >85% efficiency at 10mA load, extending runtime between charges. |
Use Scenario: Intermediate bus converter in 48V telecom shelf supplying multiple 12V/5V point-of-load modules. IC Role / Device Role / Timing Role: Dual-phase controller synchronizing to system clock via PLL to eliminate beat frequencies and simplify EMI filtering. Use Value: PLL lock range (250–850kHz) and low-jitter phase alignment ensure clean timing across distributed power domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2965GQ-Z (Monolithic Power) | Integrated MOSFETs (40V max), fixed 600kHz frequency, no PLL sync, smaller package (4×4mm QFN-24) | Lower BOM count but limited to <12A per channel and 40V VIN; no tracking or external frequency tuning | Choose MP2965GQ-Z for cost-sensitive, lower-power designs where integration outweighs flexibility. |
| ISL95836IRZ (Renesas) | Supports 3–28V VIN, includes telemetry ADC, SMBus interface, but requires external RSENSE and lacks true PLL | Targeted at CPU VRMs with digital control; higher VIN range but larger solution size and added complexity | Choose ISL95836IRZ only when digital interface, telemetry, or wide-input operation is mandatory. |
Compared with MP2965GQ-Z and ISL95836IRZ, the LTC3836EUFD#PBF uniquely combines no-RSENSE operation, true PLL synchronization, dual independent soft-start/tracking, and optimized thermal QFN packaging for high-current, noise-sensitive, battery-powered dual-rail systems - making it irreplaceable where efficiency, EMI control, and sequencing precision are critical.
Availability
LTC3836EUFD#PBF is available at Aetrix Electronics and suitable for mobile processor power, industrial FPGA core supply, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3836EUFD#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, documentation, and manufacturing continuity for all Linear ICs including the LTC3836EUFD#PBF.
The LTC3836EUFD#PBF belongs to Linear's high-performance power controller family designed specifically for high-efficiency, multi-phase, dual-output DC/DC conversion in space-constrained, thermally demanding applications such as portable computing and telecom infrastructure.
FAQ
What is the maximum supported input voltage for the LTC3836EUFD#PBF?
The LTC3836EUFD#PBF has an absolute maximum input supply voltage (VIN) rating of 4.5V, with operational specification from 2.75V to 4.5V. Exceeding 4.5V risks permanent damage per Absolute Maximum Ratings. The controller is optimized for single-cell Li-ion (2.7–4.2V) and regulated 3.3V input systems - not intended for higher-voltage intermediate bus applications.
Does the LTC3836EUFD#PBF require external current sense resistors?
No, the LTC3836EUFD#PBF does not require external current sense resistors. It implements No RSENSE™ technology by measuring the voltage drop (VDS) across the external high-side N-channel MOSFET to derive current information. This eliminates sense resistor power loss and PCB area, directly improving full-load efficiency and thermal performance in the LTC3836EUFD#PBF design.
How does the tracking function work on the LTC3836EUFD#PBF?
The LTC3836EUFD#PBF uses the TRACK/SS2 pin to control VOUT2 startup behavior: it regulates VFB2 to the smaller of 0.6V or the voltage applied to TRACK/SS2. An internal 1μA current source charges an external capacitor on this pin to generate a linear ramp, enabling VOUT2 to track VOUT1. Alternatively, a resistor divider from another supply can be connected to achieve rail-to-rail tracking during power-up.
Can the LTC3836EUFD#PBF synchronize to an external clock outside the 250kHz–850kHz range?
The LTC3836EUFD#PBF's PLL is guaranteed to lock only within 250kHz to 850kHz. While typical capture range extends to ~200kHz–1MHz, operation outside the guaranteed band may result in unstable lock, increased jitter, or failure to acquire. For reliable synchronization, external clocks must fall strictly within the 250kHz–850kHz specification stated in the LTC3836EUFD#PBF datasheet.
What thermal advantages does the UFD package offer over the SSOP version of the LTC3836EUFD#PBF?
The LTC3836EUFD#PBF's 28-lead (4mm × 5mm) QFN package has θJA = 43°C/W, significantly lower than the 28-lead SSOP (GN) version's θJA = 90°C/W. This 2× improvement in thermal resistance allows higher sustained output current (e.g., 15A per channel) without derating, especially in compact layouts with limited airflow - a critical advantage for dense, high-power portable electronics using the LTC3836EUFD#PBF.
LTC3836EUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-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):
- 2.75V ~ 4.5V
- Frequency - Switching:
- 300kHz ~ 750kHz
- Duty Cycle (Max):
- 97%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC3836EUFD#PBF FAQ
1.How can I place an order for LTC3836EUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3836EUFD#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 LTC3836EUFD#PBF reliable?
The price and inventory of LTC3836EUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3836EUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3836EUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3836EUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3836EUFD#PBF?
LTC3836EUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3836EUFD#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 LTC3836EUFD#PBF?
For technical support, including LTC3836EUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3836EUFD#PBF requirements.
6.How does Aetrix verify that LTC3836EUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3836EUFD#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 LTC3836EUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3836EUFD#PBF?
All LTC3836EUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3836EUFD#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 LTC3836EUFD#PBF part is unused and in its original packaging.
Return procedure for LTC3836EUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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