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Analog Devices Inc. LTC3836EGN#PBF
- Part No.:
- LTC3836EGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3836EGN#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,064
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Product details
Overview
LTC3836EGN#PBF from Analog Devices (formerly Linear Technology) is a 2-phase, dual-output synchronous step-down DC/DC controller driving external N-channel MOSFETs without sense resistors. It operates from 2.75V to 4.5V input, delivers up to 15A per output, supports 300kHz–750kHz switching, and enables low-dropout operation with 97% duty cycle - ideal for battery-powered single Li-ion systems requiring tightly tracked 1.8V/1.2V rails.
For engineers reviewing the LTC3836EGN#PBF datasheet, LTC3836EGN#PBF pinout, LTC3836EGN#PBF application, or LTC3836EGN#PBF equivalent, key selection criteria include out-of-phase current sharing for reduced input capacitance, VDS-based current sensing, tracking start-up capability, PLL-based frequency synchronization, and thermal performance in the 28-lead SSOP package.
Technical Context
The LTC3836EGN#PBF implements constant-frequency current-mode control using MOSFET VDS sensing on two independent channels, eliminating external sense resistors and improving efficiency. Its dual controllers operate 180° out-of-phase to minimize RMS input ripple current and reduce required input capacitance.
It integrates a true phase-locked loop (PLL) for external clock synchronization (250kHz–850kHz), selectable pulse-skipping or forced continuous mode via SYNC/FCB, internal 1ms soft-start extendable with external capacitor, and independent peak current threshold selection (70mV/122mV/202mV) per channel via IPRG pins.
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 level-shifting. |
| Switching Frequency | 300kHz–750kHz (selectable); 250kHz–850kHz (PLL-synchronized) - balances efficiency vs. inductor/capacitor size. |
| Max Duty Cycle | 97% - enables low-dropout operation critical for battery end-of-life voltage retention. |
| Feedback Reference | 0.6V ±1.5% over –40°C to 85°C - ensures accurate output regulation across temperature. |
| Quiescent Current | 6.5μA in shutdown - minimizes battery drain during system sleep states. |
| Current Sense Method | VDS sensing (no RSENSE) - eliminates power loss and noise from sense resistors; improves efficiency. |
| Output Tracking | True analog tracking via TRACK/SS2 pin - enables controlled, matched start-up of second output relative to first. |
| Package Thermal Resistance | θJA = 90°C/W (SSOP) - defines junction-to-ambient rise under standard PCB layout conditions. |
Pinout & Package
The LTC3836EGN#PBF is housed in a 28-lead narrow plastic SSOP (GN package), thermally enhanced with exposed PGND connections at pins 17, 22, and 26. Pin 1 is SW1; pin 28 is SENSE2+; pin 29 is not present (QFN-only). The package supports standard reflow and meets JEDEC MS-012 specifications.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| SW1 / SW2 | Switch node connection | Drives external inductor and MOSFETs; serves as negative input to current comparator and reverse-current detector. |
| VFB1 / VFB2 | Feedback input | Compares output voltage (via resistor divider) to 0.6V reference; controls error amplifier output (ITH). |
| ITH1 / ITH2 | Error amp compensation / current threshold | 0.7V–2.0V range sets peak inductor current; used for loop compensation and current limit programming. |
| RUN/SS | Enable & external soft-start | Pulling below 0.65V disables both channels; internal 0.65μA current source enables controlled ramp-up. |
| TRACK/SS2 | Channel 2 tracking & soft-start | Regulates VFB2 to smaller of 0.6V or applied voltage - enables start-up tracking or programmable soft-start. |
| SYNC/FCB | PLL sync input / mode select | Accepts 250kHz–850kHz external clock; ties to VIN for pulse-skipping, to GND for forced continuous mode. |
| IPRG1 / IPRG2 | Peak sense voltage select | Three-state inputs (VIN/GND/floating) set max ΔVSENSE to 202mV/82mV/122mV per channel. |
| TG1 / TG2 | Top gate drive output | Drives external high-side N-MOSFET gates from PGND to BOOST; 40ns rise/fall time into 3000pF. |
| BG1 / BG2 | Bottom gate drive output | Drives external synchronous rectifier N-MOSFET gates; 50ns/40ns rise/fall into 3000pF. |
| PGOOD | Open-drain power-good monitor | Asserts low when either VFB deviates >±13.3% from 0.6V - signals fault or startup incomplete. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Eliminates sense resistor losses and EMI; uses MOSFET RDS(ON) and VDS for accurate current measurement. |
| Out-of-phase 2-phase operation | Reduces RMS input ripple current by ~70% vs. in-phase dual controllers - cuts required input capacitance nearly in half. |
| True PLL frequency locking | Enables deterministic phase alignment to external clocks (250kHz–850kHz) - essential for multi-rail EMI reduction. |
| Independent current limit programming | IPRG1/IPRG2 pins allow per-channel peak sense voltage selection - supports asymmetric load requirements. |
| Tracking start-up with internal soft-start | Ensures monotonic, coordinated ramp of dual outputs - prevents back-feeding or latch-up in cascaded power domains. |
| Low dropout operation (97% duty) | Maintains regulation down to VIN ≈ VOUT + 0.1V - extends runtime in battery-powered systems near end-of-discharge. |
Applications
| Li-ion Powered Portable Devices | Distributed DC Power Systems |
|---|---|
|
Use Scenario: Single-cell Li-ion (2.75V–4.2V) powers dual-core SoC requiring 1.8V @15A and 1.2V @15A with tight tracking. IC Role / Device Role / Timing Role: Dual-output synchronous buck controller managing phase-interleaved power delivery and coordinated start-up. Use Value: Eliminates sense resistors, reduces input cap count by 50%, and maintains regulation down to 2.8V input - extending usable battery capacity. |
Use Scenario: Central 3.3V supply feeds multiple point-of-load regulators; LTC3836EGN#PBF generates two tracked rails for FPGA I/O and core logic. IC Role / Device Role / Timing Role: High-efficiency, phase-controlled DC/DC controller delivering stable, synchronized outputs with minimal input ripple. Use Value: Out-of-phase operation lowers RMS input current, reducing heat in upstream converters and PCB trace losses. |
| High-Density Point-of-Load Converters | Industrial Embedded Control Units |
|
Use Scenario: Space-constrained industrial module requires dual 1.XV rails from 3.3V bus with strict EMI limits and no external sense resistors. IC Role / Device Role / Timing Role: Compact dual-phase controller enabling small inductors (0.47μH), low-profile caps, and PLL-synchronized switching. Use Value: 300kHz–750kHz frequency selection and PLL support allow EMI band placement away from sensitive receivers. |
Use Scenario: Programmable logic controller (PLC) with isolated 3.3V domain powers microcontroller (1.2V) and interface ICs (1.8V) under wide temperature (-40°C to 85°C). IC Role / Device Role / Timing Role: Robust dual-output controller with guaranteed specs over full temp range and integrated OVP/UVLO protection. Use Value: 0.6V ±1.5% reference and ±13.3% PGOOD window ensure reliable rail monitoring in harsh environments. |
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 |
|---|---|---|---|
| LTC3855IUFD#PBF | Single-output, higher VIN range (4.5V–38V), no tracking, supports 0.6V reference but lacks ITH-based current programming. | Suitable for non-tracked, higher-input industrial supplies; not drop-in for dual-rail Li-ion systems. | Select only if single output and wide VIN are primary requirements; incompatible pinout and feature set. |
| MP2918GL-Z | Monolithic dual-output buck (integrated MOSFETs), 2.5V–18V VIN, fixed 0.6V reference, no PLL, no VDS sensing. | Targets space-constrained designs where integration outweighs efficiency; limited to ≤10A per rail. | Choose for simplified BOM and layout; avoid when >10A per rail, Li-ion dropout, or EMI-sensitive PLL sync is needed. |
Compared with LTC3836EGN#PBF, LTC3855IUFD#PBF offers wider input range but lacks dual outputs and tracking, while MP2918GL-Z integrates power stages but sacrifices VDS sensing, PLL, and high-current capability - making LTC3836EGN#PBF uniquely suited for high-efficiency, tracked, dual-rail battery systems.
Availability
LTC3836EGN#PBF is available at Aetrix Electronics and suitable for Li-ion portable devices, distributed DC power systems, and high-density point-of-load converters requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LTC3836EGN#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 its high-performance analog and power management portfolio. Linear's legacy emphasizes precision, efficiency, and reliability in power conversion ICs.
The LTC3836EGN#PBF belongs to Linear's No RSENSE™ synchronous controller family, designed specifically for high-efficiency, low-noise, dual-output DC/DC conversion in battery-powered and space-constrained applications.
FAQ
What is the maximum supported input voltage for the LTC3836EGN#PBF?
The LTC3836EGN#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 device is optimized for single-cell Li-ion (2.75V–4.2V) and regulated 3.3V rails - not for higher-voltage industrial inputs.
Does the LTC3836EGN#PBF require external current sense resistors?
No, the LTC3836EGN#PBF uses MOSFET VDS sensing instead of external sense resistors - a core feature labeled No RSENSE™. It measures voltage drop across the main N-channel MOSFET's RDS(ON) to derive peak current, eliminating associated power loss, board area, and noise coupling. This is confirmed in the Features section and Functional Diagram.
How does the tracking function work on the LTC3836EGN#PBF?
The LTC3836EGN#PBF implements analog tracking via the TRACK/SS2 pin: it regulates VFB2 to the smaller of 0.6V or the voltage applied to TRACK/SS2. An internal 1μA pull-up current charges an external capacitor on this pin for programmable soft-start, or a resistor divider from another supply enables true voltage tracking during start-up - ensuring monotonic, coordinated ramp of both outputs.
Can the LTC3836EGN#PBF synchronize to an external clock, and what is the valid frequency range?
Yes, the LTC3836EGN#PBF features a true phase-locked loop (PLL) that synchronizes to an external clock applied to the SYNC/FCB pin. The guaranteed lock range is 250kHz to 850kHz over temperature, with typical capture up to 1MHz. External RC filtering on the PLLLPF pin is required for stable PLL operation - as specified in the Electrical Characteristics table and Operation section.
What package type and thermal characteristics does the LTC3836EGN#PBF use?
The LTC3836EGN#PBF uses a 28-lead narrow plastic SSOP (GN package) with θJA = 90°C/W. It features three PGND pins (17, 22, 26) for improved thermal conduction and low-inductance grounding. Unlike the QFN variant (UFD), this SSOP version has no exposed pad - thermal design must rely on standard PCB copper pour and via stitching under the package body.
LTC3836EGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- 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-SSOP
LTC3836EGN#PBF FAQ
1.How can I place an order for LTC3836EGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3836EGN#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 LTC3836EGN#PBF reliable?
The price and inventory of LTC3836EGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3836EGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC3836EGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3836EGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3836EGN#PBF?
LTC3836EGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3836EGN#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 LTC3836EGN#PBF?
For technical support, including LTC3836EGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3836EGN#PBF requirements.
6.How does Aetrix verify that LTC3836EGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3836EGN#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 LTC3836EGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC3836EGN#PBF?
All LTC3836EGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3836EGN#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 LTC3836EGN#PBF part is unused and in its original packaging.
Return procedure for LTC3836EGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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