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Analog Devices Inc. LTC3836EGN#TRPBF
- Part No.:
- LTC3836EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3836EGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,697
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Product details
Overview
LTC3836EGN#TRPBF from Analog Devices (formerly Linear Technology) is a dual-output, 2-phase synchronous step-down DC/DC controller driving external N-channel MOSFETs for high-efficiency power conversion in space-constrained systems. It operates from 2.75V to 4.5V input, delivers up to 15A per output with 0.6V ±1.5% reference, supports 300kHz–750kHz switching, and enables out-of-phase operation to reduce input capacitance requirements - used in single Li-ion powered devices and distributed 3.3V-to-1.XV supplies.
For engineers reviewing the LTC3836EGN#TRPBF datasheet, LTC3836EGN#TRPBF pinout, LTC3836EGN#TRPBF application, or LTC3836EGN#TRPBF equivalent, key selection considerations include its no-RSENSE VDS-based current sensing, 97% duty cycle dropout capability, PLL-synchronized frequency control, tracking soft-start functionality, and thermally enhanced 28-lead SSOP package with exposed thermal pad.
Technical Context
The LTC3836EGN#TRPBF implements a constant-frequency current-mode architecture with two independent controllers operating 180° out-of-phase to minimize RMS input ripple current and enable smaller input capacitors. Each channel uses MOSFET VDS sensing instead of discrete sense resistors, eliminating associated power loss and noise while maintaining precise peak-current limiting via IPRG-selectable thresholds (82mV/122mV/202mV).
Its dual-loop control includes internal 0.6V reference with ±1.5% accuracy over –40°C to 85°C, programmable soft-start via RUN/SS and TRACK/SS2 pins, true PLL for external synchronization (250kHz–850kHz), and independent pulse-skipping or forced continuous mode selection per channel via SYNC/FCB pin - all coordinated through shared SGND and PGND domains with dedicated BOOST, TG, BG, and SENSE+ paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.75V to 4.5V - supports single-cell Li-ion and regulated 3.3V rails without pre-regulation. |
| Reference Voltage | 0.6V ±1.5% - ensures tight output regulation across temperature for stable 1.2V/1.8V/1.XV supplies. |
| Max Duty Cycle | 97% - enables low-dropout operation during battery voltage sag, extending runtime in portable systems. |
| Switching Frequency | 300kHz–750kHz (selectable); 250kHz–850kHz (PLL-sync) - balances efficiency vs. inductor/capacitor size tradeoffs. |
| Current Sense Method | No RSENSE; VDS sensing - eliminates sense resistor losses and PCB layout complexity while supporting >15A/channel. |
| Quiescent Current | 6.5μA in shutdown - minimizes battery drain during system standby or sleep modes. |
| Operating Temp | –40°C to +85°C - qualified for industrial and embedded applications with full spec compliance. |
Pinout & Package
The LTC3836EGN#TRPBF is housed in a 28-lead narrow-body SSOP package (GN) with 0.65mm pitch and thermally enhanced exposed pad (Pin 29 = GND). Package dimensions are 10.2mm × 5.3mm × 1.95mm, optimized for high-power density layouts requiring efficient heat dissipation through PCB copper.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| SW1/SW2 (1,14 / 26,11) | Switch Node | Connects to inductor and source/drain junction of external MOSFETs; serves as negative input to current comparator. |
| VIN (9) | Small-Signal Power Supply | Powers internal circuitry except gate drivers; requires RC filtering (e.g., 10Ω/1μF) to suppress noise coupling. |
| TG1/TG2 (23,21 / 20,18) | Top Gate Drive Output | Drives gates of external high-side N-MOSFETs with swing from PGND to BOOST voltage. |
| BG1/BG2 (25,19 / 22,15) | Bottom Gate Drive Output | Drives gates of external synchronous low-side N-MOSFETs with swing from PGND to BOOST. |
| SENSE1+/SENSE2+ (28,5 / 25,12) | Current Sense Input | Positive input to differential current comparator; also powers gate drivers; connects to main MOSFET drain. |
| ITH1/ITH2 (5,12 / 2,9) | Error Amplifier Compensation | Sets peak current threshold (0.7V–2.0V range); determines inductor current limit and loop stability. |
| TRACK/SS2 (10) | Channel 2 Tracking Input | Enables VOUT2 to track VOUT1 start-up via external capacitor or resistor divider; internal 1μA pull-up. |
| RUN/SS (20) | Enable & Soft-Start Control | Pull below 0.65V to shut down; internal 0.65μA current source enables programmable soft-start with external cap. |
| PGOOD (13) | Power-Good Monitor | Open-drain output pulled low if either VFB deviates >±13.3% from 0.6V - signals valid regulation status. |
| PLLLPF (7) | Freq Select / PLL Filter | Selects 300kHz (GND), 550kHz (float), or 750kHz (VIN); when PLL active, serves as loop filter node. |
| SYNC/FCB (24) | Sync Input / Mode Control | Accepts 250kHz–850kHz external clock for PLL sync; ties to VIN for pulse-skipping, GND for forced continuous. |
| IPRG1/IPRG2 (3,6 / 27,3) | Peak Sense Threshold Select | Three-state pins selecting 82mV (GND), 122mV (float), or 202mV (VIN) max VSENSE per channel. |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistors | Eliminates 1–3% power loss and thermal derating issues in high-current designs using MOSFET RDS(on) sensing. |
| Out-of-phase 2-phase operation | Reduces input capacitor RMS current by ~70%, enabling smaller ceramic input banks and lower EMI filtering cost. |
| True PLL synchronization | Guaranteed lock range 250kHz–850kHz allows deterministic timing alignment with system clocks or other converters. |
| Independent tracking & soft-start | Allows VOUT2 to ramp synchronously with VOUT1 using single external capacitor - critical for multi-rail SoC sequencing. |
| Programmable light-load mode | SYNC/FCB pin selects pulse-skipping (high efficiency) or forced continuous (low ripple/audio noise) per channel. |
| Output overvoltage protection | Hardware-based OVP triggers at +13.3% above 0.6V reference, disabling top FET and enabling bottom FET to clamp overshoot. |
Applications
| Single Li-ion Powered Devices | Distributed DC Power Systems |
|---|---|
|
Use Scenario: Portable medical monitors and handheld test equipment powered by one 3.3V nominal Li-ion cell with tight battery life constraints. IC Role / Device Role / Timing Role: Dual-output buck controller generating 1.8V @15A and 1.2V @15A from declining 4.2V–2.75V input, managing dynamic load transients. Use Value: 97% duty cycle maintains regulation down to 2.75V input, extending usable battery capacity by >12% versus fixed 90% controllers. |
Use Scenario: Industrial PLC backplanes distributing 3.3V and 1.2V to multiple FPGA, microcontroller, and interface modules. IC Role / Device Role / Timing Role: Centralized 2-phase controller delivering tightly tracked outputs with synchronized soft-start across modular subsystems. Use Value: Out-of-phase operation cuts input ripple current by 70%, reducing required bulk capacitance and easing thermal design on shared power bus. |
| General Purpose 3.3V-to-1.XV Supplies | Multi-Rail SoC Power Sequencing |
|
Use Scenario: Embedded vision systems requiring clean, sequenced 1.8V core and 1.2V I/O rails from a common 3.3V intermediate supply. IC Role / Device Role / Timing Role: Dual synchronous controller with independent feedback loops, tracking start-up, and PGOOD monitoring for rail integrity. Use Value: 0.6V ±1.5% reference ensures <±18mV absolute output tolerance at 1.2V, meeting FPGA core voltage spec margins. |
Use Scenario: High-performance edge AI accelerators with strict power-on reset timing between VCCINT, VCCAUX, and VCCO rails. IC Role / Device Role / Timing Role: Primary controller coordinating dual outputs with TRACK/SS2 pin enabling precise voltage ramp alignment and delay matching. Use Value: Internal 1ms soft-start plus external capacitor extension provides repeatable, jitter-free sequencing within ±50μs tolerance. |
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 |
|---|---|---|---|
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFET drivers only; no external FET support; fixed 500kHz freq. | Lower BOM count but limited to ≤10A/channel; lacks VDS sensing and PLL sync; unsuitable for >15A or noise-sensitive sync-critical systems. | Choose MP2918GL-Z only for cost-sensitive, medium-current applications where integration outweighs flexibility and performance. |
| LTC3855IUFD#PBF | Single-output, 2-phase controller with identical VDS sensing, PLL sync, and 97% duty cycle; same QFN package but no second output or TRACK pin. | Requires two ICs to replicate dual-output function; adds layout complexity and increases footprint; no inherent output tracking capability. | Choose LTC3855IUFD#PBF only when independent control of each phase is required or when output isolation is mandatory. |
Compared with MP2918GL-Z and LTC3855IUFD#PBF, the LTC3836EGN#TRPBF uniquely combines dual independent outputs, true 2-phase interleaving, no-RSENSE sensing, and hardware-enforced tracking - making it optimal for compact, high-current, multi-rail systems where efficiency, sequencing fidelity, and thermal management are co-prioritized.
Availability
LTC3836EGN#TRPBF is available at Aetrix Electronics and suitable for single Li-ion powered devices, distributed DC power systems, and general-purpose 3.3V-to-1.XV supplies requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC3836EGN#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 and long-term product roadmaps.
The LTC3836EGN#TRPBF belongs to Linear's high-efficiency synchronous controller family designed specifically for high-current, low-voltage DC/DC conversion in battery-powered and space-constrained industrial systems.
FAQ
What is the maximum supported input voltage for the LTC3836EGN#TRPBF?
The LTC3836EGN#TRPBF has an absolute maximum input supply voltage (VIN) rating of 4.5V. Its operational input range is specified from 2.75V to 4.5V, making it ideal for single-cell Li-ion (2.75V–4.2V) and regulated 3.3V intermediate bus applications. Exceeding 4.5V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3836EGN#TRPBF require external current sense resistors?
No, the LTC3836EGN#TRPBF uses MOSFET VDS sensing instead of external sense resistors - a feature branded No RSENSE. It measures voltage drop across the main N-channel MOSFET's RDS(on) to derive current, eliminating sense resistor losses, board area, and thermal concerns while supporting >15A per channel.
How does the LTC3836EGN#TRPBF achieve output voltage tracking during start-up?
The LTC3836EGN#TRPBF achieves tracking via the TRACK/SS2 pin (Pin 10), which sets VFB2's regulation target to the smaller of 0.6V or the voltage applied to that pin. Connecting an RC network or resistor divider from VOUT1 to TRACK/SS2 causes VOUT2 to ramp in precise proportion to VOUT1 - enabling reliable multi-rail SoC sequencing without external supervisors.
Can the LTC3836EGN#TRPBF be synchronized to an external clock source?
Yes, the LTC3836EGN#TRPBF features a true phase-locked loop (PLL) accessible via the SYNC/FCB pin (Pin 24). When driven with a CMOS-compatible clock signal between 250kHz and 850kHz, the internal oscillator locks to the external source, enabling deterministic timing alignment across multiple converters in noise-sensitive or EMI-constrained systems.
What package type and thermal characteristics does the LTC3836EGN#TRPBF use?
The LTC3836EGN#TRPBF uses a 28-lead narrow SSOP package (GN) with exposed thermal pad (Pin 29 = GND). Its θJA is 90°C/W, and the exposed pad must be soldered to PCB ground for effective thermal conduction. This package supports high-power density layouts while maintaining industrial-grade thermal performance up to 85°C ambient.
LTC3836EGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- 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):
- 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#TRPBF FAQ
1.How can I place an order for LTC3836EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3836EGN#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 LTC3836EGN#TRPBF reliable?
The price and inventory of LTC3836EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3836EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3836EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3836EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3836EGN#TRPBF?
LTC3836EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3836EGN#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 LTC3836EGN#TRPBF?
For technical support, including LTC3836EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3836EGN#TRPBF requirements.
6.How does Aetrix verify that LTC3836EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3836EGN#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 LTC3836EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3836EGN#TRPBF?
All LTC3836EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3836EGN#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 LTC3836EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3836EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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