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Analog Devices Inc. LTC3810IG#TRPBF
- Part No.:
- LTC3810IG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3810IG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,385
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Product details
Overview
LTC3810IG#TRPBF from Analog Devices (formerly Linear Technology) is a 100V synchronous step-down switching regulator controller using constant on-time valley current mode control. It delivers precise 0.8V ±0.5% reference accuracy, supports up to 25MHz error amplifier bandwidth for fast transient response, and drives dual N-channel MOSFETs with 1.5A peak gate drivers-enabling high-efficiency telecom power supplies, automotive DC/DC converters, and industrial 48V-to-12V systems.
For engineers reviewing the LTC3810IG#TRPBF datasheet, LTC3810IG#TRPBF pinout, LTC3810IG#TRPBF application, or LTC3810IG#TRPBF equivalent, key selection criteria include its 100V input capability, no-sense-resistor current sensing, programmable on-time via ION pin (<100ns minimum), PGOOD monitoring, and SSOP-28 package compatibility with high-voltage layout requirements.
Technical Context
The LTC3810IG#TRPBF implements a constant on-time valley current mode architecture where top MOSFET conduction time is set by an external resistor on the ION pin, enabling stable operation across wide VIN ranges (7V–100V) without compensation. Its 25MHz error amplifier provides rapid line/load regulation, while the ITH pin directly modulates cycle-by-cycle current limit threshold between –300mV and +384mV based on VRNG voltage.
Integrated bias control dynamically selects power source for INTVCC/DRVCC: startup and short-circuit conditions draw from VIN via EXTVCC, while regulated operation draws from VOUT for efficiency. The device supports external clock synchronization via MODE/SYNC pin and includes foldback current limiting, overvoltage protection, and undervoltage lockout on both VIN and INTVCC rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7V to 100V - enables direct conversion from 48V telecom, 72V industrial, or 96V battery systems without pre-regulation. |
| Feedback Reference | 0.8V ±0.5% - ensures tight output voltage regulation across –40°C to 125°C junction temperature range. |
| Error Amplifier BW | 25MHz - delivers sub-μs load transient recovery in high-performance server and networking power supplies. |
| Min On-Time | <100ns - supports high VIN-to-low VOUT ratios (e.g., 75V→3.3V) at 250kHz+ switching frequencies. |
| Gate Driver Strength | 1.5A peak, 1Ω pull-down - drives multiple parallel MOSFETs or large Qg devices like Si7456DP with minimal switching loss. |
| Current Sense Range | –300mV to +384mV - enables accurate valley current sensing using MOSFET RDS(on) without external shunt resistor. |
| Shutdown Current | 240μA - reduces system standby power in automotive infotainment and industrial control applications. |
Pinout & Package
Package: 28-pin Plastic SSOP (G package), 0.635mm pitch, –40°C to 125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ION (Pin 1) | On-Time Timing Input | Resistor from VIN sets one-shot timer current; determines switching frequency and compensates for VIN variation. |
| VON (Pin 4) | On-Time Voltage Threshold | Sets comparator trip point for on-time extension; tied to INTVCC for high-VOUT designs to reduce RON value. |
| VRNG (Pin 5) | Current Sense Limit Control | 0.5V–2V input sets nominal sense voltage (95mV–215mV); defines maximum valley current threshold. |
| PGOOD (Pin 6) | Power Good Monitor | Open-drain output asserts low when VFB deviates >±10% for ≥120μs; used for system sequencing and fault reporting. |
| MODE/SYNC (Pin 7) | Operation Mode Control | Pull <0.8V for forced continuous mode; pull >0.8V for pulse skip; accept external clock for EMI-sensitive applications. |
| ITH (Pin 8) | Error Amplifier Output / Current Limit | 0V–2.6V voltage controls valley current threshold; 1.2V = zero-current level; used for soft-start and tracking. |
| VFB (Pin 9) | Feedback Input | Connects to resistor divider from VOUT; internal 0.8V reference enables precise output voltage setting. |
| SS/TRACK (Pin 11) | Soft-Start / Tracking Input | Capacitor to ground sets ramp rate (~0.6s/μF); resistive divider enables ratiometric tracking of another rail. |
| SHDN (Pin 13) | Shutdown Control | Pull <1.5V to disable controller and reduce supply current to 240μA; logic-compatible with microcontroller GPIO. |
| UVIN (Pin 14) | Input UVLO Input | Resistive divider from VIN sets undervoltage lockout threshold; internal 0.8V reference with 10% hysteresis. |
| NDRV (Pin 15) | External LDO Pass Device Gate | Drives NMOS pass transistor for INTVCC linear regulator; enables efficient high-VIN startup without external LDO. |
| EXTVCC (Pin 16) | External Driver Supply | When >6.7V, powers INTVCC/DRVCC via internal LDO; disables NDRV-driven regulator for higher efficiency. |
| INTVCC (Pin 17) | Main IC Supply | Powers internal circuitry except gate drivers; requires ≥0.1μF ceramic bypass capacitor near pin. |
| DRVCC (Pin 18) | Bottom Gate Driver Supply | Supplies BG driver; normally tied to INTVCC; bypassed to BGRTN with 1μF low-ESR capacitor. |
| BG (Pin 19) | Bottom Gate Driver Output | Drives source-connected N-MOSFET gate; swings from BGRTN to DRVCC; supports negative BGRTN for Miller immunity. |
| BGRTN (Pin 20) | Bottom Gate Return | Source connection for BG driver; allows negative supply to suppress false turn-on during high dV/dt at SW node. |
| SENSE– (Pin 21) | Current Sense Negative Input | Kelvin connection to bottom of sense resistor or MOSFET source; rejects PCB trace resistance errors. |
| SW (Pin 26) | Switch Node | Connects to inductor and bootstrap capacitor; voltage swings from ~–0.4V (Schottky drop) to VIN. |
| TG (Pin 27) | Top Gate Driver Output | Drives high-side N-MOSFET gate; floating driver powered from BOOST; returns to SW node. |
| BOOST (Pin 28) | Top Gate Driver Supply | Charged via external Schottky diode from DRVCC; bypassed to SW with 0.1μF low-ESR capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistor required | Uses MOSFET RDS(on) for valley current sensing-reduces BOM cost, board space, and power loss in high-current designs. |
| Programmable minimum on-time <100ns | Enables stable 250kHz+ operation at high input-to-output voltage ratios (e.g., 75V→5V), critical for compact telecom power modules. |
| Dual independent UVLO comparators | Separate thresholds for VIN (0.8V reference) and INTVCC (6.2V) ensure safe startup and prevent erratic gate drive under brownout conditions. |
| Integrated bootstrap refresh timeout | Forces bottom MOSFET on every 25μs in pulse skip mode-guarantees reliable BOOST capacitor recharge without external circuitry. |
| Adjustable cycle-by-cycle current limit | VRNG pin scales current sense threshold from 95mV to 215mV; allows precise overcurrent protection tuning across load and temperature. |
| Power Good with 120μs delay mask | Prevents false PGOOD assertion during startup transients; provides clean system-level power sequencing signal for FPGA/CPU rails. |
Applications
| Telecom Power Supply | Automotive ADAS ECU |
|---|---|
Use Scenario: 48V backplane-to-12V intermediate bus conversion in base station RF power amplifiers. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 12V/6A output with 100V input tolerance for lightning surge resilience. Use Value: Eliminates pre-regulator stage, reduces component count by 30%, and maintains >92% efficiency at full load per typical application (TA01). | Use Scenario: 12V-to-3.3V/5V power for radar sensor SoCs in harsh automotive environments. IC Role / Device Role / Timing Role: High-reliability buck controller with extended temperature support (–40°C to 125°C) and integrated fault protection. Use Value: Built-in overvoltage shutdown and foldback current limiting prevent damage during load dump events per ISO 7637-2. |
| Industrial PLC I/O Module | Networking Switch ASIC Supply |
Use Scenario: 24V/48V field bus input converted to isolated 5V/3.3V for digital I/O conditioning circuits. IC Role / Device Role / Timing Role: Controller enabling no-sense-resistor design with precise current limiting for short-circuit robustness. Use Value: Reduces thermal stress on sense resistors and improves long-term reliability in unventilated enclosures. | Use Scenario: High-efficiency 48V-to-0.85V core supply for 100G Ethernet switch ASICs requiring fast transient response. IC Role / Device Role / Timing Role: Fast 25MHz error amplifier and programmable soft-start enable <100μs load step recovery. Use Value: Maintains <±1% output regulation during 0–5A load steps, preventing ASIC reset or data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EG#TRPBF | Higher 150V max VIN, integrated MOSFET drivers with 3.5A peak, dual output capability, but larger 38-pin QFN package. | Required for >100V input systems (e.g., 125V traction battery interfaces); not drop-in compatible due to pinout and feature set differences. | Select when input exceeds 100V or dual-rail regulation is needed; verify PCB layout change for QFN thermal pad and routing. |
| MP2918GL-Z | 60V max VIN, integrated MOSFETs, lower 3.3V–28V input range, smaller 20-pin QFN, no EXTVCC/NDRV bias control. | Suitable for cost-sensitive 24V/48V embedded systems where 100V rating is unnecessary; lacks high-voltage startup architecture. | Choose for simplified design with integrated FETs and lower BOM count where input stays ≤60V; avoid for telecom or industrial 100V applications. |
Compared with LTC3810IG#TRPBF, LTC3891EG#TRPBF extends voltage range and adds dual outputs but increases complexity and footprint, while MP2918GL-Z trades voltage capability for integration and cost-making LTC3810IG#TRPBF optimal for 100V standalone buck control with flexible bias management.
Availability
LTC3810IG#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, automotive ADAS ECUs, and industrial PLC I/O modules requiring stable component supply with guaranteed long-term availability and full temperature-range performance.
Supply support for LTC3810IG#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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC3810 series.
The LTC3810IG#TRPBF belongs to Linear's high-voltage synchronous buck controller family, designed specifically for robust, high-efficiency DC/DC conversion in telecom infrastructure, automotive, and industrial systems operating up to 100V input.
FAQ
What is the absolute maximum input voltage rating for the LTC3810IG#TRPBF?
The LTC3810IG#TRPBF has an absolute maximum input voltage rating of 100V on the VIN pin, with SW pin rated to –1V to 100V and BOOST pin rated to –0.3V to 114V. This allows direct operation from 48V telecom, 72V industrial, or 96V battery systems without pre-regulation. Operation above 100V violates Absolute Maximum Ratings and may cause permanent damage.
Does the LTC3810IG#TRPBF require an external current sense resistor?
No, the LTC3810IG#TRPBF does not require an external current sense resistor. It supports no-RSENSE operation by sensing the voltage drop across the bottom N-channel MOSFET's RDS(on) using the SENSE+ and SENSE– pins. The VRNG pin adjusts the current sense threshold from 95mV to 215mV, enabling accurate valley current control without added power loss or board space.
How does the LTC3810IG#TRPBF manage gate driver supply during startup and fault conditions?
The LTC3810IG#TRPBF uses integrated bias control to generate INTVCC/DRVCC from VIN during startup and output short-circuit conditions via the EXTVCC pin and an external SOT23 MOSFET. Once VOUT exceeds 6.7V, it automatically switches to VOUT-derived supply for higher efficiency. This eliminates need for external LDOs or charge pumps while ensuring reliable gate drive under all operating conditions.
What is the purpose of the BGRTN pin on the LTC3810IG#TRPBF?
The BGRTN pin on the LTC3810IG#TRPBF is the dedicated return path for the bottom gate driver. It allows connection to a negative supply (e.g., –2V) to counteract Miller capacitance-induced gate voltage spikes during high dV/dt transitions at the SW node. This prevents false turn-on of the bottom MOSFET and eliminates shoot-through risk in high-frequency, high-voltage synchronous buck designs.
Can the LTC3810IG#TRPBF be synchronized to an external clock, and how is this implemented?
Yes, the LTC3810IG#TRPBF can be synchronized to an external clock via the MODE/SYNC pin. When an external logic-level clock signal is applied, the internal phase-locked loop forces the rising edge of the top gate (TG) signal to align with the clock's rising edge. This reduces EMI in noise-sensitive applications such as medical imaging or high-speed data acquisition systems without compromising regulation performance.
LTC3810IG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 6.35V ~ 14V
- Frequency - Switching:
- -
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3810IG#TRPBF FAQ
1.How can I place an order for LTC3810IG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3810IG#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 LTC3810IG#TRPBF reliable?
The price and inventory of LTC3810IG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3810IG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3810IG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3810IG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3810IG#TRPBF?
LTC3810IG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3810IG#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 LTC3810IG#TRPBF?
For technical support, including LTC3810IG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3810IG#TRPBF requirements.
6.How does Aetrix verify that LTC3810IG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3810IG#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 LTC3810IG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3810IG#TRPBF?
All LTC3810IG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3810IG#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 LTC3810IG#TRPBF part is unused and in its original packaging.
Return procedure for LTC3810IG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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