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Analog Devices Inc. LTC3810EG#TRPBF
- Part No.:
- LTC3810EG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3810EG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,892
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Product details
Overview
LTC3810EG#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 0.5% DC output voltage accuracy, supports up to 100V input, enables cycle-by-cycle current limiting without a sense resistor, and drives dual N-channel MOSFETs for telecom power supplies and automotive high-voltage DC/DC conversion.
For engineers reviewing the LTC3810EG#TRPBF datasheet, LTC3810EG#TRPBF pinout, LTC3810EG#TRPBF application, or LTC3810EG#TRPBF equivalent, key selection criteria include its 100V max VIN rating, 25MHz error amplifier bandwidth, programmable minimum on-time (<100ns), ±0.5% 0.8V reference, and integrated bias control for gate drive supply generation during start-up and short-circuit conditions.
Technical Context
The LTC3810EG#TRPBF implements a constant on-time valley current mode architecture with a 25MHz error amplifier and internal 0.8V reference (±0.5% over temperature). Its one-shot timer sets on-time via ION pin current (100–300μA typical), enabling stable operation across wide input voltage ranges (7–100V) without external compensation.
It integrates dual 1Ω gate drivers (TG/BG peak source current ≥1.5A), supports external clock synchronization via MODE/SYNC pin, and features programmable undervoltage lockout (UVIN threshold = 0.8V with 10% hysteresis), output overvoltage protection, and PGOOD monitoring with 120μs delay and ±10% window.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input Voltage | 100V - Enables direct conversion from 48V telecom, 72V industrial, or 96V battery systems without pre-regulation. |
| Feedback Reference | 0.8V ±0.5% - Ensures tight DC output regulation across –40°C to 125°C junction temperature range. |
| Error Amp Bandwidth | 25MHz - Delivers extremely fast line/load transient response critical for server VRMs and automotive ECUs. |
| Min On-Time | <100ns - Supports high VIN-to-low VOUT ratios (e.g., 75V→3.3V) at practical switching frequencies. |
| Gate Driver Strength | 1.5A peak source / 1Ω pull-down - Drives multiple paralleled MOSFETs or high-Qg devices in high-current (>20A) designs. |
| Current Sense Method | No external sense resistor required - Uses MOSFET RDS(on) sensing via SENSE+/SENSE– pins with adjustable threshold (70–384mV). |
| Shutdown Current | 240μA - Enables ultra-low-power standby in automotive always-on modules and remote sensors. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), exposed pad not present, JEDEC MS-013AC compliant, thermal resistance θJA = 80°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ION (1) | On-Time Current Input | Sets nominal switching frequency via external resistor; 100–300μA current yields 250–605ns on-time. |
| VON (4) | On-Time Voltage Trip Point | Adjusts on-time proportionality to VOUT; tied to INTVCC for high-VOUT to reduce RON loss. |
| VRNG (5) | Sense Voltage Limit Set | Programs maximum current sense threshold (70–384mV) to match MOSFET RDS(on) or sense resistor value. |
| PGOOD (6) | Power Good Open-Drain Output | Asserts low when VFB deviates >±10% from 0.8V for ≥120μs - used for system sequencing and fault reporting. |
| MODE/SYNC (7) | Pulse Skip Enable / External Clock Input | Pull <0.8V for forced continuous mode; apply external clock for EMI-sensitive applications (e.g., RF subsystems). |
| ITH (8) | Error Amp Compensation / Current Threshold | Voltage (0–2.6V) sets valley current limit; 1.2V = zero current - used for loop compensation and current foldback. |
| VFB (9) | Feedback Input | Connects to resistor divider from VOUT; regulates output by servoing to 0.8V reference with 20nA input bias. |
| SS/TRACK (11) | Soft-Start / Output Tracking Input | Capacitor to ground sets soft-start ramp rate (~0.6s/μF); resistive divider enables ratiometric tracking of another rail. |
| SHDN (13) | Shutdown Control | Pull <1.5V to disable both MOSFETs and reduce supply current to 240μA - essential for low-power sleep modes. |
| UVIN (14) | Input Undervoltage Lockout Input | Resistive divider from VIN sets turn-on threshold; internal 0.8V comparator with 10% hysteresis prevents brownout oscillation. |
| NDRV (15) | External Pass Device Drive | Drives gate of NMOS pass transistor for INTVCC linear regulator - enables efficient IC supply from high VIN. |
| EXTVCC (16) | External Driver Supply Input | When >6.7V, powers INTVCC/DRVCC via internal LDO and disables NDRV path - improves efficiency above 6.7V VOUT. |
| INTVCC (17) | Main IC Supply | Supplies all internal circuitry except drivers; bypass with ≥0.1μF capacitor near pin to ensure stability. |
| DRVCC (18) | Driver Supply | Supplies BG driver; normally tied to INTVCC; bypass to BGRTN with 1μF low-ESR capacitor. |
| BG (19) | Bottom Gate Driver Output | Drives source-connected N-MOSFET gate; swings from BGRTN to DRVCC - supports negative BGRTN for Miller immunity. |
| BGRTN (20) | Bottom Gate Return | Source return for BG driver; connect to ground or negative supply (e.g., –2V) to suppress false turn-on during high dV/dt at SW node. |
| SENSE– (21) | Current Sense Negative Input | Kelvin connection to bottom of sense resistor or MOSFET source - rejects PCB trace resistance for accurate current sensing. |
| SW (26) | Switch Node | Connects to inductor and BOOST capacitor; voltage swings from ~–0.3V (Schottky drop) to VIN - defines floating domain for TG driver. |
| TG (27) | Top Gate Driver Output | Drives drain-connected N-MOSFET gate; powered from BOOST and returns to SW - enables true floating drive for high-side switch. |
| BOOST (28) | Top Gate Driver Supply | Charged via external Schottky diode from DRVCC; bypass to SW with 0.1μF low-ESR capacitor - sustains TG drive during long off-times. |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistor required | Enables RDS(on)-based current sensing with programmable threshold (70–384mV), reducing BOM cost and board space. |
| Dual N-channel MOSFET synchronous drive | Integrated 1.5A peak TG/BG drivers eliminate need for external gate driver ICs in high-efficiency 10–40A converters. |
| Programmable minimum on-time & frequency | ION pin sets tON(MIN) <100ns and fSW; supports 75V→3.3V conversion at 250kHz without pulse skipping. |
| Integrated bias control for gate drive supply | Automatically switches INTVCC sourcing from VIN (start-up/short-circuit) to VOUT (regulation) - maximizes efficiency across operating conditions. |
| Power Good with ±10% window & 120μs delay | Provides reliable system-level power sequencing and fault detection without external comparators or timers. |
| Selectable pulse skip or forced continuous mode | MODE/SYNC pin selects light-load efficiency optimization (pulse skip) or consistent EMI profile (forced continuous) - no hardware change needed. |
Applications
| Telecom 48V Intermediate Bus Converter | Automotive 12V/24V/48V System Power |
|---|---|
Use Scenario: Converting 48V telecom rectified input to 12V intermediate bus for downstream POL converters in base station equipment. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-side/lower-side N-MOSFETs, providing cycle-by-cycle current limiting and fast transient response. Use Value: 100V VIN rating eliminates need for pre-regulator; 25MHz error amp ensures <50μs load transient recovery; PGOOD enables safe hot-swap insertion. | Use Scenario: Generating stable 5V/3.3V rails from variable automotive battery (9–16V cold crank, up to 60V load dump) in engine control units. IC Role / Device Role / Timing Role: High-reliability step-down controller with UVLO hysteresis, overvoltage protection, and -40°C to 125°C operation. Use Value: Programmable UVIN threshold protects against brownout; output OVP shuts down M1 during transients; SHDN enables microamp sleep current. |
| Industrial High-Voltage DC Power Supply | Networking Equipment PoE++ Midspan |
Use Scenario: Building 24V/48V outputs from 100V industrial DC distribution bus in factory automation controllers. IC Role / Device Role / Timing Role: Robust current-mode controller with integrated 1Ω gate drivers, capable of driving paralleled MOSFETs for >30A loads. Use Value: No sense resistor reduces heat and cost; adjustable VRNG accommodates wide RDS(on) tolerance; EXTVCC LDO improves efficiency above 6.7V. | Use Scenario: Providing isolated 54V power to IEEE 802.3bt Type 4 (90W) PoE++ midspan injectors with strict EMI requirements. IC Role / Device Role / Timing Role: Synchronizable buck controller allowing precise clock alignment to avoid noise coupling into Ethernet PHY signals. Use Value: MODE/SYNC pin accepts external clock up to 2MHz; constant-frequency operation simplifies EMI filter design; 100V rating handles PoE open-circuit voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EMSE#TRPBF | Higher integration: includes 5V/10V bias regulators, wider VIN range (4–140V), but no EXTVCC LDO or NDRV control. | Designed for ultra-high-VIN industrial apps; lacks LTC3810EG#TRPBF's dedicated gate drive supply management for optimal efficiency below 6.7V. | Choose LTC3891 for >100V inputs or integrated bias; choose LTC3810EG#TRPBF when EXTVCC/NDRV control is critical for mixed-input/output supply architectures. |
| MPQ4316-AEC1 | Automotive-grade (AEC-Q100), integrated MOSFETs (60V/7A), fixed 500kHz fSW, no ION/VON/VRNG programming. | Targeted at compact 12V automotive DC/DC; lacks LTC3810EG#TRPBF's 100V rating, programmable min on-time, and external MOSFET flexibility. | Choose MPQ4316-AEC1 for space-constrained AEC-Q100 designs; choose LTC3810EG#TRPBF when 100V support, discrete FET selection, or custom timing is required. |
Compared with LTC3891EMSE#TRPBF and MPQ4316-AEC1, the LTC3810EG#TRPBF uniquely balances 100V operation, programmable timing/current thresholds, and intelligent gate drive supply routing - making it optimal for telecom and industrial systems where input voltage range, efficiency across load, and discrete FET optimization are jointly critical.
Availability
LTC3810EG#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, automotive ECUs, and industrial high-voltage DC/DC converters requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LTC3810EG#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3810EG#TRPBF belongs to ADI's Power by Linear™ high-voltage controller family, designed specifically for robust, efficient, and flexible synchronous step-down conversion in harsh environments including telecom infrastructure, automotive, and industrial systems.
FAQ
What is the maximum input voltage supported by the LTC3810EG#TRPBF?
The LTC3810EG#TRPBF supports a maximum input voltage of 100V, verified per Absolute Maximum Ratings and confirmed in the Electrical Characteristics table. This allows direct conversion from 48V telecom rectified buses, 72V industrial DC links, and 96V battery systems without pre-regulation stages. Operation above 100V risks permanent damage per datasheet Note 1.
Does the LTC3810EG#TRPBF require an external current sense resistor?
No, the LTC3810EG#TRPBF does not require an external current sense resistor. It supports MOSFET RDS(on) current sensing via the SENSE+ and SENSE– pins, with the VRNG pin setting the current sense threshold between 70mV and 384mV. This eliminates sense resistor losses and board area while maintaining cycle-by-cycle current limiting.
How is the switching frequency programmed on the LTC3810EG#TRPBF?
The switching frequency of the LTC3810EG#TRPBF is programmed via the ION pin (Pin 1): a resistor from VIN to ION sets the one-shot timer current, which determines on-time and thus frequency. Typical values yield 250–605ns on-time at 100–300μA. Frequency can also be synchronized to an external clock applied to the MODE/SYNC pin (Pin 7) for EMI-sensitive applications.
What is the purpose of the BGRTN pin on the LTC3810EG#TRPBF?
The BGRTN pin (Pin 20) is the bottom gate driver return terminal. It provides a separate connection point for the BG driver's source return, enabling connection to ground or a negative supply (e.g., –2V) to suppress false turn-on caused by Miller capacitance coupling during high dV/dt transitions at the SW node - a critical feature for reliable high-side/lower-side MOSFET operation.
Can the LTC3810EG#TRPBF operate with an output voltage lower than 6.7V?
Yes, the LTC3810EG#TRPBF can operate with output voltages below 6.7V. When VOUT < 6.7V, the internal LDO from EXTVCC is disabled and the IC derives INTVCC/DRVCC from VIN via the NDRV-controlled external NMOS pass device. This ensures proper gate drive and controller operation even for 3.3V or 5V outputs fed from high-VIN sources.
LTC3810EG#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
LTC3810EG#TRPBF FAQ
1.How can I place an order for LTC3810EG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3810EG#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 LTC3810EG#TRPBF reliable?
The price and inventory of LTC3810EG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3810EG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3810EG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3810EG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3810EG#TRPBF?
LTC3810EG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3810EG#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 LTC3810EG#TRPBF?
For technical support, including LTC3810EG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3810EG#TRPBF requirements.
6.How does Aetrix verify that LTC3810EG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3810EG#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 LTC3810EG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3810EG#TRPBF?
All LTC3810EG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3810EG#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 LTC3810EG#TRPBF part is unused and in its original packaging.
Return procedure for LTC3810EG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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