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Analog Devices Inc. LTC3810EG#PBF
- Part No.:
- LTC3810EG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3810EG#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:551
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Product details
Overview
LTC3810EG#PBF 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 regulation, 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#PBF datasheet, LTC3810EG#PBF pinout, LTC3810EG#PBF application, or LTC3810EG#PBF equivalent, key selection considerations include its 100V VIN capability, no-RSENSE current sensing, 25MHz error amplifier bandwidth, programmable frequency via ION resistor, and integrated bias control for EXTVCC/INTVCC supply management.
Technical Context
The LTC3810EG#PBF 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 minimum on-time (<100ns), while ION pin current (100–3000μA) and VON pin voltage (0.7V–2.4V) jointly determine switching frequency and duty-cycle stability across wide VIN ranges.
Fault protection includes cycle-by-cycle current limit (programmable via VRNG pin: 70–384mV), foldback current limiting during short-circuit, ±10% PGOOD monitoring with 120μs delay, and dual UVLO comparators (VIN at 0.8V threshold, INTVCC at 6.2V). Gate drivers deliver 1.5–2A peak source/sink with 1Ω pull-down RDS(ON) for both TG and BG outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | Up to 100V - enables direct conversion from 48V telecom or 72V automotive battery rails without pre-regulation. |
| Output Voltage Accuracy | ±0.5% at 0.8V reference - ensures tight regulation for sensitive downstream loads like FPGAs or DSPs. |
| Error Amplifier Bandwidth | 25MHz - delivers extremely fast line/load transient response (e.g., 5A step in <50μs). |
| Minimum On-Time | <100ns - supports high VIN-to-low VOUT ratios (e.g., 75V→3.3V) at practical switching frequencies. |
| Gate Driver Strength | 1.5–2A peak, 1Ω pull-down - reliably drives multiple paralleled MOSFETs or high-Qg devices in high-current designs. |
| Current Sense Architecture | No external sense resistor required - uses MOSFET RDS(ON) sensing with adjustable threshold (70–384mV) via VRNG pin. |
| Shutdown Current | 240μA - minimizes system standby power in always-on automotive or industrial applications. |
Pinout & Package
Package: 28-pin plastic SSOP (G package), 0.025" pitch, JEDEC MS-012AC, thermal pad not present. Pin count and physical layout match Linear Technology's standard 28-SSOP footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ION (1) | On-Time Current Input | Sets nominal switching frequency via external resistor to VIN; 100–3000μA range adjusts tON from ~515ns to ~1.85μs. |
| VON (4) | On-Time Voltage Input | Defines comparator trip point (0.7V–2.4V); ties to VOUT or divider to make tON proportional to output voltage. |
| VRNG (5) | Sense Voltage Limit Set | Programs max current sense threshold (70–384mV) to set cycle-by-cycle current limit without RSENSE. |
| PGOOD (6) | Power Good Output | Open-drain signal pulled low if VFB deviates >±10% for ≥120μs - used for system sequencing and fault reporting. |
| MODE/SYNC (7) | Pulse Skip Enable / Clock Sync | Enables pulse skip (≥0.8V) or forces continuous mode/synchronizes to external clock (<0.8V or logic edge). |
| ITH (8) | Error Amp Compensation / Current Threshold | 0–2.6V control voltage sets valley current limit; 1.2V = zero current, rising voltage increases current limit. |
| VFB (9) | Feedback Input | Connects to resistor divider from VOUT; regulates output by servoing to internal 0.8V reference. |
| SS/TRACK (11) | Soft-Start / Tracking Input | Capacitor to ground sets soft-start ramp (~0.6s/μF); resistive divider enables ratiometric tracking of another rail. |
| SHDN (13) | Shutdown Control | Pull below 1.5V to disable all drivers and reduce IQ to 240μA - critical for low-power sleep states. |
| UVIN (14) | Input Undervoltage Monitor | Resistor divider from VIN sets UVLO 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 high-VIN startup. |
| EXTVCC (16) | External Driver Supply | When >6.7V, powers INTVCC/DRVCC via internal LDO and disables NDRV - simplifies supply sequencing. |
| INTVCC (17) | Main IC Supply | 6.35–14V supply for all internal circuitry except gate drivers; bypass with ≥0.1μF capacitor near pin. |
| DRVCC (18) | Driver Supply | Supplies BG driver; tied to INTVCC by default; bypass to BGRTN with 1μF low-ESR capacitor. |
| BG (19) | Bottom Gate Drive | Drives source-connected N-MOSFET; swings from BGRTN to DRVCC - supports negative BGRTN for dV/dt immunity. |
| BGRTN (20) | Bottom Gate Return | Return path for BG driver; connect to ground or negative supply to suppress Miller-induced shoot-through. |
| SENSE– (21) | Current Sense Negative | Kelvin connection to bottom of sense resistor or MOSFET source - enables accurate RDS(ON) sensing. |
| SW (26) | Switch Node | Connects to inductor and BOOST capacitor; voltage swings from ~−0.3V to VIN - defines floating domain for TG driver. |
| TG (27) | Top Gate Drive | Drives gate of high-side N-MOSFET; powered from BOOST and returns to SW - true floating drive for bootstrap operation. |
| BOOST (28) | Top Gate Driver Supply | Charged via external Schottky diode from DRVCC; bypass to SW with 0.1μF low-ESR capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistor required | Uses MOSFET RDS(ON) sensing with programmable 70–384mV threshold - eliminates sense resistor power loss and board space. |
| 100V maximum input voltage | Directly accepts 48V telecom, 72V automotive, or industrial HV rails - avoids inefficient two-stage conversion. |
| Constant on-time valley current mode | Delivers stable operation across wide VIN and VOUT ranges with inherent line regulation and fast transient response. |
| Integrated EXTVCC/INTVCC bias control | Automatically switches between input-derived and output-derived supply - optimizes efficiency from startup through regulation. |
| Programmable pulse skip / forced continuous mode | Selectable via MODE/SYNC pin - maximizes light-load efficiency or ensures consistent EMI profile and low-current regulation. |
| Robust fault protection suite | Includes cycle-by-cycle current limit, foldback, PGOOD with mask timer, OV/UV comparators, and thermal shutdown - reduces external protection components. |
Applications
| Telecom Power Supply | Automotive ADAS ECU |
|---|---|
Use Scenario: 48V backplane-to-12V/5V conversion in base station power shelves with strict efficiency and reliability requirements. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-side and low-side N-MOSFETs, regulating output under dynamic load transients. Use Value: 100V VIN rating eliminates pre-regulator stage; no-RSENSE sensing improves efficiency by ~0.5% at 20A; PGOOD enables hot-swap sequencing. | Use Scenario: 72V battery-to-5V/3.3V conversion for radar processing units requiring low EMI and fail-safe monitoring. IC Role / Device Role / Timing Role: High-voltage step-down controller with synchronized switching to avoid interference with RF front-end receivers. Use Value: External clock sync capability allows alignment with system timing master; ±10% PGOOD window and 120μs delay prevent false fault triggers during load surges. |
| Industrial PLC I/O Module | High-Voltage Test Equipment |
Use Scenario: Isolated 24V/48V input powering multiple isolated 5V/3.3V rails in programmable logic controllers with extended temperature operation. IC Role / Device Role / Timing Role: Main DC/DC controller delivering regulated outputs with precise soft-start and tracking for multi-rail sequencing. Use Value: SS/TRACK pin enables ratiometric startup with auxiliary supplies; –40°C to 125°C junction rating ensures operation in uncooled enclosures. | Use Scenario: Programmable 100V input power stage in automated test equipment requiring precise current limiting and fault logging. IC Role / Device Role / Timing Role: High-accuracy current-mode controller implementing programmable cycle-by-cycle current limit via VRNG pin. Use Value: Adjustable 70–384mV current threshold enables fine-grained overcurrent protection; foldback mode prevents thermal runaway during output shorts. |
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#PBF | Higher 150V VIN rating; integrated 5V LDO for bias; no EXTVCC/NDRV pins; different pinout. | Supports wider input range and simpler biasing but lacks EXTVCC switchover flexibility and independent NDRV control. | Choose when input exceeds 100V or bias simplicity outweighs programmable supply architecture. |
| MP2918GL-Z | 60V max VIN; integrated MOSFET drivers only (no external FET control); fixed 0.6V reference; smaller 16-QFN package. | Targeted at lower-voltage, space-constrained applications; lacks high-voltage robustness and no-RSENSE flexibility. | Choose for cost-sensitive 12–48V systems where integration and footprint matter more than 100V operation. |
Compared with LTC3810EG#PBF, LTC3891EMSE#PBF extends input range and simplifies biasing but sacrifices EXTVCC/NDRV configurability, while MP2918GL-Z trades voltage capability and discrete FET control for integration and size - making LTC3810EG#PBF optimal for 100V, no-RSENSE, and flexible supply architectures.
Availability
LTC3810EG#PBF 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 long-term lifecycle support.
Supply support for LTC3810EG#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 the LTC portfolio.
The LTC3810EG#PBF belongs to Linear's high-voltage monolithic controller family, designed specifically for efficient, reliable, and feature-rich synchronous buck conversion in harsh environments like telecom infrastructure and automotive power systems.
FAQ
What is the maximum input voltage supported by the LTC3810EG#PBF?
The LTC3810EG#PBF supports up to 100V input voltage, verified per Absolute Maximum Ratings and Electrical Characteristics tables. This enables direct conversion from 48V telecom or 72V automotive battery rails without pre-regulation stages. Operation above 100V risks permanent damage and is outside guaranteed specifications.
Does the LTC3810EG#PBF require an external current sense resistor?
No, the LTC3810EG#PBF does not require an external current sense resistor. It implements no-RSENSE valley current sensing using the bottom MOSFET's RDS(ON), with programmable threshold (70–384mV) set via the VRNG pin. This eliminates sense resistor losses and PCB area while maintaining accurate cycle-by-cycle current limiting.
How does the LTC3810EG#PBF manage its internal supply voltages INTVCC and DRVCC?
The LTC3810EG#PBF uses integrated bias control to autonomously generate INTVCC and DRVCC. During startup, it derives power from VIN via the NDRV-controlled external NMOS. Once VOUT exceeds 6.7V, it switches to output-derived supply via EXTVCC. This dual-path architecture maximizes efficiency across operating conditions without external supervision.
Can the LTC3810EG#PBF be synchronized to an external clock?
Yes, the LTC3810EG#PBF can be synchronized to an external clock via the MODE/SYNC pin. When driven with a logic-level signal, its phase-locked loop aligns the rising edge of the top-gate (TG) signal to the external clock's rising edge - essential for EMI-sensitive applications like RF test equipment or automotive radar systems.
What protection features are built into the LTC3810EG#PBF?
The LTC3810EG#PBF integrates cycle-by-cycle current limiting, foldback current limiting during short-circuit, ±10% PGOOD monitoring with 120μs delay, input and INTVCC undervoltage lockout, output overvoltage protection, and thermal shutdown. These features reduce or eliminate the need for external protection circuitry in demanding applications.
LTC3810EG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3810EG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3810EG#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 LTC3810EG#PBF reliable?
The price and inventory of LTC3810EG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3810EG#PBF is usually 5 days.
3.What payment methods are accepted for LTC3810EG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3810EG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3810EG#PBF?
LTC3810EG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3810EG#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 LTC3810EG#PBF?
For technical support, including LTC3810EG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3810EG#PBF requirements.
6.How does Aetrix verify that LTC3810EG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3810EG#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 LTC3810EG#PBF meets industry standards.
7.What is the process for return or replacement of LTC3810EG#PBF?
All LTC3810EG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3810EG#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 LTC3810EG#PBF part is unused and in its original packaging.
Return procedure for LTC3810EG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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