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Analog Devices Inc. LTC3810IG#PBF
- Part No.:
- LTC3810IG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3810IG#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,561
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Product details
Overview
LTC3810IG#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, eliminates external current sense resistors, and drives dual N-channel MOSFETs for telecom power supplies and automotive high-voltage DC/DC conversion.
For engineers reviewing the LTC3810IG#PBF datasheet, LTC3810IG#PBF pinout, LTC3810IG#PBF application, or LTC3810IG#PBF equivalent, key selection criteria include its 100V max VIN rating, no-RSENSE operation, ±0.5% 0.8V reference accuracy, 25MHz error amplifier bandwidth, and 28-pin SSOP package with validated gate driver strength and thermal range.
Technical Context
The LTC3810IG#PBF implements a constant on-time valley current mode architecture with cycle-by-cycle current limiting-enabling accurate current limit without a sense resistor. Its 25MHz error amplifier delivers fast line/load transient response, while programmable on-time via ION and VON pins allows adaptive frequency control across wide input ranges.
Integrated bias control dynamically selects power source: EXTVCC during startup and short-circuit conditions, or output-derived INTVCC in regulation for higher efficiency. The device features dual 1Ω gate drivers (TG/BG), PGOOD monitoring with ±10% hysteresis, and programmable UVLO, overvoltage protection, and pulse-skip/forced-continuous mode selection via MODE/SYNC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input Voltage | 100V - enables direct conversion from 48V telecom or 72V automotive battery rails without pre-regulation. |
| Feedback Reference | 0.8V ±0.5% - ensures tight output voltage tolerance across –40°C to 125°C junction temperature range. |
| Error Amp Bandwidth | 25MHz - provides sub-microsecond load transient recovery critical for server VRMs and industrial PLCs. |
| Gate Driver Strength | 1.5A peak TG/BG source, 1Ω pull-down RDS(ON) - supports paralleling of multiple MOSFETs for >20A designs. |
| Min On-Time | <100ns - enables high VIN-to-low VOUT conversion (e.g., 75V→3.3V) at practical switching frequencies. |
| Operating Temp Range | –40°C to 125°C - qualified for under-hood automotive and base station environments. |
| Package | 28-Lead Plastic SSOP - surface-mount compatible with standard reflow profiles and IPC-7351B land pattern. |
Pinout & Package
Package: 28-Lead Plastic SSOP (G package), 0.635mm pitch, JEDEC MS-012AC compliant. Thermal resistance θJA = 80°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ION (1) | On-Time Current Input | Sets one-shot timer current; determines nominal switching frequency via external resistor to VIN. |
| VON (4) | On-Time Voltage Input | Adjusts on-time proportionality to VOUT; defaults to 0.7V (ground) or 2.4V (INTVCC) for high-VOUT optimization. |
| VRNG (5) | Sense Voltage Limit Set | Programs maximum current sense threshold (70–384mV) via resistive divider from INTVCC. |
| PGOOD (6) | Power Good Output | Open-drain flag pulled low if VFB deviates >±10% for ≥120μs - enables system-level fault sequencing. |
| MODE/SYNC (7) | Pulse Skip Enable / Clock Sync | Enables pulse skip (≥0.8V) or forces continuous mode/synchronizes to external clock (<0.8V). |
| ITH (8) | Error Amp Compensation / Current Threshold | 0–2.6V control voltage sets valley current limit; 1.2V = zero-current threshold. |
| VFB (9) | Feedback Input | Connects to resistor divider from VOUT; regulates output by servoing to 0.8V internal reference. |
| SS/TRACK (11) | Soft-Start / Tracking Input | Capacitor to ground sets soft-start ramp rate (~0.6s/μF); resistive divider enables ratiometric tracking. |
| SHDN (13) | Shutdown Control | Pull below 1.5V to disable both MOSFETs and reduce quiescent current to 240μA. |
| UVIN (14) | Input Undervoltage Sense | Resistive divider from VIN sets UVLO threshold; comparator trips at 0.8V with 10% hysteresis. |
| NDRV (15) | External Pass Device Drive | Drives gate of NMOS pass transistor for INTVCC linear regulator when EXTVCC < 6.7V. |
| EXTVCC (16) | External Driver Supply | When >6.7V, powers INTVCC via internal LDO and disables NDRV-driven regulator for efficiency. |
| INTVCC (17) | Main IC Supply | 6.35–14V supply for all internal circuits except gate drivers; bypass with ≥0.1μF capacitor. |
| DRVCC (18) | Driver Supply | Supplies BG driver; typically tied to INTVCC; 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 valley current sensing. |
| SW (26) | Switch Node | Connects to inductor and BOOST capacitor; voltage swings from –0.3V (Schottky drop) to VIN. |
| TG (27) | Top Gate Drive | Floating driver for high-side N-MOSFET; powered from BOOST, returns to SW node. |
| 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) or dedicated sense resistor with Kelvin SENSE+/- inputs for accurate valley current measurement without power loss. |
| 100V input capability | Supports direct conversion from unregulated 48V telecom, 72V automotive, or industrial HV rails - eliminates need for front-end buck pre-regulator. |
| 25MHz error amplifier | Delivers <1μs load transient recovery time - essential for CPU/GPU VRMs and real-time industrial control loops. |
| Dual 1Ω gate drivers | Enables driving multiple parallel MOSFETs or large single devices (Qg > 100nC) with minimal switching loss and layout sensitivity. |
| Programmable pulse-skip mode | Improves light-load efficiency by disabling both switches until ITH rises above 1.2V - reduces switching and gate drive losses. |
| Integrated bias control | Automatically selects EXTVCC (startup/short-circuit) or output-derived INTVCC (regulation) - maximizes efficiency across operating conditions. |
Applications
| Telecom Power Supply | Automotive ADAS ECU |
|---|---|
Use Scenario: 48V telecom rectifier output converted to 12V/6A for line card power distribution. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating intermediate bus voltage with 100V input tolerance and no-RSENSE current sensing. Use Value: Eliminates sense resistor power loss and board space; maintains ±0.5% regulation across -40°C to 85°C ambient. | Use Scenario: 12V battery input stepped down to 3.3V/5A for radar processor and sensor interface in autonomous driving module. IC Role / Device Role / Timing Role: High-reliability buck controller with integrated UVLO, PGOOD, and overvoltage protection for ASIL-B systems. Use Value: 125°C junction rating and robust dV/dt immunity (via BGRTN pin) ensure stable operation in engine bay environments. |
| Industrial PLC Power | Base Station RF Amplifier Bias |
Use Scenario: 24–72V industrial fieldbus input converted to isolated 5V/3A for microcontroller and I/O conditioning. IC Role / Device Role / Timing Role: Constant on-time controller delivering fast transient response to variable motor drive loads. Use Value: 25MHz error amp and programmable soft-start prevent brownouts during PLC boot-up and load switching. | Use Scenario: 48V base station supply converted to 28V/2A for GaN RF power amplifier bias rail with strict ripple requirements. IC Role / Device Role / Timing Role: Synchronous buck controller synchronized to external clock to avoid interference with RF transmit bands. Use Value: MODE/SYNC pin enables precise clock synchronization, reducing conducted EMI in sensitive RF front-ends. |
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 60V max VIN; integrated 5V/150mA LDO for gate drivers; lower 0.6V reference; no EXTVCC/NDRV bias control. | Optimized for 24–48V industrial systems requiring integrated bias supply; lacks 100V capability and no-RSENSE flexibility. | Select LTC3891 for cost-sensitive 48V systems where integrated LDO simplifies BOM; retain LTC3810IG#PBF for >60V inputs or no-RSENSE designs. |
| LM5116MH/NOPB | 100V max VIN; current-mode control; requires external current sense resistor; 1.215V reference; no PGOOD or tracking. | Designed for high-power industrial converters needing robust current sensing; lacks soft-start/tracking and precision 0.8V reference. | Choose LM5116 for high-current (>20A), high-temperature applications where external sense resistor is acceptable and PGOOD is not required. |
Compared with LTC3891EMSE#PBF and LM5116MH/NOPB, the LTC3810IG#PBF uniquely combines 100V operation, no-RSENSE valley current sensing, ±0.5% 0.8V reference, and dual-bias control (EXTVCC/NDRV) - making it optimal for high-input-voltage telecom and automotive systems demanding precision and efficiency across wide temperature ranges.
Availability
LTC3810IG#PBF is available at Aetrix Electronics and suitable for telecom power supplies, automotive ADAS ECUs, and industrial PLC power systems requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC3810IG#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, 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 LTC3810IG#PBF belongs to ADI's Power by Linear™ high-voltage controller family, engineered specifically for rugged, high-efficiency DC/DC conversion in telecom infrastructure, automotive electronics, and industrial equipment where input voltages exceed 60V.
FAQ
What is the maximum input voltage supported by the LTC3810IG#PBF?
The LTC3810IG#PBF supports a maximum input voltage of 100V, as confirmed by Absolute Maximum Ratings and Electrical Characteristics tables. This enables direct conversion from 48V telecom rectifiers, 72V automotive battery systems, and industrial HV rails without pre-regulation stages. Operation beyond 100V risks permanent damage per datasheet Note 1.
Does the LTC3810IG#PBF require an external current sense resistor?
No, the LTC3810IG#PBF does not require an external current sense resistor. It supports no-RSENSE operation by measuring the voltage drop across the bottom MOSFET's RDS(ON) using Kelvin-connected SENSE+ and SENSE– pins. This eliminates power loss and board space associated with discrete sense resistors while maintaining accurate cycle-by-cycle current limiting.
What is the operating temperature range for the LTC3810IG#PBF?
The LTC3810IG#PBF is specified for operation from –40°C to 125°C junction temperature, as stated in the Order Information table and Electrical Characteristics notes. The "I" grade designation confirms full performance validation across this extended industrial/automotive range, unlike the "E" grade (0°C to 85°C) variant.
How does the LTC3810IG#PBF manage its internal supply voltage?
The LTC3810IG#PBF uses integrated bias control to autonomously select its supply source: EXTVCC powers INTVCC during startup and output short-circuit conditions, while output-derived voltage takes over once VOUT exceeds 6.7V. This dual-path architecture maximizes efficiency and ensures reliable operation across all load and fault conditions without external circuitry.
Can the LTC3810IG#PBF be synchronized to an external clock?
Yes, the LTC3810IG#PBF can be synchronized to an external clock via the MODE/SYNC pin. When driven with a logic-level signal, the internal phase-locked loop aligns the rising edge of the top gate (TG) signal to the rising edge of the external clock - enabling noise-sensitive applications like RF power amplifiers to avoid switching frequency interference.
LTC3810IG#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
LTC3810IG#PBF FAQ
1.How can I place an order for LTC3810IG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3810IG#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 LTC3810IG#PBF reliable?
The price and inventory of LTC3810IG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3810IG#PBF is usually 5 days.
3.What payment methods are accepted for LTC3810IG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3810IG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3810IG#PBF?
LTC3810IG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3810IG#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 LTC3810IG#PBF?
For technical support, including LTC3810IG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3810IG#PBF requirements.
6.How does Aetrix verify that LTC3810IG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3810IG#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 LTC3810IG#PBF meets industry standards.
7.What is the process for return or replacement of LTC3810IG#PBF?
All LTC3810IG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3810IG#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 LTC3810IG#PBF part is unused and in its original packaging.
Return procedure for LTC3810IG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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