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Analog Devices Inc. LTC3810HUH-5#PBF
- Part No.:
- LTC3810HUH-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3810HUH-5#PBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,872
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Product details
Overview
LTC3810HUH-5#PBF from Analog Devices (formerly Linear Technology) is a 60V input 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 150°C junction temperature, and enables high-efficiency telecom and automotive power supplies without requiring a current sense resistor.
For engineers reviewing the LTC3810HUH-5#PBF datasheet, LTC3810HUH-5#PBF pinout, LTC3810HUH-5#PBF application, or LTC3810HUH-5#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal specifications for H-grade operation, and real-world design implications of its no-RSENSE architecture and 1Ω gate drivers.
Technical Context
The LTC3810HUH-5#PBF implements a constant on-time valley current mode control architecture with cycle-by-cycle current limiting, where inductor valley current is sensed directly across the bottom MOSFET's RDS(on) via SENSE+ and SENSE– pins. Its 25MHz error amplifier enables sub-microsecond load transient response, and the ITH pin serves dual roles as compensation node and current threshold control point.
Frequency is set by external resistor on ION pin (tON(MIN) < 100ns), with programmable synchronization via MODE/SYNC pin. Integrated bias control autonomously selects between EXTVCC and output-derived INTVCC for gate drive, while BGRTN pin allows negative return voltage to suppress Miller-induced shoot-through during high dV/dt transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | Up to 60V continuous - supports direct 48V telecom and 24V/36V automotive battery inputs without pre-regulation. |
| Reference Voltage Accuracy | ±0.5% at 0.8V over –40°C to +150°C - ensures tight output regulation across full industrial and automotive temperature range. |
| Gate Driver Strength | 1Ω pull-down RDS(ON) for both TG and BG outputs - enables fast slew rates for paralleled MOSFETs in high-current designs. |
| Minimum On-Time | <100ns - permits high VIN-to-VOUT step-down ratios (e.g., 48V → 3.3V) at practical switching frequencies. |
| Shutdown Current | 240µA - maintains ultra-low quiescent power during system sleep modes in battery-backed applications. |
| Current Sense Architecture | No external sense resistor required - uses MOSFET RDS(on) sensing with adjustable VRNG-based threshold (70–384mV) for accurate valley current limit. |
| Thermal Rating | Junction temperature range: –40°C to +150°C - qualified for under-hood automotive and base station power supply environments. |
Pinout & Package
Package: 32-lead 5mm × 5mm plastic QFN (UH package) with exposed SGND pad (Pin 33) requiring PCB soldering for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VON (Pin 2) | On-time voltage input | Sets fixed on-time duration; tied to INTVCC for high-VOUT applications to reduce RON dependency. |
| VRNG (Pin 3) | Sense voltage limit set | Programs maximum current sense threshold (70–384mV); determines cycle-by-cycle current limit level. |
| PGOOD (Pin 4) | Open-drain power good output | Pulled low when VFB deviates >±10% for ≥120µs - enables system-level fault sequencing and brown-out detection. |
| MODE/SYNC (Pin 5) | Pulse skip enable / external clock sync | Enables forced continuous mode (<0.8V) or pulse skip mode (>0.8V); accepts external clock for EMI-sensitive applications. |
| ITH (Pin 6) | Error amp compensation / current threshold | 0–2.6V control voltage sets valley current limit; also used for loop compensation with external RC network. |
| VFB (Pin 7) | Feedback input | Connects to resistor divider from VOUT to set regulated output; referenced to internal 0.8V precision bandgap. |
| PLL/LPF (Pin 8) | Phase-locked loop filter | Hosts external capacitor for PLL stability; defaults to 1.2V when not synchronized to external clock. |
| SS/TRACK (Pin 9) | Soft-start / tracking input | Capacitor-to-ground sets soft-start ramp (~0.6s/µF); resistive divider enables ratiometric tracking of secondary rails. |
| SHDN (Pin 12) | Shutdown control | Pulled low (<1.5V) disables all drivers and reduces supply current to 240µA - critical for low-power standby states. |
| UVIN (Pin 13) | Input undervoltage lockout | Resistive divider from VIN sets UVLO threshold (0.8V reference with 10% hysteresis) - prevents startup at unsafe input levels. |
| NDRV (Pin 14) | External pass device driver | Drives gate of NMOS pass transistor for INTVCC linear regulator - enables efficient bias generation from high VIN. |
| EXTVCC (Pin 15) | External driver supply | Switches INTVCC sourcing from NDRV to EXTVCC when >4.7V - improves efficiency by bypassing linear regulator losses. |
| INTVCC (Pin 16) | Main internal supply | Powers all analog and logic circuits except gate drivers; requires local 0.1µF bypass to SGND (Pin 10). |
| DRVCC (Pin 17) | Bottom gate driver supply | Supplies BG driver; typically tied to INTVCC but may be decoupled separately for noise isolation. |
| BG (Pin 18) | Bottom gate drive output | Drives source-connected N-channel MOSFET; swings from BGRTN to DRVCC - supports negative BGRTN for shoot-through immunity. |
| BGRTN (Pin 19) | Bottom gate return | Return path for BG driver; connection to negative supply mitigates Miller-induced false turn-on during SW node transitions. |
| SENSE– (Pin 20) | Current sense negative input | Kelvin-senses bottom-side of sense element (MOSFET or resistor) - eliminates PCB trace resistance errors. |
| SW (Pin 25) | Switch node | Connects to inductor and bootstrap capacitor; voltage swing from –0.7V (Schottky drop) to VIN - defines high-side floating domain. |
| TG (Pin 26) | Top gate drive output | Drives gate of high-side N-MOSFET; powered from BOOST and returns to SW - enables true floating drive topology. |
| BOOST (Pin 27) | Top gate driver supply | Charged via external diode from DRVCC during off-time; requires 0.1µF low-ESR ceramic to SW for stable bootstrapping. |
| ION (Pin 31) | On-time current input | Resistor from VIN sets one-shot timer current - directly programs switching frequency independent of VIN variation. |
| SGND (Pin 33) | Signal ground | Exposed pad; must be soldered to PCB plane - serves as reference for all small-signal pins and thermal dissipation path. |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistor required | Uses MOSFET RDS(on) sensing via SENSE+/SENSE–, eliminating power loss and board space for discrete sense resistors. |
| Dual N-channel MOSFET synchronous drive | Integrated 1Ω TG and BG drivers support high-current, high-efficiency buck topologies with minimal external components. |
| Adjustable cycle-by-cycle current limit | VRNG pin sets precise current threshold (70–384mV), enabling robust short-circuit protection without derating. |
| Programmable output voltage tracking/soft-start | SS/TRACK pin supports both controlled startup ramp and coordinated sequencing with other rails in multi-output systems. |
| Power good output with ±10% window | PGOOD asserts after 120µs delay only when VFB remains outside regulation band - prevents false fault triggering during transients. |
| High-temperature H-grade qualification | Specified for –40°C to +150°C junction operation - suitable for under-hood automotive and industrial ambient conditions. |
Applications
| 48V Telecom Power Supply | Automotive ADAS Power Rail |
|---|---|
Use Scenario: Generating stable 12V/6A output from 36–60V telecom rectified bus in base station equipment. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-side and low-side N-MOSFETs with no sense resistor. Use Value: Achieves >95% efficiency at full load with 60V input capability and 150°C thermal rating for convection-cooled enclosures. |
Use Scenario: Powering radar sensor modules requiring tightly regulated 5V rail in engine compartment environments. IC Role / Device Role / Timing Role: High-reliability step-down controller with PGOOD monitoring and UVLO protection against battery transients. Use Value: Maintains regulation during cold-crank (4.5V) and load-dump (60V) events while operating continuously up to 150°C junction. |
| Industrial PLC I/O Module | Networking Equipment DC-DC Stage |
Use Scenario: Providing isolated 3.3V/3A supply for fieldbus interface circuitry in programmable logic controllers. IC Role / Device Role / Timing Role: Constant on-time controller delivering fast transient response to dynamic I/O load changes. Use Value: 25MHz error amplifier ensures <10µs recovery from 50% load steps, preventing communication glitches during burst traffic. |
Use Scenario: Generating 12V intermediate bus from 48V PoE++ infrastructure in enterprise switches and routers. IC Role / Device Role / Timing Role: Synchronizable buck controller enabling EMI reduction through clock alignment with system timing reference. Use Value: MODE/SYNC pin allows deterministic switching frequency locking to avoid beat frequencies with Ethernet PHY clocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EUH#PBF | Wider 4–60V input range; integrated 5V LDO for bias; no EXTVCC/NDRV flexibility | Better suited for systems needing self-contained bias without external pass FET | Select LTC3891EUH#PBF when simplified layout and integrated bias outweigh need for EXTVCC-driven efficiency optimization. |
| MP2918GL-Z | Lower 3–36V input range; 1.5A peak gate drive; no VRNG-adjustable current limit | Targeted at cost-sensitive mid-power applications below 20A output | Choose MP2918GL-Z only for ≤36V input designs where programmable current limit and 150°C operation are not required. |
Compared with LTC3810HUH-5#PBF, LTC3891EUH#PBF offers integrated bias but sacrifices EXTVCC efficiency tuning, while MP2918GL-Z lacks high-temperature qualification and adjustable current sensing - making LTC3810HUH-5#PBF uniquely suited for ruggedized 60V, 150°C applications demanding precise current limiting.
Availability
LTC3810HUH-5#PBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, automotive ADAS subsystems, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3810HUH-5#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 LTC3810-5 belongs to Linear's high-voltage synchronous buck controller family, designed specifically for robust, high-efficiency DC/DC conversion in telecom, automotive, and industrial power systems where input voltages exceed 40V.
FAQ
What is the maximum input voltage supported by the LTC3810HUH-5#PBF?
The LTC3810HUH-5#PBF supports up to 60V continuous input voltage, with absolute maximum ratings allowing 80V for ≤400ms transients. This enables direct operation from 48V telecom buses and 24V/36V automotive batteries without pre-regulation stages. The controller maintains stable regulation across this full range using its constant on-time architecture and VIN-compensated frequency setting.
Does the LTC3810HUH-5#PBF require an external current sense resistor?
No, the LTC3810HUH-5#PBF does not require an external current sense resistor. It implements MOSFET RDS(on)-based current sensing via the SENSE+ and SENSE– pins, with the VRNG pin allowing adjustment of the current threshold from 70mV to 384mV. This eliminates power loss and board area associated with discrete sense resistors while maintaining accurate cycle-by-cycle current limiting.
What is the operating temperature range for the LTC3810HUH-5#PBF?
The LTC3810HUH-5#PBF is rated for a junction temperature range of –40°C to +150°C, corresponding to the H-grade qualification. This exceeds standard industrial and automotive requirements, enabling deployment in under-hood automotive applications and thermally constrained telecom base station enclosures without derating.
How does the LTC3810HUH-5#PBF achieve fast transient response?
The LTC3810HUH-5#PBF achieves fast transient response through its 25MHz error amplifier bandwidth and constant on-time valley current mode control. The high-bandwidth amplifier enables rapid correction of feedback errors, while the valley current sensing architecture provides inherent stability and immediate response to load steps - demonstrated in typical performance curves showing <10µs recovery from 50% load transients.
Can the LTC3810HUH-5#PBF be synchronized to an external clock?
Yes, the LTC3810HUH-5#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 forces the rising edge of the top gate (TG) signal to align with the external clock's rising edge. This capability is essential for EMI-sensitive applications such as networking equipment, where deterministic switching frequency placement avoids interference with data transmission bands.
LTC3810HUH-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- 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):
- 4.35V ~ 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3810HUH-5#PBF FAQ
1.How can I place an order for LTC3810HUH-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3810HUH-5#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 LTC3810HUH-5#PBF reliable?
The price and inventory of LTC3810HUH-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3810HUH-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC3810HUH-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3810HUH-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3810HUH-5#PBF?
LTC3810HUH-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3810HUH-5#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 LTC3810HUH-5#PBF?
For technical support, including LTC3810HUH-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3810HUH-5#PBF requirements.
6.How does Aetrix verify that LTC3810HUH-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3810HUH-5#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 LTC3810HUH-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC3810HUH-5#PBF?
All LTC3810HUH-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3810HUH-5#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 LTC3810HUH-5#PBF part is unused and in its original packaging.
Return procedure for LTC3810HUH-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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