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Analog Devices Inc. LTC3810IUH-5#TRPBF
- Part No.:
- LTC3810IUH-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3810IUH-5#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,614
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Product details
Overview
LTC3810IUH-5#TRPBF 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 25MHz error amplifier bandwidth for fast transient response, and drives dual N-channel MOSFETs without requiring a current sense resistor. It is designed for telecom power supplies, automotive high-voltage DC/DC conversion, and industrial base station systems.
For engineers reviewing the LTC3810IUH-5#TRPBF datasheet, LTC3810IUH-5#TRPBF pinout, LTC3810IUH-5#TRPBF application, or LTC3810IUH-5#TRPBF equivalent, key selection criteria include its 60V max input rating, 100ns minimum on-time capability, programmable cycle-by-cycle current limit, integrated bias control for startup and short-circuit operation, and synchronization support for noise-sensitive designs.
Technical Context
The LTC3810IUH-5#TRPBF implements a constant on-time valley current mode architecture where top MOSFET conduction duration is set by an external ION resistor and modulated via VON voltage feedback, enabling stable low-duty-cycle operation down to <100ns. Its 25MHz error amplifier directly controls the ITH node to adjust valley current threshold in real time against load and line transients.
Integrated gate drivers deliver 0.7–1A peak source current with 1Ω pull-down RDS(ON) per driver, supporting parallel MOSFET configurations. Bias generation switches automatically between EXTVCC (≥4.7V) and NDRV-regulated INTVCC, ensuring robust gate drive during startup and output short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input Voltage | 60V continuous - enables direct regulation from 48V telecom or automotive battery rails without pre-regulation. |
| Reference Accuracy | ±0.5% at 0.8V - ensures tight output voltage tolerance across –40°C to 125°C junction temperature range. |
| Min On-Time | <100ns - supports high VIN/VOUT ratios (e.g., 48V→3.3V) while maintaining practical switching frequencies. |
| Error Amp Bandwidth | 25MHz - delivers sub-microsecond load transient recovery critical for CPU/GPU core power applications. |
| Gate Driver Strength | 1Ω pull-down RDS(ON), 0.7–1A peak source - drives multiple paralleled MOSFETs with minimal gate charge delay. |
| Shutdown Current | 240µA - reduces system standby power in always-on automotive or networking equipment. |
| Current Sense Method | No external sense resistor required - uses MOSFET RDS(ON) sensing via SENSE+/SENSE– inputs for lossless valley current detection. |
Pinout & Package
Package: 32-lead 5mm × 5mm QFN (UH), exposed pad (Pin 33) soldered to SGND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VON (Pin 2) | On-time voltage input | Sets comparator trip point for one-shot timer; tied to INTVCC for high-VOUT stability or grounded for default 0.7V threshold. |
| VRNG (Pin 3) | Sense voltage limit set | Programs nominal current sense threshold from 95mV (ground) to 215mV (INTVCC); determines maximum valley current limit. |
| PGOOD (Pin 4) | Open-drain power good output | Pulled low when VFB deviates >±10% from 0.8V for ≥120µs - provides system-level fault signaling to microcontrollers or sequencers. |
| MODE/SYNC (Pin 5) | Pulse skip enable / sync input | Pull <0.8V for forced continuous mode; apply external clock for synchronized switching to avoid EMI peaks in sensitive RF bands. |
| ITH (Pin 6) | Error amp compensation / current threshold | 0–2.6V control voltage sets valley current threshold; 1.2V = zero-current point - used for soft-start ramp and current foldback. |
| VFB (Pin 7) | Feedback input | Connects to resistor divider from VOUT; internal 0.8V reference enables precise output voltage setting (e.g., 12V via 14k/1k divider). |
| SS/TRACK (Pin 9) | Soft-start / tracking input | Capacitor to ground sets output ramp rate (~0.6s/µF); resistive divider connection enables ratiometric tracking of another supply rail. |
| SHDN (Pin 12) | Shutdown control | Pull <1.5V to disable both gate drivers and reduce quiescent current to 240µA - essential for system-level power sequencing. |
| UVIN (Pin 13) | Input undervoltage lockout | Resistive divider from VIN sets UVLO threshold; internal 0.8V reference with 10% hysteresis prevents brownout oscillation. |
| NDRV (Pin 14) | External pass device drive | Drives NMOS gate for linear regulator supplying INTVCC during startup or short-circuit - enables self-biasing without external LDO. |
| EXTVCC (Pin 15) | External driver supply | When ≥4.7V, powers INTVCC via internal LDO and disables NDRV path - improves efficiency in steady-state operation. |
| INTVCC (Pin 16) | Main internal supply | Bypassed with ≥0.1µF capacitor; powers all logic and analog circuits except gate drivers - critical for noise immunity. |
| DRVCC (Pin 17) | Bottom gate driver supply | Typically tied to INTVCC; bypassed to BGRTN with 1–10µF X5R capacitor - ensures stable low-side drive under high dI/dt. |
| BG (Pin 18) | Bottom gate driver output | Swings from BGRTN to DRVCC - drives source-connected NMOS switch; separate BGRTN pin allows negative return to suppress Miller turn-on. |
| BGRTN (Pin 19) | Bottom gate return | Connects to MOSFET source or negative supply - enables gate drive below ground to prevent false turn-on during high dV/dt at SW node. |
| SENSE– (Pin 20) | Current sense negative input | Kelvin connection to bottom MOSFET source or sense resistor - eliminates PCB trace resistance error in valley current measurement. |
| SENSE+ (Pin 24) | Current sense positive input | Connected to SW node for MOSFET RDS(ON) sensing or to sense resistor high side - completes differential current comparator path. |
| SW (Pin 25) | Switch node | Connects to inductor and bootstrap capacitor - voltage swings from –0.7V (Schottky drop) to VIN; defines timing reference for TG driver. |
| TG (Pin 26) | Top gate driver output | Floating driver referenced to SW - supplies gate drive to high-side NMOS; powered by BOOST capacitor charged via external Schottky diode. |
| BOOST (Pin 27) | Top gate driver supply | Bypassed to SW with 0.1µF X5R capacitor - forms charge-pump supply enabling true floating drive for high-side MOSFET. |
| ION (Pin 31) | On-time current input | Resistor from VIN sets one-shot timer current - directly programs switching frequency independent of input voltage variation. |
| SGND (Pin 33) | Signal ground | Exposed pad; must be soldered to PCB ground plane - serves as reference for all small-signal pins and minimizes noise coupling into EA/ITH. |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistor required | Uses MOSFET RDS(ON) sensing via SENSE+/SENSE– to eliminate power loss and board space of discrete sense resistors. |
| Programmable cycle-by-cycle current limit | VRNG pin adjusts maximum sense threshold from 95mV to 215mV - enables precise overcurrent protection tailored to MOSFET selection. |
| Adjustable minimum on-time <100ns | ION resistor and VON voltage jointly configure tON(MIN) - supports high input-to-output voltage ratios without frequency collapse. |
| Power good output with 120µs delay | PGOOD asserts low only after sustained ±10% VFB deviation - prevents false fault triggering during brief load transients. |
| Integrated bias control with auto-switching | Automatically selects EXTVCC or NDRV-derived INTVCC - ensures reliable gate drive during startup, regulation, and output short-circuit events. |
| Synchronizable to external clock | MODE/SYNC pin accepts external clock signal - eliminates beat frequencies and enables coordinated switching in multi-rail power systems. |
Applications
| Telecom Power Supply | Automotive ADAS ECU |
|---|---|
Use Scenario: 48V intermediate bus conversion to 12V/6A for optical line cards and remote radio units. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating output with 60V input tolerance and fast line transient response. Use Value: Eliminates pre-regulator stage, reduces BOM count by removing sense resistor, and maintains regulation during 48V battery load dump events. |
Use Scenario: High-reliability 12V→3.3V/5A conversion for radar processor and camera SoC in autonomous driving modules. IC Role / Device Role / Timing Role: Constant on-time controller delivering sub-100ns minimum on-time for stable 3.3V output from wide-input automotive battery (6–60V). Use Value: 0.5% reference accuracy ensures sensor ADC reference stability; PGOOD output interfaces directly with ASIL-B safety monitor ICs. |
| Industrial Base Station | Networking Switch ASIC Core |
Use Scenario: 54V backplane power conversion to 5V/10A for FPGA-based baseband processing units. IC Role / Device Role / Timing Role: Dual N-MOSFET synchronous controller with programmable pulse skip mode for efficiency optimization across 10%–100% load range. Use Value: 25MHz error amplifier enables <5µs load transient recovery; large 1Ω gate drivers support paralleled MOSFETs for high-current density layouts. |
Use Scenario: 12V→0.85V/40A VRM for high-performance switch ASIC requiring tight voltage regulation and low noise. IC Role / Device Role / Timing Role: Valley current mode controller with adjustable current limit and soft-start/track functionality for multi-rail power sequencing. Use Value: SS/TRACK pin enables ratiometric startup with auxiliary 1.8V rail; VRNG-adjustable current limit prevents inrush damage during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3812-5 | Same pinout and feature set but lower 4.2V INTVCC UVLO threshold vs. LTC3810IUH-5#TRPBF's 4.05V rising threshold; identical 60V max input and no-RSENSE architecture. | Optimized for systems where earlier INTVCC dropout is acceptable to extend operational window during brownout. | Select LTC3812-5 when tighter INTVCC UVLO hysteresis (0.1V vs. 0.12V) or marginally lower startup voltage is required. |
| MP2918GL-Z | Monolithic 60V buck converter (integrated MOSFETs) vs. controller-only LTC3810IUH-5#TRPBF; lacks programmable VRNG current limit and 100ns min on-time. | Suitable for space-constrained designs where integration outweighs flexibility; not viable for >10A or custom MOSFET selection. | Choose MP2918GL-Z only for cost-sensitive, medium-current (<8A), fixed-output applications where external MOSFET optimization is unnecessary. |
Compared with LTC3812-5, the LTC3810IUH-5#TRPBF offers higher INTVCC UVLO margin for robustness in noisy automotive environments; compared with MP2918GL-Z, it provides full design flexibility for high-current, high-efficiency, or thermally constrained implementations using discrete MOSFETs.
Availability
LTC3810IUH-5#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, automotive ADAS ECUs, and industrial base station systems requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC3810IUH-5#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 its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3810IUH-5#TRPBF belongs to Linear's high-voltage synchronous buck controller family, engineered for rugged 48V/60V input applications in telecom infrastructure, automotive electronics, and industrial automation where reliability under voltage transients is critical.
FAQ
What is the minimum on-time specification for the LTC3810IUH-5#TRPBF?
The LTC3810IUH-5#TRPBF has a guaranteed minimum on-time of less than 100ns when ION = 2000µA. This enables stable operation at high input-to-output voltage ratios (e.g., 48V→3.3V) without frequency collapse, making it suitable for direct 48V intermediate bus conversion in telecom and industrial systems.
Does the LTC3810IUH-5#TRPBF require an external current sense resistor?
No, the LTC3810IUH-5#TRPBF does not require an external current sense resistor. It supports lossless valley current sensing using the RDS(ON) of the bottom N-channel MOSFET via the SENSE+ and SENSE– pins, reducing power loss and PCB area while maintaining accurate cycle-by-cycle current limiting.
How does the LTC3810IUH-5#TRPBF handle startup and short-circuit conditions?
The LTC3810IUH-5#TRPBF uses integrated bias control that automatically switches between EXTVCC and NDRV-derived INTVCC. During startup or output short-circuit, it activates an external SOT23 NMOS via NDRV to generate gate drive power from VIN, ensuring reliable operation without external LDOs or bootstrap complications.
What is the purpose of the BGRTN pin on the LTC3810IUH-5#TRPBF?
The BGRTN pin on the LTC3810IUH-5#TRPBF provides a dedicated return path for the bottom gate driver. Connecting it to a negative supply (e.g., –2V) counteracts Miller capacitance-induced gate voltage rise during high dV/dt transitions at the SW node, preventing false turn-on and shoot-through in high-frequency, high-voltage synchronous buck designs.
Can the LTC3810IUH-5#TRPBF be synchronized to an external clock?
Yes, the LTC3810IUH-5#TRPBF can be synchronized to an external clock via the MODE/SYNC pin. When an external clock signal is applied, the internal phase-locked loop aligns the rising edge of the top gate signal to the clock's rising edge - essential for EMI reduction in noise-sensitive RF and datacom applications.
What is the operating junction temperature range for the LTC3810IUH-5#TRPBF?
The LTC3810IUH-5#TRPBF is rated for an operating junction temperature range of –40°C to 125°C. This I-grade specification ensures reliable performance in automotive engine compartments, industrial control cabinets, and outdoor telecom enclosures without derating under typical thermal management conditions.
LTC3810IUH-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- 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):
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3810IUH-5#TRPBF FAQ
1.How can I place an order for LTC3810IUH-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3810IUH-5#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 LTC3810IUH-5#TRPBF reliable?
The price and inventory of LTC3810IUH-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3810IUH-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3810IUH-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3810IUH-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3810IUH-5#TRPBF?
LTC3810IUH-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3810IUH-5#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 LTC3810IUH-5#TRPBF?
For technical support, including LTC3810IUH-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3810IUH-5#TRPBF requirements.
6.How does Aetrix verify that LTC3810IUH-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3810IUH-5#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 LTC3810IUH-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3810IUH-5#TRPBF?
All LTC3810IUH-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3810IUH-5#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 LTC3810IUH-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3810IUH-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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