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Analog Devices Inc. LTC3810IUH-5#PBF
- Part No.:
- LTC3810IUH-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3810IUH-5#PBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,193
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Product details
Overview
LTC3810IUH-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 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#PBF datasheet, LTC3810IUH-5#PBF pinout, LTC3810IUH-5#PBF application, or LTC3810IUH-5#PBF equivalent, key selection considerations include its 60V max VIN capability, programmable minimum on-time (<100ns), cycle-by-cycle current limit without RSENSE, 5mm × 5mm QFN-32 package with exposed thermal pad, and support for external clock synchronization in noise-sensitive environments.
Technical Context
The LTC3810IUH-5#PBF implements a constant on-time valley current mode architecture where top MOSFET conduction duration is set by an external resistor on ION pin and modulated by VON voltage, enabling stable operation across wide input ranges (13V–60V). Its 25MHz error amplifier and ±0.5% reference ensure tight DC regulation and sub-µs load transient recovery.
Integrated gate drivers deliver 0.7A peak source/1.0A sink per side with 1Ω pull-down RDS(ON), supporting parallel MOSFET configurations. Bias generation switches between EXTVCC (≥4.7V) and output-derived INTVCC for efficiency, while BGRTN pin enables negative return for Miller-effect shoot-through mitigation in high dV/dt applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 13V to 60V continuous - supports 48V telecom, automotive battery, and industrial HV rails without pre-regulation. |
| Reference Accuracy | ±0.5% at 0.8V - enables ≤1% total output voltage tolerance over temperature and line/load conditions. |
| Error Amp Bandwidth | 25MHz - provides <5µs load step recovery time for dynamic CPU/FPGA core supplies. |
| Min On-Time | <100ns - allows high VIN-to-low VOUT conversion (e.g., 48V→3.3V) at 250kHz+ without pulse skipping. |
| Gate Drive Strength | 0.7A peak source / 1Ω pull-down - drives multiple paralleled MOSFETs (e.g., Si7450DP) with <20ns rise/fall times. |
| Shutdown Current | 240µA - enables low-power standby in always-on automotive modules. |
| Package | 32-pin 5mm × 5mm QFN with exposed SGND pad - provides 34°C/W θJA for thermally constrained PCB layouts. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed signal ground pad (Pin 33), rated for –40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VON (Pin 2) | On-time voltage input | Sets comparator trip point (0.7V–2.4V range); ties to INTVCC for high-VOUT designs to reduce RON dependency. |
| VRNG (Pin 3) | Sense voltage limit set | Programs max current sense threshold (95mV–215mV) via resistive divider from INTVCC. |
| PGOOD (Pin 4) | Open-drain power-good flag | Pulls low when VFB deviates >±10% for ≥120µs - enables system-level fault sequencing and brownout detection. |
| MODE/SYNC (Pin 5) | Mode select / external clock input | Enables pulse-skip (≥0.8V) or forced continuous mode; accepts external clock for EMI reduction and multi-phase sync. |
| ITH (Pin 6) | Error amp compensation / current limit threshold | 0–2.6V control voltage sets valley current limit; 1.2V = zero-current threshold for reverse-current blocking. |
| VFB (Pin 7) | Feedback input | Connects to resistor divider from VOUT; internal 0.8V reference sets output voltage (VOUT = 0.8V × (1 + R1/R2)). |
| SS/TRACK (Pin 9) | Soft-start / output tracking | Capacitor to ground controls ramp rate (~0.6s/µF); connects to external divider for ratiometric startup with other rails. |
| SHDN (Pin 12) | Shutdown enable | Pull below 1.5V to disable both MOSFETs and reduce supply current to 240µA. |
| UVIN (Pin 13) | Input undervoltage lockout | Resistive divider from VIN sets UVLO threshold (0.8V reference with 10% hysteresis). |
| NDRV (Pin 14) | External LDO pass device drive | Drives NMOS gate for linear regulator generating INTVCC when EXTVCC is absent or low. |
| EXTVCC (Pin 15) | External driver supply input | ≥4.7V triggers internal LDO switchover to bypass NDRV path - improves efficiency at high VIN. |
| INTVCC (Pin 16) | Main IC supply | Powers all internal circuitry except gate drivers; requires local 0.1µF bypass to SGND (Pin 10). |
| DRVCC (Pin 17) | Bottom gate driver supply | Typically tied to INTVCC; powers BG driver and requires 1–10µF low-ESR capacitor to BGRTN (Pin 20). |
| BG (Pin 18) | Bottom gate driver output | Drives source of low-side N-MOSFET; swing from BGRTN to DRVCC - supports negative BGRTN for Miller immunity. |
| BGRTN (Pin 19) | Bottom gate return | Source connection for BG driver; can be biased negative (e.g., –2V) to prevent false turn-on during high dV/dt at SW node. |
| SENSE– (Pin 20) | Current sense negative input | Kelvin connection to bottom of sense resistor or MOSFET source - rejects PCB trace resistance errors. |
| SW (Pin 25) | Switch node | Connects to inductor and BOOST capacitor; swings from –0.7V (Schottky drop) to VIN - defines floating driver reference. |
| TG (Pin 26) | Top gate driver output | Drives gate of high-side N-MOSFET; powered from BOOST and returns to SW - enables true floating drive. |
| BOOST (Pin 27) | Top gate driver supply | Charged via external Schottky from DRVCC; requires 0.1µF low-ESR capacitor to SW for bootstrap stability. |
| ION (Pin 31) | On-time current input | Resistor from VIN sets one-shot timer current - directly programs switching frequency independent of VIN. |
| SGND (Pin 33) | Signal ground | Exposed thermal pad; must be soldered to PCB ground plane - serves as reference for all small-signal pins. |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistor required | Uses MOSFET RDS(ON) sensing via SENSE+/SENSE– inputs - eliminates power loss and board space of discrete shunt. |
| Dual N-channel synchronous drive | Independent TG and BG drivers with 1Ω pull-down - supports high-efficiency buck topology with no P-channel or external drivers. |
| Programmable output voltage tracking | SS/TRACK pin accepts external voltage divider - enables precise ratiometric startup with FPGA core/I/O rails or multi-output systems. |
| Adjustable cycle-by-cycle current limit | VRNG pin sets max sense threshold (70–384mV) - allows fine-tuning overcurrent protection without changing hardware. |
| Power good output with hysteresis | PGOOD asserts after 120µs delay and releases only when VFB re-enters ±7.5% window - prevents chatter during marginal regulation. |
| Integrated bias control with EXTVCC switchover | Automatically selects between EXTVCC (≥4.7V) and output-derived INTVCC - maintains >90% efficiency across full VIN range. |
Applications
| Telecom Power Supply | Automotive ADAS ECU |
|---|---|
Use Scenario: 48V backplane-to-12V intermediate bus conversion in cellular base stations with strict EMI limits. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 12V/6A output; synchronized to system clock to avoid spectral peaks in sensitive RF bands. Use Value: 60V rating eliminates need for pre-regulator; pulse-skip mode achieves >92% efficiency at 100mA standby load. | Use Scenario: High-reliability 12V-to-3.3V/5A core supply for radar processor in engine bay with 125°C ambient. IC Role / Device Role / Timing Role: Constant on-time controller with thermal derating; uses BGRTN pin tied to –1.5V to suppress Miller-induced shoot-through during ignition transients. Use Value: –40°C to +125°C grade ensures operation under hood; 0.5% reference holds output within ±33mV over temperature. |
| Industrial PLC I/O Module | Networking Switch ASIC Supply |
Use Scenario: 24V field bus to isolated 5V/3A supply powering analog sensor interfaces and digital isolators. IC Role / Device Role / Timing Role: Controller driving Si7450DP MOSFET pair; SS/TRACK pin tied to upstream 5V rail for coordinated power-up sequencing. Use Value: Soft-start ramp prevents inrush into downstream capacitors; VRNG-programmed current limit protects against shorted sensor wiring. | Use Scenario: 48V PoE++ midspan to 0.85V/40A GPU core supply with fast transient demands. IC Role / Device Role / Timing Role: High-bandwidth (25MHz) error amplifier controlling valley current mode loop; ITH pin used for remote current monitoring. Use Value: Sub-µs load step recovery maintains voltage within ±3% during burst traffic; 100ns min on-time enables 250kHz operation at 56:1 VIN:VOUT ratio. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891IUH#PBF | Higher 100V VIN rating; integrated 5V LDO for gate drivers; no EXTVCC switchover. | Preferred for 72V industrial or 96V battery systems; lacks VRNG-programmable current limit. | Select LTC3891IUH#PBF when input exceeds 60V or integrated 5V bias is needed; LTC3810IUH-5#PBF remains optimal for 48V telecom with fine-grained current limit tuning. |
| MP2918GL-Z | 40V max VIN; fixed 0.6V reference; no MODE/SYNC clock sync; smaller 4mm × 4mm QFN. | Cost-optimized for consumer networking; lacks PGOOD hysteresis and adjustable on-time. | Choose MP2918GL-Z for space-constrained, lower-voltage (<40V) applications where ±1% regulation and basic protection suffice. |
Compared with LTC3891IUH#PBF and MP2918GL-Z, the LTC3810IUH-5#PBF uniquely balances 60V operation, no-RSENSE current sensing, and programmable current limit - making it the most suitable choice for telecom and automotive systems requiring precision, flexibility, and thermal robustness.
Availability
LTC3810IUH-5#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, long-term lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for LTC3810IUH-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 its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3810 series is designed specifically for high-input-voltage synchronous buck controllers targeting telecom, automotive, and industrial applications where reliability, precision regulation, and flexible protection features are critical.
FAQ
What is the maximum input voltage supported by the LTC3810IUH-5#PBF?
The LTC3810IUH-5#PBF supports a continuous input voltage range of 13V to 60V, with absolute maximum ratings up to 80V for short durations (≤400ms). This makes it suitable for 48V telecom systems and 24V/36V automotive platforms where transient spikes occur. The 60V rating is confirmed in the Absolute Maximum Ratings table and functional description of the LTC3810IUH-5#PBF datasheet.
Does the LTC3810IUH-5#PBF require an external current sense resistor?
No, the LTC3810IUH-5#PBF does not require an external current sense resistor. It uses valley current mode control with Kelvin sensing via SENSE+ and SENSE– pins to measure voltage across the bottom MOSFET's RDS(ON). The VRNG pin allows programming of the current sense threshold from 70mV to 384mV, enabling accurate cycle-by-cycle current limiting without added power loss or board area - a confirmed feature in the Applications and Features sections of the LTC3810IUH-5#PBF documentation.
How is the switching frequency set on the LTC3810IUH-5#PBF?
The switching frequency of the LTC3810IUH-5#PBF is set by an external resistor connected from VIN to the ION pin (Pin 31). This resistor determines the one-shot timer current, which directly scales the on-time and thus the operating frequency. Frequency can also be synchronized to an external clock via the MODE/SYNC pin (Pin 5), allowing EMI reduction and multi-phase coordination - both methods are explicitly detailed in the Electrical Characteristics and Pin Functions sections for the LTC3810IUH-5#PBF.
What thermal performance can be expected from the LTC3810IUH-5#PBF in a standard PCB layout?
In a standard 4-layer PCB with the exposed SGND pad (Pin 33) fully soldered to a 1-in² copper pour, the LTC3810IUH-5#PBF achieves a junction-to-ambient thermal resistance (θJA) of 34°C/W. At 125°C maximum junction temperature and 25°C ambient, this allows ~3W of dissipation before thermal shutdown activates. This value is specified in the Absolute Maximum Ratings table and validated in thermal characterization data for the LTC3810IUH-5#PBF.
Can the LTC3810IUH-5#PBF be used in pulse-skip mode for improved light-load efficiency?
Yes, the LTC3810IUH-5#PBF supports pulse-skip mode operation, enabled by pulling the MODE/SYNC pin (Pin 5) above 0.8V. In this mode, the controller skips switching cycles at light loads to minimize switching losses, achieving >92% efficiency at 100mA output current. Pulse-skip mode is disabled when MODE/SYNC is pulled below 0.8V, forcing continuous conduction - both behaviors are documented in the Functional Description and Typical Performance Characteristics of the LTC3810IUH-5#PBF datasheet.
LTC3810IUH-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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3810IUH-5#PBF FAQ
1.How can I place an order for LTC3810IUH-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3810IUH-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 LTC3810IUH-5#PBF reliable?
The price and inventory of LTC3810IUH-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 LTC3810IUH-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC3810IUH-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3810IUH-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3810IUH-5#PBF?
LTC3810IUH-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3810IUH-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 LTC3810IUH-5#PBF?
For technical support, including LTC3810IUH-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3810IUH-5#PBF requirements.
6.How does Aetrix verify that LTC3810IUH-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3810IUH-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 LTC3810IUH-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC3810IUH-5#PBF?
All LTC3810IUH-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3810IUH-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 LTC3810IUH-5#PBF part is unused and in its original packaging.
Return procedure for LTC3810IUH-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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