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Analog Devices Inc. LTC3812EFE-5#PBF
- Part No.:
- LTC3812EFE-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3812EFE-5#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,731
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Product details
Overview
LTC3812EFE-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, delivering ±0.5% DC output voltage accuracy at 0.8V reference, 25MHz error amplifier bandwidth, and programmable frequency via external resistor - ideal for 48V telecom power supplies and automotive high-voltage DC/DC conversion.
For engineers reviewing the LTC3812EFE-5#PBF datasheet, LTC3812EFE-5#PBF pinout, LTC3812EFE-5#PBF application, or LTC3812EFE-5#PBF equivalent, key selection criteria include its 60V max VIN capability, no external sense resistor requirement, dual N-channel MOSFET drive architecture, 16-pin TSSOP thermally enhanced package, and integrated bias control for startup and short-circuit resilience.
Technical Context
The LTC3812EFE-5#PBF implements a constant on-time valley current control architecture that eliminates need for a discrete current sense resistor by leveraging bottom MOSFET RDS(ON) for sensing. Its 25MHz error amplifier enables sub-microsecond load transient response, while adjustable minimum on-time (<100ns) supports ultra-low duty cycles required for high-input-to-low-output voltage conversion.
Integrated gate drivers deliver 1Ω pull-down RDS(ON) and ≥0.7A peak source current per driver, enabling direct drive of large discrete N-channel MOSFETs. Bias supply generation switches automatically between EXTVCC, INTVCC, and NDRV-controlled external NMOS to maintain 5.5V driver rail across startup, regulation, and fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input Voltage | 60V - supports direct connection to 48V telecom or 36V automotive battery rails without pre-regulation. |
| Reference Voltage Accuracy | ±0.5% at 0.8V - ensures tight output regulation over temperature and line/load variation. |
| Error Amplifier Bandwidth | 25MHz - delivers fast line and load transient response with minimal output deviation. |
| Min On-Time | <100ns - enables stable operation at high VIN/VOUT ratios (e.g., 48V→3.3V). |
| Gate Driver Strength | 1Ω pull-down RDS(ON), ≥0.7A peak source - drives large Qg MOSFETs with low switching loss. |
| Operating Temp Range | –40°C to +125°C - qualified for under-hood automotive and industrial base station environments. |
| Shutdown Current | <230μA - enables ultra-low power-off state for system-level energy management. |
Pinout & Package
Package: 16-lead plastic TSSOP with exposed pad (Pin 17 = GND), thermally enhanced for high-power density applications. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ION (1) | On-Time Current Input | Sets switching frequency via external resistor from VIN; determines one-shot timer current. |
| VRNG (2) | Sense Voltage Limit Set | Configures maximum current sense threshold (60–320mV) via resistive divider from INTVCC. |
| PGOOD (3) | Power Good Output | Open-drain flag asserting when VOUT deviates >±10% from regulation point for ≥120μs. |
| FCB (4) | Pulse-Skipping Mode Enable | Logic input selecting forced continuous (FCB < 0.8V) or pulse-skipping (FCB > 0.8V) operation. |
| ITH (5) | Error Amp Compensation / Current Threshold | Voltage sets valley current limit; 1.2V = zero current, scales linearly to 2.6V. |
| VFB (6) | Feedback Input | Connects to resistor divider from VOUT; regulates output via internal 0.8V reference. |
| RUN/SS (7) | Run Control / Soft-Start | Pull <1.5V shuts down controller; capacitor to ground sets soft-start ramp rate (~0.6s/μF). |
| SGND (8) | Signal Ground | Reference for all small-signal pins; must connect to PGND at single point to avoid noise coupling. |
| NDRV (9) | External Pass Device Drive | Drives gate of external NMOS for INTVCC linear regulator during startup or short-circuit. |
| EXTVCC (10) | External Driver Supply | When >4.2V, powers INTVCC via internal LDO and disables NDRV-driven regulator. |
| INTVCC (11) | Main IC & Driver Supply | Provides power to internal circuitry and BG driver; bypass with 1μF X5R capacitor to SGND/PGND. |
| BG (12) | Bottom Gate Drive | Drives gate of bottom N-MOSFET; swings from PGND to INTVCC with 1Ω pull-down. |
| PGND (13) | Bottom Gate Return | Source node of BG driver; connects to source of bottom MOSFET and system power ground. |
| SW (14) | Switch Node | Connects to inductor and BOOST capacitor; voltage swings from ~–0.3V to VIN. |
| TG (15) | Top Gate Drive | Drives gate of top N-MOSFET; floating driver powered from BOOST, returns to SW. |
| BOOST (16) | Top Gate Driver Supply | Supplies TG driver; bypassed to SW with 0.1μF X5R capacitor; charged via Schottky from INTVCC. |
| GND (17) | Exposed Pad Ground | Thermal and electrical ground; must be soldered to PCB ground plane for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| No external current sense resistor | Uses bottom MOSFET RDS(ON) for valley current sensing - reduces BOM count and board space. |
| Programmable minimum on-time | <100ns setting enables stable 48V→3.3V conversion without duty cycle limitation. |
| Dual-mode operation (pulse-skipping/forced continuous) | FCB pin selects light-load efficiency (pulse-skipping) or consistent transient response (continuous). |
| Integrated bias supply control | Automatically selects between EXTVCC, NDRV-driven NMOS, or trickle-charge for robust startup and fault recovery. |
| Output overvoltage protection | Immediately disables top MOSFET and enables bottom MOSFET upon OVP detection - prevents downstream damage. |
| Thermally enhanced TSSOP | 16-pin package with exposed pad (θJA = 38°C/W) supports >5A output designs without heatsink. |
Applications
| Telecom Power Supply | Automotive ADAS ECU |
|---|---|
Use Scenario: 48V intermediate bus conversion to 3.3V/5V for baseband processors and RF front-ends in 5G macro base stations. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating isolated 48V telecom rail with cycle-by-cycle current limiting for short-circuit survivability. Use Value: 60V absolute max rating and no sense resistor enable compact, high-efficiency design meeting GR-1089 immunity requirements. | Use Scenario: High-voltage DC/DC conversion in autonomous driving ECUs where input may swing from 5V (cold crank) to 42V (load dump). IC Role / Device Role / Timing Role: Main step-down controller powering SoC core rails with fast transient response to handle burst-mode AI accelerator loads. Use Value: 25MHz error amplifier and <100ns min on-time ensure <10mV output deviation during 2A/μs load steps. |
| Industrial PLC I/O Module | Networking Switch ASIC Supply |
Use Scenario: Distributed 24V-to-12V/5V conversion across modular I/O cards in factory automation systems. IC Role / Device Role / Timing Role: Synchronous buck controller providing regulated auxiliary rails with PGOOD monitoring for system health reporting. Use Value: Integrated PGOOD with ±10% window and 120μs delay enables reliable power sequencing and watchdog integration. | Use Scenario: Point-of-load regulation for 12V backplane-fed switch ASICs requiring precise 0.8V core voltage at up to 60A. IC Role / Device Role / Timing Role: High-current buck controller driving paralleled MOSFETs with 1Ω gate drivers and scalable current limit via VRNG pin. Use Value: Adjustable current sense threshold (60–320mV) allows optimization of RDS(ON) tradeoff between conduction loss and noise immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EFE#PBF | Wider 4–60V input range; includes integrated 5V/1A bias supply; higher quiescent current (1.2mA vs 3mA active). | Eliminates need for external NDRV NMOS but increases solution size; better suited for systems lacking dedicated bias rail. | Select LTC3891EFE#PBF when bias supply integration outweighs cost and footprint impact. |
| MP2918GL-Z | Lower 4–40V input range; fixed 600kHz frequency; no VRNG-adjustable current limit; smaller 12-pin QFN package. | Targeted at cost-sensitive consumer networking; lacks pulse-skipping mode and programmable min on-time. | Select MP2918GL-Z only for ≤40V applications where simplified feature set and lower unit cost are prioritized. |
Compared with LTC3812EFE-5#PBF, LTC3891EFE#PBF adds integrated bias generation at higher IQ cost, while MP2918GL-Z sacrifices 60V capability and flexibility for compactness and price - making LTC3812EFE-5#PBF optimal for high-reliability 48V+ systems requiring full configurability.
Availability
LTC3812EFE-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 across extended temperature and high-voltage operating conditions.
Supply support for LTC3812EFE-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, 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 LTC3812EFE-5#PBF belongs to ADI's Power by Linear™ family of high-voltage DC/DC controllers, designed specifically for robust, high-efficiency step-down conversion in telecom, automotive, and industrial infrastructure where input voltages exceed 40V.
FAQ
What is the maximum input voltage supported by the LTC3812EFE-5#PBF?
The LTC3812EFE-5#PBF supports a maximum input voltage of 60V, verified in Absolute Maximum Ratings and confirmed across Electrical Characteristics tables. This enables direct interface with 48V telecom systems and automotive 36V nominal buses including load-dump transients. Operation above 60V risks permanent damage per datasheet Note 1.
Does the LTC3812EFE-5#PBF require an external current sense resistor?
No, the LTC3812EFE-5#PBF does not require an external current sense resistor. It uses the on-resistance (RDS(ON)) of the external bottom N-channel MOSFET as the current sense element, as explicitly stated in the DESCRIPTION and FEATURES sections. The VRNG pin configures the maximum sense voltage threshold (60–320mV) accordingly.
How is the switching frequency programmed on the LTC3812EFE-5#PBF?
The switching frequency of the LTC3812EFE-5#PBF is programmed via an external resistor (RON) connected from the ION pin to VIN. The on-time is proportional to this current, and frequency varies inversely with RON value. Typical values range from 100kΩ to 1MΩ, yielding frequencies from ~100kHz to ~1MHz depending on input/output conditions.
What protection features are integrated into the LTC3812EFE-5#PBF?
The LTC3812EFE-5#PBF integrates cycle-by-cycle current limiting, output overvoltage protection (OVP), undervoltage lockout (UVLO) on INTVCC, PGOOD monitoring with ±10% window and 120μs delay, foldback current limiting during short-circuit, and thermal shutdown. These are documented in the Fault Monitoring/Protection section and Electrical Characteristics table.
What package type and thermal characteristics does the LTC3812EFE-5#PBF use?
The LTC3812EFE-5#PBF uses a 16-lead plastic TSSOP package with exposed pad (FE package), specified in ORDER INFORMATION and ABSOLUTE MAXIMUM RATINGS. Its thermal resistance is θJA = 38°C/W when the exposed pad (Pin 17) is soldered to PCB ground, enabling operation up to +125°C junction temperature in properly laid-out designs.
LTC3812EFE-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) 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:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LTC3812EFE-5#PBF FAQ
1.How can I place an order for LTC3812EFE-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3812EFE-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 LTC3812EFE-5#PBF reliable?
The price and inventory of LTC3812EFE-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 LTC3812EFE-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC3812EFE-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3812EFE-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3812EFE-5#PBF?
LTC3812EFE-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3812EFE-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 LTC3812EFE-5#PBF?
For technical support, including LTC3812EFE-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3812EFE-5#PBF requirements.
6.How does Aetrix verify that LTC3812EFE-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3812EFE-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 LTC3812EFE-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC3812EFE-5#PBF?
All LTC3812EFE-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3812EFE-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 LTC3812EFE-5#PBF part is unused and in its original packaging.
Return procedure for LTC3812EFE-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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