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Analog Devices Inc. LTC3812EFE-5#TRPBF
- Part No.:
- LTC3812EFE-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3812EFE-5#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,035
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Product details
Overview
LTC3812EFE-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, 25MHz error amplifier bandwidth, and programmable frequency via external resistor - enabling high-efficiency telecom and automotive power supplies with no external current sense resistor required.
For engineers reviewing the LTC3812EFE-5#TRPBF datasheet, LTC3812EFE-5#TRPBF pinout, LTC3812EFE-5#TRPBF application, or LTC3812EFE-5#TRPBF equivalent, key selection criteria include its 60V max VIN capability, dual N-channel MOSFET drive architecture, integrated bias control for startup/short-circuit operation, and thermally enhanced 16-pin TSSOP package with exposed GND pad.
Technical Context
The LTC3812EFE-5#TRPBF implements a constant-on-time valley current mode control architecture that eliminates need for external current-sense resistors by using bottom MOSFET RDS(ON) as the sensing element. Its 25MHz error amplifier enables sub-microsecond load transient response, while adjustable on-time (tON(MIN) < 100ns) and cycle-by-cycle current limiting provide robust short-circuit protection.
Integrated gate drivers deliver 1Ω pull-down RDS(ON) and ≥0.7A peak source current per channel to drive large N-channel MOSFETs. Bias power is intelligently managed: startup and fault recovery use an external SOT-23 NMOS driven by NDRV; regulation uses output-derived INTVCC for higher efficiency. EXTVCC switchover at 4.7V enables seamless transition between input- and output-derived supply modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input Voltage | 60V continuous - supports 48V telecom, automotive battery, and industrial HVDC rails without external voltage dividers or regulators. |
| Reference Accuracy | ±0.5% over –40°C to 125°C - ensures stable 0.8V feedback threshold for tight output regulation across temperature and line/load conditions. |
| Error Amplifier BW | 25MHz - enables fast line/load transient response with minimal output voltage deviation during dynamic load steps. |
| Min On-Time | <100ns - allows high VIN-to-VOUT step-down ratios (e.g., 48V→3.3V) at practical switching frequencies without pulse skipping. |
| Gate Driver Strength | 1Ω pull-down RDS(ON), ≥0.7A peak source - reduces MOSFET switching losses and supports paralleled FETs for >20A applications. |
| Operating Temp Range | –40°C to 125°C junction - qualified for under-hood automotive and base station environments with thermal shutdown protection. |
| Package | 16-pin TSSOP with exposed GND pad - provides 38°C/W θJA for reliable high-power operation without heatsinks in compact layouts. |
Pinout & Package
Package: 16-lead plastic TSSOP (FE), thermally enhanced with exposed GND pad (Pin 17) requiring PCB soldering for thermal and electrical integrity.
| 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 for constant-on-time operation. |
| VRNG (2) | Sense Voltage Limit Set | Configures maximum current sense threshold (60–320mV) via resistive divider; enables accurate cycle-by-cycle current limit without external resistor. |
| PGOOD (3) | Power Good Output | Open-drain signal pulled low when VFB deviates >±10% from 0.8V for ≥120μs - provides system-level power sequencing and fault indication. |
| FCB (4) | Pulse-Skipping Mode Enable | Logic-controlled mode selection: <0.8V forces continuous conduction; >0.8V enables light-load efficiency optimization via pulse skipping. |
| ITH (5) | Error Amp Compensation / Current Threshold | Compensation node and valley current comparator threshold; voltage range 0–2.6V maps directly to inductor current setpoint. |
| VFB (6) | Feedback Input | Connects to resistor divider from VOUT; internal 0.8V reference enables precise output voltage programming (e.g., 5V, 3.3V, 1.2V). |
| RUN/SS (7) | Run Control / Soft-Start | Pull below 1.2V to shut down (IQ < 230μA); capacitor to ground sets soft-start ramp rate (~0.6s/μF) to limit inrush current. |
| SGND (8) | Signal Ground | Reference for all small-signal pins (VFB, ITH, RUN/SS); must connect to PGND at single point to avoid noise coupling. |
| NDRV (9) | External Pass Device Drive | Drives gate of external NMOS for linear regulator generating INTVCC during startup/short-circuit - enables fast IC supply charging. |
| EXTVCC (10) | External Driver Supply | Accepts 4.35–15V supply; automatically switches INTVCC source from EXTVCC when >4.7V, bypassing internal LDO for higher efficiency. |
| INTVCC (11) | Main Supply & Driver Rail | 4.35–14V supply for internal circuitry and BG driver; requires local 1μF X5R bypass to SGND/PGND for stability. |
| BG (12) | Bottom Gate Drive | Drives source of bottom N-MOSFET; swings from PGND to INTVCC with 1Ω pull-down for fast turn-off and low conduction loss. |
| PGND (13) | Bottom Gate Return | Source connection for BG driver and bottom MOSFET; forms low-impedance return path for high di/dt currents. |
| SW (14) | Switch Node | Connection to inductor and BOOST capacitor; voltage swings from ~–0.3V (Schottky drop) to VIN - critical for layout EMI control. |
| TG (15) | Top Gate Drive | Floating driver for top N-MOSFET gate; powered from BOOST, returns to SW - enables true high-side drive without bootstrap timing constraints. |
| BOOST (16) | Top Gate Driver Supply | Charged via external Schottky diode from INTVCC to SW; requires 0.1μF X5R capacitor to SW for stable floating rail generation. |
| GND (17) | Exposed Pad | Thermal and electrical ground; must be soldered to PCB copper pour for thermal dissipation (θJA = 38°C/W) and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| No external current sense resistor | Uses bottom MOSFET RDS(ON) for valley current sensing - eliminates power loss, board space, and cost of discrete sense resistor. |
| Programmable minimum on-time | tON(MIN) < 100ns set by ION pin - enables high VIN/VOUT ratios (e.g., 48V→1.2V) at 250kHz without duty cycle limitation. |
| Integrated bias control with NMOS support | NDRV pin drives external SOT-23 NMOS to generate 5.5V startup supply - achieves fast start-up vs. trickle-charge alternatives. |
| Output overvoltage protection | OV comparator disables top MOSFET and latches bottom MOSFET on during overvoltage - prevents damage to downstream loads during regulation failure. |
| Selectably forced continuous or pulse-skipping mode | FCB pin toggles between fixed-frequency operation (better transients) and variable-frequency light-load mode (higher efficiency) - configurable per system needs. |
| Thermally enhanced TSSOP package | Exposed GND pad reduces thermal resistance to 38°C/W - sustains full 125°C junction temperature in compact 5mm × 6mm footprint. |
Applications
| 48V Telecom Power Supply | Automotive ADAS Power Module |
|---|---|
Use Scenario: Generating isolated 5V/3.3V rails from 48V vehicle battery for radar, camera, and domain controllers in harsh automotive environments. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-side/low-side N-MOSFETs, providing precise 0.8V reference and fast transient response to handle pulsed radar loads. Use Value: 60V absolute max VIN withstands load-dump transients up to 65V; ±0.5% reference ensures stable ADC reference and sensor biasing across temperature. | Use Scenario: Non-isolated 12V→3.3V conversion for infotainment SoCs requiring low-noise, high-efficiency power with automotive-grade reliability. IC Role / Device Role / Timing Role: Constant-on-time valley current mode controller delivering cycle-by-cycle current limiting and PGOOD signaling for functional safety compliance. Use Value: Programmable soft-start (RUN/SS) controls inrush during cold-cranking; thermal shutdown protects against under-hood overheating. |
| Industrial PLC I/O Power | Base Station RF Power Amplifier Bias |
Use Scenario: Distributed 24V→5V/12V conversion in programmable logic controllers where long cable runs cause significant input voltage drop and ripple. IC Role / Device Role / Timing Role: High-bandwidth (25MHz) error amplifier compensates for line variations and maintains regulation during 10A load steps. Use Value: Adjustable VRNG pin sets current limit to match field-wiring resistance; EXTVCC support enables local 5V supply for noise-sensitive analog sections. | Use Scenario: Bias supply for GaN RF power amplifiers requiring tightly regulated 28V output from 48V backplane with minimal output ripple. IC Role / Device Role / Timing Role: Synchronous buck controller driving high-current N-MOSFETs with 1Ω gate drivers to minimize switching losses at 200kHz–1MHz. Use Value: Large 1Ω gate drivers reduce MOSFET gate charge time; BOOST/TG architecture ensures robust high-side drive even during deep load transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GQ-Z | 40V max VIN, integrated MOSFETs, fixed 500kHz frequency, no VRNG pin for current limit adjustment | Targeted at lower-voltage consumer/industrial apps; lacks 60V rating and programmable current limit for telecom/automotive | Choose MP2918GQ-Z only if input ≤40V and integrated FETs are acceptable; not suitable for 48V telecom or load-dump survival. |
| LTC3891IFE-5#TRPBF | 60V input, dual-output, includes built-in LDO for bias supply, same pinout but adds second channel and EXTVCC regulation | Designed for multi-rail systems (e.g., 5V + 3.3V); higher BOM cost and complexity for single-output needs | Choose LTC3891IFE-5#TRPBF when dual outputs or integrated bias LDO are required; otherwise LTC3812EFE-5#TRPBF offers simpler, lower-cost single-channel solution. |
Compared with MP2918GQ-Z, LTC3812EFE-5#TRPBF supports 60V input and adjustable current limit for ruggedized telecom/automotive use; compared with LTC3891IFE-5#TRPBF, it provides identical core control functionality at lower cost and smaller footprint for single-output designs.
Availability
LTC3812EFE-5#TRPBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, automotive ADAS modules, and industrial PLC I/O power systems requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3812EFE-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 full product support, documentation, and manufacturing continuity for all Linear parts including the LTC3812 series.
The LTC3812 family is designed as high-voltage synchronous buck controllers targeting telecom, automotive, and industrial DC/DC conversion where input voltages reach 60V and reliability under transient stress is critical.
FAQ
What is the maximum input voltage rating for the LTC3812EFE-5#TRPBF?
The LTC3812EFE-5#TRPBF has a maximum continuous input voltage rating of 60V, with absolute maximum ratings up to 70V for short durations (≤400ms). This makes it suitable for 48V telecom systems and automotive applications where load-dump transients can exceed 60V. The device incorporates undervoltage lockout and overvoltage protection to safeguard both itself and downstream circuitry during abnormal input conditions.
Does the LTC3812EFE-5#TRPBF require an external current sense resistor?
No, the LTC3812EFE-5#TRPBF 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 sensing element, measuring the voltage between PGND and SW pins. The VRNG pin allows precise setting of the maximum sense voltage (60–320mV), enabling accurate cycle-by-cycle current limiting without added component cost or power loss.
How is the switching frequency programmed on the LTC3812EFE-5#TRPBF?
The switching frequency of the LTC3812EFE-5#TRPBF is programmed by connecting an external resistor (RON) between VIN and the ION pin (Pin 1). The on-time is proportional to this current, and the resulting frequency remains stable across input voltage variations due to internal compensation. Typical values range from 100kΩ (≈250kHz) to 1MΩ (≈50kHz), with tON(MIN) < 100ns supporting high VIN/VOUT ratios.
What package type and thermal characteristics does the LTC3812EFE-5#TRPBF use?
The LTC3812EFE-5#TRPBF uses a 16-lead plastic TSSOP (FE package) with an exposed GND pad (Pin 17). This thermally enhanced package achieves a junction-to-ambient thermal resistance (θJA) of 38°C/W when properly soldered to a 2-layer PCB with 1in² copper pour. The exposed pad must be electrically and thermally connected to PCB ground for optimal performance and reliability at full 125°C junction temperature.
Can the LTC3812EFE-5#TRPBF operate in pulse-skipping mode, and how is it enabled?
Yes, the LTC3812EFE-5#TRPBF supports pulse-skipping mode for improved light-load efficiency. It is enabled by pulling the FCB pin (Pin 4) above 0.8V - typically via a resistor divider from INTVCC or a secondary winding. When active, the controller skips switching cycles at light loads, reducing switching losses. Pulling FCB below 0.8V forces continuous conduction mode for better transient response and constant frequency operation.
LTC3812EFE-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) 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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3812EFE-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3812EFE-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 LTC3812EFE-5#TRPBF reliable?
The price and inventory of LTC3812EFE-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 LTC3812EFE-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3812EFE-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3812EFE-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3812EFE-5#TRPBF?
LTC3812EFE-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3812EFE-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 LTC3812EFE-5#TRPBF?
For technical support, including LTC3812EFE-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3812EFE-5#TRPBF requirements.
6.How does Aetrix verify that LTC3812EFE-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3812EFE-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 LTC3812EFE-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3812EFE-5#TRPBF?
All LTC3812EFE-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3812EFE-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 LTC3812EFE-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3812EFE-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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