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Analog Devices Inc. LTC3864EMSE#TRPBF
- Part No.:
- LTC3864EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3864EMSE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:17,384
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Product details
Overview
LTC3864EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, peak current-mode synchronous step-down DC/DC controller driving an external P-channel MOSFET. It supports 3.5V–60V input, 0.8V–VIN output, 100% duty cycle dropout operation, 40µA Burst Mode quiescent current, and programmable 50kHz–850kHz switching frequency. It is used in automotive power supplies where wide VIN range and low-IQ regulation are critical.
For engineers reviewing the LTC3864EMSE#TRPBF datasheet, LTC3864EMSE#TRPBF pinout, LTC3864EMSE#TRPBF application, or LTC3864EMSE#TRPBF equivalent, key selection criteria include verified FMEA-compliant adjacent-pin fault tolerance, ±10% PGOOD accuracy with 100µs delay, 95mV current sense threshold, 8V gate bias LDO (VIN–VCAP), and MSOP-12 thermal performance (θJA = 40°C/W).
Technical Context
The LTC3864EMSE#TRPBF implements a constant-frequency, peak current-mode control architecture with slope compensation, enabling precise current limiting and stable loop response across wide input/output ranges. Its error amplifier (Gm = 1.8 mS) drives the ITH node to set peak inductor current, while the internal 20µA current source on FREQ enables resistor-programmed oscillator frequency.
It integrates a dedicated gate driver bias LDO (VIN–VCAP regulated to 8V), supports both Burst Mode (40µA IQ) and pulse-skipping light-load operation via PLLIN/MODE pin configuration, and features frequency foldback (to ~18% of setpoint) triggered by VFB < 0.4V for short-circuit protection - all verified under FMEA analysis for adjacent-pin open/short faults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports cold-crank (≥3.5V) and load-dump (≤60V) conditions in automotive systems |
| Output Voltage Range | 0.8V to VIN - enables true dropout operation and flexible post-regulation |
| Quiescent Current (Burst Mode) | 40µA - sustains >1000-hour battery standby in always-on automotive modules |
| Switching Frequency Range | 50kHz to 850kHz - adjustable via external resistor on FREQ pin for EMI optimization |
| Current Sense Threshold | 95mV (typ) - sets accurate peak inductor current limit independent of temperature drift |
| PGOOD Accuracy | ±10% window around 0.8V reference - provides reliable system power sequencing and fault detection |
| Gate Driver Bias (VIN–VCAP) | 8.0V (typ) - ensures strong turn-on of high-threshold P-MOSFETs with low RDS(on) loss |
| Thermal Resistance (θJA) | 40°C/W - achieved via exposed PGND pad soldered to PCB, enabling 2A+ continuous output at 125°C ambient |
Pinout & Package
Package: 12-lead plastic MSOP with exposed PGND pad (pin 13); requires soldering of exposed pad for thermal and electrical integrity per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PLLIN/MODE | External clock sync input / Burst Mode enable | Floating enables 40µA Burst Mode; grounded selects pulse-skipping; driven by 75–750kHz external clock for phase alignment |
| 2 - FREQ | Oscillator frequency programming | 20µA current source sets frequency via external resistor; ground = 350kHz, open = 535kHz |
| 3 - SGND | Analog signal ground reference | Must be connected to PGND at single point only to prevent noise coupling into feedback loop |
| 4 - SS | Soft-start and tracking input | Internal 10µA pull-up charges external capacitor; voltage ≤0.8V forces VFB to track SS for controlled ramp-up |
| 5 - VFB | Feedback voltage sense | Regulated to 0.800V (±1%); ±10% PGOOD window triggers open-drain output after 100µs delay |
| 6 - ITH | Error amplifier output / current threshold | 0–2.9V range maps to 0–100% current limit; used for loop compensation and current monitoring |
| 7 - PGOOD | Power-good status indicator | Open-drain output pulled low if VFB outside ±10% or RUN = low; requires external pull-up ≤6V |
| 8 - RUN | Enable/disable control | 1.26V threshold with 150mV hysteresis; internal 0.4µA pull-up allows direct connection to 60V supply |
| 9 - CAP | GATE driver bias supply return | Requires ≥0.47µF ceramic cap between VIN and CAP; forms LDO filter for stable 8V gate drive |
| 10 - SENSE | Current sense differential input | Kelvin-connected to RSENSE; 95mV threshold sets peak current limit (IOUT ≈ 0.095/RSENSE) |
| 11 - VIN | Main power supply input | Supplies internal circuitry and gate driver LDO; requires ≥0.1µF local bypass to PGND |
| 12 - GATE | P-channel MOSFET gate driver output | Drives external P-MOSFET; disabled when (VIN–VCAP) < 3.25V to prevent weak turn-on |
| 13 - PGND | Power ground (exposed pad) | Mandatory solder connection to PCB ground plane for thermal dissipation (θJC = 10°C/W) and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-verified adjacent-pin fault tolerance | Guaranteed safe operation during open/short faults between any two pins - validated for automotive ASIL-B readiness |
| 100% duty cycle capability | Enables seamless transition to dropout mode when VIN drops below VOUT - eliminates output collapse in brownout |
| Programmable soft-start or output tracking | SS pin supports either capacitor-ramped startup or resistor-divider-based voltage tracking for multi-rail sequencing |
| Frequency foldback under overload | Reduces switching frequency to ~18% of setpoint when VFB < 0.4V - limits average current during short-circuit without sacrificing peak limit accuracy |
| Low shutdown IQ (7µA) | Minimizes battery drain during system sleep modes - critical for telematics and ADAS always-on subsystems |
| Strong gate driver with 8V bias LDO | Delivers robust turn-on drive to high-VGS(th) P-MOSFETs while maintaining efficiency across 5V–60V input range |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 5V/2A core logic and USB peripherals in head-unit systems with 9V–16V battery input and load-dump transients up to 60V. IC Role / Device Role / Timing Role: Primary step-down controller regulating 5V rail from unregulated automotive battery; manages 100% duty cycle during cranking (VIN ≈ 6V). Use Value: 40µA Burst Mode IQ extends battery life during vehicle-off state; FMEA validation ensures functional safety compliance in ASIL-B domains. |
Use Scenario: Generating isolated 3.3V/1A auxiliary supply from 24V industrial bus in programmable logic controllers with wide ambient temperature range. IC Role / Device Role / Timing Role: High-efficiency buck controller driving external P-MOSFET; operates continuously at –40°C to 125°C junction temperature. Use Value: 40°C/W θJA and exposed PGND pad enable full 2A output without derating; ±10% PGOOD ensures reliable watchdog and reset signaling. |
| Telecom Remote Radio Unit (RRU) | Distributed Power Architecture |
Use Scenario: Intermediate 12V bus conversion from 48V telecom supply in outdoor base station equipment subject to thermal cycling and humidity. IC Role / Device Role / Timing Role: Constant-frequency PWM controller synchronizing to system clock via PLLIN/MODE pin to reduce EMI in dense RF environments. Use Value: 75–750kHz PLL lock range enables precise frequency alignment; 8V gate bias ensures fast P-MOSFET switching at high ambient temperatures. |
Use Scenario: Point-of-load regulation for FPGA or ASIC cores requiring tightly regulated 0.85V–1.2V rails with dynamic load steps up to 10A/µs. IC Role / Device Role / Timing Role: Asynchronous buck controller with programmable soft-start (SS pin) to coordinate power-up sequencing across multiple POL converters. Use Value: ITH pin accessibility enables real-time current monitoring; 95mV current sense threshold delivers ±3% current limit accuracy over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3892EMSE#TRPBF | Dual-output, 60V input, 3.5µA shutdown IQ, integrated MOSFET drivers for N-channel high-side switch | Supports dual-rail generation and higher efficiency with N-MOSFETs; lacks 100% duty cycle capability | Select for multi-output designs needing lower IQ shutdown and N-MOSFET compatibility; not drop-in due to different topology and pinout |
| MP24894GQKT-Z | Monolithic 60V buck converter (integrated MOSFETs), 30µA IQ, fixed 100kHz–2.2MHz frequency, no PLL sync or FMEA validation | Lower BOM count but limited to ≤3A output; no 100% duty cycle or automotive-grade fault coverage | Select for cost-sensitive, space-constrained applications where monolithic integration outweighs need for FMEA or 100% duty cycle |
Compared with LTC3864EMSE#TRPBF, LTC3892EMSE#TRPBF offers dual outputs and N-MOSFET support but sacrifices 100% duty cycle and adds complexity, while MP24894GQKT-Z reduces component count at the expense of design flexibility, fault resilience, and dropout capability.
Availability
LTC3864EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC power modules, and telecom remote radio units requiring stable component supply across extended temperature and voltage stress conditions.
Supply support for LTC3864EMSE#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors for precision, reliability, and ruggedness-critical applications.
The LTC3864 belongs to Linear's high-voltage DC/DC controller product line, designed specifically for automotive, industrial, and telecom power systems demanding wide VIN range, ultra-low IQ, FMEA-compliant fault handling, and 100% duty cycle operation.
FAQ
What is the maximum input voltage rating for the LTC3864EMSE#TRPBF?
The LTC3864EMSE#TRPBF has an absolute maximum input supply voltage (VIN) rating of 65V, with guaranteed operational range from 3.5V to 60V. This 60V upper limit accommodates automotive load-dump transients and industrial 48V bus surges while maintaining reliable control loop stability and gate driver functionality throughout the range.
Does the LTC3864EMSE#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3864EMSE#TRPBF supports true 100% duty cycle operation. When input voltage drops below the programmed output voltage, the controller maintains regulation by holding the external P-channel MOSFET fully on - enabled by its architecture that does not require a bootstrap capacitor or minimum off-time. This behavior is confirmed in the dropout waveform figures and functional description of the datasheet.
How is light-load efficiency achieved in the LTC3864EMSE#TRPBF?
The LTC3864EMSE#TRPBF achieves light-load efficiency via selectable Burst Mode operation, drawing only 40µA quiescent current. In this mode, the controller discontinuously pulses the gate driver while maintaining output regulation using energy stored in the output capacitor. The ITH pin disconnects from the error amplifier below 0.425V, reducing internal bias currents and enabling microamp-level standby consumption.
What package type and thermal characteristics apply to the LTC3864EMSE#TRPBF?
The LTC3864EMSE#TRPBF uses a 12-lead plastic MSOP package with an exposed PGND pad (pin 13). Its thermal resistance is θJA = 40°C/W and θJC = 10°C/W when the exposed pad is properly soldered to a PCB ground plane. This construction enables continuous 2A output at 125°C ambient without forced airflow, as validated in the datasheet's thermal performance section.
Is the LTC3864EMSE#TRPBF validated for automotive functional safety requirements?
Yes, the LTC3864EMSE#TRPBF has undergone Failure Modes and Effects Analysis (FMEA) verification for adjacent-pin open and short faults - a key requirement for ASIL-B automotive systems. While not ISO 26262-certified out-of-box, its FMEA-compliant design, wide temperature range (–40°C to 125°C), and robust protection features (PGOOD, OV, frequency foldback) make it suitable for safety-critical power stages in infotainment and body electronics.
LTC3864EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm 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):
- 3.5V ~ 60V
- Frequency - Switching:
- 50kHz ~ 850kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3864EMSE#TRPBF FAQ
1.How can I place an order for LTC3864EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3864EMSE#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 LTC3864EMSE#TRPBF reliable?
The price and inventory of LTC3864EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3864EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3864EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3864EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3864EMSE#TRPBF?
LTC3864EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3864EMSE#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 LTC3864EMSE#TRPBF?
For technical support, including LTC3864EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3864EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3864EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3864EMSE#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 LTC3864EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3864EMSE#TRPBF?
All LTC3864EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3864EMSE#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 LTC3864EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3864EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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