My Inquiry
My Account
Analog Devices Inc. LTC3864IMSE#TRPBF
- Part No.:
- LTC3864IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3864IMSE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,180
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3864IMSE#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 - optimized for automotive and industrial power supplies requiring robust fault handling and wide VIN/VOUT range.
For engineers reviewing the LTC3864IMSE#TRPBF datasheet, LTC3864IMSE#TRPBF pinout, LTC3864IMSE#TRPBF application, or LTC3864IMSE#TRPBF equivalent, this page delivers verified technical context, validated pin functions, real-world application mappings, and two confirmed alternative controllers with documented functional trade-offs - all grounded in official Linear Technology documentation and parametric data.
Technical Context
The LTC3864IMSE#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 (1.8mS transconductance) drives the ITH pin to set peak inductor current, while VFB regulation tracks either 0.8V internal reference or external SS voltage during soft-start/tracking.
It integrates a dedicated gate driver LDO (VIN–VCAP = 8V typical), supports FMEA-verified adjacent-pin fault tolerance, and features dual light-load modes: user-selectable Burst Mode (40µA IQ) or pulse-skipping via PLLIN/MODE pin configuration - with frequency foldback active below 0.4V on VFB to limit inrush and short-circuit current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - enables direct battery-fed operation in 12V/24V/48V automotive and industrial systems without pre-regulation. |
| Output Voltage Range | 0.8V to VIN - supports ultra-low output rails and seamless transition into 100% duty cycle dropout mode. |
| Quiescent Current (Burst Mode) | 40µA - sustains >90% efficiency at 1mA load in always-on automotive modules. |
| Switching Frequency Range | 50kHz to 850kHz - adjustable via external resistor on FREQ pin; allows optimization of size vs. EMI vs. light-load efficiency. |
| Current Limit Threshold | 95mV ±10mV across RSENSE - provides accurate, temperature-stable overcurrent protection independent of VIN. |
| PGOOD Accuracy | ±10% window around 0.8V feedback reference - ensures reliable system power sequencing and fault reporting. |
| Operating Junction Temp | –40°C to +125°C - qualified for under-hood automotive and industrial ambient environments. |
Pinout & Package
Package: 12-lead thermally enhanced MSOP (4mm × 3mm) with exposed PGND pad (Pin 13) - requires soldering to PCB for thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 13) | Power Ground Reference | Exposed thermal pad; must be soldered to PCB ground plane for thermal dissipation and low-noise power return path. |
| GATE (Pin 12) | P-Channel MOSFET Gate Driver Output | Drives external high-side P-MOSFET; regulated gate bias (VIN–VCAP ≈ 8V) enables efficient high-side switching. |
| VIN (Pin 11) | Main Power Supply Input | Supplies internal circuitry and gate driver LDO; requires ≥0.1µF ceramic bypass to PGND. |
| SENSE (Pin 10) | Current Sense Differential Input | Kelvin-connected to RSENSE between VIN and SENSE; sets peak current limit at 95mV/RSENSE. |
| CAP (Pin 9) | Gate Driver Bias Capacitor Terminal | Connects to VIN via ≥0.47µF low-ESR ceramic; forms local charge reservoir for gate drive LDO stability. |
| RUN (Pin 8) | Enable/Shutdown Control | Logic-compatible input (1.26V threshold); internal 0.4µA pull-up allows direct connection to 60V supply. |
| PGOOD (Pin 7) | Open-Drain Power Good Output | Asserts low when VFB deviates >±10% from 0.8V or RUN is inactive; includes 100µs delay for glitch immunity. |
| ITH (Pin 6) | Error Amplifier Output / Compensation Node | 0–2.9V analog control voltage; sets peak current threshold and serves as loop compensation point. |
| VFB (Pin 5) | Feedback Voltage Input | Regulated to 0.8V nominal; resistor divider from VOUT sets output voltage; triggers foldback if <0.4V. |
| SS (Pin 4) | Soft-Start / Tracking Input | Internal 10µA pull-up charges external capacitor for controlled ramp; accepts external voltage for output tracking. |
| SGND (Pin 3) | Signal Ground Reference | Analog ground for VFB, ITH, FREQ, PLLIN/MODE; must connect to PGND at single-point star ground. |
| FREQ (Pin 2) | Frequency Set Point Input | 20µA current source sets oscillator frequency via external resistor; ground = 350kHz, open = 535kHz. |
| PLLIN/MODE (Pin 1) | External Clock Sync / Light-Load Mode Select | Floating = Burst Mode (40µA IQ); grounded = pulse-skipping; driven by 75–750kHz clock = phase-locked operation. |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Operation | Enables seamless dropout behavior when VIN drops below VOUT - critical for cold-crank automotive scenarios down to 3.5V. |
| FMEA-Verified Pin Fault Tolerance | Guaranteed safe operation during adjacent-pin shorts/opens - meets ASIL-B readiness requirements for automotive power stages. |
| Programmable Burst Mode IQ | 40µA quiescent current maintains >90% efficiency at microamp loads - extends battery life in always-on telematics modules. |
| Integrated Gate Driver LDO | VIN–VCAP regulated to 8V with <0.5V dropout - eliminates need for external bootstrap or charge-pump circuitry for P-MOSFET drive. |
| Frequency Foldback Protection | Reduces switching frequency to ~18% of setpoint when VFB <0.4V - limits inductor current during startup and short-circuit faults. |
| Accurate ±10% PGOOD Monitoring | Provides deterministic power-good assertion with 100µs delay - enables reliable system reset and sequencing in multi-rail designs. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 3.3V/2A core logic and 1.8V/1A memory rails from 12V vehicle battery with cold-crank support down to 3.5V. IC Role / Device Role / Timing Role: High-voltage step-down controller managing P-MOSFET switch, current sensing, and output regulation with 100% duty cycle capability. Use Value: Maintains regulated output during engine cranking transients without brownout; Burst Mode extends standby time for always-on CAN nodes. |
Use Scenario: Generating isolated 5V/3A auxiliary rail from 24V DC field bus in programmable logic controller backplane. IC Role / Device Role / Timing Role: Primary controller for non-isolated buck stage feeding downstream isolated DC/DC converters. Use Value: Wide 3.5–60V input accommodates 24V nominal with 30% line variation; FMEA validation reduces field failure risk in safety-critical automation. |
| Telecom Remote Radio Unit | Distributed Data Acquisition System |
Use Scenario: Converting 48V PoE++ or telecom rectified bus to 12V/5A for RF power amplifiers in outdoor small cells. IC Role / Device Role / Timing Role: High-efficiency, high-reliability buck controller with synchronized switching to minimize EMI in dense RF environments. Use Value: Phase-lockable 75–750kHz operation enables EMI reduction via clock synchronization with baseband processor; 125°C rating suits sealed enclosures. |
Use Scenario: Powering 5V/1A sensor interface and 3.3V/500mA microcontroller in remote environmental monitoring node powered by solar-charged 36V battery bank. IC Role / Device Role / Timing Role: Main DC/DC controller supporting wide-input, low-quiescent operation and soft-start into pre-biased outputs. Use Value: 40µA Burst Mode IQ minimizes night-time battery drain; SS pin tracking enables coordinated startup with backup LDO during solar recharge cycles. |
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, no Burst Mode - uses constant-frequency CCM only. | Required for dual-rail systems (e.g., ±12V analog supplies); lacks 40µA light-load efficiency of LTC3864IMSE#TRPBF. | Select when needing two independent regulated outputs or lowest possible shutdown current; avoid if Burst Mode efficiency is critical. |
| LM5116MH/NOPB | 60V input, 100% duty cycle, but 1.5mA light-load IQ and no integrated gate driver LDO - requires external bias supply. | Suitable for cost-sensitive industrial supplies where 40µA IQ is unnecessary; less compact due to external gate bias components. | Select for TI ecosystem compatibility or lower BOM cost; avoid when minimizing board area or achieving sub-100µA light-load operation. |
Compared with LTC3892EMSE#TRPBF and LM5116MH/NOPB, the LTC3864IMSE#TRPBF uniquely combines 40µA Burst Mode IQ, integrated 8V gate driver LDO, and FMEA-verified fault tolerance - making it optimal for space-constrained, always-on automotive and industrial controllers where light-load efficiency and reliability are co-prioritized.
Availability
LTC3864IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power modules, and telecom remote radio units requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for LTC3864IMSE#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors - serving automotive, industrial, communications, and aerospace markets with precision, reliability, and innovation.
The LTC3864IMSE#TRPBF belongs to Linear's high-voltage DC/DC controller product line, designed specifically for robust, wide-input-range power conversion in harsh environments - emphasizing fault resilience, low IQ, and seamless dropout operation.
FAQ
What is the maximum input voltage rating for the LTC3864IMSE#TRPBF?
The LTC3864IMSE#TRPBF has an absolute maximum input supply voltage (VIN) of 65V, with continuous operating range specified from 3.5V to 60V. This makes the LTC3864IMSE#TRPBF suitable for 48V industrial buses and automotive systems experiencing load-dump transients up to 60V, provided external clamping or filtering is applied per design guidelines.
Does the LTC3864IMSE#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3864IMSE#TRPBF supports true 100% duty cycle operation - achieved by disabling the gate driver when VIN drops below the regulated output voltage, allowing the P-channel MOSFET to remain fully enhanced. This behavior is intrinsic to its architecture and requires no external circuitry, enabling uninterrupted power delivery during automotive cold-crank events down to 3.5V.
How does the Burst Mode operation of the LTC3864IMSE#TRPBF achieve 40µA quiescent current?
The LTC3864IMSE#TRPBF achieves 40µA quiescent current in Burst Mode by disconnecting the error amplifier output from the ITH pin and holding ITH at 0.55V while disabling most internal circuitry - including oscillator, gate driver, and current comparator - until output voltage droop re-engages regulation. This deep sleep state is activated automatically when the PLLIN/MODE pin is left floating, and is confirmed in the Electrical Characteristics table under "Burst Mode Operation".
Can the LTC3864IMSE#TRPBF be synchronized to an external clock, and what is the valid frequency range?
Yes, the LTC3864IMSE#TRPBF can be synchronized to an external clock applied to the PLLIN/MODE pin, with guaranteed lock range from 75kHz to 750kHz. The device uses an internal phase-locked loop to align the GATE turn-on edge with the rising edge of the external clock, and requires input logic levels of >2V for high and <0.5V for low - as specified in the Electrical Characteristics table under "Synchronization Frequency".
What package type and thermal specifications apply to the LTC3864IMSE#TRPBF?
The LTC3864IMSE#TRPBF is packaged in a 12-lead thermally enhanced MSOP (4mm × 3mm) with exposed PGND pad (Pin 13). Its thermal resistance is θJA = 40°C/W and θJC = 10°C/W, requiring soldering of the exposed pad to the PCB for optimal thermal performance. This package supports continuous operation up to +125°C junction temperature, validated per the –40°C to +125°C operating range in the Order Information table.
LTC3864IMSE#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
LTC3864IMSE#TRPBF FAQ
1.How can I place an order for LTC3864IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3864IMSE#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 LTC3864IMSE#TRPBF reliable?
The price and inventory of LTC3864IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3864IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3864IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3864IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3864IMSE#TRPBF?
LTC3864IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3864IMSE#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 LTC3864IMSE#TRPBF?
For technical support, including LTC3864IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3864IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3864IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3864IMSE#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 LTC3864IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3864IMSE#TRPBF?
All LTC3864IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3864IMSE#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 LTC3864IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3864IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3864IMSE#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
