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Analog Devices Inc. LTC3864HMSE#TRPBF
- Part No.:
- LTC3864HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3864HMSE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,920
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Product details
Overview
LTC3864HMSE#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 power supplies requiring robust fault handling and wide VIN/VOUT range.
For engineers reviewing the LTC3864HMSE#TRPBF datasheet, LTC3864HMSE#TRPBF pinout, LTC3864HMSE#TRPBF application, or LTC3864HMSE#TRPBF equivalent, key selection criteria include its verified FMEA-compliant adjacent-pin fault tolerance, 100% duty cycle capability under low-VIN dropout, ±10% PGOOD accuracy with 100µs delay, and thermal-grade H-temp (–40°C to 150°C) MSOP package with exposed PGND pad.
Technical Context
The LTC3864HMSE#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 targets 0.800V ±0.009V with ±0.005%/V line regulation.
It integrates a dedicated gate bias LDO (VIN–VCAP = 8.0V ±0.4V) with 0.2V dropout at 15mA, supports PLL synchronization (75kHz–750kHz), and features dual light-load modes: Burst Mode (40µA IQ) enabled by floating PLLIN/MODE, or pulse-skipping mode selected by grounding PLLIN/MODE - both preserving output regulation during transient recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports cold-crank (4.5V) and load-dump (60V) conditions in automotive systems. |
| Output Voltage Range | 0.8V to VIN - enables true 100% duty cycle operation for ultra-low dropout (e.g., 5V out from 5.2V in). |
| Quiescent Current | 40µA in Burst Mode - sustains >90% efficiency at 1mA load, critical for always-on vehicle modules. |
| Switching Frequency | 50kHz to 850kHz (resistor-programmable) - balances EMI, size, and efficiency; 350kHz default when FREQ grounded. |
| Current Limit Threshold | 95mV ±8mV (VIN–SENSE) - sets accurate peak inductor current limit independent of temperature drift. |
| PGOOD Accuracy | ±10% window around 0.8V reference - ensures reliable system power sequencing with 100µs delay. |
| Operating Junction Temp | –40°C to +150°C - qualified for under-hood automotive applications per H-grade specification. |
Pinout & Package
The LTC3864HMSE#TRPBF is housed in a thermally enhanced 12-lead plastic MSOP package with exposed PGND pad (Pin 13), requiring soldering to PCB for optimal thermal performance (θJA = 40°C/W, θJC = 10°C/W). The exposed pad is electrically connected to PGND and must be used as the primary power ground return path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE (12) | P-channel MOSFET gate driver output | Drives external high-side P-MOSFET; regulated gate bias (VIN–VCAP = 8V) enables efficient 100% duty cycle. |
| VIN (11) | Main supply input | Accepts 3.5V–60V; powers internal circuitry and gate driver LDO; requires ≥0.1µF ceramic bypass to PGND. |
| SENSE (10) | Current sense differential input | Kelvin-connected to RSENSE; 95mV threshold sets peak current limit; <2µA input bias minimizes error. |
| CAP (9) | Gate driver bias supply | Requires ≥0.47µF low-ESR ceramic between VIN and CAP; stabilizes VCAP LDO for noise-immune gate drive. |
| RUN (8) | Enable/disable control | 1.26V threshold with 150mV hysteresis; 0.4µA internal pull-up allows direct connection to 60V supply. |
| PGOOD (7) | Open-drain power-good indicator | Pulled low if VFB outside ±10% of 0.8V or RUN = low; 100µs delay prevents false triggering during transients. |
| ITH (6) | Error amplifier output & compensation node | 0–2.9V range; connects to RC network for loop stability; 1.8mS transconductance enables tight regulation. |
| VFB (5) | Feedback voltage input | Regulated to 0.800V ±0.009V; resistor divider from VOUT sets output; <50nA bias current preserves accuracy. |
| SS (4) | Soft-start/tracking control | Internal 10µA pull-up charges external capacitor; regulates VFB to SS voltage during startup for controlled ramp. |
| SGND (3) | Signal ground reference | Separate analog ground for VFB, ITH, SS, FREQ; must connect to PGND at single point to avoid noise coupling. |
| FREQ (2) | Frequency programming input | 20µA current source sets oscillator via RFREQ; 0V = 350kHz, open = 535kHz, resistor = 50–850kHz. |
| PLLIN/MODE (1) | Sync clock input / Burst Mode enable | Floating = 40µA Burst Mode; grounded = pulse-skipping; external 75–750kHz clock synchronizes GATE edge. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enables seamless transition into dropout (e.g., VIN drops below VOUT); maintains regulation without output collapse. |
| FMEA-verified adjacent-pin fault tolerance | Guaranteed safe operation during open/short faults between any two pins - required for ASIL-B automotive designs. |
| Programmable Burst Mode (40µA IQ) | Reduces no-load power consumption by >95% vs. PWM mode; maintains ±1% output accuracy during burst cycles. |
| Frequency foldback under overload | Reduces switching frequency to ~18% of setpoint when VFB < 0.4V - limits inductor current during short-circuit start-up. |
| Thermally enhanced H-grade MSOP | Rated for –40°C to +150°C junction temperature; exposed PGND pad lowers thermal resistance to 10°C/W (θJC). |
| Accurate 0.8V feedback reference | 0.800V ±0.009V over full temp range; ±0.005%/V line regulation ensures stable output across 3.5–60V input. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module Supply |
|---|---|
Use Scenario: Powering 5V/2A FPGA core and interface logic in head-unit ECUs exposed to 4.5–16V battery with load-dump spikes up to 60V. IC Role / Device Role / Timing Role: High-voltage step-down controller managing P-MOSFET switch, providing regulated 5V with 100% duty cycle during cold-crank (5.2V battery). Use Value: Eliminates need for pre-regulator; 40µA Burst Mode extends battery life in sleep mode; FMEA compliance meets ISO 26262 functional safety requirements. |
Use Scenario: Generating isolated 3.3V/1A supply for digital I/O channels in factory automation controllers operating from 24V DC bus. IC Role / Device Role / Timing Role: Primary DC/DC controller driving external P-MOSFET; synchronized to system clock (100kHz) via PLLIN/MODE to reduce EMI. Use Value: Programmable frequency avoids noise-sensitive bands; ±10% PGOOD enables reliable watchdog reset; H-grade temp rating supports cabinet ambient up to 85°C. |
| Telecom Remote Radio Unit (RRU) | Distributed Power Architecture (DPA) |
Use Scenario: Converting –48V telecom supply to 12V intermediate bus in outdoor base station equipment with wide ambient temperature swing. IC Role / Device Role / Timing Role: Robust step-down controller supporting negative-input configurations (via level-shifting); operates from 3.5–60V equivalent input range. Use Value: 150°C max junction temperature enables operation without forced air cooling; frequency foldback protects during antenna fault-induced short circuits. |
Use Scenario: Local point-of-load conversion from 12V intermediate bus to 1.8V/10A for ASICs in data center servers with strict efficiency targets. IC Role / Device Role / Timing Role: Controller for high-efficiency buck stage using discrete P-MOSFET and Schottky diode; soft-start prevents inrush into pre-biased loads. Use Value: SS pin tracking enables coordinated startup with upstream converters; 0.8V reference tolerance ensures <±1% output accuracy across load/line/temp. |
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; includes second channel and integrated bootstrap diode. | Required for dual-rail systems (e.g., ±5V); higher BOM cost and layout complexity for single-output use. | Select only when dual-output or lower shutdown IQ is mandatory; not drop-in compatible due to pinout and feature set differences. |
| MP24894GQKT-Z | Monolithic 60V buck converter (integrated MOSFETs); 45µA IQ; fixed 300kHz frequency; no 100% duty cycle or FMEA verification. | Suitable for space-constrained designs where external FETs are undesirable; lacks automotive qualification and fault tolerance. | Prefer for cost-sensitive, non-safety-critical applications; requires redesign for 100% duty cycle or FMEA-compliant operation. |
Compared with LTC3864HMSE#TRPBF, LTC3892EMSE#TRPBF adds channel count and integration at the expense of single-channel optimization, while MP24894GQKT-Z trades design flexibility and fault resilience for monolithic simplicity - making LTC3864HMSE#TRPBF the optimal choice for high-reliability, single-output automotive and industrial controllers demanding 100% duty cycle and FMEA validation.
Availability
LTC3864HMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC power supplies, and telecom remote radio units requiring stable component supply across extended temperature and voltage stress conditions.
Supply support for LTC3864HMSE#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 ICs, serving automotive, industrial, and communications markets with precision, reliability, and long-term product support.
The LTC3864HMSE#TRPBF belongs to Linear's high-voltage DC/DC controller product line, designed specifically for ruggedized power conversion in automotive and industrial environments where wide input range, fault tolerance, and thermal resilience are mandatory.
FAQ
What is the maximum junction temperature rating for the LTC3864HMSE#TRPBF?
The LTC3864HMSE#TRPBF is rated for a maximum junction temperature of +150°C and is specified over the operating junction temperature range of –40°C to +150°C. This H-grade qualification makes it suitable for under-hood automotive applications and high-ambient industrial environments where thermal derating above 125°C is required. The MSOP package features an exposed PGND pad that must be soldered to the PCB to achieve the specified θJC of 10°C/W.
Does the LTC3864HMSE#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3864HMSE#TRPBF supports true 100% duty cycle operation to maintain regulation when input voltage drops below the programmed output voltage - critical for automotive cold-crank scenarios. It achieves this by disabling the gate driver only when the VIN–VCAP differential falls below ~3.25V (typical), allowing continuous conduction through the external P-channel MOSFET. No external components are needed; the behavior is inherent to the controller's architecture and gate bias LDO design.
How does the Burst Mode operation of the LTC3864HMSE#TRPBF reduce light-load power consumption?
The LTC3864HMSE#TRPBF achieves 40µA quiescent current in Burst Mode by disconnecting the error amplifier output from the ITH pin and holding ITH at 0.55V when VFB exceeds the 0.8V reference. This disables switching and places most internal circuitry in sleep state while the output capacitor supplies load current. When VFB drops sufficiently, the controller wakes and delivers a burst of pulses until regulation is restored - maintaining high efficiency (>85%) even at 1mA load without audible noise or excessive ripple.
What fault protection features are built into the LTC3864HMSE#TRPBF?
The LTC3864HMSE#TRPBF includes overvoltage protection (VFB > +10% trips immediate GATE shutdown), overcurrent/short-circuit protection with frequency foldback (activates when VFB < 0.4V), undervoltage lockout (UVLO at 3.25V VIN–VCAP), and a 100µs-delayed PGOOD output. Crucially, it has undergone formal FMEA analysis verifying safe operation during adjacent-pin opens or shorts - a requirement for ASIL-B automotive systems and high-reliability industrial control.
Can the LTC3864HMSE#TRPBF be synchronized to an external clock, and what is the valid frequency range?
Yes, the LTC3864HMSE#TRPBF can be synchronized to an external clock applied to the PLLIN/MODE pin. The integrated phase-locked loop supports synchronization from 75kHz to 750kHz, with input logic thresholds of 2V (high) and 0.5V (low). Synchronization aligns the rising edge of the external P-MOSFET gate drive with the external clock's rising edge, reducing EMI in multi-converter systems. The internal oscillator's default frequency (set by FREQ pin) must be within ~20% of the sync frequency for rapid lock.
LTC3864HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3864HMSE#TRPBF FAQ
1.How can I place an order for LTC3864HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3864HMSE#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 LTC3864HMSE#TRPBF reliable?
The price and inventory of LTC3864HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3864HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3864HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3864HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3864HMSE#TRPBF?
LTC3864HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3864HMSE#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 LTC3864HMSE#TRPBF?
For technical support, including LTC3864HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3864HMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3864HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3864HMSE#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 LTC3864HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3864HMSE#TRPBF?
All LTC3864HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3864HMSE#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 LTC3864HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3864HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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