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Analog Devices Inc. LTC3864MPMSE#TRPBF
- Part No.:
- LTC3864MPMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3864MPMSE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,977
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Product details
Overview
LTC3864MPMSE#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 designed for automotive power supplies requiring extended temperature operation and FMEA-verified fault resilience.
For engineers reviewing the LTC3864MPMSE#TRPBF datasheet, LTC3864MPMSE#TRPBF pinout, LTC3864MPMSE#TRPBF application, or LTC3864MPMSE#TRPBF equivalent, this page delivers verified technical context, package-specific pin functions, real-world application constraints, and validated alternative options - all grounded in the official LTC3864 datasheet (Rev. FA) and Analog Devices product documentation.
Technical Context
The LTC3864MPMSE#TRPBF implements a constant-frequency, peak current-mode control architecture with slope compensation, enabling precise current limiting and stable loop response across wide VIN/VOUT ranges. Its error amplifier (1.8mS transconductance) drives the ITH node to set peak inductor current via a 95mV sense threshold, while internal VFB regulation targets 0.800V ±0.009V with ±0.005%/V line regulation.
It integrates a dedicated gate driver LDO (VIN–VCAP = 8.0V ±0.4V) capable of sourcing/sinking >20mA into P-MOSFET gates, with UVLO triggered at 3.25V (typ) VIN–VCAP and recovery at 3.5V (typ). The device supports phase-lockable synchronization (75kHz–750kHz) and includes frequency foldback (18% of setpoint) during overcurrent events to limit stress under short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports direct connection to 12V/24V/48V automotive and industrial rails without pre-regulation. |
| Output Voltage Range | 0.8V to VIN - enables true dropout operation down to 100% duty cycle when VIN ≤ VOUT. |
| Quiescent Current | 40µA in Burst Mode - sustains ultra-low standby power for always-on automotive modules. |
| Switching Frequency | 50kHz to 850kHz (resistor-programmable) - allows optimization of size (high f) vs. efficiency (low f) in space-constrained designs. |
| Current Sense Threshold | 95mV (typ) - sets accurate peak current limit independent of temperature (±1.5mV drift over –55°C to 150°C). |
| Operating Junction Temp | –55°C to +150°C - qualified for under-hood automotive applications per AEC-Q100 stress test profiles. |
| Gate Driver Strength | RUP = 2Ω / RDN = 0.9Ω - ensures fast P-MOSFET turn-on/turn-off, minimizing switching losses at high frequencies. |
Pinout & Package
Package: 12-lead plastic MSOP with exposed PGND pad (pin 13), thermally enhanced for –55°C to +150°C operation. Exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 13) | Power Ground Reference | Exposed thermal pad tied to system power ground; mandatory for θJA = 40°C/W and safe current return path. |
| GATE (Pin 12) | P-Channel MOSFET Gate Driver Output | Drives external high-side P-MOSFET; rail-to-rail swing referenced to VIN, with 2Ω pull-up/0.9Ω pull-down. |
| VIN (Pin 11) | Main Power Supply Input | Supplies internal circuitry and gate driver LDO; requires ≥0.1µF low-ESR ceramic bypass to PGND. |
| SENSE (Pin 10) | Current Sense Differential Input | Kelvin-connected to RSENSE; detects VIN–SENSE voltage to enforce 95mV peak current limit. |
| CAP (Pin 9) | Gate Driver Bias Supply | Regulated LDO output (VIN–VCAP = 8V); requires ≥0.47µF ceramic cap to VIN for stability and noise immunity. |
| 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 Flag | Asserts low when VFB deviates >±10% from 0.8V; includes 100µs delay to reject transient excursions. |
| ITH (Pin 6) | Error Amplifier Output & Compensation Node | 0–2.9V analog control voltage; connects to RC network for loop stability and current limit setting. |
| VFB (Pin 5) | Feedback Voltage Input | Compares against 0.800V reference; resistor divider from VOUT sets regulated output voltage. |
| SS (Pin 4) | Soft-Start / Tracking Input | Internal 10µA pull-up charges external capacitor for controlled ramp; also accepts external tracking voltage. |
| FREQ (Pin 2) | Frequency Set Point | 20µA current source develops voltage across RFREQ to program 50–850kHz; ground = 350kHz, open = 535kHz. |
| PLLIN/MODE (Pin 1) | Sync Clock Input / Light-Load Mode Select | Floating = Burst Mode (40µA IQ); grounded = Pulse-Skipping; driven = PLL sync (75–750kHz). |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-Verified Pin Fault Tolerance | Guaranteed operation during adjacent pin open/short faults - critical for ASIL-B/C automotive safety compliance. |
| 100% Duty Cycle Dropout | Enables seamless transition from regulation to full pass-through when VIN drops below VOUT - eliminates brownout on cold-crank. |
| Programmable Burst Mode | Reduces light-load IQ to 40µA while maintaining tight output regulation - extends battery life in always-on telematics. |
| Robust Gate Driver LDO | Maintains 8V gate bias (VIN–VCAP) with <0.5V dropout and ±3.5% load regulation - ensures strong P-MOSFET drive across temperature. |
| Frequency Foldback Protection | Automatically reduces switching frequency to ~18% of setpoint during overcurrent - limits peak inductor current and thermal stress. |
| Extended Temperature Grade | –55°C to +150°C operating range with full parameter guarantee - qualified for engine compartment and industrial harsh environments. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial 24V Rail Converter |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interfaces in under-hood ECU modules subject to cold-crank (4.5V) and load-dump (60V) transients. IC Role / Device Role / Timing Role: High-voltage step-down controller regulating 5V/3.3V rails from battery; provides 100% duty cycle during cranking and foldback during short-circuit. Use Value: Maintains system uptime during 4.5V cold-crank without reset; withstands 60V load-dump without external TVS; FMEA verification simplifies ISO 26262 FMEDA. |
Use Scenario: Converting 24V industrial bus to isolated 5V logic supply for PLC I/O modules operating in ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Primary controller for non-isolated buck stage; delivers 2A continuous output with programmable soft-start to prevent inrush into downstream DC-DCs. Use Value: 40µA Burst Mode extends standby time in energy-conscious automation systems; 125°C-rated variants available for convection-cooled enclosures. |
| Telecom Remote Radio Head (RRH) | Distributed Power Architecture (DPA) |
Use Scenario: Generating 12V intermediate bus from –48V telecom supply in outdoor base station RRH units exposed to –40°C to +70°C ambient. IC Role / Device Role / Timing Role: High-efficiency buck controller driving discrete P-MOSFET; synchronized to system clock via PLLIN/MODE to reduce EMI. Use Value: Phase-lockable frequency (75–750kHz) enables deterministic spectral shaping; 60V absolute max rating avoids need for input clamping. |
Use Scenario: Local point-of-load (POL) conversion in server backplanes where multiple 12V–5V/3.3V rails are distributed across large PCBs. IC Role / Device Role / Timing Role: Compact, thermally efficient buck controller supporting output tracking for sequenced power-up of FPGAs and ASICs. Use Value: SS pin enables precise voltage ramp alignment between core and I/O rails; MSOP package fits dense POL layouts with minimal thermal footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3892EMSE#TRPBF | Dual-output, 60V controller with integrated bootstrap diode; higher IQ (65µA), no 100% duty cycle. | Suited for dual-rail systems (e.g., 5V + 3.3V) but lacks dropout capability for cold-crank survival. | Select when dual outputs are required and 100% duty cycle is not critical; verify layout compatibility with larger 16-pin MSOP. |
| LM5116MHX/NOPB | 65V controller with N-MOSFET drive; requires external bootstrap circuit; 100µA IQ in skip mode; no FMEA validation. | Better suited for cost-sensitive industrial converters where automotive qualification is unnecessary. | Choose for lower BOM cost in non-automotive applications; accept higher light-load IQ and added bootstrap complexity. |
Compared with LTC3864MPMSE#TRPBF, LTC3892EMSE#TRPBF adds dual-channel flexibility but sacrifices 100% duty cycle and FMEA assurance, while LM5116MHX/NOPB offers broader voltage margin and lower unit cost but lacks automotive-grade reliability testing and ultra-low IQ.
Availability
LTC3864MPMSE#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial 24V power supplies, and telecom remote radio heads requiring stable component supply across extended temperature and high-reliability environments.
Supply support for LTC3864MPMSE#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, serving automotive, industrial, communications, and aerospace markets.
The LTC3864 belongs to Linear's high-voltage DC/DC controller product line, engineered specifically for robustness in automotive and industrial power conversion - emphasizing FMEA validation, extended temperature operation, and 100% duty cycle capability.
FAQ
What is the guaranteed operating temperature range for LTC3864MPMSE#TRPBF?
The LTC3864MPMSE#TRPBF is fully specified and tested over –55°C to +150°C junction temperature. This MP grade exceeds standard automotive AEC-Q100 Grade 1 (–40°C to +125°C) and supports under-hood deployment without derating. All electrical parameters - including VFB accuracy, current limit, and gate drive strength - are guaranteed across this full range per the official datasheet Rev. FA.
Does LTC3864MPMSE#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, LTC3864MPMSE#TRPBF supports true 100% duty cycle operation. When VIN drops below the programmed VOUT, the controller disables switching and holds the P-MOSFET fully on, passing input directly to output. This behavior is inherent to its P-channel high-side architecture and requires no external circuitry. It ensures uninterrupted power during automotive cold-crank events (e.g., 4.5V battery).
How does the Burst Mode operation of LTC3864MPMSE#TRPBF achieve 40µA quiescent current?
LTC3864MPMSE#TRPBF achieves 40µA IQ in Burst Mode by disabling most internal circuitry - including oscillator, gate driver, and error amplifier - when load current falls below threshold. The ITH pin is held at 0.55V while the output capacitor supplies load current. When VOUT sags enough to raise ITH above 0.425V, the controller wakes and delivers a burst of pulses to recharge the output.
Can LTC3864MPMSE#TRPBF synchronize to an external clock, and what are the valid frequency and voltage levels?
Yes, LTC3864MPMSE#TRPBF supports PLL-based synchronization via the PLLIN/MODE pin. Valid sync frequency range is 75kHz to 750kHz. Input logic levels require VIH ≥ 2V and VIL ≤ 0.5V. The internal oscillator locks to the rising edge of the external clock, enabling deterministic EMI reduction in multi-rail systems.
What protection features are integrated into LTC3864MPMSE#TRPBF, and how do they respond to faults?
LTC3864MPMSE#TRPBF integrates overvoltage protection (OVP), overcurrent protection (OCP), short-circuit protection with frequency foldback, undervoltage lockout (UVLO), and PGOOD monitoring. During OVP (>±10% VFB), GATE shuts off immediately. During OCP, frequency folds to ~18% of setpoint to limit peak current. UVLO activates if VIN–VCAP < 3.25V (typ), halting switching until recovery.
LTC3864MPMSE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3864MPMSE#TRPBF FAQ
1.How can I place an order for LTC3864MPMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3864MPMSE#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 LTC3864MPMSE#TRPBF reliable?
The price and inventory of LTC3864MPMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3864MPMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3864MPMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3864MPMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3864MPMSE#TRPBF?
LTC3864MPMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3864MPMSE#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 LTC3864MPMSE#TRPBF?
For technical support, including LTC3864MPMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3864MPMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3864MPMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3864MPMSE#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 LTC3864MPMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3864MPMSE#TRPBF?
All LTC3864MPMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3864MPMSE#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 LTC3864MPMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3864MPMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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