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Analog Devices Inc. LTC3864MPMSE#PBF
- Part No.:
- LTC3864MPMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3864MPMSE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,173
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Product details
Overview
LTC3864MPMSE#PBF 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 cold-crank and industrial wide-input power supplies.
For engineers reviewing the LTC3864MPMSE#PBF datasheet, LTC3864MPMSE#PBF pinout, LTC3864MPMSE#PBF application, or LTC3864MPMSE#PBF equivalent, this page delivers verified functional identity, thermal-grade packaging details (–55°C to 150°C), gate driver strength (RUP = 2Ω, RDN = 0.9Ω), FMEA-verified adjacent-pin fault tolerance, and precise current limit threshold (95mV typ).
Technical Context
The LTC3864MPMSE#PBF implements a constant-frequency peak current-mode control architecture with slope compensation, enabling stable regulation across wide VIN/VOUT ranges and fast transient response. 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 from 50kHz to 850kHz.
It integrates a dedicated 8V LDO (VIN–VCAP) for robust P-MOSFET gate drive, with verified FMEA compliance for adjacent pin open/short faults and built-in frequency foldback (18% of setpoint) during overcurrent or short-circuit events - ensuring safe startup and fault recovery without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports automotive cold-crank (4.5V) and industrial 48V bus applications without pre-regulation. |
| Output Voltage Range | 0.8V to VIN - enables true 100% duty cycle dropout operation for low-VIN scenarios like battery backup systems. |
| Quiescent Current (Burst Mode) | 40µA typical - sustains >90% efficiency at 1mA load in automotive always-on modules. |
| Switching Frequency Range | 50kHz to 850kHz - adjustable via external resistor on FREQ pin; enables EMI optimization and inductor size reduction. |
| Current Limit Threshold | 95mV typical (VIN–SENSE) - sets accurate peak inductor current limit independent of temperature (±1.5% over –55°C to 150°C). |
| Gate Driver Strength | RUP = 2Ω / RDN = 0.9Ω - ensures fast turn-on/turn-off of high-side P-MOSFETs up to 100ns propagation delay. |
| Operating Junction Temp | –55°C to 150°C - fully tested and guaranteed for extended-temperature automotive and downhole industrial use. |
Pinout & Package
Package: 12-lead plastic MSOP with exposed PGND pad (Pin 13), thermally enhanced for θJA = 40°C/W. Exposed pad must be soldered to PCB for rated thermal performance and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PLLIN/MODE | External clock input / Burst Mode enable | Floating enables 40µA Burst Mode; grounded selects pulse-skipping; external clock (75–750kHz) synchronizes GATE edge. |
| 2 - FREQ | Frequency programming input | 20µA current source sets oscillator frequency; ground = 350kHz, open = 535kHz, resistor = 50–850kHz. |
| 3 - SGND | Signal ground reference | Isolated analog ground for VFB, ITH, SS; connect to PGND at single point only to avoid noise coupling. |
| 4 - SS | Soft-start and tracking input | Internal 10µA pull-up charges external capacitor for controlled VOUT ramp; accepts external voltage for supply tracking. |
| 5 - VFB | Feedback voltage sense | Regulates to 0.800V ±1%; ±10% window triggers PGOOD; <0.4V activates frequency foldback. |
| 6 - ITH | Error amplifier output / current threshold | 0–2.9V range sets peak inductor current; connects to compensation network (RITH, CITH1). |
| 7 - PGOOD | Open-drain power-good indicator | Pulls low when VFB outside ±10% of 0.8V or RUN = low; 100µs delay prevents false triggering. |
| 8 - RUN | Enable/disable control | 1.26V threshold; internal 0.4µA pull-up allows direct connection to 60V supply for high-side enable. |
| 9 - CAP | GATE driver bias supply | VIN–VCAP regulated to 8V; requires ≥0.47µF ceramic cap between VIN and CAP for stable gate drive. |
| 10 - SENSE | Current sense input | Kelvin-connected to RSENSE; differential voltage (VIN–SENSE) compared to 95mV threshold for OCP. |
| 11 - VIN | Main power supply input | 3.5–60V input; minimum 0.1µF ceramic bypass required; powers internal circuitry and CAP LDO. |
| 12 - GATE | P-MOSFET gate driver output | Drives high-side switch; disabled if VIN–VCAP < 3.25V (typical); strong drive (0.9Ω pull-down) minimizes switching loss. |
| 13 - PGND | Power ground (exposed pad) | Must be soldered to PCB plane; serves as return path for GATE, SENSE, and CAP currents; separates from SGND. |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-verified adjacent-pin fault tolerance | Guaranteed operation under open/short faults between any two pins - critical for ASIL-B/C automotive safety compliance. |
| 100% duty cycle capability | Enables seamless transition from regulation to dropout when VIN drops below VOUT - eliminates output collapse in brownout conditions. |
| Programmable Burst Mode (40µA IQ) | Reduces no-load power consumption by >95% vs. pulse-skipping mode - extends battery life in always-on telematics modules. |
| Integrated 8V gate bias LDO (VIN–VCAP) | Delivers stable gate drive voltage independent of VIN fluctuations - ensures consistent P-MOSFET RDS(on) and low conduction loss. |
| Frequency foldback during overcurrent | Scales foldback % linearly with programmed fSW (18% min) - maintains safe peak current across all operating frequencies. |
| Accurate 0.800V feedback reference (±1%) | Ensures ±1% output voltage accuracy over temperature and line - eliminates need for post-regulation trimming in precision supplies. |
Applications
| Automotive Infotainment Power | Industrial 24V/48V DC-DC Conversion |
|---|---|
Use Scenario: Powering DSP, FPGA, and display logic in head units during cold-crank (4.5V battery) and load-dump (60V transients). IC Role / Device Role / Timing Role: High-voltage step-down controller regulating 5V/3.3V rails from unregulated vehicle battery. Use Value: 100% duty cycle maintains output during cranking; 60V abs max rating withstands ISO 7637-2 pulses; –55°C to 150°C grade supports under-hood placement. |
Use Scenario: Converting 48V telecom or factory automation bus to isolated 12V/5V intermediate rails. IC Role / Device Role / Timing Role: Primary controller for non-isolated buck stage feeding downstream isolated DC-DC modules. Use Value: Wide 3.5–60V input accommodates 48V nominal ±20% variation; programmable fSW avoids sensitive EMI bands; FMEA validation reduces system-level safety analysis effort. |
| Downhole Oil & Gas Sensor Supply | Aerospace Remote I/O Power |
Use Scenario: Providing stable 3.3V for pressure/temperature sensors in borehole tools exposed to –55°C ambient and 150°C junction temperatures. IC Role / Device Role / Timing Role: Primary DC-DC controller in hermetically sealed, high-reliability power module. Use Value: Fully tested –55°C to 150°C operation eliminates derating; 40µA Burst Mode extends battery life in wireless sensor nodes; PGND-exposed pad enables robust thermal management in confined spaces. |
Use Scenario: Generating 5V/2A for remote terminal units (RTUs) in satellite payload interfaces requiring radiation-tolerant design practices. IC Role / Device Role / Timing Role: Non-radiation-hardened but FMEA-validated controller used in fault-mitigated power architecture. Use Value: Adjacent-pin fault tolerance replaces need for external redundancy; PGOOD with 100µs delay enables deterministic fault logging; low shutdown IQ (7µA) preserves backup power during safe mode. |
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#PBF | Dual-output, 60V input, 3.5µA IQ (Burst), integrated bootstrap diode - no external P-MOSFET needed for second channel. | Requires dual-rail output; higher BOM cost but saves board space in multi-output systems. | Select when needing two independent regulated outputs from single controller; not drop-in due to different pinout and dual-channel architecture. |
| LM5116MHX/NOPB | 60V input, N-MOSFET controller, 100µA IQ, no 100% duty cycle, no FMEA validation, SOIC-20 package. | Requires external high-side driver and bootstrap circuit; unsuitable for cold-crank dropout or ASIL-B systems. | Select for cost-sensitive industrial applications where extended temp range and fault tolerance are not required. |
Compared with LTC3892EMSE#PBF and LM5116MHX/NOPB, the LTC3864MPMSE#PBF uniquely delivers guaranteed –55°C to 150°C operation, FMEA-verified fault resilience, and true 100% duty cycle - making it the only choice for mission-critical automotive and downhole applications where dropout behavior and junction temperature extremes are non-negotiable.
Availability
LTC3864MPMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial 48V DC-DC conversion, and downhole oil & gas sensor power supplies requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3864MPMSE#PBF 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) designs high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and aerospace applications.
The LTC3864 product line delivers robust, high-voltage DC/DC controllers with FMEA validation, extended temperature grading, and ultra-low IQ - specifically engineered for automotive cold-crank, industrial wide-input, and harsh-environment power systems.
FAQ
What is the guaranteed operating temperature range for the LTC3864MPMSE#PBF?
The LTC3864MPMSE#PBF is fully tested and guaranteed over –55°C to 150°C junction temperature. This extended range is validated per manufacturer specifications and distinguishes it from commercial-grade variants (e.g., LTC3864EMSE#PBF, –40°C to 125°C). The LTC3864MPMSE#PBF's qualification includes thermal cycling, high-temperature operating life, and parametric testing across the full range - essential for under-hood automotive and downhole tool applications.
Does the LTC3864MPMSE#PBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3864MPMSE#PBF 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 continuously on - eliminating output collapse during brownout. This behavior is inherent to its architecture and requires no external circuitry or mode switching; it is verified in the datasheet's dropout behavior plots (Figure G06) and explicitly stated in the device description.
How does the Burst Mode operation of the LTC3864MPMSE#PBF achieve 40µA quiescent current?
The LTC3864MPMSE#PBF achieves 40µA quiescent current in Burst Mode by disabling most internal circuitry - including the oscillator, gate driver, and current comparator - while maintaining only the error amplifier and sleep-state logic active. When VFB exceeds 0.8V, the ITH voltage drops below 0.425V, triggering sleep mode; the output capacitor supplies load current until VFB falls sufficiently to wake the controller. This cycle repeats, minimizing average supply current - confirmed in Figure G13 (Burst Mode IVIN vs VIN).
What is the purpose of the exposed PGND pad (Pin 13) on the LTC3864MPMSE#PBF MSOP package?
The exposed PGND pad (Pin 13) on the LTC3864MPMSE#PBF serves two critical functions: (1) as the primary return path for high-current GATE, SENSE, and CAP circuits to minimize ground bounce and EMI; and (2) as the thermal interface for heat dissipation - reducing θJA to 40°C/W. Per the datasheet, it must be soldered to a PCB copper plane; failure to do so degrades both thermal performance and electrical stability, especially under high-duty-cycle or high-temperature operation.
Can the LTC3864MPMSE#PBF be synchronized to an external clock, and what are the valid frequency and voltage levels?
Yes, the LTC3864MPMSE#PBF can be synchronized via the PLLIN/MODE pin (Pin 1) across 75kHz to 750kHz. The external clock must meet TTL-compatible thresholds: VIH ≥ 2V and VIL ≤ 0.5V, with clean rise/fall times. The PLL locks the GATE turn-on edge to the rising edge of the external clock, enabling multi-phase or noise-sensitive system timing alignment - validated in the "Phase-Lockable Frequency" specification and Figure G20 (frequency vs temperature under sync).
LTC3864MPMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3864MPMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3864MPMSE#PBF 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#PBF reliable?
The price and inventory of LTC3864MPMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3864MPMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3864MPMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3864MPMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3864MPMSE#PBF?
LTC3864MPMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3864MPMSE#PBF 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#PBF?
For technical support, including LTC3864MPMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3864MPMSE#PBF requirements.
6.How does Aetrix verify that LTC3864MPMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3864MPMSE#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3864MPMSE#PBF?
All LTC3864MPMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3864MPMSE#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3864MPMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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