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Analog Devices Inc. LTC3864HMSE#PBF
- Part No.:
- LTC3864HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3864HMSE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:268
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Product details
Overview
LTC3864HMSE#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. It is designed for automotive power supplies requiring robust FMEA-verified fault tolerance and high-temperature reliability up to 150°C junction.
For engineers reviewing the LTC3864HMSE#PBF datasheet, LTC3864HMSE#PBF pinout, LTC3864HMSE#PBF application, or LTC3864HMSE#PBF equivalent, key selection considerations include its P-channel gate drive architecture, 100% duty cycle capability under low-VIN conditions, verified adjacent-pin open/short FMEA compliance, and thermal performance in the 12-lead MSOP package with exposed PGND pad.
Technical Context
The LTC3864HMSE#PBF 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 pin to set peak inductor current via a voltage-controlled comparator referenced to the SENSE pin differential.
It integrates a dedicated gate bias LDO (VIN–VCAP) regulated to 8.0V ±0.4V, supporting strong P-MOSFET turn-on even at low input voltages, and features dual light-load modes-Burst Mode (40µA IQ) and pulse-skipping-selected via the PLLIN/MODE pin. Frequency foldback activates below 0.4V on VFB to limit inductor current during short-circuit or startup overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports direct battery connection in 12V/24V/48V automotive and industrial systems without pre-regulation |
| Output Voltage Range | 0.8V to VIN - enables true dropout operation down to 100% duty cycle when VIN ≤ VOUT |
| Quiescent Current (Burst Mode) | 40µA typical - sustains ultra-low standby power in always-on vehicle modules |
| Switching Frequency Range | 50kHz to 850kHz - adjustable via external resistor on FREQ pin; enables EMI optimization and inductor size trade-offs |
| Operating Junction Temperature | –40°C to +150°C - qualified for under-hood automotive applications per H-grade specification |
| Current Limit Threshold | 95mV ±10mV on SENSE pin - sets accurate peak inductor current limit independent of temperature drift |
| Power Good Accuracy | ±10% window around 0.8V reference - provides reliable system-level power sequencing and fault detection |
Pinout & Package
The LTC3864HMSE#PBF 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 must be connected exclusively to power ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 13, Exposed Pad) | Power Ground Reference | Primary return path for high-current gate drive and power stage; must be low-impedance copper pour tied to system PGND |
| GATE (Pin 12) | P-Channel MOSFET Gate Driver Output | High-current source/sink driver (RUP = 2Ω, RDN = 0.9Ω) for external high-side switch |
| VIN (Pin 11) | Main Power Supply Input | Supplies internal circuitry and gate bias LDO; requires ≥0.1µF local ceramic bypass to PGND |
| SENSE (Pin 10) | Current Sense Differential Input | Kelvin-connected to sense resistor between VIN and switch node; sets 95mV current limit threshold |
| CAP (Pin 9) | Gate Bias LDO Output | Provides regulated (VIN–8V) gate drive supply; requires ≥0.47µF low-ESR ceramic capacitor to VIN |
| RUN (Pin 8) | Enable/Shutdown Control | Logic-compatible input with 1.26V enable threshold and 150mV hysteresis; draws only 7µA in shutdown |
| PGOOD (Pin 7) | Open-Drain Power Good Indicator | Asserts low when VFB deviates >±10% from 0.8V; includes 100µs delay for noise immunity |
| ITH (Pin 6) | Error Amplifier Output / Compensation Node | 0–2.9V control voltage setting peak current limit; connects to RC network for loop stability |
| VFB (Pin 5) | Feedback Voltage Input | Regulated to 0.800V ±0.008V; determines output voltage via external resistor divider |
| SS (Pin 4) | Soft-Start / Tracking Input | Internal 10µA pull-up enables linear ramp start-up; also accepts external tracking voltage |
| SGND (Pin 3) | Signal Ground Reference | Analog ground for VFB, ITH, SS, FREQ, PLLIN/MODE; must connect to PGND at single point only |
| FREQ (Pin 2) | Frequency Set Point Input | 20µA current source sets oscillator frequency via external resistor; ground = 350kHz, float = 535kHz |
| PLLIN/MODE (Pin 1) | External Clock Input / Light-Load Mode Select | Floating = Burst Mode (40µA IQ); grounded = pulse-skipping; driven = PLL synchronization (75–750kHz) |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Operation | Enables seamless transition into dropout when VIN drops below VOUT - critical for cold-crank automotive scenarios |
| FMEA-Verified Pin Fault Tolerance | Guaranteed safe operation during adjacent-pin open/short faults - meets ASIL-B functional safety requirements |
| Programmable Burst Mode IQ | 40µA quiescent current extends battery life in always-on telematics and ADAS modules |
| Integrated Gate Bias LDO | Regulates VIN–VCAP to 8.0V with <0.5V dropout - ensures strong P-MOSFET gate drive across full input range |
| Frequency Foldback Protection | Reduces switching frequency to ~18% of setpoint when VFB < 0.4V - limits inductor current during short-circuit |
| Accurate ±10% PGOOD Monitoring | Provides deterministic power sequencing and system-level fault signaling without external comparators |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module Supply |
|---|---|
Use Scenario: Powering 5V/2A SoC and memory subsystems in head units operating from 9V–16V battery with cold-crank dips to 3.5V. IC Role / Device Role / Timing Role: High-voltage step-down controller managing P-MOSFET switch, feedback regulation, and power sequencing via PGOOD. Use Value: 100% duty cycle maintains regulated output during 3.5V cold-crank events; H-grade 150°C rating ensures reliability in sealed enclosures. |
Use Scenario: Generating isolated 3.3V/1A supply for digital I/O logic in factory automation controllers exposed to 24V DC bus transients. IC Role / Device Role / Timing Role: Primary DC/DC controller delivering stable output despite 60V surge events on 24V rail. Use Value: 60V absolute max input withstands load-dump transients; FMEA-verified design reduces risk of cascading failure in safety-critical nodes. |
| Telecom Remote Radio Unit (RRU) | Distributed Power Architecture (DPA) |
Use Scenario: Intermediate 12V bus conversion from –48V telecom supply in outdoor base stations operating at –40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-efficiency buck controller driving discrete P-MOSFET, synchronized to system clock via PLLIN/MODE. Use Value: PLL synchronization eliminates beat frequencies in dense RF environments; 40µA Burst Mode minimizes standby loss in sleep-mode sectors. |
Use Scenario: Local point-of-load regulation from 12V intermediate bus to 1.2V/15A for FPGA core in modular server blades. IC Role / Device Role / Timing Role: Controller enabling scalable, thermally optimized buck stages using external high-side switch and Schottky catch diode. Use Value: Adjustable 50–850kHz frequency allows optimization for efficiency vs. size; MSOP package supports compact layout with thermal pad grounding. |
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 |
|---|---|---|---|
| LTC3891EMSE#PBF | Dual-output controller with integrated 5V bias supply; higher IQ (65µA); same 60V max input and 150°C H-grade option | Preferred where auxiliary 5V rail is needed for gate drivers or logic; less suitable for space-constrained single-rail designs | Select LTC3891EMSE#PBF if dual outputs or integrated bias supply reduce BOM count; otherwise LTC3864HMSE#PBF offers lower IQ and smaller footprint |
| MP24894GQKT-Z | Monolithic 60V buck converter (integrated MOSFETs); fixed 500kHz frequency; no 100% duty cycle or FMEA verification | Suitable for cost-sensitive, non-safety-critical applications where board space is premium and transient robustness is secondary | Choose MP24894GQKT-Z for simplified layout and lower component count; avoid where 100% duty cycle or automotive FMEA compliance is required |
Compared with LTC3891EMSE#PBF and MP24894GQKT-Z, the LTC3864HMSE#PBF uniquely combines 100% duty cycle operation, FMEA-verified fault tolerance, and industry-leading 40µA Burst Mode IQ in a thermally optimized MSOP package - making it the preferred choice for automotive and industrial applications demanding both reliability and ultra-low standby power.
Availability
LTC3864HMSE#PBF 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 long product lifecycles.
Supply support for LTC3864HMSE#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and aerospace markets.
The LTC3864HMSE#PBF belongs to Linear's high-voltage DC/DC controller product line, engineered specifically for automotive and industrial power systems requiring robust fault handling, wide input range, and extended temperature operation without derating.
FAQ
What is the maximum junction temperature rating for the LTC3864HMSE#PBF?
The LTC3864HMSE#PBF is rated for continuous operation up to +150°C junction temperature, meeting the H-grade qualification standard for under-hood automotive applications. This rating is verified across process corners and lifetime reliability testing, with thermal derating recommended above 125°C to ensure long-term operational integrity in high-ambient environments.
Does the LTC3864HMSE#PBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3864HMSE#PBF supports true 100% duty cycle operation when input voltage falls below the programmed output voltage. It achieves this by disabling PWM switching while maintaining gate drive high, allowing the P-channel MOSFET to remain fully enhanced - a critical feature for sustaining regulated output during automotive cold-crank events down to 3.5V.
How does the LTC3864HMSE#PBF achieve its 40µA quiescent current in Burst Mode?
The LTC3864HMSE#PBF achieves 40µA quiescent current in Burst Mode by disconnecting the error amplifier output from the ITH pin and placing internal circuitry-including the oscillator, gate driver, and current comparator-into a deep sleep state when load demand falls below threshold. Only essential bias currents remain active, enabling ultra-low standby power ideal for always-on vehicle modules.
What is the purpose of the exposed PGND pad (Pin 13) on the LTC3864HMSE#PBF MSOP package?
The exposed PGND pad (Pin 13) on the LTC3864HMSE#PBF serves as the primary thermal and electrical return path for high-current gate drive and power stage conduction. It must be soldered to a large PCB copper area tied to system power ground to achieve the specified θJA = 40°C/W and prevent thermal shutdown during sustained high-load operation.
Can the LTC3864HMSE#PBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC3864HMSE#PBF can be synchronized to an external clock applied to the PLLIN/MODE pin. Its phase-locked loop supports synchronization from 75kHz to 750kHz, with input thresholds of 2V (high) and 0.5V (low). This enables noise-sensitive systems to eliminate beat frequencies and align switching edges across multiple converters in distributed power architectures.
LTC3864HMSE#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:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3864HMSE#PBF FAQ
1.How can I place an order for LTC3864HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3864HMSE#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 LTC3864HMSE#PBF reliable?
The price and inventory of LTC3864HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3864HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3864HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3864HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3864HMSE#PBF?
LTC3864HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3864HMSE#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 LTC3864HMSE#PBF?
For technical support, including LTC3864HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3864HMSE#PBF requirements.
6.How does Aetrix verify that LTC3864HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3864HMSE#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 LTC3864HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3864HMSE#PBF?
All LTC3864HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3864HMSE#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 LTC3864HMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3864HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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