My Inquiry
My Account
Analog Devices Inc. LTC3864EMSE#PBF
- Part No.:
- LTC3864EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3864EMSE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,597
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3864EMSE#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 used in automotive power supplies where wide VIN range and fault-resilient regulation are critical.
For engineers reviewing the LTC3864EMSE#PBF datasheet, LTC3864EMSE#PBF pinout, LTC3864EMSE#PBF application, or LTC3864EMSE#PBF equivalent, key selection criteria include verified FMEA compliance for adjacent-pin faults, ±10% PGOOD accuracy with 100µs delay, 95mV current sense threshold, 8V gate bias LDO (VIN–VCAP), and thermally enhanced 12-lead MSOP package with exposed PGND pad.
Technical Context
The LTC3864EMSE#PBF implements a constant-frequency, peak current-mode control architecture with transconductance error amplifier (1.8mS), slope compensation, and internal 20µA FREQ-set current source. Its PLLIN/MODE pin serves dual function: external clock synchronization (75kHz–750kHz) or Burst/Pulse-Skipping mode selection.
It features integrated UVLO with 3.25V (typ) turn-on hysteresis, frequency foldback triggered at VFB < 0.4V (18% of set frequency), and robust gate drive with 2Ω pull-up / 0.9Ω pull-down resistance. The 100% duty cycle capability is enabled by direct P-MOSFET control and VIN-referenced CAP bias supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports cold-crank automotive (≥4.5V) and industrial 48V systems without pre-regulation |
| Output Voltage Range | 0.8V to VIN - enables true dropout operation down to 0V differential, critical for battery backup and low-VIN recovery |
| Quiescent Current | 40µA in Burst Mode - sustains >1000-hour standby in always-on automotive modules with 10µF output cap |
| Switching Frequency | 50kHz to 850kHz (resistor-programmable) - balances EMI, efficiency, and inductor size across 12V/24V/48V inputs |
| Current Sense Threshold | 95mV (typ) - sets precise peak inductor current limit independent of temperature drift (±3mV over –40°C to 125°C) |
| PGOOD Accuracy | ±10% window around 0.8V reference - ensures reliable system enable/disable sequencing within ASIL-B compatible power trees |
| Thermal Package | 12-Lead MSOP with exposed PGND pad (θJA = 40°C/W) - delivers 2A continuous output with ≤25°C rise at 1W dissipation on 2oz copper |
Pinout & Package
Package: 12-lead plastic MSOP (4mm × 3mm) with exposed PGND pad (Pin 13), rated for –40°C to 125°C junction temperature. Exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PLLIN/MODE | External clock sync input / light-load mode select | Floating = 40µA Burst Mode; grounded = Pulse-Skipping; 2V–6V AC = PLL lock to 75–750kHz external clock |
| 2 - FREQ | Switching frequency programming node | 20µA current source sets fSW = 50–850kHz via RFREQ; grounded = 350kHz fixed; floating = 535kHz fixed |
| 3 - SGND | Analog signal ground reference | Must connect to PGND at single point only - prevents noise coupling into VFB, ITH, SS compensation paths |
| 4 - SS | Soft-start and output tracking control | Internal 10µA pull-up charges external CSS; voltage < 0.8V forces VFB regulation to SS value for controlled ramp or tracking |
| 5 - VFB | Feedback voltage sense input | Regulates to 0.8V ±1%; < 0.4V triggers frequency foldback; open-drain PGOOD asserts when outside ±10% window |
| 6 - ITH | Error amplifier output & current threshold | 0–2.9V range maps to 0–100% current limit; used for loop compensation (CITH1/RITH) and current limiting |
| 7 - PGOOD | Power-good open-drain status output | Pulled low if VFB out-of-window or RUN = low; 100µs delay prevents false toggling during transient load steps |
| 8 - RUN | Enable/disable logic control | 1.26V threshold with 150mV hysteresis; internal 0.4µA pull-up allows direct connection to 60V supply |
| 9 - CAP | GATE driver bias supply return | Requires ≥0.47µF ceramic between VIN and CAP; regulates VIN–VCAP to 8V (LDO) for efficient P-MOSFET drive |
| 10 - SENSE | Current sense differential input | Kelvin-connected to RSENSE; 95mV threshold sets ILIM = 95mV/RSENSE; rejects common-mode noise up to 6V |
| 11 - VIN | Main power supply input | Supplies internal circuitry and CAP LDO; requires ≥0.1µF local ceramic bypass to PGND |
| 12 - GATE | P-channel MOSFET gate driver output | 2Ω pull-up / 0.9Ω pull-down; disables if VIN–VCAP < 3.25V (typ); drives 1nF gate capacitance with <220ns min on-time |
| 13 - PGND | Power ground reference | Exposed pad - mandatory solder connection to PCB thermal plane; carries high di/dt return current for GATE and SENSE paths |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enables seamless transition from regulation to dropout when VIN drops below VOUT - eliminates output collapse in automotive cold-crank events |
| FMEA-verified adjacent-pin fault tolerance | Guaranteed safe operation under short/open faults between any two pins - meets ISO 26262 ASIL-B functional safety requirements |
| Programmable frequency foldback | Reduces switching frequency to ~18% of setpoint when VFB < 0.4V - limits inrush and short-circuit current without external current limiting |
| Low-noise Burst Mode® | 40µA IQ with discontinuous conduction - maintains <15mVpp output ripple at 10mA load while avoiding audible switching noise |
| Accurate ±10% PGOOD with delay | 100µs response time prevents false resets during fast load transients; supports deterministic power sequencing in multi-rail systems |
| Thermally enhanced MSOP package | Exposed PGND pad reduces θJA to 40°C/W - enables 2A output at full ambient without heatsink in compact automotive ECUs |
Applications
| Automotive Body Control Module (BCM) | Industrial 24V Distributed Power Rail |
|---|---|
Use Scenario: Powering microcontrollers, CAN transceivers, and sensor interfaces in door modules under cold-crank (4.5V) and load-dump (60V) conditions. IC Role / Device Role / Timing Role: Primary step-down controller regulating 5V/2A from vehicle battery; provides 100% duty cycle during cranking to maintain MCU operation. Use Value: Eliminates need for external LDO post-regulator; FMEA verification ensures fail-safe behavior during wiring harness faults. |
Use Scenario: Generating stable 3.3V/2A for PLC I/O modules powered from unregulated 24V factory bus with ±20% tolerance. IC Role / Device Role / Timing Role: High-efficiency buck controller with programmable 350kHz frequency to avoid AM radio band; tracks upstream 5V rail during hot-swap insertion. Use Value: 40µA Burst Mode extends battery backup runtime; PGOOD enables coordinated shutdown of field devices before brownout. |
| Telecom Remote Radio Unit (RRU) | Medical Portable Diagnostic Device |
Use Scenario: Converting -48V telecom supply to +5V for FPGA and ADCs in outdoor base station radios exposed to –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Negative-input capable controller (via level-shifted SENSE) delivering regulated 5V with ±10mV line/load regulation over full temperature range. Use Value: Verified FMEA and 125°C rating ensure reliability in sealed enclosures; frequency synchronization eliminates beat frequencies with other system clocks. |
Use Scenario: Powering low-noise analog front-end and Bluetooth SoC in handheld ultrasound probe requiring silent operation and 72-hour battery life. IC Role / Device Role / Timing Role: Ultra-low-IQ buck controller operating in Burst Mode at 100µA load; soft-start prevents inrush into sensitive analog circuits. Use Value: 40µA IQ doubles battery life vs. standard controllers; low EMI design avoids interference with 2–15MHz ultrasound signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3892EMSE#PBF | Dual-output, 60V input, 3.5µA shutdown IQ, no Burst Mode (only pulse-skipping), 12-lead MSOP | Required for dual-rail systems (e.g., ±12V analog supplies); lacks 40µA light-load efficiency | Select when needing two independent outputs with tight cross-regulation; not drop-in for single-output LTC3864EMSE#PBF designs |
| MP2482DS-LF-Z | 60V input, integrated 140mΩ N-MOSFET, 1.2A max, 300µA IQ, no 100% duty cycle, SOIC-8 | Lower cost for <1.2A loads; no external P-MOSFET flexibility or FMEA verification | Choose for space-constrained, cost-sensitive non-safety-critical applications where 100% duty cycle is unnecessary |
Compared with LTC3864EMSE#PBF, LTC3892EMSE#PBF adds dual-output capability but sacrifices ultra-low IQ and FMEA validation, while MP2482DS-LF-Z integrates power switches at the expense of design flexibility, dropout performance, and functional safety assurance.
Availability
LTC3864EMSE#PBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial 24V distributed power rails, and telecom remote radio units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3864EMSE#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, and communications markets.
The LTC3864EMSE#PBF belongs to Linear's high-voltage DC/DC controller product line, designed specifically for fault-tolerant, wide-input automotive and industrial power conversion where reliability under extreme voltage transients is mandatory.
FAQ
What is the maximum input voltage rating for the LTC3864EMSE#PBF?
The LTC3864EMSE#PBF has an absolute maximum input supply voltage (VIN) rating of 65V, with guaranteed operational range from 3.5V to 60V. This allows it to withstand automotive load-dump transients (ISO 7637-2 Pulse 5a, up to 60V) while maintaining regulation. Operation above 60V is not specified and may cause permanent damage per Absolute Maximum Ratings.
Does the LTC3864EMSE#PBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3864EMSE#PBF supports true 100% duty cycle operation by directly controlling an external P-channel MOSFET. When VIN drops below the programmed VOUT, the controller holds GATE low continuously, maintaining output regulation without collapse. This is enabled by its VIN-referenced CAP bias supply and gate driver architecture - no external components are required to achieve dropout operation.
How does the Burst Mode operation of the LTC3864EMSE#PBF achieve 40µA quiescent current?
The LTC3864EMSE#PBF achieves 40µA quiescent current in Burst Mode by disconnecting the error amplifier output from the ITH pin and disabling most internal circuitry (oscillator, gate driver, comparators) when load current falls below threshold. The ITH pin is held at 0.55V, and the controller wakes only when output droop causes VFB to fall sufficiently - minimizing average supply current while maintaining regulation.
What is the purpose of the exposed pad (Pin 13) on the LTC3864EMSE#PBF MSOP package?
The exposed pad (Pin 13) on the LTC3864EMSE#PBF is designated PGND and serves as the primary power ground return path. It must be soldered to a PCB thermal plane to achieve the specified θJA = 40°C/W and ensure safe operation at full load. Failure to connect this pad results in excessive junction temperature rise and potential thermal shutdown or reliability degradation.
Can the LTC3864EMSE#PBF be synchronized to an external clock, and what are the valid frequency and voltage levels?
Yes, the LTC3864EMSE#PBF can be synchronized to an external clock applied to the PLLIN/MODE pin. Valid synchronization range is 75kHz to 750kHz. Input voltage levels require VIH ≥ 2V and VIL ≤ 0.5V. The internal PLL aligns the GATE turn-on edge to the rising edge of the external clock, enabling noise-sensitive systems to avoid beat frequencies and meet strict EMI requirements.
LTC3864EMSE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3864EMSE#PBF FAQ
1.How can I place an order for LTC3864EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3864EMSE#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 LTC3864EMSE#PBF reliable?
The price and inventory of LTC3864EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3864EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3864EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3864EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3864EMSE#PBF?
LTC3864EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3864EMSE#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 LTC3864EMSE#PBF?
For technical support, including LTC3864EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3864EMSE#PBF requirements.
6.How does Aetrix verify that LTC3864EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3864EMSE#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 LTC3864EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3864EMSE#PBF?
All LTC3864EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3864EMSE#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 LTC3864EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3864EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3864EMSE#PBF 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…
