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Analog Devices Inc. LTC3864IMSE#PBF
- Part No.:
- LTC3864IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3864IMSE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:571
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Product details
Overview
LTC3864IMSE#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 front-end power supplies where wide VIN range and low IQ are critical.
For engineers reviewing the LTC3864IMSE#PBF datasheet, LTC3864IMSE#PBF pinout, LTC3864IMSE#PBF application, or LTC3864IMSE#PBF equivalent, key selection considerations include its P-MOSFET gate drive architecture, verified FMEA for adjacent-pin faults, ±10% PGOOD accuracy with 100µs delay, 95mV current sense threshold, and thermally enhanced 12-pin MSOP package with exposed PGND pad.
Technical Context
The LTC3864IMSE#PBF implements a constant-frequency peak current-mode control loop with slope compensation, using VFB as error amplifier input and ITH as transconductance output (1.8mS) tied to current limit setpoint. Its internal 8V LDO (VIN–VCAP) powers the high-side gate driver, enabling robust P-MOSFET turn-on even at low VIN.
It integrates dual light-load modes: Burst Mode (40µA IQ, floating PLLIN/MODE) and pulse-skipping (grounded PLLIN/MODE), with frequency foldback active below 0.4V on VFB to limit inductor current during short-circuit or startup. The 12-pin MSOP package features separate SGND and PGND pins with mandatory soldering of exposed PGND pad for thermal performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 60V - supports cold-crank automotive (4.5V) and industrial 48V bus without pre-regulation |
| Output Voltage Range | 0.8V to VIN - enables 100% duty cycle dropout for VIN < VOUT, e.g., 5V output from 3.8V input |
| Quiescent Current | 40µA in Burst Mode - sustains >1000h battery runtime in always-on automotive modules |
| Switching Frequency | 50kHz to 850kHz (resistor-programmable) - balances efficiency vs. size; 350kHz default when FREQ grounded |
| Current Sense Threshold | 95mV (typ) - sets precise peak inductor current limit via RSENSE = 95mV / ILPEAK |
| PGOOD Accuracy | ±10% window around 0.8V reference - ensures reliable system power sequencing with 100µs delay |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive environments per AEC-Q100 stress test conditions |
Pinout & Package
Package: 12-lead plastic MSOP with exposed PGND pad (Pin 13); requires PCB soldering of exposed pad for θJA = 40°C/W thermal performance and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 13) | Power Ground Reference | Exposed thermal pad; must be soldered to PCB ground plane for thermal dissipation and low-impedance return path for high-current switching |
| GATE (Pin 12) | P-Channel MOSFET Gate Driver Output | Drives external high-side P-MOSFET; regulated 8V gate bias (VIN–VCAP) enables strong turn-on even at low VIN |
| VIN (Pin 11) | Main Power Supply Input | Supplies internal circuitry and gate driver LDO; requires ≥0.1µF ceramic bypass to PGND |
| SENSE (Pin 10) | Current Sense Differential Input | Kelvin-connected to RSENSE across VIN–SENSE; 95mV threshold sets accurate peak current limit |
| CAP (Pin 9) | Gate Driver Bias Capacitor Terminal | Connect ≥0.47µF low-ESR ceramic between VIN and CAP to stabilize internal 8V LDO |
| RUN (Pin 8) | Enable/Shutdown Control | 1.26V threshold; internal 0.4µA pull-up allows direct connection to up to 60V supply |
| PGOOD (Pin 7) | Open-Drain Power Good Indicator | Pulled low when VFB deviates >±10% from 0.8V; 100µs delay prevents false triggering during transients |
| ITH (Pin 6) | Error Amplifier Output & Compensation Node | 0–2.9V range; connects to RC network for loop stability; 0.8V = zero-sense-current point |
| VFB (Pin 5) | Feedback Voltage Input | Regulated to 0.8V nominal; resistor divider from VOUT sets output voltage; <0.4V triggers frequency foldback |
| SS (Pin 4) | Soft-Start / Tracking Input | Internal 10µA pull-up charges external capacitor for controlled ramp; also accepts external voltage for output tracking |
| SGND (Pin 3) | Signal Ground Reference | Reference for all analog inputs (VFB, ITH, SS); must connect to PGND at single point only |
| FREQ (Pin 2) | Frequency Set Point Input | 20µA current source into RFREQ sets oscillator frequency; ground = 350kHz, open = 535kHz |
| PLLIN/MODE (Pin 1) | External Clock Input / Light-Load Mode Select | Floating = Burst Mode (40µA IQ); grounded = pulse-skipping; driven = PLL sync (75–750kHz) |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Operation | Enables seamless transition to dropout mode when VIN drops below VOUT - critical for automotive cold-crank survival |
| FMEA-Verified Pin Fault Tolerance | Validated for adjacent-pin open/short failure modes - meets ASIL-B functional safety requirements for automotive power rails |
| Programmable Burst Mode IQ | 40µA quiescent current extends battery life in always-on systems without sacrificing transient response |
| Integrated Gate Bias LDO | Regulates VIN–VCAP to 8V with 0.5V dropout - delivers strong gate drive for low-RDS(on) P-MOSFETs across full VIN range |
| Frequency Foldback Protection | Reduces switching frequency to ~18% of setpoint when VFB < 0.4V - limits inductor current during short-circuit without external components |
| Separate SGND/PGND Pins | Minimizes noise coupling between sensitive analog circuitry and high-current power paths - improves regulation accuracy and EMI |
Applications
| Automotive Front-End Power Supply | Industrial 24V/48V Distributed Power |
|---|---|
Use Scenario: Powering infotainment head units and ADAS ECUs from vehicle battery (5.5V–16V nominal, down to 3.5V during cranking). IC Role / Device Role / Timing Role: High-voltage step-down controller managing P-MOSFET switch, providing stable 5V/3.3V rails with 100% duty cycle support during cold-crank. Use Value: Maintains system operation below 4V input without brownout; 40µA Burst Mode IQ preserves battery during parking mode. |
Use Scenario: Converting 48V telecom or factory automation bus to 12V intermediate rail for downstream POL converters. IC Role / Device Role / Timing Role: Primary non-isolated buck controller with programmable 350kHz–850kHz frequency to optimize magnetics size and efficiency trade-off. Use Value: Wide 3.5V–60V input handles 48V transients; ±10% PGOOD ensures reliable sequencing with downstream DC/DCs. |
| Telecom Base Station Power | Heavy-Duty Equipment Power Management |
Use Scenario: Generating 5V/2A bias supply for RF amplifiers and FPGAs in outdoor base stations exposed to –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Robust current-mode controller with FMEA-verified fault tolerance and –40°C to +125°C junction rating. Use Value: Survives harsh thermal cycling; frequency foldback protects against sustained overloads without derating. |
Use Scenario: Powering control logic and sensors in mining equipment where input surges exceed 60V and ambient exceeds 85°C. IC Role / Device Role / Timing Role: High-reliability buck controller with 65V absolute max VIN rating and exposed PGND pad for forced-air cooling. Use Value: Withstands 48V bus transients up to 60V; 125°C operating temp supports convection-cooled enclosures. |
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 |
|---|---|---|---|
| LTC3891EMSE#PBF | Dual-output controller (1 main + 1 auxiliary); includes integrated 5V LDO; higher 75µA Burst Mode IQ | Suitable when secondary 5V rail needed for bias; less optimal for single-rail cost-sensitive designs | Select LTC3891 if auxiliary rail or integrated LDO reduces BOM count; otherwise LTC3864IMSE#PBF offers lower IQ and simpler layout |
| MPQ4316-AEC1 | Monolithic 60V buck converter (integrated MOSFETs); fixed 500kHz fSW; no 100% duty cycle; AEC-Q100 Grade 1 (–40°C to +125°C) | Replaces discrete controller+MOSFET solution; limited to ≤3A output; no programmable frequency or tracking | Choose MPQ4316-AEC1 for space-constrained automotive apps needing integration; LTC3864IMSE#PBF preferred when >3A, 100% duty cycle, or frequency flexibility required |
Compared with LTC3891EMSE#PBF and MPQ4316-AEC1, the LTC3864IMSE#PBF uniquely combines ultra-low 40µA Burst Mode IQ, verified FMEA fault tolerance, and true 100% duty cycle capability - making it optimal for automotive and industrial systems demanding highest reliability and lowest standby power.
Availability
LTC3864IMSE#PBF is available at Aetrix Electronics and suitable for automotive front-end power supplies, industrial 48V distributed power systems, and telecom base station bias rails requiring stable component supply across extended temperature ranges.
Supply support for LTC3864IMSE#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 and maintains its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3864IMSE#PBF belongs to Linear's high-voltage DC/DC controller family designed specifically for automotive, industrial, and telecom applications requiring wide input range, low IQ, and fault-resilient operation.
FAQ
What is the maximum input voltage rating for the LTC3864IMSE#PBF?
The LTC3864IMSE#PBF has an absolute maximum input voltage (VIN) rating of 65V, with continuous operation specified from 3.5V to 60V. This allows safe operation during 48V bus transients and automotive load-dump events up to 60V without external clamping.
Does the LTC3864IMSE#PBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3864IMSE#PBF supports true 100% duty cycle operation by disabling the gate driver when VIN falls below the programmed VOUT, allowing the output to follow VIN linearly. This is essential for automotive cold-crank survival where input may drop to 3.5V while maintaining regulated output.
How does the LTC3864IMSE#PBF achieve 40µA quiescent current, and what configuration enables it?
The LTC3864IMSE#PBF achieves 40µA quiescent current in Burst Mode operation, enabled by leaving the PLLIN/MODE pin floating. In this mode, the controller enters sleep state when VFB exceeds the 0.8V reference, disconnecting the error amplifier and powering down most internal circuitry while maintaining output regulation via output capacitance.
What is the purpose of the exposed PGND pad (Pin 13) on the LTC3864IMSE#PBF MSOP package?
The exposed PGND pad (Pin 13) on the LTC3864IMSE#PBF serves as both the primary thermal dissipation path and the low-impedance power ground return. It must be soldered to the PCB ground plane to achieve the specified θJA = 40°C/W and ensure stable gate driver operation under high-current switching conditions.
Can the LTC3864IMSE#PBF synchronize to an external clock, and what is its valid synchronization frequency range?
Yes, the LTC3864IMSE#PBF can synchronize to an external clock applied to the PLLIN/MODE pin. Its phase-locked loop operates reliably from 75kHz to 750kHz, with input logic thresholds of 2V (high) and 0.5V (low), enabling noise-immune clock distribution across multi-rail power systems.
LTC3864IMSE#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
LTC3864IMSE#PBF FAQ
1.How can I place an order for LTC3864IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3864IMSE#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 LTC3864IMSE#PBF reliable?
The price and inventory of LTC3864IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3864IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3864IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3864IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3864IMSE#PBF?
LTC3864IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3864IMSE#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 LTC3864IMSE#PBF?
For technical support, including LTC3864IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3864IMSE#PBF requirements.
6.How does Aetrix verify that LTC3864IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3864IMSE#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 LTC3864IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3864IMSE#PBF?
All LTC3864IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3864IMSE#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 LTC3864IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3864IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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