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Analog Devices Inc. LT8361HMSE#PBF
- Part No.:
- LT8361HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LT8361HMSE#PBF.pdf
- Description:
- IC REG BST SEPIC ADJ 2A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,860
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Product details
Overview
LT8361HMSE#PBF from Analog Devices is a current-mode DC/DC converter with integrated 100V, 2A power switch, operating from 2.8V to 60V input. It supports boost, SEPIC, and inverting topologies via single FBX pin, delivers ≤9µA quiescent current in Burst Mode, and maintains <15mV output ripple. It is used in automotive infotainment power supplies requiring high-voltage input tolerance and low-noise operation.
For engineers reviewing the LT8361HMSE#PBF datasheet, LT8361HMSE#PBF pinout, LT8361HMSE#PBF application, or LT8361HMSE#PBF equivalent, key selection considerations include its –40°C to 150°C junction temperature rating, programmable 300kHz–2MHz switching frequency, BIAS pin for efficiency optimization, SYNC/MODE pin for EMI-reducing spread-spectrum modulation, and AEC-Q100 qualification for automotive use.
Technical Context
The LT8361HMSE#PBF implements fixed-frequency current-mode control with external RT resistor programming and dual-path error amplification (1.60V for positive outputs, –0.80V for negative outputs). Its architecture enables seamless topology reconfiguration without hardware changes.
It integrates frequency foldback, programmable soft-start (2µA charge current), and five selectable operating modes via SYNC/MODE pin - including Burst Mode (≤9µA IQ), pulse-skip, external synchronization, and spread-spectrum modulation - all while maintaining stable regulation across 2.8V–60V input and up to 100V output swing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8V to 60V - supports wide-range industrial and automotive battery inputs including 12V, 24V, and 48V systems. |
| Switch Rating | 100V, 2A - enables high-step-up ratios (e.g., 12V→48V) and robust operation under load dump transients. |
| Quiescent Current | 9µA in Burst Mode - sustains ultra-low power consumption during standby in always-on vehicle modules. |
| Switching Frequency | 300kHz to 2MHz - adjustable via RT resistor; allows EMI optimization and compact magnetics selection. |
| Feedback Reference | +1.60V (boost/SEPIC) or –0.80V (inverting) - single FBX pin supports polarity-agnostic output programming. |
| Junction Temp Range | –40°C to +150°C - H-grade rating qualified per AEC-Q100 Grade 1, suitable for under-hood automotive applications. |
| Package Thermal Resistance | θJA = 45°C/W, θJC = 10°C/W - thermally enhanced MSOP-16 with exposed PGND pad for efficient heat dissipation. |
Pinout & Package
LT8361HMSE#PBF is housed in a 16-lead plastic MSOP package with four pins removed (MSE16 variant) to ensure high-voltage spacing between SW and adjacent terminals. The exposed pad (Pin 17) is connected internally to PGND/GND and must be soldered to a continuous PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO | Enable and undervoltage lockout input | Programmable turn-on/off thresholds (1.576V rising, 1.545V falling) with 80mV hysteresis; draws <1µA when pulled below 0.2V. |
| VIN | Main input supply | Accepts 2.8V–60V; powers internal circuitry unless BIAS is active; requires local ceramic bypass near pin. |
| SW1/SW2 | Power switch output | Drives external inductor/diode network; rated 100V/2A; minimize trace area to reduce EMI. |
| FBX | Feedback regulation input | Single pin accepts voltage divider from output; selects +1.60V or –0.80V reference based on topology polarity. |
| BIAS | Secondary supply for INTVCC | Accepts 4.4V–VIN to offload INTVCC current from VIN, improving full-load efficiency in SEPIC/boost configurations. |
| SYNC/MODE | Mode selection and clock sync input | Five states: GND = Burst Mode; float = pulse-skip; 100k-to-GND = Burst+SSFM; INTVCC = pulse-skip+SSFM; external clock = sync+pulse-skip. |
| RT | Frequency programming | Resistor to GND sets fSW from 300kHz (165kΩ) to 2MHz (20kΩ); formula: RT(kΩ) = 51.2/fOSC(MHz) – 5.6. |
| SS | Soft-start timing | Capacitor to GND controls inrush current ramp rate; 2µA constant-current charge; internal 220Ω pull-down during fault. |
| VC | Error amplifier output | Connects to external compensation network (R-C series to GND); sets loop bandwidth and stability margin. |
| PGND/GND | Power and signal ground | Exposed pad (Pin 17) is primary thermal path and low-impedance return for SW and input/output capacitors. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single FBX pin enables boost, SEPIC, or inverting operation without changing IC - reduces BOM count and layout variants. |
| Low-EMI Operation | Spread-spectrum modulation (±14–28% ∆f/fOSC) and external clock synchronization suppress narrowband EMI peaks in automotive EMC testing. |
| High-Temp Reliability | AEC-Q100 Grade 1 qualification (–40°C to +150°C) with guaranteed performance over full junction range - validated for engine control and ADAS power rails. |
| Efficiency Optimization | BIAS pin allows >90% efficiency at 400mA output with 12V→24V SEPIC by sourcing INTVCC from VOUT instead of VIN. |
| Light-Load Regulation | Burst Mode maintains ±1% output accuracy with <15mV ripple at 1mA load - critical for always-on telematics and sensor bias supplies. |
Applications
| Automotive Infotainment Power | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Generating isolated 24V rail from 12V vehicle battery for LCD backlight drivers and audio amplifiers. IC Role / Device Role / Timing Role: Primary DC/DC controller implementing SEPIC topology to tolerate cold-crank (4.5V) and load-dump (60V) transients. Use Value: 9µA quiescent current prevents battery drain during vehicle sleep mode; 150°C rating ensures reliability near dashboard electronics. |
Use Scenario: Providing negative bias voltage for precision op-amps and ADC front-ends in 4–20mA loop-powered sensors. IC Role / Device Role / Timing Role: Inverting converter generating –15V from 24V industrial bus, with programmable soft-start to avoid sensor reset during power-up. Use Value: Single FBX pin simplifies design vs dual-rail controllers; BIAS pin improves efficiency when VOUT < VIN in distributed sensor nodes. |
| Medical Portable Diagnostic Imaging | Telecom Remote Radio Unit (RRU) |
Use Scenario: Powering CCD/CMOS image sensor bias supplies in handheld ultrasound devices requiring low-noise, low-ripple rails. IC Role / Device Role / Timing Role: Boost converter delivering 36V from single-cell Li-ion (3.0–4.2V), operating in Burst Mode during idle scanning intervals. Use Value: <15mV output ripple prevents image noise artifacts; 2A switch supports fast frame-rate sensor burst modes. |
Use Scenario: Generating 48V intermediate bus from –48V telecom rectifier output for GaN PA bias sequencing in 5G small cells. IC Role / Device Role / Timing Role: Inverting configuration converting –48V to +48V with SSFM enabled to meet EN55032 Class A conducted emissions limits. Use Value: Spread-spectrum modulation reduces peak EMI by 10dB compared to fixed-frequency operation - avoids costly shielding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EMSE#PBF | Requires external MOSFETs; no integrated 100V switch; supports synchronous rectification. | Better efficiency above 2A load but needs more board space and gate-drive design effort. | Select when >2A output current or >95% efficiency at full load is required; not drop-in for LT8361HMSE#PBF layouts. |
| MAX20404ATPA/VY+ | Integrated 60V/3.5A switch; fixed 2.1MHz frequency; no BIAS pin or SSFM; lower max input voltage. | Smaller solution size for 12V→24V boost but lacks automotive temp grade and AEC-Q100 certification. | Select for cost-sensitive consumer portables where 150°C rating and spread-spectrum EMI control are not needed. |
Compared with LTC3789EMSE#PBF and MAX20404ATPA/VY+, the LT8361HMSE#PBF uniquely combines 100V integration, AEC-Q100 Grade 1 qualification, and multi-topology flexibility in a single MSOP package - making it optimal for space-constrained, high-reliability automotive and industrial converters where input transients exceed 60V.
Availability
LT8361HMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor transmitters, portable medical imaging devices, and telecom remote radio units requiring stable component supply across extended temperature and high-voltage stress conditions.
Supply support for LT8361HMSE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8361HMSE#PBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC controllers, designed specifically for demanding automotive and industrial applications requiring wide input range, low IQ, and robust transient immunity.
FAQ
What is the maximum junction temperature specification for LT8361HMSE#PBF?
The LT8361HMSE#PBF is rated for a maximum junction temperature of +150°C and is guaranteed over the full –40°C to +150°C operating range per AEC-Q100 Grade 1. This specification is validated through production testing and thermal characterization - not derated or extrapolated. The LT8361HMSE#PBF achieves this rating using its thermally enhanced MSOP package with exposed PGND pad, which provides θJC = 10°C/W for direct die-to-PCB heat transfer.
How does the LT8361HMSE#PBF support both positive and negative output voltages?
The LT8361HMSE#PBF uses a dual-reference error amplifier architecture: it regulates to +1.60V at the FBX pin for boost and SEPIC topologies (positive outputs), and to –0.80V for inverting configurations (negative outputs). The IC automatically selects the appropriate reference based on FBX voltage polarity and topology wiring - no external mode-select signals or configuration registers are required. This capability is intrinsic to the LT8361HMSE#PBF's internal block diagram and is verified across all operating conditions.
Can the LT8361HMSE#PBF be synchronized to an external clock, and what are the voltage requirements?
Yes, the LT8361HMSE#PBF supports external clock synchronization via the SYNC/MODE pin. The input square wave must have valleys below 0.4V and peaks above 1.7V (up to 6V), with 20–80% duty cycle. Synchronization is supported from 300kHz to 2MHz. When synchronized, the LT8361HMSE#PBF operates in pulse-skip mode - not Burst Mode - to maintain regulation alignment with the external clock. This behavior is specified in the Pin Functions section of the official datasheet.
What is the purpose of the BIAS pin on the LT8361HMSE#PBF, and how does it improve efficiency?
The BIAS pin on the LT8361HMSE#PBF supplies the internal INTVCC regulator when 4.4V ≤ BIAS ≤ VIN, diverting up to ~1.2mA of bias current away from the main VIN rail. In SEPIC applications where VOUT < VIN (e.g., 24V input → 15V output), connecting BIAS to VOUT reduces total input current and improves full-load efficiency by 2–3 percentage points. This function is implemented via internal comparator circuitry and is independent of external components - no additional logic or control is needed to enable it.
Does the LT8361HMSE#PBF include built-in protection features, and which ones are active?
Yes, the LT8361HMSE#PBF includes multiple hardware-based protections: undervoltage lockout on EN/UVLO (<1.6V), INTVCC UVLO (~2.5V), overtemperature shutdown (>170°C junction), switch overcurrent limit (3.75A threshold), and soft-start fault reset (SS pin discharge on fault). All protections are implemented in analog circuitry with no software dependency. When triggered, they immediately disable switching and pull down the SS pin to prevent output overshoot - behavior confirmed in the Applications Information section and typical performance curves.
LT8361HMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.8V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- 100V (Switch)
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 300kHz ~ 2MHz
- Synchronous Rectifier:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8361HMSE#PBF FAQ
1.How can I place an order for LT8361HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8361HMSE#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 LT8361HMSE#PBF reliable?
The price and inventory of LT8361HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8361HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8361HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8361HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8361HMSE#PBF?
LT8361HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8361HMSE#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 LT8361HMSE#PBF?
For technical support, including LT8361HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8361HMSE#PBF requirements.
6.How does Aetrix verify that LT8361HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8361HMSE#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 LT8361HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8361HMSE#PBF?
All LT8361HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8361HMSE#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 LT8361HMSE#PBF part is unused and in its original packaging.
Return procedure for LT8361HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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