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Analog Devices Inc. LT8365HMSE#TRPBF
- Part No.:
- LT8365HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LT8365HMSE#TRPBF.pdf
- Description:
- IC REG BST SEPIC TRAN DRV 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,259
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Product details
Overview
LT8365HMSE#TRPBF from Analog Devices is a current-mode DC/DC converter IC with a 1.5A, 150V integrated power switch, supporting boost, SEPIC, and inverting topologies across a 2.8V–60V input range. It delivers ultralow 9µA quiescent current in Burst Mode, maintains <15mV output ripple, and operates up to 500kHz-enabling high-efficiency, high-voltage negative outputs such as –250V for medical imaging front-ends.
For engineers reviewing the LT8365HMSE#TRPBF datasheet, LT8365HMSE#TRPBF pinout, LT8365HMSE#TRPBF application, or LT8365HMSE#TRPBF equivalent, key selection considerations include its single FBX pin enabling both positive/negative output programming, programmable frequency (100–500kHz), SYNC/MODE pin-selectable operation modes (Burst, pulse-skipping, SSFM), BIAS pin for efficiency optimization, and AEC-Q100 qualification for automotive-grade thermal reliability (–40°C to 150°C).
Technical Context
The LT8365HMSE#TRPBF implements fixed-frequency current-mode control with external RT-resistor-programmable oscillator (100–500kHz) and dual-path error amplification-A1 active for boost/SEPIC (FBX referenced to +1.60V), A2 active for inverting (FBX referenced to –0.80V). Its unique single-feedback architecture eliminates topology-specific pins while maintaining precise regulation in all three configurations.
Protection logic includes overcurrent detection (3A fault threshold), thermal shutdown (>170°C), INTVCC UVLO (2.5V), and EN/UVLO hysteresis (1.60V turn-off / 1.68V turn-on). The BIAS pin enables dynamic sourcing of INTVCC from an auxiliary supply (4.4V ≤ BIAS ≤ VIN), reducing VIN load and improving full-load efficiency in SEPIC or inverting applications where VOUT exceeds VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8V to 60V - supports wide industrial, automotive, and telecom input rails without pre-regulation. |
| Switch Rating | 1.5A continuous, 150V breakdown - enables direct generation of high-voltage outputs like –250V in inverting mode. |
| Quiescent Current | 9µA in Burst Mode - sustains battery-powered operation for months in low-duty-cycle portable diagnostics. |
| Feedback Reference | +1.60V (boost/SEPIC) or –0.80V (inverting) - single FBX pin simplifies PCB layout and reduces BOM count across topologies. |
| Switching Frequency | 100kHz to 500kHz, programmable via RT resistor - balances EMI, size, and efficiency; supports synchronization to external clock. |
| Operating Temperature | –40°C to +150°C junction - qualified per AEC-Q100 Grade H for under-hood automotive and harsh-environment industrial use. |
| Package | 16-lead MSOP with 4 pins removed (MSE16) - thermally enhanced layout with exposed PGND/GND pad for >1W dissipation at θJC = 10°C/W. |
Pinout & Package
The LT8365HMSE#TRPBF is housed in a thermally enhanced 16-lead MSOP package (MSE16 variant), with pins 2, 4, 13, and 15 omitted to ensure ≥0.3mm creepage/clearance for 150V isolation. The exposed pad (Pin 17) is electrically connected to PGND/GND and must be soldered to a solid copper ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable and undervoltage lockout input | Resistive divider sets precise turn-on (1.68V) and turn-off (1.60V) thresholds; <0.2V reduces VIN current to <1µA for deep sleep. |
| VIN (Pin 2) | Main input supply | Accepts 2.8V–60V; powers internal circuitry unless BIAS supplies INTVCC; requires local ceramic bypass near PGND. |
| INTVCC (Pin 3) | Internal 3.8V LDO output | Supplies gate drivers and logic; must be bypassed with 1µF ceramic to GND; cannot be externally loaded or driven. |
| NC (Pin 4) | No internal connection | Left unconnected; no routing or copper required. |
| BIAS (Pin 5) | Auxiliary INTVCC supply input | When 4.4V ≤ BIAS ≤ VIN, diverts INTVCC current from VIN-critical for efficiency in SEPIC/inverting where VOUT > VIN. |
| VC (Pin 6) | Error amplifier output | Connects to external compensation network (R-C-RC); controls peak switch current via current-mode loop. |
| FBX (Pin 7) | Topology-agnostic feedback input | Regulates to +1.60V (positive VOUT) or –0.80V (negative VOUT); determines operating mode and modulates frequency during startup/fault. |
| RT (Pin 8) | Oscillator frequency programming | Resistor to GND sets fSW from 100kHz (432kΩ) to 500kHz (84.5kΩ); enables EMI optimization and clock synchronization. |
| SS (Pin 9) | Soft-start timing input | Capacitor to GND sets ramp rate of VC; 2µA charge current limits inrush; internal 220Ω MOSFET discharges on fault/shutdown. |
| SYNC/MODE (Pin 10) | Mode selection and clock sync | Five states: GND→Burst; float→pulse-skip; 100k-to-GND→Burst+SSFM; INTVCC→pulse-skip+SSFM; external clock→sync+pulse-skip. |
| SW1/SW2 (Pins 11,12) | Power switch drain terminals | Parallel-connected 150V/1.5A NMOS drains; minimized trace area reduces EMI; connect to inductor/diode node. |
| PGND/GND (Pin 17) | Power and signal ground | Exposed pad; primary thermal path and low-impedance return for SW, VIN, and FBX; must be soldered to large copper plane. |
Key Features
| Feature | Design Value |
|---|---|
| Single FBX pin for ±VOUT programming | Eliminates separate positive/negative feedback networks-reduces component count and layout complexity in multi-rail systems. |
| Burst Mode with 9µA IQ | Maintains regulation at microamp loads while holding output ripple <15mV-ideal for always-on sensor nodes and battery backup circuits. |
| Programmable spread-spectrum modulation | ±20% frequency dithering at fSW/256 reduces peak EMI by >10dB without altering filter design or layout. |
| BIAS pin for efficiency optimization | Shifts INTVCC load from VIN to auxiliary rail (e.g., VOUT in SEPIC), cutting total input current by up to 1.6mA at full load. |
| AEC-Q100 Grade H qualification | Validated for –40°C to +150°C operation with lifetime reliability data-meets automotive infotainment, ADAS, and body electronics requirements. |
Applications
| Medical Imaging Power Supply | Automotive LED Driver |
|---|---|
|
Use Scenario: Generating –250V bias for photomultiplier tubes (PMTs) in portable ultrasound and X-ray detectors. IC Role / Device Role / Timing Role: Inverting DC/DC controller regulating negative output with single FBX feedback and programmable soft-start. Use Value: 9µA quiescent current extends battery life between scans; 150V switch rating avoids cascaded stages; BIAS pin improves efficiency when powered from intermediate 12V rail. |
Use Scenario: Driving high-brightness LED strings in adaptive headlamps requiring 48V–60V output from 12V automotive battery. IC Role / Device Role / Timing Role: Boost converter with programmable frequency (250kHz) and SSFM to meet CISPR-25 Class 5 EMI limits. Use Value: AEC-Q100 Grade H ensures operation at 150°C under hood; SYNC pin allows alignment to vehicle clock domain; UVLO hysteresis prevents flicker during cold cranking. |
| Industrial Telecom Interface | Portable Diagnostic Equipment |
|
Use Scenario: Providing isolated ±15V and +48V rails for RS-485 transceivers and PoE-powered edge nodes. IC Role / Device Role / Timing Role: SEPIC controller enabling output voltage greater than input (e.g., 24V → 48V) with inherent input-output isolation. Use Value: Single FBX pin simplifies dual-rail feedback design; BIAS pin accepts 48V output to power INTVCC, eliminating dedicated LDO and saving >150mW. |
Use Scenario: Compact handheld blood analyzers requiring stable ±5V analog rails and 3.3V digital supply from single Li-ion cell. IC Role / Device Role / Timing Role: Dual-output inverting/boost controller with programmable soft-start to prevent sensor saturation during power-up. Use Value: 2.8V minimum input enables operation down to 3.0V battery; 16-lead MSE package fits <100mm² PCB area; Burst Mode extends runtime in standby mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EMSE#TRPBF | 4-switch synchronous buck-boost controller; no integrated switch; requires external MOSFETs; max 36V input. | Supports bidirectional power flow and higher efficiency (>95%) but needs 8 external FETs and complex gate drive layout. | Select when >3A output current or synchronous rectification is required; not suitable for space-constrained –250V inverting designs. |
| LT8330EMSE#TRPBF | 60V, 1.2A monolithic boost/SEPIC/inverting controller; 12µA Burst Mode IQ; no SSFM or BIAS pin; only 125°C max junction. | Lower voltage/current rating and missing SSFM limit EMI-sensitive medical/automotive use; lacks AEC-Q100 qualification. | Select for cost-sensitive, non-automotive applications below 60V input and 1.2A load; avoid where –250V or 150°C operation is needed. |
Compared with LTC3780EMSE#TRPBF and LT8330EMSE#TRPBF, the LT8365HMSE#TRPBF uniquely combines 150V switching, integrated 1.5A FET, AEC-Q100 Grade H rating, and SSFM in a single MSE package-making it the only option for compact, high-reliability, high-voltage inverting supplies in automotive and medical diagnostics.
Availability
LT8365HMSE#TRPBF is available at Aetrix Electronics and suitable for medical imaging power supplies, automotive LED drivers, industrial telecom interfaces, and portable diagnostic equipment requiring stable component supply with guaranteed long-term availability.
Supply support for LT8365HMSE#TRPBF 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 precision instrumentation, industrial automation, and automotive safety markets.
The LT8365HMSE#TRPBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC converters, designed specifically for high-voltage, wide-input, low-quiescent-current applications in harsh environments-including automotive, medical, and industrial systems demanding AEC-Q100 compliance and extended temperature operation.
FAQ
What is the maximum output voltage achievable with the LT8365HMSE#TRPBF in inverting configuration?
The LT8365HMSE#TRPBF supports inverting operation with a 150V-rated internal switch, enabling output voltages up to –250V as demonstrated in the datasheet's typical application (TA01a). This capability relies on proper external component selection-including high-voltage diodes (e.g., DFLS1150) and appropriately rated capacitors-and adherence to minimum off-time and duty cycle constraints. Output voltage is set via the FBX feedback divider referenced to –0.80V.
How does the BIAS pin improve efficiency in SEPIC applications using the LT8365HMSE#TRPBF?
In SEPIC configurations where VOUT exceeds VIN (e.g., 12V input → 24V output), the LT8365HMSE#TRPBF's BIAS pin can be connected to VOUT to supply the INTVCC regulator. This shifts the ~1.2mA INTVCC load from VIN to VOUT, reducing input current draw and improving overall system efficiency by up to 0.8% at full load. The BIAS pin activates when 4.4V ≤ BIAS ≤ VIN, and requires local 1µF ceramic decoupling.
Can the LT8365HMSE#TRPBF synchronize to an external clock while operating in Burst Mode?
No-the LT8365HMSE#TRPBF disables Burst Mode when the SYNC/MODE pin is driven by an external clock. In synchronized operation, it defaults to pulse-skipping mode to maintain regulation alignment with the external clock edges. Burst Mode is only active when SYNC/MODE is pulled low (<0.14V) or configured via 100k-to-GND for Burst+SSFM. For low-EMI, low-IQ operation, use the 100k-to-GND configuration instead of direct clock sync.
What is the purpose of the four omitted pins in the LT8365HMSE#TRPBF's MSOP package?
The LT8365HMSE#TRPBF uses a modified 16-lead MSOP package (MSE16) with pins 2, 4, 13, and 15 physically removed to increase creepage and clearance distances between high-voltage nodes-specifically between SW and GND/EN/UVLO. This modification ensures safe operation at 150V switch voltage while maintaining industry-standard MSOP footprint compatibility and thermal performance via the exposed PGND/GND pad.
Does the LT8365HMSE#TRPBF require different compensation networks for boost versus inverting configurations?
Yes-the LT8365HMSE#TRPBF uses distinct error amplifier paths: A1 (inverting gain) for boost/SEPIC (FBX referenced to +1.60V) and A2 (non-inverting gain) for inverting (FBX referenced to –0.80V). Each path has different transconductance (75µA/V vs. 60µA/V) and voltage gain (185V/V vs. 145V/V), requiring separate compensation networks on the VC pin. The datasheet provides design equations and stability guidelines specific to each topology.
LT8365HMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Output Type:
- Transistor Driver
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.8V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- 150V (Switch)
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 100kHz ~ 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8365HMSE#TRPBF FAQ
1.How can I place an order for LT8365HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8365HMSE#TRPBF 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 LT8365HMSE#TRPBF reliable?
The price and inventory of LT8365HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8365HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8365HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8365HMSE#TRPBF transactions.
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4.How is shipping managed for LT8365HMSE#TRPBF?
LT8365HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8365HMSE#TRPBF 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 LT8365HMSE#TRPBF?
For technical support, including LT8365HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8365HMSE#TRPBF requirements.
6.How does Aetrix verify that LT8365HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8365HMSE#TRPBF 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 LT8365HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8365HMSE#TRPBF?
All LT8365HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8365HMSE#TRPBF, 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 LT8365HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8365HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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