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Analog Devices Inc. LT8338JMSE#TRPBF
- Part No.:
- LT8338JMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8338JMSE#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 1.2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,955
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Product details
Overview
LT8338JMSE#TRPBF from Analog Devices is a monolithic synchronous boost converter IC designed for high-efficiency step-up regulation in wide-input industrial and battery-powered systems. It delivers up to 36V output from 3.0V–40V input, features 6µA quiescent current in Burst Mode®, supports 300kHz–3MHz adjustable switching frequency, and enters 100% duty cycle PassThru™ mode when VIN exceeds VOUT - enabling efficient preregulation in multi-rail power architectures.
For engineers reviewing the LT8338JMSE#TRPBF datasheet, LT8338JMSE#TRPBF pinout, LT8338JMSE#TRPBF application, or LT8338JMSE#TRPBF equivalent, key selection criteria include its 40V monolithic switch rating, 1.2A bottom-switch current limit, integrated soft-start and frequency foldback, 10-lead MSOP package with exposed thermal pad, and dual-mode light-load optimization (Burst vs pulse-skipping) via SYNC/MODE pin configuration.
Technical Context
The LT8338JMSE#TRPBF employs fixed-frequency current-mode control with internal slope compensation and programmable RT-based oscillator. Its dual-power-switch architecture integrates 240mΩ top and bottom MOSFETs, enabling synchronous operation without external diodes while supporting PassThru mode via gate-drive charge pump activation when VIN ≥ VOUT.
It implements three distinct light-load strategies: Burst Mode® (6µA IQ, <20mVP-P ripple), pulse-skipping (1.2mA IQ, lower audio noise), and spread-spectrum modulation (±14% fSW dither at 10kHz) - all selectable via SYNC/MODE pin biasing. Frequency foldback activates automatically as VIN approaches VOUT to maintain regulation under ultra-low duty-cycle conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 40V - supports direct connection to 24V/36V industrial rails and single-cell to 10-cell Li-ion stacks. |
| Output Voltage Range | Up to 40V - set by CTRL pin voltage ×18; internal 20MΩ divider enables precise feedback without external resistors. |
| Quiescent Current (Burst) | 6µA typical - sustains >90% efficiency at 1mA load, critical for always-on battery sensors and IoT endpoints. |
| Switching Frequency | 300kHz to 3MHz - set by RT resistor; higher frequencies allow smaller magnetics but increase switching losses. |
| PassThru Mode Threshold | VIN ≥ VOUT - eliminates switching loss during high-input conditions, reducing thermal stress and improving system efficiency. |
| Bottom Switch Limit | 1.2A minimum - defines maximum peak inductor current in boost mode; limits fault energy during short-circuit events. |
| Operating Junction Temp | –40°C to +150°C - J-grade qualification ensures reliability in automotive under-hood, industrial motor drives, and outdoor equipment. |
Pinout & Package
LT8338JMSE#TRPBF is housed in a 10-lead MSOP package (MSE) with exposed thermal pad (Pin 11 = GND), θJA = 40°C/W. The exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Input supply rail | Bypass with ≥0.1µF ceramic capacitor; supports 3V–40V input with internal LDO powering INTVCC. |
| BST (2) | Top switch gate driver supply | Connect 0.1µF capacitor between BST and SW to sustain MTOP gate drive during PassThru mode. |
| SW (3,4) | Switch node | High-dV/dt connection to inductor and boost capacitor; requires compact layout to minimize EMI. |
| VOUT (5) | Regulated output | Bypass with ≥4.7µF ceramic capacitor; internal 18:1 resistive divider feeds error amplifier. |
| SYNC/MODE (6) | Mode selection & sync input | Five configurations: GND (Burst), 100k-to-GND (Burst+SSFM), float (pulse-skip), INTVCC (pulse-skip+SSFM), external clock (sync). |
| RT (7) | Frequency set | Resistor to GND programs fSW from 300kHz–3MHz; determines slope compensation and minimum on-time. |
| EN/UVLO (8) | Enable & input UVLO | 1.0V threshold with 50mV hysteresis; enables VIN-programmable turn-on/off via resistor divider. |
| CTRL (9) | Reference input | Set VOUT = VCTRL × 18; tie to INTVCC divider; 1% resistors recommended for ±1% output accuracy. |
| INTVCC (10) | Internal 2.6V LDO output | Bypass with ≥2.2µF ceramic; powers internal circuitry; not for external loading. |
| GND (11) | Power and signal ground | Exposed pad - must be soldered to PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle PassThru™ Mode | Eliminates switching loss when VIN ≥ VOUT, enabling seamless transition between boost and direct conduction in preregulator stages. |
| Programmable Spread Spectrum Modulation | ±14% triangular dither at ~10kHz reduces peak EMI by >10dB without compromising regulation or efficiency. |
| Internal Soft-Start with VC Ramp Control | Gradually increases peak inductor current during startup, limiting inrush and preventing output overshoot or inductor saturation. |
| Frequency Foldback Near VOUT | Automatically lowers fSW as VIN approaches VOUT to maintain stable regulation under ultra-low duty-cycle constraints. |
| Monolithic 40V, 240mΩ Power Switches | Integrates matched top/bottom MOSFETs - no external FETs or diodes required, reducing BOM count and layout complexity. |
Applications
| Industrial Sensor Node Power | Automotive Camera Module Supply |
|---|---|
|
Use Scenario: Powering 3.3V/5V image sensor and ISP from a 12V vehicle battery with cold-crank tolerance down to 6V. IC Role / Device Role / Timing Role: Primary DC/DC regulator providing regulated 5V output with PassThru mode active above 5.5V battery voltage. Use Value: Maintains stable 5V output across 6V–16V battery range while minimizing heat generation during normal 12V operation. |
Use Scenario: Generating 12V rail for CMOS image sensor and lens actuator from 5V USB-PD or 3.3V system rail. IC Role / Device Role / Timing Role: Synchronous boost converter with Burst Mode® operation for low-noise, low-power standby imaging. Use Value: Achieves 6µA quiescent current and <20mVP-P ripple in standby, extending battery life in portable vision systems. |
| Portable Medical Instrument Boost | Industrial PLC I/O Channel Supply |
|
Use Scenario: Stepping up 3.7V Li-ion battery to 24V for piezoelectric actuator drivers in handheld diagnostic tools. IC Role / Device Role / Timing Role: High-voltage boost controller with 40V switch rating and internal soft-start for safe actuator energization. Use Value: Delivers 24V @ 300mA with controlled inrush, avoiding mechanical shock or audible coil whine during activation. |
Use Scenario: Providing isolated 24V field power from 5V logic rail in modular PLC backplane with strict EMI limits. IC Role / Device Role / Timing Role: EMI-optimized boost converter using spread-spectrum modulation and pulse-skipping mode. Use Value: Meets CISPR-22 Class B emissions without shielding or ferrites, simplifying enclosure design and certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8337JMSE#TRPBF | Same pinout, 2.5A bottom switch limit, 28V max VOUT, 3.5µA Burst IQ | Higher current, lower output voltage ceiling - suited for 12V/24V systems needing >1A load capability | Select when peak load exceeds 1.2A but VOUT ≤ 28V; shares same layout and control interface. |
| TPS61088RHLR | 20V max VOUT, 4.8A switch, 2.5µA shutdown IQ, no PassThru mode, QFN-16 package | Lacks VIN ≥ VOUT conduction path; optimized for high-current, low-VOUT portable apps rather than industrial preregulation | Choose for cost-sensitive, high-current 5V/12V boost where PassThru is unnecessary and thermal pad layout differs. |
Compared with LT8337JMSE#TRPBF, the LT8338JMSE#TRPBF trades peak current for higher output voltage (40V vs 28V) and adds PassThru functionality; versus TPS61088RHLR, it offers superior high-VOUT capability, integrated PassThru, and wider temperature grade - at the expense of higher minimum IQ in pulse-skip mode.
Availability
LT8338JMSE#TRPBF is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive camera modules, portable medical instruments, and PLC I/O channel supplies requiring stable component supply across extended temperature ranges.
Supply support for LT8338JMSE#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 industrial, automotive, communications, and healthcare markets.
The LT8338JMSE#TRPBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC converters, engineered specifically for rugged, wide-input industrial and automotive power conversion with emphasis on efficiency, EMI control, and thermal robustness.
FAQ
What is the maximum output voltage supported by the LT8338JMSE#TRPBF?
The LT8338JMSE#TRPBF supports output voltages up to 40V, as defined by its VOUT limit threshold of 40.2V (typical) and absolute maximum ratings. This is achieved by programming the CTRL pin voltage - VOUT = VCTRL × 18 - using an external resistor divider from INTVCC (2.6V) to GND. The internal 20MΩ feedback divider enables accurate regulation without additional external components in many configurations.
How does the LT8338JMSE#TRPBF enter and exit PassThru mode?
The LT8338JMSE#TRPBF enters 100% duty cycle PassThru mode automatically when VIN rises above the regulated VOUT voltage (set by CTRL). In this state, the top switch (MTOP) remains continuously on and the bottom switch (MBOT) stays off, effectively shorting VIN to VOUT through the inductor. It exits PassThru when VIN falls below VOUT or inductor reverse current exceeds ~300mA - resuming normal boost switching to maintain regulation.
What are the key differences between Burst Mode® and pulse-skipping operation on the LT8338JMSE#TRPBF?
Burst Mode® on the LT8338JMSE#TRPBF delivers single current pulses followed by sleep periods, achieving 6µA quiescent current and <20mVP-P ripple at light loads - ideal for battery longevity. Pulse-skipping keeps the oscillator running continuously, aligning all cycles to clock, resulting in ~1.2mA IQ but lower audio noise and reduced output ripple. Mode selection is controlled exclusively via the SYNC/MODE pin biasing configuration.
Can the LT8338JMSE#TRPBF be synchronized to an external clock, and what are the requirements?
Yes, the LT8338JMSE#TRPBF can be synchronized to an external clock applied to the SYNC/MODE pin. The input signal must have valleys below 0.8V and peaks above 2.0V, with minimum high/low pulse widths of 100ns each. Valid synchronization frequency range is 0.3MHz to 3.0MHz. When synchronized, the device operates in pulse-skipping mode and maintains slope compensation based on the RT resistor value.
What thermal considerations apply to the LT8338JMSE#TRPBF's MSOP package?
The LT8338JMSE#TRPBF uses a 10-lead MSOP package (MSE) with an exposed thermal pad (Pin 11 = GND) and θJA = 40°C/W. To ensure reliable operation at its full –40°C to +150°C junction temperature range, the exposed pad must be soldered to a dedicated PCB copper pour connected to system ground. Insufficient thermal relief or missing solder joints will cause premature thermal shutdown or accelerated parametric drift under sustained 1.2A load conditions.
LT8338JMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 40V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 300kHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT8338JMSE#TRPBF FAQ
1.How can I place an order for LT8338JMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8338JMSE#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 LT8338JMSE#TRPBF reliable?
The price and inventory of LT8338JMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8338JMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8338JMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8338JMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8338JMSE#TRPBF?
LT8338JMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8338JMSE#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 LT8338JMSE#TRPBF?
For technical support, including LT8338JMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8338JMSE#TRPBF requirements.
6.How does Aetrix verify that LT8338JMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8338JMSE#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 LT8338JMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8338JMSE#TRPBF?
All LT8338JMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8338JMSE#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 LT8338JMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8338JMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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