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Analog Devices Inc. LT8338JMSE#PBF
- Part No.:
- LT8338JMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8338JMSE#PBF.pdf
- Description:
- IC REG BOOST ADJ 1.2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,670
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Product details
Overview
LT8338JMSE#PBF from Analog Devices is a monolithic synchronous boost converter IC designed for high-efficiency DC/DC conversion in space-constrained, wide-input industrial and battery-powered systems. It delivers up to 1.2A output current, supports 3.0V–40V input and up to 40V output, operates with 6µA quiescent current in Burst Mode®, and features 100% duty cycle PassThru™ mode for preregulation applications.
For engineers reviewing the LT8338JMSE#PBF datasheet, LT8338JMSE#PBF pinout, LT8338JMSE#PBF application, or LT8338JMSE#PBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-ready availability details - all grounded in the official Rev. B datasheet and Analog Devices' product documentation.
Technical Context
The LT8338JMSE#PBF implements fixed-frequency current-mode control with internal slope compensation, enabling stable regulation across wide VIN–VOUT differentials. Its dual MOSFET power stage integrates 240mΩ top and bottom switches, supports programmable switching frequency (300kHz–3MHz via RT resistor), and includes frequency foldback to maintain regulation as VIN approaches VOUT.
It features three operational modes selected via SYNC/MODE pin: Burst Mode® (6µA IQ, <20mVP-P ripple), pulse-skipping (lower ripple, ~1.5mA IQ), and spread-spectrum-modulated variants. The EN/UVLO pin provides accurate 1.000V threshold with 50mV hysteresis for programmable input UVLO or shutdown, while the CTRL pin sets VOUT via an 18× internal divider ratio.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 40V - supports direct connection to 12V/24V industrial rails, Li-ion stacks, and automotive batteries without pre-regulation. |
| Output Voltage Range | Up to 40V - set precisely via CTRL pin voltage ×18; enables 5V, 12V, 24V, or 36V outputs using standard resistive dividers. |
| Quiescent Current (Burst Mode) | 6µA typical - sustains ultra-low-power operation in always-on sensor nodes or battery backup circuits for months. |
| Switching Frequency Range | 300kHz to 3MHz - adjustable with single RT resistor; higher frequencies allow smaller inductors (e.g., 10µH at 2.2MHz). |
| PassThru™ Mode | 100% duty cycle when VIN ≥ VOUT - eliminates switching losses and reduces heat in boost preregulator stages feeding downstream regulators. |
| Peak Switch Current Limit | 1.2A (bottom switch), 1.6A (top switch) - defines maximum deliverable load current and inductor sizing boundary under heavy load or short-circuit conditions. |
| Operating Junction Temp | –40°C to +150°C - J-grade qualification ensures reliable operation in under-hood automotive, industrial motor drives, and high-ambient embedded systems. |
Pinout & Package
LT8338JMSE#PBF is housed in a thermally enhanced 10-lead MSOP package (MSE) with exposed 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 (Pin 1) | Input supply rail | Bypassed with ≥0.1µF ceramic capacitor; accepts 3.0V–40V; powers internal LDO and gate drivers. |
| BST (Pin 2) | Bootstrap supply for top switch gate driver | Requires 0.1µF capacitor between BST and SW; enables high-side N-channel MOSFET drive without external charge pump. |
| SW (Pins 3, 4) | Switch node | Connects to inductor and boost capacitor; high dV/dt node requiring compact layout and separation from sensitive analog traces. |
| VOUT (Pin 5) | Regulated output voltage | Bypassed with ≥4.7µF ceramic capacitor; internal 20MΩ feedback divider connects here to sense output. |
| SYNC/MODE (Pin 6) | Mode selection & synchronization input | Configures Burst Mode®, pulse-skipping, SSFM, or external clock sync; logic thresholds: <0.8V (low), >2.0V (high). |
| RT (Pin 7) | Frequency set input | Resistor to GND programs switching frequency (e.g., 40.2kΩ → 2.2MHz); not left floating. |
| EN/UVLO (Pin 8) | Enable and input undervoltage lockout | 1.000V threshold with 50mV hysteresis; used for shutdown or programmable VIN turn-on (e.g., prevent operation below 9V). |
| CTRL (Pin 9) | Reference input for output voltage setting | VOUT = VCTRL × 18; tied to resistive divider from INTVCC (2.6V) to GND; 1% resistors recommended for ±1% VOUT accuracy. |
| INTVCC (Pin 10) | Internal 2.6V LDO output | Bypassed with ≥2.2µF ceramic capacitor; powers internal circuitry; not for external loading. |
| GND (Pin 11) | Power and signal ground | Exposed thermal pad; must be soldered to PCB ground plane for thermal management and low-noise reference. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous boost architecture | Integrated 240mΩ top/bottom MOSFETs eliminate external diode losses, enabling >90% efficiency at medium loads (e.g., 12V→36V @ 100mA). |
| PassThru™ mode | Automatic 100% duty cycle operation when VIN ≥ VOUT - maintains regulated output with zero switching loss, critical for battery-to-bus preregulation. |
| Spread spectrum modulation (SSFM) | ±14% frequency dither at ~10kHz rate - reduces peak EMI by >10dB in conducted and radiated emissions without filter redesign. |
| Internal soft-start | Controlled VC ramp limits inrush current during startup - prevents inductor saturation and output overshoot into capacitive loads (e.g., 1000µF). |
| Frequency foldback near VOUT | Automatically lowers switching frequency as VIN approaches VOUT - avoids minimum on-time limitation and maintains tight regulation (<±2% error) down to VIN = VOUT − 100mV. |
Applications
| Industrial Sensor Node Power | Automotive Camera Module Supply |
|---|---|
|
Use Scenario: Powering 3.3V or 5V image sensors and ISPs from a 12V vehicle battery with strict EMC requirements and cold-cranking tolerance. IC Role / Device Role / Timing Role: Primary DC/DC boost regulator providing isolated, low-noise, spread-spectrum-switched 5V rail with PassThru™ fallback during cranking (VIN dip to 6V). Use Value: Maintains camera operation through 6V–16V input transients; SSFM meets CISPR 25 Class 5 radiated emissions limits without added ferrites. |
Use Scenario: Generating 12V bias for CCD/CMOS image sensors in ADAS cameras where board space is limited and thermal dissipation must be minimized. IC Role / Device Role / Timing Role: Compact, high-efficiency boost converter delivering 12V@300mA from 5V USB-PD or 8V–16V auxiliary rail. Use Value: 10-Lead MSOP footprint saves >40% area vs. discrete solutions; 150°C junction rating supports placement near hot imaging SoCs. |
| Portable Medical Instrument Battery Boost | IoT Edge Node Preregulator |
|
Use Scenario: Extending runtime of handheld diagnostic devices powered by single-cell Li-ion (3.0V–4.2V) while delivering stable 3.3V/5V to microcontrollers and analog front-ends. IC Role / Device Role / Timing Role: Micropower boost regulator operating in Burst Mode® to sustain µA-level sleep currents and deliver mA-level active bursts. Use Value: 6µA quiescent current extends shelf life and standby time; internal compensation eliminates external loop components. |
Use Scenario: Pre-regulating variable solar or energy-harvesting inputs (e.g., 3.6V–24V) to a stable 12V intermediate bus feeding multiple downstream buck converters. IC Role / Device Role / Timing Role: High-voltage boost preregulator with PassThru™ mode ensuring seamless transition from boost to direct conduction as input rises above 12V. Use Value: Eliminates need for OR-ing diodes or ideal diodes; reduces system power loss by >30% compared to fixed-ratio non-PassThru designs. |
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#PBF | Same pinout, 40V/1.2A rating, but lacks PassThru™ mode and spread spectrum; fixed 2.2MHz frequency only. | Not suitable for preregulation or EMI-sensitive applications; lower integration reduces bill-of-materials but increases layout complexity for noise control. | Select LT8338JMSE#PBF when PassThru™, SSFM, or programmable frequency is required; choose LT8337JMSE#PBF only for cost-sensitive, fixed-frequency, non-preregulation use cases. |
| TPS61088RHLR | 4.5V–24V input, 12.6V max output, 10A switch current; no PassThru™; no SSFM; requires external compensation. | Optimized for high-current, low-VOUT applications (e.g., USB PD charging); unsuitable for >24V output or >40V input scenarios. | LT8338JMSE#PBF is preferred for wide-input, high-output, low-IQ, or EMI-critical designs; TPS61088RHLR fits high-current, low-voltage portable power banks. |
Compared with LT8337JMSE#PBF and TPS61088RHLR, the LT8338JMSE#PBF uniquely combines 40V operation, PassThru™, SSFM, and micropower Burst Mode® in a single 10-lead MSOP - enabling simpler, more robust, and EMC-compliant designs where input voltage may exceed output or EMI margins are tight.
Availability
LT8338JMSE#PBF is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive camera modules, portable medical instruments, and IoT edge node preregulators requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8338JMSE#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LT8338JMSE#PBF belongs to Analog Devices' Power by Linear™ family of high-voltage monolithic DC/DC converters, engineered specifically for rugged, space-constrained applications demanding wide VIN, low IQ, and advanced EMI mitigation - such as automotive infotainment, industrial PLCs, and battery-powered instrumentation.
FAQ
What is the maximum output voltage supported by the LT8338JMSE#PBF?
The LT8338JMSE#PBF supports output voltages up to 40V, as defined by its VOUT limit threshold voltage of 41.4V (max) and absolute maximum ratings. This is achieved by programming the CTRL pin voltage - for example, applying 2.0V to CTRL yields VOUT = 2.0V × 18 = 36V. Operation beyond 40V risks exceeding internal overvoltage protection and is not guaranteed.
How does the LT8338JMSE#PBF achieve 6µA quiescent current?
The LT8338JMSE#PBF achieves 6µA typical quiescent current in Burst Mode® by dynamically disabling most internal circuitry between switching bursts - including gate drivers, error amplifier, and oscillator - while maintaining regulation via periodic single-pulse energy delivery to the output capacitor. This behavior is confirmed in the Electrical Characteristics table (Rev. B, p.3) and Typical Performance curves (G09).
Is the LT8338JMSE#PBF pin-compatible with other LT833x series parts?
The LT8338JMSE#PBF shares the same 10-lead MSOP package and pinout with LT8337JMSE#PBF and LT8339JMSE#PBF, making them mechanically interchangeable. However, functional differences exist: LT8337 lacks PassThru™ and SSFM; LT8339 adds I²C interface and telemetry. Direct substitution requires verification of mode pin configuration and feature dependencies in the target design.
What thermal derating applies to the LT8338JMSE#PBF at 150°C junction temperature?
The LT8338JMSE#PBF is specified for full performance over –40°C to +150°C junction temperature (J-grade). At 150°C, lifetime reliability is reduced per Analog Devices' quality guidelines; continuous operation above 125°C requires thermal design validation (e.g., PCB copper area, airflow) and may necessitate derating output current or switching frequency to maintain safe operating area - as detailed in Note 3 (Rev. B, p.4).
Can the LT8338JMSE#PBF synchronize to an external clock while in Burst Mode®?
No - the LT8338JMSE#PBF cannot synchronize to an external clock while in Burst Mode®. External clock synchronization (SYNC function) requires the SYNC/MODE pin to be driven by a valid clock signal (>2V high, <0.8V low, ≥30ns pulse width), which inherently forces pulse-skipping mode operation per the Pin Functions section (Rev. B, p.7). Burst Mode® is only available when SYNC/MODE is tied to GND or biased via resistor.
LT8338JMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT8338JMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8338JMSE#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 LT8338JMSE#PBF reliable?
The price and inventory of LT8338JMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8338JMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8338JMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8338JMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8338JMSE#PBF?
LT8338JMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8338JMSE#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 LT8338JMSE#PBF?
For technical support, including LT8338JMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8338JMSE#PBF requirements.
6.How does Aetrix verify that LT8338JMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8338JMSE#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 LT8338JMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8338JMSE#PBF?
All LT8338JMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8338JMSE#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 LT8338JMSE#PBF part is unused and in its original packaging.
Return procedure for LT8338JMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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