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Analog Devices Inc. LT8338EMSE#TRPBF
- Part No.:
- LT8338EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8338EMSE#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 1.2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,366
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Product details
Overview
LT8338EMSE#TRPBF from Analog Devices is a monolithic synchronous boost converter IC designed for high-efficiency step-up regulation in space-constrained, low-power systems. It delivers up to 36V output from 3.0V–40V input, features 6µA Burst Mode quiescent current, 240mΩ integrated power switches, and supports PassThru™ mode when VIN ≥ VOUT - enabling use in battery-powered industrial sensors and portable medical monitors.
For engineers reviewing the LT8338EMSE#TRPBF datasheet, LT8338EMSE#TRPBF pinout, LT8338EMSE#TRPBF application, or LT8338EMSE#TRPBF equivalent, key selection criteria include its 300kHz–3MHz adjustable switching frequency, spread-spectrum EMI reduction, accurate 1V EN/UVLO threshold, and 10-lead MSOP package with exposed thermal pad.
Technical Context
The LT8338EMSE#TRPBF employs fixed-frequency current-mode control with internal slope compensation and programmable soft-start. Its dual MOSFET architecture integrates a 240mΩ bottom switch (MBOT) and top switch (MTOP), both rated for 40V operation and 1.2A/1.6A current limits respectively.
It implements dynamic switching frequency foldback near VIN ≈ VOUT to maintain regulation under ultra-low duty cycle conditions, and uses an internal 2.6V LDO (INTVCC) to power gate drivers and bias circuitry - bypassed by a minimum 2.2µF ceramic capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 40V - supports wide-range unregulated sources including multi-cell Li-ion, automotive, and industrial rails. |
| Quiescent Current (Burst Mode) | 6µA typical - enables >1-year battery life in always-on IoT sensor nodes drawing <100µA average load current. |
| Switching Frequency Range | 300kHz to 3MHz via RT resistor - balances efficiency (lower fSW) vs. size (higher fSW) without external clock dependency. |
| Output Voltage Accuracy | ±2% over temperature - ensured by 18× internal feedback divider and 1V reference tolerance on EN/UVLO pin. |
| PassThru™ Mode Threshold | Activates at VIN ≥ VOUT - eliminates switching losses and reduces output ripple when input exceeds regulated output voltage. |
| Integrated Power Switches | Monolithic 40V, 240mΩ NMOS pair - eliminates external FETs and gate drivers, reducing BOM count and layout complexity. |
| Spread Spectrum Modulation | +14% frequency deviation at ~10kHz rate - lowers peak EMI emissions by spreading energy across spectrum, easing EMC certification. |
Pinout & Package
LT8338EMSE#TRPBF is housed in a thermally enhanced 10-lead MSOP package (MSE) with exposed GND pad (Pin 11) requiring PCB soldering for optimal thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply connection | Bypassed with ≥0.1µF ceramic capacitor; supports 3.0V–40V input with internal UVLO protection. |
| BST (Pin 2) | Top switch gate driver bootstrap supply | Requires 0.1µF capacitor between BST and SW to sustain MTOP gate drive during 100% duty cycle PassThru mode. |
| SW (Pins 3,4) | Switch node | High dV/dt node connecting inductor and boost capacitor; must be minimized in area and isolated from sensitive analog traces. |
| VOUT (Pin 5) | Regulated output voltage | Internally sensed via 20MΩ resistive divider; requires ≥4.7µF low-ESR ceramic output capacitance for stability. |
| SYNC/MODE (Pin 6) | Mode selection & synchronization input | Selects Burst Mode, pulse-skipping, SSFM, or external clock sync - no external pull-up/down required for floating pulse-skipping default. |
| RT (Pin 7) | Frequency set resistor connection | Resistor to GND programs fSW from 300kHz–3MHz; open-circuit not allowed. |
| EN/UVLO (Pin 8) | Enable and input undervoltage lockout | 1.0V threshold with 50mV hysteresis; ties to VIN for always-on operation or resistor divider for programmable VIN turn-on. |
| CTRL (Pin 9) | Error amplifier reference input | Sets VOUT = VCTRL × 18; driven by resistive divider from INTVCC (2.6V) to achieve precise output voltage without external feedback network. |
| INTVCC (Pin 10) | Internal 2.6V LDO output | Powers internal circuitry; requires ≥2.2µF ceramic bypass to GND; not intended for external loading. |
| GND (Pin 11) | Power and signal ground | Exposed thermal pad - must be soldered to PCB ground plane for thermal management and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 6µA in Burst Mode enables micropower operation for battery-backed real-time clocks and wireless transceivers. |
| 100% duty cycle PassThru™ mode | Eliminates switching loss and ripple when VIN ≥ VOUT - ideal for preregulation stages in multi-rail power systems. |
| Programmable spread-spectrum modulation | Reduces EMI peak amplitude by >10dB without adding filtering components - simplifies compliance testing for Class B emissions. |
| Internal soft-start and frequency foldback | Prevents inrush current damage and maintains regulation during VIN-to-VOUT crossover - critical for hot-plug and variable-input applications. |
| Monolithic 40V, 240mΩ power switches | Enables compact 2-layer PCB designs with no external MOSFETs or drivers - reduces solution footprint by >30% vs. controller-based alternatives. |
Applications
| Industrial Sensor Nodes | Portable Medical Monitors |
|---|---|
|
Use Scenario: Battery-powered gas sensor module operating from 2×Li-ion (6–8.4V) delivering regulated 36V to photomultiplier tube (PMT). IC Role / Device Role / Timing Role: Primary DC/DC boost regulator providing stable high-voltage bias with minimal standby drain. Use Value: 6µA quiescent current extends 2000mAh battery life to >18 months in sleep mode; PassThru mode prevents inefficiency when battery voltage rises above 36V during charging. |
Use Scenario: Handheld ECG device using single 3.7V Li-ion cell to generate ±12V analog front-end rails and 3.3V digital logic supply. IC Role / Device Role / Timing Role: High-efficiency boost stage feeding isolated flyback or charge-pump negative rail generator. Use Value: 240mΩ integrated switches eliminate discrete FET layout sensitivity; spread-spectrum operation meets IEC 60601-1 EMI requirements without added ferrites. |
| Automotive Telematics Units | Smart Building Controllers |
|
Use Scenario: LTE modem module powered from 9–16V vehicle bus, requiring clean 3.3V/5V supplies with cold-crank immunity down to 3.0V. IC Role / Device Role / Timing Role: Pre-regulator stepping up brownout-prone input to stable intermediate rail before LDO post-regulation. Use Value: Wide 3.0V–40V input range tolerates start-stop and load-dump transients; 1V EN/UVLO allows precise VIN turn-on threshold programming to avoid unstable operation below 6V. |
Use Scenario: Wireless HVAC controller powered by 12V PoE or backup battery, needing 36V for RS-485 transceivers and 5V for microcontroller. IC Role / Device Role / Timing Role: Primary boost converter supporting dual-output configuration via secondary LDO or buck converter. Use Value: Adjustable 300kHz–3MHz fSW permits optimization for low-noise (1MHz) or high-efficiency (300kHz) operation; internal compensation eliminates loop tuning effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8337EMSE#TRPBF | Lower 2.5A switch current limit, 3.5V–40V input, no PassThru mode, same pinout | Lacks 100% duty cycle operation - unsuitable for VIN ≥ VOUT preregulation | Select when higher peak current (2.5A) is needed but PassThru functionality is unnecessary. |
| TPS61088RHLR | 6.5V max VOUT, 2.7V–12V input, 12A switch, no spread spectrum or PassThru | Optimized for low-VIN, high-current consumer apps - incompatible with 36V output or 40V input | Choose only for sub-12V input, ≤6.5V output, high-current (<10A) applications where EMI reduction is secondary. |
Compared with LT8338EMSE#TRPBF, LT8337EMSE#TRPBF offers higher current capability but forfeits PassThru mode and lower quiescent current, while TPS61088RHLR targets entirely different voltage/current ranges and lacks critical industrial features like wide VIN, spread spectrum, and VIN-to-VOUT crossover handling.
Availability
LT8338EMSE#TRPBF is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, automotive telematics units, and smart building controllers requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LT8338EMSE#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 communications markets since 1965.
The LT8338EMSE#TRPBF belongs to Analog Devices' Power by Linear™ family of micropower DC/DC converters, engineered specifically for ultra-low-IQ, wide-input, high-voltage boost applications in battery-constrained and EMI-sensitive environments.
FAQ
What is the maximum output voltage supported by the LT8338EMSE#TRPBF?
The LT8338EMSE#TRPBF supports output voltages up to 40V, with a typical regulated output of 36V in standard applications. Its internal VOUT limit threshold is specified at 40.2V to 41.4V, ensuring safe operation even under transient overvoltage conditions. The actual output is set via the CTRL pin using the formula VOUT = VCTRL × 18, allowing precise programmability across the full 3.0V–40V range.
Does the LT8338EMSE#TRPBF require external compensation components?
No, the LT8338EMSE#TRPBF features internal compensation, eliminating the need for external Type II or Type III compensation networks. This simplifies design, reduces component count, and ensures stable operation across its full input/output range and load conditions without loop tuning - a key advantage over controller-based boost ICs that mandate external compensation.
How does the PassThru™ mode function in the LT8338EMSE#TRPBF?
In PassThru™ mode, the LT8338EMSE#TRPBF disables switching and maintains continuous conduction by keeping the top switch (MTOP) fully on and the bottom switch (MBOT) fully off when VIN rises to or above the programmed VOUT. This provides direct conduction path from input to output with minimal voltage drop, eliminating switching losses and ripple - critical for efficiency in preregulation and battery-charging scenarios.
Can the LT8338EMSE#TRPBF synchronize to an external clock?
Yes, the LT8338EMSE#TRPBF can synchronize its switching frequency to an external clock applied to the SYNC/MODE pin. When driven by a square, triangle, or sinusoidal waveform with valleys <0.8V and peaks >2.0V, it locks to the external frequency and operates in pulse-skipping mode. The RT resistor should be selected to match or slightly undershoot the sync frequency to ensure proper slope compensation.
What thermal considerations apply to the LT8338EMSE#TRPBF's exposed pad?
Pin 11 of the LT8338EMSE#TRPBF is an exposed GND pad essential for thermal dissipation. It must be soldered to a PCB copper pour connected to system ground, with ≥4 thermal vias (0.3mm diameter) to inner/ground layers. Failure to properly attach this pad results in junction temperature rise exceeding θJA = 40°C/W rating, potentially triggering thermal shutdown or degrading long-term reliability in continuous 1.2A operation.
LT8338EMSE#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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT8338EMSE#TRPBF FAQ
1.How can I place an order for LT8338EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8338EMSE#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 LT8338EMSE#TRPBF reliable?
The price and inventory of LT8338EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8338EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8338EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8338EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8338EMSE#TRPBF?
LT8338EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8338EMSE#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 LT8338EMSE#TRPBF?
For technical support, including LT8338EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8338EMSE#TRPBF requirements.
6.How does Aetrix verify that LT8338EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8338EMSE#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 LT8338EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8338EMSE#TRPBF?
All LT8338EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8338EMSE#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 LT8338EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8338EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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