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Analog Devices Inc. LT8338EMSE#PBF
- Part No.:
- LT8338EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8338EMSE#PBF.pdf
- Description:
- IC REG BOOST ADJ 1.2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:109
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Product details
Overview
LT8338EMSE#PBF from Analog Devices is a monolithic synchronous boost converter IC with 40V input/output capability, 1.2A bottom switch current limit, and 6µA quiescent current in Burst Mode operation. It integrates 240mΩ power switches, supports PassThru™ mode for VIN ≥ VOUT, and delivers up to 36V output in typical applications such as battery-powered industrial sensors and low-power IoT node power supplies.
For engineers reviewing the LT8338EMSE#PBF datasheet, LT8338EMSE#PBF pinout, LT8338EMSE#PBF application, or LT8338EMSE#PBF equivalent, key selection considerations include its adjustable 300kHz–3MHz switching frequency, spread-spectrum EMI reduction, 100% duty cycle PassThru operation, and precise 1V EN/UVLO threshold with 50mV hysteresis.
Technical Context
The LT8338EMSE#PBF employs fixed-frequency current-mode control with internal slope compensation and programmable soft-start. Its dual MOSFET architecture includes a 240mΩ bottom switch (1.2A limit) and top switch (1.6A limit in PassThru), both rated for 40V operation.
It features three distinct light-load operating modes selected via SYNC/MODE pin: Burst Mode (6µA IQ, <20mVP-P ripple), pulse-skipping (1.2mA IQ), and synchronized pulse-skipping with external clock input (0.3–3MHz range). Frequency foldback activates when VIN approaches VOUT to maintain regulation at ultra-low duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 40V - supports wide-range battery and industrial bus inputs without pre-regulation |
| Quiescent Current (Burst Mode) | 6µA typ - enables multi-year battery life in always-on sensor nodes |
| Output Voltage Range | Up to 40V - programmable via CTRL pin with 18× internal divider ratio |
| Switching Frequency Range | 300kHz to 3MHz - set by RT resistor; enables optimization of efficiency vs. size trade-off |
| PassThru Mode Threshold | VIN ≥ VOUT - eliminates switching losses when input exceeds regulated output |
| EN/UVLO Threshold | 1.000V ±25mV - accurate undervoltage lockout for reliable startup and brownout protection |
| Bottom Switch RDS(on) | 240mΩ max - reduces conduction loss in high-current boost paths |
Pinout & Package
LT8338EMSE#PBF is housed in a 10-lead MSOP package with exposed pad (Pin 11 = GND), θJA = 40°C/W. The exposed pad must be soldered to PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply connection | Bypassed with ≥0.1µF ceramic capacitor; supports 3–40V input with internal LDO powering INTVCC |
| BST (Pin 2) | Top switch gate driver supply | Requires 0.1µF capacitor to SW; enables high-side MOSFET drive above VIN |
| SW (Pins 3,4) | Switch node | High dV/dt node connecting inductor and BST capacitor; requires compact layout to minimize EMI |
| VOUT (Pin 5) | Regulated output voltage | Internally sensed via 20MΩ resistive divider; bypassed with ≥4.7µF ceramic capacitor |
| SYNC/MODE (Pin 6) | Mode selection & synchronization input | Configures Burst/Pulse-Skipping/SSFM/SYNC modes; accepts external clock 0.3–3MHz |
| RT (Pin 7) | Frequency set resistor connection | Resistor to GND programs switching frequency (300kHz–3MHz); not left floating |
| EN/UVLO (Pin 8) | Enable and input UVLO control | 1V threshold enables shutdown or programmable VIN turn-on; draws 0.2µA in shutdown |
| CTRL (Pin 9) | Reference voltage input | Sets VOUT = VCTRL × 18; typically driven by resistor divider from INTVCC (2.6V) |
| INTVCC (Pin 10) | Internal 2.6V LDO output | Powers internal circuitry; bypassed with ≥2.2µF ceramic capacitor; no external load permitted |
| GND (Pin 11) | Power and signal ground | Exposed pad; must be soldered to PCB ground plane for thermal management and noise control |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle PassThru™ Mode | Eliminates switching losses when VIN ≥ VOUT, enabling efficient preregulation in multi-stage converters |
| Spread Spectrum Modulation (SSFM) | Reduces peak EMI emissions by ±14% frequency dithering at ~10kHz modulation rate |
| Programmable Light-Load Operation | Five SYNC/MODE configurations support Burst Mode (6µA IQ), pulse-skipping, or synchronized operation |
| Internal Compensation & Soft-Start | Reduces external component count; limits inrush current during startup and fault recovery |
| Frequency Foldback at Low Duty Cycle | Maintains regulation when VIN approaches VOUT by automatically lowering fSW to avoid minimum on-time violation |
Applications
| Industrial Sensor Power Supply | Portable Medical Device Boost |
|---|---|
Use Scenario: Powering 3.3V or 5V microcontrollers and analog front-ends from single Li-ion (3.0–4.2V) or two alkaline cells (1.8–3.2V). IC Role / Device Role / Timing Role: Primary DC/DC boost regulator providing stable output with ultralow quiescent current during sleep cycles. Use Value: 6µA Burst Mode IQ extends battery life beyond 5 years in intermittent-sampling applications. |
Use Scenario: Generating 12V or 24V bias for ultrasound transducers or precision ADCs in handheld diagnostic tools. IC Role / Device Role / Timing Role: High-efficiency synchronous boost stage delivering up to 36V with minimal thermal rise in space-constrained enclosures. Use Value: Monolithic 40V/1.2A switches eliminate external FETs; PassThru mode prevents reverse current when input exceeds output. |
| Automotive Body Control Module (BCM) | Smart Meter Auxiliary Power |
Use Scenario: Providing regulated 5V or 12V from 9–16V automotive battery to MCU and CAN transceivers during cold-crank (down to 3V). IC Role / Device Role / Timing Role: Input-robust boost converter with EN/UVLO programmability and wide VIN range. Use Value: 3.0–40V input range accommodates cold-crank dips and load-dump transients without external protection. |
Use Scenario: Deriving isolated auxiliary power from 220VAC line via capacitive dropper, requiring high-voltage tolerant DC/DC stage. IC Role / Device Role / Timing Role: High-input-voltage boost regulator accepting up to 40V from rectified dropper network. Use Value: 40V absolute maximum rating allows direct interface with unregulated high-impedance sources without pre-regulator. |
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#PBF | Lower 2.5A switch current limit, 3.3V–40V input, same 10-MSOP package and pinout | Higher output current capability but higher 12µA Burst Mode IQ | Select when >1.2A load current required; verify thermal margin with 2.5A switch |
| TPS61088RHLR | 6.5V max VOUT, 3.5A switch, 2.7–12V input, 16-pin QFN package | Limited to ≤12V input and ≤6.5V output; no PassThru or SSFM | Choose for cost-sensitive, lower-voltage applications where 40V capability and EMI reduction are unnecessary |
Compared with LT8338EMSE#PBF, LT8337EMSE#PBF offers higher current but sacrifices ultralow IQ, while TPS61088RHLR provides higher peak current in a different package but lacks critical features like PassThru mode, SSFM, and 40V operation-making LT8338EMSE#PBF uniquely suited for high-input-voltage, low-quiescent-current, EMI-sensitive designs.
Availability
LT8338EMSE#PBF is available at Aetrix Electronics and suitable for industrial sensor power supplies, portable medical devices, automotive body control modules, and smart meter auxiliary power requiring stable component supply across extended temperature ranges.
Supply support for LT8338EMSE#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 LT8338EMSE#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC converters, designed specifically for space-constrained, battery-sensitive, and EMI-critical applications demanding wide input range and ultralow quiescent current.
FAQ
What is the maximum output voltage supported by the LT8338EMSE#PBF?
The LT8338EMSE#PBF supports output voltages up to 40V, as confirmed by its absolute maximum VOUT rating and internal VOUT limit threshold of 41.4V. In typical applications, it delivers regulated outputs such as 36V (as shown in the datasheet's electrical characteristics table), with VOUT programmable via the CTRL pin using the 18× internal divider ratio. Operation beyond 40V risks permanent damage.
How does the LT8338EMSE#PBF achieve 6µA quiescent current?
The LT8338EMSE#PBF achieves 6µA typical quiescent current in Burst Mode operation by shutting down all non-essential circuitry-including gate drivers and error amplifier-between energy bursts. During each burst, it delivers a single current pulse to the output capacitor, then enters deep sleep until the output voltage droop triggers the next burst. This behavior is validated in the Electrical Characteristics table under "VIN Quiescent Current (Burst Mode Operation)".
Can the LT8338EMSE#PBF operate with input voltage higher than output voltage?
Yes-the LT8338EMSE#PBF enters 100% duty cycle PassThru™ mode when VIN rises above the regulated VOUT, turning on the top switch continuously and disabling the bottom switch. This is explicitly documented in the Features list and Applications Information section. In PassThru mode, VOUT tracks VIN with minimal drop, and the device draws 12–35µA quiescent current depending on load conditions.
What is the purpose of the SYNC/MODE pin on the LT8338EMSE#PBF?
The SYNC/MODE pin on the LT8338EMSE#PBF serves dual functions: it selects among five operating modes (Burst, Burst+SSFM, Pulse-Skipping, Pulse-Skipping+SSFM, or External Clock Sync) and accepts an external clock signal up to 3MHz. Its voltage level or external connection determines behavior-e.g., tying to GND enables Burst Mode, while applying a 2.0V–6V square wave synchronizes switching. This is detailed in the PIN FUNCTIONS and OPERATION sections.
Is the LT8338EMSE#PBF RoHS-compliant and lead-free?
Yes-the LT8338EMSE#PBF carries the #PBF suffix, indicating lead-free finish per RoHS Directive 2011/65/EU. This is confirmed in the ORDER INFORMATION table on page 2 of the datasheet, which lists "LEAD FREE FINISH" for LT8338EMSE#PBF and specifies tape-and-reel packaging with Pb-free termination.
LT8338EMSE#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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT8338EMSE#PBF FAQ
1.How can I place an order for LT8338EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8338EMSE#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 LT8338EMSE#PBF reliable?
The price and inventory of LT8338EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8338EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8338EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8338EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8338EMSE#PBF?
LT8338EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8338EMSE#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 LT8338EMSE#PBF?
For technical support, including LT8338EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8338EMSE#PBF requirements.
6.How does Aetrix verify that LT8338EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8338EMSE#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 LT8338EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8338EMSE#PBF?
All LT8338EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8338EMSE#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 LT8338EMSE#PBF part is unused and in its original packaging.
Return procedure for LT8338EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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