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Analog Devices Inc. LT8357JMSE#TRPBF
- Part No.:
- LT8357JMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8357JMSE#TRPBF.pdf
- Description:
- LOW-IQ 2MHZ 60V ISOLATED SEPIC F
- Quantity:
- Payment:
- Shipping:
Inventory:2,517
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Product details
Overview
LT8357JMSE#TRPBF from Analog Devices is a wide-input, current-mode DC/DC controller supporting boost, SEPIC, and flyback topologies. It features 3V–60V input range, 8µA Burst Mode® quiescent current, 5V split-gate drive for MOSFET control, ±1.5% internal 1V reference, and AEC-Q100 qualification for automotive use in battery monitoring and powertrain systems.
For engineers reviewing the LT8357JMSE#TRPBF datasheet, LT8357JMSE#TRPBF pinout, LT8357JMSE#TRPBF application, or LT8357JMSE#TRPBF equivalent, key selection considerations include its 100kHz–2MHz adjustable switching frequency, thermal grade (–40°C to 150°C), spread-spectrum EMI reduction, programmable soft-start via SS pin, and output short-circuit protection in SEPIC/flyback configurations.
Technical Context
The LT8357JMSE#TRPBF implements fixed-frequency current-mode control with slope compensation, enabling precise peak-current regulation across input and load transients. Its dual-gate driver (GATEP/GATEN) delivers independent 5V pull-up (2.2Ω) and pull-down (0.9Ω) paths to optimize MOSFET switching efficiency and EMI performance.
It supports five SYNC/MODE configurations: external clock sync, spread-spectrum modulation (19% triangle), internal oscillator with pulse-skipping, or low-ripple Burst Mode-each selectable via resistor or voltage level on the SYNC/MODE pin. Frequency foldback activates below 75% FB voltage to prevent inductor current runaway during startup or short-circuit faults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports direct connection to automotive batteries (12V/24V/48V) and industrial rails without pre-regulation. |
| Quiescent Current (Burst Mode) | 8µA typical - enables multi-year battery life in always-on monitoring applications like powertrain sensors. |
| Switching Frequency Range | 100kHz to 2MHz - adjustable via RT resistor; allows trade-off between efficiency (low fSW) and solution size (high fSW). |
| Internal Reference Accuracy | ±1.5% at 1V - ensures stable output regulation across temperature and line/load variations. |
| Operating Junction Temp | –40°C to 150°C - qualified per AEC-Q100 Grade 1, suitable for under-hood automotive environments. |
| Gate Drive Architecture | 5V split gate (GATEP/GATEN) - enables independent optimization of turn-on slew rate (EMI) and turn-off speed (efficiency). |
| Protection Features | Output short-circuit protection (SEPIC/flyback), PGOOD open-drain flag, thermal shutdown, and frequency foldback - reduces need for external fault-handling circuitry. |
Pinout & Package
LT8357JMSE#TRPBF is housed in a thermally enhanced 12-lead MSOP package with exposed pad (Pin 13 = GND), requiring PCB soldering of the pad for thermal performance (θJC = 10°C/W). The package supports high-power density designs in space-constrained automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC | Error amplifier compensation node | Connects external RC network to stabilize control loop; determines transient response and phase margin. |
| FB | Feedback input | Regulated to 1.000V ±1.5%; sets output voltage via resistor divider; enables tracking and soft-start ramping. |
| PGOOD | Open-drain power-good flag | Pulled low when FB deviates >±8% from target; requires external pull-up for system sequencing or fault indication. |
| SS | Soft-start timer | Charged by 15µA internal current; controls output ramp rate; hard-pulled to GND during fault or UVLO. |
| RT | Oscillator frequency setting | Resistor-to-GND sets fSW from 100kHz–2MHz; enables precise EMI band placement and layout optimization. |
| SYNC/MODE | Mode selection & sync input | Five configurations: external clock sync, spread-spectrum, pulse-skipping, or Burst Mode - selected by voltage/resistor. |
| SENSE | Current sense comparator input | Kelvin-connected to sense resistor; threshold = 60mV typ; enables accurate peak-current limiting and OCP. |
| GATEP / GATEN | N-channel MOSFET gate drivers | Split 5V outputs with 2.2Ω pull-up / 0.9Ω pull-down - decouples turn-on EMI tuning from turn-off efficiency. |
| INTVCC | Internal 5V LDO output | Supplies internal logic and gate drivers; requires ≥2.2µF ceramic bypass; max 60mA load. |
| EN/UVLO | Enable & undervoltage lockout | Accurate 1.220V rising threshold with 42mV hysteresis; enables programmable VIN UVLO using resistor divider. |
| VIN | Main input supply | 3V–60V input; powers INTVCC LDO; requires 0.1µF local ceramic bypass. |
| GND (Pin 13) | Power and signal ground | Exposed thermal pad must be soldered to PCB ground plane for thermal reliability and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| 5V split-gate drive | Enables independent gate resistor selection: large Rpull-up for EMI suppression, low Rpull-down for fast turn-off and reduced shoot-through risk. |
| Spread-spectrum modulation | 19% triangle dither over base frequency - reduces peak conducted EMI by >10dB without altering filter design or layout. |
| Burst Mode® operation | 8µA quiescent current at light load - maintains regulation while minimizing battery drain in intermittent-sensing applications. |
| Programmable soft-start | Linear ramp via SS capacitor - prevents inrush current and output overshoot during power-up or recovery from fault. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +150°C operation - meets automotive reliability requirements for powertrain and body electronics. |
| Frequency foldback | Automatically reduces fSW when FB <75% of target - prevents inductor saturation and current runaway during startup or output short. |
Applications
| Automotive Powertrain Battery Monitoring | Industrial 24V Rail Boost Converter |
|---|---|
Use Scenario: Real-time voltage/current sensing of 12V/48V hybrid battery packs in engine control units. IC Role / Device Role / Timing Role: Boost controller generating isolated 5V/3.3V rails for ADCs, CAN transceivers, and microcontrollers from variable battery input. Use Value: 8µA Burst Mode® extends sensor node battery life; AEC-Q100 qualification ensures reliability in under-hood thermal cycling. |
Use Scenario: Up-converting 24V industrial bus to 48V for PoE++ switches or servo motor drives. IC Role / Device Role / Timing Role: High-efficiency 2MHz boost controller driving discrete N-MOSFETs with minimal external components. Use Value: 2MHz operation enables <2.2µH inductors and compact 1210 MLCCs; split-gate drive reduces EMI filtering cost. |
| Portable Medical Diagnostic Equipment | Rail-to-Rail Industrial Sensor Interface |
Use Scenario: Battery-powered ultrasound or ECG devices requiring stable analog supply rails from single-cell Li-ion. IC Role / Device Role / Timing Role: SEPIC controller delivering regulated 5V/±15V outputs with no polarity inversion during deep discharge (3V input). Use Value: 3V–60V input range accommodates full Li-ion discharge curve; ±1.5% reference ensures ADC accuracy across temperature. |
Use Scenario: Signal conditioning front-end in PLC I/O modules interfacing 4–20mA transmitters and RTD sensors. IC Role / Device Role / Timing Role: Flyback controller powering isolated analog and digital domains from unregulated 24V field supply. Use Value: Output short-circuit protection prevents latch-up during field wiring faults; PGOOD flag enables safe system reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EFE#PBF | 4-switch synchronous buck-boost controller; no integrated gate drivers; requires external MOSFETs and bootstrap circuitry. | Supports bidirectional power flow and higher efficiency (>95%) but larger BOM and layout complexity. | Select for high-efficiency, high-current (>5A) buck-boost where footprint and component count are secondary to efficiency. |
| LM5122MMX/NOPB | Wide-input (3–65V) boost/SEPIC controller; single gate driver (no split drive); no spread-spectrum or Burst Mode®. | Lacks EMI optimization features and ultra-low-IQ; rated only to 125°C junction temperature. | Select for cost-sensitive industrial applications where AEC-Q100 and sub-10µA IQ are not required. |
Compared with LTC3789EFE#PBF and LM5122MMX/NOPB, the LT8357JMSE#TRPBF offers unique integration of split-gate drive, spread-spectrum EMI reduction, and 8µA Burst Mode®-making it optimal for space-constrained, automotive-grade, low-noise boost/SEPIC/flyback designs where thermal robustness and battery longevity are critical.
Availability
LT8357JMSE#TRPBF is available at Aetrix Electronics and suitable for automotive powertrain monitoring, industrial 24V rail boosting, and portable medical equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8357JMSE#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, automotive, and communications markets.
The LT8357JMSE#TRPBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for rugged, high-efficiency DC/DC conversion in automotive and industrial environments demanding wide input range, low quiescent current, and AEC-Q100 compliance.
FAQ
What is the maximum operating junction temperature for LT8357JMSE#TRPBF?
The LT8357JMSE#TRPBF is rated for –40°C to +150°C junction temperature and is AEC-Q100 qualified for automotive Grade 1 applications. This rating is validated through thermal characterization and process correlation; continuous operation above 125°C derates lifetime, and overtemperature protection activates above 150°C to prevent damage. The exposed pad (Pin 13) must be soldered to PCB ground for thermal reliability.
Does LT8357JMSE#TRPBF support synchronous rectification?
No, the LT8357JMSE#TRPBF does not support synchronous rectification. It is a controller IC that drives external N-channel MOSFETs via its GATEP and GATEN pins but does not integrate synchronous rectifier drivers or timing logic for synchronous FET control. For synchronous flyback or boost, external timing or a dedicated sync controller is required.
How is spread-spectrum modulation enabled on LT8357JMSE#TRPBF?
Spread-spectrum modulation on the LT8357JMSE#TRPBF is enabled by connecting the SYNC/MODE pin to the INTVCC pin (5V) or to ground via a 100kΩ resistor. In either configuration, the internal oscillator frequency is modulated with a 19% triangular dither, reducing peak EMI emissions without affecting regulation or efficiency. External clock synchronization disables this feature.
Can LT8357JMSE#TRPBF operate in discontinuous conduction mode (DCM)?
Yes, the LT8357JMSE#TRPBF supports DCM operation, particularly in Burst Mode® at light loads. During DCM, the controller delivers discrete current pulses to the output capacitor followed by extended sleep periods, achieving 8µA quiescent current. The device automatically transitions between CCM and DCM based on load, input voltage, and inductor value - no external mode selection is needed.
What is the purpose of the SENSE pin on LT8357JMSE#TRPBF?
The SENSE pin on LT8357JMSE#TRPBF is the Kelvin-connected input to the current-sense comparator, used to monitor the voltage drop across an external sense resistor in the source path of the bottom MOSFET. It triggers overcurrent protection at 105mV (typical) and sets peak current limit at 60mV (typical), ensuring accurate cycle-by-cycle current limiting in boost, SEPIC, and flyback configurations.
LT8357JMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 60V
- Frequency - Switching:
- 100kHz ~ 2MHz
- Duty Cycle (Max):
- 95%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LT8357JMSE#TRPBF FAQ
1.How can I place an order for LT8357JMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8357JMSE#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 LT8357JMSE#TRPBF reliable?
The price and inventory of LT8357JMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8357JMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8357JMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8357JMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8357JMSE#TRPBF?
LT8357JMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8357JMSE#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 LT8357JMSE#TRPBF?
For technical support, including LT8357JMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8357JMSE#TRPBF requirements.
6.How does Aetrix verify that LT8357JMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8357JMSE#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 LT8357JMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8357JMSE#TRPBF?
All LT8357JMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8357JMSE#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 LT8357JMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8357JMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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