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Analog Devices Inc. LT8357JMSE#PBF
- Part No.:
- LT8357JMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8357JMSE#PBF.pdf
- Description:
- LOW-IQ 2MHZ 60V ISOLATED SEPIC F
- Quantity:
- Payment:
- Shipping:
Inventory:252
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Product details
Overview
LT8357JMSE#PBF from Analog Devices is a wide-input, current-mode DC/DC controller supporting boost, SEPIC, and flyback topologies with 3V–60V input range, 2MHz max switching frequency, 8µA Burst Mode® quiescent current, ±1.5% internal 1V reference, and 5V split-gate drive for EMI-optimized N-channel MOSFET control - deployed in automotive powertrain battery monitoring and industrial 24V/2A boost systems.
For engineers reviewing the LT8357JMSE#PBF datasheet, LT8357JMSE#PBF pinout, LT8357JMSE#PBF application, or LT8357JMSE#PBF equivalent, key selection considerations include AEC-Q100 qualification, thermal rating up to 150°C junction, spread-spectrum EMI reduction, programmable soft-start via SS pin, and precise UVLO threshold with hysteresis on EN/UVLO.
Technical Context
The LT8357JMSE#PBF implements fixed-frequency current-mode control with adjustable 100kHz–2MHz operation via RT resistor or external clock synchronization on SYNC/MODE, plus triangle spread-spectrum modulation (19% deviation) when SYNC/MODE is tied to INTVCC or grounded via 100kΩ. Its dual-gate driver delivers independent 2.2Ω pull-up and 0.9Ω pull-down paths to optimize MOSFET switching efficiency and EMI simultaneously.
Light-load behavior is configurable: pulse-skipping mode enables fast transient response, while low-ripple Burst Mode reduces VIN quiescent current to 8µA typical by delivering discrete current pulses followed by deep sleep periods. Fault protection includes output overvoltage detection (±8% FB threshold), short-circuit protection in SEPIC/flyback, and automatic recovery after SENSE overcurrent latch reset via SS pin discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports direct connection to automotive battery (9V–16V), industrial rails, and wide-range battery-powered systems without pre-regulation. |
| Quiescent Current (Burst Mode) | 8µA typical - enables multi-year battery life in always-on monitoring applications like battery cell voltage sensing. |
| Switching Frequency Range | 100kHz to 2MHz - selectable via RT resistor or external clock; higher frequencies reduce inductor/capacitor size but increase switching losses. |
| Internal Reference Accuracy | ±1.5% at 1V - ensures stable output regulation across temperature and line/load variations in precision 24V or 48V supplies. |
| Junction Temperature Range | –40°C to +150°C - qualified per AEC-Q100 Grade 1, enabling under-hood automotive use without derating. |
| Gate Drive Architecture | 5V split-gate (GATEP/GATEN) - allows independent optimization of turn-on slew rate (via external pull-up R) and turn-off speed (strong pull-down) for EMI/efficiency trade-off. |
| Output Power Good | Open-drain PGOOD with ±8% FB threshold hysteresis - provides reliable system-level power sequencing and fault indication without external comparators. |
Pinout & Package
LT8357JMSE#PBF is housed in a thermally enhanced 12-lead MSOP package with exposed pad (Pin 13) soldered to PCB ground for optimal thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC | Error amplifier compensation node | Connects external RC network to stabilize control loop; directly sets bandwidth and phase margin of feedback path. |
| FB | Output voltage feedback input | Regulated to 1.000V ±1.5%; used with resistor divider to set precise output voltage (e.g., 24V via 23:1 ratio). |
| PGOOD | Open-drain power-good indicator | Pulled low when FB deviates >±8% from target; requires external pull-up for system enable/disable signaling. |
| SS | Soft-start timing capacitor node | Charged by 15µA internal current source; controls output ramp time and prevents inrush current during startup. |
| RT | Oscillator frequency setting | Resistor to GND sets switching frequency from 100kHz (357kΩ) to 2MHz (15.0kΩ); enables EMI tuning and size/efficiency trade-offs. |
| SYNC/MODE | Frequency sync & operating mode select | Five configurations: external clock sync, spread-spectrum, pulse-skipping, or Burst Mode - selected by voltage/resistor tie-off. |
| SENSE | Current sense comparator input | Kelvin-connected to sense resistor; detects peak inductor current for cycle-by-cycle current limiting (60mV typ threshold). |
| GATEP / GATEN | N-MOSFET gate drive outputs | Split 5V drive: GATEP (2.2Ω pull-up) and GATEN (0.9Ω pull-down) allow independent gate resistor optimization. |
| INTVCC | Internal 5V LDO output | Supplies internal logic and gate drivers; must be bypassed with ≥2.2µF ceramic cap; not for external loading. |
| EN/UVLO | Enable and undervoltage lockout input | Accurate 1.220V rising threshold with 42mV hysteresis - enables programmable VIN UVLO using resistor divider. |
| VIN | Main input supply | Accepts 3V–60V; powers INTVCC LDO and high-side switch in boost/SEPIC; local 0.1µF ceramic bypass required. |
| GND (Pin 13) | Power and signal ground | Exposed thermal pad - must be soldered to large PCB ground plane for thermal management and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum frequency modulation | 19% triangular dither around oscillator frequency - reduces peak EMI by >10dB in conducted emissions without filtering overhead. |
| Low-ripple Burst Mode® operation | 8µA typical quiescent current with <10mV SENSE threshold - maintains tight output regulation and <10mVpp ripple at microamp loads. |
| Programmable soft-start and tracking | SS pin controlled by 15µA current source - enables monotonic VOUT ramp and seamless power supply sequencing with other rails. |
| AEC-Q100 Grade 1 qualification | Rated for –40°C to +150°C operation - validated for automotive powertrain, ADAS sensors, and under-hood ECUs without derating. |
| 5V split-gate MOSFET driver | Independent GATEP (2.2Ω) and GATEN (0.9Ω) - permits simultaneous optimization of EMI (slow turn-on) and efficiency (fast turn-off). |
| Frequency foldback protection | Automatic oscillator slowdown below 75% FB voltage - prevents minimum on-time violation during start-up or short-circuit conditions. |
Applications
| Automotive Powertrain Battery Monitoring | Industrial 24V/2A Boost Supply |
|---|---|
Use Scenario: Real-time voltage/current monitoring of 12V/48V battery stacks in EVs and HEVs, requiring continuous operation during engine cranking (4.5V–60V transients). IC Role / Device Role / Timing Role: Controller for isolated flyback converter powering isolated ADCs and CAN transceivers; regulates 5V/3.3V rails from variable battery input. Use Value: 8µA Burst Mode current extends backup battery life; AEC-Q100 qualification ensures reliability across temperature extremes; spread-spectrum reduces CAN bus interference. |
Use Scenario: Compact 24V/2A boost converter for PLC I/O modules and industrial HMIs powered from 12V DC rails. IC Role / Device Role / Timing Role: High-efficiency boost controller driving discrete N-MOSFET; synchronizes to system clock via SYNC/MODE to avoid noise coupling into analog signal chains. Use Value: 2MHz operation enables <2.2µH inductor and 22µF output capacitance; split-gate drive minimizes radiated EMI near sensitive 4–20mA circuits. |
| Portable Test Equipment Power | Smart Sensor Node Power Management |
Use Scenario: Handheld multimeters and oscilloscopes requiring regulated 15V and –5V rails from single-cell Li-ion (2.7V–4.2V). IC Role / Device Role / Timing Role: SEPIC controller generating positive and negative outputs; uses RT resistor to fix 1.2MHz switching for compact magnetics. Use Value: Wide 3V–60V input accommodates depleted battery down to 2.7V with UVLO hysteresis; PGOOD enables auto-shutdown before brownout. |
Use Scenario: Wireless sensor nodes with BLE or LoRa radios, powered by coin-cell or energy harvesting, needing ultra-low standby power. IC Role / Device Role / Timing Role: Low-IQ boost controller charging supercapacitor from 1.8V–3.6V sources; operates in Burst Mode between radio transmissions. Use Value: 8µA quiescent current maximizes battery life; programmable soft-start prevents wake-up current spikes; SS pin enables wake-on-event sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EMSE#PBF | 4-switch synchronous buck-boost controller; no integrated gate drivers; requires external high-side/lower-side drivers. | Supports bidirectional power flow and wider VIN/VOUT ratios; lacks Burst Mode and spread-spectrum EMI reduction. | Select when bidirectional operation or >95% efficiency across wide load range is critical; not drop-in for LT8357JMSE#PBF layouts. |
| MAX20096ATPA/VY+ | Automotive-grade 60V boost controller with integrated 2A gate drivers; fixed 2.2MHz frequency; no spread-spectrum or programmable soft-start. | Designed for camera modules and infotainment displays; lacks SEPIC/flyback support and external sync capability. | Choose for simplified layout in 2.2MHz-only automotive boost apps; requires redesign for SEPIC/flyback or frequency tuning. |
Compared with LTC3789EMSE#PBF and MAX20096ATPA/VY+, the LT8357JMSE#PBF uniquely combines AEC-Q100 qualification, 3-topology flexibility (boost/SEPIC/flyback), spread-spectrum EMI control, and sub-10µA Burst Mode - making it optimal for space-constrained, noise-sensitive automotive and industrial converters where topology adaptability and ultra-low IQ are mandatory.
Availability
LT8357JMSE#PBF is available at Aetrix Electronics and suitable for automotive powertrain monitoring, industrial 24V boost supplies, and portable test equipment requiring stable component supply with full AEC-Q100 compliance and long-term production continuity.
Supply support for LT8357JMSE#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.
The LT8357JMSE#PBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC controllers, designed specifically for robust, low-EMI power conversion in automotive and harsh-environment industrial applications.
FAQ
What is the maximum junction temperature rating for the LT8357JMSE#PBF?
The LT8357JMSE#PBF is rated for operation up to +150°C junction temperature and is AEC-Q100 qualified for automotive Grade 1 applications. Its thermal shutdown activates above ~165°C, and continuous operation above 150°C requires derating per Analog Devices' lifetime models. The exposed pad (Pin 13) must be soldered to a thermal pad for effective heat dissipation.
Does the LT8357JMSE#PBF support SEPIC and flyback topologies out of the box?
Yes, the LT8357JMSE#PBF natively supports boost, SEPIC, and flyback configurations without external components beyond standard magnetics and FETs. Its current-mode architecture, split-gate drive, and dedicated SENSE pin enable accurate peak-current control in all three topologies. Application schematics for each are provided in the official datasheet (Rev. A, pages 1–2).
How does the LT8357JMSE#PBF achieve 8µA quiescent current in Burst Mode?
The LT8357JMSE#PBF achieves 8µA typical quiescent current by entering deep sleep between output pulses in Burst Mode: internal logic, oscillator, and gate drivers are disabled except for essential bias currents, while the SS pin is held low and the FB regulation point drops to ~10mV on SENSE. This state persists until load demand triggers a controlled restart sequence.
Can the LT8357JMSE#PBF be synchronized to an external clock, and what are the requirements?
Yes, the LT8357JMSE#PBF accepts external synchronization via the SYNC/MODE pin. Required clock parameters: 100kHz–2MHz frequency, 10%–90% duty cycle, high level >2.5V, low level <0.4V. The RT resistor must still be installed and matched to the external clock frequency. During sync, Burst Mode is disabled and pulse-skipping is used instead.
What is the purpose of the split-gate drive (GATEP and GATEN) on the LT8357JMSE#PBF?
The split-gate drive separates pull-up (GATEP, 2.2Ω) and pull-down (GATEN, 0.9Ω) paths to independently optimize MOSFET switching: a larger external resistor on GATEP slows turn-on for EMI reduction, while minimal resistance on GATEN ensures fast turn-off to prevent shoot-through and minimize body-diode conduction loss - achieving both low EMI and high efficiency.
LT8357JMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT8357JMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8357JMSE#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 LT8357JMSE#PBF reliable?
The price and inventory of LT8357JMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8357JMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8357JMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8357JMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8357JMSE#PBF?
LT8357JMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8357JMSE#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 LT8357JMSE#PBF?
For technical support, including LT8357JMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8357JMSE#PBF requirements.
6.How does Aetrix verify that LT8357JMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8357JMSE#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 LT8357JMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8357JMSE#PBF?
All LT8357JMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8357JMSE#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 LT8357JMSE#PBF part is unused and in its original packaging.
Return procedure for LT8357JMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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