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Analog Devices Inc. LT8357EMSE#PBF
- Part No.:
- LT8357EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8357EMSE#PBF.pdf
- Description:
- LOW-IQ 2MHZ 60V ISOLATED SEPIC F
- Quantity:
- Payment:
- Shipping:
Inventory:876
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Product details
Overview
LT8357EMSE#PBF 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 quiescent current in Burst Mode®, 2MHz switching capability, ±1.5% 1V internal reference, and split-gate N-channel MOSFET drive. It targets automotive powertrain battery monitoring and industrial battery-powered systems requiring high efficiency at light load.
For engineers reviewing the LT8357EMSE#PBF datasheet, LT8357EMSE#PBF pinout, LT8357EMSE#PBF application, or LT8357EMSE#PBF equivalent, key selection considerations include its AEC-Q100 qualification, programmable soft-start, spread-spectrum EMI reduction, and dual-mode light-load operation (pulse-skipping or low-ripple Burst Mode®).
Technical Context
The LT8357EMSE#PBF implements fixed-frequency current-mode control with adjustable 100kHz–2MHz operation via RT resistor or external clock synchronization on SYNC/MODE. Its architecture includes slope compensation, frequency foldback below 75% FB voltage, and accurate 1V error amplifier reference with ±1.5% tolerance over temperature.
It integrates a 5V/60mA INTVCC LDO powered from VIN, dual-gate drivers (GATEP/GATEN) with 2.2Ω pull-up and 0.9Ω pull-down resistance, and fault protection including output short-circuit detection in SEPIC/flyback configurations, PGOOD open-drain signaling, and thermal shutdown at ~165°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports direct connection to automotive battery (cold-crank down to 3V) and industrial HV rails 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 sync; higher frequencies reduce inductor/capacitor size for compact layouts. |
| FB Regulation Voltage | 1.000V ±1.5% - precise reference enables stable output regulation across temperature and line/load variations. |
| INTVCC Output | 4.95V at 20mA - powers internal logic and gate drivers; requires ≥2.2µF local ceramic bypass for transient gate charge delivery. |
| SENSE Threshold | 60mV typical - sets peak inductor current limit; enables accurate current sensing with low-value, low-power sense resistors. |
| Operating Junction Temp | –40°C to 125°C - qualified per AEC-Q100 Grade E, suitable for under-hood automotive environments. |
Pinout & Package
LT8357EMSE#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 affects transient response and phase margin. |
| FB | Output voltage feedback input | Regulated to 1.000V; connects to resistor divider from VOUT to GND to set output voltage precisely. |
| PGOOD | Open-drain power-good indicator | Pulled low when FB deviates >±8% from target; requires external pull-up for system sequencing or fault reporting. |
| SS | Soft-start timing capacitor node | Charged by 15µA internal current; controls output ramp rate and prevents inrush current during startup. |
| RT | Oscillator frequency setting | Resistor to GND sets switching frequency from 100kHz to 2MHz; enables layout-driven EMI optimization. |
| SYNC/MODE | Mode selection & sync input | Configures five operating modes: external sync, spread spectrum, pulse-skipping, or Burst Mode®. |
| SENSE | Current sense comparator input | Kelvin-connected to sense resistor; detects overcurrent with 60mV threshold for reliable short-circuit protection. |
| GATEP / GATEN | Split N-MOSFET gate drivers | GATEP pulls up (2.2Ω), GATEN pulls down (0.9Ω); enables independent optimization of EMI and efficiency via external gate resistors. |
| INTVCC | Internal 5V regulator output | Supplies internal circuitry and gate drivers; must be bypassed with ≥2.2µF ceramic capacitor to handle peak gate charge demands. |
| EN/UVLO | Enable and undervoltage lockout | Accurate 1.220V rising threshold enables programmable UVLO using resistor divider from VIN. |
| VIN | Main input supply | Accepts 3V–60V; powers INTVCC LDO and provides bias for control circuitry; 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 management and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Split-gate N-MOSFET driver | Independent 2.2Ω pull-up and 0.9Ω pull-down enable simultaneous EMI suppression and conduction loss minimization. |
| Spread-spectrum frequency modulation | 19% triangular dither above oscillator frequency reduces peak EMI by >10dB without affecting regulation stability. |
| Burst Mode® operation | 8µA quiescent current with low-output-ripple operation preserves battery life while maintaining tight output regulation. |
| Programmable soft-start | Linear ramp via SS pin capacitor prevents inrush current and ensures controlled power-up in multi-rail systems. |
| AEC-Q100 Grade E qualification | Validated for –40°C to 125°C operation with process and reliability testing per automotive standards. |
Applications
| Automotive Powertrain Battery Monitoring | Industrial 24V Rail Boost Converter |
|---|---|
Use Scenario: Real-time voltage and state-of-health monitoring of 12V/48V hybrid vehicle battery packs under cold-crank and load-dump conditions. IC Role / Device Role / Timing Role: Controller for isolated flyback converter powering isolated ADCs, CAN transceivers, and microcontrollers from varying battery voltage. Use Value: 3V–60V input range handles cold-crank dips and load-dump spikes; AEC-Q100 qualification ensures reliability in harsh under-hood environments. |
Use Scenario: Generating stable 24V/2A output from fluctuating 8V–16V industrial supply (e.g., PoE++ midspan or PLC backplane). IC Role / Device Role / Timing Role: High-frequency boost controller enabling compact magnetics and low-profile layout in space-constrained DIN-rail modules. Use Value: 2MHz operation allows <2.2µH inductors and <22µF output capacitance; 95% efficiency at full load reduces thermal design burden. |
| Portable Medical Instrument Power Supply | Smart Sensor Node Energy Harvester Interface |
Use Scenario: Powering portable ultrasound or ECG devices from single-cell Li-ion (3.0–4.2V) while delivering regulated 5V/3.3V rails. IC Role / Device Role / Timing Role: SEPIC controller providing non-inverting buck-boost conversion with seamless transition across battery discharge curve. Use Value: 8µA Burst Mode® quiescent current extends runtime between charges; ±1.5% FB reference ensures accurate analog front-end biasing. |
Use Scenario: Conditioning low-current, variable-voltage output from thermoelectric or piezoelectric energy harvesters (e.g., 0.5–5V input) into stable 3.3V for BLE/Wi-Fi SoCs. IC Role / Device Role / Timing Role: Ultra-low-IQ boost controller enabling start-up from sub-1V harvester outputs via programmable UVLO and soft-start. Use Value: 3V minimum input and 8µA sleep current allow operation even during low-energy ambient conditions; frequency foldback prevents instability at ultra-light loads. |
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 | Wider 4V–36V input; synchronous 4-switch buck-boost topology; no integrated gate drivers - requires external FETs. | Targeted at high-efficiency, high-current (>5A) applications where synchronous rectification is mandatory. | Select LTC3789EMSE#PBF only when bidirectional power flow or >95% full-load efficiency at >3A is required; not drop-in compatible. |
| MAX25203ATPA/VY+ | Automotive-qualified boost controller (AEC-Q100); 4.5V–60V input; integrated high-side switch; fixed 2.2MHz frequency. | Designed for simpler, lower-component-count boost supplies where integrated switch eliminates external MOSFET layout complexity. | Choose MAX25203ATPA/VY+ for cost-sensitive, lower-power (<1.5A) automotive boosts where board space is constrained and external FETs are undesirable. |
Compared with LTC3789EMSE#PBF and MAX25203ATPA/VY+, the LT8357EMSE#PBF uniquely balances ultra-low quiescent current (8µA), flexible topology support (boost/SEPIC/flyback), and split-gate drive for EMI-critical designs - making it optimal for battery-monitoring and portable industrial sensors where efficiency at microamp loads and electromagnetic compatibility are co-primary requirements.
Availability
LT8357EMSE#PBF is available at Aetrix Electronics and suitable for automotive powertrain monitoring, industrial 24V rail generation, and portable medical instrumentation requiring stable component supply with long-term lifecycle assurance.
Supply support for LT8357EMSE#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 precision, industrial, automotive, and communications markets.
The LT8357EMSE#PBF belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-voltage, low-quiescent-current DC/DC conversion in automotive and industrial environments demanding robustness, EMI resilience, and extended temperature operation.
FAQ
What is the maximum switching frequency supported by the LT8357EMSE#PBF?
The LT8357EMSE#PBF supports up to 2MHz switching frequency, set either by an external resistor on the RT pin or synchronized to an external clock signal between 100kHz and 2MHz. At 2MHz, the device maintains >95% efficiency in typical boost configurations and enables compact magnetic and capacitive component selection - critical for space-constrained automotive and portable applications.
Does the LT8357EMSE#PBF integrate a gate driver, and what type?
Yes, the LT8357EMSE#PBF integrates a split-gate driver with separate GATEP (pull-up) and GATEN (pull-down) terminals. GATEP has 2.2Ω on-resistance and GATEN has 0.9Ω, enabling independent optimization of turn-on slew rate (for EMI control) and turn-off speed (to prevent shoot-through). This architecture eliminates the need for external driver ICs in most boost/SEPIC/flyback designs.
How does the LT8357EMSE#PBF achieve low EMI in sensitive applications?
The LT8357EMSE#PBF reduces EMI through three integrated techniques: (1) triangle spread-spectrum frequency modulation (19% dither), (2) split-gate drive allowing independent gate resistor tuning, and (3) optional external clock synchronization to avoid noise-sensitive bands. These features collectively lower peak conducted emissions by >10dB compared to fixed-frequency operation - verified in standard CISPR 25 automotive EMI tests.
Is the LT8357EMSE#PBF qualified for automotive use?
Yes, the LT8357EMSE#PBF is AEC-Q100 Grade E qualified (–40°C to +125°C junction temperature), with full automotive-grade process control, reliability testing, and failure analysis documentation. It is explicitly rated for powertrain battery monitoring and other under-hood applications where thermal robustness and long-term reliability are mandatory.
What protection features does the LT8357EMSE#PBF include?
The LT8357EMSE#PBF includes output short-circuit protection in SEPIC and flyback configurations, overcurrent detection via SENSE pin (105mV threshold), PGOOD fault signaling, thermal shutdown (~165°C), and frequency foldback during low-FB conditions. It also features accurate EN/UVLO with hysteresis and internal soft-start to prevent inrush current - ensuring safe startup and fault recovery without external supervision.
LT8357EMSE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LT8357EMSE#PBF FAQ
1.How can I place an order for LT8357EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8357EMSE#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 LT8357EMSE#PBF reliable?
The price and inventory of LT8357EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8357EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8357EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8357EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8357EMSE#PBF?
LT8357EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8357EMSE#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 LT8357EMSE#PBF?
For technical support, including LT8357EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8357EMSE#PBF requirements.
6.How does Aetrix verify that LT8357EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8357EMSE#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 LT8357EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8357EMSE#PBF?
All LT8357EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8357EMSE#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 LT8357EMSE#PBF part is unused and in its original packaging.
Return procedure for LT8357EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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