My Inquiry
My Account
Analog Devices Inc. LT8357EMSE#TRPBF
- Part No.:
- LT8357EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8357EMSE#TRPBF.pdf
- Description:
- LOW-IQ 2MHZ 60V ISOLATED SEPIC F
- Quantity:
- Payment:
- Shipping:
Inventory:4,851
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8357EMSE#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 quiescent current in Burst Mode®, 2MHz switching capability, ±1.5% 1V internal reference, and split-gate N-channel MOSFET drive. It is used in automotive battery monitoring and industrial powertrain systems requiring high-voltage resilience and low-noise operation.
For engineers reviewing the LT8357EMSE#TRPBF datasheet, LT8357EMSE#TRPBF pinout, LT8357EMSE#TRPBF application, or LT8357EMSE#TRPBF equivalent, key selection considerations include its AEC-Q100 qualification, programmable soft-start, spread-spectrum EMI reduction, 12-lead MSOP thermal performance, and dual-mode light-load operation (Burst Mode® vs pulse-skipping).
Technical Context
The LT8357EMSE#TRPBF implements fixed-frequency current-mode control with adjustable 100kHz–2MHz operation via RT resistor or external clock synchronization on SYNC/MODE. Its dual-gate driver (GATEP/GATEN) enables independent pull-up (2.2Ω) and pull-down (0.9Ω) resistance for optimized EMI and efficiency.
It integrates an internal 5V LDO (INTVCC) with 60mA current limit and 2.5V UVLO threshold, supports frequency foldback below 75% FB voltage to prevent current runaway during short-circuit startup, and delivers accurate enable hysteresis (42mV) for robust VIN UVLO programming using EN/UVLO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports direct connection to automotive batteries (12V/24V/48V), industrial rails, and wide-range battery packs without pre-regulation. |
| Quiescent Current (Burst Mode®) | 8µA typical - enables multi-year battery life in always-on monitoring systems like powertrain sensors. |
| Switching Frequency Range | 100kHz to 2MHz - selectable via RT resistor or external sync; higher frequencies reduce inductor/capacitor size for compact designs. |
| FB Regulation Voltage | 1.000V ±1.5% - provides precise output voltage setting across temperature; enables stable 24V/48V outputs with <±0.5% error. |
| Gate Drive Architecture | 5V split gate (GATEP/GATEN) - allows independent optimization of turn-on slew rate (EMI) and turn-off speed (efficiency) using external resistors. |
| Thermal Rating | –40°C to +125°C junction - qualified per AEC-Q100 Grade E, suitable for under-hood automotive environments. |
| Spread Spectrum Modulation | 19% triangle FM - reduces peak conducted EMI by spreading energy across bandwidth, easing EMC compliance in noise-sensitive systems. |
Pinout & Package
LT8357EMSE#TRPBF is housed in a thermally enhanced 12-lead MSOP package with exposed pad (Pin 13) soldered to PCB ground for optimal thermal dissipation (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC | Error amplifier compensation node | Connects external RC network to stabilize control loop; determines phase margin and transient response. |
| FB | Output voltage feedback input | Regulated to 1.000V; sets output via resistor divider; accuracy directly impacts output regulation tolerance. |
| 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 ramp rate of output voltage; hard-pulled low during faults or shutdown. |
| RT | Oscillator frequency setting | Resistor-to-ground sets switching frequency from 100kHz to 2MHz; defines minimum on/off times and EMI profile. |
| SYNC/MODE | Mode selection & external sync input | Selects between burst/pulse-skip, spread spectrum on/off, and external clock sync; disables burst mode when synced. |
| SENSE | Current sense comparator input | Kelvin-connected to sense resistor; 60mV typical threshold sets peak inductor current; critical for overcurrent protection. |
| GATEP | N-MOSFET gate pull-up driver | Drives gate from GND to INTVCC (≈5V); 2.2Ω pull-up enables controlled turn-on for EMI reduction. |
| GATEN | N-MOSFET gate pull-down driver | Drives gate from GND to INTVCC; 0.9Ω pull-down ensures fast turn-off to prevent shoot-through and SW node ringing. |
| INTVCC | Internal 5V LDO output | Powers internal logic and gate drivers; must be bypassed with ≥2.2µF ceramic cap; not for external loading. |
| EN/UVLO | Enable and undervoltage lockout input | 0.3V shutdown / 1.220V enable threshold with 42mV hysteresis; enables programmable VIN UVLO using resistor divider. |
| VIN | Main input supply | Accepts 3V–60V; powers INTVCC LDO; requires local 0.1µF ceramic bypass to suppress high-frequency noise. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade E qualification | Validated for automotive applications including powertrain battery monitoring and ADAS subsystems operating at –40°C to +125°C. |
| Split-gate N-MOSFET driver | Independent GATEP (2.2Ω) and GATEN (0.9Ω) outputs allow simultaneous EMI optimization (slow turn-on) and efficiency (fast turn-off). |
| Burst Mode® operation | Reduces input quiescent current to 8µA while maintaining <15mVpp output ripple - ideal for always-on battery-powered sensors. |
| Spread-spectrum frequency modulation | 19% triangle dithering lowers peak conducted EMI by >10dB, simplifying compliance with CISPR 25 Class 5 in automotive designs. |
| Programmable soft-start and tracking | SS pin supports monotonic output ramp-up via external capacitor; enables power sequencing with downstream regulators or FPGAs. |
| Frequency foldback protection | Automatically reduces switching frequency when FB drops below 75% of regulation voltage - prevents inductor current runaway during short-circuit startup. |
Applications
| Automotive Powertrain Monitoring | Industrial 48V DC-DC Conversion |
|---|---|
Use Scenario: Real-time voltage/current sensing of 12V/48V hybrid vehicle battery stacks with isolated CAN communication. IC Role / Device Role / Timing Role: Boost controller generating isolated 5V/3.3V rails for ADCs, isolators, and microcontrollers from variable battery input. Use Value: 60V absolute max rating withstands load-dump transients; AEC-Q100 qualification ensures reliability in under-hood environments. |
Use Scenario: Compact 48V-to-12V intermediate bus converter in factory automation PLCs with space-constrained PCB layouts. IC Role / Device Role / Timing Role: High-frequency (2MHz) SEPIC controller enabling small magnetics and low-profile capacitors in dense industrial modules. Use Value: 2MHz operation reduces inductor volume by >50% vs 500kHz solutions; spread spectrum meets IEC 61000-6-4 radiated emissions limits. |
| Portable Medical Instrumentation | Smart Building Sensor Nodes |
Use Scenario: Battery-powered handheld diagnostic device requiring 24V bias for ultrasound transducers and 3.3V for ARM Cortex-M4 MCU. IC Role / Device Role / Timing Role: Dual-output flyback controller delivering regulated high-voltage and logic rails from single Li-ion cell (2.7V–4.2V). Use Value: 3V min input enables operation down to near-empty battery; 8µA Burst Mode® extends runtime beyond 3 months on 2000mAh cell. |
Use Scenario: Wireless occupancy sensor node powered by coin-cell battery, transmitting BLE data every 5 minutes. IC Role / Device Role / Timing Role: Low-IQ boost controller powering 3.3V RF SoC and analog front-end from 1.8V–3.6V primary cell. Use Value: 8µA quiescent current minimizes standby drain; programmable UVLO prevents brownout resets during cold-temperature deployment. |
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#TRPBF | 4-switch synchronous buck-boost controller; no integrated gate drivers; requires external high-side/lower-side drivers. | Supports bidirectional power flow and wider VOUT/VIN ratio; lacks Burst Mode® and spread spectrum. | Choose LTC3789 for applications needing buck-boost topology with >95% efficiency at medium loads; avoid if low-IQ or EMI-critical. |
| MAX20098ATPA/VY+ | Automotive-grade 60V boost controller with integrated 2A gate drivers; fixed 2.2MHz frequency; no spread spectrum or programmable soft-start. | Qualified to AEC-Q100 Grade 0 (–40°C to +150°C); includes watchdog timer and fault reporting registers. | Choose MAX20098 for ASIL-B systems requiring built-in diagnostics; avoid if design needs frequency sync or Burst Mode® flexibility. |
Compared with LTC3789EFE#TRPBF and MAX20098ATPA/VY+, the LT8357EMSE#TRPBF uniquely combines ultra-low 8µA quiescent current, 19% spread spectrum, and split-gate drive in a single AEC-Q100-compliant package-making it optimal for EMI-sensitive, battery-constrained automotive and industrial converters where topology flexibility (boost/SEPIC/flyback) is required.
Availability
LT8357EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive powertrain monitoring, industrial 48V DC-DC conversion, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8357EMSE#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 automotive markets since 1965.
The LT8357EMSE#TRPBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-voltage, low-quiescent-current DC/DC conversion in harsh environments-including automotive, industrial, and battery-powered systems demanding AEC-Q100 reliability and EMI robustness.
FAQ
What is the maximum input voltage rating for the LT8357EMSE#TRPBF?
The LT8357EMSE#TRPBF has an absolute maximum input voltage rating of 60V on the VIN pin, with guaranteed operation from 3V to 60V. This enables direct interface with 12V, 24V, and 48V automotive and industrial buses, including tolerance for ISO 7637-2 load-dump transients up to 60V. Exceeding 60V may cause permanent damage per Absolute Maximum Ratings.
Does the LT8357EMSE#TRPBF support spread-spectrum frequency modulation?
Yes, the LT8357EMSE#TRPBF supports triangle spread-spectrum frequency modulation with ±19% deviation when the SYNC/MODE pin is tied to INTVCC or pulled to ground via a 100kΩ resistor. This feature reduces peak conducted EMI amplitude by distributing switching energy across a wider bandwidth, easing compliance with CISPR 25 and FCC Part 15 requirements without added filtering.
How does the LT8357EMSE#TRPBF achieve 8µA quiescent current?
The LT8357EMSE#TRPBF achieves 8µA typical quiescent current in Burst Mode® by disabling most internal circuitry-including oscillator, gate drivers, and error amplifier-during extended sleep periods. During each cycle, it delivers a single small current pulse to maintain output regulation, then enters deep sleep until the output voltage droops sufficiently to trigger the next pulse. This behavior is enabled via SYNC/MODE pin configuration.
Can the LT8357EMSE#TRPBF be used in flyback configurations with primary-side sensing?
Yes, the LT8357EMSE#TRPBF supports flyback operation with primary-side sensing using the SENSE pin to monitor reflected voltage across the auxiliary winding. The controller regulates output by comparing the sensed voltage to the internal 1.000V reference, eliminating need for optocoupler or secondary-side feedback. Design requires careful transformer turns ratio selection and slope compensation tuning per Analog Devices Application Note AN149.
What is the purpose of the split-gate drive (GATEP and GATEN) on the LT8357EMSE#TRPBF?
The split-gate drive on the LT8357EMSE#TRPBF separates pull-up (GATEP, 2.2Ω) and pull-down (GATEN, 0.9Ω) paths to independently optimize EMI and efficiency. A larger series resistor on GATEP slows turn-on for reduced dv/dt and EMI, while low-resistance GATEN ensures rapid turn-off to prevent shoot-through and minimize conduction losses - a key advantage over single-driver controllers.
LT8357EMSE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LT8357EMSE#TRPBF FAQ
1.How can I place an order for LT8357EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8357EMSE#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 LT8357EMSE#TRPBF reliable?
The price and inventory of LT8357EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8357EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8357EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8357EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8357EMSE#TRPBF?
LT8357EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8357EMSE#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 LT8357EMSE#TRPBF?
For technical support, including LT8357EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8357EMSE#TRPBF requirements.
6.How does Aetrix verify that LT8357EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8357EMSE#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 LT8357EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8357EMSE#TRPBF?
All LT8357EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8357EMSE#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 LT8357EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8357EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8357EMSE#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
