My Inquiry
My Account
Analog Devices Inc. LT3757AEMSE#PBF
- Part No.:
- LT3757AEMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3757AEMSE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:418
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3757AEMSE#PBF from Analog Devices is a wide-input (2.9V–40V), current-mode DC/DC controller for boost, flyback, SEPIC, and inverting topologies, driving external N-channel MOSFETs with an internal 7.2V LDO gate supply. It features programmable 50kHz–1MHz switching frequency, <1µA shutdown current, and AEC-Q100 qualification for automotive use.
For engineers reviewing the LT3757AEMSE#PBF datasheet, LT3757AEMSE#PBF pinout, LT3757AEMSE#PBF application, or LT3757AEMSE#PBF equivalent, key selection considerations include its dual-polarity feedback capability (±0.8V/1.6V FBX reference), soft-start and frequency foldback for short-circuit protection, and thermally enhanced 10-pin MSOP package with exposed pad.
Technical Context
The LT3757AEMSE#PBF implements fixed-frequency current-mode control with slope compensation, enabling stable regulation across wide input/output voltage ranges and fast transient response. Its error amplifier supports both positive- and negative-output configurations via a single FBX pin with dual reference thresholds (1.6V for positive, –0.8V for negative outputs).
It integrates a 7.2V low-dropout regulator (LDO) for gate drive, programmable UVLO on SHDN/UVLO with hysteresis, and synchronization capability via the SYNC pin-requiring RT biasing 20% below external clock frequency. Minimum on/off times are each 220ns, limiting maximum duty cycle and minimum achievable output voltage in certain topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 40V - supports direct battery input (e.g., 3S Li-ion, 12V/24V automotive rails) without pre-regulation. |
| Switching Frequency | 50kHz to 1MHz - set by RT resistor; enables trade-off between efficiency (lower f) and magnetics size (higher f). |
| FBX Reference Voltage | +1.6V or –0.8V - single-pin polarity selection enables boost/flyback (positive) or inverting (negative) output without hardware change. |
| SENSE Threshold | 110mV (typ) - sets peak switch current limit; determines max power handling with external sense resistor. |
| Shutdown Current | <1µA - enables long-term battery operation in always-on systems like telematics or ADAS sensors. |
| INTVCC Regulator | 7.2V ±0.2V - powers gate driver and internal circuitry; bypass requires ≥4.7µF ceramic capacitor at pin. |
| Package | 10-Lead MSOP (3mm × 3mm) with exposed thermal pad - θJA = 40°C/W; requires soldered GND pad for thermal reliability. |
Pinout & Package
LT3757AEMSE#PBF is housed in a thermally enhanced 10-lead plastic MSOP package (3mm × 3mm) with exposed pad (Pin 11) that must be soldered to PCB ground for thermal and electrical integrity. Maximum junction temperature is 125°C for E-grade operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier compensation node | Connects external RC network to stabilize voltage loop; clamped during soft-start and fault conditions. |
| FBX (Pin 2) | Feedback input / polarity selector | Dual-reference input: +1.6V for positive outputs, –0.8V for negative outputs; also triggers frequency foldback near GND. |
| SS (Pin 3) | Soft-start timing node | 10µA pull-up to 2.5V rail; external capacitor sets ramp time; reset by UV/OV/thermal events. |
| RT (Pin 4) | Oscillator frequency programming | Resistor to GND sets switching frequency (50kHz–1MHz); open-circuit disables operation. |
| SYNC (Pin 5) | External clock synchronization input | Accepts digital clock; requires RT biasing 20% below sync frequency; ignored when FBX ≈ GND. |
| SENSE (Pin 6) | Current sense comparator input | Kelvin-connected to high-side of sense resistor; monitors switch current for peak limiting and PWM control. |
| GATE (Pin 7) | N-MOSFET gate driver output | Swings between INTVCC and GND; forced low during shutdown, thermal lockout, or INTVCC UV/OV. |
| INTVCC (Pin 8) | Internal LDO output | 7.2V regulated supply for gate driver and logic; bypass with ≥4.7µF ceramic cap; can be externally powered above 7.5V. |
| SHDN/UVLO (Pin 9) | Enable/disable and input UVLO control | 1.22V falling threshold with programmable hysteresis; pulls VIN IQ below 1µA when ≤0.4V. |
| VIN (Pin 10) | Main input supply | 2.9V–40V input; requires local 0.22µF+ ceramic bypass; powers internal LDO and logic. |
| Exposed Pad (Pin 11) | Thermal & signal ground | Must be soldered to PCB ground plane; serves as SENSE return path and primary thermal conduction path. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range with low start-up voltage | Operates down to 2.9V VIN - enables direct interface with single-cell Li-ion or 3.3V logic rails without boost pre-regulator. |
| Dual-polarity feedback architecture | Single FBX pin supports both +1.6V (boost/flyback/SEPIC) and –0.8V (inverting) configurations - reduces BOM count and layout complexity. |
| Programmable soft-start and frequency foldback | SS pin controls controlled output ramp; foldback reduces frequency during overcurrent - limits inductor stress and prevents saturation at startup/fault. |
| AEC-Q100 qualified (Grade E) | Rated for –40°C to +125°C junction temperature - validated for automotive infotainment, lighting, and ADAS subsystems. |
| Low shutdown quiescent current | <1µA VIN supply current in shutdown - extends battery life in always-on vehicle modules (e.g., CAN wake-up receivers). |
Applications
| Automotive LED Headlamp Driver | Industrial Isolated Flyback PSU |
|---|---|
|
Use Scenario: Driving high-brightness LEDs from 12V vehicle battery with precise current regulation and dimming support. IC Role / Device Role / Timing Role: Boost controller regulating LED string current via SENSE feedback; FBX configured for positive output; SYNC used to align switching with EMI-sensitive periods. Use Value: 2.9V start-up ensures operation during cold cranking; <1µA shutdown preserves battery; AEC-Q100 grade meets automotive reliability requirements. |
Use Scenario: Generating isolated 15V/500mA auxiliary supply from 24V industrial bus for PLC I/O modules. IC Role / Device Role / Timing Role: Flyback controller with optocoupler feedback to FBX; INTVCC powered from secondary winding via diode; RT set to 300kHz for compact transformer design. Use Value: Dual-reference FBX simplifies feedback network; 40°C/W θJA enables convection-cooled operation; programmable UVLO avoids brownout resets. |
| Portable Medical Instrument Power | Telecom DC-DC Intermediate Bus Converter |
|
Use Scenario: Generating ±5V rails from single 3.7V Li-ion cell for analog front-end and microcontroller in handheld diagnostics device. IC Role / Device Role / Timing Role: Inverting converter (FBX pulled to –0.8V) for negative rail; boost stage (FBX = +1.6V) for positive rail; soft-start prevents inrush into capacitive loads. Use Value: Single-controller dual-rail generation reduces component count; 220ns min on-time enables high step-up ratio; low IQ extends runtime. |
Use Scenario: Stepping 48V telecom bus down to 12V intermediate rail for downstream POL converters in base station equipment. IC Role / Device Role / Timing Role: High-efficiency boost controller operating at 500kHz; SYNC tied to system clock for deterministic EMI; SENSE monitors primary current for OCP. Use Value: 40V absolute max VIN accommodates 48V transients; 7.2V INTVCC ensures robust gate drive for high-side MOSFETs; exposed pad enables high-power density layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3757EMSE#PBF | Base version with slower load transient response; identical pinout, package, and core specs. | Lacks LT3757A's improved transient performance - less suitable for rapidly varying loads like RF PA bias supplies. | Select LT3757AEMSE#PBF when fast line/load regulation is required; otherwise LT3757EMSE#PBF offers cost parity for static loads. |
| LM5122MM/NOPB | TI part with integrated high-side gate driver; wider 3V–65V input; no native negative-output support. | Requires external level-shifting for inverting topologies; lacks dual FBX reference - limits topology flexibility vs. LT3757A. | Choose LM5122MM/NOPB for high-voltage boost/flyback where integrated driver simplifies layout; retain LT3757AEMSE#PBF for dual-polarity or automotive AEC-Q100 needs. |
Compared with LT3757EMSE#PBF, the LT3757AEMSE#PBF delivers measurably faster load transient recovery, while LM5122MM/NOPB trades topology versatility for higher input voltage range and integrated driver - making LT3757AEMSE#PBF optimal for automotive and multi-topology designs requiring AEC-Q100 compliance.
Availability
LT3757AEMSE#PBF is available at Aetrix Electronics and suitable for automotive LED drivers, industrial flyback PSUs, portable medical instrument power, and telecom intermediate bus converters requiring stable component supply, AEC-Q100 qualification, and dual-polarity topology support.
Supply support for LT3757AEMSE#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 with precision power, signal chain, and RF solutions.
The LT3757A series belongs to Analog Devices' high-voltage DC/DC controller product line, designed specifically for rugged, multi-topology power conversion in automotive and industrial environments where wide input range, low IQ, and AEC-Q100 compliance are critical.
FAQ
What is the key functional difference between LT3757AEMSE#PBF and LT3757EMSE#PBF?
The LT3757AEMSE#PBF features improved load transient performance compared to the LT3757EMSE#PBF, as confirmed in the datasheet's "Features" section and typical performance curves. Both share identical pinout, package, temperature range (–40°C to +125°C), and core specifications-including 2.9V–40V input, 50kHz–1MHz frequency range, and dual FBX reference. The "A" suffix denotes this specific enhancement, making LT3757AEMSE#PBF preferable for applications with dynamic load steps, such as LED dimming or RF amplifier biasing.
Can LT3757AEMSE#PBF generate negative output voltages, and how is it configured?
Yes, LT3757AEMSE#PBF supports negative output generation in inverting converter topology. Configuration requires pulling the FBX pin to –0.8V using an external resistor divider from VOUT to GND. This activates comparator A2 (per Block Diagram Fig. 1), enabling non-inverting amplification from FBX to VC. The datasheet confirms this dual-polarity capability under "DESCRIPTION" and "APPLICATIONS INFORMATION", with explicit reference to –0.8V regulation and inverting configuration.
What is the recommended minimum capacitor value for INTVCC bypassing on LT3757AEMSE#PBF?
The datasheet specifies a minimum 4.7µF ceramic capacitor placed immediately adjacent to the INTVCC and GND pins for effective bypassing. This value is mandated in the "INTVCC Regulator Bypassing and Operation" section (page 10) to handle high transient gate-drive currents and prevent INTVCC droop during switching. Using lower capacitance risks instability, premature UVLO triggering, or reduced gate drive strength-especially at high frequencies or with large MOSFETs.
Does LT3757AEMSE#PBF require an external resistor on the RT pin, and what happens if it's omitted?
Yes, LT3757AEMSE#PBF requires an external resistor from RT (Pin 4) to GND for proper oscillator operation. The datasheet states "Do not leave this pin open" in the "PIN FUNCTIONS" section (page 7). An open RT pin results in undefined or disabled switching behavior-confirmed by the absence of any "no-resistor" operating mode in Electrical Characteristics or Typical Performance graphs. RT values are tabulated for 50kHz–1000kHz; omission prevents functional operation.
Is LT3757AEMSE#PBF pin-compatible with LT3757EMSE#PBF, and can they be interchanged on the same PCB?
Yes, LT3757AEMSE#PBF and LT3757EMSE#PBF are pin-compatible and share identical 10-pin MSOP package dimensions, pinout, and footprint. The order information table (page 2) lists both with identical "PACKAGE DESCRIPTION: 10-Lead (3mm × 3mm) Plastic MSOP" and "PART MARKING*: LTDYX". No layout changes are needed for substitution, though firmware or compensation networks may require adjustment if leveraging the LT3757A's enhanced transient response.
LT3757AEMSE#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
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive and Negative
- Topology:
- Boost, Flyback, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 2.9V ~ 40V
- Frequency - Switching:
- 100kHz ~ 1MHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3757AEMSE#PBF FAQ
1.How can I place an order for LT3757AEMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3757AEMSE#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 LT3757AEMSE#PBF reliable?
The price and inventory of LT3757AEMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3757AEMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3757AEMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3757AEMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3757AEMSE#PBF?
LT3757AEMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3757AEMSE#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 LT3757AEMSE#PBF?
For technical support, including LT3757AEMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3757AEMSE#PBF requirements.
6.How does Aetrix verify that LT3757AEMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3757AEMSE#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 LT3757AEMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3757AEMSE#PBF?
All LT3757AEMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3757AEMSE#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 LT3757AEMSE#PBF part is unused and in its original packaging.
Return procedure for LT3757AEMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3757AEMSE#PBF 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…
