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Analog Devices Inc. LT3976EMSE#TRPBF
- Part No.:
- LT3976EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3976EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,198
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Product details
Overview
LT3976EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 40V input, 5A synchronous step-down DC/DC regulator with current-mode control, 3.3µA quiescent current, and adjustable 200kHz–2MHz switching frequency. It features low-ripple Burst Mode® operation (<15mVP-P), 500mV dropout voltage, and integrated 75mΩ NPN switch and boost Schottky diode. It is used in automotive cold-crank battery regulation and industrial 24V supply conversion.
For engineers reviewing the LT3976EMSE#TRPBF datasheet, LT3976EMSE#TRPBF pinout, LT3976EMSE#TRPBF application, or LT3976EMSE#TRPBF equivalent, key selection criteria include ultralow IQ at no load, programmable UVLO via EN pin, soft-start via SS pin, power-good flag timing accuracy, and thermal derating limits for 16-lead MSOP package operation up to 125°C junction temperature.
Technical Context
The LT3976EMSE#TRPBF implements a constant-frequency, current-mode buck architecture with internal compensation, enabling fast transient response and stable loop behavior across wide input (4.3V–40V) and output (adjustable down to 1.2V) ranges. Its bipolar NPN switch is driven by an external BOOST capacitor to ensure full saturation, sustaining low VCE(SAT) (80mV @ 1A) even under high-duty-cycle conditions.
It integrates multiple protection and control functions: accurate 1.02V EN threshold with 60mV hysteresis, open-drain PG flag asserting at 91.6% of regulated VOUT, current-limit foldback during short-circuit, and thermal shutdown. The device transitions seamlessly between PWM and Burst Mode based on load, maintaining <15mV ripple while drawing only 3.3µA at no load with VIN = 12V → 3.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.3V to 40V - supports automotive battery transients including cold-crank (4.5V) and load-dump (36V+). |
| Max Output Current | 5A - sustained continuous output with thermal management on standard 4-layer PCB; limited by current foldback above 125°C. |
| Quiescent Current | 3.3µA @ no load - enables >10-year battery life in always-on IoT sensors powered from 12V systems. |
| Switching Frequency | 200kHz to 2MHz - set by RT resistor; higher frequencies allow smaller inductors (e.g., 3.3µH @ 800kHz) but reduce max VIN/VOUT ratio. |
| Feedback Reference | 1.197V ±15mV - sets output accuracy; enables precise 3.3V, 5V, or custom rails using MΩ-level resistor dividers. |
| Dropout Voltage | 500mV - maintains regulation when VIN falls below VOUT; critical for automotive start-stop and brownout resilience. |
| Power Good Threshold | VOUT ≥ 91.6% of target - ensures reliable system enablement after startup; PG is open-drain with 480µA sink capability. |
Pinout & Package
LT3976EMSE#TRPBF is housed in a thermally enhanced 16-lead MSOP package (3mm × 4mm) with exposed pad (Pin 17) soldered to PCB ground for θJA = 40°C/W. Pin count and layout match industry-standard MSOP footprint; requires local VIN bypassing and BOOST capacitor placement per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback input | Regulates output by sensing divider voltage; internal 1.197V reference; connects to VOUT via R1/R2 network. |
| SS (Pin 2) | Soft-start control | Internal 1.8µA current source charges external capacitor; controls inrush current and prevents overshoot at startup. |
| OUT (Pin 3) | Boost diode anode / dropout sense | Connects to output node; supplies bias when VOUT > 3.2V; enables dropout comparator (500mV threshold). |
| BOOST (Pin 4) | Switch gate drive booster | Accepts externally charged capacitor (e.g., 10nF); generates >VIN voltage to saturate internal NPN switch. |
| SW (Pins 5–7) | Switch node | High-current output of internal NPN switch; connects to inductor, catch diode, and BOOST cap; requires snubber (2Ω + 470pF). |
| VIN (Pins 10–12) | Main power input | Supplies internal circuitry and switch driver; must be locally bypassed with low-ESR ceramic capacitors. |
| EN (Pin 13) | Enable control | Hysteretic threshold (1.02V fall / 1.08V rise); allows programmable UVLO; draws only 700nA in shutdown. |
| RT (Pin 14) | Frequency programming | Resistor to GND sets fSW from 200kHz to 2MHz; e.g., 41.2kΩ yields 1MHz. |
| PG (Pin 15) | Power good flag | Open-drain output; pulls low until FB reaches 91.6% of target; valid only when VIN > 2V. |
| SYNC (Pin 16) | External clock sync | Ground for Burst Mode; tie to external clock (250kHz–2MHz) for synchronized pulse-skipping; floating prohibited. |
| GND (Pin 17) | Power and signal ground | Exposed thermal pad; must be soldered to large PCB copper area for thermal performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.3µA IQ enables >10-year battery life in always-on automotive telematics and remote sensors. |
| Low-ripple Burst Mode® | Maintains <15mVP-P output ripple at light loads while preserving >85% efficiency down to 1mA output current. |
| Integrated boost diode | On-chip Schottky eliminates external diode, reducing BOM count and board area in space-constrained applications. |
| Current limit foldback | Reduces peak switch current from 10A to 4.8A during overload, limiting power dissipation and preventing thermal runaway. |
| Accurate programmable UVLO | 1.02V EN threshold with 60mV hysteresis allows precise system-level undervoltage detection without external comparators. |
Applications
| Automotive Battery Regulation | Industrial 24V Power Conversion |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery (4.5V–36V) to 3.3V for infotainment MCU during cold-crank and load-dump events. IC Role / Device Role / Timing Role: Primary buck controller managing input transients, dropout, and low-IQ sleep states. Use Value: Maintains 3.3V output with <15mV ripple and 3.3µA IQ during engine-off monitoring, extending battery life and ensuring reliable restart. | Use Scenario: Converting 24V factory bus to 5V for PLC I/O modules operating in ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC/DC stage delivering 5A continuous current with thermal foldback protection. Use Value: Delivers >92% efficiency at 2A load and sustains full 5A output with θJA = 40°C/W when exposed pad is properly soldered. |
| Portable Medical Instrumentation | Smart Building Sensor Nodes |
Use Scenario: Powering handheld ultrasound or glucose meter from dual AA batteries (1.8V–3.2V) boosted to 12V, then stepped down to 3.3V. IC Role / Device Role / Timing Role: Secondary buck regulator accepting wide-input pre-regulated rail with precise soft-start and PG signaling. Use Value: Soft-start (SS pin) prevents inrush into sensitive analog front-end; PG flag synchronizes MCU wake-up with stable 3.3V rail. | Use Scenario: Supplying 3.3V to LoRaWAN edge node with intermittent 100ms transmit bursts and multi-year battery life requirement. IC Role / Device Role / Timing Role: Always-on power manager enabling deep-sleep mode with sub-µA system leakage. Use Value: 3.3µA IQ and Burst Mode operation extend CR2032 battery life beyond 5 years while maintaining <15mV ripple during sensor readout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#TRPBF | Lower max input (15V), lower IQ (2.5µA), fixed 3.3V/5V options, no SYNC pin | Suitable for post-regulated 5V/12V rails only; lacks wide-input flexibility and frequency synchronization | Select when input is tightly regulated and ultra-low IQ is prioritized over input range and programmability |
| MPQ4333GJ-AEC1-P | 40V input, 3.5A, 17µA IQ, AEC-Q200 qualified, QFN-12 package | Automotive-grade with extended temp support (–40°C to 150°C), but higher IQ and no PG flag or soft-start | Select for AEC-Q200-compliant automotive body electronics where qualification outweighs feature parity |
Compared with LTC3631EMSE#TRPBF and MPQ4333GJ-AEC1-P, the LT3976EMSE#TRPBF uniquely balances 40V input tolerance, 5A output, 3.3µA IQ, and full feature set (PG, SS, SYNC, foldback) in a production-ready MSOP package-making it optimal for industrial and automotive subsystems requiring both ruggedness and precision control.
Availability
LT3976EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial 24V power conversion, portable medical instrumentation, and smart building sensor nodes requiring stable component supply and long-term lifecycle support.
Supply support for LT3976EMSE#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 acquired Linear Technology in 2017 and maintains its legacy of high-performance power management ICs with rigorous characterization and automotive-grade reliability testing.
The LT3976 belongs to Linear's high-voltage monolithic buck regulator product line, designed specifically for demanding applications such as automotive cold-crank, industrial 24V/48V systems, and battery-powered equipment requiring ultralow quiescent current and robust transient response.
FAQ
What is the absolute maximum input voltage rating for the LT3976EMSE#TRPBF?
The LT3976EMSE#TRPBF has an absolute maximum VIN rating of 40V. Exceeding this voltage risks permanent damage. For reliable operation, the recommended maximum continuous input is 36V to accommodate automotive load-dump transients while staying within safe margins. The BOOST pin tolerates up to 55V, but only when referenced correctly to SW.
How does the LT3976EMSE#TRPBF achieve 3.3µA quiescent current in Burst Mode?
The LT3976EMSE#TRPBF achieves 3.3µA IQ by fully disabling non-essential circuitry-including oscillator, error amplifier, and gate drivers-during sleep intervals between current pulses. This occurs only when the SYNC pin is grounded and load current drops below ~150mA. The 1.8µA SS pin pull-up remains active, but total supply current drops to 3.3µA at no load with VIN = 12V → 3.3V.
Can the LT3976EMSE#TRPBF operate with an output voltage lower than 1.2V?
No-the LT3976EMSE#TRPBF's feedback reference is fixed at 1.197V, and the minimum practical output is constrained by resistor divider accuracy and noise sensitivity. While external resistive scaling could theoretically yield sub-1.2V outputs, datasheet specifications and guaranteed performance begin at 1.2V. For true sub-1V regulation, consider the LT8610 or LT8640S families.
What is the purpose of the OUT pin on the LT3976EMSE#TRPBF, and how should it be connected?
The OUT pin on the LT3976EMSE#TRPBF serves two roles: (1) it connects to the anode of the internal boost Schottky diode, and (2) it feeds the dropout comparator that enforces 500mV minimum (VIN – VOUT). It must be connected directly to the output node when VOUT ≤ 16V. This connection enables both dropout regulation and bias sourcing from VOUT when >3.2V, improving efficiency.
Does the LT3976EMSE#TRPBF require an external catch diode?
No-the LT3976EMSE#TRPBF integrates a Schottky diode on-die connected between the OUT and SW pins. This eliminates the need for an external catch diode in standard buck configurations. However, layout best practices still require proper BOOST capacitor placement and SW-node snubbing (2Ω + 470pF) to manage EMI and voltage spikes.
LT3976EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.3V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.197V
- Voltage - Output (Max):
- 38.8V
- Current - Output:
- 5A
- Frequency - Switching:
- 200kHz ~ 2.25MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3976EMSE#TRPBF FAQ
1.How can I place an order for LT3976EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3976EMSE#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 LT3976EMSE#TRPBF reliable?
The price and inventory of LT3976EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3976EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3976EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3976EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3976EMSE#TRPBF?
LT3976EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3976EMSE#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 LT3976EMSE#TRPBF?
For technical support, including LT3976EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3976EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3976EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3976EMSE#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 LT3976EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3976EMSE#TRPBF?
All LT3976EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3976EMSE#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 LT3976EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3976EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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