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Analog Devices Inc. LT3976HMSE#TRPBF
- Part No.:
- LT3976HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3976HMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,249
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Product details
Overview
LT3976HMSE#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, 40V input, 5A monolithic step-down switching regulator with ultralow 3.3µA quiescent current in Burst Mode operation, 2MHz adjustable switching frequency, and integrated 75mΩ bipolar NPN switch - designed for automotive cold-crank and industrial power supply applications where wide VIN range and low standby power are critical.
For engineers reviewing the LT3976HMSE#TRPBF datasheet, LT3976HMSE#TRPBF pinout, LT3976HMSE#TRPBF application, or LT3976HMSE#TRPBF equivalent, this page delivers verified technical context, validated package mapping to 16-lead MSOP with exposed GND pad, confirmed thermal rating (–40°C to 150°C), and real-world design implications of its 500mV dropout, programmable UVLO, and soft-start override during current limit foldback.
Technical Context
The LT3976HMSE#TRPBF implements a current-mode control architecture with internal compensation, enabling fast transient response and stable loop behavior across 200kHz–2MHz operation. Its bipolar NPN switch-driven via an external BOOST capacitor-achieves full saturation at high duty cycles and maintains 75mΩ on-resistance while delivering up to 5A continuous output current.
It integrates a 1.197V reference error amplifier, accurate 1.02V EN threshold with 60mV hysteresis, open-drain PG flag triggered at 91.6% of regulated VOUT, and thermal shutdown protection. The device enters low-ripple Burst Mode below ~150mA load, reducing no-load IQ to 3.3µA while holding output ripple under 15mVP-P in typical configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.3V to 40V - supports automotive battery transients including cold-crank down to 4.3V without dropout failure. |
| Output Current | Up to 5A - sustained delivery enabled by thermally enhanced MSOP package (θJA = 40°C/W) and current limit foldback. |
| Quiescent Current | 3.3µA at no load - enables >10-year battery life in always-on automotive or IoT sensor nodes. |
| Switching Frequency | 200kHz to 2MHz - adjustable via RT resistor; higher frequencies allow smaller magnetics but require careful minimum on-time validation. |
| Feedback Reference | 1.197V ±1.2% - sets output accuracy; line regulation <0.01%/V ensures stability across wide VIN range. |
| Dropout Voltage | 500mV - enforced by internal comparator; maintains regulation when VIN drops near VOUT (e.g., 8.3V → 7.8V). |
| Power Good Threshold | 91.6% of VOUT - provides reliable startup sequencing signal with 8.4% hysteresis for noise immunity. |
Pinout & Package
LT3976HMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed GND pad (Pin 17), requiring PCB soldering for optimal thermal performance (θJA = 40°C/W). The package supports –40°C to +150°C junction operation and is RoHS-compliant with lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback input | Regulates output by sensing divider voltage; referenced to precise 1.197V internal bandgap. |
| SS (Pin 2) | Soft-start control | Internal 1.8µA current source ramps peak switch current; actively discharged during shutdown. |
| OUT (Pin 3) | Boost diode anode / dropout sense | Connects to output node ≤16V; supplies bias when VOUT >3.2V; enables 500mV dropout enforcement. |
| BOOST (Pin 4) | Switch driver boost supply | Accepts externally charged capacitor to drive NPN base above VIN for full saturation. |
| SW (Pins 5–7) | Switch node | High-current output of internal bipolar NPN; connects to inductor, catch diode, and BOOST cap. |
| VIN (Pins 10–12) | Main power input | Distributes 4.3V–40V supply to internal circuitry and switch; requires local ceramic bypassing. |
| EN (Pin 13) | Enable control | Hysteretic 1.02V/1.08V threshold enables programmable UVLO; draws only 700nA in shutdown. |
| RT (Pin 14) | Frequency programming | Resistor-to-GND sets fSW from 200kHz–2MHz; tolerance directly impacts frequency accuracy. |
| PG (Pin 15) | Power good flag | Open-drain output signals VOUT ≥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 pulse-skipping synchronization. |
| GND (Pin 17, Exposed Pad) | Signal & thermal ground | Must be soldered to large PCB copper area; serves as primary thermal path and reference plane. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.3µA IQ in Burst Mode enables multi-year battery operation in always-on automotive modules. |
| Low-ripple Burst Mode | Maintains <15mVP-P output ripple at light loads while minimizing sleep-mode current to 1.7µA. |
| Current limit foldback | Reduces switch current limit from 10A to 4.8A during overload, limiting power dissipation without latch-off. |
| Programmable undervoltage lockout | Accurate 1.02V EN threshold with 60mV hysteresis allows custom start-up voltage setting via resistor divider. |
| Thermal robustness | H-grade rating (–40°C to +150°C) with exposed-pad MSOP ensures reliability in under-hood automotive environments. |
Applications
| Automotive Battery Regulation | Industrial Power Supply |
|---|---|
Use Scenario: Regulating 12V/24V automotive battery rail to 3.3V or 5V for infotainment microcontrollers during cold-crank (VIN dips to 4.3V). IC Role / Device Role / Timing Role: Primary buck converter providing stable output despite extreme input transients and temperature cycling. Use Value: 500mV dropout and 150°C junction rating ensure uninterrupted operation during engine start; 3.3µA IQ extends backup battery life. | Use Scenario: Generating 5V/3A for PLC I/O modules powered from unregulated 24VDC industrial bus. IC Role / Device Role / Timing Role: High-current, wide-input DC/DC converter with integrated switch and thermal protection. Use Value: 5A capability and current foldback prevent thermal runaway during short-circuit faults; SYNC pin enables EMI-controlled clock alignment. |
| Portable Medical Sensors | Rail-to-Rail Industrial Monitoring |
Use Scenario: Powering ultra-low-power wearable ECG sensors from coin-cell batteries requiring >5-year shelf life. IC Role / Device Role / Timing Role: Always-on buck regulator operating in Burst Mode to minimize average supply current. Use Value: 3.3µA no-load IQ and <15mVP-P ripple meet stringent noise and longevity requirements for analog front-end precision. | Use Scenario: Converting 36V factory automation bus to 12V for analog signal conditioning circuits with strict EMI limits. IC Role / Device Role / Timing Role: Adjustable-frequency buck controller synchronized to system clock to avoid beat frequencies. Use Value: 2MHz max fSW enables compact 2.2µH inductors; SYNC pin allows deterministic EMI placement in narrow bands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3310S-1 | Monolithic 6A synchronous buck; 2.25V–5.5V VIN; 500kHz–5MHz fSW; 1.5µA IQ; QFN-18 package. | Lower VIN range, higher max fSW, no BOOST pin - unsuitable for 40V automotive inputs. | Select only for low-VIN, high-frequency, space-constrained designs where 40V capability is unnecessary. |
| TPS54560B | 6A buck with 3.5V–60V VIN; 115µA IQ; external MOSFETs; SOIC-8 package; no integrated BOOST diode. | Higher IQ, discrete FETs, no internal Schottky - requires more BOM count and layout effort. | Choose when input exceeds 40V or when thermal design favors external FETs with heatsinking. |
Compared with LTC3310S-1 and TPS54560B, the LT3976HMSE#TRPBF uniquely combines 40V operation, 3.3µA IQ, integrated BOOST diode, and H-grade temperature rating - making it the only option among the three qualified for under-hood automotive use with single-chip simplicity and ultra-low standby power.
Availability
LT3976HMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supply, portable medical sensors, and rail-to-rail industrial monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3976HMSE#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 continues its legacy of high-performance analog ICs, particularly in power management, precision signal conditioning, and timing solutions.
The LT3976 product line was engineered for demanding automotive and industrial DC/DC conversion - emphasizing ultralow quiescent current, wide input voltage tolerance, and robust thermal performance in compact packages.
FAQ
What is the maximum junction temperature rating for LT3976HMSE#TRPBF?
The LT3976HMSE#TRPBF is rated for operation from –40°C to +150°C junction temperature, meeting automotive H-grade specifications. This rating is validated per Linear Technology's characterization and statistical process controls, and requires proper PCB thermal design - specifically soldering the exposed GND pad to a sufficient copper area to maintain θJA ≤ 40°C/W.
Does LT3976HMSE#TRPBF support synchronization to an external clock?
Yes, LT3976HMSE#TRPBF supports external clock synchronization via the SYNC pin (Pin 16), accepting input frequencies from 250kHz to 2MHz. When driven by an external clock, the device operates in pulse-skipping mode at light loads - increasing no-load IQ to ~11µA but enabling deterministic EMI placement and system-level timing coordination.
How does the current limit foldback function in LT3976HMSE#TRPBF?
In LT3976HMSE#TRPBF, current limit foldback reduces the switch current limit from 10A (normal) to 4.8A when FB voltage falls to 0V - typically during output short-circuit. This throttles power dissipation without latching off. Foldback is overridden if SS voltage drops below 2V, ensuring full current delivery during soft-start ramp-up.
Can LT3976HMSE#TRPBF operate with input voltage below 4.3V?
No - the absolute minimum input voltage for regulation is 4.3V (per Electrical Characteristics table). Below this, internal UVLO activates and forces shutdown. During cold-crank events, the device sustains regulation down to 4.3V VIN while maintaining 500mV dropout, but will not start or regulate at lower voltages.
What is the purpose of the OUT pin on LT3976HMSE#TRPBF?
The OUT pin on LT3976HMSE#TRPBF serves three roles: (1) anode connection for the internal BOOST Schottky diode, (2) input to the dropout comparator that enforces 500mV minimum VIN–VOUT differential, and (3) bias supply path - when VOUT >3.2V, the device draws internal regulator current from OUT instead of VIN, improving efficiency.
LT3976HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3976HMSE#TRPBF FAQ
1.How can I place an order for LT3976HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3976HMSE#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 LT3976HMSE#TRPBF reliable?
The price and inventory of LT3976HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3976HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3976HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3976HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3976HMSE#TRPBF?
LT3976HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3976HMSE#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 LT3976HMSE#TRPBF?
For technical support, including LT3976HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3976HMSE#TRPBF requirements.
6.How does Aetrix verify that LT3976HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3976HMSE#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 LT3976HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3976HMSE#TRPBF?
All LT3976HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3976HMSE#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 LT3976HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3976HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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