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Analog Devices Inc. LT3976IMSE#TRPBF
- Part No.:
- LT3976IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3976IMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,078
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Product details
Overview
LT3976IMSE#TRPBF from Analog Devices (formerly Linear Technology) is a 40V, 5A monolithic step-down switching 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 switch and boost Schottky diode - designed for automotive cold-crank battery regulation and industrial power supplies.
For engineers reviewing the LT3976IMSE#TRPBF datasheet, LT3976IMSE#TRPBF pinout, LT3976IMSE#TRPBF application, or LT3976IMSE#TRPBF equivalent, key selection criteria include ultralow IQ at no load, programmable UVLO via EN pin (1.02V threshold), soft-start control via SS pin, power-good flag (PG), and thermal shutdown with current-limit foldback for short-circuit protection.
Technical Context
The LT3976IMSE#TRPBF implements an internally compensated current-mode topology with fast transient response and stable loop behavior across wide input (4.3V–40V) and output (adjustable down to 1.197V) ranges. Its bipolar NPN main switch is driven by a bootstrap circuit requiring external BOOST capacitor, enabling full saturation even during automotive dropout conditions.
Operation includes three distinct modes: full-frequency PWM above ~150mA load, low-ripple Burst Mode below that (with 1.7µA sleep current), and pulse-skipping when synchronized externally or during overload. Frequency foldback reduces switching frequency as FB voltage drops, aiding startup and overload recovery without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.3V to 40V - supports 12V/24V automotive systems and industrial rails with cold-crank margin. |
| Max Output Current | 5A - sustained delivery enabled by thermally enhanced MSOP-16 package with exposed GND pad. |
| Quiescent Current | 3.3µA at 12VIN → 3.3VOUT - enables >10-year battery life in always-on IoT sensors. |
| Switching Frequency | 200kHz to 2MHz - adjustable via RT resistor; allows optimization of inductor size vs. efficiency. |
| Feedback Reference | 1.197V ±1.2% - high-accuracy internal reference enables ±1.5% output regulation over temp and line. |
| Dropout Voltage | 500mV - maintains regulation when VIN falls below VOUT, critical for automotive cranking. |
| Power Good Flag | Open-drain PG asserts when VOUT reaches 91.6% of target - provides reliable system power sequencing signal. |
Pinout & Package
LT3976IMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package (MSE) with exposed GND pad (Pin 17), θJA = 40°C/W. The exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback input | Regulates output by sensing divider voltage; internal 1.197V reference sets VOUT = 1.197V × (1 + R1/R2). |
| SS (Pin 2) | Soft-start control | Internal 1.8µA current source ramps external capacitor to limit inrush; actively discharged during shutdown. |
| OUT (Pin 3) | Boost diode anode / dropout sense | Connects to output node; enables bias supply from VOUT if >3.2V and feeds dropout comparator (500mV threshold). |
| BOOST (Pin 4) | Bootstrap drive | Drives internal NPN switch; requires external capacitor referenced to SW to generate >VIN voltage. |
| SW (Pins 5–7) | Switch node | High-current output of internal NPN switch; connects to inductor, catch diode, and BOOST capacitor. |
| VIN (Pins 10–12) | Main power input | Supplies IC bias and switch driver; must be locally bypassed with low-ESR ceramic capacitors. |
| 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 switching frequency from 200kHz to 2MHz per RT = 51.1/(fSW)1.09 − 9.27 (kΩ, MHz). |
| 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 | Accepts 250kHz–2MHz external clock; grounding enables Burst Mode; floating prohibited. |
| GND (Pin 17) | Ground reference | Exposed thermal pad - must be soldered to PCB plane for thermal performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.3µA IQ enables multi-year operation from coin cells or energy-harvesting sources in always-on systems. |
| Low-ripple Burst Mode | Maintains <15mVP-P output ripple at light loads while sustaining >90% efficiency down to 1mA output current. |
| Integrated boost diode | On-die Schottky eliminates external diode, reducing BOM count and PCB area in compact 16-pin MSOP layout. |
| Current limit foldback | Reduces switch current limit from 10A to 4.8A during overload, limiting junction temperature rise without external circuitry. |
| Accurate programmable UVLO | EN pin with 60mV hysteresis and 1.02V threshold allows precise battery undervoltage cutoff in automotive applications. |
Applications
| Automotive Battery Regulation | Industrial Power Supply |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery (including 4V cold-crank transients) to 3.3V or 5V for infotainment MCU and CAN transceivers. IC Role / Device Role / Timing Role: Primary buck controller maintaining stable output during engine start-stop cycles and load-dump events. Use Value: 500mV dropout and 40V absolute max input ensure uninterrupted operation during cranking; 3.3µA IQ extends battery reserve time. | Use Scenario: Providing isolated 5V/3A rail from unregulated 24V factory automation bus for PLC I/O modules. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC-DC converter powering microcontrollers and analog front-ends in harsh environments. Use Value: 5A capability and thermal shutdown protect against sustained overloads; MSOP-16 footprint simplifies layout in space-constrained DIN-rail enclosures. |
| Portable Medical Sensors | IoT Edge Node Power |
Use Scenario: Powering wearable ECG monitors with rechargeable Li-ion batteries (3.0–4.2V) and ultra-low-power ADCs. IC Role / Device Role / Timing Role: Efficient step-down regulator delivering regulated 1.8V/3.3V from battery with minimal self-discharge. Use Value: 3.3µA IQ extends usable battery life beyond 12 months; Burst Mode ensures clean output without audible switching noise. | Use Scenario: Converting 12V PoE-derived supply to 3.3V for LoRaWAN gateways with deep-sleep duty cycling. IC Role / Device Role / Timing Role: Always-on power manager supplying MCU, RF transceiver, and sensor interface during active and sleep states. Use Value: PG flag synchronizes wake-up sequence; soft-start prevents inrush into large hold-up capacitors during network reconnection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#TRPBF | 42V input, 3.5A, 2.5µA IQ, synchronous rectification, 3mm × 4mm QFN | Lacks integrated boost diode; requires external high-side FET; better suited for space-constrained designs needing higher efficiency at mid-load. | Select when board area is critical and synchronous efficiency >92% at 1A is required; not drop-in due to different pinout and control scheme. |
| TPS54560QDGQRQ1 | 60V input, 5A, 14µA IQ, integrated high-side MOSFET, SOIC-8 | Higher IQ and lower max frequency (2.5MHz); no PG flag or soft-start pin; AEC-Q100 qualified but larger package. | Choose for automotive ASIL-B systems requiring qualification; avoid when ultralow IQ or precise UVLO is mandatory. |
Compared with LT8610EMSE#TRPBF and TPS54560QDGQRQ1, the LT3976IMSE#TRPBF uniquely combines 40V/5A capability, 3.3µA IQ, integrated boost diode, and PG flag in a thermally optimized MSOP-16 - making it optimal for cost-sensitive, high-reliability automotive and industrial buck applications where dropout performance and long-term standby are critical.
Availability
LT3976IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and portable medical sensors requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-lifecycle availability.
Supply support for LT3976IMSE#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 analog and power management ICs with rigorous characterization and automotive-grade reliability.
The LT3976 product line delivers high-voltage, high-current buck regulators optimized for automotive, industrial, and battery-powered systems demanding ultralow quiescent current, robust dropout behavior, and integrated power stage components.
FAQ
What is the guaranteed operating temperature range for LT3976IMSE#TRPBF?
The LT3976IMSE#TRPBF is guaranteed for operation from –40°C to +125°C junction temperature. This I-grade rating makes it suitable for under-hood automotive applications and industrial environments with elevated ambient temperatures. Thermal derating curves in the datasheet define maximum output current versus temperature and PCB copper area.
How does the LT3976IMSE#TRPBF achieve 3.3µA quiescent current?
The LT3976IMSE#TRPBF achieves 3.3µA quiescent current through low-ripple Burst Mode operation: during light loads, it delivers discrete current pulses to the output capacitor and enters deep sleep between bursts, drawing only 1.7µA. Total measured IQ of 3.3µA includes feedback divider and catch diode leakage - minimized using MΩ-level resistors and low-leakage Schottky diodes.
Can the LT3976IMSE#TRPBF operate with input voltage below 4.3V?
No - the LT3976IMSE#TRPBF has a minimum input voltage of 4.3V under normal operation (per Absolute Maximum Ratings and Electrical Characteristics). Below this, internal UVLO disables switching. During cold-crank events where VIN dips transiently below 4.3V, the part sustains regulation via dropout mode (maintaining VOUT = VIN – 500mV) until VIN recovers above the UVLO threshold.
What is the function of the OUT pin on the LT3976IMSE#TRPBF?
The OUT pin on the LT3976IMSE#TRPBF serves three roles: (1) anode connection for the internal boost Schottky diode, (2) input to the dropout comparator (enabling 500mV dropout regulation), and (3) bias supply path - when connected to VOUT > 3.2V, it powers the internal regulator instead of VIN, improving light-load efficiency. It must be connected to the output for all standard applications.
Does the LT3976IMSE#TRPBF require an external catch diode?
No - the LT3976IMSE#TRPBF integrates a Schottky diode on-die connected between the OUT and SW pins. This eliminates the need for an external catch diode, reducing BOM count, PCB area, and potential failure points. The internal diode has 730mV forward voltage at 100mA and <2µA reverse leakage at 12V, optimized for efficiency in typical buck configurations.
LT3976IMSE#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
LT3976IMSE#TRPBF FAQ
1.How can I place an order for LT3976IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3976IMSE#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 LT3976IMSE#TRPBF reliable?
The price and inventory of LT3976IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3976IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3976IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3976IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3976IMSE#TRPBF?
LT3976IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3976IMSE#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 LT3976IMSE#TRPBF?
For technical support, including LT3976IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3976IMSE#TRPBF requirements.
6.How does Aetrix verify that LT3976IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3976IMSE#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 LT3976IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3976IMSE#TRPBF?
All LT3976IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3976IMSE#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 LT3976IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3976IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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