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Analog Devices Inc. LT3976IMSE#PBF
- Part No.:
- LT3976IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3976IMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,915
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Product details
Overview
LT3976IMSE#PBF from Analog Devices (formerly Linear Technology) is a monolithic 40V, 5A synchronous 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 NPN switch and boost Schottky diode. Designed for automotive cold-crank and industrial power supplies where ultra-low IQ and wide input range are critical.
For engineers reviewing the LT3976IMSE#PBF datasheet, LT3976IMSE#PBF pinout, LT3976IMSE#PBF application, or LT3976IMSE#PBF equivalent, key selection criteria include verified 3.3µA no-load supply current at 12VIN/3.3VOUT, confirmed 16-lead MSOP thermal performance (θJA = 40°C/W), guaranteed –40°C to 125°C operation, and validated soft-start, power-good flag, and programmable UVLO functionality.
Technical Context
The LT3976IMSE#PBF implements an internally compensated current-mode topology with fixed-frequency PWM and selectable Burst Mode operation-enabling seamless transition between high-efficiency light-load regulation and full-frequency PWM above ~150mA. Its internal 1.197V reference and error amplifier servo the VC node to maintain output accuracy across line and load variations.
It uses a saturating bipolar NPN main switch driven by a charge-pump boosted gate (via BOOST pin), enabling full saturation down to 500mV dropout while maintaining 75mΩ on-resistance. The device integrates thermal shutdown, current limit foldback, and a dedicated PG open-drain flag that asserts when VFB reaches 91.6% of regulation.
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) and load-dump survival up to 40V. |
| Max Output Current | 5A - sustained delivery with thermal derating per θJA = 40°C/W in MSOP package; foldback limits dissipation during short-circuit. |
| Quiescent Current | 3.3µA at 12VIN/3.3VOUT - enables >10-year battery life in always-on automotive or IoT applications. |
| Switching Frequency | 200kHz to 2MHz - set via RT resistor; synchronizable 250kHz–2MHz allows EMI compliance and inductor size optimization. |
| Feedback Reference | 1.197V ±1.2% - high-accuracy internal reference enables ±1.5% total output voltage tolerance with 1% resistors. |
| Dropout Voltage | 500mV - enforced minimum (VIN – VOUT) ensures stable regulation and boost capacitor charging during automotive dropout. |
| Output Ripple | <15mVP-P in Burst Mode - achieved without external filtering; enables noise-sensitive analog/RF subsystems. |
Pinout & Package
LT3976IMSE#PBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed pad (Pin 17) soldered to PCB ground for θJA = 40°C/W. Pin count and layout match the LT3976E/I/H-MSE family; no NC pins require termination.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback input | Regulates to 1.197V; connects to resistor divider tap; requires 10pF phase-lead cap to VOUT for stability. |
| SS (Pin 2) | Soft-start control | Internal 1.8µA pull-up charges external cap; actively discharged during shutdown/UVLO for controlled inrush. |
| OUT (Pin 3) | Boost diode anode & dropout sense | Connects to output if VOUT < 16V; supplies bias current when OUT > 3.2V; feeds dropout comparator (500mV threshold). |
| BOOST (Pin 4) | Switch drive boost rail | Accepts externally charged capacitor (typically 10nF); provides >VIN voltage to fully saturate internal NPN switch. |
| SW (Pins 5–7) | Power switch output | Three paralleled pins for low-inductance connection to inductor, catch diode, and boost cap; requires R-C snubber (2Ω + 470pF). |
| VIN (Pins 10–12) | Main power input | Supplies internal circuitry and switch; must be locally bypassed with low-ESR ceramic capacitors near all three pins. |
| EN (Pin 13) | Enable / UVLO input | Hysteretic threshold (1.02V fall, 1.08V rise); accurate programmable undervoltage lockout; draws only 700nA in shutdown. |
| RT (Pin 14) | Frequency programming | Resistor to GND sets fSW from 200kHz–2MHz; 41.2kΩ yields 1MHz; supports external clock sync via SYNC pin. |
| PG (Pin 15) | Power good flag | Open-drain output; pulls low until VFB ≥ 91.6% of target; valid only when VIN > 2V; actively pulled low in shutdown. |
| SYNC (Pin 16) | External clock input | Ground for Burst Mode; tie to external 250kHz–2MHz clock for synchronization; floating prohibited. |
| GND (Pin 17) | Power & signal ground | Exposed thermal pad; must be soldered to large PCB copper area for thermal performance and EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.3µA at no load enables multi-year operation from coin cells or automotive standby batteries. |
| Low-ripple Burst Mode | Maintains <15mVP-P output ripple while sustaining >90% efficiency at 1mA load-critical for RF and sensor circuits. |
| Integrated boost diode | On-chip Schottky eliminates external diode, reducing BOM count and board space while ensuring optimal timing and leakage control. |
| Programmable UVLO | Accurate 1.02V EN threshold with 60mV hysteresis allows precise system-level brown-out protection without external comparators. |
| Thermal robustness | Current limit foldback + thermal shutdown protect against sustained overload; exposed pad enables 40°C/W junction-to-ambient thermal resistance. |
Applications
| Automotive Battery Regulation | Industrial Power Supplies |
|---|---|
Use Scenario: Regulating 6V–16V automotive battery to 3.3V/5V for infotainment microcontrollers during cold-crank (4.3V min) and load-dump (40V max). IC Role / Device Role / Timing Role: Primary buck controller with dropout management, power-good signaling, and thermal foldback to sustain operation under extreme transients. Use Value: Eliminates need for pre-regulator stages; maintains regulation at 4.3V input with 500mV dropout and delivers 5A peak current without external MOSFETs. | Use Scenario: Providing isolated 5V/12V rails for PLC I/O modules operating continuously in 40°C–85°C ambient environments. IC Role / Device Role / Timing Role: High-reliability DC-DC converter with guaranteed –40°C to 125°C operation, soft-start sequencing, and PG flag for system health monitoring. Use Value: Reduces thermal design margin via 40°C/W θJA; avoids derating penalties through current foldback and thermal shutdown coordination. |
| Portable Medical Devices | Test & Measurement Equipment |
Use Scenario: Powering low-noise analog front-ends and ADCs in handheld ultrasound or glucose meters powered by single Li-ion cells (3.0V–4.2V) or 2xAA batteries. IC Role / Device Role / Timing Role: Efficient step-down regulator with ultralow IQ and sub-15mV ripple to preserve signal integrity and extend battery runtime. Use Value: Achieves >92% efficiency at 100µA load in Burst Mode, minimizing self-heating and enabling compact, fanless enclosures. | Use Scenario: Generating clean 3.3V/5V rails for FPGA configuration, DAC references, and precision op-amps in benchtop analyzers requiring <20mV ripple and fast transient response. IC Role / Device Role / Timing Role: Low-noise, high-transient-response buck regulator with current-mode control and soft-start to prevent inrush-induced measurement artifacts. Use Value: Delivers <5µs recovery from 1A load steps and maintains <15mV ripple even during burst transitions-ensuring measurement repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | Lower 3.6V min input; 3A max output; 2.5µA IQ; no integrated boost diode; requires external Schottky. | Better suited for 3.3V–5V input systems (e.g., USB-powered devices); not rated for 40V transients or automotive cold-crank. | Select when input stays above 3.6V and 3A output suffices; avoid for 12V/24V automotive or industrial inputs. |
| MPQ4470AGL-Z | 40V input; 5A output; 2.5µA IQ; integrated MOSFETs (no external diode needed); but only 125°C TJ rating and no PG flag. | Matches LT3976IMSE#PBF's voltage/current specs but lacks power-good signaling and has no guaranteed 125°C operation over full temp range. | Use where PG flag is unnecessary and thermal margin allows; verify startup behavior below 4.3V input. |
Compared with LTC3631EMSE#PBF and MPQ4470AGL-Z, the LT3976IMSE#PBF uniquely combines 40V capability, 5A output, 3.3µA IQ, integrated boost diode, PG flag, and –40°C to 125°C guaranteed operation-making it the only choice for automotive-critical, high-reliability 12V/24V systems requiring full-feature integration.
Availability
LT3976IMSE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and portable medical devices requiring stable component supply, long-term lifecycle support, and guaranteed temperature-grade consistency.
Supply support for LT3976IMSE#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for the LT® product line, known for high-performance analog, power, and interface ICs.
The LT3976IMSE#PBF belongs to Linear's high-voltage monolithic buck regulator family, engineered specifically for automotive, industrial, and battery-powered systems demanding ultralow quiescent current, wide input range, and robust thermal performance.
FAQ
What is the guaranteed operating temperature range for the LT3976IMSE#PBF?
The LT3976IMSE#PBF is guaranteed to operate from –40°C to 125°C junction temperature. This I-grade specification is fully tested and characterized across the full range, unlike the E-grade variant which is only guaranteed from 0°C to 125°C. The MSOP package's exposed pad must be soldered to PCB copper for thermal compliance.
How does the LT3976IMSE#PBF achieve 3.3µA quiescent current?
The LT3976IMSE#PBF achieves 3.3µA quiescent current through low-ripple Burst Mode operation, where the IC delivers discrete current pulses to the output capacitor and enters deep sleep between bursts-consuming only 1.7µA during sleep. The total measured 3.3µA includes minimal feedback divider current and Schottky diode leakage, verified at 12VIN/3.3VOUT with optimized external components.
Can the LT3976IMSE#PBF be synchronized to an external clock?
Yes, the LT3976IMSE#PBF supports external clock synchronization via the SYNC pin (Pin 16), accepting frequencies from 250kHz to 2MHz. When synchronized, it operates in pulse-skipping mode at light loads (increasing IQ to ~11µA), whereas grounding SYNC enables true low-ripple Burst Mode with 3.3µA IQ. Do not leave SYNC floating.
What is the purpose of the OUT pin on the LT3976IMSE#PBF?
The OUT pin on the LT3976IMSE#PBF serves three functions: (1) it connects to the anode of the internal boost Schottky diode, (2) it supplies bias current to the internal regulator when VOUT > 3.2V (improving efficiency), and (3) it feeds the dropout comparator that enforces a 500mV minimum (VIN – VOUT) difference. It must be connected to the output for VOUT < 16V.
Does the LT3976IMSE#PBF require an external Schottky diode?
No, the LT3976IMSE#PBF integrates a boost Schottky diode on-die-eliminating the need for an external diode. This reduces BOM count, PCB area, and layout complexity while ensuring matched timing and low reverse leakage (<2µA at 12V). An external catch diode is still required in standard buck configurations.
LT3976IMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT3976IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3976IMSE#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 LT3976IMSE#PBF reliable?
The price and inventory of LT3976IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3976IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3976IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3976IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3976IMSE#PBF?
LT3976IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3976IMSE#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 LT3976IMSE#PBF?
For technical support, including LT3976IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3976IMSE#PBF requirements.
6.How does Aetrix verify that LT3976IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3976IMSE#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 LT3976IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3976IMSE#PBF?
All LT3976IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3976IMSE#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 LT3976IMSE#PBF part is unused and in its original packaging.
Return procedure for LT3976IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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