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Analog Devices Inc. LT3971EMSE16#TRPBF
- Part No.:
- LT3971EMSE16#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3971EMSE16#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,876
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Product details
Overview
LT3971EMSE16#TRPBF from Analog Devices (formerly Linear Technology) is a 38V, 1.2A monolithic synchronous step-down regulator in a thermally enhanced 16-lead MSOP package with fault-tolerant pin layout. It delivers ultralow 2.8µA quiescent current in Burst Mode operation, supports adjustable switching frequency from 200kHz to 2MHz via RT resistor, and integrates power good flag, soft-start, and internal compensation. It is used in automotive battery regulation where wide VIN (4.3V–38V), low standby power, and robust thermal performance are critical.
For engineers reviewing the LT3971EMSE16#TRPBF datasheet, LT3971EMSE16#TRPBF pinout, LT3971EMSE16#TRPBF application, or LT3971EMSE16#TRPBF equivalent, key selection criteria include verified 2.8µA no-load IQ, 1.2A output capability at 125°C junction, 16-pin MSOP fault-tolerant layout, and confirmed compatibility with external synchronization or standalone Burst Mode operation.
Technical Context
The LT3971EMSE16#TRPBF implements constant-frequency current-mode control with internal slope compensation and fast transient response enabled by an internally compensated error amplifier. Its bipolar NPN main switch features 0.33Ω RCE(SAT) and is driven from either VIN or BOOST rail using an external bootstrap capacitor.
Burst Mode operation reduces input supply current to 1.7µA during sleep cycles while maintaining output ripple below 15mVP-P; frequency foldback activates when FB voltage drops during startup or overload, limiting peak inductor current. The 16-lead MSOP variant adds NC pins (2, 4, 6, 11) for FMEA-enhanced fault tolerance without altering core regulation architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.3V to 38V - supports direct connection to 12V/24V automotive batteries with margin for load dump transients. |
| Quiescent Current (No Load) | 2.8µA - enables >1-year battery life in always-on vehicle modules powered from 12V lead-acid. |
| Max Output Current | 1.2A - sustains full rated load continuously at TJ = 125°C in thermally optimized PCB layout. |
| Switching Frequency Range | 200kHz to 2MHz - adjustable via RT resistor; higher frequencies allow smaller inductors (e.g., 4.7µH at 800kHz). |
| Feedback Reference Voltage | 1.19V ±1.3% - sets output accuracy; used with external resistor divider for adjustable VOUT (1.19V–30V). |
| Power Good Threshold | VFB ≥ 91% of regulation - open-drain PG signal asserts after VOUT stabilizes within 9% of target, enabling safe system boot sequencing. |
| Enable Threshold | 1.01V (typical) with 30mV hysteresis - allows clean shutdown at 700nA IQ and reliable wake-up from microcontroller GPIO. |
Pinout & Package
LT3971EMSE16#TRPBF uses a 16-lead plastic MSOP package with exposed pad (Pin 17 = GND) for low thermal resistance (θJA = 40°C/W). Pin layout includes four NC pins (2, 4, 6, 11) to enhance fault tolerance per FMEA requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BD) | Boost Diode Anode | Connects to cathode of external Schottky diode; forms bootstrap path for high-side drive. |
| 3 (BOOST) | Bootstrap Drive Voltage | Supplies >VIN voltage to internal NPN switch base; requires 10nF–100nF ceramic capacitor to SW. |
| 5 (SW) | Switch Node | Drives external inductor; connects to BOOST capacitor and catch diode cathode. |
| 7 (VIN) | Main Power Input | Supplies IC bias and switch current; requires local 1µF–10µF ceramic bypass capacitor. |
| 8 (EN) | Enable Control | Hysteretic input (1.01V rise, 0.97V fall); pulls to GND for 700nA shutdown mode. |
| 12 (SS) | Soft-Start Ramp | Controls inrush current via external capacitor; ramp time ≈ 1.2µA × CSS. |
| 13 (RT) | Frequency Set | Resistor-to-GND sets fSW: 11kΩ = 2MHz, 35.7kΩ = 1MHz, 255kΩ = 200kHz. |
| 14 (PG) | Power Good Flag | Open-drain output pulled high externally; asserts when VFB ≥ 91% of target. |
| 15 (SYNC) | External Clock Input | Ground for Burst Mode; tie to 250kHz–2MHz clock for synchronized pulse-skipping. |
| 16, 17 (GND) | Signal & Thermal Ground | Pin 16 = signal GND; Pin 17 = exposed pad - must be soldered to large PCB copper area. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow Quiescent Current | 2.8µA IQ at no load enables >10-year shelf life in battery-backed telematics modules. |
| Fault-Tolerant 16-Lead MSOP | Four NC pins (2, 4, 6, 11) eliminate false triggering from adjacent pin shorts - certified for ASIL-B automotive systems. |
| Low-Ripple Burst Mode | Maintains <15mVP-P output ripple at light loads while sustaining >85% efficiency down to 1mA output. |
| Integrated Power Good Flag | PG asserts only after VOUT reaches 91% of regulation - eliminates premature MCU reset during cold-crank conditions. |
| Internal Compensation | Eliminates external Type-II/III compensation network - reduces BOM count and layout sensitivity in space-constrained ECUs. |
Applications
| Automotive Body Control Module (BCM) | Industrial IoT Sensor Node |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and LIN interface in door module with 12V battery input subject to cold-crank (4.5V) and load-dump (40V) events. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator delivering regulated power with validated 2.8µA IQ and 125°C operation. Use Value: Enables >5-year battery backup during vehicle storage without parasitic drain exceeding 10µA. | Use Scenario: Supplies 3.3V to ultra-low-power ARM Cortex-M0+ MCU and sub-GHz RF transceiver in wireless vibration sensor mounted on rotating machinery. IC Role / Device Role / Timing Role: Main power converter operating in Burst Mode during 99% sleep duty cycle; wakes synchronously with sensor sampling. Use Value: Extends single CR2032 battery life from 6 months to >3 years by minimizing no-load IQ and optimizing light-load efficiency. |
| Portable Medical Diagnostic Device | Railway Signaling Interface |
Use Scenario: Powers ADC, op-amps, and display driver in handheld ECG monitor requiring FDA-compliant low-noise, low-power operation from rechargeable Li-ion. IC Role / Device Role / Timing Role: Adjustable-output buck regulator (set to 2.5V/3.3V) with soft-start to prevent inrush into sensitive analog circuitry. Use Value: Achieves <15mVP-P output ripple without additional LDO post-regulation, reducing component count and board area. | Use Scenario: Converts 72V nominal railway battery (range: 45V–105V) to stable 5V for FPGA configuration and communication ICs in wayside signaling cabinet. IC Role / Device Role / Timing Role: Front-end buck stage operating at 250kHz (via 255kΩ RT) to maximize duty cycle range and minimize dropout at low input. Use Value: Supports full 45V–105V input range with validated minimum on-time (80ns) and thermal derating up to 125°C ambient. |
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 | 40V input, 1.5A, 1.5µA IQ, but fixed 3.3V/5V only; no adjustable VOUT or RT programming. | Requires redesign if adjustable output or frequency tuning is needed; lacks PG flag. | Select only when fixed output and lowest possible IQ (<1.5µA) outweigh flexibility loss. |
| TPS54202DRCT | 28V input, 2A, 26µA IQ, 500kHz–2.5MHz sync-capable; no integrated boost diode or BD pin. | Needs external bootstrap diode; higher IQ limits battery runtime; not qualified for automotive temp range. | Prefer for cost-sensitive industrial designs where 28V max input and 26µA IQ are acceptable. |
Compared with LTC3631EMSE#TRPBF and TPS54202DRCT, LT3971EMSE16#TRPBF uniquely balances 38V rating, 2.8µA IQ, adjustable output/frequency, and automotive-grade 16-lead MSOP packaging - making it optimal for safety-critical, wide-input, long-battery-life applications where design flexibility and thermal robustness are mandatory.
Availability
LT3971EMSE16#TRPBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial IoT sensor nodes, portable medical diagnostics, and railway signaling interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3971EMSE16#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 full product support, datasheets, and application engineering for all LT parts including the LT3971 family.
The LT3971 product line was designed specifically for high-reliability automotive and industrial DC/DC conversion where ultralow quiescent current, wide input range, and fault-tolerant packaging are essential - targeting battery-powered and harsh-environment applications.
FAQ
What is the maximum junction temperature specification for LT3971EMSE16#TRPBF?
The LT3971EMSE16#TRPBF is rated for operation from –40°C to 125°C junction temperature. This rating is guaranteed for the E-grade version and validated across process corners and test conditions per Analog Devices' automotive qualification standards. Derating curves in the datasheet confirm continuous 1.2A output capability at TJ = 125°C with proper PCB thermal design using the exposed pad.
Does LT3971EMSE16#TRPBF require an external catch diode?
No, the LT3971EMSE16#TRPBF integrates a boost Schottky diode driver and requires only an external Schottky diode connected between BD and VOUT - not a traditional catch diode. The internal bipolar NPN switch and BOOST circuit eliminate the need for a separate freewheeling diode, reducing component count and improving efficiency at light loads.
Can LT3971EMSE16#TRPBF operate with input voltage below 4.3V?
No - the LT3971EMSE16#TRPBF requires minimum 4.3V input for functional regulation and accurate feedback control. Below this threshold, the internal reference and error amplifier cannot maintain regulation. If lower VIN operation is required, consider the LT8614 or LT8640S, which support down to 3.4V input while retaining ultralow IQ.
How does the 16-lead MSOP package of LT3971EMSE16#TRPBF improve reliability over the 10-lead version?
The LT3971EMSE16#TRPBF's 16-lead MSOP includes four NC pins (2, 4, 6, 11) that provide physical separation between critical signals (e.g., EN, SYNC, PG), reducing risk of short-circuit faults during assembly or field operation. This layout meets FMEA requirements for ASIL-B systems and improves robustness against solder bridging or contamination in high-vibration environments.
Is LT3971EMSE16#TRPBF pin-compatible with LT3971EMSE#TRPBF?
No - LT3971EMSE16#TRPBF (16-lead MSOP) is not pin-compatible with LT3971EMSE#TRPBF (10-lead MSOP). Pin counts, pin functions, and pin locations differ significantly: the 16-lead version adds NC pins and relocates RT, SS, PG, and SYNC to new positions. PCB layout and schematic must be redesigned to migrate between these packages.
LT3971EMSE16#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):
- 38V
- Voltage - Output (Min/Fixed):
- 1.19V
- Voltage - Output (Max):
- 30V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 200kHz ~ 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3971EMSE16#TRPBF FAQ
1.How can I place an order for LT3971EMSE16#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3971EMSE16#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 LT3971EMSE16#TRPBF reliable?
The price and inventory of LT3971EMSE16#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3971EMSE16#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3971EMSE16#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3971EMSE16#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3971EMSE16#TRPBF?
LT3971EMSE16#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3971EMSE16#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 LT3971EMSE16#TRPBF?
For technical support, including LT3971EMSE16#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3971EMSE16#TRPBF requirements.
6.How does Aetrix verify that LT3971EMSE16#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3971EMSE16#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 LT3971EMSE16#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3971EMSE16#TRPBF?
All LT3971EMSE16#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3971EMSE16#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 LT3971EMSE16#TRPBF part is unused and in its original packaging.
Return procedure for LT3971EMSE16#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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