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Analog Devices Inc. LT1976IFE#TRPBF
- Part No.:
- LT1976IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1976IFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,303
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Product details
Overview
LT1976IFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode step-down switching regulator IC designed for automotive and industrial power conversion. It operates from 3.3V to 60V input, delivers up to 1.5A peak switch current, features 100μA quiescent current in Burst Mode, and integrates a 0.2Ω NPN power switch in a thermally enhanced 16-pin TSSOP package with exposed pad. It is used in 14V/42V automotive systems requiring load dump protection and stable regulation under wide VIN transients.
For engineers reviewing the LT1976IFE#TRPBF datasheet, LT1976IFE#TRPBF pinout, LT1976IFE#TRPBF application, or LT1976IFE#TRPBF equivalent, key selection criteria include its 200kHz fixed-frequency operation, programmable Power Good flag, soft-start via CSS pin, 1.25V feedback reference, and thermal shutdown protection - all critical for high-reliability DC/DC designs in harsh environments.
Technical Context
The LT1976IFE#TRPBF employs current-mode control with cycle-by-cycle peak current limiting and an internal 200kHz oscillator, enabling fast transient response and stable loop compensation. Its architecture includes a dedicated BOOST pin driving an external capacitor-diode network to saturate the on-die NPN switch, achieving low conduction loss equivalent to a 0.2Ω FET.
Burst Mode operation (enabled in LT1976, disabled in LT1976B) reduces quiescent current to 100μA at light loads by disabling switching and bias circuitry, while maintaining regulation. The device supports external synchronization (230–600kHz), programmable Power Good delay via CT pin, and soft-start ramp control via CSS pin current threshold (7–20μA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 60V - supports direct connection to 42V automotive battery rails and withstands load dump transients up to 60V. |
| Peak Switch Current | 1.5A - sets maximum deliverable output current before cycle-by-cycle current limit activation. |
| Quiescent Current | 100μA (Burst Mode) - enables >1000-hour battery runtime in always-on vehicle modules with light-load standby. |
| Switch On-Resistance | 0.2Ω (typ.) - minimizes conduction loss and thermal rise in high-current 12V→3.3V/5V conversion stages. |
| Feedback Reference | 1.25V ±2.5% - defines regulated output voltage accuracy when using standard resistor dividers (e.g., 100kΩ R2). |
| Switching Frequency | 200kHz (±15%) - balances EMI performance, inductor size (e.g., 33μH typical), and efficiency across 3.3V–12V outputs. |
| Power Good Threshold | Programmable at 87–93% of VREF - allows precise output voltage monitoring with adjustable delay via external CT capacitor. |
Pinout & Package
LT1976IFE#TRPBF is housed in a 16-pin thermally enhanced TSSOP package (FE) with exposed pad (Pin 17), soldered to PCB ground for θJC(PAD) = 10°C/W. The exposed pad is electrically GND and must be connected to system ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 2) | Switch emitter node | Connects to inductor and Schottky catch diode cathode; swings from –0.3V (clamped) to VIN during operation. |
| VIN (Pin 4) | Power switch collector & primary supply | Accepts 3.3–60V input; supplies internal circuitry unless BIAS is active; requires low-inductance path to SW via input capacitor. |
| BOOST (Pin 6) | Switch drive voltage boost | Connected to external capacitor-diode network; provides >VIN voltage to fully saturate internal NPN switch. |
| CT (Pin 7) | Power Good timing control | Sources/sinks current to external capacitor; determines PG assertion delay (t = CCT × VCT / ICT) after PGFB threshold crossing. |
| GND (Pins 8, 17) | Signal & thermal reference | Pins 8 and 17 are internally tied; exposed pad (Pin 17) must be soldered to PCB ground plane for thermal management. |
| CSS (Pin 9) | Soft-start ramp control | Current threshold (7–20μA) into external capacitor sets output voltage slew rate during startup. |
| BIAS (Pin 10) | Efficiency-boosting auxiliary supply | When connected to VOUT ≥3V, powers internal circuitry from output rail-reducing VIN current and improving light-load efficiency. |
| VC (Pin 11) | Error amplifier output & current limit input | 0.45V (light load) to 2.2V (current limit); used for loop compensation, current clamping, or external override. |
| FB (Pin 12) | Output voltage sensing input | Compares divider voltage to 1.25V reference; triggers frequency foldback and soft-start if FB < 0.9V. |
| PGFB (Pin 13) | Power Good comparator input | Resistive divider from VOUT sets PG activation threshold; 87–93% of VREF ensures accurate output monitoring. |
| SYNC (Pin 14) | External clock synchronization | Accepts logic-level inputs (20–80% duty) from 230–600kHz; disables when FB < 0.9V. |
| SHDN (Pin 15) | Enable/disable control | Logic-high (>1.3V) enables regulation; logic-low reduces VIN current to <1μA for ultra-low-power standby. |
| PG (Pin 16) | Power Good open-drain output | Active-low (200μA sink) when output is in regulation; high-impedance when CT clamp is active (delayed PG assertion). |
Key Features
| Feature | Design Value |
|---|---|
| Load dump protection to 60V | Withstands ISO 7637-2 Pulse 5a transients without external TVS, reducing BOM count in automotive ECUs. |
| Burst Mode operation | Reduces no-load input current to 100μA, extending battery life in always-on telematics and ADAS modules. |
| Programmable Power Good flag | Configurable threshold (via PGFB divider) and delay (via CT capacitor) enable precise system power sequencing. |
| Thermally enhanced TSSOP-16EP | Exposed pad + θJC(PAD) = 10°C/W enables 1.5A continuous operation at TA = 85°C without heatsink. |
| Soft-start via CSS pin | Controlled output voltage ramp prevents inrush current and avoids undershoot on downstream LDOs or processors. |
Applications
| Automotive Body Control Module (BCM) | Industrial 24V-to-5V Power Supply |
|---|---|
|
Use Scenario: Regulating 14V/42V battery rail to 5V for microcontroller, CAN transceiver, and sensor interface in door module. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-controlled 5V supply with load dump immunity and Power Good signaling to MCU. Use Value: Eliminates need for external TVS and discrete power sequencing logic; 100μA quiescent current meets ISO 16750-2 parking mode requirements. |
Use Scenario: Converting 24V factory floor supply to stable 3.3V for PLC I/O controller and Ethernet PHY. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC/DC stage delivering 1.2A continuous current with programmable PG for system reset coordination. Use Value: Exposed-pad TSSOP package sustains full load at 70°C ambient; SYNC pin enables EMI reduction via spread-spectrum clock alignment. |
| Portable Test Equipment Battery Supply | Distributed Telecom Power System |
|
Use Scenario: Stepping down 36V Li-ion stack voltage to 3.3V for FPGA and ADC in handheld spectrum analyzer. IC Role / Device Role / Timing Role: Wide-input buck regulator with soft-start (CSS) and Burst Mode to preserve battery charge during idle measurement cycles. Use Value: 3.3V output stability maintained across 36V→3.3V (11:1 ratio); 0.2Ω switch resistance minimizes heat generation in sealed enclosure. |
Use Scenario: Local 48V-to-12V conversion for remote radio unit (RRU) power shelf in 5G base station. IC Role / Device Role / Timing Role: High-voltage intermediate bus converter with thermal shutdown and programmable PG for hot-swap control. Use Value: 60V absolute max rating accommodates 48V+10% telecom transients; PG flag coordinates with upstream DC-DC sequencer. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3642EMSE#PBF | 40V max input, 2A peak current, 3MHz switching, integrated MOSFETs, 2.5μA IQ | Better suited for compact, high-frequency designs where board space is constrained and 60V rating is unnecessary | Select LTC3642EMSE#PBF when footprint and EMI filtering size are critical, and input stays ≤40V. |
| LM5164QPWPRQ1 | 65V max input, 1A peak current, 100μA IQ, integrated high-side MOSFET, spread-spectrum EMI reduction | Designed specifically for automotive AEC-Q100 Grade 1; lacks programmable PG and BOOST pin architecture | Choose LM5164QPWPRQ1 for new automotive designs requiring AEC-Q100 qualification and simplified layout. |
Compared with LTC3642EMSE#PBF and LM5164QPWPRQ1, the LT1976IFE#TRPBF offers superior 60V-rated ruggedness, external BOOST control for optimized saturation, and flexible Power Good programming - making it optimal for legacy 42V automotive and industrial systems where proven reliability and design flexibility outweigh newer integration benefits.
Availability
LT1976IFE#TRPBF is available at Aetrix Electronics and suitable for automotive body electronics, industrial 24V power supplies, and portable test equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LT1976IFE#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, and communications markets.
The LT1976IFE#TRPBF belongs to Linear's high-voltage monolithic buck regulator product line, engineered for robust operation in 14V/42V automotive and wide-input industrial power systems where load dump immunity, low IQ, and thermal resilience are mandatory.
FAQ
What is the maximum input voltage rating for the LT1976IFE#TRPBF?
The LT1976IFE#TRPBF has an absolute maximum input voltage rating of 60V on the VIN pin, enabling direct use in 42V automotive systems and compatibility with ISO 7637-2 load dump transients. Operation above 60V risks permanent damage. The device maintains regulation across 3.3V to 60V, with minimum input voltage dependent on output voltage and load current per the datasheet's "Minimum Input Voltage" section.
Does the LT1976IFE#TRPBF support external synchronization, and what is its valid frequency range?
Yes, the LT1976IFE#TRPBF supports external synchronization via the SYNC pin, accepting logic-level inputs with 20–80% duty cycle across 230kHz to 600kHz. Synchronization is disabled when the FB pin voltage drops below 0.9V (e.g., during startup or fault conditions). This capability allows EMI reduction through clock alignment in multi-regulator systems.
How does the BOOST pin function in the LT1976IFE#TRPBF, and what external components are required?
The BOOST pin on the LT1976IFE#TRPBF provides a voltage higher than VIN to fully saturate the internal NPN power switch, reducing conduction loss to ~0.2Ω. It requires an external flying capacitor (typically 10nF–100nF) and Schottky diode (e.g., B1100) connected between VIN and BOOST. The BOOST pin voltage must stay within 35V above SW and ≤68V absolute to avoid damage.
What is the purpose of the CSS pin on the LT1976IFE#TRPBF, and how is it configured?
The CSS pin on the LT1976IFE#TRPBF controls soft-start by sourcing current (7–20μA) into an external capacitor connected to the output rail. The resulting voltage ramp on the capacitor limits the output voltage slew rate during startup, preventing inrush current and downstream supply sequencing issues. Soft-start is automatically defeated when FB exceeds 0.9V.
Is the LT1976IFE#TRPBF pin-compatible with the LT1976BIFE#TRPBF, and what is the key functional difference?
Yes, the LT1976IFE#TRPBF and LT1976BIFE#TRPBF share identical pinout, package, and absolute maximum ratings. The key functional difference is that the LT1976IFE#TRPBF enters Burst Mode at light loads (IQ = 100μA), while the LT1976BIFE#TRPBF uses pulse-skipping mode (IQ = 1.6mA) to eliminate low-frequency output ripple - trading efficiency for cleaner output in noise-sensitive applications.
LT1976IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm 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):
- 3.3V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 55.2V
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT1976IFE#TRPBF FAQ
1.How can I place an order for LT1976IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1976IFE#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 LT1976IFE#TRPBF reliable?
The price and inventory of LT1976IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1976IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1976IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1976IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1976IFE#TRPBF?
LT1976IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1976IFE#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 LT1976IFE#TRPBF?
For technical support, including LT1976IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1976IFE#TRPBF requirements.
6.How does Aetrix verify that LT1976IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1976IFE#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 LT1976IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1976IFE#TRPBF?
All LT1976IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1976IFE#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 LT1976IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT1976IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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