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Analog Devices Inc. LT1976EFE#TRPBF
- Part No.:
- LT1976EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1976EFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,483
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Product details
Overview
LT1976EFE#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 LT1976EFE#TRPBF datasheet, LT1976EFE#TRPBF pinout, LT1976EFE#TRPBF application, or LT1976EFE#TRPBF equivalent, key selection criteria include its 200kHz fixed-frequency operation, programmable Power Good flag with threshold and delay, soft-start via CSS pin, 1.25V feedback reference, and compatibility with external synchronization - all critical for high-reliability DC/DC design in harsh environments.
Technical Context
The LT1976EFE#TRPBF employs current-mode control with cycle-by-cycle peak current limiting and internal slope compensation, enabling fast transient response and robust loop stability across wide input/output conditions. Its architecture includes an integrated 200kHz oscillator, error amplifier with 900 V/V gain and 400–800 μ℧ transconductance, and patented circuitry maintaining constant peak switch current over full duty cycle range (6%–92%).
It uses a BOOST-capacitor-assisted drive scheme to saturate the on-die NPN switch, achieving low 0.2Ω on-resistance while operating up to 60V input. Burst Mode operation reduces quiescent current to 100μA at light loads, and shutdown draws <1μA. The BIAS pin enables efficiency optimization by sourcing bias current from the regulated output when VIN ≫ VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 60V - supports direct connection to 42V automotive battery rails and industrial 48V systems without pre-regulation. |
| Peak Switch Current | 1.5A (min), 2.4A (typ) - enables ≥1A continuous output with margin for transient surges and inductor saturation headroom. |
| Quiescent Current | 100μA (Burst Mode, LT1976 variant) - sustains ultra-low standby power in always-on vehicle modules (e.g., CAN gateways, telematics). |
| Switch On-Resistance | 0.2Ω (typ) - minimizes conduction loss and thermal rise in high-current, high-VIN applications like engine control units. |
| Feedback Reference | 1.25V ±2.5% (–40°C to 125°C) - provides precise, temperature-stable output voltage setting with standard resistor dividers. |
| Power Good Flag | Programmable threshold (87–93% of VREF) and delay via CT capacitor - enables configurable rail sequencing and fault detection in multi-rail systems. |
| Switching Frequency | 200kHz (±15%) - balances EMI performance, inductor size, and efficiency for cost-sensitive industrial power supplies. |
Pinout & Package
LT1976EFE#TRPBF is housed in a 16-pin thermally enhanced TSSOP package (FE) with exposed pad (Pin 17), soldered to PCB ground for low θJC(PAD) = 10°C/W. Pin 17 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; carries full switching current and negative flyback voltage during off-time. |
| VIN (Pin 4) | Input supply collector | Primary power input for internal circuitry and switch collector; requires low-inductance path to input capacitor to suppress voltage spikes. |
| BOOST (Pin 6) | Switch driver boost supply | Accepts externally boosted voltage (>VIN + 3.3V) to fully saturate NPN switch and achieve 0.2Ω RCE(SAT). |
| CT (Pin 7) | Power Good timing control | Capacitor-connected node that sets PG delay time (t = CCT × VCT/ICT) after PGFB threshold crossing. |
| GND (Pins 8, 17) | Signal and thermal reference | Pins 8 and 17 are internally tied; exposed pad (Pin 17) must be soldered to large copper area for thermal management and noise immunity. |
| CSS (Pin 9) | Soft-start ramp control | Current-sourced node (7–20μA) that limits output voltage slew rate during startup to prevent inrush and overshoot. |
| BIAS (Pin 10) | Efficiency-optimized bias 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 | Provides loop compensation node and current limit setpoint; clamped at ~2.2V at peak switch current. |
| FB (Pin 12) | Output voltage sensing | Compares divided output against 1.25V reference; also triggers frequency foldback and disables SYNC below 0.9V. |
| PGFB (Pin 13) | Power Good comparator input | Resistive divider input for programmable PG threshold; rising edge initiates CT charging and PG assertion delay. |
| SYNC (Pin 14) | External clock synchronization | Accepts logic-level signals (20–80% duty) from 230kHz to 600kHz to align switching with system clocks and reduce EMI. |
| SHDN (Pin 15) | Enable/disable control | Active-high input (1.2–1.4V threshold); pulls VIN supply current <1μA in shutdown - essential for battery longevity. |
| PG (Pin 16) | Power Good open-drain output | Active-low signal (200μA sink) indicating valid output; high-impedance when CT clamp is active (PG timeout not expired). |
Key Features
| Feature | Design Value |
|---|---|
| Load Dump Protection to 60V | Withstands ISO 7637-2 Pulse 5a (load dump) transients up to 60V without external clamping - simplifies front-end protection in automotive ECUs. |
| Burst Mode Operation | Reduces no-load quiescent current to 100μA by disabling switching and bias circuitry intermittently - extends battery life in always-on modules. |
| Saturating Switch Design | 0.2Ω on-resistance achieved via BOOST-driven NPN switch - delivers higher efficiency than comparable MOSFET-based regulators at high VIN/VOUT ratios. |
| Programmable Power Good Flag | Configurable threshold (87–93% of 1.25V) and delay (via CT capacitor) enable precise rail monitoring and sequencing in multi-output systems. |
| Thermally Enhanced TSSOP | 16-pin TSSOP with exposed pad achieves θJA = 45°C/W - supports 1.5A operation at 125°C ambient without heatsink in compact layouts. |
Applications
| Automotive Body Control Module (BCM) | Industrial 24V/48V Distributed Power |
|---|---|
|
Use Scenario: Regulating 12V battery input to 3.3V/5V for microcontrollers, CAN transceivers, and sensors in door modules and lighting controllers. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, load-dump-protected DC/DC conversion with programmable Power Good for system reset coordination. Use Value: Eliminates need for external TVS and pre-regulator stages; 100μA quiescent current meets OEM sleep-mode requirements (<100μA total module draw). |
Use Scenario: Converting 48V factory bus to 12V/5V for PLC I/O modules, motor drivers, and fieldbus interfaces in harsh industrial settings. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator with thermal robustness and wide operating junction range (–40°C to 125°C). Use Value: 60V absolute max rating and 0.2Ω switch enable direct 48V-to-12V conversion with >90% efficiency at 1A, reducing component count vs. two-stage designs. |
| Telematics Control Unit (TCU) | Off-Highway Equipment Power Supply |
|
Use Scenario: Powering LTE modem, GPS receiver, and MCU in vehicle telematics units requiring always-on connectivity and cold-cranking support. IC Role / Device Role / Timing Role: Input-robust buck regulator with Burst Mode for low-power wake-up states and soft-start for clean boot sequencing. Use Value: Maintains regulation down to 3.3V input (cold crank), survives 60V transients, and enables <100μA system sleep current - critical for battery-backed operation. |
Use Scenario: Providing stable 5V/3.3V rails for displays, controllers, and communication modules in construction, agricultural, and mining equipment. IC Role / Device Role / Timing Role: High-reliability DC/DC converter rated for extended temperature range (–40°C to 125°C) and vibration-prone environments. Use Value: Exposed-pad TSSOP package ensures thermal stability under sustained 1A load in unventilated enclosures; load dump tolerance avoids field failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | 40V max input, 1.2A output, 3.5μA quiescent current, integrated MOSFETs, 3mm × 4mm MSOP | Lower input voltage range and output current; suited for space-constrained, lower-power industrial sensors | Select when board space is critical and input never exceeds 40V; not suitable for 42V automotive or 60V transients. |
| LM5164QPWPRQ1 | 65V max input, 1A output, 15μA IQ, integrated high-side MOSFET, 2.2MHz switching, SOIC-10 | Higher frequency enables smaller magnetics but increases EMI; lower peak current limits output capability | Choose for compact designs needing 2.2MHz operation and AEC-Q100 qualification; verify thermal performance at 1A continuous. |
Compared with LTC3631EMSE#PBF and LM5164QPWPRQ1, the LT1976EFE#TRPBF offers superior 60V transient tolerance, 1.5A peak current headroom, and proven Burst Mode efficiency in automotive BCM/TCU use cases - making it optimal where ruggedness and light-load IQ are prioritized over footprint or ultra-high frequency.
Availability
LT1976EFE#TRPBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial 48V distributed power systems, and telematics control units requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LT1976EFE#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, communications, and aerospace markets.
The LT1976EFE#TRPBF belongs to Linear's high-voltage monolithic buck regulator product line, engineered specifically for robust DC/DC conversion in automotive and industrial environments where input transients, thermal stress, and ultra-low quiescent current are critical design constraints.
FAQ
What is the maximum input voltage rating for the LT1976EFE#TRPBF?
The LT1976EFE#TRPBF has an absolute maximum input voltage rating of 60V on the VIN pin, and is specifically designed to withstand automotive load dump transients per ISO 7637-2 Pulse 5a. Its operational input range is 3.3V to 60V, making it suitable for direct connection to 12V, 24V, and 42V vehicle electrical systems without external clamping circuitry. This rating is confirmed across the full –40°C to 125°C junction temperature range.
Does the LT1976EFE#TRPBF support synchronization to an external clock?
Yes, the LT1976EFE#TRPBF supports external synchronization via its SYNC pin (Pin 14). It accepts logic-level inputs with 20–80% duty cycle across a 230kHz to 600kHz range, allowing alignment with system clocks to reduce EMI and avoid beat frequencies. Synchronization is disabled when the FB pin voltage falls below 0.9V - a behavior documented in the Applications Information section of the official datasheet.
How does the LT1976EFE#TRPBF achieve 100μA quiescent current?
The LT1976EFE#TRPBF achieves 100μA typical quiescent current through Burst Mode operation, which disables the internal oscillator, error amplifier, and gate driver between output voltage regulation cycles at light loads. This mode is exclusive to the LT1976 (not LT1976B) variant and is enabled automatically when output current drops below ~10mA. The datasheet specifies this value applies over the full –40°C to 125°C temperature range under defined test conditions (VIN = 12V, VOUT = 3.3V).
What is the purpose of the BOOST pin on the LT1976EFE#TRPBF?
The BOOST pin (Pin 6) on the LT1976EFE#TRPBF provides a voltage higher than VIN to fully saturate the internal NPN power switch, reducing its on-resistance to 0.2Ω (typ). It connects to an external bootstrap capacitor and Schottky diode (e.g., Diodes Inc. B1100), generating a ~3.3V boost above VIN. Without BOOST, the switch would operate in linear region with ~1.5V VCE, significantly degrading efficiency - especially at high input voltages.
Can the LT1976EFE#TRPBF be used in AEC-Q200 qualified automotive designs?
The LT1976EFE#TRPBF is specified for operation from –40°C to 125°C junction temperature and features automotive-grade reliability mechanisms including thermal shutdown, load dump protection, and robust ESD tolerance. While the part itself is not individually AEC-Q200 certified, it is widely deployed in AEC-Q200-compliant systems (e.g., body control modules) when used with appropriate layout, derating, and system-level validation - consistent with Linear Technology's automotive qualification methodology.
LT1976EFE#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT1976EFE#TRPBF FAQ
1.How can I place an order for LT1976EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1976EFE#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 LT1976EFE#TRPBF reliable?
The price and inventory of LT1976EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1976EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1976EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1976EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1976EFE#TRPBF?
LT1976EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1976EFE#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 LT1976EFE#TRPBF?
For technical support, including LT1976EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1976EFE#TRPBF requirements.
6.How does Aetrix verify that LT1976EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1976EFE#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 LT1976EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1976EFE#TRPBF?
All LT1976EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1976EFE#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 LT1976EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT1976EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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