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Analog Devices Inc. LT1956EGN-5#TRPBF
- Part No.:
- LT1956EGN-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1956EGN-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1.5A 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:9,394
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Product details
Overview
LT1956EGN-5#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, fixed 5V output, 1.5A peak current, 500kHz monolithic buck switching regulator in a 16-pin SSOP package. It features a 0.2Ω internal NPN switch, 5.5V–60V input range, cycle-by-cycle current limiting, and thermal shutdown protection. It is designed for industrial power conversion where wide VIN and stable 5V rail generation are required.
For engineers reviewing the LT1956EGN-5#TRPBF datasheet, LT1956EGN-5#TRPBF pinout, LT1956EGN-5#TRPBF application, or LT1956EGN-5#TRPBF equivalent, key selection criteria include its fixed 5V SENSE interface, 25µA shutdown current, BOOST-assisted saturation architecture, and compatibility with external synchronization from 580kHz to 700kHz.
Technical Context
The LT1956EGN-5#TRPBF implements a constant-frequency current-mode control architecture with an internal 500kHz oscillator and dual comparators for peak current sensing and error amplification. Its patented circuitry maintains 1.5A peak switch current across the full duty cycle range without slope compensation degradation.
It uses a BOOST pin-driven saturating NPN switch (0.2Ω typical RCE(SAT)) and integrates a 2.9V internal bias regulator that can be powered from either VIN or the BIAS pin (connected to VOUT ≥3V), enabling higher efficiency at elevated input voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±2% (SENSE pin tied directly to VOUT; no external divider required) |
| Input Voltage Range | 5.5V to 60V - supports wide industrial and automotive battery-fed inputs |
| Switch Current Limit | 1.5A peak - maintained over full duty cycle, enabling high step-down ratios |
| Switch On Resistance | 0.2Ω typical - enables low conduction loss and high efficiency at 1.5A |
| Switching Frequency | 500kHz ±10% - fixed frequency simplifies EMI filtering and output capacitor selection |
| Shutdown Current | 25µA max - enables ultra-low-power standby in battery systems |
| Feedback Reference | Internal 4.94V–5.06V SENSE threshold - defines regulated 5V output with tight tolerance |
Pinout & Package
LT1956EGN-5#TRPBF is housed in a 16-lead plastic SSOP (Shrink Small Outline Package) with exposed ground pins (1, 8, 9, 16) for thermal and electrical integrity. The package is lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 8, 9, 16) | Power and signal reference ground | Four dedicated ground connections minimize ground bounce and improve load regulation; must be connected to low-impedance PCB ground plane |
| SW (2) | Switch emitter node | Drives external inductor; swings from near GND to VIN during operation; requires low-inductance path to catch diode and input capacitor |
| VIN (4) | Input supply and switch collector | Supplies internal bias circuitry and powers NPN switch collector; handles high dI/dt transients |
| BOOST (6) | Switch driver boost voltage | Accepts external capacitor-diode charge pump to raise drive voltage above VIN, ensuring NPN saturation and low RCE(SAT) |
| SHDN (15) | Enable/disable control | Logic-compatible input: >2.38V enables regulation; <0.4V forces micropower shutdown (25µA) |
| SYNC (14) | External clock synchronization | Accepts 580–700kHz logic-level signal to align switching frequency; tied to GND if unused |
| SENSE (12) | 5V output voltage feedback | Internally connected to 5V output; monitors VOUT directly - no external resistor divider needed |
| VC (11) | Error amplifier output / current limit setpoint | Provides loop compensation node; also serves as current clamp point (0.9V–2.1V operating range) |
| BIAS (10) | Efficiency-boosting auxiliary supply | When tied to VOUT (≥3V), shifts internal bias current from VIN to VOUT, improving efficiency at high VIN/VOUT ratios |
Key Features
| Feature | Design Value |
|---|---|
| Patented duty-cycle-independent current limit | Maintains 1.5A peak switch current up to 90% duty cycle - eliminates derating in high-VIN/low-VOUT applications |
| BOOST-assisted NPN saturation | Reduces effective switch resistance to 0.2Ω - achieves FET-like conduction loss with bipolar process cost and ruggedness |
| Two-threshold SHDN pin | 2.38V UVLO + 0.4V deep shutdown - enables precise input voltage sequencing and zero-quiescent standby |
| Frequency foldback under fault | Switching frequency drops ~5:1 when SENSE < 0.8V - limits power dissipation during short-circuit or start-up overload |
| Integrated current-mode control | Eliminates need for external slope compensation - simplifies design while preserving stability across wide load and line ranges |
Applications
| Industrial Power Supplies | Automotive Battery Systems |
|---|---|
Use Scenario: Generating a stable 5V rail from a 12V–48V industrial bus for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary non-isolated DC-DC buck converter delivering regulated 5V at up to 1.5A continuous load. Use Value: Wide 5.5V–60V input range accommodates brownouts and transients; 25µA shutdown supports remote monitoring sleep modes. | Use Scenario: Powering infotainment head-unit microcontrollers and CAN transceivers from a 12V vehicle battery with load dump immunity. IC Role / Device Role / Timing Role: High-reliability 5V point-of-load regulator with integrated UVLO and thermal protection. Use Value: 60V absolute maximum input withstands ISO 7637-2 pulse 5a (load dump); BOOST architecture ensures consistent efficiency across cold-crank (6.5V) to alternator (16V) conditions. |
| Battery Chargers | Distributed Power Architectures |
Use Scenario: Providing auxiliary 5V bias for charging ICs and status LEDs in multi-cell Li-ion battery packs (12V–36V nominal). IC Role / Device Role / Timing Role: Secondary buck regulator supplying isolated gate drivers and analog front-ends in charger management subsystems. Use Value: Fixed 5V SENSE interface eliminates trimming resistors; 1.5A capability supports parallel LED strings and USB-PD controller bias. | Use Scenario: Local 5V regulation for FPGA configuration, memory, and peripheral rails in telecom base station backplanes. IC Role / Device Role / Timing Role: Distributed buck converter on intermediate bus (e.g., 12V or 24V) feeding downstream digital loads. Use Value: 500kHz fixed frequency enables predictable EMI filter design; SYNC pin allows system-wide clock alignment to reduce beat frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3632EMSE-5#TRPBF | 40V max VIN, 1.2A output, integrated MOSFETs, 3mm × 4mm MSOP | Lower voltage/current rating; optimized for compact space-constrained designs | Select when board area is critical and input stays ≤40V; not suitable for 60V transients. |
| LM5164QDDARQ1 | 65V max VIN, 1A output, adjustable frequency (200kHz–2.2MHz), AEC-Q100 qualified | Automotive-grade qualification; lower current rating; requires external feedback divider | Select for automotive production requiring AEC-Q100; use only if 1A output suffices and 5V must be set externally. |
Compared with LTC3632EMSE-5#TRPBF and LM5164QDDARQ1, the LT1956EGN-5#TRPBF uniquely delivers 1.5A at 5V with 60V input tolerance in an SSOP package - making it optimal for industrial 5V rails where transient robustness and current headroom outweigh footprint constraints.
Availability
LT1956EGN-5#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery systems, and distributed power architectures requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1956EGN-5#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 technical and manufacturing continuity for legacy Linear products including the LT1956 family.
The LT1956 series was designed specifically for high-input-voltage industrial and automotive DC-DC conversion, emphasizing ruggedness, wide VIN operation, and fixed-output simplicity without sacrificing current capability or thermal performance.
FAQ
What is the maximum input voltage rating for the LT1956EGN-5#TRPBF?
The LT1956EGN-5#TRPBF has an absolute maximum input voltage of 60V on the VIN pin. Its operational input range is specified from 5.5V to 60V, enabling reliable use in 48V industrial buses and automotive systems subject to load dump transients. Exceeding 60V risks permanent damage per Absolute Maximum Ratings.
Does the LT1956EGN-5#TRPBF require external feedback resistors to set the 5V output?
No. The LT1956EGN-5#TRPBF integrates internal feedback resistors for a fixed 5V output. Its SENSE pin (Pin 12) connects directly to the output, eliminating the need for external dividers. This simplifies layout, improves accuracy, and reduces component count compared to adjustable versions like the LT1956EGN.
How does the BOOST pin function in the LT1956EGN-5#TRPBF?
The BOOST pin on the LT1956EGN-5#TRPBF accepts a charge-pump voltage (typically VIN + 5V via external diode and capacitor) to drive the base of the internal NPN switch. This ensures full saturation, achieving a low 0.2Ω effective on-resistance and minimizing conduction losses - a key enabler of high efficiency across the 5.5V–60V input range.
Can the LT1956EGN-5#TRPBF be synchronized to an external clock?
Yes. The LT1956EGN-5#TRPBF supports external synchronization via its SYNC pin (Pin 14). It accepts logic-level signals from 580kHz to 700kHz with 10%–90% duty cycle. When unused, SYNC must be tied to GND. This feature allows EMI reduction through frequency alignment in multi-regulator systems.
What is the shutdown current specification for the LT1956EGN-5#TRPBF?
The LT1956EGN-5#TRPBF draws a maximum of 25µA supply current when the SHDN pin is pulled below 0.4V. This micropower shutdown state is guaranteed over temperature and enables ultra-low-power standby in battery-backed or energy-harvesting applications without compromising startup reliability.
LT1956EGN-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LT1956EGN-5#TRPBF FAQ
1.How can I place an order for LT1956EGN-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1956EGN-5#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 LT1956EGN-5#TRPBF reliable?
The price and inventory of LT1956EGN-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1956EGN-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1956EGN-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1956EGN-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1956EGN-5#TRPBF?
LT1956EGN-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1956EGN-5#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 LT1956EGN-5#TRPBF?
For technical support, including LT1956EGN-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1956EGN-5#TRPBF requirements.
6.How does Aetrix verify that LT1956EGN-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1956EGN-5#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 LT1956EGN-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1956EGN-5#TRPBF?
All LT1956EGN-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1956EGN-5#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 LT1956EGN-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1956EGN-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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