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Analog Devices Inc. LT1956EFE-5#TRPBF
- Part No.:
- LT1956EFE-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1956EFE-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,390
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Product details
Overview
LT1956EFE-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 thermally enhanced 16-pin TSSOP package. It features 0.2Ω internal NPN switch, 5.5V–60V input range, and cycle-by-cycle current limiting-designed for industrial power conversion where input transients reach 60V and stable 5V rail generation is required.
For engineers reviewing the LT1956EFE-5#TRPBF datasheet, LT1956EFE-5#TRPBF pinout, LT1956EFE-5#TRPBF application, or LT1956EFE-5#TRPBF equivalent, this page delivers verified electrical parameters, thermal package details, real-world application contexts, and validated alternative parts with documented functional and interface differences.
Technical Context
The LT1956EFE-5#TRPBF employs current-mode control with an internal 500kHz oscillator and patented circuitry that maintains constant 1.5A peak switch current across the full duty cycle range-eliminating typical slope-compensation-induced current limit roll-off above 50% duty. Its BOOST pin enables saturation of the on-die NPN switch via external capacitor/diode, achieving ~0.2Ω effective RDS(on) behavior despite bipolar construction.
It integrates dual shutdown thresholds (0.4V for micropower shutdown, 2.38V for precise UVLO), synchronous capability (580–700kHz), and FB/SENSE pin functionality optimized for fixed 5V operation-where internal resistor divider sets regulation and SENSE voltage is 4.94–5.06V at TJ = –40°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - supports wide industrial input rails including 24V, 48V, and transient-tolerant battery systems |
| Output Voltage | Fixed 5V ±1.2% - internally trimmed SENSE reference eliminates external feedback resistors |
| Peak Switch Current | 1.5A - maintained over full duty cycle (0–90%), enabling high step-down ratios without current derating |
| Switch On Resistance | 0.2Ω typ - achieved via BOOST-assisted saturation, reducing conduction loss vs standard bipolar switches |
| Switching Frequency | 500kHz ±10% - fixed frequency simplifies EMI filtering; externally synchronizable to 580–700kHz |
| Quiescent Supply Current | 2.5mA - measured at VIN with BIAS = 5V; total input-referred current drops to ~2.4mA at VIN=15V/VOUT=5V |
| Shutdown Current | 25µA max - enables low-power standby in battery-backed systems |
| Operating Junction Temp | –40°C to 125°C - rated for harsh industrial and automotive under-hood environments |
Pinout & Package
LT1956EFE-5#TRPBF uses a 16-lead plastic TSSOP package with exposed thermal pad soldered to ground plane (θJA = 45°C/W, θJC = 10°C/W). Pin 1 is top-left corner when notch is oriented up; pins 1, 8, 9, 16 are GND for low-impedance return path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 8, 9, 16) | Power and signal reference | Must be connected to low-inductance ground plane; exposed pad requires full-solder coverage for thermal performance |
| SW (2) | Switch emitter node | Drives external inductor; swings from near 0V to VIN during operation; clamped to –0.8V max |
| VIN (4) | Switch collector supply | Powers internal bias circuitry; high dI/dt node requiring short, low-inductance path to input capacitor |
| BOOST (6) | Switch driver boost supply | Connected to SW via external diode/capacitor; provides >VIN voltage to saturate NPN switch |
| SHDN (15) | Enable/disable control | 2.38V UVLO threshold and 0.4V deep-shutdown threshold; open-circuit defaults to enabled |
| SYNC (14) | External clock input | Logic-compatible (1.5–2.2V min amplitude); accepts 580–700kHz square wave for EMI reduction |
| FB/SENSE (12) | Output voltage sense | Fixed 5V mode: connects directly to VOUT; senses 4.94–5.06V; enables foldback protection below 0.8V |
| VC (11) | Error amplifier output | Used for loop compensation; also serves as current clamp point; 1V–2V swing under load |
| BIAS (10) | Efficiency-boost supply | Connect to VOUT ≥3V to source internal bias current from output, improving efficiency at high VIN |
Key Features
| Feature | Design Value |
|---|---|
| Patented duty-cycle-independent current limit | Maintains 1.5A peak switch current up to 90% duty cycle-enables reliable operation at high step-down ratios (e.g., 48V→5V) |
| BOOST-assisted NPN saturation | Reduces effective switch loss to 0.2Ω level-achieves FET-like conduction efficiency with smaller die area than MOSFET alternatives |
| Dual-threshold SHDN pin | 2.38V UVLO prevents startup until input stabilizes; 0.4V deep-shutdown reduces IQ to 25µA for battery longevity |
| Frequency foldback under fault | Switching frequency drops ~5:1 when SENSE < 0.8V-limits power dissipation during short-circuit or start-up overload |
| Current-limit foldback under fault | Switch current limit reduces below 0.6V SENSE-prevents thermal runaway while preserving external diode/inductor reliability |
| Thermally enhanced TSSOP | Exposed pad + four corner GND pins yield θJA = 45°C/W-supports 1.5A continuous output without heatsink in 4-layer PCB |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: 24V vehicle battery powers 5V microcontroller, CAN transceiver, and sensor interfaces in body electronics. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering regulated rail with 60V transient tolerance per ISO 7637-2 Pulse 5a. Use Value: Maintains regulation during cold-crank (down to 6V) and load-dump (up to 60V), eliminating need for pre-regulator stage. | Use Scenario: DIN-rail mounted programmable logic controller (PLC) converts 48V DC field bus to isolated 5V logic supply. IC Role / Device Role / Timing Role: Non-isolated 5V intermediate bus converter feeding downstream DC-DC modules. Use Value: 5.5V–60V input range accommodates brownout and surge conditions common in factory automation wiring. |
| Battery Charger Auxiliary Rail | Distributed Telecom Power |
Use Scenario: Lithium-ion battery charger IC requires clean 5V auxiliary supply derived from variable 9–36V adapter input. IC Role / Device Role / Timing Role: Fixed-output buck regulator powering charger management MCU and display backlight driver. Use Value: 500kHz fixed frequency allows compact LC filter design; BIAS pin connection to 5V output improves light-load efficiency by >15% vs VIN-powered bias. | Use Scenario: 48V telecom shelf supplies multiple 5V point-of-load rails for FPGA, memory, and PHY ICs. IC Role / Device Role / Timing Role: High-efficiency, synchronized buck converter operating in parallel with other channels. Use Value: SYNC pin enables phase interleaving across multiple LT1956EFE-5#TRPBF units-reducing input ripple current and bulk capacitor stress. |
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 |
|---|---|---|---|
| LTC3631EMSE-5#TRPBF | Monolithic 5V buck; 3.6V–75V input; 1.2A max; integrated MOSFET; no BOOST pin required | Lower current rating; no external BOOST diode/cap needed; higher light-load efficiency via Burst Mode | Select when input exceeds 60V or board space prohibits BOOST components; avoid if 1.5A peak current is mandatory |
| LM5164QPWPRQ1 | Automotive-grade buck; 3.5V–65V input; 1A max; integrated MOSFET; 500kHz sync capable | AEC-Q100 qualified; lower peak current; no duty-cycle-independent current limit patent | Select for automotive production requiring PPAP documentation; not suitable for >1A continuous loads or 48V→5V at full 1.5A |
Compared with LTC3631EMSE-5#TRPBF and LM5164QPWPRQ1, LT1956EFE-5#TRPBF uniquely sustains 1.5A peak current across all duty cycles and leverages BOOST architecture for superior conduction efficiency at high VIN, making it optimal for industrial 48V→5V conversion where transient robustness and current headroom are critical.
Availability
LT1956EFE-5#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, battery charger auxiliary rails, and distributed telecom power systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT1956EFE-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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1956/LT1956-5 product line was developed by Linear Technology specifically for high-input-voltage industrial and automotive DC-DC conversion, emphasizing transient robustness, thermal efficiency, and simplified layout in constrained spaces.
FAQ
What is the maximum input voltage rating for LT1956EFE-5#TRPBF?
The absolute maximum input voltage for LT1956EFE-5#TRPBF is 60V, with guaranteed operation from 5.5V to 60V. Transient tolerance extends to 60V per specification, and the device includes internal protection against input surges-making LT1956EFE-5#TRPBF suitable for 48V industrial buses and automotive load-dump scenarios without external clamping.
Does LT1956EFE-5#TRPBF require external components for BOOST functionality?
Yes, LT1956EFE-5#TRPBF requires an external diode and capacitor connected between BOOST and SW pins to generate the boosted gate drive voltage. This configuration is mandatory to achieve the specified 0.2Ω switch on-resistance and full 1.5A peak current capability-omitting these components results in degraded efficiency and potential current limit violation.
Can LT1956EFE-5#TRPBF be synchronized to an external clock?
Yes, LT1956EFE-5#TRPBF supports external synchronization via the SYNC pin (Pin 14), accepting logic-level inputs from 580kHz to 700kHz with 10–90% duty cycle. This feature enables EMI reduction through frequency alignment and phase interleaving in multi-rail systems-critical for noise-sensitive applications like medical instrumentation or precision data acquisition where LT1956EFE-5#TRPBF is deployed.
What is the purpose of the BIAS pin on LT1956EFE-5#TRPBF?
The BIAS pin (Pin 10) on LT1956EFE-5#TRPBF allows internal bias circuitry to draw operating current from the regulated 5V output instead of VIN when connected to VOUT ≥3V. This architecture reduces total input-referred quiescent current-improving light-load efficiency by up to 15% in high-VIN applications such as 48V-to-5V conversion, a key advantage of LT1956EFE-5#TRPBF over non-BIAS-capable regulators.
How does LT1956EFE-5#TRPBF handle short-circuit conditions?
LT1956EFE-5#TRPBF implements dual-foldback protection: when SENSE voltage falls below 0.8V, switching frequency reduces ~5:1; below 0.6V, peak switch current limit folds back from 1.5A to <1A. This coordinated response limits power dissipation in the IC, external diode, and inductor-ensuring safe operation during sustained short circuits without thermal shutdown, a core safety feature of LT1956EFE-5#TRPBF.
LT1956EFE-5#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:
- 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-TSSOP-EP
LT1956EFE-5#TRPBF FAQ
1.How can I place an order for LT1956EFE-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1956EFE-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 LT1956EFE-5#TRPBF reliable?
The price and inventory of LT1956EFE-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 LT1956EFE-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1956EFE-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1956EFE-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1956EFE-5#TRPBF?
LT1956EFE-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1956EFE-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 LT1956EFE-5#TRPBF?
For technical support, including LT1956EFE-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1956EFE-5#TRPBF requirements.
6.How does Aetrix verify that LT1956EFE-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1956EFE-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 LT1956EFE-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1956EFE-5#TRPBF?
All LT1956EFE-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1956EFE-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 LT1956EFE-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1956EFE-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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