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Analog Devices Inc. LT1956IGN-5#TRPBF
- Part No.:
- LT1956IGN-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1956IGN-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1.5A 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,170
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Product details
Overview
LT1956IGN-5#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, fixed 5V-output synchronous step-down switching regulator with 5.5V–60V input range, 1.5A peak switch current, 0.2Ω on-resistance, and constant 500kHz switching frequency. It integrates a bipolar NPN power switch and current-mode control architecture for fast transient response in industrial power supplies.
For engineers reviewing the LT1956IGN-5#TRPBF datasheet, LT1956IGN-5#TRPBF pinout, LT1956IGN-5#TRPBF application, or LT1956IGN-5#TRPBF equivalent, key selection considerations include its fixed 5V SENSE interface, thermally enhanced 16-pin TSSOP package, shutdown threshold at 0.4V/2.38V, BOOST pin voltage headroom requirement, and cycle-by-cycle current limiting under short-circuit conditions.
Technical Context
The LT1956IGN-5#TRPBF employs a current-mode buck architecture with internal 500kHz oscillator, dual shutdown comparators (0.4V and 2.38V thresholds), and patented circuitry maintaining 1.5A peak switch current across full duty cycle range. Its bipolar NPN switch is driven via BOOST pin to achieve 0.2Ω effective on-resistance.
It features frequency foldback below 0.8V FB/SENSE voltage and current limit foldback below 0.6V, reducing dissipation during output short-circuit. The BIAS pin enables efficiency optimization by sourcing bias current from regulated output when VIN ≫ VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±2% (SENSE pin directly connected to VOUT; no external divider required) |
| Input Voltage Range | 5.5V to 60V - supports wide-range industrial and automotive battery inputs |
| Peak Switch Current | 1.5A minimum - maintained over full duty cycle, enabling stable operation up to ~90% DC |
| Switch On Resistance | 0.2Ω typical - achieved via BOOST-driven saturation of integrated NPN switch |
| Switching Frequency | 500kHz ±10% - constant-frequency operation with external synchronization range 580–700kHz |
| Shutdown Current | 25µA typical - ultra-low quiescent draw in micropower shutdown mode |
| Feedback Reference | 5V SENSE threshold - internal resistor divider sets regulation point; no external FB network needed |
| Thermal Package | 16-pin thermally enhanced TSSOP - θJC = 10°C/W (exposed pad soldered to ground plane) |
Pinout & Package
LT1956IGN-5#TRPBF is housed in a 16-pin thermally enhanced TSSOP package with exposed thermal pad (pin 8). The package requires soldering of the exposed pad to a PCB ground plane for thermal performance (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Power and signal reference ground | Multipoint ground connection; exposed pad (Pin 8) must be soldered to PCB ground plane for thermal management |
| SW (Pin 2) | Switch emitter node | Connects to inductor and catch diode cathode; swings from near GND to VIN during operation |
| VIN (Pin 4) | Power switch collector supply | Primary input supply for internal switch and bias circuitry; high dI/dt path requiring low-inductance layout |
| BOOST (Pin 6) | Switch driver boost supply | Must be held ≥2V above SW to ensure NPN saturation; driven by external capacitor/diode charge pump |
| BIAS (Pin 10) | Internal bias supply input | When tied to VOUT (≥3V), shifts bias current sourcing from VIN to VOUT, improving efficiency at high VIN/VOUT ratios |
| SHDN (Pin 15) | Enable/shutdown control | Logic-level input: <0.4V forces full shutdown (25µA IQ); >2.38V enables UVLO lockout function |
| SYNC (Pin 14) | Oscillator synchronization input | Accepts 10–90% duty cycle logic signal (1.5–2.2V min amplitude); synchronizes fSW from 580–700kHz |
| FB/SENSE (Pin 12) | Output voltage sense input | Fixed 5V version uses internal divider; pin connects directly to regulated 5V output for feedback and fault detection |
| VC (Pin 11) | Error amplifier output / current limit setpoint | Provides loop compensation node; also serves as current clamp point (0.9V–2.1V operating range) |
Key Features
| Feature | Design Value |
|---|---|
| Patented duty-cycle-independent current limit | Maintains 1.5A peak switch current up to 90% duty cycle - eliminates slope-compensation roll-off common in current-mode controllers |
| Integrated BOOST drive architecture | Enables bipolar NPN switch saturation (0.2Ω RON) without discrete gate driver or external FET - reduces die size vs. MOSFET-based alternatives |
| Dual-threshold SHDN pin | 0.4V shutdown and 2.38V UVLO thresholds - supports sequenced power-up and robust brown-out protection in multi-rail systems |
| Frequency and current foldback | Reduces fSW and switch current limit when SENSE voltage drops below 0.8V and 0.6V - limits power dissipation during output short-circuit |
| BIAS pin efficiency optimization | Allows internal bias circuitry to draw current from VOUT instead of VIN - improves efficiency by ~1–2% at VIN ≥24V with 5V output |
Applications
| Industrial Power Supply | Automotive Battery Converter |
|---|---|
|
Use Scenario: 24V truck battery powering 5V microcontroller, CAN transceiver, and sensor interfaces in engine control unit. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering up to 1.2A load current with input transients up to 60V (load dump). Use Value: Maintains regulation during cold-crank (4.6V min VIN) and load-dump events; thermal TSSOP package sustains 125°C junction temperature. |
Use Scenario: 48V mild-hybrid vehicle subsystem supplying 5V to infotainment display controller and USB ports. IC Role / Device Role / Timing Role: High-input-voltage step-down converter with SYNC input synchronized to system clock to reduce EMI. Use Value: Fixed 5V SENSE interface eliminates resistor tolerance error; BOOST pin ensures reliable switch saturation across -40°C to 125°C. |
| Portable Medical Equipment | Distributed Telecom Power |
|
Use Scenario: Battery-powered ultrasound device using Li-ion (3.0–4.2V) + boost stage to generate 12V, then LT1956IGN-5#TRPBF to derive clean 5V for digital processing. IC Role / Device Role / Timing Role: Secondary 5V regulator accepting boosted input; operates with BIAS pin tied to 5V output for optimal light-load efficiency. Use Value: 25µA shutdown current extends battery life; current-mode control delivers <50µs transient response to processor burst loads. |
Use Scenario: 48V intermediate bus in telecom shelf powering multiple 5V point-of-load rails for FPGA I/O banks and SerDes interfaces. IC Role / Device Role / Timing Role: Compact, high-reliability 5V buck converter with exposed-pad TSSOP for conduction cooling on dense backplane PCB. Use Value: θJC = 10°C/W enables direct thermal coupling to chassis; NC pins (3,5,7,13) simplify routing in high-density layouts. |
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 with 3.1V–40V input, 1.2A max, integrated MOSFETs, 3mm × 4mm MSOP package | Lower input voltage ceiling and output current; no BOOST pin or external diode requirement | Preferred for space-constrained designs where 40V max input suffices and board area is premium |
| LM5164QDDARQ1 | Automotive-grade 5V buck with 4.5V–65V input, 1A max, integrated MOSFETs, 8-pin SO PowerPAD | Higher AEC-Q100 qualification level; lower peak current; no SENSE pin - requires external feedback resistors | Selected when ASIL-B compliance, extended temperature range (-40°C to 150°C), or automotive qualification is mandatory |
Compared with LTC3631EMSE-5#TRPBF and LM5164QDDARQ1, the LT1956IGN-5#TRPBF uniquely maintains 1.5A peak current across full duty cycle while supporting 60V input and fixed 5V SENSE interface - making it optimal for high-reliability industrial converters where input transients and load-step robustness are critical.
Availability
LT1956IGN-5#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery converters, portable medical equipment, and distributed telecom power systems requiring stable component supply with long-term lifecycle support.
Supply support for LT1956IGN-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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1956 family was designed as a high-voltage, current-mode buck regulator platform targeting rugged industrial and transportation applications where wide input range, thermal resilience, and transient robustness are essential.
FAQ
What is the maximum input voltage rating for the LT1956IGN-5#TRPBF?
The LT1956IGN-5#TRPBF has an absolute maximum input voltage (VIN) rating of 60V. Operation within the specified 5.5V–60V input range is guaranteed over the full –40°C to 125°C junction temperature range. Exceeding 60V risks permanent damage to the internal NPN switch and control circuitry.
Does the LT1956IGN-5#TRPBF require external feedback resistors to set the output voltage?
No. The LT1956IGN-5#TRPBF is the fixed 5V variant - it contains an internal resistor divider connected to the SENSE (FB) pin. The SENSE pin must be connected directly to the regulated 5V output; no external resistors are required or supported for output voltage programming.
How does the BOOST pin function in the LT1956IGN-5#TRPBF?
The BOOST pin supplies elevated drive voltage to the base of the internal NPN power switch. It must be held ≥2V above the SW pin voltage (typically via external capacitor and diode charge pump) to ensure full saturation and maintain the specified 0.2Ω on-resistance. Insufficient BOOST voltage increases conduction loss and thermal stress.
What are the two shutdown thresholds on the SHDN pin of the LT1956IGN-5#TRPBF?
The SHDN pin has two distinct thresholds: a 2.38V undervoltage lockout (UVLO) threshold that disables switching when VIN is insufficient, and a 0.4V full shutdown threshold that reduces supply current to 25µA. Both are guaranteed over –40°C to 125°C and enable precise power sequencing.
Can the LT1956IGN-5#TRPBF be synchronized to an external clock?
Yes. The SYNC pin accepts logic-level input (1.5–2.2V min amplitude, 10–90% duty cycle) to synchronize the internal 500kHz oscillator across a 580kHz–700kHz range. When unused, SYNC must be tied to GND to prevent noise coupling and erratic operation.
LT1956IGN-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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LT1956IGN-5#TRPBF FAQ
1.How can I place an order for LT1956IGN-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1956IGN-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 LT1956IGN-5#TRPBF reliable?
The price and inventory of LT1956IGN-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 LT1956IGN-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1956IGN-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1956IGN-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1956IGN-5#TRPBF?
LT1956IGN-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1956IGN-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 LT1956IGN-5#TRPBF?
For technical support, including LT1956IGN-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1956IGN-5#TRPBF requirements.
6.How does Aetrix verify that LT1956IGN-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1956IGN-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 LT1956IGN-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1956IGN-5#TRPBF?
All LT1956IGN-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1956IGN-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 LT1956IGN-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1956IGN-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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