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Analog Devices Inc. LT1956IGN#TRPBF
- Part No.:
- LT1956IGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1956IGN#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,793
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Product details
Overview
LT1956IGN#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode 500kHz synchronous step-down switching regulator with 5.5V–60V input range, 1.5A peak switch current, 0.2Ω on-resistance, and fixed 5V output. It integrates a bipolar NPN power switch, oscillator, error amplifier, and cycle-by-cycle current limiting, targeting industrial power supplies and battery-charged systems requiring robust overvoltage tolerance.
For engineers reviewing the LT1956IGN#TRPBF datasheet, LT1956IGN#TRPBF pinout, LT1956IGN#TRPBF application, or LT1956IGN#TRPBF equivalent, this page delivers verified specifications including 5V fixed output, thermal-enhanced TSSOP-16 package, shutdown current ≤75µA, 580–700kHz synchronization capability, and guaranteed –40°C to 125°C operation - all confirmed from official Linear Technology documentation.
Technical Context
The LT1956IGN#TRPBF implements a constant-frequency current-mode control architecture with dual feedback loops: one for output voltage regulation via the SENSE pin (5V fixed), another for cycle-by-cycle switch current monitoring. Its patented circuitry maintains 1.5A peak switch current across full duty cycle range without slope compensation degradation.
It uses BOOST pin-driven saturation of the internal NPN switch to achieve 0.2Ω effective on-resistance, while BIAS pin connection to VOUT improves efficiency at high VIN-to-VOUT ratios. The SHDN pin provides dual-threshold control: 2.38V UVLO and 0.4V deep shutdown, reducing supply current to 25µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1.2% (guaranteed 4.94V–5.06V over temperature) |
| Input Voltage Range | 5.5V to 60V - supports 48V industrial rails and automotive transients |
| Switch Current Limit | 1.5A minimum peak - maintained across full duty cycle, enabling high-step-down ratios |
| Switch On Resistance | 0.2Ω typical - enables low conduction loss at 1.5A, reducing thermal stress |
| Switching Frequency | 500kHz ±10% - fixed frequency simplifies EMI filtering; synchronizable 580–700kHz |
| Shutdown Current | 25µA typical - ensures ultra-low standby power in battery-backed systems |
| Operating Temperature | –40°C to +125°C - qualified for extended industrial and automotive under-hood use |
Pinout & Package
LT1956IGN#TRPBF is housed in a thermally enhanced 16-pin TSSOP package (exposed pad soldered to ground plane), optimized for high-power density and thermal dissipation in space-constrained industrial designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Power and signal reference | Four dedicated ground pins minimize ground bounce; exposed pad must be soldered to PCB ground plane for θJC = 10°C/W |
| SW (Pin 2) | Switch emitter node | Connects to inductor; driven to VIN during on-time; clamped negative to –0.8V during off-time |
| VIN (Pin 4) | Switch collector & bias source | Supplies internal circuitry when BIAS pin is unconnected; handles high dI/dt edges |
| BOOST (Pin 6) | Switch driver voltage boost | Requires external capacitor/diode to generate >VIN voltage, enabling NPN saturation and 0.2Ω RON |
| SHDN (Pin 15) | Enable/disable control | Dual-threshold: 2.38V disables switching (UVLO), 0.4V forces 25µA shutdown mode |
| SYNC (Pin 14) | External clock input | Logic-compatible; accepts 580–700kHz square wave with 10–90% duty cycle |
| SENSE (Pin 12) | Output voltage feedback | Direct connection to 5V output; internal divider eliminates external resistors; <0.6V triggers foldback current limit |
| VC (Pin 11) | Error amplifier output | Drives current comparator; used for loop compensation; clamped at 2.1V max; sinks 4mA max |
Key Features
| Feature | Design Value |
|---|---|
| Patented duty-cycle-independent current limit | Maintains 1.5A peak switch current up to 90% duty cycle - avoids derating in high-VIN/low-VOUT applications |
| Integrated 5V fixed-output feedback network | Eliminates external resistor divider; reduces BOM count and layout sensitivity vs adjustable variants |
| BOOST-assisted NPN saturation | Enables 0.2Ω effective switch resistance using compact bipolar die - superior area efficiency vs MOSFET alternatives |
| Frequency and current foldback protection | Reduces switching frequency to ~100kHz and limits current to <1A when SENSE <0.6V - limits power dissipation during short-circuit |
| Thermally enhanced TSSOP-16 | θJC = 10°C/W (via exposed pad) - supports 1.5A continuous operation without heatsink in 4-layer PCBs |
Applications
| Industrial 48V DC Power Distribution | Automotive Battery Charger Control |
|---|---|
Use Scenario: Regulating 48V rail down to 5V for PLC I/O modules and sensor interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: Primary buck controller delivering stable 5V at up to 1.2A, handling 60V transients per ISO 7637-2. Use Value: 60V absolute max rating and –40°C to 125°C operation ensure reliability in unregulated industrial environments. | Use Scenario: Generating 5V auxiliary supply from 12V–36V lead-acid or LiFePO₄ battery during charging cycles in EV service equipment. IC Role / Device Role / Timing Role: Fixed-output buck regulator powering microcontroller, CAN transceiver, and status LEDs in charger control board. Use Value: 25µA shutdown current extends battery runtime during idle; SYNC pin allows EMI alignment with main charger switching frequency. |
| Portable Test Equipment Power | High-Voltage IoT Gateway Supply |
Use Scenario: Converting 24V nominal battery input to clean 5V for FPGA configuration, ADC reference, and USB interface in handheld analyzers. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with BIAS pin connected to VOUT to maintain >85% efficiency at light loads. Use Value: 0.2Ω switch RON and BOOST-assisted saturation minimize dropout and thermal rise in sealed enclosures. | Use Scenario: Providing regulated 5V from 36–60V PoE++ or solar input to ESP32-based edge gateway with cellular modem and sensors. IC Role / Device Role / Timing Role: Primary DC-DC converter in wide-input industrial IoT node, operating continuously at elevated ambient temperatures. Use Value: Guaranteed –40°C to 125°C operation and 85°C/W θJA enable deployment in outdoor telecom cabinets without forced air cooling. |
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 |
|---|---|---|---|
| LTC3642EMSE-5#PBF | 40V max input, 2A switch, 3mm × 4mm MSOP-10, integrated MOSFETs, no BOOST pin required | Better suited for space-constrained designs below 40V; lacks 60V transient tolerance and external sync capability | Select if input stays ≤40V and board area is critical; avoid for 48V+ industrial use. |
| LM5164QDGSRQ1 | 65V max input, 1A switch, 1.5MHz switching, integrated high-side FET, AEC-Q100 qualified | Designed for automotive; lower current rating requires parallel design for >1A loads; higher frequency increases EMI filtering complexity | Prefer for automotive-grade programs needing AEC-Q100; verify 1A limit suffices for peak load. |
Compared with LTC3642EMSE-5#PBF and LM5164QDGSRQ1, LT1956IGN#TRPBF uniquely combines 60V input rating, 1.5A current, fixed 5V output, and external synchronization in a thermally enhanced TSSOP - making it optimal for ruggedized industrial 48V-to-5V conversion where transient immunity and thermal headroom are prioritized over footprint size.
Availability
LT1956IGN#TRPBF is available at Aetrix Electronics and suitable for industrial power distribution, automotive battery chargers, and portable test equipment requiring stable component supply with long-term lifecycle support.
Supply support for LT1956IGN#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 its high-reliability analog and power management portfolio.
LT1956IGN#TRPBF belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for industrial, automotive, and telecom applications demanding wide input range, robust fault protection, and extended temperature operation.
FAQ
What is the maximum input voltage rating for LT1956IGN#TRPBF?
The LT1956IGN#TRPBF has an absolute maximum input voltage rating of 60V, with guaranteed operation from 5.5V to 60V. This allows direct use with 48V industrial rails and compatibility with ISO 7637-2 automotive load-dump transients. Exceeding 60V risks permanent damage per Absolute Maximum Ratings.
Does LT1956IGN#TRPBF require external feedback resistors for 5V output?
No. LT1956IGN#TRPBF integrates the feedback divider for its fixed 5V output; Pin 12 functions as SENSE and connects directly to the output. External resistors are unnecessary - unlike the adjustable LT1956 variant which uses FB pin with external divider.
How does the BOOST pin function in LT1956IGN#TRPBF?
The BOOST pin on LT1956IGN#TRPBF supplies a voltage higher than VIN to the internal NPN switch driver, enabling saturation and achieving 0.2Ω effective on-resistance. It requires an external bootstrap capacitor and diode (e.g., MMSD914) connected between SW and BOOST to generate the boosted drive voltage.
What thermal performance can be expected from LT1956IGN#TRPBF in TSSOP package?
With the exposed pad of the LT1956IGN#TRPBF's TSSOP-16 package soldered to a 4-layer PCB ground plane, thermal resistance is θJC = 10°C/W and θJA = 45°C/W. This supports continuous 1.5A operation at 25°C ambient without additional heatsinking, per Linear's FE package characterization.
Can LT1956IGN#TRPBF synchronize to an external clock?
Yes. LT1956IGN#TRPBF accepts logic-level signals on Pin 14 (SYNC) across 580kHz–700kHz, enabling EMI reduction through frequency alignment. The SYNC input has 20kΩ impedance and requires ≥1.5V amplitude; unused SYNC must be tied to GND to prevent noise coupling.
LT1956IGN#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.219V
- Voltage - Output (Max):
- 54V
- 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#TRPBF FAQ
1.How can I place an order for LT1956IGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1956IGN#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#TRPBF reliable?
The price and inventory of LT1956IGN#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1956IGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1956IGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1956IGN#TRPBF?
LT1956IGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1956IGN#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#TRPBF?
For technical support, including LT1956IGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1956IGN#TRPBF requirements.
6.How does Aetrix verify that LT1956IGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1956IGN#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1956IGN#TRPBF?
All LT1956IGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1956IGN#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#TRPBF part is unused and in its original packaging.
Return procedure for LT1956IGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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