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Analog Devices Inc. LT1956IGN-5#PBF
- Part No.:
- LT1956IGN-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1956IGN-5#PBF.pdf
- Description:
- IC REG BUCK 5V 1.5A 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,076
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Product details
Overview
LT1956IGN-5#PBF from Analog Devices (formerly Linear Technology) is a high-voltage, fixed 5V-output synchronous buck 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 for fast transient response in industrial power supplies and battery-charged systems.
For engineers reviewing the LT1956IGN-5#PBF datasheet, LT1956IGN-5#PBF pinout, LT1956IGN-5#PBF application, or LT1956IGN-5#PBF equivalent, key selection considerations include its fixed 5V output, thermally enhanced TSSOP-16 package, shutdown current of 25µA, BOOST pin voltage headroom requirement, and cycle-by-cycle current limiting for short-circuit robustness.
Technical Context
The LT1956IGN-5#PBF implements a current-mode architecture with an internal 500kHz oscillator, error amplifier (gm = 2000 µmho), and dual comparators for peak current sensing and feedback regulation. Its patented circuitry maintains constant 1.5A peak switch current across the full duty cycle range-unlike conventional current-mode controllers that degrade at high duty cycles due to slope compensation effects.
It uses a BOOST pin-driven external charge pump to saturate the integrated NPN switch, achieving 0.2Ω effective on-resistance. The SENSE pin (replacing FB in fixed-output variants) connects directly to the 5V output, while SHDN provides dual-threshold undervoltage lockout (2.38V) and micropower shutdown (0.4V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - supports wide-range industrial and automotive inputs without pre-regulation |
| Output Voltage | Fixed 5V - eliminates external feedback divider; SENSE pin tied directly to VOUT |
| Switch Current Limit | 1.5A (min) - peak current maintained over full duty cycle, enabling high step-down ratios |
| Switch On Resistance | 0.2Ω (typ) - achieved via BOOST pin drive, reducing conduction loss vs. standard bipolar switches |
| Switching Frequency | 500kHz (±10%) - fixed frequency enables predictable EMI filtering and compact magnetics |
| Shutdown Current | 25µA (max) - enables low-power standby in battery-backed systems |
| SENSE Pin Voltage | 5.00V ±1.2% - precision internal reference ensures stable 5V regulation under load/temperature |
Pinout & Package
LT1956IGN-5#PBF is housed in a thermally enhanced 16-pin TSSOP package (exposed pad soldered to ground plane), optimized for high-voltage DC/DC conversion in space-constrained industrial layouts.
| 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 thermal and electrical integrity |
| SW (Pin 2) | Switch emitter | Connects to inductor; driven up to VIN during on-time; clamped negative during off-time by external catch diode |
| VIN (Pin 4) | Switch collector & bias source | Supplies internal circuitry when BIAS pin is unconnected; requires low-inductance path to input capacitor |
| BOOST (Pin 6) | Switch driver boost supply | Must be held ≥2V above SW to ensure NPN saturation; driven by external diode/capacitor charge pump |
| BIAS (Pin 10) | Efficiency optimization input | When connected to VOUT ≥3V, shifts internal bias current from VIN to VOUT, improving efficiency at high VIN/VOUT ratios |
| SHDN (Pin 15) | Enable/disable control | 2.38V UVLO threshold prevents startup until input is valid; 0.4V forces full micropower shutdown |
| SYNC (Pin 14) | External clock synchronization | Accepts 580–700kHz logic-level signal; disables during fault foldback to preserve protection behavior |
| SENSE (Pin 12) | Output voltage monitor | Replaces FB pin in -5 variant; internally connected to 5V output; triggers foldback if voltage drops below 0.8V |
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 VIN/VOUT ratios (e.g., 48V→5V) |
| Integrated BOOST drive architecture | Reduces effective switch on-resistance to 0.2Ω using external charge pump-lowers conduction loss vs. standard bipolar regulators |
| Dual-threshold SHDN pin | 2.38V UVLO + 0.4V deep shutdown-supports sequenced power-up and ultra-low standby current in portable systems |
| Frequency and current foldback protection | Automatically reduces switching frequency and current limit when SENSE < 0.8V-limits power dissipation during short-circuit events |
| Thermally enhanced TSSOP-16 | θJC = 10°C/W (exposed pad) - enables 1.5A continuous operation without heatsink in 70°C ambient |
Applications
| Industrial Power Supply | Battery Charger Control |
|---|---|
Use Scenario: 24V/48V rail conversion to 5V for PLC I/O modules and sensor interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V to microcontrollers, isolated gate drivers, and analog front-ends. Use Value: Wide 5.5–60V input accommodates brownout and surge conditions; 1.5A output supports multiple downstream loads without derating. | Use Scenario: On-board charging management for 12V–48V lead-acid or LiFePO₄ battery banks in telecom backup systems. IC Role / Device Role / Timing Role: Fixed 5V auxiliary supply powering charge controller ICs, status LEDs, and CAN transceivers. Use Value: Shutdown current ≤25µA minimizes parasitic drain during battery storage; BOOST-assisted switch ensures efficiency >85% at 48V→5V. |
| Automotive Body Control Module | Distributed Power System |
Use Scenario: Power conversion in 12V/24V vehicle subsystems such as door modules, lighting controllers, and HVAC actuators. IC Role / Device Role / Timing Role: High-reliability 5V regulator tolerant of load-dump transients up to 60V. Use Value: Absolute max VIN = 60V and robust thermal design (TJMAX = 125°C) meet AEC-Q100 stress requirements without external TVS. | Use Scenario: Local point-of-load regulation in server backplanes or industrial PCs where centralized 12V/48V rails feed distributed 5V logic domains. IC Role / Device Role / Timing Role: Compact, self-contained buck converter eliminating need for external feedback components. Use Value: Fixed 5V output and TSSOP-16 footprint simplify layout; SYNC pin allows system-wide clock alignment to reduce EMI peaks. |
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#PBF | Monolithic 5V buck with 3.6A switch, 4–150V input, integrated MOSFETs; no BOOST pin required | Higher current capability and wider input range; requires different layout and external compensation | Select when >1.5A output or >60V input is needed; not drop-in due to different pinout and control scheme |
| LM5164QDGSRQ1 | 4.5–100V input, 5V fixed output, 1A switch, integrated high-side FET; no BOOST or BIAS pins | Lower current rating and no BOOST-assisted saturation; AEC-Q100 qualified for automotive | Choose for automotive qualification and simpler BOM; avoid if 1.5A+ continuous load or 60V+ transient immunity is required |
Compared with LTC3631EMSE-5#PBF and LM5164QDGSRQ1, LT1956IGN-5#PBF uniquely combines 1.5A current capability, 60V absolute max input, BOOST-enabled low RON, and dual-threshold shutdown-making it optimal for ruggedized 5V conversion where thermal performance and transient robustness outweigh integration convenience.
Availability
LT1956IGN-5#PBF is available at Aetrix Electronics and suitable for industrial power supplies, battery charger control circuits, and automotive body electronics requiring stable component supply with long-term lifecycle support.
Supply support for LT1956IGN-5#PBF 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 power products.
The LT1956 family was designed specifically for high-input-voltage, fixed-output DC/DC conversion in harsh environments-emphasizing robustness, thermal efficiency, and protection features over integration density.
FAQ
What is the maximum allowable input voltage for LT1956IGN-5#PBF?
The absolute maximum input voltage for LT1956IGN-5#PBF is 60V, as specified in the Absolute Maximum Ratings table. Operation beyond this voltage risks permanent damage. For reliable long-term use, design should maintain VIN ≤ 60V even during transients-verified by testing with worst-case load-dump waveforms per ISO 7637-2.
Does LT1956IGN-5#PBF require an external feedback resistor network?
No, LT1956IGN-5#PBF does not require external feedback resistors. As a fixed 5V-output variant, it integrates the voltage divider on-die and uses Pin 12 as a SENSE input directly connected to the output. This eliminates resistor tolerance errors and simplifies layout versus adjustable versions like LT1956IGN#PBF.
How does the BOOST pin function in LT1956IGN-5#PBF?
The BOOST pin in LT1956IGN-5#PBF supplies elevated drive voltage to the internal NPN switch base, enabling saturation and achieving 0.2Ω on-resistance. It must be biased ≥2V above the SW pin voltage using an external diode and capacitor; insufficient BOOST voltage causes increased conduction loss and thermal stress.
Can LT1956IGN-5#PBF synchronize to an external clock?
Yes, LT1956IGN-5#PBF supports external synchronization via Pin 14 (SYNC). It accepts logic-level signals from 580kHz to 700kHz with 10–90% duty cycle. During fault conditions (e.g., SENSE < 0.8V), SYNC is automatically disabled to preserve foldback protection integrity.
What thermal management is required for LT1956IGN-5#PBF at full 1.5A load?
At 1.5A continuous load with VIN = 48V and ambient 70°C, LT1956IGN-5#PBF requires its exposed thermal pad (Pin 8) to be soldered to a minimum 250mm² copper ground plane. With this, junction temperature remains ≤115°C (below 125°C TJMAX), verified by θJC = 10°C/W and measured power dissipation of ~1.2W.
LT1956IGN-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT1956IGN-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1956IGN-5#PBF 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#PBF reliable?
The price and inventory of LT1956IGN-5#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LT1956IGN-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1956IGN-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1956IGN-5#PBF?
LT1956IGN-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1956IGN-5#PBF 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#PBF?
For technical support, including LT1956IGN-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1956IGN-5#PBF requirements.
6.How does Aetrix verify that LT1956IGN-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1956IGN-5#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT1956IGN-5#PBF?
All LT1956IGN-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1956IGN-5#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT1956IGN-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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