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Analog Devices Inc. LT1956EGN-5#PBF
- Part No.:
- LT1956EGN-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1956EGN-5#PBF.pdf
- Description:
- IC REG BUCK 5V 1.5A 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,544
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Product details
Overview
LT1956EGN-5#PBF from Analog Devices (formerly Linear Technology) is a fixed 5V, high-voltage synchronous buck switching regulator with 500kHz constant-frequency current-mode control. It supports 5.5V–60V input, delivers up to 1.5A peak switch current, features 0.2Ω internal NPN power switch, and operates in thermally enhanced 16-pin SSOP package. It is used in industrial power supplies requiring robust 5V rail generation from wide-range DC inputs.
For engineers reviewing the LT1956EGN-5#PBF datasheet, LT1956EGN-5#PBF pinout, LT1956EGN-5#PBF application, or LT1956EGN-5#PBF equivalent, key selection criteria include its fixed 5V output, 60V max input rating, cycle-by-cycle current limiting, shutdown current of 25µA, and compatibility with external synchronization from 580kHz to 700kHz.
Technical Context
The LT1956EGN-5#PBF implements a current-mode architecture with integrated 1.5A NPN power switch and patented circuitry that maintains peak switch current across the full duty cycle range-unlike conventional current-mode controllers where limit degrades above 50% duty. Its BOOST pin enables saturation of the bipolar switch via external capacitor/diode, reducing conduction loss to ~0.2Ω equivalent.
It integrates dual shutdown thresholds (2.38V UVLO and 0.4V deep shutdown), frequency foldback below 0.8V FB/SENSE voltage, and current-limit foldback below 0.6V SENSE-enabling controlled short-circuit response without thermal runaway. The SENSE pin is internally tied to the 5V output and serves as both regulation feedback and fault-sensing node.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±1.2% (guaranteed over –40°C to 125°C) |
| Input Voltage Range | 5.5V to 60V - supports 24V/48V industrial buses and automotive transients |
| Switch Current Limit | 1.5A minimum (maintained across full duty cycle - no derating) |
| Switch On Resistance | 0.2Ω typical - enables low conduction loss at high current |
| Switching Frequency | 500kHz ±8% - fixed frequency simplifies EMI filtering design |
| Shutdown Current | 25µA maximum - enables ultra-low-power standby in battery systems |
| Thermal Package | 16-pin SSOP with exposed thermal pad - θJA = 85°C/W, requires PCB ground plane soldering |
Pinout & Package
LT1956EGN-5#PBF is housed in a 16-lead plastic SSOP package with four corner GND pins (1, 8, 9, 16) and an exposed thermal pad on the underside requiring solder connection to PCB ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 8, 9, 16) | Power and signal reference | Must be connected to low-impedance ground plane; load return path must tie directly to these pins to avoid ground bounce |
| SW (2) | Switch emitter node | Drives external inductor; swings from near 0V to VIN during operation; negative swing clamped externally |
| VIN (4) | Power switch collector & bias source | Supplies internal circuitry when BIAS pin is unconnected; high dI/dt node requiring local ceramic bypass |
| BOOST (6) | Switch driver boost supply | Requires external capacitor/diode to generate >VIN voltage; enables NPN saturation and 0.2Ω effective RDS(on) |
| BIAS (10) | Efficiency optimization input | Connect to regulated 5V output to reduce input current draw and improve light-load efficiency |
| SHDN (15) | Enable/disable control | 2.38V threshold enables UVLO; 0.4V threshold forces micropower shutdown (25µA IQ) |
| SYNC (14) | External clock input | Logic-compatible input; synchronizes internal oscillator from 580kHz to 700kHz; tie to GND if unused |
| SENSE (12) | Output voltage sensing | Internally connected to 5V output; monitors regulation and triggers foldback protection below 0.8V |
Key Features
| Feature | Design Value |
|---|---|
| Patented duty-cycle-independent current limit | Maintains 1.5A peak switch current at any duty cycle - eliminates need for slope compensation redesign |
| Integrated 5V output sensing | No external resistor divider required - reduces BOM count and improves accuracy vs. discrete feedback |
| Two-stage shutdown control | 2.38V UVLO prevents startup until input stabilizes; 0.4V deep shutdown cuts IQ to 25µA for battery longevity |
| Frequency and current foldback | Reduces switching frequency and limits peak current during short-circuit - limits power dissipation in IC and external components |
| BOOST-driven saturated NPN switch | Enables 0.2Ω effective on-resistance using compact bipolar die - achieves FET-like efficiency without MOSFET gate drive complexity |
Applications
| Industrial 24V/48V DC-DC Conversion | Automotive Load Dump-Resilient Power Supply |
|---|---|
Use Scenario: Converting 36V nominal vehicle battery (with 60V load dump transients) to stable 5V for microcontroller and sensor rails. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, transient-hardened 5V output with UVLO and foldback protection. Use Value: Withstands 60V input transients without external TVS; 25µA shutdown current extends battery life during vehicle sleep mode. |
Use Scenario: Generating 5V for infotainment head unit logic from 12V/24V truck electrical system with wide voltage variation. IC Role / Device Role / Timing Role: Fixed-output step-down controller delivering regulated 5V under cold-crank (4.6V min) and alternator-overvoltage (60V max) conditions. Use Value: Maintains regulation down to 4.6V input and survives 60V surges - eliminates need for pre-regulator stage. |
| Distributed Power in Factory Automation | Portable Test Equipment Power Management |
Use Scenario: Local 5V rail generation from 48V backplane in PLC I/O modules with space-constrained PCB layout. IC Role / Device Role / Timing Role: Compact, thermally efficient buck converter enabling high-density power distribution without heatsinks. Use Value: SSOP package with exposed pad achieves 85°C/W θJA; BOOST-assisted saturation minimizes thermal stress at full 1.5A load. |
Use Scenario: Battery-powered handheld tester requiring 5V rail from Li-ion (3.0–4.2V) or 9V alkaline stack with extended runtime. IC Role / Device Role / Timing Role: High-input-range buck controller accepting up to 60V - allows use of universal AC/DC adapter or multi-cell battery packs. Use Value: 2.5mA quiescent current and 25µA shutdown enable >1-year shelf life; fixed 5V output simplifies system-level power sequencing. |
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 | 40V max input, 1.2A output, 3mm × 4mm MSOP package, 3.5µA IQ | Better light-load efficiency and smaller footprint; unsuitable for >40V inputs or >1.2A loads | Select for space-constrained, lower-voltage designs where 40V ceiling is acceptable. |
| LM5164QPWPRQ1 | 100V max input, 0.6A output, 600kHz sync capability, AEC-Q100 qualified | Higher voltage rating and automotive qualification; lower current limit restricts use to sub-0.6A 5V rails | Select for automotive applications requiring 100V surge tolerance and functional safety compliance. |
Compared with LTC3631EMSE-5#PBF and LM5164QPWPRQ1, LT1956EGN-5#PBF uniquely balances 60V input capability, 1.5A output, fixed 5V configuration, and SSOP thermal performance - making it optimal for industrial 24V/48V systems needing robust, medium-current 5V conversion without automotive certification overhead.
Availability
LT1956EGN-5#PBF is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and distributed power systems requiring stable component supply with long-term lifecycle assurance.
Supply support for LT1956EGN-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 support, documentation, 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 operating temperature range (–40°C to 125°C), and integrated protection features without external complexity.
FAQ
What is the absolute maximum input voltage rating for the LT1956EGN-5#PBF?
The LT1956EGN-5#PBF has an absolute maximum input voltage rating of 60V on the VIN pin. Exceeding this voltage risks permanent damage. The device is rated for continuous operation from 5.5V to 60V, making it suitable for 48V industrial buses and automotive load-dump scenarios where transients reach 60V.
Does the LT1956EGN-5#PBF require an external feedback resistor divider?
No, the LT1956EGN-5#PBF does not require an external feedback resistor divider. It is the fixed 5V output variant - the internal SENSE pin is factory-connected to the 5V output, eliminating external resistors and ensuring ±1.2% output accuracy over temperature and line conditions.
How does the BOOST pin function in the LT1956EGN-5#PBF?
The BOOST pin on the LT1956EGN-5#PBF provides a voltage higher than VIN to the internal NPN switch driver, enabling full saturation and achieving an effective on-resistance of 0.2Ω. It requires an external flying capacitor and Schottky diode; without BOOST, switch conduction loss increases significantly.
What protection features are built into the LT1956EGN-5#PBF?
The LT1956EGN-5#PBF includes cycle-by-cycle current limiting, frequency foldback below 0.8V SENSE voltage, current-limit foldback below 0.6V SENSE voltage, undervoltage lockout (2.38V SHDN threshold), and thermal shutdown. These operate autonomously without external components to protect against short circuits and overloads.
Can the LT1956EGN-5#PBF be synchronized to an external clock?
Yes, the LT1956EGN-5#PBF can be synchronized to an external clock via the SYNC pin (Pin 14). It accepts logic-level signals with 10%–90% duty cycle and locks to frequencies from 580kHz to 700kHz - enabling EMI reduction through frequency coordination in multi-rail systems.
LT1956EGN-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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LT1956EGN-5#PBF FAQ
1.How can I place an order for LT1956EGN-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1956EGN-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 LT1956EGN-5#PBF reliable?
The price and inventory of LT1956EGN-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 LT1956EGN-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1956EGN-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1956EGN-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1956EGN-5#PBF?
LT1956EGN-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1956EGN-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 LT1956EGN-5#PBF?
For technical support, including LT1956EGN-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1956EGN-5#PBF requirements.
6.How does Aetrix verify that LT1956EGN-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1956EGN-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 LT1956EGN-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1956EGN-5#PBF?
All LT1956EGN-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1956EGN-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 LT1956EGN-5#PBF part is unused and in its original packaging.
Return procedure for LT1956EGN-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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