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Analog Devices Inc. LT1956EGN#PBF
- Part No.:
- LT1956EGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1956EGN#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,209
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Product details
Overview
LT1956EGN#PBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode 500kHz step-down switching regulator with 5.5V to 60V input range, 1.5A peak switch current, and 0.2Ω on-resistance. It features a fixed 1.219V feedback reference, 2.5mA quiescent supply current, and operates in thermally enhanced 16-pin SSOP package. Used in industrial power supplies requiring stable 5V or adjustable output under wide-input transients.
For engineers reviewing the LT1956EGN#PBF datasheet, LT1956EGN#PBF pinout, LT1956EGN#PBF application, or LT1956EGN#PBF equivalent, key selection criteria include its wide VIN range (≤60V), maintained 1.5A peak switch current across full duty cycle, cycle-by-cycle current limiting, 500kHz constant-frequency operation, and compatibility with external synchronization from 580kHz to 700kHz.
Technical Context
The LT1956EGN#PBF implements a current-mode buck architecture with dual comparators for peak current sensing and error amplification, enabling fast transient response and inherent loop stability. Its patented circuitry cancels slope compensation effects to preserve 1.5A peak switch current up to 90% duty cycle - unlike conventional current-mode controllers.
It integrates a high-voltage NPN power switch with BOOST pin-driven saturation, reducing conduction loss to ~0.2Ω. The BIAS pin allows output-derived biasing to improve efficiency at high VIN/light load, while SHDN provides dual-threshold control (2.38V UVLO, 0.4V deep shutdown) and SYNC supports logic-level external clock injection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - supports automotive battery, industrial 24/48V rails, and transient-tolerant designs. |
| Switch Current Limit | 1.5A (min) - guaranteed peak current delivery across full duty cycle, enabling robust overload handling. |
| Switch On Resistance | 0.2Ω (typ) - low conduction loss enables high efficiency without external MOSFET. |
| Switching Frequency | 500kHz (±10%) - fixed frequency simplifies EMI filtering; externally synchronizable 580–700kHz. |
| Feedback Reference | 1.219V (±1.2%) - precise internal reference enables accurate output regulation with external resistor divider. |
| Quiescent Supply Current | 2.5mA (typ) - low operating current supports energy-sensitive applications. |
| Shutdown Current | 25µA (max) - ultra-low standby draw extends battery life in portable systems. |
| Operating Junction Temp | –40°C to 125°C - qualified for industrial and automotive under-hood environments. |
Pinout & Package
LT1956EGN#PBF is housed in a 16-lead plastic SSOP (GN) package with exposed thermal pad soldered to ground plane. Four corner pins (1, 8, 9, 16) are GND for low-impedance return path and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 8, 9, 16) | Power and signal reference ground | Multiple dedicated GND pins minimize ground bounce and improve load regulation; exposed pad must be soldered to PCB ground plane. |
| SW (2) | Emitter of internal NPN power switch | Connects to inductor and catch diode anode; swings from near 0V to VIN during operation; clamped to –0.8V max. |
| VIN (4) | Collector of internal NPN switch and primary bias source | Supplies internal circuitry when BIAS pin is unconnected; requires low-inductance input capacitor placement. |
| BOOST (6) | Boost capacitor drive node | Provides voltage >VIN to saturate internal switch; requires external diode + capacitor to achieve 0.2Ω RON. |
| FB (12) | Feedback input for adjustable output | Accepts 1.219V reference voltage; connects to resistor divider; enables foldback protection below 0.8V. |
| VC (11) | Error amplifier output / current limit comparator input | Used for loop compensation; also serves as current clamp point; 1V–2V swing under normal load. |
| SHDN (15) | Enable/disable control with dual thresholds | 2.38V = UVLO activation; 0.4V = full micropower shutdown; internal bias lifts pin if left floating. |
| SYNC (14) | External oscillator synchronization input | Logic-compatible (1.5–2.2V min amplitude); accepts 580–700kHz square wave; tie to GND if unused. |
| BIAS (10) | Secondary bias supply input | Connect to regulated output ≥3V to reduce input current draw and improve efficiency at high VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Patented duty-cycle invariant current limit | Maintains 1.5A peak switch current up to 90% duty cycle - eliminates typical current-mode rolloff above 50% DC. |
| Integrated BOOST driver | Enables bipolar NPN switch saturation via external boost capacitor/diode, achieving FET-like 0.2Ω RON with smaller die area. |
| Two-stage shutdown control | 2.38V threshold provides precise undervoltage lockout; 0.4V threshold forces <25µA shutdown current for battery preservation. |
| Feedback pin multifunctionality | Below 0.8V: reduces switching frequency; below 0.6V: folds back current limit and disables SYNC - protects during short-circuit startup. |
| Output-derived biasing (BIAS pin) | When connected to VOUT ≥3V, shifts internal bias current from VIN to VOUT, improving efficiency especially at VIN ≫ VOUT. |
Applications
| Industrial Power Supplies | Automotive Subsystem Power |
|---|---|
Use Scenario: Distributed 5V/3.3V rail generation in PLC I/O modules powered from 24VDC field bus with ±10% tolerance and 60V surge capability. IC Role / Device Role / Timing Role: Primary buck controller regulating stable output despite wide input variation and load transients. Use Value: 60V absolute max input rating and 1.5A sustained switch current enable direct replacement of discrete solutions without derating. | Use Scenario: Infotainment head unit power stage converting 12V battery (transient to 60V) to 5V for USB peripherals and microcontrollers. IC Role / Device Role / Timing Role: High-reliability DC/DC converter with UVLO and thermal protection for automotive-grade operation. Use Value: Dual-threshold SHDN pin ensures clean power sequencing and prevents brownout operation during cranking events. |
| Portable Test Equipment | Battery Charger Auxiliary Supply |
Use Scenario: Handheld multimeter or oscilloscope using Li-ion pack (8.4V–12.6V) to generate isolated 5V for analog front-end and MCU. IC Role / Device Role / Timing Role: Efficient step-down regulator with low quiescent current and compact SSOP footprint. Use Value: 2.5mA IVIN and 25µA shutdown current extend runtime; SSOP package fits tight board space constraints. | Use Scenario: 24V wall adapter-based charger providing 5V auxiliary power for status LED, communication IC, and fan control. IC Role / Device Role / Timing Role: Secondary buck regulator delivering clean, regulated 5V independent of main charging path. Use Value: Synchronizable 500kHz operation allows noise coordination with primary converter to avoid beat frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | 42V max VIN, 1.2A switch, 3mm × 4mm MSOP, integrated MOSFETs, no BOOST pin required | Better suited for space-constrained, lower-voltage designs; lacks 60V rating and duty-cycle invariant current limit | Select LTC3631EMSE#PBF only if input stays ≤42V and peak current ≤1.2A; not drop-in for LT1956EGN#PBF's high-VIN/high-current use cases |
| MP2451DT-LF-Z | 36V max VIN, 0.6A switch, 8-pin SOIC, fixed 500kHz, no SYNC or BOOST functionality | Cost-optimized for consumer-grade 12V/24V inputs; lacks UVLO precision, thermal enhancement, and wide-VIN robustness | Choose MP2451DT-LF-Z only for non-critical, low-power applications where 60V tolerance and 1.5A current are unnecessary |
Compared with LTC3631EMSE#PBF and MP2451DT-LF-Z, LT1956EGN#PBF uniquely delivers 60V input capability, 1.5A peak current maintained across full duty cycle, and BOOST-assisted saturation - making it irreplaceable in high-reliability industrial and automotive buck designs requiring extended voltage margin.
Availability
LT1956EGN#PBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive subsystems, portable test equipment, and battery charger auxiliary supplies requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT1956EGN#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT1956EGN#PBF belongs to Linear's high-voltage monolithic buck regulator product line, designed specifically for rugged industrial, transportation, and distributed power applications demanding wide input range, high peak current, and thermal resilience.
FAQ
What is the maximum input voltage rating for the LT1956EGN#PBF?
The LT1956EGN#PBF has an absolute maximum input voltage (VIN) rating of 60V, with guaranteed operation from 5.5V to 60V. This makes LT1956EGN#PBF suitable for applications exposed to automotive load-dump transients or industrial 48V DC systems. Exceeding 60V risks permanent damage per Absolute Maximum Ratings.
Does the LT1956EGN#PBF require an external boost capacitor, and why?
Yes, the LT1956EGN#PBF requires an external boost capacitor and diode connected to the BOOST pin to saturate its internal NPN power switch. Without this network, switch conduction loss would be ~1.5V; with BOOST, on-resistance drops to 0.2Ω, directly enabling high efficiency. LT1956EGN#PBF's BOOST architecture is essential to its performance specification.
Can the LT1956EGN#PBF be synchronized to an external clock, and what is the valid frequency range?
Yes, the LT1956EGN#PBF supports external synchronization via the SYNC pin, accepting logic-level square waves from 580kHz to 700kHz. The internal oscillator locks to the external signal within this band. If unused, SYNC must be tied to GND. This feature allows LT1956EGN#PBF to avoid noise-sensitive bands or coordinate switching with other converters in multi-rail systems.
How does the LT1956EGN#PBF handle short-circuit conditions on its output?
The LT1956EGN#PBF employs dual-foldback protection triggered by the FB pin: below 0.8V, switching frequency reduces ~5:1; below 0.6V, peak switch current folds back and SYNC is disabled. This limits power dissipation in LT1956EGN#PBF, the catch diode, and inductor during sustained shorts. The behavior is transparent under normal operation but critical for reliability in fault-prone environments.
What is the function of the BIAS pin on the LT1956EGN#PBF, and when should it be used?
The BIAS pin on LT1956EGN#PBF allows routing internal bias current from VIN to the regulated output (≥3V), reducing total input current draw and improving efficiency - especially when VIN ≫ VOUT. For example, with VIN = 48V and VOUT = 5V, connecting BIAS to VOUT lowers effective quiescent current. LT1956EGN#PBF's BIAS pin is optional but recommended for high-input, light-load scenarios.
LT1956EGN#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:
- 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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LT1956EGN#PBF FAQ
1.How can I place an order for LT1956EGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1956EGN#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#PBF reliable?
The price and inventory of LT1956EGN#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#PBF is usually 5 days.
3.What payment methods are accepted for LT1956EGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1956EGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1956EGN#PBF?
LT1956EGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1956EGN#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#PBF?
For technical support, including LT1956EGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1956EGN#PBF requirements.
6.How does Aetrix verify that LT1956EGN#PBF is sourced from the original manufacturer or authorized distributors?
All LT1956EGN#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#PBF meets industry standards.
7.What is the process for return or replacement of LT1956EGN#PBF?
All LT1956EGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1956EGN#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#PBF part is unused and in its original packaging.
Return procedure for LT1956EGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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