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Analog Devices Inc. LT1956EFE#TRPBF
- Part No.:
- LT1956EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1956EFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,299
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Product details
Overview
LT1956EFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode synchronous step-down DC/DC converter IC designed for industrial power conversion. It delivers up to 1.5A peak switch current, operates from 5.5V to 60V input, maintains constant 500kHz switching frequency, features 0.2Ω internal NPN switch on-resistance, and provides 1.219V feedback reference with ±1% tolerance over temperature. It is used in battery-powered systems requiring robust input transient handling.
For engineers reviewing the LT1956EFE#TRPBF datasheet, LT1956EFE#TRPBF pinout, LT1956EFE#TRPBF application, or LT1956EFE#TRPBF equivalent, key selection criteria include wide-input voltage capability (≤60V), thermally enhanced TSSOP-16 package with exposed pad, cycle-by-cycle current limiting, shutdown current of 25µA, and compatibility with external synchronization from 580kHz to 700kHz.
Technical Context
The LT1956EFE#TRPBF implements a current-mode control 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 regulators 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 comparators (2.38V UVLO and 0.4V deep shutdown), frequency foldback below 0.8V FB voltage, and current-limit foldback below 0.6V FB voltage-enabling safe short-circuit operation without thermal runaway. The VC pin serves as error amplifier output and current-limit threshold input, supporting loop compensation and external override.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - supports 24V/48V industrial rails and automotive cold-crank transients. |
| Switch Current Limit | 1.5A (min) - sustained over full duty cycle, enabling stable operation at high VOUT/VIN ratios. |
| Switch On Resistance | 0.2Ω (typ) - achieved via BOOST-assisted saturation, minimizing conduction loss at high current. |
| Switching Frequency | 500kHz (±10%) - fixed-frequency operation simplifies EMI filtering; synchronizable to 580–700kHz. |
| Feedback Reference | 1.219V (±1.3%) - precise internal bandgap reference enables accurate output regulation. |
| Shutdown Current | 25µA (max) - ultra-low quiescent draw enables long-term battery hold-up in portable systems. |
| Thermal Resistance θJA | 45°C/W - enabled by exposed-pad TSSOP-16 package, supporting >1A continuous load at 70°C ambient. |
Pinout & Package
LT1956EFE#TRPBF is housed in a 16-lead plastic TSSOP package with exposed thermal pad (FE package). The exposed pad must be soldered to a PCB ground plane for thermal and electrical performance. Pin 1 is located at the top-left corner when the notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Power and signal reference ground | Four dedicated GND pins minimize ground bounce; exposed pad must connect to PCB ground plane for thermal dissipation. |
| SW (Pin 2) | Switch emitter node | Connects to inductor and catch diode cathode; swings from near 0V to VIN; clamped to –0.8V max. |
| VIN (Pin 4) | Power switch collector supply | Provides bias for internal circuitry; carries high dI/dt during switching; requires low-inductance input bypass. |
| BOOST (Pin 6) | Switch driver boost supply | Accepts voltage ≥VIN + 2V; supplies saturated drive to NPN switch; draws pulsed current up to 70mA. |
| SHDN (Pin 15) | Enable/disable control | Dual-threshold: 2.38V disables switching (UVLO), 0.4V forces micropower shutdown (25µA IQ). |
| SYNC (Pin 14) | External oscillator sync input | Logic-compatible (1.5–2.2V min amplitude); accepts 580–700kHz square wave; disable by grounding. |
| FB (Pin 12) | Feedback voltage sense | 1.219V reference input; monitors resistive divider; triggers frequency/current foldback below 0.8V/0.6V. |
| VC (Pin 11) | Error amplifier output / current limit control | Drives peak-current comparator; used for compensation; clamp range 0.9–2.1V; sink/source capable. |
| BIAS (Pin 10) | Efficiency-boost bias supply | When tied to VOUT ≥3V, shifts internal bias current from VIN to VOUT, improving light-load efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Patented duty-cycle-independent current limit | Maintains 1.5A peak switch current from 0% to 90% duty cycle-enables stable 5V-out-from-60V-in designs without derating. |
| Integrated BOOST-driven NPN switch | 0.2Ω on-resistance achieved via external BOOST capacitor/diode, delivering FET-like efficiency in bipolar process. |
| Two-stage shutdown with UVLO | 2.38V threshold prevents startup until input reaches safe operating level; 0.4V threshold reduces IQ to 25µA for battery preservation. |
| Frequency and current foldback protection | Reduces fSW to ~100kHz and limits switch current to <1A during soft-start or short-circuit-limits power dissipation in IC and external components. |
| Thermally enhanced TSSOP-16 (FE) | θJA = 45°C/W and θJC = 10°C/W enable 1.2A continuous output at 70°C ambient without heatsink. |
Applications
| Industrial Power Supply | Automotive Battery Management |
|---|---|
Use Scenario: Distributed 5V rail generation from 24V or 48V factory bus in PLC I/O modules. IC Role / Device Role / Timing Role: Primary buck regulator controlling power delivery to microcontrollers, sensors, and isolated communication interfaces. Use Value: 60V absolute max input withstands 48V bus transients; 1.5A output supports multiple downstream LDOs; 500kHz switching allows compact 10–15µH inductors. |
Use Scenario: Powering infotainment head-unit logic from vehicle battery (9–16V nominal, up to 60V load-dump). IC Role / Device Role / Timing Role: High-reliability DC/DC converter providing regulated 5V to MCU and display controller. Use Value: Dual-threshold SHDN ensures clean startup after cranking; frequency foldback prevents thermal failure during cold-crank brownouts. |
| Portable Test Equipment | Battery Charger Auxiliary Rail |
Use Scenario: Handheld multimeter or oscilloscope using Li-ion pack (8.4V–12.6V) to generate 5V for ADC, display, and USB interface. IC Role / Device Role / Timing Role: Main system regulator managing dynamic load steps from backlight and processor bursts. Use Value: 25µA shutdown current extends shelf life; BIAS pin connection to 5V output improves light-load efficiency >85% at 10mA. |
Use Scenario: Generating 5V auxiliary supply in multi-cell lithium battery charger to power fuel-gauge IC and status LEDs. IC Role / Device Role / Timing Role: Isolated secondary-side regulator powered from charger's intermediate bus. Use Value: 5.5V minimum input allows operation down to single-cell LiFePO4 (≈2.5V/cell × 3 = 7.5V); NC pins simplify layout in space-constrained charger PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | 40V max input, 1.2A output, integrated MOSFETs, 3mm × 4mm MSOP-10 package; no BOOST pin required. | Better suited for space-constrained, lower-input-voltage designs; lacks 60V rating and duty-cycle-independent current limit. | Select when input ≤40V and board area is critical; not drop-in for 48V+ systems. |
| LM5164QPWPRQ1 | 65V max input, 1A output, integrated high-side MOSFET, 500kHz fixed frequency, automotive AEC-Q100 qualified. | Designed for automotive environments; lower current rating and no VC pin for loop override. | Prefer for automotive-grade 1A applications; requires redesign for >1A loads or VC-based compensation. |
Compared with LTC3631EMSE#PBF and LM5164QPWPRQ1, LT1956EFE#TRPBF uniquely combines 60V input, 1.5A switch current maintained across full duty cycle, and BOOST-assisted bipolar switch-making it optimal for industrial 48V-to-5V conversion where reliability under transient stress and high-current capability are prioritized over footprint or automotive qualification.
Availability
LT1956EFE#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery management systems, and portable test equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LT1956EFE#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, Inc. (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 LT1956EFE#TRPBF belongs to Linear's high-voltage monolithic buck regulator product line, engineered specifically for rugged industrial and transportation applications demanding wide input range, fault resilience, and thermal robustness in compact packages.
FAQ
What is the maximum input voltage rating for LT1956EFE#TRPBF?
The LT1956EFE#TRPBF has an absolute maximum input voltage rating of 60V on the VIN pin. Operation is specified from 5.5V to 60V, and the device sustains full performance-including 1.5A switch current and 500kHz switching-across this entire range. Transient spikes beyond 60V risk permanent damage and must be clamped externally.
Does LT1956EFE#TRPBF require an external BOOST capacitor, and why?
Yes, LT1956EFE#TRPBF requires an external BOOST capacitor (typically 10nF–100nF ceramic) connected between BOOST and SW pins, along with a small-signal diode (e.g., MMSD914) from VIN to BOOST. This network generates a voltage higher than VIN to saturate the internal NPN switch, achieving the specified 0.2Ω on-resistance and minimizing conduction loss.
How does the LT1956EFE#TRPBF handle short-circuit conditions?
The LT1956EFE#TRPBF employs dual-foldback protection: when FB voltage drops below 0.8V, switching frequency reduces from 500kHz to ~100kHz; below 0.6V, peak switch current folds back from 1.5A to <1A. This coordinated action limits power dissipation in the IC, inductor, and catch diode during sustained shorts or start-up into heavy loads.
Can LT1956EFE#TRPBF be synchronized to an external clock, and what is the valid range?
Yes, LT1956EFE#TRPBF supports external synchronization via the SYNC pin (Pin 14). It accepts logic-level square waves with 10–90% duty cycle across a 580kHz to 700kHz range. If unused, SYNC must be tied to GND; floating the pin may cause erratic operation due to noise susceptibility.
What is the purpose of the BIAS pin on LT1956EFE#TRPBF, and how should it be used?
The BIAS pin (Pin 10) improves light-load efficiency by redirecting internal bias current from VIN to the regulated output (e.g., 5V). When connected to VOUT ≥3V, it reduces total input-referred quiescent current-especially beneficial in battery-powered systems. Leaving BIAS unconnected defaults to VIN biasing, which increases IQ at high input voltages.
LT1956EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- 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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT1956EFE#TRPBF FAQ
1.How can I place an order for LT1956EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1956EFE#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 LT1956EFE#TRPBF reliable?
The price and inventory of LT1956EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1956EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1956EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1956EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1956EFE#TRPBF?
LT1956EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1956EFE#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 LT1956EFE#TRPBF?
For technical support, including LT1956EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1956EFE#TRPBF requirements.
6.How does Aetrix verify that LT1956EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1956EFE#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 LT1956EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1956EFE#TRPBF?
All LT1956EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1956EFE#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 LT1956EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT1956EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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