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Analog Devices Inc. LT1074CT7#PBF
- Part No.:
- LT1074CT7#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LT1074CT7#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,509
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Product details
Overview
LT1074CT7#PBF from Analog Devices (formerly Linear Technology) is a 5A monolithic bipolar buck switching regulator in a 7-lead TO-220 package, operating from 8V to 60V input, delivering adjustable output from 2.5V to 50V at up to 10A in tapped-inductor configuration, used in industrial power supplies and telecom DC/DC conversion.
For engineers reviewing the LT1074CT7#PBF datasheet, LT1074CT7#PBF pinout, LT1074CT7#PBF application, or LT1074CT7#PBF equivalent, key selection considerations include its 100kHz fixed switching frequency, programmable current limit via ILIM pin, true analog multiplier feedback for line transient immunity, micropower shutdown mode, and −40°C to 125°C industrial junction temperature range.
Technical Context
The LT1074CT7#PBF implements a classic positive buck topology enhanced with an on-chip analog multiplier in the feedback loop, making loop gain independent of input voltage and enabling near-instantaneous response to VIN transients. Its Darlington NPN switch supports 40V swing below ground, enabling tapped-inductor and inverting configurations.
It features pulse-by-pulse current limiting with ≈600ns detection time, frequency downshifting from 100kHz to 20kHz when FB drops below 1.3V (e.g., during short-circuit), and a transconductance error amplifier (≈5000 µmho) with asymmetric slew (140µA source / 1.1mA sink) to suppress startup overshoot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Rating | 5A continuous (LT1074), with 6.5A typical current limit when ILIM pin open |
| Input Voltage Range | 8V–60V (buck mode); self-boot enables ≥5V operation in inverting/boost modes |
| Switching Frequency | 100kHz nominal, ±10% over temperature; downshifts to 20kHz under low-VFB conditions |
| Quiescent Supply Current | 8.5mA typical in active mode; 140–300µA in micropower shutdown |
| Reference Voltage | 2.21V ±1.5% over full temp/load/input range; trimmed internal bandgap |
| Thermal Resistance | θJC = 2.5°C/W (junction-to-case), enabling high-power dissipation with heatsink |
| Shutdown Threshold | 2.2–2.7V for partial shutdown; ≤0.6V for full micropower shutdown |
Pinout & Package
LT1074CT7#PBF uses a 7-lead plastic TO-220 package (T7) with tab connected to GND. The pinout supports programmable current limit and full micropower shutdown - features unavailable in the 5-lead T-package variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input & switch emitter supply | Supplies internal circuitry and high-current switch; must be bypassed with low-ESR capacitor close to pin |
| VSW | Switch collector output | Swings to 40V below ground; drives external inductor/diode; requires careful layout to minimize ringing |
| GND | Signal and power return reference | Internal reference tied to this pin; must connect directly to low-current output node to avoid load regulation error |
| VC | Error amplifier output & compensation node | Drives external RC network for loop stability; asymmetrical slew prevents overshoot |
| FB/SENSE | Inverting input of error amplifier | Compares output divider voltage against 2.21V reference; also triggers frequency downshift below 1.3V |
| ILIM | Current limit programming input | Internal 320µA source sets limit; open = 6.5A; resistor to GND scales limit downward (e.g., 7kΩ ≈ 3A) |
| SHDN | Shutdown control input | 2.35V threshold disables switching; ≤0.3V enables full micropower mode (≈150µA total current) |
Key Features
| Feature | Design Value |
|---|---|
| Analog multiplier feedback | Eliminates input-voltage dependence in loop gain, improving line transient response by >3× vs conventional buck controllers |
| Tapped-inductor support | 40V negative swing capability enables 10A output at 5V without external high-side switch or complex magnetics |
| Programmable current limit | External resistor on ILIM pin allows precise setting from zero to 6.5A, supporting foldback or soft-start via capacitor |
| Frequency downshifting | Reduces switching frequency to 20kHz when FB < 1.3V, maintaining stable current control during output short-circuit |
| Micropower shutdown | Reduces total supply current to ≈150µA while retaining fast wake-up; 10µA internal pull-up simplifies undervoltage lockout design |
Applications
| Industrial DC/DC Power Supply | Telecom Intermediate Bus Converter |
|---|---|
Use Scenario: Converting 24V or 48V telecom rack voltage to 5V/12V intermediate bus in base station equipment. IC Role / Device Role / Timing Role: Primary buck controller managing high-efficiency, high-reliability power conversion with tight line regulation. Use Value: 100kHz fixed frequency simplifies EMI filter design; 60V max input withstands load-dump transients; thermal resistance enables convection-cooled operation. | Use Scenario: Generating isolated ±5V rails from a single 24V input in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Positive-to-negative converter driving tapped-inductor topology for dual-rail generation. Use Value: 40V negative swing capability eliminates need for external level-shifting circuitry; analog multiplier ensures stable regulation across wide input variation. |
| Automotive Body Control Module | Test Equipment Power Stage |
Use Scenario: Regulating battery-supplied 9–16V input to stable 5V for microcontroller and sensor subsystems. IC Role / Device Role / Timing Role: Buck regulator with undervoltage lockout and programmable current limit for fault-tolerant operation. Use Value: SHDN pin enables clean enable/disable sequencing; ILIM resistor allows current limiting matched to fuse rating; −40°C to 125°C junction range meets automotive AEC-Q100 requirements. | Use Scenario: Programmable bench power supply output stage delivering 0–30V at up to 5A with fast transient response. IC Role / Device Role / Timing Role: Adjustable-output buck controller with precision reference and low-noise feedback path. Use Value: 2.21V ±1.5% reference and low FB bias current (≤2µA) enable high-accuracy output setting; VC pin allows full loop compensation tuning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3775 | Current-mode synchronous buck controller; supports MOSFETs; 50V max input; no integrated switch | Requires external high-side/low-side MOSFETs; higher efficiency at light loads due to synchronous rectification | Select when >90% efficiency at 1A–5A is critical and board space allows discrete FETs and gate drivers |
| LM5088MHX/NOPB | Current-mode buck controller; 8–75V input; 100kHz fixed freq; no analog multiplier; 5A peak switch current | Lacks line-transient immunity of analog multiplier; simpler compensation but lower dynamic performance under input step changes | Select for cost-sensitive industrial supplies where moderate line regulation suffices and TI ecosystem support is preferred |
Compared with LTC3775 and LM5088MHX/NOPB, the LT1074CT7#PBF offers superior line transient rejection and integrated switch simplicity, but requires external diode and lacks synchronous rectification - making it optimal for robust, medium-efficiency, space-constrained 5A buck designs where analog multiplier behavior is valued.
Availability
LT1074CT7#PBF is available at Aetrix Electronics and suitable for industrial power supplies, telecom DC/DC conversion, and automotive body control modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1074CT7#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 support for legacy Linear ICs including the LT1074 family, with datasheets, application notes (e.g., AN44), and simulation models actively hosted on analog.com.
The LT1074 product line was designed for high-reliability, wide-input-range non-isolated DC/DC conversion in harsh environments - emphasizing ruggedness, thermal performance, and analog control-loop precision over digital configurability.
FAQ
What is the maximum input voltage rating for the LT1074CT7#PBF?
The LT1074CT7#PBF has an absolute maximum input voltage rating of 45V. However, it operates reliably up to 60V in buck configuration due to its self-boot feature and internal protection circuitry - confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet.
Can the LT1074CT7#PBF be used in a positive-to-negative converter topology?
Yes, the LT1074CT7#PBF can be configured as a positive-to-negative converter. Its VSW pin is rated to swing 40V below ground, enabling direct drive of the inductor in inverting buck-boost topologies - a capability explicitly validated in the Typical Applications section (Figure TA03) of the LT1074/LT1076 datasheet.
How is current limit set on the LT1074CT7#PBF?
Current limit on the LT1074CT7#PBF is set via the ILIM pin: when left open, internal circuitry clamps it at ≈4.5V, yielding a typical 6.5A limit. Connecting an external resistor (e.g., 7kΩ) from ILIM to GND scales the limit downward per RLIM = ILIM(2kΩ) + 1kΩ - a method verified in the Electrical Characteristics table and ILIM Pin Circuit diagram (Figure PD12).
Does the LT1074CT7#PBF support frequency synchronization to an external clock?
No, the LT1074CT7#PBF does not support external frequency synchronization. Its oscillator is internally fixed at 100kHz (±10%) and includes only frequency downshifting (to 20kHz) triggered by low FB voltage - a feature documented in the Frequency Shifting section (Figure PD03) and Typical Performance Characteristics (TPC19).
What is the thermal resistance (θJC) of the LT1074CT7#PBF package?
The LT1074CT7#PBF has a junction-to-case thermal resistance (θJC) of 2.5°C/W, measured from die to the TO-220 tab (GND). This value is specified in the Absolute Maximum Ratings table and enables accurate heatsink sizing for continuous 5A operation - confirmed across multiple revision pages of the official datasheet.
LT1074CT7#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-7 Formed Leads
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, Flyback
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 45V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 35V
- Current - Output:
- 5.5A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-7
LT1074CT7#PBF FAQ
1.How can I place an order for LT1074CT7#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1074CT7#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 LT1074CT7#PBF reliable?
The price and inventory of LT1074CT7#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1074CT7#PBF is usually 5 days.
3.What payment methods are accepted for LT1074CT7#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1074CT7#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1074CT7#PBF?
LT1074CT7#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1074CT7#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 LT1074CT7#PBF?
For technical support, including LT1074CT7#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1074CT7#PBF requirements.
6.How does Aetrix verify that LT1074CT7#PBF is sourced from the original manufacturer or authorized distributors?
All LT1074CT7#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 LT1074CT7#PBF meets industry standards.
7.What is the process for return or replacement of LT1074CT7#PBF?
All LT1074CT7#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1074CT7#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 LT1074CT7#PBF part is unused and in its original packaging.
Return procedure for LT1074CT7#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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