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Analog Devices Inc. LT1074CT#PBF
- Part No.:
- LT1074CT#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5
- Datasheet:
-
LT1074CT#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:118
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Product details
Overview
LT1074CT#PBF from Analog Devices (formerly Linear Technology) is a 5A monolithic bipolar step-down switching regulator in TO-220-5 package, featuring 100kHz fixed-frequency operation, 8V–60V input range, 2.5V–50V adjustable output, and integrated 5A Darlington power switch. It enables high-current buck, tapped-inductor buck (up to 10A), positive-to-negative, and negative-boost topologies in industrial power supplies and embedded DC/DC conversion.
For engineers reviewing the LT1074CT#PBF datasheet, LT1074CT#PBF pinout, LT1074CT#PBF application, or LT1074CT#PBF equivalent, key selection criteria include verified 5A switch current capability, −40°C to 125°C junction temperature rating, programmable current limit via ILIM pin, micropower shutdown mode (140µA), and analog multiplier-based feedback for line-transient immunity.
Technical Context
The LT1074CT#PBF implements a classic buck topology with patented switch drive enabling VSW swing 40V below ground-critical for tapped-inductor and inverting configurations. Its true analog multiplier in the feedback loop ensures loop gain independence from input voltage, delivering near-instantaneous response to VIN transients.
On-chip pulse-by-pulse current limiting with ≈600ns detection time and thermal shutdown protect against overloads and shorts. Frequency shifting (100kHz → 20kHz) activates when FB drops below 1.3V, maintaining control during severe output faults without requiring external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5A continuous (onboard Darlington switch); supports 10A tapped-inductor buck with external winding |
| Input Voltage Range | 8V to 60V (buck mode); self-boot allows ≥5V in inverting/boost modes |
| Switching Frequency | Fixed 100kHz (±10%); shifts linearly to 20kHz when FB < 1.3V for short-circuit control |
| Current Limit | 6.5A typical (ILIM open); adjustable down to zero via external resistor on 7-pin variants (not applicable to CT#PBF) |
| Quiescent Current | 8.5mA normal operation; 140µA in micropower shutdown mode |
| Reference Voltage | 2.21V ±1.5% (trimmed internal bandgap); used for feedback divider ratio calculation |
| Thermal Resistance | θJA = 50°C/W (TO-220 on 0.5in² 1oz copper); θJC = 2.5°C/W |
Pinout & Package
LT1074CT#PBF is housed in a 5-lead plastic TO-220 package (T package) with tab connected to GND. The case serves as thermal and electrical ground reference; mounting requires direct mechanical and thermal contact to heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply and high-side switch source | Carries full input current; must be bypassed with low-ESR capacitor placed adjacent to pin |
| VSW | Switch collector output | Swings up to 40V below GND; drives external inductor/diode; requires snubber for EMI control |
| GND | Power and signal reference | Internal reference tied to this pin; must connect directly to low-current output return path (not high-current load ground) |
| VC | Error amplifier output | Drives external RC compensation network; asymmetrical sourcing/sinking (140µA/1.1mA) minimizes startup overshoot |
| FB/SENSE | Inverting input of error amplifier | Compares divided output voltage to 2.21V reference; ripple >100mVp-p causes output error |
Key Features
| Feature | Design Value |
|---|---|
| Analog multiplier feedback | Eliminates input-voltage-dependent loop gain variation, enabling stable regulation across wide VIN ranges without recompensation |
| VSW swing to −40V | Enables direct drive of tapped-inductor buck (10A) and positive-to-negative converters without level-shifting circuitry |
| Pulse-by-pulse current limiting | 600ns fault detection ensures immediate switch turn-off during overload, preventing thermal runaway under short-circuit |
| Frequency shifting at low FB | Linear reduction from 100kHz to 20kHz below FB = 1.3V maintains minimum on-time control during output faults |
| Micropower shutdown | 140µA supply current in shutdown mode with defined thresholds (2.45V active, 0.3V full shutdown) |
Applications
| Industrial DC/DC Power Supply | High-Current Tapped-Inductor Buck |
|---|---|
Use Scenario: Converting 24V or 48V factory bus to 5V/12V for PLC I/O modules and sensor interfaces requiring >5A continuous current. IC Role / Device Role / Timing Role: Primary buck controller with integrated 5A switch; regulates output using external R1/R2 feedback divider and VC compensation network. Use Value: Eliminates need for external high-current MOSFET driver and sense resistor; reduces BOM count by 4–6 components versus discrete controller + FET solution. | Use Scenario: Generating 5V@10A from 24V input in telecom shelf power where space and efficiency are constrained. IC Role / Device Role / Timing Role: Controller driving center-tapped inductor; VSW pin switches alternate halves of winding to achieve current doubling. Use Value: Leverages −40V VSW swing capability to avoid floating gate drivers; achieves >90% efficiency at full load per AN44 design examples. |
| Positive-to-Negative Converter | Programmable Undervoltage Lockout (UVLO) |
Use Scenario: Generating −5V rail from +24V for op-amp biasing or RS-232 interface in isolated industrial gateways. IC Role / Device Role / Timing Role: Inverting buck-boost controller; uses same external components as buck but reconfigures inductor/diode orientation. Use Value: No transformer or charge pump required; single IC replaces dual-rail solutions with better regulation and lower noise than capacitive inverters. | Use Scenario: Enabling clean system startup only when main 24V rail reaches stable 20V, preventing brownout resets in motor control H-bridges. IC Role / Device Role / Timing Role: UVLO function implemented via resistor divider on SHDN pin (requires 7-pin variant; CT#PBF uses fixed threshold). Use Value: Not applicable to LT1074CT#PBF - this feature requires LT1074CT7 or LT1074IT7 with SHDN and ILIM pins; CT#PBF lacks SHDN pin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1074HVCT#PBF | Higher 64V absolute max input voltage (vs. 45V); identical pinout, package, and functionality | Suitable for 48V automotive or PoE++ systems where transient spikes exceed 45V | Select HV version if input can exceed 45V; otherwise, standard LT1074CT#PBF offers same performance at lower cost |
| LT1076CT#PBF | 2A rated switch (vs. 5A); same 100kHz frequency, package, and control architecture | Lower-cost option for ≤2A loads; reduced thermal mass simplifies heatsinking | Use LT1076CT#PBF only when peak load current remains ≤2A; not a drop-in replacement for 5A designs |
Compared with LT1074HVCT#PBF, the LT1074CT#PBF trades 19V lower absolute input rating for cost advantage in 24V/36V industrial systems; versus LT1076CT#PBF, it delivers 2.5× higher output current but requires larger heatsink and higher-current magnetics.
Availability
LT1074CT#PBF is available at Aetrix Electronics and suitable for industrial DC/DC power supplies, high-current tapped-inductor converters, and positive-to-negative voltage generation requiring stable component supply and long-term manufacturability.
Supply support for LT1074CT#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 product support, documentation, and manufacturing continuity for legacy Linear regulators.
The LT1074 belongs to Linear's monolithic bipolar switching regulator family, designed for robust, high-current DC/DC conversion in harsh environments where reliability and wide input range outweigh CMOS efficiency gains.
FAQ
What is the maximum input voltage rating for LT1074CT#PBF?
The LT1074CT#PBF has an absolute maximum input voltage rating of 45V applied between VIN and GND. Operation above 45V risks permanent damage. For 48V nominal systems with transients, the LT1074HVCT#PBF (64V rating) is the validated alternative. The device operates down to 8V in buck mode, with self-boot enabling ≥5V operation in inverting configurations.
Does LT1074CT#PBF support adjustable current limiting?
No, the LT1074CT#PBF (5-pin TO-220) does not support adjustable current limiting. Its current limit is factory-set to 6.5A typical with ILIM pin internally tied off. Adjustable current limit requires the 7-pin variants LT1074CT7 or LT1074IT7, which expose the ILIM pin for external resistor programming. Attempting to modify current limit on LT1074CT#PBF is not supported and may cause malfunction.
Can LT1074CT#PBF be used in a positive-to-negative converter?
Yes, the LT1074CT#PBF is explicitly qualified for positive-to-negative converter topologies. Its VSW pin is specified to swing 40V below GND, enabling direct drive of the inductor in inverting configurations without level-shifting circuitry. Application Note 44 provides validated schematics and layout guidelines for −5V@1A operation from 4.5V–40V input.
What is the thermal resistance of LT1074CT#PBF in TO-220 package?
The LT1074CT#PBF has θJC = 2.5°C/W (junction-to-case) and θJA = 50°C/W (junction-to-ambient) when mounted on 0.5 in² of 1 oz. copper over an internal ground plane. These values assume proper soldering and heatsink contact. Derating is required above 125°C junction temperature; maximum operating junction temperature is 125°C for commercial grade.
Is LT1074CT#PBF RoHS compliant and lead-free?
Yes, LT1074CT#PBF is RoHS compliant and lead-free. The #PBF suffix denotes lead-free packaging per Analog Devices' environmental compliance standards. It meets JEDEC J-STD-020 moisture sensitivity level 3 and is compatible with standard Pb-free reflow profiles. Full compliance documentation is available in the official Analog Devices product change notice PCN-17-01.
LT1074CT#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-5
- 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-220-5
LT1074CT#PBF FAQ
1.How can I place an order for LT1074CT#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1074CT#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 LT1074CT#PBF reliable?
The price and inventory of LT1074CT#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1074CT#PBF is usually 5 days.
3.What payment methods are accepted for LT1074CT#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1074CT#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1074CT#PBF?
LT1074CT#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1074CT#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 LT1074CT#PBF?
For technical support, including LT1074CT#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1074CT#PBF requirements.
6.How does Aetrix verify that LT1074CT#PBF is sourced from the original manufacturer or authorized distributors?
All LT1074CT#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 LT1074CT#PBF meets industry standards.
7.What is the process for return or replacement of LT1074CT#PBF?
All LT1074CT#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1074CT#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 LT1074CT#PBF part is unused and in its original packaging.
Return procedure for LT1074CT#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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