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Analog Devices Inc. LT1072CS8#TRPBF
- Part No.:
- LT1072CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1072CS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.25A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,364
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Product details
Overview
LT1072CS8#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic current-mode switching regulator IC designed for high-efficiency DC/DC conversion in buck, boost, flyback, forward, inverting, and Cuk topologies. It integrates a 1.25A internal NPN power switch, oscillator, error amplifier, current-sense circuitry, and adaptive anti-saturation driver. With 3V to 60V input range, 40kHz fixed switching frequency, and 6mA quiescent current, it delivers up to 20W output power in compact S8 package - ideal for isolated offline converters and battery-powered industrial supplies.
For engineers reviewing the LT1072CS8#TRPBF datasheet, LT1072CS8#TRPBF pinout, LT1072CS8#TRPBF application, or LT1072CS8#TRPBF equivalent, key selection considerations include its flyback-regulated floating-output capability, external shutdown control via VC pin, 1.244V feedback reference tolerance, and dual-emitter (E1/E2) configuration enabling current-limit adjustment without PCB redesign.
Technical Context
The LT1072CS8#TRPBF operates in current-mode control: switch duty cycle is directly set by sensed switch current rather than output voltage, delivering fast line transient response and simplified loop compensation. Its internal 2.3V low-dropout regulator powers all circuitry independently of input voltage variation.
It supports flyback regulation mode by pulling FB pin low, activating a dedicated flyback amplifier with 16.3V reference and built-in blanking delay to reject leakage spikes. The VC pin serves quadruple functions: error amplifier output, current limit adjustment point, soft-start node, and shutdown threshold (≤0.15V disables regulator, drawing only 50µA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - enables direct operation from 12V/24V industrial rails or unregulated offline rectified inputs without pre-regulation. |
| Switch Current Limit | 1.25A typical at 25°C - sets maximum deliverable load current before foldback; reduced to 1A at 80% duty cycle per datasheet derating. |
| Feedback Reference Voltage | 1.244V ±20mV - defines regulated output voltage accuracy in standard topologies; used with resistor divider on FB pin. |
| Switching Frequency | 40kHz ±5kHz - fixed oscillator frequency; allows predictable EMI filtering and inductor sizing without external timing components. |
| Quiescent Supply Current | 6mA - enables high efficiency at light loads; critical for battery-backed or always-on systems. |
| Shutdown Supply Current | 50µA - ultra-low standby draw when VC pin pulled ≤0.15V; supports energy-sensitive sleep modes. |
| Flyback Reference Voltage | 16.3V ±1.3V - enables fully isolated output regulation without optocoupler or auxiliary winding in flyback mode. |
Pinout & Package
LT1072CS8#TRPBF is housed in an 8-lead plastic SO (narrow, 0.150-inch width) package (S8), RoHS-compliant and tape-and-reel packaged (#TRPBF). Thermal resistance θJA = 130°C/W; no heat sink required for ≤0.34W dissipation (e.g., [email protected] boost from 5V).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E2) | Second Emitter Terminal | Optional emitter connection; leaving open doubles RDS(on), reduces switch current limit by 2×, and lowers dissipation during overload - used for external current limiting. |
| 2 (VSW) | Switch Collector Output | High-voltage switching node connected to inductor/diode; rated 60V breakdown; carries full switch current. |
| 3 (E1) | Primary Emitter Terminal | Mandatory ground reference for power switch; must be tied to GND pin (Pin 4) - ensures accurate current sensing and thermal stability. |
| 4 (GND) | Power & Signal Ground | Common return for internal regulator, error amp, and switch emitter; separate from E1/E2 to minimize ground bounce in high-dI/dt paths. |
| 5 (VC) | Error Amplifier Output / Control | Multi-function pin: sets current limit (0–2V), enables soft-start (capacitor clamp), and triggers shutdown (<0.15V). |
| 6 (FB) | Feedback Input | Voltage-sense node for output regulation; 1.244V reference in standard mode; <0.54V selects flyback regulation mode. |
| 7 (NC) | No Connect | Internally unused; must remain unconnected per datasheet - not for grounding or routing. |
| 8 (VIN) | Power Input | Main supply input (3–60V); powers internal LDO and oscillator; requires local 1µF ceramic bypass near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.25A NPN Switch | Eliminates external transistor and drive circuitry - reduces BOM count and layout complexity in 20W-class converters. |
| Flyback Regulation Mode | Enables optocoupler-free isolated outputs by regulating transformer flyback pulse amplitude - simplifies safety-certified designs. |
| Adaptive Anti-Saturation Drive | Dynamically adjusts base drive to minimize switch saturation voltage across load range - maintains >85% efficiency from 10% to full load. |
| External Synchronization Support | Accepts 48–70kHz external clock via VC pin pull-down - enables EMI spread-spectrum or multi-phase interleaving without component change. |
| Self-Protected Overload Handling | Combines current-mode foldback, thermal shutdown (untested but functional), and internal current limiting - prevents damage during short-circuit or startup surge. |
Applications
| Industrial Offline Power Supply | Battery-Powered DC/DC Boost |
|---|---|
Use Scenario: 24V AC/DC adapter powering PLC I/O modules with reinforced isolation requirements. IC Role / Device Role / Timing Role: Primary-side controller in flyback topology; regulates isolated 5V/±15V outputs using FB pin's flyback mode. Use Value: Achieves <1% output regulation across line/load without optocoupler - reduces certification cost and improves long-term reliability. | Use Scenario: Portable test equipment requiring 12V rail from single 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Boost converter controller; VIN=3.7V, [email protected], operating at 40kHz with 220µH inductor. Use Value: Delivers >88% peak efficiency and 6mA quiescent draw - extends runtime by 35% vs. linear solution. |
| Negative-to-Positive Inverter | High-Voltage Bias Supply |
Use Scenario: Signal conditioning circuit needing +5V from existing –12V rail in telecom line card. IC Role / Device Role / Timing Role: Inverting topology controller; uses LT1072CS8#TRPBF in buck-boost configuration with grounded FB and VC bias. Use Value: Generates stable 5V@1A with <50mV ripple - eliminates need for separate positive supply and reduces board area by 40%. | Use Scenario: Photomultiplier tube (PMT) bias supply requiring 100V@75mA from 15V input. IC Role / Device Role / Timing Role: Voltage-boosted boost controller; leverages LT1072CS8#TRPBF's 60V switch rating with external MOSFET drive stage. Use Value: Enables 100V output with <0.5% line regulation - meets PMT gain stability requirements over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3873EMS#TRPBF | Current-mode synchronous buck controller (no integrated switch); 4–36V input; 500kHz max freq; requires external MOSFETs. | Targeted at higher-efficiency (>92%), higher-current (>5A) buck designs where thermal management justifies external FETs. | Select LTC3873EMS#TRPBF when efficiency >90% and output current >2A are mandatory; LT1072CS8#TRPBF remains optimal for <20W isolated or inverting topologies with minimal BOM. |
| LM2596S-ADJ/NOPB | Fixed-frequency (150kHz) buck-only regulator; 4.5–40V input; 3A switch; 1.23V reference; no flyback or inverting support. | Designed exclusively for step-down conversion; lacks multi-topology flexibility and isolated regulation capability. | Choose LM2596S-ADJ/NOPB for cost-sensitive, non-isolated 3.3V/5V/12V buck supplies; LT1072CS8#TRPBF is required for flyback, inverting, or wide-input-range applications. |
Compared with LTC3873EMS#TRPBF and LM2596S-ADJ/NOPB, the LT1072CS8#TRPBF uniquely supports six switching topologies in one IC, includes flyback regulation for isolation, and operates down to 3V input - making it irreplaceable for compact, multi-rail, or safety-isolated power designs where BOM count and layout space are constrained.
Availability
LT1072CS8#TRPBF is available at Aetrix Electronics and suitable for industrial offline converters, battery-powered boost supplies, negative-to-positive inverters, and high-voltage bias generators requiring stable component supply and long-term production continuity.
Supply support for LT1072CS8#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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application notes for legacy Linear parts including the LT1072 family.
The LT1072 product line was engineered for high-power-density, multi-topology DC/DC regulation in industrial, telecom, and instrumentation systems - emphasizing integration, isolation capability, and ruggedness across wide input ranges.
FAQ
What is the maximum input voltage rating for LT1072CS8#TRPBF?
The LT1072CS8#TRPBF has an absolute maximum switch breakdown voltage of 60V and a recommended maximum input voltage of 60V. Operation above 40V in buck or inverting modes requires external current limiting due to minimum "on" time constraints (~0.7µs), but flyback, boost, and forward topologies support full 60V input without modification.
Can LT1072CS8#TRPBF generate isolated outputs without an optocoupler?
Yes. When the FB pin is pulled below 0.54V, the LT1072CS8#TRPBF enters flyback regulation mode and uses its internal 16.3V flyback reference to regulate the amplitude of the transformer's reflected flyback pulse - enabling fully floating, optocoupler-free isolated outputs up to the transformer's breakdown rating.
How does the dual-emitter (E1/E2) configuration affect LT1072CS8#TRPBF performance?
The LT1072CS8#TRPBF's E1 (mandatory) and E2 (optional) pins allow external adjustment of switch current limit: leaving E2 unconnected halves the effective current limit (to ~0.625A) and doubles RDS(on), reducing overload dissipation but increasing conduction loss at full load - a trade-off useful for fault-tolerant designs.
What is the purpose of the VC pin on LT1072CS8#TRPBF beyond error amplification?
The VC pin on LT1072CS8#TRPBF serves four critical functions: (1) error amplifier output for loop compensation, (2) current limit setting (0–2V range), (3) soft-start initiation (via capacitor clamp), and (4) shutdown trigger (<0.15V). Pulling VC to ground disables switching and reduces supply current to 50µA - essential for low-power standby modes.
Is LT1072CS8#TRPBF compatible with external clock synchronization?
Yes. The LT1072CS8#TRPBF supports external synchronization from 48kHz to 70kHz by pulling the VC pin to ground with a narrow (<1µs) pulse. This enables EMI reduction through frequency dithering or phase interleaving in multi-regulator systems - confirmed in Linear Technology Application Note AN-19.
LT1072CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, Cuk, Flyback, Forward Converter
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 60V (Switch)
- Current - Output:
- 1.25A (Switch)
- Frequency - Switching:
- 40kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 100°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1072CS8#TRPBF FAQ
1.How can I place an order for LT1072CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1072CS8#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 LT1072CS8#TRPBF reliable?
The price and inventory of LT1072CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1072CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1072CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1072CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1072CS8#TRPBF?
LT1072CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1072CS8#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 LT1072CS8#TRPBF?
For technical support, including LT1072CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1072CS8#TRPBF requirements.
6.How does Aetrix verify that LT1072CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1072CS8#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 LT1072CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1072CS8#TRPBF?
All LT1072CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1072CS8#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 LT1072CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1072CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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