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Analog Devices Inc. LT1373HVIS8#TRPBF
- Part No.:
- LT1373HVIS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1373HVIS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,634
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Product details
Overview
LT1373HVIS8#TRPBF from Analog Devices (formerly Linear Technology) is a 250kHz current-mode switching regulator IC with integrated 1.5A power switch, designed for boost, buck, flyback, inverting, and Cuk topologies. It delivers up to 1.5A switch current, operates down to 2.7V input, regulates both positive and negative outputs, and achieves >90% efficiency at 5V-to-12V boost. It is used in laptop computer supplies, CCFL backlight drivers, and multiple-output flyback converters.
For engineers reviewing the LT1373HVIS8#TRPBF datasheet, LT1373HVIS8#TRPBF pinout, LT1373HVIS8#TRPBF application, or LT1373HVIS8#TRPBF equivalent, key selection criteria include its 1.5A current-limited switch, 250kHz fixed-frequency operation, dual feedback capability (FB/NFB), shutdown current of 12µA, and SO-8 package compatibility with industrial temperature range (–40°C to 125°C).
Technical Context
The LT1373HVIS8#TRPBF implements constant-frequency current-mode control with internal 250kHz oscillator, nonlinear error amplifier transconductance (250–600 µmho), and adaptive anti-saturation logic for rapid switch turn-off. Its VC pin serves as error amplifier output, current limit control point, and soft-start node.
It supports dual feedback architecture: FB pin regulates positive outputs at 1.245V reference; NFB pin regulates negative outputs at –2.45V reference via 400kΩ internal source resistor. Synchronization is supported between 300–340kHz, and shutdown threshold is 0.6–2.0V with 5–100µs delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 250 kHz typical; enables use of compact 15–22 µH inductors and reduces EMI filtering burden. |
| Max Switch Current | 1.5 A guaranteed; defines peak load capability before current limiting engages. | Input Voltage Range | 2.7 V to 25 V; supports single-cell Li-ion (2.7V min) and wide-input industrial rails. |
| Quiescent Current | 1 mA typical; minimizes standby power loss in battery-powered systems. |
| Shutdown Current | 12 µA typical; enables ultra-low-power sleep mode for portable applications. |
| Reference Voltage | 1.245 V (FB), –2.45 V (NFB); enables precise regulation of both polarities without external references. |
| Operating Temp | –40°C to +125°C; qualified for industrial and extended-temperature embedded systems. |
Pinout & Package
LT1373HVIS8#TRPBF is housed in an 8-pin plastic SO (SOIC-8) package with exposed pad thermal enhancement (θJA = 120°C/W). Pin 6 (GNDS) provides clean reference ground for feedback and error amplifier; Pin 7 (GND) carries high-current return path for the internal switch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output / compensation node | Used for loop compensation (RC network), soft-start control, and current limit adjustment via external clamping. |
| FB (Pin 2) | Positive output voltage sense input | Inverting input of main error amplifier; referenced to 1.245 V internal bandgap; sets positive output via resistor divider. |
| NFB (Pin 3) | Negative output voltage sense input | Connected to inverting input of negative feedback amplifier via 400 kΩ resistor; regulates at –2.45 V reference. |
| S/S (Pin 4) | Shutdown & synchronization input | Logic-level compatible; low-active shutdown (≤0.6 V); accepts 300–340 kHz sync signal for EMI reduction. |
| VIN (Pin 5) | Main supply input | Accepts 2.7–25 V; includes undervoltage lockout (<2.5 V) to prevent erratic startup. |
| GNDS (Pin 6) | Clean analog ground reference | Reference point for internal reference, error amp, and NFB amp; must be isolated from high-current GND paths. |
| GND (Pin 7) | Power switch emitter return | High-current ground for internal 1.5 A switch; requires low-impedance connection to PCB ground plane. |
| VSW (Pin 8) | Switch collector output | Drives external inductor/diode; carries full switching current; demands short, low-inductance layout. |
Key Features
| Feature | Design Value |
|---|---|
| Dual polarity regulation | Single IC regulates both positive (via FB) and negative (via NFB) outputs - eliminates need for separate regulators in bipolar supplies. |
| Nonlinear transconductance | Error amplifier gm increases 10× when FB exceeds VREF by 40 mV - suppresses output overshoot during startup and overload recovery. |
| Oscillator frequency shifting | Reduces switching frequency 5:1 when FB < 0.6 V - maintains control under overload while protecting external components. |
| Adaptive anti-saturation logic | Detects onset of switch saturation in real time and adjusts driver current - ensures fast, low-loss turn-off and improves efficiency. |
| External synchronization | Accepts 300–340 kHz logic-level sync signal on S/S pin - enables deterministic EMI alignment across multiple converters. |
Applications
| CCFL Backlight Driver | Laptop Computer Supply |
|---|---|
Use Scenario: Driving cold cathode fluorescent lamps in notebook displays requiring stable high-voltage AC output. IC Role / Device Role / Timing Role: LT1373HVIS8#TRPBF operates in flyback configuration to generate ~600 VAC from 5 V DC input; uses frequency shifting to maintain lamp stability during dimming. Use Value: Integrated 1.5 A switch and 250 kHz operation enable compact transformer design; shutdown current <12 µA extends battery life during display-off periods. | Use Scenario: Generating regulated 12 V and –5 V rails from a 5 V or 3.3 V system bus in portable computing platforms. IC Role / Device Role / Timing Role: LT1373HVIS8#TRPBF implements dual-output inverting/flyback topology; FB regulates +12 V, NFB regulates –5 V independently. Use Value: Dual feedback architecture avoids cross-regulation errors; 1 mA quiescent current minimizes idle power draw in sleep states. |
| Multiple-Output Flyback Supply | Inverting Power Supply |
Use Scenario: Providing isolated +15 V and –15 V outputs for op-amp biasing and data acquisition front-ends in industrial instrumentation. IC Role / Device Role / Timing Role: LT1373HVIS8#TRPBF controls flyback transformer primary; FB and NFB pins monitor respective outputs to enforce tight regulation under dynamic loading. Use Value: Simultaneous dual feedback prevents unregulated overvoltage during no-load conditions; 125°C junction rating supports convection-cooled enclosures. | Use Scenario: Converting 5 V USB power into –3 V rail for legacy analog sensors or interface ICs requiring negative bias. IC Role / Device Role / Timing Role: LT1373HVIS8#TRPBF configured as inverting converter; NFB pin directly senses –3 V output; FB pin left open. Use Value: Eliminates need for external inverting charge pump or dual-supply IC; 2.7 V minimum input allows operation from partially discharged batteries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3872EMS#TRPBF | Higher 500 kHz switching frequency; 3.5 A switch; requires external MOSFETs; no integrated NFB architecture. | Optimized for high-density synchronous buck designs; lacks native negative output regulation. | Select when higher efficiency (>95%) and synchronous rectification are required; not drop-in for NFB-based inverting designs. |
| TPS61088RHLR | 5.5 A switch; 2.7–12 V input; 1.2 MHz fixed frequency; no NFB pin; only positive output regulation. | Targeted at high-current boost for USB PD and portable power banks; no native support for negative rails. | Choose for >2 A output current where negative voltage generation is handled separately; incompatible with dual-polarity feedback schemes. |
Compared with LTC3872EMS#TRPBF and TPS61088RHLR, the LT1373HVIS8#TRPBF uniquely integrates dual-polarity feedback, 1.5 A switch, and 250 kHz operation in an SO-8 package - making it optimal for space-constrained, bipolar-output industrial and portable systems where simplicity and temperature robustness are critical.
Availability
LT1373HVIS8#TRPBF is available at Aetrix Electronics and suitable for laptop computer supplies, CCFL backlight drivers, and multiple-output flyback supplies requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1373HVIS8#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 support for its legacy power management portfolio, including precision switching regulators with high integration and industrial-grade reliability.
The LT1373 family was designed specifically for compact, high-efficiency DC/DC conversion in portable and industrial equipment - emphasizing low quiescent current, dual-polarity regulation, and robust thermal performance in SO-8 packaging.
FAQ
What is the maximum input voltage rating for LT1373HVIS8#TRPBF?
The LT1373HVIS8#TRPBF has a maximum supply voltage rating of 30 V on the VIN pin. Its internal switch breakdown voltage is rated at 42 V (HV version), enabling safe operation with transient-tolerant input rails up to 25 V continuous. This makes LT1373HVIS8#TRPBF suitable for 24 V industrial systems with margin for line surges.
Does LT1373HVIS8#TRPBF support negative output voltage regulation?
Yes, LT1373HVIS8#TRPBF natively supports negative output regulation via its dedicated NFB (Negative Feedback) pin, which references an internal –2.45 V threshold. When the NFB pin is used with an appropriate resistor divider, LT1373HVIS8#TRPBF regulates negative outputs without external op-amps or level shifters - a key differentiator from most standard boost controllers.
What is the purpose of the VC pin on LT1373HVIS8#TRPBF?
On LT1373HVIS8#TRPBF, the VC (Compensation) pin serves three critical functions: it is the output of the error amplifier for loop compensation (via RC network), the node for adjusting current limit via external clamping, and the soft-start control point. Its voltage (typically 1.0–1.9 V) directly modulates switch duty cycle and enables precise transient response tuning.
Can LT1373HVIS8#TRPBF be synchronized to an external clock?
Yes, LT1373HVIS8#TRPBF supports external synchronization via its S/S (Shutdown/Sync) pin. A logic-level square wave between 300 kHz and 340 kHz applied to this pin overrides the internal 250 kHz oscillator, enabling deterministic EMI reduction and multi-converter phase alignment - all without modifying the LT1373HVIS8#TRPBF's core regulation behavior.
What is the thermal resistance (θJA) of LT1373HVIS8#TRPBF in its SO-8 package?
The LT1373HVIS8#TRPBF in the 8-lead plastic SO (S8) package has a junction-to-ambient thermal resistance (θJA) of 120°C/W under standard JEDEC 2-layer board conditions. This value assumes proper PCB copper pour under the exposed pad; actual thermal performance improves significantly with enhanced heatsinking or multilayer board layouts.
LT1373HVIS8#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, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.245V
- Voltage - Output (Max):
- 42V (Switch)
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 250kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1373HVIS8#TRPBF FAQ
1.How can I place an order for LT1373HVIS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1373HVIS8#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 LT1373HVIS8#TRPBF reliable?
The price and inventory of LT1373HVIS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1373HVIS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1373HVIS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1373HVIS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1373HVIS8#TRPBF?
LT1373HVIS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1373HVIS8#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 LT1373HVIS8#TRPBF?
For technical support, including LT1373HVIS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1373HVIS8#TRPBF requirements.
6.How does Aetrix verify that LT1373HVIS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1373HVIS8#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 LT1373HVIS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1373HVIS8#TRPBF?
All LT1373HVIS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1373HVIS8#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 LT1373HVIS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1373HVIS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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