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Analog Devices Inc. LT1373IS8#TRPBF
- Part No.:
- LT1373IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1373IS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,654
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Product details
Overview
LT1373IS8#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 conversion.
For engineers reviewing the LT1373IS8#TRPBF datasheet, LT1373IS8#TRPBF pinout, LT1373IS8#TRPBF application, or LT1373IS8#TRPBF equivalent, key selection criteria include its 1mA quiescent current at 250kHz, ±1.245V/–2.45V dual-reference architecture, 12µA shutdown current, 8-pin SOIC package, and compatibility with small 15µH inductors for space-constrained laptop and portable power designs.
Technical Context
The LT1373IS8#TRPBF implements constant-frequency current-mode control with internal 250kHz oscillator, nonlinear error amplifier transconductance (250–600 µmho), and adaptive anti-saturation driver logic. Its VC pin serves as error amplifier output, current limit control, and soft-start node, while FB and NFB pins enable independent regulation of positive (1.245V reference) and negative (–2.45V reference) outputs.
It integrates a 35V-rated 1.5A switch with 0.5Ω typical RDS(on), 12µs resettable shutdown delay, and oscillator frequency shifting (5:1 reduction under overload). Thermal design uses θJA = 120°C/W for the S8 package, supporting operation from –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 250kHz typical; enables use of compact 15µH inductors and reduces EMI filtering burden. |
| Supply Current (IQ) | 1mA typical at 250kHz; cuts standby power in battery-powered systems like laptops. |
| Shutdown Current | 12µA typical; extends battery life during system sleep modes. |
| Output Switch Current Limit | 1.5A minimum; supports up to ~0.35A output in 5V-to-12V boost with 15µH inductor. |
| Input Voltage Range | 2.7V to 25V; allows direct operation from single Li-ion or multi-cell alkaline supplies. |
| Reference Voltages | +1.245V (FB) and –2.45V (NFB); enables precise dual-polarity regulation without external references. |
| Package | 8-pin SOIC (S8); surface-mount compatible, 120°C/W thermal resistance, RoHS-compliant. |
Pinout & Package
LT1373IS8#TRPBF is housed in an 8-pin plastic SOIC (S8) package with exposed pad not present; JEDEC MS-012AC compliant, 120°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output / compensation node | Controls duty cycle via current comparator; used for RC compensation, soft-start, and current limit clamping. |
| FB (Pin 2) | Positive feedback input | Connects to resistor divider for +VOUT regulation; referenced to 1.245V internal bandgap. |
| NFB (Pin 3) | Negative feedback input | Connects to resistor divider for –VOUT regulation; referenced to –2.45V internal amplifier output. |
| S/S (Pin 4) | Shutdown & synchronization input | Logic-level active-low shutdown (1.3V threshold); accepts 300–340kHz sync signal for EMI reduction. |
| VIN (Pin 5) | Main supply input | Accepts 2.7–25V; includes undervoltage lockout below ~2.5V. |
| GND S (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 | Carries high pulsed currents from internal switch; requires low-inductance connection to ground plane. |
| VSW (Pin 8) | Switch collector output | Drives external inductor/diode; high dv/dt node requiring short, low-loop-area routing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-reference regulation | Simultaneous +1.245V (FB) and –2.45V (NFB) references enable true bipolar output control without external op-amps. |
| Nonlinear transconductance | Error amplifier gm increases 10× when FB exceeds VREF by 40mV, reducing output overshoot during startup and load recovery. |
| Oscillator frequency shifting | Reduces switching frequency 5:1 when FB < 0.6V, lowering peak switch current and protecting components during overload. |
| External synchronization | Accepts 300–340kHz logic-level sync signal on S/S pin to align switching with system clocks and reduce beat frequencies. |
| Low-ESR capacitor tolerance | Designed for solid tantalum output caps (e.g., AVX TPS series, 0.1–0.3Ω ESR); avoids instability issues common with ceramic capacitors. |
Applications
| Laptop Computer Power Supply | CCFL Backlight Driver |
|---|---|
Use Scenario: Generating 12V/0.35A from 5V USB-C or main battery rail for display backlight and peripheral rails. IC Role / Device Role / Timing Role: Primary DC-DC boost controller with integrated 1.5A switch and current-mode PWM timing. Use Value: 1mA quiescent current extends battery runtime; 250kHz operation allows <0.6 in² board area using 15µH inductor and surface-mount passives. | Use Scenario: Driving cold-cathode fluorescent lamp (CCFL) inverters requiring stable high-voltage AC output. IC Role / Device Role / Timing Role: High-efficiency flyback controller providing regulated high-voltage DC bus for external inverter stage. Use Value: Dual-reference capability enables precise regulation of both positive and negative auxiliary rails needed for CCFL bias and gate drive. |
| Inverting Power Supply | Multiple-Output Flyback Supply |
Use Scenario: Generating –5V at 0.5A from 3–9V input in portable instrumentation or audio circuits. IC Role / Device Role / Timing Role: Inverting topology controller using NFB pin for direct negative output sensing and regulation. Use Value: Eliminates need for external inverting op-amp or charge pump; –2.45V NFB reference ensures ±1% output accuracy over temperature. | Use Scenario: Providing isolated +15V and –15V outputs from 4.75–13V input in industrial sensor interfaces. IC Role / Device Role / Timing Role: Dual-polarity flyback controller regulating both outputs simultaneously via FB and NFB pins. Use Value: Prevents unregulated overvoltage on either rail under mismatched loading; maintains tight cross-regulation without optocouplers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1372CS8#TRPBF | 500kHz switching, 4mA IQ, same pinout and topology support but higher quiescent current and lower efficiency at light loads. | Better suited for space-constrained designs needing higher frequency; less optimal for battery life-critical applications. | Select LT1372CS8#TRPBF only when 500kHz operation is required to shrink magnetics beyond what 250kHz allows. |
| LM2733YSD/NOPB | 600kHz fixed-frequency, 2.1A switch, 2.7–5.5V input range only, no NFB pin or negative output capability. | Limited to low-input-voltage boost; cannot regulate negative outputs or operate below 2.7V with margin. | Choose LM2733YSD/NOPB for cost-sensitive 3.3V/5V boost where dual polarity and wide VIN are unnecessary. |
Compared with LT1372CS8#TRPBF, LT1373IS8#TRPBF trades higher-frequency flexibility for 75% lower IQ and superior light-load efficiency; versus LM2733YSD/NOPB, it offers wider input range, bipolar regulation, and proven reliability in industrial temperature grades.
Availability
LT1373IS8#TRPBF is available at Aetrix Electronics and suitable for laptop computer supplies, CCFL backlight drivers, inverting power supplies, and multiple-output flyback supplies requiring stable component supply across industrial temperature ranges.
Supply support for LT1373IS8#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, documentation, and manufacturing continuity for legacy Linear parts including the LT1373 family.
The LT1373 product line was engineered for high-efficiency, low-quiescent-current DC-DC conversion in portable and space-constrained systems, emphasizing dual-polarity regulation, wide input voltage range, and robust thermal performance in SOIC packaging.
FAQ
What is the maximum output current achievable with the LT1373IS8#TRPBF in a boost configuration?
The LT1373IS8#TRPBF features a 1.5A internal switch with current limiting. In a typical 5V-to-12V boost converter using a 15µH inductor, it delivers up to 0.35A continuous output current. Peak switch current depends on input/output voltage ratio, inductor value, and duty cycle - design must ensure peak current stays below 1.5A under worst-case conditions. Derating is recommended for thermal reliability at elevated ambient temperatures.
Does the LT1373IS8#TRPBF support negative output voltage regulation?
Yes, the LT1373IS8#TRPBF directly supports negative output regulation via its dedicated NFB (Negative Feedback) pin, which references an internal –2.45V threshold. When configured with an appropriate resistor divider on the NFB pin, it regulates negative outputs such as –5V or –15V without external op-amps or level shifters. The FB pin must remain open in pure negative-output applications.
What is the purpose of the VC pin on the LT1373IS8#TRPBF?
The VC (Compensation) pin on the LT1373IS8#TRPBF serves three critical functions: it is the output of the error amplifier, the input to the current comparator, and the node for loop compensation. An RC network from VC to ground sets loop stability; clamping VC externally adjusts current limit; and coupling a capacitor to VC provides soft-start. Its voltage ranges from ~1.0V (light load) to ~1.9V (heavy load).
Can the LT1373IS8#TRPBF be synchronized to an external clock?
Yes, the LT1373IS8#TRPBF supports external synchronization via its S/S (Shutdown/Sync) pin. Applying a logic-level square wave between 300kHz and 340kHz to this pin synchronizes the internal 250kHz oscillator, enabling EMI reduction and noise cancellation in multi-rail systems. The part includes a 12µs resettable delay to prevent false shutdown during sync transitions.
What package type and temperature grade does the LT1373IS8#TRPBF have?
The LT1373IS8#TRPBF is packaged in an 8-pin plastic SOIC (S8) with industry-standard MS-012AC footprint and is rated for the Industrial temperature range of –40°C to +125°C junction temperature. Its θJA is 120°C/W, and it carries the "I" grade suffix indicating guaranteed performance across this extended range.
LT1373IS8#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):
- 35V (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
LT1373IS8#TRPBF FAQ
1.How can I place an order for LT1373IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1373IS8#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 LT1373IS8#TRPBF reliable?
The price and inventory of LT1373IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1373IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1373IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1373IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1373IS8#TRPBF?
LT1373IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1373IS8#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 LT1373IS8#TRPBF?
For technical support, including LT1373IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1373IS8#TRPBF requirements.
6.How does Aetrix verify that LT1373IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1373IS8#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 LT1373IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1373IS8#TRPBF?
All LT1373IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1373IS8#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 LT1373IS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1373IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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