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Analog Devices Inc. LT1373HVCS8#TRPBF
- Part No.:
- LT1373HVCS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1373HVCS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,594
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Product details
Overview
LT1373HVCS8#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode switching regulator IC designed for boost, flyback, inverting, and Cuk topologies. It integrates a 1.5A power switch, 250kHz oscillator, error amplifier with nonlinear transconductance, and dual feedback capability for ± output regulation. It operates down to 2.7V input and delivers up to 1.5A switch current in an 8-pin SOIC package - used in laptop supplies, CCFL backlight drivers, and multi-output flyback converters.
For engineers reviewing the LT1373HVCS8#TRPBF datasheet, LT1373HVCS8#TRPBF pinout, LT1373HVCS8#TRPBF application, or LT1373HVCS8#TRPBF equivalent, key selection criteria include its 42V switch breakdown voltage, 1mA quiescent current at 250kHz, ±2.45V dual-reference architecture, shutdown current of 12µA, and compatibility with small 15µH inductors in space-constrained DC/DC designs.
Technical Context
The LT1373HVCS8#TRPBF implements constant-frequency current-mode control with pulse-by-pulse current limiting and adaptive anti-saturation driver logic. Its error amplifier features nonlinear transconductance (250–600 µmho) that increases tenfold above 40mV FB deviation to suppress startup/overload overshoot.
It supports dual feedback modes: positive output regulation via FB pin (1.245V reference) and negative output regulation via NFB pin (–2.45V reference), both referenced to GND S. The S/S pin provides logic-compatible shutdown and synchronization within 300–340kHz range, while VC pin enables frequency compensation, soft-start, and current limit adjustment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Breakdown Voltage | 42V - Enables operation with ≥36V input rails or transient-tolerant flyback designs. |
| Quiescent Current | 1mA typical at 250kHz - Reduces no-load power loss in battery-powered systems. |
| Switch Current Limit | 1.5A minimum - Sets peak inductor current ceiling for reliable 0.35A+ continuous output in boost configurations. |
| Reference Voltage | +1.245V (FB) / –2.45V (NFB) - Allows precise positive or negative output setting without external references. |
| Shutdown Current | 12µA typical - Supports ultra-low-power sleep states in portable electronics. |
| Minimum Input Voltage | 2.7V - Permits direct operation from single Li-ion or triple-AA battery stacks. |
| Switching Frequency | 250kHz nominal - Balances efficiency, EMI, and inductor size; supports 15µH standard inductors. |
| Error Amp Transconductance | 375µmho typical - Determines loop gain stability margin and transient response speed. |
Pinout & Package
LT1373HVCS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package with θJA = 120°C/W, rated for operation from –40°C to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation & Control Output | Error amplifier output; sets current limit threshold and enables soft-start via external RC clamp. |
| FB (Pin 2) | Positive Feedback Input | Inverting input for +VOUT regulation; referenced to 1.245V internal bandgap. |
| NFB (Pin 3) | Negative Feedback Input | Connects to –VOUT divider via 400kΩ internal source resistor; regulates at –2.45V. |
| S/S (Pin 4) | Shutdown/Synchronization | Logic-level input: low = 12µA shutdown; AC-coupled 300–340kHz signal synchronizes switching. |
| VIN (Pin 5) | Power Input | Supplies internal 2.3V LDO; UVLO triggers below 2.5V to prevent erratic operation. |
| GND S (Pin 6) | Clean Reference Ground | Reference node for FB/NFB amplifiers and internal 1.245V/–2.45V references; isolate from power ground currents. |
| GND (Pin 7) | Power Switch Emitter | High-current return path for 1.5A switch; must connect directly to low-impedance ground plane. |
| VSW (Pin 8) | Switch Collector | High dv/dt node connecting to inductor/diode; requires shortest possible PCB trace to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Dual polarity regulation | Single IC regulates +VOUT (via FB) or –VOUT (via NFB) without external references or op-amps. |
| Nonlinear error amp gm | Transconductance jumps 10× when FB deviates >40mV - reduces output overshoot during startup or load recovery. |
| Oscillator frequency shift | Reduces switching frequency 5:1 when FB < 0.6V - maintains control during overload by lowering minimum duty cycle. |
| Adaptive anti-saturation driver | Detects onset of switch saturation in real time and adjusts drive current - minimizes turn-off delay and driver dissipation. |
| External synchronization | S/S pin accepts 300–340kHz logic-level signal - enables noise-sensitive systems to avoid EMI bands or align multiple regulators. |
| Low minimum supply voltage | Operates from 2.7V - supports direct connection to partially discharged Li-ion cells or low-voltage industrial rails. |
Applications
| Laptop Computer Power Supply | CCFL Backlight Driver |
|---|---|
Use Scenario: Generating 12V/0.35A from 5V USB-C or 3-cell Li-ion input in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary current-mode boost controller managing inductor current, output voltage regulation, and soft-start sequencing. Use Value: 1mA quiescent current extends battery runtime; 250kHz switching allows compact 15µH inductor and <0.6 in² board area. | Use Scenario: Driving cold-cathode fluorescent lamps requiring stable 600–1000V AC with regulated current in LCD monitors. IC Role / Device Role / Timing Role: Flyback controller regulating high-voltage secondary output via optocoupler feedback to FB pin. Use Value: 42V switch rating accommodates reflected flyback voltages; frequency shift protects lamp circuitry during arc faults. |
| Multiple Output Flyback Supply | Inverting DC/DC Converter |
Use Scenario: Simultaneously generating +15V and –15V outputs from 12V input in industrial I/O modules. IC Role / Device Role / Timing Role: Dual-feedback flyback controller using both FB and NFB pins to regulate independent positive/negative rails. Use Value: Prevents unregulated overvoltage on either rail under mismatched loading; eliminates need for secondary-side regulators. | Use Scenario: Converting 5V logic rail to –3V analog bias supply in mixed-signal sensor interfaces. IC Role / Device Role / Timing Role: Inverting topology controller using NFB pin to regulate negative output with precision –2.45V reference. Use Value: Eliminates external op-amp and reference; achieves ±1% output accuracy with standard resistor dividers. |
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 | Fixed 500kHz frequency, no NFB pin, requires external MOSFET, higher IQ (2.5mA) | Optimized for high-efficiency synchronous buck; lacks native negative output support | Select when higher switching frequency and synchronous rectification are required, and negative output is not needed. |
| TPS61088RHLR | Integrated 12A switch, 2.7–12V input, 1.2MHz fixed frequency, no dual-reference capability | Targeted at high-current boost for USB PD and display power; no inverting/flyback support | Choose for >2A output current and minimal BOM count where topology flexibility is secondary. |
Compared with LTC3872EMS#TRPBF and TPS61088RHLR, the LT1373HVCS8#TRPBF uniquely supports inverting, flyback, and Cuk topologies with integrated 1.5A switch and dual ± reference architecture - making it optimal for space-constrained, multi-rail, or high-voltage-tolerant DC/DC designs where flexibility and low IQ matter more than peak current or MHz switching.
Availability
LT1373HVCS8#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 LT1373HVCS8#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 technical and manufacturing continuity for legacy Linear power products.
The LT1373HVCS8#TRPBF belongs to Linear's high-voltage current-mode switching regulator family, engineered for flexible topology support (boost/flyback/inverting/Cuk), low-quiescent-current operation, and robust dual-polarity regulation in portable and industrial power systems.
FAQ
What is the maximum input voltage rating for the LT1373HVCS8#TRPBF?
The LT1373HVCS8#TRPBF has a maximum supply voltage rating of 30V on the VIN pin and a 42V switch breakdown voltage (BVSW) for the VSW pin. This allows safe operation with input rails up to 30V and flyback reflected voltages up to 42V - distinguishing it from the standard LT1373 (35V switch rating). Always observe absolute maximum ratings in thermal and transient conditions.
Can the LT1373HVCS8#TRPBF regulate both positive and negative outputs simultaneously?
Yes, the LT1373HVCS8#TRPBF supports dual polarity regulation using both FB and NFB pins concurrently. In dual-output flyback applications, it prevents either rail from exceeding its setpoint - e.g., if the positive output sags under heavy load, the negative output remains regulated at –15V. However, FB pin loading must stay below 100µA when NFB is active to maintain accuracy.
What inductor value is recommended for a 5V-to-12V boost converter using the LT1373HVCS8#TRPBF?
The LT1373HVCS8#TRPBF datasheet specifies 15µH (Coilcraft D03316-153) or 22µH (Sumida CD75-220KC) for 5V-to-12V boost operation. A 15µH inductor enables compact layout (<0.6 in² total surface-mount area) and supports ≥0.35A output. Larger values reduce peak switch current and ripple but increase size and cost - select based on peak current margin relative to the 1.5A switch limit.
How does the LT1373HVCS8#TRPBF achieve low output overshoot during startup?
The LT1373HVCS8#TRPBF uses nonlinear error amplifier transconductance: gm increases tenfold when FB voltage exceeds the 1.245V reference by >40mV. This sharp gain boost accelerates loop response during transient events like startup or overload recovery, actively suppressing overshoot without requiring complex external compensation networks.
Is the LT1373HVCS8#TRPBF pin-compatible with other LT1373 variants like LT1373CS8?
Yes, the LT1373HVCS8#TRPBF shares identical 8-pin SOIC (S8) pinout and footprint with all LT1373 variants including LT1373CS8, LT1373IS8, and LT1373HVIS8. The "HV" suffix denotes the 42V switch rating, but electrical connections, timing behavior, and functional pin roles (VC, FB, NFB, S/S, etc.) are fully compatible - enabling drop-in replacement where higher voltage tolerance is required.
LT1373HVCS8#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1373HVCS8#TRPBF FAQ
1.How can I place an order for LT1373HVCS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1373HVCS8#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 LT1373HVCS8#TRPBF reliable?
The price and inventory of LT1373HVCS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1373HVCS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1373HVCS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1373HVCS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1373HVCS8#TRPBF?
LT1373HVCS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1373HVCS8#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 LT1373HVCS8#TRPBF?
For technical support, including LT1373HVCS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1373HVCS8#TRPBF requirements.
6.How does Aetrix verify that LT1373HVCS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1373HVCS8#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 LT1373HVCS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1373HVCS8#TRPBF?
All LT1373HVCS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1373HVCS8#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 LT1373HVCS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1373HVCS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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