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Analog Devices Inc. LT1372HVIS8#TRPBF
- Part No.:
- LT1372HVIS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1372HVIS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,668
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Product details
Overview
LT1372HVIS8#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 500kHz current-mode switching regulator IC in an 8-pin SOIC package, integrating a 1.5A power switch, oscillator, error amplifier, and protection circuitry. It supports boost, buck, flyback, inverting, and Cuk topologies, regulates both positive and negative outputs, and operates down to 2.7V input with 4mA quiescent current - ideal for space-constrained laptop supplies and dual-output flyback converters.
For engineers reviewing the LT1372HVIS8#TRPBF datasheet, LT1372HVIS8#TRPBF pinout, LT1372HVIS8#TRPBF application, or LT1372HVIS8#TRPBF equivalent, key selection considerations include its 500kHz fixed switching frequency, ±2.49V dual-reference architecture (FB/NFB), 42V switch breakdown rating (HV variant), 12µA shutdown current, and compatibility with small 4.7µH inductors in surface-mount designs.
Technical Context
The LT1372HVIS8#TRPBF implements peak-current-mode control with adaptive anti-saturation driver logic, enabling immediate line transient response and simplified loop compensation. Its error amplifier features nonlinear transconductance (700–2300 µmho) that increases tenfold above 40mV overdrive to suppress startup/overload overshoot.
It integrates dual feedback paths: FB pin referenced to +1.245V for positive output regulation and NFB pin referenced to –2.49V for negative output sensing, sharing one error amplifier core. The VC pin serves triple duty - compensation node, soft-start control point, and current-limit adjustment interface - with clamping thresholds at 0.25V (low) and 1.95V (high).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500 kHz typical; enables use of compact 4.7 µH inductors and reduces EMI filter size. |
| Output Switch Current Limit | 1.5 A typical; sets maximum deliverable load current in boost/buck configurations. |
| Input Voltage Range | 2.7 V to 25 V; supports single-cell Li-ion and multi-cell battery inputs without external LDO. |
| Quiescent Supply Current | 4 mA typical; minimizes no-load power loss in always-on portable systems. |
| Shutdown Supply Current | 12 µA typical; allows ultra-low-power sleep modes in battery-backed applications. |
| Switch Breakdown Voltage | 42 V (HV version); supports higher input rails or transient-tolerant industrial supplies. |
| Reference Voltage (FB) | +1.245 V ±1.2%; defines output voltage accuracy via resistor divider ratio. |
| Reference Voltage (NFB) | –2.490 V ±2.0%; enables direct negative output regulation without external op-amps. |
Pinout & Package
LT1372HVIS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package with standard 1.27 mm pitch, JEDEC MS-012AC compliant, thermal resistance θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation / Soft-start / Current limit control | Error amplifier output; RC network here sets loop stability; clamping controls soft-start ramp and current limit. |
| FB (Pin 2) | Positive output voltage sense | Inverting input of main error amp; tied internally to +1.245 V reference; sets VOUT = 1.245 × (1 + R1/R2). |
| NFB (Pin 3) | Negative output voltage sense | Inverting input of negative-feedback amp via 100 kΩ source resistor; regulates at –2.49 V; enables dual-polarity flyback. |
| S/S (Pin 4) | Shutdown & Synchronization | Logic-level input; <0.6 V activates 12 µA shutdown; 600–800 kHz AC signal synchronizes switching clock. |
| VIN (Pin 5) | Power input supply | Bypass with ≥10 µF capacitor; UVLO triggers below 2.5 V to prevent erratic operation. |
| GND S (Pin 6) | Clean analog ground reference | Reference for internal bandgap, error amps, and NFB path; must be isolated from high-current GND traces. |
| GND (Pin 7) | Power switch emitter return | High-current return path for 1.5 A switch; requires low-impedance connection to PCB ground plane. |
| VSW (Pin 8) | Switch collector node | High dv/dt node driving external inductor/diode; trace length must be minimized to reduce EMI and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-reference regulation | Simultaneous +1.245 V (FB) and –2.49 V (NFB) references enable single-IC dual-polarity output control without external amplifiers. |
| Current-mode control | Peak-current sensing provides inherent cycle-by-cycle overcurrent protection and eliminates need for slope compensation in most designs. |
| Nonlinear error amplifier transconductance | Transconductance jumps 10× when FB exceeds VREF by >40 mV, reducing output overshoot during startup and load recovery. |
| Adaptive anti-saturation driver | Real-time detection of switch saturation adjusts drive current to minimize conduction loss and ensure fast turn-off. |
| External synchronization | Accepts 600–800 kHz logic-level sync signal on S/S pin, enabling noise-sensitive systems to avoid critical EMI bands. |
| Low minimum input voltage | 2.7 V start-up capability supports single Li-ion (2.7–4.2 V) or 3.3 V system rail operation without pre-regulation. |
Applications
| Laptop Computer Power Supply | CCFL Backlight Driver |
|---|---|
Use Scenario: Generating 12 V from 5 V USB or 3.3 V system rail to power display backlight inverters in ultraportable notebooks. IC Role / Device Role / Timing Role: Boost regulator controlling MOSFET switch at 500 kHz; uses FB pin for output regulation and S/S pin for EMI-controlled sync. Use Value: Enables compact, low-profile design with <0.5 in² board area using 4.7 µH inductor and surface-mount capacitors. | Use Scenario: Driving cold-cathode fluorescent lamp (CCFL) strings requiring stable high-voltage AC output (e.g., 600–1000 VRMS) from low-voltage DC input. IC Role / Device Role / Timing Role: Flyback controller with integrated 1.5 A switch; NFB pin used for auxiliary winding feedback to regulate lamp current. Use Value: Eliminates need for external gate driver or current-sense amplifier; HV rating (42 V) accommodates reflected flyback spikes. |
| Multiple Output Flyback Supply | Inverting DC-DC Converter |
Use Scenario: Providing isolated +12 V and –12 V rails from 5 V input in industrial I/O modules with tight EMI limits. IC Role / Device Role / Timing Role: Dual-feedback flyback controller using both FB and NFB pins to regulate positive and negative secondaries independently. Use Value: Prevents unregulated overvoltage on unloaded outputs; avoids need for post-regulators or optocouplers on secondary side. | Use Scenario: Generating –5 V from +5 V rail for analog sensor biasing or op-amp dual supplies in medical instrumentation. IC Role / Device Role / Timing Role: Inverting topology regulator; NFB pin directly senses negative output; FB pin left open. Use Value: Achieves precise –5.00 V output (±1.2% via resistor tolerance) without external components beyond inductor and diode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3872EMS8#TRPBF | Fixed 500 kHz frequency, but requires external MOSFET; no integrated 1.5 A switch. | Used where higher efficiency (>92%) or adjustable frequency is required; not suitable for space-constrained layouts needing monolithic integration. | Select only if thermal budget allows discrete FET and board area permits larger solution size. |
| TPS61088RHLR | Higher 2.5 A switch current, 2.7–12 V input, but only supports positive output regulation (no NFB pin). | Preferred for single-output boost applications demanding >1.2 A load; cannot replace LT1372HVIS8#TRPBF in dual-polarity or inverting designs. | Choose when output polarity is exclusively positive and higher current capability is mandatory. |
Compared with LTC3872EMS8#TRPBF and TPS61088RHLR, the LT1372HVIS8#TRPBF uniquely combines monolithic 1.5 A switching, dual-polarity regulation, and 42 V HV rating in an 8-pin SOIC - making it irreplaceable in compact inverting or dual-output flyback systems where board area and component count are critical.
Availability
LT1372HVIS8#TRPBF is available at Aetrix Electronics and suitable for laptop computer supplies, CCFL backlight drivers, multiple-output flyback supplies, and inverting DC-DC converters requiring stable component supply across industrial temperature ranges (–40°C to 125°C).
Supply support for LT1372HVIS8#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 LT1372 series.
The LT1372 product line was designed specifically for high-efficiency, low-component-count DC-DC conversion in portable and space-constrained industrial equipment, emphasizing monolithic integration, wide input range, and flexible topology support.
FAQ
What is the maximum input voltage rating for the LT1372HVIS8#TRPBF?
The LT1372HVIS8#TRPBF has a maximum switch breakdown voltage of 42 V, distinguishing it from standard LT1372 variants rated at 35 V. This HV rating allows safe operation with higher input rails or transient-tolerant designs. Absolute maximum supply voltage (VIN) remains 30 V per datasheet specifications, and exceeding this risks permanent damage regardless of switch rating.
Can the LT1372HVIS8#TRPBF regulate both positive and negative outputs simultaneously?
Yes - the LT1372HVIS8#TRPBF supports simultaneous regulation of positive and negative outputs using its dual feedback architecture: the FB pin (referenced to +1.245 V) regulates the positive rail, while the NFB pin (referenced to –2.49 V) regulates the negative rail. In dual-output flyback configurations, both pins are active, and the IC prevents either output from exceeding its setpoint, eliminating need for secondary-side optocouplers or post-regulators.
What inductor value is recommended for a 5 V to 12 V boost converter using the LT1372HVIS8#TRPBF?
The LT1372HVIS8#TRPBF datasheet specifies a 4.7 µH inductor for 5 V-to-12 V boost operation (TA01 schematic). Coilcraft DO1608-472 and Sumida CD43-4R7 are validated alternatives. Inductor selection must account for peak current (≥1.5 A) and saturation margin; lower values increase ripple and stress the 1.5 A internal switch, while higher values reduce efficiency at light loads.
How does the LT1372HVIS8#TRPBF achieve low output overshoot during startup?
The LT1372HVIS8#TRPBF uses nonlinear error amplifier transconductance: when the FB pin voltage exceeds the 1.245 V reference by more than 40 mV, transconductance increases tenfold (from ~1500 µmho to ~15,000 µmho), sharply increasing control loop gain to suppress overshoot. This behavior is intrinsic to the die design and requires no external components - a key differentiator from voltage-mode controllers.
Is the LT1372HVIS8#TRPBF pin-compatible with other LT1372 variants like LT1372CS8 or LT1372IS8?
Yes - all LT1372 variants in the S8 (8-lead SOIC) package, including LT1372HVIS8#TRPBF, LT1372CS8, and LT1372IS8, share identical pinout, footprint, and electrical interface. Differences lie solely in temperature grade (Commercial/Industrial/HV) and switch breakdown rating (35 V vs 42 V), not pin function or layout. No PCB redesign is needed when upgrading to the HV version for improved transient robustness.
LT1372HVIS8#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:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1372HVIS8#TRPBF FAQ
1.How can I place an order for LT1372HVIS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1372HVIS8#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 LT1372HVIS8#TRPBF reliable?
The price and inventory of LT1372HVIS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1372HVIS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1372HVIS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1372HVIS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1372HVIS8#TRPBF?
LT1372HVIS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1372HVIS8#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 LT1372HVIS8#TRPBF?
For technical support, including LT1372HVIS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1372HVIS8#TRPBF requirements.
6.How does Aetrix verify that LT1372HVIS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1372HVIS8#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 LT1372HVIS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1372HVIS8#TRPBF?
All LT1372HVIS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1372HVIS8#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 LT1372HVIS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1372HVIS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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