My Inquiry
My Account
Analog Devices Inc. LT1373HVIN8#PBF
- Part No.:
- LT1373HVIN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1373HVIN8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,343
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1373HVIN8#PBF 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 operates from 2.7V to 30V input, delivers up to 1.5A switch current, regulates both positive and negative outputs, and features 1mA quiescent current and 12µA shutdown current. It is used in laptop computer supplies, CCFL backlight drivers, and multiple-output flyback converters.
For engineers reviewing the LT1373HVIN8#PBF datasheet, LT1373HVIN8#PBF pinout, LT1373HVIN8#PBF application, or LT1373HVIN8#PBF equivalent, key selection criteria include its HV-rated 42V switch breakdown voltage, dual feedback architecture (FB/NFB), 250kHz fixed-frequency operation, soft-start via VC pin, and compatibility with small inductors (e.g., 15µH) in space-constrained designs.
Technical Context
The LT1373HVIN8#PBF 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 dual feedback architecture supports independent regulation of positive (via FB pin, 1.245V reference) and negative (via NFB pin, –2.45V reference) outputs without external amplifiers.
It integrates a 42V-rated 1.5A power switch with 0.5Ω typical RDS(on), 85–95% maximum duty cycle, and built-in protection including undervoltage lockout (2.5V threshold), thermal shutdown, and oscillator frequency shifting during overload. The VC pin serves triple function: error amplifier output, compensation node, and soft-start/limit control point.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 250 kHz nominal; enables use of compact 15–22 µH inductors and reduces EMI filtering burden. |
| Input Voltage Range | 2.7 V to 30 V; supports single-cell Li-ion (2.7V min) and industrial 24V rails with margin. |
| Switch Breakdown Voltage | 42 V (HV version); allows safe operation with 36V transient surges in automotive or industrial inputs. |
| Output Switch Current Limit | 1.5 A typical; sets peak inductor current limit in boost/flyback, constraining max continuous load. |
| Quiescent Current | 1 mA typical at 250 kHz; enables high light-load efficiency in battery-powered systems. |
| Shutdown Current | 12 µA typical; extends battery life in standby mode without external disconnect circuitry. |
| Reference Voltage (FB) | 1.245 V ±15 mV; defines precision output setpoint for positive regulators using standard resistor dividers. |
| Negative Reference (NFB) | –2.45 V ±60 mV; enables direct negative output regulation without external op-amps or level shifters. |
Pinout & Package
LT1373HVIN8#PBF is housed in an 8-lead PDIP (N8) package with 100°C/W junction-to-ambient thermal resistance. Pin assignments are validated per Linear Technology's official datasheet (Rev. D, p.5).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output / compensation node | Controls switch current limit and soft-start; RC network here sets loop stability and start-up slew rate. |
| FB (Pin 2) | Positive output voltage sense input | Connects to resistor divider for +VOUT regulation; referenced to 1.245 V internal bandgap. |
| NFB (Pin 3) | Negative output voltage sense input | Connects to resistor divider for –VOUT regulation; referenced to –2.45 V internal amplifier. |
| S/S (Pin 4) | Shutdown & synchronization input | Logic-low (<1.3 V) enables shutdown (12 µA IQ); 300–340 kHz AC signal synchronizes switching. |
| VIN (Pin 5) | Main power supply input | Accepts 2.7–30 V; requires ≥10 µF bypass capacitor; triggers UVLO below 2.5 V. |
| GND S (Pin 6) | Clean analog ground reference | Reference for internal bandgap, error amp, and NFB amp; must be isolated from high-current GND paths. |
| GND (Pin 7) | Power switch emitter return | Carries full switch current; must connect directly to low-impedance ground plane to minimize noise. |
| VSW (Pin 8) | Power switch collector output | Drives external inductor/diode; high di/dt node requiring shortest possible PCB trace routing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity regulation | Single IC regulates both +VOUT (via FB) and –VOUT (via NFB) without external op-amps or level shifters. |
| High-voltage switch | 42 V breakdown rating enables robust operation in 24 V industrial or 36 V automotive transient environments. |
| Low-light-load IQ | 1 mA operating current at 250 kHz improves battery runtime in always-on portable applications. |
| External sync & shutdown | Single S/S pin provides logic-compatible enable/disable and precise clock synchronization to external sources. |
| Nonlinear transconductance | Error amplifier gm increases 10× above 40 mV over-reference, reducing output overshoot during startup or load recovery. |
| Oscillator frequency shift | Switching frequency drops 5:1 when FB < 0.6 V, limiting peak switch current during overload or short-circuit conditions. |
Applications
| CCFL Backlight Driver | Laptop Computer Supply |
|---|---|
Use Scenario: Driving cold cathode fluorescent lamps in notebook displays requiring regulated high-voltage AC output. IC Role / Device Role / Timing Role: Configured as boost converter with transformer coupling; LT1373HVIN8#PBF controls switch timing and current to generate stable lamp current. Use Value: 250 kHz switching enables compact magnetics; 1.5A switch handles lamp strike currents; HV rating withstands lamp open-circuit transients. | Use Scenario: Generating 5 V, 12 V, or –5 V rails from a 3.3 V or 5 V main battery supply in ultraportable laptops. IC Role / Device Role / Timing Role: Used in inverting or boost topology to create auxiliary rails; LT1373HVIN8#PBF manages regulation, sequencing, and efficiency across varying loads. Use Value: Dual feedback supports simultaneous +12 V and –5 V generation; 1 mA IQ extends battery life during sleep states; small board footprint (<0.6 in²) saves space. |
| Multiple-Output Flyback Supply | Inverting DC-DC Converter |
Use Scenario: Providing isolated +15 V and –15 V outputs for op-amp biasing or data acquisition front-ends in industrial PLCs. IC Role / Device Role / Timing Role: LT1373HVIN8#PBF acts as primary-side controller in flyback topology, regulating both outputs via dual feedback (FB + NFB pins). Use Value: Prevents either output from overvoltage at no-load; eliminates need for secondary-side optocouplers or TL431 references; simplifies BOM and layout. | Use Scenario: Converting +5 V USB power to –3 V or –5 V for legacy RS-232 interface or sensor biasing in IoT edge devices. IC Role / Device Role / Timing Role: LT1373HVIN8#PBF configured in inverting topology; NFB pin directly senses negative output while maintaining simple compensation. Use Value: Eliminates external inverting op-amp stage; 2.7 V minimum input supports single Li-ion cell operation; 12 µA shutdown enables ultra-low-power wake-on-event designs. |
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 500 kHz frequency, higher 3.5 A switch current, no NFB pin, requires external compensation. | Optimized for high-current boost/buck; lacks native negative output regulation capability. | Select when >1.5 A output current or higher switching frequency is required; not suitable for dual-polarity designs without added components. |
| LM5122MMX/NOPB | 42 V input, 3 A switch, current-mode, but only positive feedback (no NFB pin); requires external op-amp for negative outputs. | Targeted at high-efficiency industrial DC-DC; no integrated negative regulation path. | Choose for higher power density where negative rail is generated separately; adds complexity vs. LT1373HVIN8#PBF's monolithic dual-feedback design. |
Compared with LTC3872EMS#TRPBF and LM5122MMX/NOPB, the LT1373HVIN8#PBF uniquely integrates dual-polarity regulation in a single 8-pin package with ultra-low 1 mA quiescent current-making it optimal for space- and power-constrained multi-rail portable systems where negative voltage generation must be simple and efficient.
Availability
LT1373HVIN8#PBF is available at Aetrix Electronics and suitable for laptop computer supplies, CCFL backlight drivers, and multiple-output flyback supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for LT1373HVIN8#PBF 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 engineering for legacy Linear parts including the LT1373 family.
The LT1373 product line was designed for high-efficiency, low-quiescent-current DC-DC conversion in portable and space-constrained systems, emphasizing flexibility across topologies (boost, buck, flyback, inverting) and dual-polarity output capability.
FAQ
What is the maximum input voltage rating for the LT1373HVIN8#PBF?
The LT1373HVIN8#PBF has a 42 V switch breakdown voltage rating, allowing safe operation with input voltages up to 30 V and transient surges up to 42 V. This HV rating distinguishes it from the standard LT1373 (35 V switch), making it suitable for 24 V industrial or automotive-derived supplies where load dump transients occur. Absolute maximum VIN is 30 V per datasheet specifications.
Can the LT1373HVIN8#PBF regulate both positive and negative outputs simultaneously?
Yes, the LT1373HVIN8#PBF can regulate both positive and negative outputs simultaneously using its dual feedback architecture: the FB pin senses positive outputs (referenced to 1.245 V), and the NFB pin senses negative outputs (referenced to –2.45 V). In dual-output flyback configurations, the LT1373HVIN8#PBF prevents either rail from overvoltage at no-load by actively regulating both, eliminating the need for secondary-side optocouplers or additional control ICs.
What is the purpose of the VC pin on the LT1373HVIN8#PBF?
The VC pin on the LT1373HVIN8#PBF serves three critical functions: it is the output of the error amplifier, the node for frequency compensation (via external RC network), and the control point for soft-start and current limit adjustment. During operation, VC voltage ranges from ~1.0 V (light load) to ~1.9 V (heavy load); clamping this pin externally allows programmable current limiting or controlled start-up ramp rates, directly shaping converter behavior without modifying feedback dividers.
How does the LT1373HVIN8#PBF achieve low quiescent current?
The LT1373HVIN8#PBF achieves 1 mA typical quiescent current through optimized internal biasing, low-power oscillator design, and efficient current-mode control architecture. Its 250 kHz switching frequency-lower than the 500 kHz LT1372-reduces dynamic losses, while integrated low-dropout 2.3 V regulator powers internal circuitry efficiently across the 2.7–25 V input range. In shutdown mode, the LT1373HVIN8#PBF draws only 12 µA, enabling extended battery life in portable applications.
Is the LT1373HVIN8#PBF pin-compatible with other LT1373 variants?
Yes, the LT1373HVIN8#PBF shares identical 8-pin PDIP (N8) pinout and electrical functionality with all other LT1373 variants (e.g., LT1373CN8, LT1373IS8), differing only in voltage rating (HV vs. standard), temperature grade (I-grade = –40°C to 125°C), and package type (PDIP vs. SO). The "HV" suffix denotes the 42 V switch rating, while "I" denotes industrial temperature range; both are fully interchangeable in layout and schematic design where voltage and temp requirements align.
LT1373HVIN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1373HVIN8#PBF FAQ
1.How can I place an order for LT1373HVIN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1373HVIN8#PBF 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 LT1373HVIN8#PBF reliable?
The price and inventory of LT1373HVIN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1373HVIN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1373HVIN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1373HVIN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1373HVIN8#PBF?
LT1373HVIN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1373HVIN8#PBF 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 LT1373HVIN8#PBF?
For technical support, including LT1373HVIN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1373HVIN8#PBF requirements.
6.How does Aetrix verify that LT1373HVIN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1373HVIN8#PBF 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 LT1373HVIN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1373HVIN8#PBF?
All LT1373HVIN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1373HVIN8#PBF, 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 LT1373HVIN8#PBF part is unused and in its original packaging.
Return procedure for LT1373HVIN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1373HVIN8#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
