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Analog Devices Inc. LT4430IS6#TRMPBF
- Part No.:
- LT4430IS6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT4430IS6#TRMPBF.pdf
- Description:
- IC OPTOCOUPLER GATE DRVR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:786
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Product details
Overview
LT4430IS6#TRMPBF from Analog Devices (formerly Linear Technology) is a secondary-side opto-coupler driver IC for isolated DC/DC power supplies. It integrates a 600mV ±0.75% initial-accuracy reference, 9MHz error amplifier, inverting −6× opto-driver with 10mA sourcing capability, and unique overshoot control circuitry using an external capacitor on the OC pin. It operates from 3V to 20V input and targets precision regulation in telecom and industrial offline converters.
For engineers reviewing the LT4430IS6#TRMPBF datasheet, LT4430IS6#TRMPBF pinout, LT4430IS6#TRMPBF application, or LT4430IS6#TRMPBF equivalent, key selection criteria include its ground-referenced opto-drive architecture, 48mV overshoot control offset, ±1.25% reference tolerance over temperature, short-circuit protected output, and TSOT-23-6 package compatibility with space-constrained isolated feedback designs.
Technical Context
The LT4430IS6#TRMPBF implements a voltage-mode error amplifier with 80dB open-loop DC gain and 9MHz unity-gain bandwidth, enabling stable loop compensation without phase shift at typical crossover frequencies. Its internal 600mV reference is trimmed and tied to the noninverting input of the error amplifier, while FB serves as the inverting input for external resistor-divider feedback.
Overshoot control is implemented via dedicated circuitry: an 8.5µA current source charges the OC pin capacitor, and during fault recovery, the OC amplifier pulls the OC node to FB + 48mV to ramp regulation smoothly. The opto-driver uses an inverting gain-of-6 stage referenced to GND, eliminating the need for a secondary-side shunt regulator like TL431.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 600mV ±0.75% initial accuracy; enables precise output voltage setting via R1/R2 divider (VOUT = 0.6V × (1 + R1/R2)) |
| Error Amplifier Bandwidth | 9MHz unity-gain bandwidth; allows simple RC compensation with negligible phase loss at 100kHz–500kHz loop crossover |
| Opto-Driver Output Current | 10.5mA max sourcing (E/I-grade); provides robust LED drive for standard opto-couplers under load and startup transients |
| Overshoot Control Offset | 48mV built-in offset between FB and OC during fault recovery; prevents interference during normal transients and ensures immediate regulation resumption |
| Input Voltage Range | 3V to 20V; supports biasing from wide-range isolated secondaries including 5V, 12V, 24V, and 48V systems |
| Operating Temperature | −40°C to +125°C junction; qualified for industrial and telecom power supply environments with derated lifetime above 125°C |
| Package | 6-lead TSOT-23 (1mm height); surface-mount compatible with high-density PCB layouts and automated assembly |
Pinout & Package
LT4430IS6#TRMPBF is housed in a 6-lead plastic TSOT-23 package (1mm profile), optimized for compact isolated feedback paths. Pin assignments are validated per Linear Technology's official pin configuration diagram and electrical characteristics table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power supply input | Accepts 3V–20V; powers all internal circuitry; requires 1µF bypass capacitor to GND for stability |
| GND (Pin 2) | Analog ground reference | Serves as negative sense terminal for 600mV reference; must connect external FB divider bottom directly here for accurate regulation |
| OC (Pin 3) | Overshoot control node | 8.5µA current source charges external capacitor; clamped at 0.93V; pulled low during UVLO (<2.2V) and short-circuit recovery |
| FB (Pin 4) | Error amplifier inverting input | Regulates to 600mV; −75nA input bias current flows out; connects to mid-point of external resistor divider |
| COMP (Pin 5) | Error amplifier output | Voltage-mode output; drives opto-driver input; used for frequency compensation (RC network to FB) |
| OPTO (Pin 6) | Opto-coupler driver output | Inverting −6× gain stage; sources up to 10.5mA; short-circuit protected; referenced to GND for low-VOUT compatibility |
Key Features
| Feature | Design Value |
|---|---|
| Ground-referenced opto-coupler drive | Eliminates secondary-side shunt regulator (e.g., TL431), simplifying layout and improving transient response in low-output-voltage converters |
| Programmable overshoot control | Single external capacitor on OC pin sets ramp rate; prevents >5% output overshoot during startup and short-circuit recovery |
| High-bandwidth error amplifier | 9MHz unity-gain bandwidth enables stable compensation with minimal external components-no complex type-II/type-III networks required |
| Trimmed 600mV reference | ±0.75% initial accuracy and ±1.25% tolerance over −40°C to +125°C ensures <±1% output voltage drift across operating range |
| Short-circuit protected output | OPTO pin sustains indefinite short-circuit while limiting current to ≤45mA (MP-grade) or ≤22mA (E/I-grade), protecting opto-LED and primary controller |
Applications
| 48V Input Isolated DC/DC Converters | Isolated Telecommunication Power Systems |
|---|---|
|
Use Scenario: 48V telecom rectifier feeding isolated 3.3V/5V/12V outputs in distributed power architecture. IC Role / Device Role / Timing Role: Secondary-side feedback controller that replaces TL431 + opto-coupler combo; regulates output by driving opto-LED referenced to GND. Use Value: Enables tighter output regulation (±0.5%) and faster transient recovery vs. TL431-based solutions due to higher error amp bandwidth and integrated overshoot control. |
Use Scenario: Hot-swap power modules in central office equipment requiring reliable start-up and fault recovery under varying line conditions. IC Role / Device Role / Timing Role: Isolation barrier feedback element that monitors VOUT and signals primary controller via opto-coupler; OC pin manages soft-start and short-circuit ramp. Use Value: Prevents output overshoot exceeding 3% during cold-start and recovers regulation within 2ms after short-circuit removal-critical for powering sensitive ASICs. |
| Distributed Power Step-Down Converters | Industrial Control Systems |
|
Use Scenario: Point-of-load (POL) converters deriving 1.2V–5V rails from 12V/24V intermediate bus in server or networking gear. IC Role / Device Role / Timing Role: Precision secondary-side regulator IC providing feedback signal across isolation barrier; COMP-to-FB compensation sets loop dynamics. Use Value: Supports fast load-step response (<10µs to settle) and maintains <±0.8% output accuracy over temperature, meeting tight POL voltage tolerances. |
Use Scenario: Programmable logic controller (PLC) power supplies operating in harsh factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Isolated feedback interface ensuring safe galvanic separation between field I/O and control logic; GND-referenced OPTO simplifies PCB routing near noisy digital sections. Use Value: Qualified for −40°C to +125°C operation with guaranteed specs; eliminates thermal drift-induced regulation errors common in discrete op-amp + reference solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary-side opto-coupler driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments UCC27531DR | Single-channel gate driver (not integrated reference/error amp); no built-in 600mV reference or overshoot control; requires external feedback path | Used in primary-side gate driving or discrete feedback loops-not drop-in replacement for LT4430IS6#TRMPBF's full secondary-side regulation function | Select only if designing custom error amp + reference + driver; not suitable for direct substitution in TL431-replacement applications |
| ON Semiconductor NCP101x series (e.g., NCP1014) | Integrated PWM controller with primary-side sensing; lacks secondary-side feedback capability, opto-driver, or programmable overshoot control | Targets self-oscillating flyback controllers where regulation occurs on primary side-no galvanic isolation feedback role | Not functionally comparable; applicable only in non-isolated or primary-sensing topologies, not secondary-side regulated supplies |
Compared with UCC27531DR and NCP1014, the LT4430IS6#TRMPBF uniquely integrates reference, error amplifier, opto-driver, and overshoot control in one TSOT-23 package-enabling true secondary-side regulation without external op-amps or discrete timing components.
Availability
LT4430IS6#TRMPBF is available at Aetrix Electronics and suitable for 48V telecom power systems, isolated industrial DC/DC converters, and distributed power step-down applications requiring stable component supply, long-term lifecycle support, and guaranteed performance across −40°C to +125°C.
Supply support for LT4430IS6#TRMPBF 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 LT4430 family.
The LT4430 product line was designed specifically for high-accuracy, low-overshoot secondary-side regulation in isolated switch-mode power supplies-replacing TL431-based feedback with integrated error amplification and active startup control.
FAQ
What is the function of the OC pin on the LT4430IS6#TRMPBF?
The OC (Overshoot Control) pin on the LT4430IS6#TRMPBF hosts an 8.5µA current source that charges an external capacitor to control output voltage ramp rate during startup and short-circuit recovery. When a fault occurs, the OC amplifier pulls the pin to FB + 48mV, preventing overshoot. The OC pin is actively held low if VIN falls below 2.2V (UVLO threshold), ensuring controlled release at power-up. This behavior is fully specified in the LT4430IS6#TRMPBF datasheet's Electrical Characteristics table.
Does the LT4430IS6#TRMPBF require an external reference or error amplifier?
No-the LT4430IS6#TRMPBF integrates a precision-trimmed 600mV bandgap reference and a high-bandwidth 9MHz error amplifier. The reference is internally connected to the noninverting input of the error amplifier, and FB serves as the inverting input. No external reference or op-amp is needed; only a resistor divider (R1/R2) connected to FB and GND is required to set output voltage. This integration is confirmed in the LT4430IS6#TRMPBF block diagram and Applications Information section.
Can the LT4430IS6#TRMPBF drive standard PC817 or SFH615A opto-couplers?
Yes-the LT4430IS6#TRMPBF's OPTO pin sources up to 10.5mA (E/I-grade) with short-circuit protection, matching the 5–10mA CTR-driven LED requirements of PC817, SFH615A, and similar general-purpose opto-couplers. Its ground-referenced output simplifies biasing, and the inverting −6× gain ensures sufficient drive margin even with aging or low-CTR devices. Drive capability is verified in the LT4430IS6#TRMPBF Electrical Characteristics table under "Opto Driver Output Short-Circuit Current (Sourcing)."
What is the maximum allowable input voltage for the LT4430IS6#TRMPBF?
The absolute maximum input voltage (VIN) for the LT4430IS6#TRMPBF is 20V, as stated in the Absolute Maximum Ratings table. Operating continuously above this level risks permanent damage. The recommended operating range is 3V to 20V; operation below 3V triggers undervoltage lockout (UVLO), holding the OC pin low and disabling regulation. This limit is consistent across all grade variants (E/I/H/MP) and is measured at the VIN pin with respect to GND.
How does the LT4430IS6#TRMPBF differ from a TL431-based feedback solution?
The LT4430IS6#TRMPBF replaces the TL431 + opto-coupler combination with a single IC that integrates a precision reference, error amplifier, and ground-referenced opto-driver. Unlike TL431-which requires cathode-side opto-drive and suffers from limited bandwidth (~10kHz)-the LT4430IS6#TRMPBF offers 9MHz error amp bandwidth, programmable overshoot control, and eliminates secondary-side shunt dissipation. These advantages are documented in the LT4430IS6#TRMPBF Typical Application schematics and Applications Information section.
LT4430IS6#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Optocoupler Driver
- Current - Supply:
- 1.9mA
- Voltage - Supply:
- 3V ~ 20V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT4430IS6#TRMPBF FAQ
1.How can I place an order for LT4430IS6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4430IS6#TRMPBF 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 LT4430IS6#TRMPBF reliable?
The price and inventory of LT4430IS6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4430IS6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT4430IS6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4430IS6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4430IS6#TRMPBF?
LT4430IS6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4430IS6#TRMPBF 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 LT4430IS6#TRMPBF?
For technical support, including LT4430IS6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4430IS6#TRMPBF requirements.
6.How does Aetrix verify that LT4430IS6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT4430IS6#TRMPBF 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 LT4430IS6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT4430IS6#TRMPBF?
All LT4430IS6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4430IS6#TRMPBF, 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 LT4430IS6#TRMPBF part is unused and in its original packaging.
Return procedure for LT4430IS6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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