My Inquiry
My Account
Analog Devices Inc. LT4430ES6#TRPBF
- Part No.:
- LT4430ES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT4430ES6#TRPBF.pdf
- Description:
- IC OPTOCOUPLER GATE DRVR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,845
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT4430ES6#TRPBF 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 stage, and unique capacitor-based overshoot control circuitry. It delivers 10mA opto-coupler drive current with short-circuit protection and operates from 3V to 20V input, enabling precise regulation in telecom and industrial offline converters.
For engineers reviewing the LT4430ES6#TRPBF datasheet, LT4430ES6#TRPBF pinout, LT4430ES6#TRPBF application, or LT4430ES6#TRPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, TSOT-23 package details, functional alternatives, and supply-chain support - all grounded in the official Linear Technology/LTC documentation.
Technical Context
The LT4430ES6#TRPBF implements a voltage-mode feedback architecture where the FB pin regulates to an internal 600mV reference, while the COMP pin serves as the error amplifier output for external frequency compensation. Its 9MHz unity-gain bandwidth enables stable loop design with minimal phase shift at typical crossover frequencies (10–100kHz).
Overshoot control is implemented via the OC pin: an internal 8.5µA current source charges an external capacitor to linearly ramp the effective reference during startup and short-circuit recovery; the OC amplifier actively pulls the capacitor down to FB + 48mV during faults. The OPTO pin drives the opto-coupler with inverting −6× gain referenced to GND, eliminating the need for TL431-based secondary-side shunt regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 600mV ±0.75% initial accuracy; ensures tight output voltage setpoint tolerance without external trimming. |
| Error Amplifier GBW | 9MHz unity-gain bandwidth; allows simple RC compensation and preserves phase margin up to ~100kHz loop crossover. |
| Opto Driver Output | 10mA sourcing capability with short-circuit protection; directly drives common PC817/PS2561-type opto-couplers without external transistors. |
| Input Voltage Range | 3V to 20V; supports biasing from auxiliary windings in flyback, forward, and push-pull topologies across wide VIN ranges. |
| Overshoot Control | Capacitor-programmable ramp using 8.5µA OC current source; prevents >5% output overshoot during startup and fault recovery. |
| Operating Temp Range | −40°C to +125°C junction; qualified for industrial and telecom power systems with extended thermal reliability. |
| Package | 6-lead TSOT-23 (1mm height); surface-mount compatible with high-density PCB layouts and automated assembly. |
Pinout & Package
The LT4430ES6#TRPBF is housed in a 6-lead plastic TSOT-23 package (0.95mm × 2.9mm × 1.1mm), lead-free, tape-and-reel packaged. Pin 1 is marked with a dot; pin numbering follows standard TSOT-23 top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power supply input | Accepts 3V–20V; powers all internal circuitry; requires local 1µF bypass to GND for stability. |
| GND (Pin 2) | Analog ground reference | Serves as return path for reference and FB divider; must connect external R-divider bottom directly to minimize noise coupling. |
| OC (Pin 3) | Overshoot control node | Internal 8.5µA current source charges external capacitor; clamped at 0.93V; pulled low during UVLO (<2.2V). |
| FB (Pin 4) | Inverting error amplifier input | Regulates to 600mV; −75nA input bias current flows out; connects to resistor divider tap for VOUT programming. |
| COMP (Pin 5) | Error amplifier output | Voltage-mode output used for loop compensation; drives OPTO stage; logic detects clamp level (>1.2V) to trigger OC recovery. |
| OPTO (Pin 6) | Opto-coupler driver output | Inverting −6× gain stage referenced to GND; sources up to 10mA; sinks 350µA; short-circuit protected. |
Key Features
| Feature | Design Value |
|---|---|
| Ground-referenced opto drive | Eliminates TL431 dependency and simplifies compensation by removing secondary-side shunt regulator pole. |
| Capacitor-programmed overshoot control | Single external capacitor sets soft-start and fault-recovery ramp rate; no additional ICs or complex timing circuits required. |
| High-bandwidth error amplifier | 9MHz GBW enables robust phase margin with minimal compensation components - typically one series RC from COMP to FB. |
| 600mV precision reference | ±1.25% tolerance over −40°C to +125°C; reduces output voltage drift in harsh thermal environments without calibration. |
| Integrated UVLO with OC hold-down | Holds OC pin low until VIN exceeds 2.2V; ensures controlled startup sequence and prevents premature regulation. |
Applications
| 48V Input Isolated DC/DC Converters | Isolated Telecommunication Power Systems |
|---|---|
Use Scenario: 48V telecom rectifier feeding isolated 12V/5V/3.3V outputs in central office or remote radio units. IC Role / Device Role / Timing Role: Secondary-side feedback controller that closes the regulation loop across the isolation barrier via opto-coupler. Use Value: Enables <1% output voltage deviation under line/load transients while meeting ETSI/GR-1089 immunity requirements via clean, low-noise feedback path. |
Use Scenario: Distributed power architecture in 1RU server PSUs with multiple isolated rails and strict ripple/noise limits. IC Role / Device Role / Timing Role: Precision secondary-side error amplifier and opto-driver ensuring fast transient response and accurate cross-regulation. Use Value: Delivers 9MHz error amp bandwidth to maintain >60° phase margin at 50kHz crossover, reducing output filter size by 30% vs legacy TL431 solutions. |
| Distributed Power Step-Down Converters | Industrial Control Systems |
Use Scenario: Point-of-load (POL) converters in programmable logic controllers (PLCs) requiring isolated 24V-to-5V/3.3V conversion. IC Role / Device Role / Timing Role: Isolated feedback interface between primary PWM controller and secondary-side sensing network. Use Value: 10mA opto drive sustains CTR degradation over 10+ years; OC function prevents >3% overshoot during cold-start at −40°C ambient. |
Use Scenario: DIN-rail mounted AC/DC power supplies powering I/O modules, HMI panels, and safety relays in factory automation. IC Role / Device Role / Timing Role: Secondary-side regulation supervisor with built-in fault recovery and thermal-stable reference. Use Value: ±1.25% reference tolerance over full temperature range ensures consistent 24V output accuracy across −25°C to +70°C cabinet environments. |
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 UCC27531DBV | Single-channel gate driver (non-isolated), 4A peak, no integrated reference or error amp; requires external feedback circuitry. | Designed for driving MOSFET gates on primary side; not a drop-in replacement - lacks secondary-side regulation functions. | Select only if redesigning feedback topology to use primary-side sensing; not suitable for replacing LT4430ES6#TRPBF in existing isolated designs. |
| Analog Devices ADUM3190TRZ | Digital isolator with integrated error amplifier and 2.5V reference; galvanically isolated analog feedback channel (no opto-coupler needed). | Replaces opto-coupler entirely; eliminates CTR aging and temperature drift; requires different PCB layout and loop compensation. | Choose for new designs prioritizing long-term stability and reduced BOM count; not pin-compatible and requires revalidation of loop dynamics. |
Compared with UCC27531DBV and ADUM3190TRZ, the LT4430ES6#TRPBF uniquely combines precision reference, error amplifier, opto-driver, and overshoot control in one TSOT-23 package - enabling compact, cost-effective, and field-proven isolated feedback without redesigning the control architecture.
Availability
LT4430ES6#TRPBF is available at Aetrix Electronics and suitable for 48V input isolated DC/DC converters, isolated telecommunication power systems, and industrial control systems requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for LT4430ES6#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, Inc. (ADI) acquired Linear Technology in 2017 and maintains full product support, datasheets, and application engineering for the LT® family of power management ICs.
The LT4430 belongs to Linear's isolated power feedback product line, designed specifically to replace TL431-based opto-coupler interfaces with higher accuracy, faster transient response, and integrated fault recovery - targeting telecom, industrial, and automotive off-line power supplies.
FAQ
What is the primary function of the LT4430ES6#TRPBF in an isolated power supply?
The LT4430ES6#TRPBF serves as a secondary-side feedback controller that replaces traditional TL431 + opto-coupler combinations. It integrates a precision 600mV reference, high-bandwidth error amplifier, inverting opto-driver, and overshoot control circuitry - all in a single TSOT-23 package. In the LT4430ES6#TRPBF, the FB pin regulates to 600mV, COMP drives the opto-coupler via OPTO, and OC manages startup/fault recovery using an external capacitor.
How does the overshoot control feature work in the LT4430ES6#TRPBF?
The LT4430ES6#TRPBF uses its OC pin to implement capacitor-programmed overshoot control: an internal 8.5µA current source charges an external capacitor from GND, creating a linear ramp voltage that acts as the temporary error amplifier reference. During startup or short-circuit recovery, this ramp prevents output voltage overshoot. If a fault occurs, the OC amplifier pulls the capacitor down to FB + 48mV; when the fault clears, the capacitor resumes charging. This behavior is fully documented in the LT4430ES6#TRPBF datasheet Figures 1a–1e and Applications Information section.
What is the maximum opto-coupler drive current supported by the LT4430ES6#TRPBF?
The LT4430ES6#TRPBF guarantees a minimum opto-coupler drive current of 10.5mA (E/I-grade, typical 22mA) with short-circuit protection. It sources up to 10mA into the opto-coupler LED while maintaining specified output swing and gain. The OPTO pin's inverting −6× gain stage is optimized for driving common PC817, PS2561, and TLP185 opto-couplers. This drive capability is validated across the full −40°C to +125°C operating range and is explicitly stated in the LT4430ES6#TRPBF Electrical Characteristics table under "Opto Driver Output Short-Circuit Current (Sourcing)".
Can the LT4430ES6#TRPBF be biased directly from the output voltage (VOUT)?
The LT4430ES6#TRPBF can be biased from VOUT only if VOUT ≥ 3.3V and the overshoot control (OC) function is disabled; however, this configuration requires careful validation of large-signal startup and fault recovery behavior. When OC is active or VOUT < 3V, an auxiliary winding or preregulator bias supply is mandatory - as detailed in the LT4430ES6#TRPBF Applications Information (pages 10–16). The IC's undervoltage lockout (UVLO) threshold is 2.2V, and proper sequencing (VIN rising before VOUT) is essential to assert loop control and prevent overshoot.
What package type and temperature grade does the LT4430ES6#TRPBF have?
The LT4430ES6#TRPBF uses a 6-lead plastic TSOT-23 package (1mm height) and is rated for operation from −40°C to +125°C junction temperature (E-grade). It is supplied in lead-free, RoHS-compliant tape-and-reel format with part marking "LTBFY". This temperature grade is confirmed in the "Order Information" table on page 2 of the official LT4430 datasheet and applies to both LT4430ES6#PBF and LT4430ES6#TRPBF variants.
LT4430ES6#TRPBF 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
LT4430ES6#TRPBF FAQ
1.How can I place an order for LT4430ES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4430ES6#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 LT4430ES6#TRPBF reliable?
The price and inventory of LT4430ES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4430ES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LT4430ES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4430ES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4430ES6#TRPBF?
LT4430ES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4430ES6#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 LT4430ES6#TRPBF?
For technical support, including LT4430ES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4430ES6#TRPBF requirements.
6.How does Aetrix verify that LT4430ES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT4430ES6#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 LT4430ES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LT4430ES6#TRPBF?
All LT4430ES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4430ES6#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 LT4430ES6#TRPBF part is unused and in its original packaging.
Return procedure for LT4430ES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT4430ES6#TRPBF Tags
-
TPS2511DGNR
Texas Instruments
-
UTC2000/MG
Microchip Technology
-
TUSB320HAIRWBR
Texas Instruments
-
TPS61252DSGR
Texas Instruments
-
PI5USB30216CXUAEX
Diodes Incorporated
-
SN6501DBVR
Texas Instruments
-
CYPD3177-24LQXQT
Infineon Technologies
-
SN6501QDBVRQ1
Texas Instruments
-
STUSB1600AQTR
STMicroelectronics
-
SN6505BDBVR
Texas Instruments
-
SN6501DBVT
Texas Instruments
-
TPS65150PWPR
Texas Instruments
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…
