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Analog Devices Inc. LT4430ES6#TRMPBF
- Part No.:
- LT4430ES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT4430ES6#TRMPBF.pdf
- Description:
- IC OPTOCOUPLER GATE DRVR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,688
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Product details
Overview
LT4430ES6#TRMPBF from Analog Devices (formerly Linear Technology) is a secondary-side opto-coupler driver IC for isolated DC/DC power supplies, integrating a 0.6V precision reference (±0.75% initial accuracy), 9MHz error amplifier, inverting −6× opto-driver stage, and overshoot control circuitry. It delivers 10mA opto-coupler drive current with short-circuit protection and operates across 3V–20V input supply range, enabling stable regulation in telecom and industrial offline converters.
For engineers reviewing the LT4430ES6#TRMPBF datasheet, LT4430ES6#TRMPBF pinout, LT4430ES6#TRMPBF application, or LT4430ES6#TRMPBF equivalent, this page provides verified technical context, package mapping to TSOT-23-6, confirmed pin functions (VIN, GND, OC, FB, COMP, OPTO), real-world start-up overshoot mitigation behavior, and validated alternative options for isolated feedback loop design.
Technical Context
The LT4430ES6#TRMPBF implements a voltage-mode error amplifier with 80dB open-loop DC gain and 9MHz unity-gain bandwidth, enabling simple frequency compensation with minimal phase shift at typical loop crossover frequencies (10–100kHz). Its internal 0.6V reference is trimmed and temperature-compensated, delivering ±1.25% tolerance over −40°C to 125°C junction temperature.
Overshoot control is implemented via an on-chip 8.5µA current source charging an external capacitor from the OC pin, with active clamping at 0.93V and built-in 48mV offset for fault recovery. The opto-coupler driver uses an inverting gain of −6 configuration referenced to GND, sourcing up to 10mA while sinking 350µA, eliminating need for TL431-based secondary-side references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 0.6V ±0.75% initial accuracy; enables precise output voltage setting via resistor divider (VOUT = 0.6V × (1 + R1/R2)) |
| Error Amplifier Bandwidth | 9MHz unity-gain bandwidth; ensures negligible phase lag at typical feedback loop crossover frequencies (≤100kHz) |
| Opto Driver Output Current | 10mA sourcing capability; sufficient to bias standard PC817/PS2561 opto-couplers without external boost |
| Input Supply Range | 3V to 20V; supports direct biasing from auxiliary windings in flyback, forward, and push-pull topologies |
| Overshoot Control | Single-capacitor ramp control (OC pin); prevents output overshoot during start-up and short-circuit recovery |
| Operating Temperature | −40°C to +125°C junction; qualified for industrial and telecom power systems with extended thermal margin |
| Package | 6-lead TSOT-23 (1mm height); surface-mount compatible with high-density isolated power PCB layouts |
Pinout & Package
LT4430ES6#TRMPBF is housed in a 6-lead plastic TSOT-23 package (1mm profile), optimized for space-constrained isolated power supply designs. 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 |
| GND (Pin 2) | Analog ground reference | Return path for internal 0.6V reference and external feedback divider; must connect directly to system ground plane |
| OC (Pin 3) | Overshoot control node | 8.5µA current source charges external capacitor; clamped at 0.93V; controls ramp rate during start-up/fault recovery |
| FB (Pin 4) | Inverting error amplifier input | Regulates to 0.6V; −75nA input bias current; connects to bottom of feedback resistor divider |
| COMP (Pin 5) | Error amplifier output | Voltage-mode output; used for frequency compensation (R-C network to FB); triggers OC logic when clamped high |
| OPTO (Pin 6) | Opto-coupler driver output | Inverting −6× gain stage; GND-referenced; sources 10mA; eliminates need for TL431 secondary-side reference |
Key Features
| Feature | Design Value |
|---|---|
| 0.6V Precision Reference | ±0.75% initial accuracy and ±1.25% over −40°C to 125°C; enables <1% output voltage tolerance in final system |
| 9MHz Error Amplifier | High bandwidth permits single-pole compensation with minimal external components; reduces phase margin risk in fast-transient applications |
| GND-Referenced Opto Drive | Eliminates secondary-side shunt regulator (e.g., TL431); simplifies layout, lowers BOM count, and improves low-output-voltage regulation |
| Overshoot Control Circuitry | Single external capacitor sets controlled voltage ramp; prevents >5% output overshoot during cold start and post-fault recovery |
| Short-Circuit Protected Driver | 10mA sourcing with indefinite short-circuit tolerance on OPTO pin; maintains loop integrity during sustained overload conditions |
Applications
| 48V Input Isolated DC/DC Converters | Isolated Telecommunication Power Systems |
|---|---|
Use Scenario: 48V telecom rectifier feeding isolated 12V/5V/3.3V point-of-load converters in central office equipment. IC Role / Device Role / Timing Role: Secondary-side feedback controller driving opto-coupler across isolation barrier to regulate primary-side PWM controller. Use Value: Enables tight output regulation (<±1%) under dynamic load steps while suppressing start-up overshoot via OC pin capacitor. |
Use Scenario: Redundant -48V backup power systems in LTE base stations requiring high reliability and transient immunity. IC Role / Device Role / Timing Role: Isolated voltage monitor and error signal generator for primary-side digital controller (e.g., LTC3891). Use Value: 9MHz error amplifier bandwidth ensures loop stability with wide input variation (36–72V); 125°C rating supports sealed chassis operation. |
| Distributed Power Step-Down Converters | Industrial Control Systems |
Use Scenario: Factory automation PLCs using distributed 24V bus powering multiple isolated 5V/3.3V modules. IC Role / Device Role / Timing Role: Secondary-side regulation element in multi-output flyback supplying isolated I/O and communication interfaces. Use Value: GND-referenced OPTO output allows direct opto-coupler connection without level-shifting; reduces component count vs. TL431+transistor solutions. |
Use Scenario: Motor drive inverters with isolated gate drivers and analog sensor interfaces requiring reinforced isolation. IC Role / Device Role / Timing Role: Feedback interface between isolated secondary rail and primary-side microcontroller-based PWM generator. Use Value: Undervoltage lockout (2.2V threshold) ensures clean start-up sequence; OC function prevents overvoltage damage to downstream I/O circuits during fault recovery. |
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 0.6V reference or overshoot control | Requires external error amplifier and reference; suited for discrete feedback loops where full integration is unnecessary | Select if designing custom compensation or needing higher drive current (4A peak); not drop-in for LT4430ES6#TRMPBF |
| ON Semiconductor NCP101x series (e.g., NCP1014) | Primary-side PWM controller with integrated HV startup; no secondary-side feedback capability | Used in primary-controlled flybacks without opto-coupler; lacks secondary regulation precision and OC function | Choose only for cost-sensitive, non-isolated or primary-regulated topologies; incompatible with isolated feedback architecture |
Compared with UCC27531DR and NCP1014, the LT4430ES6#TRMPBF uniquely integrates reference, error amplifier, opto-driver, and overshoot control in one TSOT-23-6 package-reducing footprint by >40% and eliminating 5–7 external components required by discrete alternatives.
Availability
LT4430ES6#TRMPBF 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-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT4430ES6#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, documentation, and manufacturing continuity for the LT® family of high-performance analog ICs.
The LT4430ES6#TRMPBF belongs to Linear Technology's isolated power management product line, designed specifically to replace TL431-based secondary-side feedback networks with integrated, high-bandwidth, low-component-count solutions for telecom and industrial DC/DC converters.
FAQ
What is the primary function of the LT4430ES6#TRMPBF in an isolated power supply?
The LT4430ES6#TRMPBF serves as a secondary-side opto-coupler driver that closes the feedback loop across the galvanic isolation barrier. It integrates a precision 0.6V reference, high-bandwidth error amplifier, inverting −6× opto-driver, and overshoot control circuitry-enabling accurate output regulation while preventing voltage overshoot during start-up and fault recovery. This eliminates the need for discrete TL431 and transistor implementations in the LT4430ES6#TRMPBF-based design.
How does the overshoot control feature of the LT4430ES6#TRMPBF work?
The LT4430ES6#TRMPBF implements overshoot control via its OC (overshoot control) pin, which sources a precise 8.5µA current to charge an external capacitor to ground. During start-up, the OC voltage ramps linearly, acting as the error amplifier's reference until it exceeds 0.6V-thereby controlling output voltage rise time. In short-circuit recovery, the OC pin is actively pulled down to FB + 48mV, ensuring controlled re-engagement of regulation. This behavior is fully documented in the LT4430ES6#TRMPBF datasheet Figures 1a–1e and Applications Information section.
What is the recommended external capacitor value for the OC pin in the LT4430ES6#TRMPBF?
The LT4430ES6#TRMPBF datasheet specifies the OC pin ramp rate as (COC × 0.6V)/8.5µA. For typical 10ms start-up time targeting ≤3% overshoot, a 142nF capacitor is recommended (COC = (8.5µA × 10ms)/0.6V ≈ 142nF). Standard values like 150nF or 120nF are commonly used; X7R ceramic capacitors rated ≥16V are preferred for stability and low ESR. This value is validated in LT4430ES6#TRMPBF Typical Application schematics and Figure 1b timing plots.
Can the LT4430ES6#TRMPBF be biased directly from the output voltage (VOUT)?
The LT4430ES6#TRMPBF may be biased from VOUT only if VOUT ≥ 3.3V and the overshoot control function is disabled; however, this configuration risks uncontrolled start-up behavior due to delayed VIN ramp relative to VOUT. When using OC functionality-or when VOUT < 3V-the LT4430ES6#TRMPBF requires a dedicated bias supply (e.g., auxiliary winding + rectifier + RC filter), as detailed in Figures 1d–1e and 2a–2b of the LT4430ES6#TRMPBF datasheet.
What is the maximum opto-coupler drive current provided by the LT4430ES6#TRMPBF?
The LT4430ES6#TRMPBF guarantees a minimum opto-coupler drive current of 10mA sourced from the OPTO pin under specified conditions (VIN = 3V–20V, FB = 1V, COMP = open). This is sufficient to bias common opto-couplers such as PC817, PS2561, and TLP185 without external amplification. Short-circuit protection ensures indefinite survival at 0V OPTO output, and the driver also sinks 350µA typically-supporting bidirectional signaling in advanced topologies. These values are measured and specified in the LT4430ES6#TRMPBF Electrical Characteristics table.
LT4430ES6#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
LT4430ES6#TRMPBF FAQ
1.How can I place an order for LT4430ES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4430ES6#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 LT4430ES6#TRMPBF reliable?
The price and inventory of LT4430ES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4430ES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT4430ES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4430ES6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4430ES6#TRMPBF?
LT4430ES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4430ES6#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 LT4430ES6#TRMPBF?
For technical support, including LT4430ES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4430ES6#TRMPBF requirements.
6.How does Aetrix verify that LT4430ES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT4430ES6#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 LT4430ES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT4430ES6#TRMPBF?
All LT4430ES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4430ES6#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 LT4430ES6#TRMPBF part is unused and in its original packaging.
Return procedure for LT4430ES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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