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Analog Devices Inc. LT8304ES8E-1#PBF
- Part No.:
- LT8304ES8E-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8304ES8E-1#PBF.pdf
- Description:
- IC REG FLYBACK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,589
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Product details
Overview
LT8304ES8E-1#PBF from Analog Devices (formerly Linear Technology) is a monolithic micropower isolated flyback controller IC with integrated 150V/2A DMOS switch, operating from 3V to 100V input and delivering up to 24W isolated output power. It enables opto-isolator–free regulation via primary-side flyback waveform sampling, supports boundary mode and low-ripple Burst Mode® operation, and targets high step-up ratio applications such as 4V–80VIN/5VOUT auxiliary supplies in industrial and automotive systems.
For engineers reviewing the LT8304ES8E-1#PBF datasheet, LT8304ES8E-1#PBF pinout, LT8304ES8E-1#PBF application, or LT8304ES8E-1#PBF equivalent, key selection considerations include its 116µA sleep-mode quiescent current, 150V SW pin rating, 390µA active-mode IQ, 1.00V internal RREF reference, and optimized immunity to primary-side current ringing in ≥5:1 step-up configurations.
Technical Context
The LT8304ES8E-1#PBF implements quasi-resonant boundary conduction mode at heavy load-turning on the internal switch at the valley of SW node ringing when secondary current reaches zero-to achieve excellent load regulation without third-winding compensation. Its sample-and-hold error amplifier directly measures isolated output voltage from the flyback pulse amplitude, eliminating opto-isolators and reducing component count.
At light loads, it transitions to low-ripple Burst Mode® operation with a minimum 11kHz switching frequency, maintaining high efficiency while limiting output voltage ripple. The LT8304-1 variant (denoted by "-1" suffix) features extended blanking time immunity and is specifically validated for high step-up applications (≥5:1 transformer turns ratio), distinguishing it from the base LT8304 in transient response robustness under high-VIN/light-load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 100V - supports wide-input industrial and automotive battery-supplied systems without external pre-regulation. |
| Integrated Switch | 150V/2A DMOS - eliminates external high-voltage MOSFET; rated for 150V transients on SW pin with derating guidance for leakage spikes. |
| Quiescent Current | 116µA (Sleep), 390µA (Active) - enables micropower operation in always-on auxiliary supplies with minimal standby loss. |
| RREF Reference Voltage | 1.00V ±2% - precision internal reference used with external RFB/RREF divider to set output voltage independent of transformer turns ratio. |
| Switching Frequency Range | 8–385kHz - variable-frequency boundary mode (heavy load) clamped to ≤350kHz max, plus low-ripple Burst Mode® (light load) down to 11kHz min. |
| Minimum tON | 950ns - longer than LT8304's 160ns, providing enhanced noise immunity against false triggering from SW node ringing in high step-up designs. |
| TC Pin Output | 1.00V at 25°C, +3.35mV/°C PTAT - enables direct temperature compensation of output diode forward voltage drift in low-VOUT designs. |
Pinout & Package
LT8304ES8E-1#PBF is housed in an 8-lead plastic SO package (S8E) with exposed thermal pad (Pin 9, GND). The thermally enhanced package enables high-power-density isolated flyback designs with junction-to-ambient θJA = 33°C/W when the exposed pad is soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Input Undervoltage Lockout Input | Accurate 1.214V enable threshold with 14mV hysteresis; enables programmable VIN UVLO using resistor divider; tie to VIN if unused. |
| INTVCC (Pin 2) | Internal 3V LDO Output | Powers internal control circuitry; must be bypassed with ≥1µF ceramic capacitor to GND; no external supply allowed. |
| VIN (Pin 3) | Main Input Supply | Supplies internal circuitry and serves as reference for RFB feedback path; requires local bulk and ceramic bypassing. |
| GND (Pin 4 + Exposed Pad Pin 9) | Power and Signal Ground | Exposes thermal pad for PCB heat sinking; both pins must connect to solid ground plane for thermal and EMI performance. |
| SW (Pin 5) | Drain of Internal 150V/2A DMOS Switch | High-slew, high-voltage node; minimize trace area and loop inductance to suppress EMI and voltage overshoot. |
| RFB (Pin 6) | Feedback Resistor Input | Connects to transformer primary SW node; converts flyback pulse amplitude into current proportional to VOUT; sensitive to layout parasitics. |
| RREF (Pin 7) | Reference Resistor Input | Ground-referred node for RREF resistor (typically 10kΩ); voltage regulated to 1.00V; sets output voltage with RFB and transformer ratio. |
| TC (Pin 8) | Temperature Compensation Output | PTAT voltage (1.00V @ 25°C, +3.35mV/°C); used with RTC resistor to offset output diode VF drift in 3.3V/5V designs. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Eliminates opto-isolator and third transformer winding-reducing BOM cost, size, and long-term drift issues in medical/industrial isolation barriers. |
| Boundary mode + Burst Mode® | Enables high efficiency across full load range: >85% at full load (boundary), >75% at 1% load (Burst Mode®), with <15mVPP output ripple. |
| High step-up optimization (-1 variant) | Extended 950ns minimum on-time and improved current comparator blanking make LT8304ES8E-1#PBF suitable for ≥5:1 transformer ratios without false triggering. |
| Internal compensation & soft-start | Reduces external components: no external loop compensation required; built-in 11ms soft-start prevents inrush current and output overshoot. |
| Output short-circuit protection | Auto-recovery hiccup mode limits power dissipation during sustained short circuits-enabling robust operation in unattended systems. |
Applications
| Industrial Auxiliary Power | Automotive Body Control Module |
|---|---|
Use Scenario: Isolated 5V housekeeping supply for PLC I/O modules powered from 24VDC or 48VDC field bus. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated 5V output without opto-isolator or third winding. Use Value: Reduces bill-of-materials by 3–4 components versus traditional opto-based solutions while maintaining ±3% output regulation over –40°C to 125°C. | Use Scenario: 3.3V isolated bias rail for CAN transceiver and microcontroller in body control unit with 9–16V battery input. IC Role / Device Role / Timing Role: Micropower flyback controller enabling <120µA system standby current with fast wake-up from sleep mode. Use Value: Achieves <0.5% minimum load requirement and 116µA sleep IQ-meeting OEM requirements for ultra-low-power vehicle-off states. |
| Medical Patient Monitoring | Telecom Remote PHY Unit |
Use Scenario: 12V isolated output for analog front-end sensors in portable ECG device with 3.6V Li-ion input. IC Role / Device Role / Timing Role: High-efficiency boundary-mode controller delivering 24W peak power with low EMI due to valley-switching. Use Value: Meets IEC 60601 creepage/clearance requirements via reinforced isolation while minimizing heat generation in compact enclosures. | Use Scenario: 5V/2A isolated supply for remote PHY digital signal processor in fiber-to-the-home node with 48V PoE input. IC Role / Device Role / Timing Role: Optimized LT8304-1 variant handling 8:1 step-up ratio (48VIN → 5VOUT) with stable regulation despite high reflected capacitance. Use Value: Enables reliable operation at 72VIN transients without output dropout-critical for outdoor telecom equipment with lightning surge exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8304ES8E#PBF | Base variant with 160ns minimum tON; less immune to SW node ringing in high step-up designs. | Suitable for ≤4:1 transformer ratios and moderate-VIN applications (e.g., 12V–48VIN/5VOUT). | Select LT8304ES8E#PBF only when transformer turns ratio is <5:1 and layout minimizes SW node ringing. |
| UCC28911DR | TI controller with 700V integrated MOSFET; no TC pin; fixed 100kHz frequency; higher IQ (250µA active). | Better suited for universal AC input (85–265VAC) offline flyback; lacks temperature compensation for low-VOUT accuracy. | Choose UCC28911DR for AC/DC adapter designs requiring higher input voltage range and simpler compensation, but not for precision low-VOUT DC/DC. |
Compared with LT8304ES8E#PBF, the LT8304ES8E-1#PBF provides superior noise immunity in high step-up applications, while UCC28911DR offers higher input voltage capability but sacrifices output voltage temperature stability and micropower performance.
Availability
LT8304ES8E-1#PBF is available at Aetrix Electronics and suitable for industrial auxiliary power, automotive body control modules, medical patient monitoring, and telecom remote PHY units requiring stable component supply with guaranteed long-term availability.
Supply support for LT8304ES8E-1#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8304 product line delivers monolithic isolated flyback controllers with integrated high-voltage switches, targeting space-constrained, low-component-count isolated DC/DC solutions where opto-isolator reliability and aging are critical concerns.
FAQ
What is the key functional difference between LT8304ES8E-1#PBF and LT8304ES8E#PBF?
The LT8304ES8E-1#PBF features a longer minimum switch-on time (950ns vs. 160ns) and enhanced immunity to primary-side current ringing, making it specifically validated for high step-up transformer ratios ≥5:1. This design improvement prevents false triggering of the current comparator in applications like 48VIN/5VOUT with 8:1 turns ratio-where the standard LT8304ES8E#PBF may exhibit instability. Both share identical pinout, package, and core regulation architecture.
Does LT8304ES8E-1#PBF require an opto-isolator or third transformer winding for regulation?
No, the LT8304ES8E-1#PBF does not require an opto-isolator or third transformer winding. It achieves isolated output voltage regulation by sampling the flyback pulse amplitude directly from the primary-side SW node. This proprietary primary-side sensing method eliminates opto-isolator aging, nonlinearity, and dynamic response limitations while reducing component count and board area-confirmed in the LT8304/LT8304-1 datasheet Figure 1 and Block Diagram.
What is the purpose of the TC pin on LT8304ES8E-1#PBF, and how is it used?
Pin 8 (TC) on the LT8304ES8E-1#PBF outputs a proportional-to-absolute-temperature (PTAT) voltage: 1.00V at 25°C with +3.35mV/°C coefficient. It is used with an external resistor (RTC) between TC and RREF to compensate for the negative temperature coefficient of the output diode forward voltage (VF ≈ –2mV/°C), improving output voltage stability over temperature-especially critical for 3.3V and 5V outputs. The datasheet provides exact equations for RTC calculation in Application Information Section 11.
What is the maximum isolated output power achievable with LT8304ES8E-1#PBF?
The LT8304ES8E-1#PBF delivers up to 24W of isolated output power, as specified in the Absolute Maximum Ratings and Typical Application sections of the datasheet. This assumes optimal design conditions: 85% efficiency, appropriate transformer turns ratio (e.g., 6:1 for 72VIN/5VOUT), proper thermal management via the exposed pad, and operation within the 3V–100V input range. Real-world output power varies with input voltage, output voltage, and transformer design-see Figures 1–4 in the datasheet for detailed curves.
How does LT8304ES8E-1#PBF manage efficiency at light load?
The LT8304ES8E-1#PBF maintains high light-load efficiency via low-ripple Burst Mode® operation: it alternates between active switching cycles and sleep mode, reducing effective quiescent current to 116µA. Unlike conventional burst modes, this implementation preserves low output voltage ripple (<15mVPP) by enforcing minimum on-time and off-time constraints, ensuring accurate flyback pulse sampling. The 11kHz minimum switching frequency determines sampling rate and defines the <0.5% full-load minimum load specification.
LT8304ES8E-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive or Negative, Isolation Capable
- Topology:
- Flyback
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 100V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 150V (Switch)
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 11kHz ~ 350kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
LT8304ES8E-1#PBF FAQ
1.How can I place an order for LT8304ES8E-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8304ES8E-1#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 LT8304ES8E-1#PBF reliable?
The price and inventory of LT8304ES8E-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8304ES8E-1#PBF is usually 5 days.
3.What payment methods are accepted for LT8304ES8E-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8304ES8E-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8304ES8E-1#PBF?
LT8304ES8E-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8304ES8E-1#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 LT8304ES8E-1#PBF?
For technical support, including LT8304ES8E-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8304ES8E-1#PBF requirements.
6.How does Aetrix verify that LT8304ES8E-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT8304ES8E-1#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 LT8304ES8E-1#PBF meets industry standards.
7.What is the process for return or replacement of LT8304ES8E-1#PBF?
All LT8304ES8E-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8304ES8E-1#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 LT8304ES8E-1#PBF part is unused and in its original packaging.
Return procedure for LT8304ES8E-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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