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Analog Devices Inc. LT8570HDD#TRPBF
- Part No.:
- LT8570HDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8570HDD#TRPBF.pdf
- Description:
- IC REG BOOST CUK ADJ 500MA 8DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT8570HDD#TRPBF from Analog Devices (formerly Linear Technology) is a 65V, 0.5A monolithic PWM DC/DC converter IC supporting boost, SEPIC, and inverting topologies. It features adjustable 200kHz–1.5MHz switching frequency, integrated soft-start, synchronization capability, and wide 2.55V–40V input range. It delivers stable bias voltage for TFT-LCD panels in automotive infotainment systems.
For engineers reviewing the LT8570HDD#TRPBF datasheet, LT8570HDD#TRPBF pinout, LT8570HDD#TRPBF application, or LT8570HDD#TRPBF equivalent, key selection factors include its 150°C guaranteed junction temperature rating, 0.5A current limit, 65V switch rating, SHDN pin hysteresis tolerance for slow-ramping control signals, and compatibility with thermally demanding industrial power rails.
Technical Context
The LT8570HDD#TRPBF employs constant-frequency current-mode control with internal slope compensation to ensure stability at duty cycles >50%. Its dual-amplifier FBX architecture supports both noninverting (1.204V reference) and inverting (3mV reference) feedback configurations without external component changes.
It integrates frequency foldback during startup (reducing fOSC to 1/6 nominal), a high-gain SHDN pin with 40mV hysteresis and programmable UVLO, and a 280kΩ internal soft-start charging resistor. The 0.04Ω typical VCE(SAT) switch enables high efficiency in compact 3mm × 3mm DFN packages with exposed thermal pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Rating | 65V collector-emitter breakdown - supports input-to-output isolation in 48V industrial bus and automotive battery-supplied bias supplies. |
| Current Limit | 0.5A (LT8570 variant) - enables ≥125mA output at 12V in boost mode with margin for transient loads. |
| Input Voltage Range | 2.55V to 40V - accommodates cold-crank (6V) and load-dump (36V) conditions in automotive electronics. |
| Switching Frequency | 200kHz to 1.5MHz - allows optimization between EMI filtering size and efficiency; RT-resistor programmable or external SYNC controllable. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood automotive and high-ambient industrial environments. |
| VCE(SAT) | 250mV at 0.4A - minimizes conduction loss and thermal rise in thermally constrained DFN package. |
| Feedback Reference | 1.204V (noninverting) / 3mV (inverting) - enables precise output regulation across topology variants with single RFBX resistor. |
Pinout & Package
LT8570HDD#TRPBF is housed in an 8-lead 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 9 = GND), optimized for high-power density and thermal dissipation (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (1) | Positive/Negative Feedback Input | Accepts either pull-up (1.204V ref for boost/SEPIC) or pull-down (3mV ref for inverting) configuration - enables topology re-use without IC change. |
| VC (2) | Error Amplifier Output | Connects external RC network for loop compensation - critical for stability across load and line transients in all three topologies. |
| VIN (3) | Main Power Input | Supplies internal circuitry and switch driver - requires local low-ESR ceramic bypass (≥0.47µF) placed adjacent to pin. |
| SW (4) | Switch Collector Node | High-slew-rate NPN collector output - demands minimal trace area and direct connection to inductor/diode to reduce EMI. |
| SHDN (5) | Enable/UVLO Control Input | High-gain input accepts slow-rising enable signals; 1.21V–1.40V threshold window with 40mV hysteresis enables robust system-level sequencing. |
| RT (6) | Oscillator Timing Input | Resistor-to-ground sets free-running frequency; open-circuit disables oscillator - no floating allowed. |
| SS (7) | Soft-Start Capacitor Node | Charged by internal 280kΩ current source to ~2.1V - external capacitor (100nF–1µF) controls ramp rate and inrush limiting. |
| SYNC (8) | External Clock Input | Accepts 0.4V–1.3V logic-compatible clock; drives internal oscillator when high - enables EMI reduction via spread-spectrum or fixed-frequency coordination. |
| GND (9, Exposed Pad) | Power & Signal Ground | Thermal and electrical ground - must be soldered to large PCB copper pour for thermal performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports boost, SEPIC, and inverting converters - reduces BOM count and design cycle time for multi-rail bias generation. |
| Startup Robustness | Integrated frequency foldback + soft-start + programmable UVLO - prevents output overshoot and inrush during cold-start or brownout recovery. |
| Thermal Reliability | 150°C guaranteed operating junction temperature - validated for continuous operation in sealed enclosures and engine-bay proximity applications. |
| EMI Mitigation | Synchronizable switching + minimum on/off times (100ns each) + slope-compensated current mode - simplifies compliance with CISPR 25 Class 5. |
| Layout Simplicity | Single feedback resistor sets VOUT; no external current sense required - eliminates layout-sensitive traces and improves production yield. |
Applications
| TFT-LCD Bias Supply | VFD Display Bias Supply |
|---|---|
Use Scenario: Generating ±15V rails from 12V automotive battery for active-matrix LCD panels in instrument clusters. IC Role / Device Role / Timing Role: Configured as dual-inductor inverting converter to deliver low-ripple negative rail while maintaining tight regulation on positive rail. Use Value: Eliminates need for separate negative charge-pump IC; 0.5A switch supports full-panel brightness without thermal derating at 105°C ambient. |
Use Scenario: Providing isolated high-voltage bias (up to 100V) for vacuum fluorescent displays in industrial HMIs. IC Role / Device Role / Timing Role: Operated in boost mode with external diode/capacitor multiplier stages to extend output beyond 65V switch rating. Use Value: Leverages 65V switch and 40V input rating to withstand 36V load-dump transients while delivering stable filament and grid voltages. |
| GPS Receiver Local Supply | DSL Modem Line Driver Supply |
Use Scenario: Generating clean 3.3V LDO input from noisy 5V USB or PoE-derived rail in portable GPS modules. IC Role / Device Role / Timing Role: Used in SEPIC configuration to maintain regulation during input dips below 3.3V (e.g., battery sag) and above 5V (e.g., surge). Use Value: Inherent input-output isolation prevents GPS RF section noise coupling; 200kHz–1.5MHz frequency tuning avoids GPS L1 band interference. |
Use Scenario: Supplying ±12V analog front-end rails for DSL line drivers in residential gateways operating from 12V wall adapters. IC Role / Device Role / Timing Role: Dual LT8570HDD#TRPBF units configured as inverting and boost converters to generate complementary rails. Use Value: Pin-compatible with LT3580/LT8580 - enables drop-in upgrade path for higher current and extended temperature support in legacy designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8570IDD#TRPBF | Same 0.5A/65V specs but rated for –40°C to 125°C junction temperature. | Lacks 150°C qualification - unsuitable for under-hood or high-ambient industrial deployments. | Select only if thermal environment stays ≤125°C; lower cost alternative where extended temp not required. |
| LT8570HMS8E#TRPBF | Identical electrical specs and 150°C rating, but in 8-lead MSOP package (θJA = 35–40°C/W). | Higher thermal resistance than DFN; larger footprint; no exposed pad - limits power handling in space-constrained layouts. | Choose for legacy MSOP-compatible boards or when DFN reflow process is unavailable. |
Compared with LT8570IDD#TRPBF and LT8570HMS8E#TRPBF, the LT8570HDD#TRPBF uniquely combines 150°C operation, lowest thermal resistance (43°C/W), and smallest footprint - making it optimal for high-reliability, high-density automotive and industrial bias supply designs.
Availability
LT8570HDD#TRPBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, GPS receiver local power, and DSL modem line driver supplies requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT8570HDD#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for the LT® portfolio of high-performance power management ICs.
The LT8570 family was designed specifically for compact, high-voltage DC/DC bias generation in display, communications, and automotive subsystems - emphasizing topology flexibility, thermal resilience, and ease of layout.
FAQ
What is the maximum guaranteed junction temperature for LT8570HDD#TRPBF?
The LT8570HDD#TRPBF is fully specified and guaranteed over a junction temperature range of –40°C to +150°C. This rating is validated per Linear Technology's characterization and statistical process controls, enabling use in under-hood automotive and high-ambient industrial environments where standard 125°C-rated parts would require derating or forced cooling. The LT8570HDD#TRPBF maintains all electrical specifications across this full range.
Can LT8570HDD#TRPBF be used in an inverting configuration, and how is the feedback set?
Yes, the LT8570HDD#TRPBF supports inverting topology via its dual-reference FBX pin, which uses a 3mV internal reference for negative output regulation. To configure, connect a single resistor RFBX from VOUT (negative rail) to FBX, calculated as RFBX = (|VOUT| + 3mV) / 83.3µA. This eliminates need for external op-amps or level shifters. The LT8570HDD#TRPBF automatically selects the correct amplifier path based on FBX voltage polarity.
What is the purpose of the frequency foldback feature in LT8570HDD#TRPBF?
Frequency foldback in the LT8570HDD#TRPBF reduces the switching frequency to 1/6 of nominal when the FBX pin voltage falls within 300mV–920mV - typically during startup or overload. This extends minimum off-time, improving switch current control and preventing premature current-limit triggering. It ensures smooth soft-start and enhances reliability during fault conditions. The LT8570HDD#TRPBF resumes full frequency once regulation is established.
How does the SHDN pin of LT8570HDD#TRPBF differ from standard enable inputs?
The SHDN pin of LT8570HDD#TRPBF features high-gain input circuitry with 40mV hysteresis and a precise 1.21V–1.40V activation window, allowing reliable operation with slowly varying control signals (e.g., thermistor-based thermal shutdown or RC-delayed power sequencing). Unlike basic digital enables, it tolerates noise and gradual voltage ramps without chatter. The LT8570HDD#TRPBF also restarts soft-start upon SHDN re-assertion, ensuring controlled turn-on.
Is LT8570HDD#TRPBF pin-compatible with other members of the LT8570 family?
Yes, the LT8570HDD#TRPBF shares identical pinout and footprint with all LT8570 and LT8570-1 variants in the 8-lead DFN (DD) package, including LT8570EDD#TRPBF and LT8570IDD#TRPBF. This enables direct replacement for temperature grade upgrades without PCB revision. It is also pin-compatible with LT3580 and LT8580, facilitating migration paths for higher-current or enhanced-feature designs while retaining layout integrity.
LT8570HDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Boost, Cuk, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.55V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 0.003V, 1.204V
- Voltage - Output (Max):
- 65V (Switch)
- Current - Output:
- 500mA (Switch)
- Frequency - Switching:
- 200kHz ~ 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT8570HDD#TRPBF FAQ
1.How can I place an order for LT8570HDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8570HDD#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 LT8570HDD#TRPBF reliable?
The price and inventory of LT8570HDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8570HDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8570HDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8570HDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8570HDD#TRPBF?
LT8570HDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8570HDD#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 LT8570HDD#TRPBF?
For technical support, including LT8570HDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8570HDD#TRPBF requirements.
6.How does Aetrix verify that LT8570HDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8570HDD#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 LT8570HDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8570HDD#TRPBF?
All LT8570HDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8570HDD#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 LT8570HDD#TRPBF part is unused and in its original packaging.
Return procedure for LT8570HDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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