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Analog Devices Inc. LT8570EDD#TRPBF
- Part No.:
- LT8570EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8570EDD#TRPBF.pdf
- Description:
- IC REG BOOST CUK ADJ 750MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:470
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Product details
Overview
LT8570EDD#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 integrates a high-voltage NPN switch, adjustable 200kHz–1.5MHz oscillator, soft-start, synchronization input, and programmable UVLO. It delivers stable bias supplies for TFT-LCD and VFD panels with input range 2.55V–40V and 1.204V precision feedback reference.
For engineers reviewing the LT8570EDD#TRPBF datasheet, LT8570EDD#TRPBF pinout, LT8570EDD#TRPBF application, or LT8570EDD#TRPBF equivalent, this page provides verified topology flexibility, thermal-enhanced DFN package details, current-mode control behavior, and validated alternative options for industrial power conversion designs requiring wide VIN and dual-polarity output capability.
Technical Context
The LT8570EDD#TRPBF uses constant-frequency current-mode control with internal slope compensation to ensure stability across >50% duty cycles in boost/SEPIC/inverting configurations. Its dual-feedback architecture supports both positive (1.204V) and negative (3mV) FBX references, enabling seamless topology reconfiguration via external resistor routing without changing the IC.
It features frequency foldback during soft-start (reducing fOSC to 1/6 nominal) and a high-gain SHDN pin accepting slowly ramping enable signals. The integrated 280kΩ soft-start pull-up and 100ns minimum on/off times support controlled startup under varying load and input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Rating | 65V collector-emitter breakdown; enables direct 48V rail or automotive transient-tolerant designs. |
| Current Limit | 0.5A typical (LT8570 variant); sets maximum peak switch current for inductor sizing and fault protection. |
| Input Range | 2.55V to 40V; supports single-cell Li-ion up to 36V industrial rails without pre-regulation. |
| Feedback Reference | 1.204V (positive) or 3mV (negative); enables precise output regulation in noninverting or inverting topologies. |
| Switching Frequency | 200kHz–1.5MHz (adjustable via RT resistor or external SYNC clock); balances EMI, efficiency, and component size. |
| Package | 8-lead 3mm × 3mm DFN with exposed GND pad; achieves θJA = 43°C/W for thermally constrained layouts. |
| Quiescent Current | 1.7mA typical (active), <1µA (shutdown); minimizes standby loss in battery-powered systems. |
Pinout & Package
LT8570EDD#TRPBF is housed in an 8-lead, 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 9, GND). The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity. Pin pitch is 0.5mm; package conforms to JEDEC MO-229 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (1) | Positive/Negative Feedback Input | Accepts either 1.204V (boost/SEPIC) or 3mV (inverting) reference; determines output voltage via single RFBX. |
| VC (2) | Error Amplifier Output | Connects to RC network for loop compensation; drives internal PWM comparator. |
| VIN (3) | Main Input Supply | Supplies internal circuitry and switch driver; requires local ceramic bypass (≥0.47µF). |
| SW (4) | Switch Collector Node | High-slew NPN collector output; connects to inductor/diode; minimize trace area to reduce EMI. |
| SHDN (5) | Enable/Shutdown Control | Active-high logic with 1.21V–1.40V hysteresis; supports slow-ramping UVLO using external resistor divider. |
| RT (6) | Oscillator Timing Input | Resistor-to-GND sets free-running frequency; also accepts SYNC signal when driven low. |
| SS (7) | Soft-Start Capacitor Node | Charged by internal 280kΩ current source to ~2.1V; controls ramp rate of output voltage. |
| SYNC (8) | External Clock Input | Accepts 0.4V–1.3V logic levels; synchronizes switching to external clock or reverts to internal oscillator. |
| GND (9, Exposed Pad) | Power & Signal Ground | Thermal and electrical ground reference; must be soldered to PCB ground plane for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports boost, SEPIC, and inverting converters via external component reconfiguration-no change to LT8570EDD#TRPBF footprint or BOM. |
| Programmable UVLO | SHDN pin threshold set by external resistor divider; enables custom input undervoltage lockout without additional components. |
| Frequency Foldback | Reduces switching frequency to 1/6 nominal during soft-start, lowering minimum duty cycle and improving startup control under heavy loads. |
| Low VCE(SAT) | 250mV at 0.4A ensures minimal conduction loss and higher efficiency in high-current boost stages. |
| Thermally Enhanced DFN | 3mm × 3mm package with exposed GND pad delivers 43°C/W junction-to-ambient thermal resistance-critical for compact, high-power-density designs. |
Applications
| TFT-LCD Bias Supply | VFD Panel Supply |
|---|---|
|
Use Scenario: Generating +15V and –10V rails from a 5V or 12V system supply for LCD gate/source drivers and common electrode bias. IC Role / Device Role / Timing Role: Configured as dual-output SEPIC/inverting regulator; LT8570EDD#TRPBF provides isolated polarity outputs with single-inductor simplicity. Use Value: Eliminates need for separate positive/negative converters; leverages 65V switch rating to handle high-voltage transients during display startup. |
Use Scenario: Powering vacuum fluorescent displays in industrial HMIs where input varies from 5V USB to 24V field bus. IC Role / Device Role / Timing Role: Used in boost configuration to generate stable 30V–40V anode supply; LT8570EDD#TRPBF's wide 2.55V–40V input accommodates unregulated sources. Use Value: Maintains regulated output across full input range without external LDO pre-regulation; soft-start prevents inrush into large VFD filament capacitors. |
| GPS Receiver Power | DSL Modem Local Supply |
|
Use Scenario: Providing clean, low-noise 3.3V supply for GPS RF front-end and baseband ICs in portable navigation devices. IC Role / Device Role / Timing Role: Operated in boost mode with external LC filter; LT8570EDD#TRPBF's current-mode control rejects input ripple from noisy battery or PMIC sources. Use Value: Achieves >85% efficiency at 100mA load while meeting GPS sensitivity requirements; SYNC input allows noise-free timing alignment with baseband clock. |
Use Scenario: Generating isolated ±12V analog supplies for DSL line drivers and receivers in residential gateways. IC Role / Device Role / Timing Role: Configured as inverting converter for negative rail; LT8570EDD#TRPBF's dual-feedback architecture enables precise matching to positive rail tolerance. Use Value: Reduces bill-of-materials by replacing dual converters with one IC; 0.5A current limit supports peak line-driver transients without dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3533EDD#TRPBF | 40V max switch, 0.6A current limit, fixed 1.5MHz fOSC, no SYNC pin, same DFN package. | Better suited for high-frequency, low-ripple 5V–12V boost; lacks SEPIC/inverting flexibility and programmable frequency. | Select LTC3533EDD#TRPBF only when fixed 1.5MHz operation and higher current are prioritized over topology versatility. |
| LT3580EMS8E#TRPBF | Pin-compatible 65V, 0.5A boost/SEPIC controller; identical pinout but MSOP-8 package (no exposed pad), θJA = 35–40°C/W. | Same functional behavior but lower thermal performance; suitable where board space permits larger MSOP and airflow is available. | Choose LT3580EMS8E#TRPBF only if existing layout uses MSOP-8 and thermal derating is acceptable. |
Compared with LTC3533EDD#TRPBF and LT3580EMS8E#TRPBF, the LT8570EDD#TRPBF uniquely combines 65V/0.5A capability, triple-topology support, adjustable frequency, and thermal-enhanced DFN-making it optimal for space-constrained, multi-rail industrial bias applications where design reuse and thermal headroom are critical.
Availability
LT8570EDD#TRPBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, GPS receiver power management, and DSL modem local power generation requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across temperature.
Supply support for LT8570EDD#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 product support, datasheet documentation, and application engineering for legacy Linear parts including the LT8570 series.
The LT8570 product line was designed specifically for compact, high-voltage DC/DC bias generation in display, telecom, and instrumentation systems-emphasizing topology flexibility, thermal efficiency, and ease of layout in space-constrained applications.
FAQ
What topologies does the LT8570EDD#TRPBF support?
The LT8570EDD#TRPBF supports boost, SEPIC, and inverting converter topologies through external component reconfiguration. Its dual-feedback architecture-accepting either 1.204V (positive) or 3mV (negative) at the FBX pin-enables all three modes without changing the LT8570EDD#TRPBF itself. This eliminates the need for multiple part numbers in designs requiring flexible output polarity or input/output voltage relationships.
What is the maximum switching frequency of the LT8570EDD#TRPBF?
The LT8570EDD#TRPBF supports a switching frequency range of 200kHz to 1.5MHz. Frequency is set either by an external resistor from the RT pin to ground or by synchronizing to an external clock via the SYNC pin. The upper limit of 1.5MHz enables small magnetics and fast transient response, while the lower bound ensures stable operation with standard ceramic capacitors and low-ESR inductors in the LT8570EDD#TRPBF design.
Does the LT8570EDD#TRPBF require external compensation components?
Yes, the LT8570EDD#TRPBF requires external compensation: a series RC network plus a parallel capacitor connected between the VC pin and GND. Typical values are RC = 5k–50kΩ, Cseries = 470pF–2.2nF (1nF recommended), and Cparallel = 10pF–100pF (47pF recommended). This network stabilizes the voltage loop; the LT8570EDD#TRPBF's current-mode architecture eliminates need for slope compensation beyond the internal circuitry.
How is undervoltage lockout (UVLO) configured on the LT8570EDD#TRPBF?
UVLO is user-configurable via the SHDN pin: connect a resistor divider from VIN to GND, with the midpoint feeding SHDN. The LT8570EDD#TRPBF triggers shutdown below ~1.21V and resumes operation above ~1.40V (40mV hysteresis). This allows precise, adjustable input voltage thresholds without external comparators-directly leveraging the LT8570EDD#TRPBF's built-in high-gain SHDN input stage.
What package type and thermal characteristics does the LT8570EDD#TRPBF use?
The LT8570EDD#TRPBF uses an 8-lead, 3mm × 3mm plastic DFN package with exposed GND pad (Pin 9). Its thermal resistance is θJA = 43°C/W when the exposed pad is soldered to a 1-in² copper area. This package enables high power density in compact layouts-critical for display bias supplies where board space is limited and ambient temperatures may exceed 85°C. The LT8570EDD#TRPBF's rated junction temperature range is –40°C to 125°C.
LT8570EDD#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:
- 750mA (Switch)
- Frequency - Switching:
- 200kHz ~ 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT8570EDD#TRPBF FAQ
1.How can I place an order for LT8570EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8570EDD#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 LT8570EDD#TRPBF reliable?
The price and inventory of LT8570EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8570EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8570EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8570EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8570EDD#TRPBF?
LT8570EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8570EDD#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 LT8570EDD#TRPBF?
For technical support, including LT8570EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8570EDD#TRPBF requirements.
6.How does Aetrix verify that LT8570EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8570EDD#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 LT8570EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8570EDD#TRPBF?
All LT8570EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8570EDD#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 LT8570EDD#TRPBF part is unused and in its original packaging.
Return procedure for LT8570EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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