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Analog Devices Inc. LT8570IDD#TRPBF
- Part No.:
- LT8570IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8570IDD#TRPBF.pdf
- Description:
- IC REG BOOST CUK ADJ 750MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,706
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Product details
Overview
LT8570IDD#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 user-configurable undervoltage lockout. It delivers stable bias power for TFT-LCD panels and GPS receivers operating from 2.55V to 40V input.
For engineers reviewing the LT8570IDD#TRPBF datasheet, LT8570IDD#TRPBF pinout, LT8570IDD#TRPBF application, or LT8570IDD#TRPBF equivalent, key selection criteria include its 65V switch rating, 0.5A current limit, thermal performance in DFN-8 (3mm × 3mm), feedback architecture supporting both positive and negative output configurations, and compatibility with LT3580/LT8580 layouts.
Technical Context
The LT8570IDD#TRPBF employs constant-frequency current-mode control with internal slope compensation to ensure stability at duty cycles >50%. Its dual-amplifier FBX architecture enables seamless reconfiguration between noninverting (boost/SEPIC) and inverting topologies by changing external resistor connections - no change to IC or layout required.
It integrates frequency foldback during soft-start and low-VCE(SAT) (250mV @ 0.4A) NPN switch with built-in thermal shutdown (~165°C). The SHDN pin accepts slowly ramping inputs and supports programmable UVLO via external resistor divider, while SYNC pin allows precise external clock synchronization with 35–65% duty cycle tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Rating | 65V collector-emitter breakdown - supports wide-input industrial and automotive supply rails up to 40V VIN. |
| Current Limit | 0.5A typical - sets maximum peak switch current; enables 125mA continuous output in 12V boost configuration at 5V input. |
| Switching Frequency | 200kHz–1.5MHz adjustable via RT resistor or external SYNC clock - balances efficiency vs. size for compact bias supplies. |
| Feedback Voltage | 1.204V (noninverting) or 3mV (inverting) - enables single-resistor VOUT programming for both polarity configurations. |
| Input Voltage Range | 2.55V to 40V - accommodates battery-backed systems, DSL modems, and unregulated 12V/24V industrial rails. |
| Soft-Start Current | 6µA typical - charges external SS capacitor linearly to ~2.1V, enabling controlled ramp-up of output voltage without inrush. |
| Thermal Resistance θJA | 43°C/W (DD package) - requires exposed pad soldered to PCB ground plane for reliable operation at full load in ambient ≤85°C. |
Pinout & Package
LT8570IDD#TRPBF is housed in an 8-lead, 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 9 = GND). The package supports high-power density designs and requires mandatory soldering of the exposed pad to the PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (Pin 1) | Configurable feedback input | Accepts either 1.204V reference (noninverting) or 3mV reference (inverting); determines output polarity and regulation setpoint via single resistor. |
| VC (Pin 2) | Error amplifier output | Connects external RC compensation network; directly controls PWM comparator threshold for loop stability. |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and switch driver; must be locally bypassed with low-ESR ceramic capacitor near pin. |
| SW (Pin 4) | Switch collector node | High-slew-rate NPN collector output; connects to inductor/diode; trace minimization critical for EMI reduction. |
| SHDN (Pin 5) | Enable/disable control | Hysteresis-enabled logic input (1.21V–1.40V threshold); restarts soft-start on rising edge; supports slow-ramping enable signals. |
| RT (Pin 6) | Oscillator timing | Resistor-to-ground sets free-running frequency; open-circuit disables oscillator; not floating. |
| SS (Pin 7) | Soft-start ramp | Charged by internal 280kΩ current source; external capacitor sets startup time; discharged on shutdown for glitch immunity. |
| SYNC (Pin 8) | External clock input | Accepts TTL/CMOS-compatible clock (1.3V high / 0.4V low); overrides internal oscillator when driven; <0.4V reverts to free-run mode. |
Key Features
| Feature | Design Value |
|---|---|
| Triple topology support | Single IC implements boost, SEPIC, or inverting conversion - eliminates need for multiple part numbers in multi-rail bias designs. |
| Programmable UVLO | SHDN pin bias and hysteresis allow resistor-divider-based turn-on threshold tuning - supports custom brown-out behavior without external comparators. |
| Frequency foldback | Reduces switching frequency to 1/6 nominal during soft-start or low-FBX conditions - improves minimum duty cycle control and start-up reliability. |
| Low VCE(SAT) switch | 250mV saturation voltage at 0.4A - reduces conduction loss and thermal stress in high-current bias applications like TFT-LCD gate drivers. |
| Pin compatibility | Footprint- and function-compatible with LT3580 and LT8580 - enables drop-in upgrades or design reuse across product generations. |
Applications
| TFT-LCD Bias Supply | GPS Receiver Power |
|---|---|
|
Use Scenario: Generating ±15V and +25V bias rails from a 3.3V or 5V system rail for LCD column/row drivers and gamma correction circuits. IC Role / Device Role / Timing Role: Configured as dual-output inverting/boost converter; regulates both positive and negative outputs using shared FBX architecture and independent feedback resistors. Use Value: Eliminates need for separate charge-pump ICs or transformer-based solutions; achieves <1% output regulation over temperature with single IC and minimal external components. |
Use Scenario: Providing clean, low-noise 3.3V or 5V supply to GPS RF front-end and baseband processor under varying battery voltage (3.0V–4.2V). IC Role / Device Role / Timing Role: Operated as boost converter with tight line/load regulation; uses frequency synchronization to avoid interference with GPS L1 band (1.575GHz). Use Value: Delivers >85% efficiency at 100mA load; integrated soft-start prevents GPS cold-start failure due to supply droop; SYNC pin enables noise-free timing alignment. |
| DSL Modem Local Supply | VFD Display Bias Generator |
|
Use Scenario: Deriving isolated 12V and –5V rails from 5V USB or wall adapter input for analog line interface circuitry and PHY layer ICs. IC Role / Device Role / Timing Role: Implemented as SEPIC converter to maintain regulation during input dips below output voltage (e.g., brown-out events). Use Value: Provides inherent input-output disconnect during shutdown; supports wide input range (2.55V–40V); maintains stable output even during transient line sags. |
Use Scenario: Generating high-voltage AC waveform (e.g., 30VPP) for vacuum fluorescent display segments from a 5V microcontroller rail. IC Role / Device Role / Timing Role: Used in inverting configuration driving center-tapped transformer; FBX pin referenced to virtual ground for symmetrical bipolar output. Use Value: Enables compact, low-component-count VFD driver without external op-amps or discrete transistors; leverages internal 65V switch for safe transformer primary drive. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3589EUF#PBF | 4-channel buck-boost PMIC with I2C interface; 600mA per channel; no 65V switch; fixed 2.25MHz fSW. | Targeted at multi-rail portable systems (e.g., smartphones); lacks SEPIC/inverting support and high-voltage capability. | Select LTC3589EUF#PBF only when digital control, multiple regulated outputs, and space-constrained PCBs outweigh need for 65V operation and topology flexibility. |
| LT8330EDD#TRPBF | 60V, 1.5A boost/SEPIC/inverting converter; higher current, wider fSW (300kHz–3MHz); different pinout; no SYNC pin. | Better suited for higher-power bias rails (>200mA) where thermal headroom and peak current margin are critical. | Choose LT8330EDD#TRPBF when output current exceeds 150mA or when 3MHz switching enables smaller magnetics - but verify layout changes due to non-pin-compatible footprint. |
Compared with LTC3589EUF#PBF and LT8330EDD#TRPBF, the LT8570IDD#TRPBF uniquely balances 65V capability, triple-topology flexibility, and compact DFN packaging - making it optimal for mid-power analog bias generation where programmability, voltage range, and board area are jointly constrained.
Availability
LT8570IDD#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 across industrial temperature ranges (–40°C to 125°C).
Supply support for LT8570IDD#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 all Linear DC/DC converter products, including robust process control and long-term product assurance.
The LT8570 series was designed specifically for compact, high-voltage bias supply applications in display, navigation, and telecom infrastructure - emphasizing topology versatility, thermal efficiency in small packages, and ease of layout reuse.
FAQ
What is the maximum input voltage supported by the LT8570IDD#TRPBF?
The LT8570IDD#TRPBF supports an absolute maximum input voltage of 40V on the VIN pin, with guaranteed operation across 2.55V to 40V. This wide range enables direct use with 24V industrial rails, 12V automotive systems (with transient protection), and battery-powered GPS modules. Exceeding 40V risks permanent damage per Absolute Maximum Ratings.
Can the LT8570IDD#TRPBF generate negative output voltages?
Yes - the LT8570IDD#TRPBF supports inverting topology via its dual-reference FBX pin (3mV for negative regulation). When configured with appropriate external components (e.g., dual inductors and diode), it delivers tightly regulated negative outputs such as –5V or –15V from a positive input, commonly used in TFT-LCD source/gate drivers and VFD displays.
Is the LT8570IDD#TRPBF pin-compatible with other Linear DC/DC converters?
Yes - the LT8570IDD#TRPBF shares identical pinout and footprint with LT3580 and LT8580. This enables direct replacement in existing designs without PCB revision, preserving layout investment while upgrading to improved current capability (0.5A vs. 0.3A) and extended frequency range (up to 1.5MHz).
How does the soft-start function work on the LT8570IDD#TRPBF?
The LT8570IDD#TRPBF implements soft-start via internal 6µA current source charging an external capacitor on the SS pin to ~2.1V. This linear ramp controls error amplifier gain and limits peak switch current during startup, preventing output overshoot and inductor saturation. Discharge occurs automatically on shutdown for robust glitch immunity.
What thermal considerations apply to the LT8570IDD#TRPBF in DFN-8 package?
The LT8570IDD#TRPBF in DD package has θJA = 43°C/W and requires the exposed pad (Pin 9) to be soldered to a solid PCB ground plane. Without proper thermal vias and copper area, junction temperature can exceed 125°C at full load in ambient >70°C - derating curves in the datasheet must be followed for continuous 0.5A operation.
LT8570IDD#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)
LT8570IDD#TRPBF FAQ
1.How can I place an order for LT8570IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8570IDD#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 LT8570IDD#TRPBF reliable?
The price and inventory of LT8570IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8570IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8570IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8570IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8570IDD#TRPBF?
LT8570IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8570IDD#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 LT8570IDD#TRPBF?
For technical support, including LT8570IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8570IDD#TRPBF requirements.
6.How does Aetrix verify that LT8570IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8570IDD#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 LT8570IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8570IDD#TRPBF?
All LT8570IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8570IDD#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 LT8570IDD#TRPBF part is unused and in its original packaging.
Return procedure for LT8570IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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