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Analog Devices Inc. LT8570EDD-1#TRPBF
- Part No.:
- LT8570EDD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8570EDD-1#TRPBF.pdf
- Description:
- IC REG BST CHARGE PUMP ADJ 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,426
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Product details
Overview
LT8570EDD-1#TRPBF from Analog Devices (formerly Linear Technology) is a 65V, 0.25A current-mode 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 voltage for TFT-LCD panels in industrial display systems.
For engineers reviewing the LT8570EDD-1#TRPBF datasheet, LT8570EDD-1#TRPBF pinout, LT8570EDD-1#TRPBF application, or LT8570EDD-1#TRPBF equivalent, key selection criteria include its 0.25A switch current limit, 2.55V–40V input range, 1.204V positive feedback reference, thermal shutdown at ~165°C, and compatibility with compact 3mm × 3mm DFN packaging for space-constrained power designs.
Technical Context
The LT8570EDD-1#TRPBF employs constant-frequency current-mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its dual-amplifier FBX architecture enables seamless reconfiguration between noninverting (boost/SEPIC) and inverting topologies via external resistor connection - no change to IC or layout required.
It integrates a high-gain SHDN pin accepting slowly ramping enable signals, frequency foldback during soft-start (reducing minimum duty cycle to 1/6 nominal), and a 280kΩ internal soft-start charging resistor. The VC pin provides direct access to the error amplifier output for precise loop compensation using RC networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Limit | 0.25A (guaranteed at 50% duty cycle; derates with temperature and duty cycle) |
| Input Voltage Range | 2.55V to 40V - supports wide-input industrial rails and battery-backed systems |
| Switch Breakdown Voltage | 65V - enables use in 24V/36V bus applications with margin for transients |
| Feedback Reference | 1.204V (positive mode) or 3mV (inverting mode) - sets output voltage with single resistor |
| Switching Frequency Range | 200kHz to 1.5MHz (free-running or synchronized) - balances EMI, efficiency, and component size |
| Soft-Start Charging Current | 6µA (typical) - determines ramp rate of SS capacitor for controlled inrush current |
| UVLO Threshold Hysteresis | 40mV - ensures clean startup/shutdown without chatter near trip point |
Pinout & Package
LT8570EDD-1#TRPBF is housed in an 8-lead, 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 9 = GND). The thermally enhanced construction achieves θJA = 43°C/W, enabling high-power-density operation without heatsinks in ambient temperatures up to 125°C junction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (Pin 1) | Configurable feedback input | Accepts either positive (1.204V ref) or negative (3mV ref) feedback for boost/SEPIC or inverting topologies |
| VC (Pin 2) | Error amplifier output | Connects external RC compensation network to stabilize voltage loop; critical for transient response |
| VIN (Pin 3) | Main input supply | Must be locally bypassed with low-ESR ceramic capacitor; powers internal circuitry and switch driver |
| SW (Pin 4) | Switch collector node | Connects to external inductor/diode; high di/dt node requiring minimized trace area to reduce EMI |
| SHDN (Pin 5) | Enable/disable control | High-gain input with 1.21V–1.40V active window and 40mV hysteresis; supports slow-ramping enable sources |
| RT (Pin 6) | Oscillator timing input | Resistor-to-ground sets free-running frequency; open-circuit disables oscillator |
| SS (Pin 7) | Soft-start capacitor node | Charged by 280kΩ internal current source to ~2.1V; controls ramp rate of output voltage |
| SYNC (Pin 8) | External clock input | Accepts 0.4V–1.3V logic-level clock; overrides internal oscillator when driven above threshold |
| GND (Exposed Pad, Pin 9) | Power and signal ground | Thermal pad must be soldered to PCB ground plane for thermal and electrical performance |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports boost, SEPIC, and inverting configurations via FBX resistor routing - no BOM change required |
| Programmable UVLO | SHDN pin allows resistor-divider-based undervoltage lockout with precise 1.21V–1.40V activation window |
| Frequency Foldback | Reduces switching frequency to 1/6 nominal during soft-start to improve controllability at low FBX voltages |
| Low VCE(SAT) | 250mV at 0.2A - minimizes conduction loss and improves efficiency in high-current phases |
| Thermal Protection | Automatic shutdown at ~165°C junction with hysteresis; full soft-start resumes after cooldown to ~160°C |
Applications
| TFT-LCD Bias Supply | VFD Display Power |
|---|---|
Use Scenario: Generating ±15V bias rails from a 5V or 12V system rail for active-matrix LCD column drivers and gate drivers. IC Role / Device Role / Timing Role: Configured as dual-inductor inverting converter to deliver low-ripple negative output while maintaining isolation from input. Use Value: Single-chip solution eliminates need for discrete charge pumps or transformer-based supplies, reducing board area by >40% vs. legacy approaches. |
Use Scenario: Providing regulated 30V–60V anode supply and –10V cathode bias for vacuum fluorescent displays in automotive instrument clusters. IC Role / Device Role / Timing Role: Operated in boost configuration with tight output regulation and fast load-step response. Use Value: 65V switch rating accommodates worst-case transients on 24V vehicle buses without external clamping. |
| GPS Receiver LNA Supply | DSL Line Card Local Bias |
Use Scenario: Delivering ultra-low-noise 3.3V or 5V supply to low-noise amplifiers in GPS front-end modules where EMI sensitivity is critical. IC Role / Device Role / Timing Role: Used in SEPIC topology to maintain regulation across varying battery voltage (3.0V–4.2V) while providing output disconnect in shutdown. Use Value: Integrated soft-start and frequency synchronization suppress startup noise and allow EMI filtering alignment with system clock. |
Use Scenario: Generating isolated ±12V bias for line interface ICs in DSLAM line cards operating from 48V telecom supply. IC Role / Device Role / Timing Role: Configured as inverting converter to generate negative rail; synchronized to system master clock to minimize beat frequencies. Use Value: Pin-compatible replacement for LT3580/LT8580 enables drop-in upgrade path with improved current limit accuracy and thermal robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8580EDD#TRPBF | 0.5A switch current limit, same 65V rating and pinout; higher quiescent current (1.7mA vs. 1.2mA) | Better suited for higher-output-current boost/SEPIC designs (>150mA); not recommended where 0.25A limit is intentional for fault containment | Select LT8580EDD#TRPBF only if load current exceeds 0.25A and thermal margin permits higher dissipation. |
| LT3580EDD#TRPBF | Same 0.25A/65V spec and footprint; lacks frequency foldback and has narrower input range (3V–40V) | Valid for fixed-frequency boost-only designs without soft-start optimization needs; no inverting topology support | Choose LT3580EDD#TRPBF only for cost-sensitive, legacy-replacement scenarios where foldback and topology flexibility are unnecessary. |
Compared with LT8580EDD#TRPBF and LT3580EDD#TRPBF, the LT8570EDD-1#TRPBF uniquely combines inverting topology support, frequency foldback for robust start-up, and extended 2.55V low-input capability - making it optimal for multi-rail bias generation in portable and industrial displays.
Availability
LT8570EDD-1#TRPBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, GPS receiver LNA power, and DSL line card local bias requiring stable component supply, long-term lifecycle assurance, and guaranteed RoHS-compliant sourcing.
Supply support for LT8570EDD-1#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 power products.
The LT8570 family was designed specifically for compact, high-voltage bias generation in display and communications infrastructure - emphasizing topology flexibility, thermal resilience, and ease of loop compensation.
FAQ
What topology configurations does the LT8570EDD-1#TRPBF support?
The LT8570EDD-1#TRPBF supports three distinct DC/DC topologies: boost, SEPIC, and inverting - all using the same IC and pinout. Configuration is determined solely by external component connections, particularly the resistor from VOUT to the FBX pin, which selects between 1.204V (noninverting) or 3mV (inverting) feedback reference. No hardware changes or alternate part numbers are needed to switch modes.
What is the maximum achievable output voltage with LT8570EDD-1#TRPBF in boost mode?
The LT8570EDD-1#TRPBF can generate output voltages up to 60V in boost configuration, constrained by its 65V switch breakdown rating and practical limits of external diode and capacitor voltage ratings. At VIN = 12V and fSW = 500kHz, typical designs achieve VOUT = 48V at 100mA with >82% efficiency. Output voltage is set by a single resistor from VOUT to FBX, calculated as RFBX = |VOUT − 1.204V| / 83.3µA.
How does the LT8570EDD-1#TRPBF handle thermal overload conditions?
The LT8570EDD-1#TRPBF incorporates thermal shutdown that activates at approximately 165°C junction temperature. When triggered, the IC halts switching and holds the SHDN state until the die cools to ~160°C, at which point it initiates a full soft-start sequence. This protection operates independently of current limit and preserves both the IC and external components during sustained overloads or poor PCB thermal design.
Can the LT8570EDD-1#TRPBF be synchronized to an external clock, and what are the requirements?
Yes, the LT8570EDD-1#TRPBF supports external clock synchronization via the SYNC pin (Pin 8). The input must meet TTL-compatible thresholds: high level ≥1.3V, low level ≤0.4V, and duty cycle between 35% and 65%. The external clock frequency must be ≥75% of the internal oscillator's nominal frequency to ensure reliable locking. Driving SYNC below 0.4V reverts the device to free-running mode.
What is the purpose of the frequency foldback feature in LT8570EDD-1#TRPBF?
Frequency foldback in the LT8570EDD-1#TRPBF reduces the switching frequency to 1/6 of its nominal value when the FBX pin voltage falls within 300mV–920mV - a condition common during soft-start or heavy-load transients. This lowers the minimum achievable duty cycle, improving control authority over peak switch current and preventing instability or current-limit cycling during startup or fault recovery.
LT8570EDD-1#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, Charge Pump, 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:
- 375mA (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-1#TRPBF FAQ
1.How can I place an order for LT8570EDD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8570EDD-1#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-1#TRPBF reliable?
The price and inventory of LT8570EDD-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8570EDD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8570EDD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8570EDD-1#TRPBF?
LT8570EDD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8570EDD-1#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-1#TRPBF?
For technical support, including LT8570EDD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8570EDD-1#TRPBF requirements.
6.How does Aetrix verify that LT8570EDD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8570EDD-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8570EDD-1#TRPBF?
All LT8570EDD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8570EDD-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LT8570EDD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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