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Analog Devices Inc. LT8570IDD-1#TRPBF
- Part No.:
- LT8570IDD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8570IDD-1#TRPBF.pdf
- Description:
- IC REG BST CHARGE PUMP ADJ 8DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT8570IDD-1#TRPBF from Analog Devices (formerly Linear Technology) is a 65V, 0.25A current-mode PWM DC/DC converter IC optimized for boost, SEPIC, and inverting topologies in space-constrained industrial and portable power supplies. It features an integrated 65V NPN switch, adjustable 200kHz–1.5MHz switching frequency, soft-start, synchronization capability, and user-configurable undervoltage lockout. It delivers regulated bias voltage for TFT-LCD panels in automotive infotainment systems.
For engineers reviewing the LT8570IDD-1#TRPBF datasheet, LT8570IDD-1#TRPBF pinout, LT8570IDD-1#TRPBF application, or LT8570IDD-1#TRPBF equivalent, key selection considerations include its 0.25A current limit (vs. 0.5A in LT8570), thermal performance in the –40°C to 125°C industrial temperature grade, DFN package thermal resistance (θJA = 43°C/W), and FBX pin dual-mode feedback architecture supporting both positive and negative output configurations.
Technical Context
The LT8570IDD-1#TRPBF employs constant-frequency current-mode control with internal slope compensation to ensure stability at duty cycles >50%. Its error amplifier drives the VC pin with 200 µmhos transconductance and 60 V/V gain, enabling precise regulation via the FBX pin's dual-reference architecture (1.204V for noninverting, 3mV for inverting modes).
It integrates frequency foldback during soft-start (reducing fOSC to 1/6 nominal) and supports external synchronization via the SYNC pin (1.3V high threshold, 0.4V low threshold). The SHDN pin accepts slowly ramping inputs with 40mV hysteresis and enables programmable UVLO using an external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Rating | 65V collector-emitter breakdown; supports input-to-output voltage differentials up to 65V in inverting/SEPIC topologies. |
| Current Limit | 0.25A typical (LT8570-1 variant); limits peak switch current to protect internal NPN transistor and external magnetics. |
| Input Voltage Range | 2.55V to 40V; enables direct operation from 3.3V, 5V, 12V, or 24V rails without pre-regulation. |
| Switching Frequency | 200kHz–1.5MHz (adjustable via RT pin resistor or external SYNC clock); higher frequencies allow smaller inductors and capacitors. |
| Feedback Reference | 1.204V (noninverting) or 3mV (inverting) at FBX pin; enables single-resistor output voltage setting for both polarity configurations. |
| Soft-Start Current | 4–8 µA (typical); charges external SS capacitor to ~2.1V, controlling ramp rate of output voltage and limiting inrush current. |
| Thermal Grade | –40°C to 125°C junction temperature; qualified for industrial environments with derating above 125°C. |
Pinout & Package
LT8570IDD-1#TRPBF is housed in an 8-lead 3mm × 3mm plastic DFN package with exposed GND pad (Pin 9), requiring soldering to PCB for thermal and electrical integrity. θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (1) | Positive/Negative Feedback Input | Accepts either 1.204V reference (boost/SEPIC) or 3mV reference (inverting) to set output voltage with single resistor RFBX. |
| VC (2) | Error Amplifier Output | Drives external RC compensation network; 200 µmhos transconductance enables stable loop response across topologies. |
| VIN (3) | Input Supply | 2.55V–40V input rail; requires local ceramic bypass (0.22–1µF) placed adjacent to pin to minimize noise and EMI. |
| SW (4) | Switch Collector Node | 65V NPN collector output; connects to inductor/diode node; trace area must be minimized to reduce radiated EMI. |
| SHDN (5) | Shutdown Control | Enables/disables converter with 1.21–1.40V active window and 40mV hysteresis; supports slow-ramping enable signals. |
| RT (6) | Oscillator Timing | Resistor-to-ground sets free-running frequency (200kHz–1.5MHz); also accepts external SYNC clock signal. |
| SS (7) | Soft-Start Capacitor | Charged by 280kΩ internal current source to ~2.1V; external capacitor (100nF–1µF) controls output voltage ramp time. |
| SYNC (8) | External Clock Input | Accepts TTL/CMOS clock (1.3V high, 0.4V low); overrides internal oscillator to synchronize multiple converters and reduce beat frequencies. |
| GND (9, Exposed Pad) | Power Ground | Primary thermal and electrical return path; must be soldered to large PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Mode Feedback Architecture | Single FBX pin supports both noninverting (1.204V ref) and inverting (3mV ref) configurations-enabling one IC to replace two dedicated parts in multi-rail bias supplies. |
| Configurable UVLO | SHDN pin bias current (9–56 µA) allows resistor-divider-based undervoltage lockout with precise turn-on threshold and hysteresis. |
| Frequency Foldback During Start-Up | Reduces switching frequency to 1/6 nominal when FBX voltage is between 300mV–920mV-improving control at low duty cycles and preventing current runaway. |
| Low VCE(SAT) | 250mV at 0.2A ensures minimal conduction loss in high-current pulses, improving efficiency in 5V–12V boost applications. |
| Pin Compatibility | Pin-compatible with LT3580 and LT8580-enabling drop-in upgrades or design reuse across Analog Devices' 65V DC/DC portfolio. |
Applications
| TFT-LCD Bias Supply | VFD Display Power |
|---|---|
|
Use Scenario: Generating ±15V bias rails from a 5V or 12V system rail for automotive dashboard LCD modules. IC Role / Device Role / Timing Role: Configured as dual-inductor inverting converter to deliver clean, low-ripple negative output while maintaining isolation from input during shutdown. Use Value: Eliminates need for separate positive/negative regulators; 0.25A current limit matches typical LCD gate driver load requirements without overdesign. |
Use Scenario: Providing 24V–30V anode supply and –12V grid bias for vacuum fluorescent displays in industrial HMIs. IC Role / Device Role / Timing Role: Operated in SEPIC topology to maintain regulation across wide input range (e.g., 9V–36V vehicle battery) while ensuring output disconnect during fault conditions. Use Value: Inherent input-output isolation prevents backfeed during system reset; 65V switch rating accommodates load dump transients. |
| GPS Receiver LNA Supply | DSL Modem Line Driver |
|
Use Scenario: Generating low-noise 3.3V or 5V supply for GPS front-end LNAs in portable navigation devices. IC Role / Device Role / Timing Role: Used in boost configuration with ceramic input/output caps and shielded inductor to meet stringent RF noise specifications. Use Value: 200kHz–1.5MHz adjustable frequency avoids critical GPS IF bands (e.g., 1575.42MHz harmonics); soft-start prevents LNA bias disruption during cold start. |
Use Scenario: Delivering ±12V analog line driver supplies in DSL modems operating from 12V wall adapters. IC Role / Device Role / Timing Role: Dual LT8570IDD-1#TRPBF units-one in boost, one in inverting mode-generate complementary rails with synchronized switching to suppress differential noise. Use Value: SYNC pin enables inter-device clock alignment, reducing conducted EMI in telecommunication compliance testing (e.g., FCC Part 15B). |
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 | 0.5A current limit (vs. 0.25A); identical pinout, package, and feature set. | Suitable for higher-output-current boost/SEPIC designs where load exceeds 125mA continuous. | Select LT8570IDD#TRPBF only if peak switch current demand exceeds 0.25A; otherwise, LT8570IDD-1#TRPBF offers better thermal margin at lower cost. |
| LT3580EDD#TRPBF | Same 65V switch, 0.25A current limit, and DFN-8 package; lacks SYNC pin and frequency foldback. | Applicable where synchronization or enhanced start-up control is not required. | Choose LT3580EDD#TRPBF for cost-sensitive, fixed-frequency designs without EMI coordination needs; LT8570IDD-1#TRPBF adds flexibility for noise-critical systems. |
Compared with LT8570IDD#TRPBF, the LT8570IDD-1#TRPBF trades peak current capability for improved thermal headroom in compact layouts; versus LT3580EDD#TRPBF, it adds synchronization and foldback-critical for multi-rail, low-EMI industrial power systems.
Availability
LT8570IDD-1#TRPBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, GPS receiver power management, and DSL modem line drivers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8570IDD-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, Inc. (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 LT8570/LT8570-1 product line was designed for compact, high-voltage DC/DC conversion in space- and efficiency-constrained applications-specifically targeting display bias, telecom, and portable instrumentation where 65V capability and topology flexibility are essential.
FAQ
What is the maximum input voltage supported by the LT8570IDD-1#TRPBF?
The LT8570IDD-1#TRPBF supports an absolute maximum input voltage of 40V on the VIN pin, with guaranteed operation across 2.55V to 40V. This range enables direct use with 12V and 24V industrial rails, and accommodates automotive load-dump transients when combined with appropriate input protection circuitry. Exceeding 40V risks permanent damage per Absolute Maximum Ratings.
Can the LT8570IDD-1#TRPBF generate negative output voltages?
Yes, the LT8570IDD-1#TRPBF can generate negative outputs when configured in the dual-inductor inverting topology. Its FBX pin uses a 3mV internal reference in this mode, allowing single-resistor programming of negative VOUT. The datasheet Figure 2 and Applications Information section provide verified component values and layout guidance for stable –5V to –30V generation with low ripple.
How does the soft-start function work on the LT8570IDD-1#TRPBF?
The LT8570IDD-1#TRPBF implements soft-start by charging an external capacitor on the SS pin via a 280kΩ internal current source to ~2.1V. This voltage ramp controls the error amplifier's reference, gradually increasing output voltage and limiting inrush current. Typical SS capacitors range from 100nF to 1µF; a 100nF cap yields ~30ms ramp time, while 1µF extends it to ~300ms-ideal for sensitive downstream circuitry.
Is the LT8570IDD-1#TRPBF pin-compatible with other Linear Technology DC/DC converters?
Yes, the LT8570IDD-1#TRPBF is explicitly pin-compatible with the LT3580 and LT8580, sharing identical pin assignments, package footprint, and basic functionality. This enables drop-in replacement or design reuse across generations. However, features like SYNC and frequency foldback are unique to the LT8570 family and may remain unused in legacy LT3580 designs.
What thermal considerations apply to the LT8570IDD-1#TRPBF in the DFN package?
The LT8570IDD-1#TRPBF in the 3mm × 3mm DFN package has θJA = 43°C/W. To maintain safe junction temperature (<125°C), the exposed GND pad (Pin 9) must be soldered to a minimum 100mm² copper pour with ≥4 thermal vias to inner ground planes. At 0.25A load and 12V input → 24V output boost, typical power dissipation is ~350mW-requiring ≤50°C ambient rise for reliable operation.
LT8570IDD-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)
LT8570IDD-1#TRPBF FAQ
1.How can I place an order for LT8570IDD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8570IDD-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 LT8570IDD-1#TRPBF reliable?
The price and inventory of LT8570IDD-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 LT8570IDD-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8570IDD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8570IDD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8570IDD-1#TRPBF?
LT8570IDD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8570IDD-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 LT8570IDD-1#TRPBF?
For technical support, including LT8570IDD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8570IDD-1#TRPBF requirements.
6.How does Aetrix verify that LT8570IDD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8570IDD-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 LT8570IDD-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8570IDD-1#TRPBF?
All LT8570IDD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8570IDD-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 LT8570IDD-1#TRPBF part is unused and in its original packaging.
Return procedure for LT8570IDD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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