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Analog Devices Inc. LT8570IDD-1#PBF
- Part No.:
- LT8570IDD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8570IDD-1#PBF.pdf
- Description:
- IC REG BST CHARGE PUMP ADJ 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:655
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Product details
Overview
LT8570IDD-1#PBF from Analog Devices (formerly Linear Technology) is a 65V, 0.25A 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 voltage for TFT-LCD panels in industrial display systems.
For engineers reviewing the LT8570IDD-1#PBF datasheet, LT8570IDD-1#PBF pinout, LT8570IDD-1#PBF application, or LT8570IDD-1#PBF equivalent, key selection criteria include its 0.25A current limit, 2.55V–40V input range, 65V switch rating, thermal shutdown protection, and compatibility with compact 3mm × 3mm DFN packaging for space-constrained power designs.
Technical Context
The LT8570IDD-1#PBF employs constant-frequency current-mode control with internal slope compensation to ensure stability at duty cycles >50%. Its dual-feedback architecture supports both positive (1.204V reference) and negative (3mV reference) output configurations via a single FBX pin.
It integrates a 65V NPN power switch with 250mV VCE(SAT) at 0.2A, frequency foldback during startup, and SHDN pin with 40mV hysteresis and programmable UVLO. The RT pin sets oscillator frequency via external resistor; SYNC pin accepts 1.3V–5.5V clock signals with 35%–65% duty cycle tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Rating | 65V collector-emitter breakdown - enables direct interface with 48V industrial rails or photovoltaic inputs without external HV FETs |
| Current Limit | 0.25A typical - defines maximum peak switch current; limits inductor size and thermal stress in low-power bias supplies |
| Input Voltage Range | 2.55V to 40V - supports wide-input applications including automotive cold-crank (≥2.55V) and telecom intermediate bus (≤40V) |
| Switching Frequency | 200kHz to 1.5MHz - adjustable via RT pin; higher frequencies allow smaller magnetics but increase switching losses |
| Feedback Reference | 1.204V (noninverting) or 3mV (inverting) - enables precise output regulation across boost, SEPIC, and inverting topologies using one resistor |
| Quiescent Current | 1.2–1.7mA active, ≤1µA shutdown - minimizes standby power loss in always-on display bias circuits |
| Operating Temp | –40°C to +125°C junction - qualified for industrial temperature grade (I-grade), suitable for extended-life embedded displays |
Pinout & Package
LT8570IDD-1#PBF is housed in an 8-lead 3mm × 3mm plastic DFN package with exposed GND pad (Pin 9) requiring PCB soldering 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 (boost/SEPIC) or 3mV (inverting) reference; determines output voltage via single RFBX resistor |
| VC (2) | Error amplifier output | Connects external RC compensation network; controls loop stability and transient response |
| VIN (3) | Main input supply | 2.55V–40V input rail; requires local ceramic bypassing to minimize high-frequency noise injection |
| SW (4) | Switch collector node | Drives external inductor/diode; high di/dt path - must be routed with minimal trace area to reduce EMI |
| SHDN (5) | Enable/disable control | Active-high logic with 1.21V–1.40V threshold window; supports slow-ramping enable signals and programmable UVLO |
| RT (6) | Oscillator timing input | Resistor-to-ground sets free-running frequency; also accepts external SYNC clock when driven <0.4V |
| SS (7) | Soft-start capacitor node | Charged by internal 280kΩ current source to ~2.1V; controls ramp rate of output voltage during startup |
| SYNC (8) | External clock input | Accepts 1.3V–5.5V square wave; synchronizes switching to system clock to eliminate beat frequencies |
Key Features
| Feature | Design Value |
|---|---|
| Easily reconfigurable topology | Single IC supports boost, SEPIC, and inverting converters via external component rearrangement - reduces BOM count and design iteration time |
| Integrated soft-start | Internal 280kΩ current source charges external SS capacitor - eliminates inrush current and prevents output overshoot during power-up |
| Programmable UVLO | SHDN pin accepts resistor divider from VIN - enables custom input voltage turn-on threshold without external comparators |
| Frequency foldback | Reduces fSW to 1/6 nominal when FBX is between 300mV–920mV - improves controllability during light-load or startup conditions |
| Thermal shutdown | Activates at ~165°C junction temperature; auto-restarts after cooldown to ~160°C - protects against sustained overload or poor heatsinking |
Applications
| TFT-LCD Bias Supply | VFD Display Power |
|---|---|
Use Scenario: Generating ±15V bias rails from a 5V or 12V system supply for active-matrix LCD panels in industrial HMIs. IC Role / Device Role / Timing Role: Configured as dual-inductor inverting converter to deliver low-ripple negative output while maintaining tight regulation on both rails. Use Value: Eliminates need for discrete charge-pump or transformer-based solutions; achieves <1% output voltage drift over –40°C to +85°C ambient. |
Use Scenario: Providing regulated 30V anode supply and –10V grid bias for vacuum fluorescent displays in automotive instrument clusters. IC Role / Device Role / Timing Role: Operated in boost configuration with external Schottky diode and low-ESR ceramic output capacitor. Use Value: Delivers 120mA continuous output with <50mVpp ripple at 1MHz switching - meets EMI requirements for automotive EMC testing (CISPR 25 Class 3). |
| GPS Receiver Local Supply | DSL Modem Line Card Bias |
Use Scenario: Generating clean 3.3V LDO input rail from noisy 5V USB or PoE-derived input in portable GPS modules. IC Role / Device Role / Timing Role: Used in SEPIC topology to maintain regulation during input dips below 3.3V (e.g., battery sag) while providing inherent input-output isolation. Use Value: Enables uninterrupted GPS lock during brownout events; 65V switch withstands load-dump transients up to 40V without derating. |
Use Scenario: Producing isolated ±12V bias for line driver amplifiers in DSL modem analog front-end (AFE) sections. IC Role / Device Role / Timing Role: Implemented as inverting converter with coupled inductors to minimize magnetic footprint and cross-regulation between rails. Use Value: Achieves <±0.5% cross-regulation between ±12V outputs under dynamic load steps - critical for minimizing harmonic distortion in ADSL2+ transmission. |
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#PBF | 0.5A current limit vs. 0.25A; identical pinout, package, and feature set | Suitable for higher-output-current bias rails (e.g., >100mA); requires larger inductor and thermal margin | Select when load current exceeds 80mA and board layout allows increased copper area for thermal dissipation |
| LT3580EDD#PBF | Same 65V switch, 0.5A limit, but fixed 1.2MHz fSW; no SYNC or frequency foldback | Lacks programmable UVLO and soft-start control; simpler for fixed-frequency, cost-sensitive designs | Choose when synchronization and startup sequencing are not required and higher current headroom is needed |
Compared with LT8570IDD#PBF, the LT8570IDD-1#PBF trades current capability for lower quiescent current and reduced thermal load in low-power bias applications; versus LT3580EDD#PBF, it adds flexibility in frequency control and startup behavior at the cost of slightly higher design complexity.
Availability
LT8570IDD-1#PBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, VFD display power, GPS receiver local supplies, and DSL modem line card bias requiring stable component supply across industrial temperature ranges.
Supply support for LT8570IDD-1#PBF 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, documentation, and manufacturing continuity for all Linear-branded power ICs.
The LT8570 family was designed specifically for compact, high-voltage DC/DC bias conversion in space-constrained display and communication equipment - emphasizing topology flexibility, thermal robustness, and ease of loop compensation.
FAQ
What topology configurations does the LT8570IDD-1#PBF support?
The LT8570IDD-1#PBF supports three distinct DC/DC topologies: boost, SEPIC, and inverting - selected solely by external component arrangement. Its dual-reference FBX pin (1.204V for noninverting, 3mV for inverting) enables seamless reconfiguration without changing the LT8570IDD-1#PBF itself or its compensation network.
How is the switching frequency set on the LT8570IDD-1#PBF?
The LT8570IDD-1#PBF switching frequency is set either by connecting a resistor from the RT pin to ground (free-running mode, 200kHz–1.5MHz) or by applying an external clock signal to the SYNC pin (synchronized mode). In free-running mode, RT = 56.2kΩ yields 1.5MHz; RT = 422kΩ yields 200kHz. The SYNC pin accepts 1.3V–5.5V logic-level clocks with 35%–65% duty cycle.
What is the purpose of the SHDN pin's hysteresis on the LT8570IDD-1#PBF?
The SHDN pin on the LT8570IDD-1#PBF has 40mV hysteresis (1.21V rising, 1.27V falling) to prevent oscillation during slowly varying enable signals or near-threshold conditions. This allows direct connection to microcontroller GPIOs or resistor dividers for programmable undervoltage lockout without external hysteresis circuitry - a key design simplification in the LT8570IDD-1#PBF.
Can the LT8570IDD-1#PBF be used in SEPIC topology with input voltage equal to output voltage?
Yes - the SEPIC topology supported by the LT8570IDD-1#PBF inherently allows VIN = VOUT, VIN > VOUT, or VIN < VOUT. Its constant-frequency current-mode control and internal slope compensation ensure stable operation across this full range. The LT8570IDD-1#PBF's 65V switch rating and 0.25A current limit make it well-suited for such bidirectional voltage conversion in display bias rails where input and output voltages may closely track.
What is the minimum recommended output capacitor for the LT8570IDD-1#PBF in inverting configuration?
For inverting configurations, the LT8570IDD-1#PBF datasheet recommends a minimum 0.1µF ceramic output capacitor (X5R/X7R dielectric), scalable up to 2.2µF depending on ripple requirements. Low-ESR multilayer ceramics are mandatory to maintain loop stability and achieve <50mVpp ripple; solid tantalum alternatives are discouraged due to higher ESR and potential instability.
LT8570IDD-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT8570IDD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8570IDD-1#PBF 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#PBF reliable?
The price and inventory of LT8570IDD-1#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LT8570IDD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8570IDD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8570IDD-1#PBF?
LT8570IDD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8570IDD-1#PBF 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#PBF?
For technical support, including LT8570IDD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8570IDD-1#PBF requirements.
6.How does Aetrix verify that LT8570IDD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT8570IDD-1#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT8570IDD-1#PBF?
All LT8570IDD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8570IDD-1#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT8570IDD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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