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Analog Devices Inc. LT8570HDD#PBF
- Part No.:
- LT8570HDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8570HDD#PBF.pdf
- Description:
- IC REG BOOST CUK ADJ 500MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,082
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Product details
Overview
LT8570HDD#PBF 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. Designed for high-reliability bias supplies in TFT-LCD and VFD displays operating across –40°C to 150°C junction temperature.
For engineers reviewing the LT8570HDD#PBF datasheet, LT8570HDD#PBF pinout, LT8570HDD#PBF application, or LT8570HDD#PBF equivalent, key selection considerations include its 65V switch rating, 0.5A current limit, thermal grade (H-grade), DFN-8 (3mm × 3mm) package with exposed pad, and compatibility with boost/SEPIC/inverting configurations requiring stable high-voltage bias generation.
Technical Context
The LT8570HDD#PBF 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 power switch with thermal shutdown (~165°C) and precise SHDN pin thresholds (1.21V–1.40V) enabling programmable UVLO via external resistor divider. The RT pin sets oscillator frequency via external resistor; SYNC pin accepts external clock signals (1.3V high, <0.4V low).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Voltage Rating | 65V - supports input-to-output voltage differentials up to 65V, enabling use in 40V-input systems generating 12V, ±15V, or higher outputs. |
| Switch Current Limit | 0.5A (typical at 50% duty cycle) - defines maximum peak inductor current; limits stress on external components and enables predictable power stage sizing. |
| Input Voltage Range | 2.55V to 40V - accommodates wide industrial input rails including 3.3V, 5V, 12V, 24V, and 36V battery or bus supplies. |
| Switching Frequency Range | 200kHz to 1.5MHz - allows optimization of size vs. efficiency: higher frequencies enable smaller inductors/capacitors; lower frequencies improve light-load efficiency. |
| Junction Temperature Range | –40°C to +150°C (H-grade) - qualified for under-hood automotive, industrial motor drives, and high-ambient lighting applications where extended thermal margin is critical. |
| Feedback Reference Voltage | 1.204V (noninverting) or 3mV (inverting) - enables precise output regulation with single-resistor feedback network; eliminates need for external reference or divider scaling. |
| Soft-Start Charging Current | 6µA (typical) - determines ramp rate of SS pin voltage when paired with external capacitor; provides controlled inrush current limiting during startup. |
Pinout & Package
LT8570HDD#PBF is housed in an 8-lead, 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 9 = GND). The thermally enhanced construction delivers θJA = 43°C/W and requires soldering of the exposed pad to PCB ground plane for reliable thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (Pin 1) | Positive/Negative Feedback Input | Configures topology: pulled to 1.204V for boost/SEPIC (noninverting), or to 3mV for inverting; sets output voltage via single resistor RFBX. |
| VC (Pin 2) | Error Amplifier Output | Connects external RC compensation network; directly controls PWM comparator threshold to stabilize voltage loop. |
| VIN (Pin 3) | Main Input Supply | Accepts 2.55V–40V input; must be locally bypassed with low-ESR ceramic capacitor placed adjacent to pin. |
| SW (Pin 4) | Switch Collector Node | Drives external inductor/diode; high di/dt node - minimize trace area to reduce EMI and parasitic inductance. |
| SHDN (Pin 5) | Enable/Shutdown Control | High-threshold (1.40V) activation with 40mV hysteresis; accepts slow-rising inputs; enables programmable UVLO using resistor divider from VIN. |
| RT (Pin 6) | Oscillator Timing Input | Resistor-to-ground sets free-running frequency; supports synchronization when driven externally via SYNC pin. |
| SS (Pin 7) | Soft-Start Control | Charged by internal 280kΩ current source to ~2.1V; external capacitor sets startup time and inrush current profile. |
| SYNC (Pin 8) | External Clock Input | Accepts TTL/CMOS-compatible clock (1.3V high, <0.4V low); overrides internal oscillator; enables system-level clock domain alignment. |
| GND (Pin 9, Exposed Pad) | Power & Signal Ground | Thermal and electrical ground reference; must be soldered to large PCB copper area for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-Topology Flexibility | Single IC supports boost, SEPIC, and inverting configurations via external component reconnection - reduces BOM count and design reuse effort. |
| 65V Integrated NPN Switch | Eliminates need for external high-voltage switch; simplifies layout and improves reliability in high-input-voltage bias supplies. |
| H-Temperature Grade (–40°C to +150°C) | Guaranteed operation over full junction range - suitable for under-hood, industrial control, and high-ambient lighting without derating. |
| Synchronizable Switching Frequency | Enables noise-sensitive system integration (e.g., GPS receivers, audio subsystems) by aligning switching harmonics to fixed clock domains. |
| Programmable Undervoltage Lockout | SHDN pin accepts resistor divider from VIN - allows precise turn-on threshold setting independent of internal reference. |
| Integrated Soft-Start with Foldback | Prevents output overshoot and inrush stress; frequency foldback during startup improves controllability at low FBX voltages. |
Applications
| TFT-LCD Bias Supply | VFD Display Bias Supply |
|---|---|
Use Scenario: Generating ±15V, +20V, or +30V bias rails from a 5V or 12V main supply in automotive or industrial LCD panels. IC Role / Device Role / Timing Role: Configured as inverting or SEPIC converter to produce isolated high-voltage rails with tight regulation and low ripple. Use Value: Enables single-chip solution for dual-polarity bias generation; 65V switch rating supports >25V output swing without external components. |
Use Scenario: Powering vacuum fluorescent display segments requiring 20V–40V anode drive from low-voltage microcontroller rails. IC Role / Device Role / Timing Role: Operated as boost converter with adjustable frequency to avoid audible noise in display driver circuits. Use Value: H-grade thermal rating ensures stable operation in sealed enclosures; soft-start prevents filament surge current damage during cold start. |
| GPS Receiver Local Supply | DSL Modem Line Driver Bias |
Use Scenario: Providing clean, low-noise 3.3V or 5V local supply for GPS RF front-end and baseband ICs in portable navigation devices. IC Role / Device Role / Timing Role: Synchronized to system clock to shift switching noise away from L1 (1.575GHz) and L2 bands. Use Value: SYNC pin compatibility enables EMI mitigation without added filtering; small DFN package saves space in compact handheld modules. |
Use Scenario: Generating +12V and –12V line driver supplies in DSL modems operating from 12V or 24V wall adapters. IC Role / Device Role / Timing Role: Used in dual inductor inverting configuration to deliver low-ripple negative rail with inherent output disconnect. Use Value: SEPIC topology provides input-output isolation during shutdown - prevents backfeed into upstream power stages during fault conditions. |
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-switch buck-boost with I2C interface; 60V max input; 1.2A switch; integrated LDOs | Requires digital configuration; supports dynamic voltage scaling; not pin-compatible | Select for programmable multi-rail systems needing sequencing and telemetry - not for simple fixed-bias replacement. |
| LT8330EDD#PBF | 60V, 1.5A monolithic boost/SEPIC/inverting converter; 200kHz–2.5MHz range; higher current, same package | Higher peak current and frequency ceiling; identical topology support and pinout | Drop-in upgrade path when 0.5A limit is insufficient; shares same DFN-8 footprint and feedback architecture. |
Compared with LT8570HDD#PBF, LTC3589EUF#PBF adds digital control but increases complexity and cost, while LT8330EDD#PBF offers higher current headroom with identical mechanical and functional compatibility - making it the preferred alternative for power-scaling scenarios.
Availability
LT8570HDD#PBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, VFD display drivers, and GPS receiver local power generation requiring stable component supply across extended temperature ranges.
Supply support for LT8570HDD#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 the LT® portfolio.
The LT8570 series was designed specifically for high-voltage, multi-topology DC/DC bias conversion in space-constrained, thermally demanding applications such as display electronics and communications infrastructure.
FAQ
What is the maximum output voltage achievable with LT8570HDD#PBF in boost configuration?
The LT8570HDD#PBF does not impose a hard limit on output voltage beyond its 65V switch rating and practical component constraints. In boost mode, VOUT is limited by the breakdown voltage of external diode and output capacitor, and by duty cycle constraints (max ~75% at 1.5MHz). With proper component selection, outputs up to 60V are achievable while maintaining safe margin below the 65V SW pin rating. Always verify VSW = VOUT + VF − VCE(SAT) remains ≤65V in your LT8570HDD#PBF design.
Can LT8570HDD#PBF be used in SEPIC topology with coupled inductors?
Yes, LT8570HDD#PBF supports SEPIC operation with either coupled or uncoupled inductors. When using coupled inductors, correct phasing must be observed per Figure 1 in the datasheet to ensure proper magnetic coupling and ripple cancellation. Coupled inductors reduce board area and can improve efficiency at light loads, but require careful winding polarity verification. The LT8570HDD#PBF's current-mode control and slope compensation ensure stable operation regardless of inductor type.
How is undervoltage lockout (UVLO) configured on LT8570HDD#PBF?
UVLO on LT8570HDD#PBF is implemented via the SHDN pin: connect a resistor divider from VIN to GND, with the midpoint tied to SHDN. The part activates when SHDN voltage exceeds 1.40V (typical) and deactivates below 1.21V (typical), providing 40mV hysteresis. For example, with VIN = 24V, use R1 = 1.21MΩ from VIN to SHDN and R2 = 100kΩ from SHDN to GND to set turn-on at ~24V and turn-off at ~22.2V. This method allows precise, temperature-stable UVLO thresholds without external comparators.
What is the purpose of the FBX pin's dual-reference architecture in LT8570HDD#PBF?
The FBX pin in LT8570HDD#PBF provides two internal reference points - 1.204V for noninverting topologies (boost/SEPIC) and 3mV for inverting topologies - enabling topology reconfiguration without changing the IC. When RFBX connects VOUT to FBX, the amplifier selection is automatic: positive feedback engages A1 for boost/SEPIC; negative feedback engages A2 for inverting. This eliminates external op-amps or level-shifters and ensures accurate regulation across all supported configurations using a single feedback resistor.
Does LT8570HDD#PBF require external compensation components?
Yes, LT8570HDD#PBF requires external compensation on the VC pin: a series RC network (e.g., 10kΩ + 1nF) in parallel with a small capacitor (e.g., 47pF) from VC to GND. This network stabilizes the voltage loop by controlling phase/gain margins. Compensation values depend on topology, output voltage, and load; typical starting points are RC = 10kΩ, CSERIES = 1nF, CPARALLEL = 47pF. Evaluation with load transients is recommended - the LT8570HDD#PBF datasheet provides detailed methodology and Bode plot guidance.
LT8570HDD#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, 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:
- 500mA (Switch)
- Frequency - Switching:
- 200kHz ~ 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT8570HDD#PBF FAQ
1.How can I place an order for LT8570HDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8570HDD#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 LT8570HDD#PBF reliable?
The price and inventory of LT8570HDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8570HDD#PBF is usually 5 days.
3.What payment methods are accepted for LT8570HDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8570HDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8570HDD#PBF?
LT8570HDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8570HDD#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 LT8570HDD#PBF?
For technical support, including LT8570HDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8570HDD#PBF requirements.
6.How does Aetrix verify that LT8570HDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT8570HDD#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 LT8570HDD#PBF meets industry standards.
7.What is the process for return or replacement of LT8570HDD#PBF?
All LT8570HDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8570HDD#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 LT8570HDD#PBF part is unused and in its original packaging.
Return procedure for LT8570HDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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