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Analog Devices Inc. LT8570IDD#PBF
- Part No.:
- LT8570IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8570IDD#PBF.pdf
- Description:
- IC REG BOOST CUK ADJ 750MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:502
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Product details
Overview
LT8570IDD#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 an 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#PBF datasheet, LT8570IDD#PBF pinout, LT8570IDD#PBF application, or LT8570IDD#PBF equivalent, key selection considerations include its 65V switch rating, 0.5A current limit, 2.55V–40V input range, thermally enhanced 3mm × 3mm DFN package, and dual-mode feedback architecture enabling both positive and negative output configurations.
Technical Context
The LT8570IDD#PBF employs constant-frequency current-mode control with internal slope compensation to ensure stability at duty cycles >50%. Its dual-path error amplifier (A1/A2) dynamically selects between 1.204V reference for noninverting modes and 3mV reference for inverting modes based on FBX pin bias polarity.
It integrates frequency foldback during startup (reducing fOSC to 1/6 nominal), a high-gain SHDN pin accepting slow-ramping enable signals, and a 280kΩ internal soft-start charging resistor. The 0.04Ω typical VCE(SAT) switch enables high efficiency in compact 3mm × 3mm DFN layouts with exposed thermal pad soldered to PCB ground.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Rating | 65V collector-emitter breakdown - supports input-to-output differential up to 65V in inverting/SEPIC, enabling wide VIN–VOUT span applications. |
| Switch Current Limit | 0.5A (typical at 50% duty cycle) - sets maximum peak inductor current, constraining output power in boost/SEPIC/inverting designs. |
| Input Voltage Range | 2.55V to 40V - accommodates 3.3V, 5V, 12V, 24V, and 36V industrial rails with margin for transients and ripple. |
| Switching Frequency | 200kHz to 1.5MHz (adjustable via RT resistor or external SYNC clock) - balances EMI, inductor size, and efficiency across operating conditions. |
| Feedback Reference | 1.204V (noninverting) or 3mV (inverting) - enables single-resistor VOUT programming for both positive and negative outputs without external op-amps. |
| Soft-Start Time | Controlled by external SS capacitor charged at ~280kΩ rate to ~2.1V - prevents inrush current and ensures monotonic VOUT ramp in bias supply applications. |
| UVLO Threshold | User-configurable via SHDN resistor divider - allows precise turn-on voltage setting (e.g., 3.3V or 5V system rail monitoring) with 40mV hysteresis. |
Pinout & Package
LT8570IDD#PBF is housed in an 8-lead, 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 9 = GND). The package provides θJA = 43°C/W and requires soldering of the exposed pad to the PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (1) | Positive/negative feedback input | Accepts either pull-up (to VOUT) for 1.204V reference (boost/SEPIC) or pull-down (to VOUT) for 3mV reference (inverting); sets output voltage with single resistor. |
| VC (2) | Error amplifier output | Connects to RC network (RC, CC, CP) for loop compensation; drives internal PWM comparator threshold. |
| VIN (3) | Main input supply | Supplies internal circuitry and switch driver; requires local 0.47–1µF ceramic bypass capacitor placed adjacent to pin. |
| SW (4) | Internal NPN switch collector | High-slew node connecting to external inductor/diode; trace must be short and low-inductance to minimize EMI and switching losses. |
| SHDN (5) | Enable/disable control with UVLO | High-gain input accepts slow-rising signals; 1.21–1.40V transition window enables programmable undervoltage lockout with hysteresis. |
| RT (6) | Oscillator timing resistor | Resistor to GND sets free-running frequency (e.g., 56.2kΩ → 1.5MHz); open-circuit disables internal oscillator when SYNC is used. |
| SS (7) | Soft-start capacitor node | Charged by internal 280kΩ current source to ~2.1V; external capacitor (100nF–1µF) controls VOUT ramp time and inrush limiting. |
| SYNC (8) | External clock synchronization input | Accepts TTL/CMOS clock (1.3V high / 0.4V low); overrides RT setting; fSYNC/fOSC ≥ 3/4 required for reliable locking. |
| GND (9, Exposed Pad) | Power and signal ground | Thermal and electrical reference; exposed pad must be soldered to solid PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual topology support | Single IC configures as boost, SEPIC, or inverting converter via external component routing - eliminates need for multiple part numbers in multi-rail bias designs. |
| Programmable UVLO | SHDN pin bias network allows precise system-level brown-out detection (e.g., 3.0V ±50mV) without external comparators or voltage references. |
| Integrated soft-start | Internal 280kΩ charging current + external SS capacitor enables controlled output ramp - prevents overshoot and reduces stress on output capacitors in TFT-LCD VCOM/VDD supplies. |
| Frequency foldback | Automatically reduces switching frequency to 1/6 nominal when FBX voltage is between 300mV–920mV - improves current control during startup and light-load transitions. |
| Thermally enhanced DFN | 3mm × 3mm package with exposed GND pad achieves θJA = 43°C/W - supports 1W+ continuous power in space-constrained industrial display modules. |
Applications
| TFT-LCD Bias Supply | VFD Display Bias Supply |
|---|---|
|
Use Scenario: Generating ±15V and +20V bias rails from a 5V or 12V main supply for active-matrix LCD panels in industrial HMIs and medical displays. IC Role / Device Role / Timing Role: Primary DC/DC controller implementing dual inductor inverting and SEPIC topologies to deliver isolated, regulated positive and negative outputs. Use Value: Single-chip solution replaces discrete boost + inverter combinations, reducing BOM count by ≥4 components and board area by >30%. |
Use Scenario: Providing high-voltage filament and grid bias (e.g., +40V, –20V) from 3.3V or 5V logic rails in vacuum fluorescent display modules for test equipment and instrumentation. IC Role / Device Role / Timing Role: High-voltage DC/DC converter operating in boost mode with 65V switch rating to safely generate >35V outputs from low-input sources. Use Value: Enables direct derivation of VFD bias from system logic rail - eliminates need for dedicated high-voltage charge pumps or transformer-based supplies. |
| GPS Receiver Power | DSL Modem Local Supply |
|
Use Scenario: Delivering clean, low-noise 3.3V LNA supply and 2.85V RF front-end bias from a noisy 5V automotive or portable battery rail. IC Role / Device Role / Timing Role: Synchronizable DC/DC converter locked to system clock to shift switching noise away from GPS L1 band (1575.42MHz). Use Value: Reduces conducted EMI in sensitive RF sections by >15dB through deterministic frequency placement - avoids desense in GNSS receivers. |
Use Scenario: Generating isolated ±12V line driver supplies and +3.3V PHY core voltage from a 12V DSL line card input in broadband access equipment. IC Role / Device Role / Timing Role: Dual-output SEPIC controller delivering regulated positive and negative rails with inherent input-output disconnect during shutdown. Use Value: Ensures safe power sequencing and fault isolation - prevents backfeed into upstream 12V bus when line drivers are disabled or fail. |
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-output PMIC with buck, boost, LDOs; 40V switch; 0.6A limit; I2C programmable; no inverting mode. | Targets multi-rail SoC power (e.g., FPGA, DSP); lacks native inverting topology and 65V switch capability. | Choose LTC3589EUF#PBF only when digital configurability and multiple regulated outputs outweigh need for high-voltage inverting conversion. |
| LT8330EDD#PBF | 60V, 1.5A boost/SEPIC/inverting converter; higher current; 3mm × 4mm DFN; no SYNC pin; fixed 2.2MHz fSW. | Better suited for higher-power bias supplies (>500mA); lacks synchronization and adjustable frequency range. | Choose LT8330EDD#PBF when output current demand exceeds 0.5A and EMI constraints allow fixed 2.2MHz operation without clock alignment. |
Compared with LTC3589EUF#PBF and LT8330EDD#PBF, the LT8570IDD#PBF uniquely balances 65V switch rating, 0.5A current capability, full topology flexibility (boost/SEPIC/inverting), and synchronization - making it optimal for compact, high-voltage bias generation where programmability and ultra-high current are secondary to precision control and noise management.
Availability
LT8570IDD#PBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, GPS receiver power conditioning, and DSL modem local regulation requiring stable component supply across industrial temperature ranges (–40°C to 125°C).
Supply support for LT8570IDD#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 its high-performance analog and power management portfolio. Linear's legacy emphasizes precision, ruggedness, and application-specific integration for demanding industrial and communications systems.
The LT8570 series was designed specifically for compact, high-voltage bias generation in display and RF subsystems - prioritizing topology flexibility, robust input handling, and thermal efficiency in miniature DFN packages.
FAQ
What topology configurations does the LT8570IDD#PBF support?
The LT8570IDD#PBF supports three distinct DC/DC configurations: boost (step-up), SEPIC (input can be above, below, or equal to output), and inverting (negative output from positive input). Configuration is determined solely by external component connections - no internal configuration bits or mode pins are required. Each topology uses the same LT8570IDD#PBF die and leverages its dual-reference FBX pin architecture to maintain regulation accuracy across all modes.
How is the output voltage set on the LT8570IDD#PBF?
The LT8570IDD#PBF uses a single external resistor (RFBX) from VOUT to the FBX pin to set output voltage. For boost and SEPIC (noninverting) topologies, RFBX = (VOUT − 1.204V) / 83.3µA. For inverting topologies, RFBX = (VOUT + 0.003V) / 83.3µA. This resistor-based method eliminates need for voltage dividers or external references, simplifying layout and improving accuracy over temperature.
What is the purpose of the SYNC pin on the LT8570IDD#PBF?
The SYNC pin on the LT8570IDD#PBF allows external clock synchronization to suppress switching noise in noise-sensitive systems like GPS receivers or audio circuits. When driven with a clean square wave (≥1.3V high, ≤0.4V low, ≥75% duty cycle), the LT8570IDD#PBF locks its internal oscillator to the external frequency. This enables deterministic EMI placement and eliminates beat frequencies that arise from free-running oscillators.
Can the LT8570IDD#PBF operate with input voltages below 3V?
Yes, the LT8570IDD#PBF operates down to 2.55V input, making it compatible with single-cell Li-ion (2.7–4.2V), 3.3V logic rails, and partially discharged battery sources. Its internal circuitry remains functional across the full –40°C to 125°C junction temperature range at this minimum input, and the 0.5A switch current limit is maintained, enabling reliable low-VIN boost operation in portable and energy-harvesting applications.
How does the SHDN pin provide undervoltage lockout functionality?
The SHDN pin on the LT8570IDD#PBF features a high-gain comparator with precise 1.21V–1.40V activation window and 40mV hysteresis. By connecting a resistor divider from VIN to SHDN, designers set a custom UVLO threshold (e.g., 3.0V ±20mV). When input drops below the falling threshold, the LT8570IDD#PBF shuts down cleanly; upon recovery, it initiates full soft-start - preventing brown-out oscillation and ensuring robust power sequencing.
LT8570IDD#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:
- 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#PBF FAQ
1.How can I place an order for LT8570IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8570IDD#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#PBF reliable?
The price and inventory of LT8570IDD#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#PBF is usually 5 days.
3.What payment methods are accepted for LT8570IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8570IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8570IDD#PBF?
LT8570IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8570IDD#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#PBF?
For technical support, including LT8570IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8570IDD#PBF requirements.
6.How does Aetrix verify that LT8570IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT8570IDD#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#PBF meets industry standards.
7.What is the process for return or replacement of LT8570IDD#PBF?
All LT8570IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8570IDD#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#PBF part is unused and in its original packaging.
Return procedure for LT8570IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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