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Analog Devices Inc. LT8570EMS8E#PBF
- Part No.:
- LT8570EMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8570EMS8E#PBF.pdf
- Description:
- IC REG BOOST CUK ADJ 750MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,925
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Product details
Overview
LT8570EMS8E#PBF from Analog Devices (formerly Linear Technology) is a 65V, 0.5A monolithic PWM DC/DC converter IC optimized for boost, SEPIC, and inverting topologies in space-constrained bias supply applications. It integrates a high-voltage NPN switch, adjustable oscillator (200kHz–1.5MHz), soft-start, synchronization input, and programmable UVLO. Key confirmed specs: 2.55V–40V input range, 1.204V positive FB reference, 250mV VCE(SAT) at 0.4A, and operation up to 125°C junction temperature.
For engineers reviewing the LT8570EMS8E#PBF datasheet, LT8570EMS8E#PBF pinout, LT8570EMS8E#PBF application, or LT8570EMS8E#PBF equivalent, this page delivers verified topology flexibility (boost/SEPIC/inverting), thermal performance data (θJA = 35–40°C/W), real-world efficiency curves, and precise feedback resistor calculation guidance per configuration.
Technical Context
The LT8570EMS8E#PBF employs constant-frequency current-mode control with internal slope compensation to ensure stability across duty cycles up to 85% (at 200kHz) and prevent subharmonic oscillation above 50%. Its dual-amplifier FBX architecture supports both noninverting (1.204V reference) and inverting (3mV reference) configurations via external resistor selection-enabling seamless topology reconfiguration without changing the IC.
Startup sequencing is managed by integrated soft-start (280kΩ internal charging current into SS pin), frequency foldback during low-FBX conditions (1/6 nominal fOSC), and precision SHDN threshold (1.21V–1.40V hysteresis) with slow-signal tolerance. The 8-lead MSOP package features an exposed GND pad for thermal dissipation and EMI reduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.55V to 40V - supports wide industrial input rails including 3.3V, 5V, 12V, 24V, and 36V systems without pre-regulation. |
| Switch Rating | 65V / 0.5A - enables 12V→24V boost, 5V→±15V inverting, or 12V→48V SEPIC with margin against transients. |
| Feedback Reference | 1.204V (positive) or 3mV (negative) - allows single-resistor output setting for both polarity configurations. |
| Switching Frequency | 200kHz to 1.5MHz (adjustable via RT pin or external SYNC) - balances efficiency vs. size: 500kHz typical for compact 2.2µH inductors. |
| VCE(SAT) | 250mV at 0.4A - reduces conduction loss to ~100mW at full switch current, critical for high-efficiency bias supplies. |
| Quiescent Current | 1.2–1.7mA active / <1µA shutdown - enables always-on monitoring circuits with minimal standby drain. |
| UVLO Threshold | User-configurable via SHDN pin divider - sets precise turn-on voltage (e.g., 8.2V min for 12V system brownout protection). |
Pinout & Package
LT8570EMS8E#PBF uses the 8-lead plastic MSOP package (MS8E) with exposed GND pad (Pin 9), θJA = 35–40°C/W. The exposed pad must be soldered to PCB ground plane for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (1) | Positive/Negative Feedback Input | Accepts 1.204V reference for boost/SEPIC or 3mV for inverting; sets VOUT via single RFBX = |VOUT − VFBX| / 83.3µA. |
| VC (2) | Error Amplifier Output | Connects to RC network (5k–50kΩ + 470pF–2.2nF) for loop compensation; drives external compensation components. |
| VIN (3) | Main Power Input | Supplies internal circuitry and switch driver; requires local 0.22–1µF ceramic bypass capacitor. |
| SW (4) | Switch Collector Node | High-voltage (65V) NPN collector; connects to inductor/diode; trace minimization critical for EMI control. |
| SHDN (5) | Shutdown Control Input | Enables/disables IC with 1.21V–1.40V hysteresis; accepts slow-ramping signals for sequenced power-up. |
| RT (6) | Oscillator Timing Input | Resistor-to-ground sets free-running frequency (e.g., 56.2kΩ = 1.5MHz); open-circuit disables oscillator. |
| SS (7) | Soft-Start Capacitor Terminal | Charged by 280kΩ internal current source to ~2.1V; 100nF–1µF cap controls ramp time and inrush limiting. |
| SYNC (8) | External Clock Input | Accepts 0.4V–1.3V logic-level clock (35–65% duty); overrides RT setting for EMI reduction or multi-rail synchronization. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-Topology Flexibility | Single IC supports boost (VOUT > VIN), SEPIC (VOUT >, =, or < VIN), and inverting (VOUT < 0) via external component reconfiguration - eliminates BOM duplication. |
| Programmable UVLO | SHDN pin accepts resistor divider to set precise turn-on voltage (e.g., 9.1V for automotive cold-crank immunity), independent of input rail. |
| Frequency Foldback | Reduces switching frequency to 1/6 nominal during startup (FBX = 300–920mV) - lowers minimum on-time requirement and improves current control at light loads. |
| Thermally Enhanced MSOP | 8-lead MSOP with exposed GND pad achieves θJA = 35°C/W - enables 1.5W continuous power delivery without heatsink in 4-layer PCB designs. |
| Slow-Signal SHDN Interface | High-gain SHDN input tolerates <100mV/ms ramp rates - simplifies integration with microcontroller GPIO or analog supervisor outputs without Schmitt triggers. |
Applications
| VFD Bias Supply | TFT-LCD Bias Supply |
|---|---|
|
Use Scenario: Generating ±15V to ±30V rails for vacuum fluorescent display segment drivers in industrial HMIs. IC Role / Device Role / Timing Role: LT8570EMS8E#PBF operates in inverting topology to produce negative bias; synchronized to system clock to suppress beat frequencies. Use Value: Single-chip solution replaces dual discrete converters, reducing board area by 40% and eliminating cross-regulation issues between positive/negative rails. |
Use Scenario: Providing AVDD (12–18V) and VGL (−7V) for TFT-LCD gate drivers in medical imaging panels. IC Role / Device Role / Timing Role: LT8570EMS8E#PBF configured as SEPIC for AVDD (input 5V → output 15V), and inverting for VGL (input 5V → output −7V). Use Value: Shared feedback architecture ensures tight tracking (<±2%) between complementary rails, critical for display contrast consistency. |
| GPS Receiver Power | DSL Modem Local Supply |
|
Use Scenario: Generating clean 3.3V LNA supply from noisy 5V USB power in portable GPS modules. IC Role / Device Role / Timing Role: LT8570EMS8E#PBF used in boost mode with 500kHz switching; SS pin controlled by GPS baseband IC for sequenced enable. Use Value: Integrated soft-start and low-noise design achieve <10mVpp ripple, preventing RF front-end desensitization. |
Use Scenario: Creating isolated ±12V bias for DSL line drivers in residential gateways operating from 12V wall adapter. IC Role / Device Role / Timing Role: LT8570EMS8E#PBF configured as dual inverting converter with coupled inductors to minimize EMI in dense Ethernet/DSL co-location. Use Value: Synchronization capability aligns switching edges with Ethernet PHY clock, reducing conducted emissions by 12dB in 30–100MHz band. |
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 + three bucks/boosts; no inverting/SEPIC support; higher quiescent current (25µA) | Targeted at multi-rail SoC power (e.g., application processors), not single-rail bias generation | Select when multiple regulated outputs are required and topology flexibility is secondary to integration. |
| LT8330EDD#PBF | 60V, 1.5A synchronous boost/SEPIC/inverting; integrated MOSFETs; 2.7V–40V input; no SYNC pin | Higher current capability but larger DFN package (10-lead 3×4mm); lacks external clock sync for EMI-sensitive designs | Select when >0.5A load current is needed and synchronization is not required for noise management. |
Compared with LTC3589EUF#PBF and LT8330EDD#PBF, the LT8570EMS8E#PBF offers unique topology reconfigurability in a thermally optimized MSOP package with precise synchronization and UVLO control-making it optimal for compact, noise-sensitive bias supplies where single-rail flexibility outweighs multi-output integration or raw current capacity.
Availability
LT8570EMS8E#PBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, GPS receiver power, and DSL modem local supplies requiring stable component supply across industrial temperature ranges (–40°C to 125°C).
Supply support for LT8570EMS8E#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8570EMS8E#PBF belongs to Linear's legacy high-voltage DC/DC converter product line, designed specifically for compact, efficient bias supplies in display, sensing, and communication infrastructure where topology flexibility and thermal robustness are critical.
FAQ
What topology configurations does the LT8570EMS8E#PBF support?
The LT8570EMS8E#PBF supports three distinct DC/DC topologies: boost (step-up), SEPIC (step-up/step-down with isolation), and inverting (negative output). Configuration is determined solely by external component connections-no change to the LT8570EMS8E#PBF itself is required. The FBX pin's dual-reference architecture (1.204V for noninverting, 3mV for inverting) enables seamless reconfiguration using a single feedback resistor.
How is the output voltage set for the LT8570EMS8E#PBF in boost versus inverting mode?
In boost or SEPIC mode, the LT8570EMS8E#PBF uses its 1.204V positive feedback reference; RFBX = (VOUT − 1.204V) / 83.3µA. In inverting mode, it uses the 3mV negative reference; RFBX = (VOUT + 0.003V) / 83.3µA. This direct relationship means the same LT8570EMS8E#PBF can generate +12V or −12V using identical component counts-only the resistor value and diode orientation change.
What is the purpose of the SYNC pin on the LT8570EMS8E#PBF?
The SYNC pin on the LT8570EMS8E#PBF allows external clock synchronization to reduce electromagnetic interference (EMI) by aligning switching edges with system clocks or other converters. It accepts logic-level inputs (0.4V–1.3V) with 35–65% duty cycle and supports fSYNC/fOSC ≥ 3/4. When driven below 0.4V, the LT8570EMS8E#PBF reverts to its internal RT-set oscillator-providing design flexibility without hardware changes.
Can the LT8570EMS8E#PBF operate with input voltages below 3V?
Yes-the LT8570EMS8E#PBF has a guaranteed minimum input voltage of 2.55V, enabling reliable operation from single-cell Li-ion (2.7–4.2V), 3.3V logic rails, or partially discharged batteries. At 2.55V input, it maintains regulation across its full 0.5A switch current limit and 200kHz–1.5MHz frequency range, making it suitable for battery-powered instrumentation and portable GPS receivers.
How does the LT8570EMS8E#PBF handle thermal overload?
The LT8570EMS8E#PBF incorporates thermal shutdown that activates at ~165°C junction temperature, forcing a complete restart of the soft-start sequence upon cooldown to ~160°C. Unlike simple current limiting, this protects both the internal NPN switch and external magnetics. The MSOP package's exposed GND pad (θJA = 35–40°C/W) ensures predictable thermal behavior-allowing derating curves to be applied directly from the datasheet's thermal performance graphs.
LT8570EMS8E#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LT8570EMS8E#PBF FAQ
1.How can I place an order for LT8570EMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8570EMS8E#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 LT8570EMS8E#PBF reliable?
The price and inventory of LT8570EMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8570EMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LT8570EMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8570EMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8570EMS8E#PBF?
LT8570EMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8570EMS8E#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 LT8570EMS8E#PBF?
For technical support, including LT8570EMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8570EMS8E#PBF requirements.
6.How does Aetrix verify that LT8570EMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LT8570EMS8E#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 LT8570EMS8E#PBF meets industry standards.
7.What is the process for return or replacement of LT8570EMS8E#PBF?
All LT8570EMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8570EMS8E#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 LT8570EMS8E#PBF part is unused and in its original packaging.
Return procedure for LT8570EMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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