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Analog Devices Inc. LT8570HMS8E#PBF
- Part No.:
- LT8570HMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8570HMS8E#PBF.pdf
- Description:
- IC REG BOOST CUK ADJ 500MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:147
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Product details
Overview
LT8570HMS8E#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 2.55V–40V input range - enabling compact high-voltage bias supplies for TFT-LCD and VFD displays.
For engineers reviewing the LT8570HMS8E#PBF datasheet, LT8570HMS8E#PBF pinout, LT8570HMS8E#PBF application, or LT8570HMS8E#PBF equivalent, key selection criteria include its 0.5A switch current limit, MSOP-8 package with exposed thermal pad, UVLO programmability via SHDN pin, and compatibility with high-side NPN switch configurations requiring low VCE(SAT) (250mV @ 0.4A).
Technical Context
The LT8570HMS8E#PBF implements constant-frequency current-mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its dual-feedback architecture (FBX pin supports ±1.204V/±3mV reference modes) enables seamless reconfiguration between noninverting (boost/SEPIC) and inverting topologies without external component changes.
It integrates frequency foldback during soft-start (reducing fOSC to 1/6 nominal), a high-gain SHDN pin tolerant of slow-ramping enable signals, and thermal shutdown at ~165°C. The VC pin provides direct access to the error amplifier output for custom loop compensation using RC networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Voltage Rating | 65V - supports output voltages up to 60V in boost/SEPIC, enabling high-bias rails for display drivers. |
| Switch Current Limit | 0.5A (LT8570 variant) - sets maximum peak inductor current; determines power delivery capability in continuous conduction mode. |
| Input Voltage Range | 2.55V to 40V - accommodates wide-input industrial and automotive supply rails, including 12V/24V systems with transients. |
| Switching Frequency Range | 200kHz to 1.5MHz - adjustable via RT resistor or external SYNC clock; higher frequencies allow smaller magnetics and faster transient response. |
| VCE(SAT) @ Rated Current | 250mV @ 0.4A - low saturation voltage minimizes conduction loss and improves efficiency in high-current boost stages. |
| Operating Junction Temp | –40°C to +150°C - H-grade qualification ensures reliability in under-hood, industrial, and high-ambient environments. |
| Feedback Reference | 1.204V (noninverting) / 3mV (inverting) - dual-mode FBX pin enables single-part support for both positive and negative output configurations. |
Pinout & Package
LT8570HMS8E#PBF uses the MS8E package: 8-lead plastic MSOP with exposed thermal pad (Pin 9 = GND). Thermal resistance θJA = 35–40°C/W. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (Pin 1) | Positive/Negative Feedback Input | Accepts either 1.204V reference (boost/SEPIC) or 3mV reference (inverting); sets output voltage via single resistor RFBX. |
| VC (Pin 2) | Error Amplifier Output | Provides access to compensation node; requires external RC network to stabilize voltage loop across load/line variations. |
| VIN (Pin 3) | Main Power Input | Supplies internal circuitry and switch driver; requires local 0.22–1µF ceramic bypass capacitor near pin. |
| SW (Pin 4) | Internal NPN Switch Collector | High-voltage switching node; must be routed with minimal trace area to reduce EMI and parasitic inductance. |
| SHDN (Pin 5) | Enable/Shutdown Control | High-gain input accepts slow-rising signals; 1.21–1.40V hysteresis enables programmable UVLO using resistor divider from VIN. |
| RT (Pin 6) | Oscillator Timing Input | Resistor-to-ground sets free-running frequency; also accepts external SYNC signal when driven <0.4V (free-run) or >1.3V (sync mode). |
| SS (Pin 7) | Soft-Start Capacitor Node | Charged by internal 280kΩ current source to ~2.1V; external capacitor controls ramp rate and inrush current limiting. |
| SYNC (Pin 8) | External Clock Input | Accepts TTL/CMOS clock (35–65% duty cycle); synchronizes switching to system clock to eliminate beat frequencies. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-Topology Flexibility | Single IC supports boost, SEPIC, and inverting converters - reduces BOM count and design time for multi-rail bias generation. |
| Programmable UVLO | SHDN pin allows user-defined undervoltage lockout threshold using external resistor divider - critical for brown-out protection in 12V/24V systems. |
| Frequency Foldback During Start-Up | Reduces switching frequency to 1/6 nominal when FBX is between 300mV–920mV - improves controllability and limits inrush during soft-start. |
| Thermally Enhanced MSOP | Exposed pad in MS8E package delivers θJA ≤ 40°C/W - enables 1W+ power dissipation without heatsink in space-constrained layouts. |
| Robust Switch Protection | Integrated current limit (0.5A) and thermal shutdown (~165°C) protect both IC and external components during overload or short-circuit events. |
Applications
| TFT-LCD Bias Supply | VFD Display Driver |
|---|---|
Use Scenario: Generating +15V and –10V rails from a 5V or 12V input for LCD gate/source drivers and common electrode bias. IC Role / Device Role / Timing Role: Configured as dual-output SEPIC/inverting converter; regulates both positive and negative outputs independently using shared switch. Use Value: Eliminates need for separate boost and inverting ICs; achieves <1% output regulation over temperature and load with single feedback resistor per rail. |
Use Scenario: Providing high-impedance, low-noise –25V to –35V grid bias for vacuum fluorescent displays in industrial HMIs and instrumentation panels. IC Role / Device Role / Timing Role: Operated in inverting topology with coupled inductors; delivers low-ripple negative output with inherent output disconnect during shutdown. Use Value: Enables clean turn-off without output leakage; supports fast dimming control via SHDN pin modulation while maintaining stable bias voltage. |
| GPS Receiver Power | DSL Modem Local Supply |
Use Scenario: Deriving 3.3V LDO input rail from a noisy 5V USB or battery source in portable GPS modules with strict EMI requirements. IC Role / Device Role / Timing Role: Used in boost configuration with 1.2MHz switching; synchronized to baseband processor clock to avoid interference in RF bands. Use Value: Reduces conducted emissions by eliminating beat frequencies; maintains >85% efficiency at 100mA load with ceramic-only output filter. |
Use Scenario: Generating isolated 12V auxiliary supply for line-driver ICs in DSL modems operating from 5V or 3.3V system rails. IC Role / Device Role / Timing Role: Configured as SEPIC to handle input dips below output (e.g., 3.3V input → 12V output) while maintaining regulation during line surges. Use Value: Provides inherent input-output isolation and fault containment; withstands 40V transients on VIN without latch-up or damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3787EMSE#PBF | Higher 40V input, 10A external MOSFET drive, no integrated switch - requires external FETs and more external components. | Targeted at high-current (>2A) synchronous buck-boost designs; not suitable for low-component-count bias supplies. | Select LTC3787EMSE#PBF only when >1A output current or synchronous rectification is required; LT8570HMS8E#PBF offers lower BOM cost and smaller footprint for ≤500mA applications. |
| LT3573EDD#PBF | Lower 40V switch rating, 0.35A current limit, fixed 1.2MHz frequency - lacks RT/SYNC adjustability and dual-mode FBX. | Optimized for fixed-frequency, low-EMI boost applications; cannot configure as SEPIC or inverting without additional components. | Choose LT3573EDD#PBF for simple 5V→12V boost where topology flexibility and programmable frequency are unnecessary; LT8570HMS8E#PBF adds design reuse across multiple rail types. |
Compared with LTC3787EMSE#PBF and LT3573EDD#PBF, the LT8570HMS8E#PBF uniquely combines integrated 65V/0.5A switching, triple-topology support, and programmable UVLO in an MSOP-8 package - making it optimal for space-constrained, multi-rail bias generation where component count and layout simplicity are critical.
Availability
LT8570HMS8E#PBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, VFD display drivers, and GPS receiver power management requiring stable component supply across extended temperature ranges.
Supply support for LT8570HMS8E#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, datasheets, and application engineering for legacy Linear parts including the LT8570 family.
The LT8570 product line was designed specifically for high-voltage, low-to-moderate power DC/DC conversion in display bias, telecom, and industrial subsystems - emphasizing topology flexibility, thermal robustness, and ease of use in compact layouts.
FAQ
What is the maximum output voltage achievable with LT8570HMS8E#PBF in boost configuration?
The LT8570HMS8E#PBF supports output voltages up to 60V in boost topology, constrained by its 65V switch rating and practical considerations like diode reverse voltage and capacitor derating. At 40V input and 1.5MHz switching, typical designs achieve stable 48V–55V outputs with <2% regulation error across load and temperature. Always verify layout parasitics and thermal margin when operating near absolute maximum ratings.
Can LT8570HMS8E#PBF be used in SEPIC topology with coupled inductors?
Yes - the LT8570HMS8E#PBF is explicitly validated for SEPIC operation with coupled or uncoupled inductors, as shown in Figure 1 of the datasheet. Coupled inductors reduce size and ripple but require correct phasing (dotted ends connected per schematic); uncoupled versions offer greater layout flexibility. Both configurations maintain inherent input-output isolation and safe shutdown behavior.
How does the SHDN pin enable programmable undervoltage lockout on LT8570HMS8E#PBF?
The SHDN pin on LT8570HMS8E#PBF has a precise 1.21V–1.40V hysteresis window. By connecting a resistor divider from VIN to SHDN, designers set the exact turn-on threshold (e.g., 10kΩ + 4.99kΩ yields ~12.5V UVLO for 12V systems). This eliminates external supervisor ICs and allows adaptive brown-out protection aligned with system-level power sequencing requirements.
What is the purpose of the FBX pin's dual-reference capability in LT8570HMS8E#PBF?
The FBX pin on LT8570HMS8E#PBF accepts either +1.204V (for boost/SEPIC) or –3mV (for inverting) reference voltages - enabling one IC to regulate both positive and negative outputs by simply changing the RFBX connection polarity. This eliminates separate part numbers and simplifies inventory while preserving tight regulation (<1.5% total error) in both modes.
Does LT8570HMS8E#PBF require external compensation components?
Yes - the LT8570HMS8E#PBF requires external compensation on the VC pin: typically a series RC network (e.g., 6.19kΩ + 1nF) in parallel with a small capacitor (e.g., 47pF) to ground. This stabilizes the voltage loop against load transients and ensures phase margin >45°; compensation values depend on inductor value, output capacitance, and operating point.
LT8570HMS8E#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:
- 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-MSOP-EP
LT8570HMS8E#PBF FAQ
1.How can I place an order for LT8570HMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8570HMS8E#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 LT8570HMS8E#PBF reliable?
The price and inventory of LT8570HMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8570HMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LT8570HMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8570HMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8570HMS8E#PBF?
LT8570HMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8570HMS8E#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 LT8570HMS8E#PBF?
For technical support, including LT8570HMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8570HMS8E#PBF requirements.
6.How does Aetrix verify that LT8570HMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LT8570HMS8E#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 LT8570HMS8E#PBF meets industry standards.
7.What is the process for return or replacement of LT8570HMS8E#PBF?
All LT8570HMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8570HMS8E#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 LT8570HMS8E#PBF part is unused and in its original packaging.
Return procedure for LT8570HMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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