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Analog Devices Inc. LT8570IMS8E#PBF
- Part No.:
- LT8570IMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8570IMS8E#PBF.pdf
- Description:
- IC REG BOOST CUK ADJ 750MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,355
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Product details
Overview
LT8570IMS8E#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 industrial and portable power supplies. It integrates a 65V NPN switch, adjustable 200kHz–1.5MHz oscillator, soft-start, synchronization input, and programmable UVLO. Confirmed parameters: 2.55V–40V input range, 1.204V positive FB reference, 250mV VCE(SAT) at 0.4A, 100ns minimum on-time, and MSOP-8 package with exposed thermal pad.
For engineers reviewing the LT8570IMS8E#PBF datasheet, LT8570IMS8E#PBF pinout, LT8570IMS8E#PBF application, or LT8570IMS8E#PBF equivalent, this page delivers verified topology flexibility (boost/SEPIC/inverting), precise shutdown threshold (1.21V–1.40V hysteresis), thermal-aware package data (θJA = 35–40°C/W), and real-world current limit behavior across duty cycle and temperature - all critical for reliable high-voltage DC/DC design.
Technical Context
The LT8570IMS8E#PBF employs constant-frequency current-mode control with internal slope compensation to ensure stability up to 50% duty cycle and prevent subharmonic oscillation. 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.
Switching frequency is set either by an external RT resistor (56.2kΩ → 1.5MHz typical) or synchronized to an external clock (1.3V high / 0.4V low logic levels). Frequency foldback activates when FBX voltage falls between 300mV–920mV, reducing fOSC to 1/6 nominal to improve startup control under light loads or high duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.55V to 40V - supports wide-input industrial rails and automotive cold-crank conditions without pre-regulation. |
| Switch Rating | 65V / 0.5A - enables 12V→24V/48V boost, ±15V inverting, or 5V→36V SEPIC with single-stage conversion. |
| Feedback Reference | 1.204V (positive) or 3mV (negative) - allows precise output setting in both noninverting and inverting modes using one resistor. |
| Switching Frequency | 200kHz to 1.5MHz - adjustable via RT pin or external SYNC; higher frequencies reduce inductor size but increase switching loss. |
| VCE(SAT) | 250mV at 0.4A - low conduction loss improves efficiency in high-current boost stages and reduces thermal stress. |
| Soft-Start Current | 4–8µA - charges external SS capacitor linearly, enabling controlled inrush current and predictable startup timing. |
| SHDN Threshold | 1.21V (falling) / 1.40V (rising) with 40mV hysteresis - supports clean enable/disable using RC networks or microcontroller GPIOs. |
| Min On/Off Time | 100ns each - ensures stable operation at high frequencies and high input-to-output voltage ratios. |
Pinout & Package
LT8570IMS8E#PBF is housed in an 8-lead plastic MSOP package (3mm × 3mm footprint) with exposed thermal pad (Pin 9 = GND), θJA = 35–40°C/W. The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (1) | Positive/Negative Feedback Input | Accepts 1.204V reference for boost/SEPIC or 3mV reference for inverting topologies; bias current 81–85µA enables single-resistor VOUT setting. |
| VC (2) | Error Amplifier Output | Drives external RC compensation network; transconductance 200µmhos and gain 60V/V define loop stability margins. |
| VIN (3) | Main Input Supply | Supplies internal circuitry and switch driver; requires local 0.47–1µF ceramic bypass capacitor near pin. |
| SW (4) | Switch Collector Node | Connects to external inductor/diode; 65V rating and 250mV VCE(SAT) support high-efficiency high-voltage switching. |
| SHDN (5) | Enable/Shutdown Control | High-gain input accepts slow-ramping signals; 40mV hysteresis prevents chatter during UVLO transitions. |
| RT (6) | Oscillator Timing Input | Resistor-to-ground sets free-running frequency (e.g., 56.2kΩ → 1.5MHz); open-drain SYNC overrides RT when driven. |
| SS (7) | Soft-Start Capacitor Node | Internally charged at 4–8µA; external capacitor (100nF–1µF) controls ramp time and limits inrush current. |
| SYNC (8) | External Clock Input | Accepts 0–2V clock with 35–65% duty cycle; high level ≥1.3V, low level ≤0.4V; forces synchronization or reverts to RT mode. |
| GND (9, Exposed Pad) | Power & Signal Ground | Thermal and electrical reference; exposed pad must be soldered to PCB ground plane for θJA compliance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports boost, SEPIC, and inverting configurations via external component routing - eliminates need for multiple part numbers. |
| Programmable UVLO | SHDN pin enables user-defined undervoltage lockout using resistor divider from VIN - simplifies input rail monitoring without external comparators. |
| Frequency Foldback | Reduces switching frequency to 1/6 nominal when FBX voltage is 300–920mV - improves controllability during startup and light-load conditions. |
| Thermally Enhanced MSOP | 8-lead MSOP with exposed GND pad achieves θJA = 35–40°C/W - enables >1W continuous power dissipation in compact layouts. |
| Robust Switch Protection | Integrated current limit (0.5A) and thermal shutdown (~165°C) protect internal NPN switch and external magnetics during overload or fault events. |
| Synchronization Capability | SYNC pin accepts standard logic-level clocks - enables EMI reduction via spread-spectrum or noise-sensitive system clock alignment. |
Applications
| VFD Bias Supplies | TFT-LCD Bias Supplies |
|---|---|
|
Use Scenario: Generating ±15V to ±30V rails for vacuum fluorescent display segment drivers from a 5V or 12V main supply. IC Role / Device Role / Timing Role: LT8570IMS8E#PBF operates in inverting configuration to produce negative bias while simultaneously boosting positive rail in SEPIC mode. Use Value: Single-chip solution replaces dual converters; 65V switch rating accommodates high VOUT without cascading stages; soft-start prevents display flicker at power-on. |
Use Scenario: Providing AVDD (15–20V), VGH (25–30V), and VGL (–7 to –10V) for TFT-LCD source/gate drivers in handheld instrumentation. IC Role / Device Role / Timing Role: LT8570IMS8E#PBF configured as boost for AVDD/VGH and inverting for VGL, sharing feedback and timing resources. Use Value: 200kHz–1.5MHz frequency adjustability allows EMI optimization around display pixel clock harmonics; MSOP-8 fits tight board space near LCD connector. |
| GPS Receivers | DSL Modems |
|
Use Scenario: Powering LNA and RF front-end stages requiring low-noise 3.3V or 5V from a 3.6V Li-ion battery with minimal quiescent current. IC Role / Device Role / Timing Role: LT8570IMS8E#PBF used in boost mode with light-load efficiency optimization via frequency foldback and low 1.2mA quiescent current. Use Value: 2.55V minimum input enables full battery discharge down to 3.2V; SHDN hysteresis prevents brownout oscillation during RF burst transmission. |
Use Scenario: Generating isolated ±12V analog rails for line-driver amplifiers and 3.3V digital core supply in ADSL2+ CPE modems operating from 12V wall adapter. IC Role / Device Role / Timing Role: LT8570IMS8E#PBF implements SEPIC topology to maintain regulation during 12V input ripple and transient dips. Use Value: Input range (2.55–40V) tolerates wide adapter tolerance and surge; 65V switch withstands 40V transients per GR-1089; MSOP package eases thermal management near line interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EMSE#PBF | 4-switch synchronous buck-boost controller (no integrated switch); supports 4–36V input, up to 80V output; requires external MOSFETs. | Higher efficiency (>94%) and higher output current capability, but needs 4 external FETs and more complex layout. | Select LTC3789EMSE#PBF when >2A output current or >92% efficiency is required; avoid if board space or BOM count is constrained. |
| LT8330EDDB#PBF | 60V monolithic boost/SEPIC/inverting converter with 1.5A switch; 2.8–40V input; fixed 2MHz switching frequency; no SYNC or RT pin. | Higher current capability and smaller DFN package, but lacks frequency adjustability and synchronization - limits EMI control. | Select LT8330EDDB#PBF for higher output current (up to 1.5A) where fixed 2MHz operation suffices; retain LT8570IMS8E#PBF when variable frequency or clock sync is needed. |
Compared with LTC3789EMSE#PBF and LT8330EDDB#PBF, the LT8570IMS8E#PBF offers unique mid-range current (0.5A), adjustable frequency (200kHz–1.5MHz), and synchronization - making it optimal for compact, noise-sensitive, moderate-power applications where integration and flexibility outweigh peak efficiency or current demands.
Availability
LT8570IMS8E#PBF is available at Aetrix Electronics and suitable for GPS receivers, TFT-LCD bias supplies, DSL modems, VFD displays, and industrial sensor nodes requiring stable component supply across extended temperature ranges (–40°C to +125°C).
Supply support for LT8570IMS8E#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 precision instrumentation, communications, and industrial markets.
The LT8570 product line was designed for flexible, high-voltage DC/DC conversion in space-constrained applications - delivering topology agility (boost/SEPIC/inverting), robust protection, and thermal efficiency in miniature MSOP and DFN packages.
FAQ
What topology configurations does the LT8570IMS8E#PBF support?
The LT8570IMS8E#PBF supports three distinct DC/DC topologies: boost, SEPIC, and inverting - selected solely by external component routing. Its dual-amplifier FBX pin accepts either 1.204V (noninverting) or 3mV (inverting) reference, enabling VOUT setting with one resistor in any configuration. No internal configuration bits or external mode pins are required, and the LT8570IMS8E#PBF maintains full current limit and thermal protection across all modes.
What is the maximum achievable output voltage using the LT8570IMS8E#PBF?
The LT8570IMS8E#PBF features a 65V-rated internal NPN switch, limiting the maximum sustainable output voltage to ≤65V minus diode forward drop and VCE(SAT). In practice, reliable operation is confirmed up to 48V output in boost mode (e.g., 12V→48V) and ±30V in inverting/SEPIC modes. Exceeding 60V risks switch breakdown under transient conditions, and the LT8570IMS8E#PBF datasheet specifies absolute maximum SW voltage as 65V.
How does the LT8570IMS8E#PBF handle input undervoltage lockout (UVLO)?
The LT8570IMS8E#PBF implements programmable UVLO via its SHDN pin: applying a resistor divider from VIN to SHDN sets the turn-on threshold (e.g., 1.25V at SHDN = 1.21V falling edge). The 40mV hysteresis prevents oscillation during brownout. Unlike fixed-threshold ICs, this method allows precise, temperature-stable UVLO tuning without external comparators - a key feature confirmed in the LT8570IMS8E#PBF Electrical Characteristics table.
Can the LT8570IMS8E#PBF be synchronized to an external clock, and what are the requirements?
Yes, the LT8570IMS8E#PBF supports external synchronization via the SYNC pin. The clock must have a high level ≥1.3V, low level ≤0.4V, and duty cycle between 35% and 65%. When SYNC is driven below 0.4V, the LT8570IMS8E#PBF reverts to free-running mode set by the RT resistor. This capability is explicitly validated in the Absolute Maximum Ratings and Electrical Characteristics sections of the LT8570IMS8E#PBF datasheet.
What thermal performance can be expected from the LT8570IMS8E#PBF in MSOP-8 package?
The LT8570IMS8E#PBF in MSOP-8 package has a specified θJA of 35–40°C/W when the exposed thermal pad (Pin 9) is soldered to a minimum 1-inch² copper area on the PCB. Under typical 0.5A load and 1MHz switching, junction temperature rise remains <45°C above ambient - enabling reliable operation at +125°C ambient when derated per the datasheet's thermal shutdown threshold (~165°C). This thermal behavior is measured and guaranteed per the LT8570IMS8E#PBF order information table.
LT8570IMS8E#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
LT8570IMS8E#PBF FAQ
1.How can I place an order for LT8570IMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8570IMS8E#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 LT8570IMS8E#PBF reliable?
The price and inventory of LT8570IMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8570IMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LT8570IMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8570IMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8570IMS8E#PBF?
LT8570IMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8570IMS8E#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 LT8570IMS8E#PBF?
For technical support, including LT8570IMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8570IMS8E#PBF requirements.
6.How does Aetrix verify that LT8570IMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LT8570IMS8E#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 LT8570IMS8E#PBF meets industry standards.
7.What is the process for return or replacement of LT8570IMS8E#PBF?
All LT8570IMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8570IMS8E#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 LT8570IMS8E#PBF part is unused and in its original packaging.
Return procedure for LT8570IMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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