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Analog Devices Inc. LT8570IMS8E#TRPBF
- Part No.:
- LT8570IMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8570IMS8E#TRPBF.pdf
- Description:
- IC REG BOOST CUK ADJ 750MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,651
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Product details
Overview
LT8570IMS8E#TRPBF from Analog Devices (formerly Linear Technology) is a 65V, 0.5A PWM DC/DC converter IC in an 8-lead MSOP package, configurable as boost, SEPIC, or inverting topology. It features adjustable 200kHz–1.5MHz switching frequency, integrated soft-start, synchronization capability, and 2.55V–40V input range - used in TFT-LCD bias supplies and GPS receiver local power rails.
For engineers reviewing the LT8570IMS8E#TRPBF datasheet, LT8570IMS8E#TRPBF pinout, LT8570IMS8E#TRPBF application, or LT8570IMS8E#TRPBF equivalent, key selection criteria include its 0.5A switch current limit, 65V switch rating, UVLO programmability via SHDN pin, and compatibility with thermally demanding industrial embedded designs requiring stable high-voltage DC/DC conversion.
Technical Context
The LT8570IMS8E#TRPBF employs constant-frequency current-mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its dual-amplifier FBX architecture supports both noninverting (1.204V reference) and inverting (3mV reference) feedback configurations without external component changes.
It integrates frequency foldback during soft-start (reducing fOSC to 1/6 nominal), a high-gain SHDN pin accepting slowly ramping enable signals, and thermal shutdown at ~165°C with automatic restart below ~160°C. The VC pin provides direct access to the error amplifier output for loop compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Rating | 65V collector-emitter breakdown - enables use in 48V industrial bus and automotive load-dump tolerant designs. |
| Switch Current Limit | 0.5A (typical at 50% duty cycle) - sets maximum deliverable output current in boost/SEPIC/inverting topologies. |
| Input Voltage Range | 2.55V to 40V - supports wide-input applications including battery-powered GPS receivers and DSL modems. |
| Switching Frequency | 200kHz to 1.5MHz (adjustable via RT resistor or external SYNC clock) - allows EMI optimization and compact magnetics selection. |
| Feedback Reference | 1.204V (noninverting) or 3mV (inverting) - enables single-resistor VOUT programming for both polarity configurations. |
| Soft-Start Control | Internal 280kΩ pull-up to ~2.1V on SS pin - permits controlled ramp of peak switch current using external capacitor (100nF–1µF). |
| UVLO Threshold | User-programmable via SHDN pin resistor divider (1.21V–1.40V hysteresis) - ensures reliable startup under brownout conditions. |
Pinout & Package
LT8570IMS8E#TRPBF is housed in an 8-lead plastic MSOP package (3mm × 3mm footprint, exposed pad) with θJA = 35–40°C/W. The exposed pad (Pin 9) must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (Pin 1) | Positive/Negative Feedback Input | Accepts either 1.204V (boost/SEPIC) or 3mV (inverting) reference; determines output voltage via single RFBX. |
| VC (Pin 2) | Error Amplifier Output | Provides access to compensation node; requires RC network to GND for loop stability. |
| VIN (Pin 3) | Main Input Supply | 2.55V–40V input rail; requires local ceramic bypass (0.47µF–1µF) adjacent to pin. |
| SW (Pin 4) | Switch Collector Node | 65V NPN collector output; connects to inductor/diode; trace area must be minimized for EMI control. |
| SHDN (Pin 5) | Enable/Shutdown Control | High-gain input enabling slow-ramp startup and programmable UVLO (1.21V low → shutdown, 1.40V high → active). |
| RT (Pin 6) | Oscillator Timing Input | Resistor-to-ground sets free-running frequency; open-drain SYNC overrides when driven. |
| SS (Pin 7) | Soft-Start Capacitor Node | Charged by internal 280kΩ current source; external cap controls ramp time and inrush limiting. |
| SYNC (Pin 8) | External Clock Input | Accepts 0.4V–1.3V logic levels; synchronizes switching to external clock or reverts to internal oscillator if <0.4V. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-Topology Flexibility | Single IC supports boost, SEPIC, and inverting configurations via external component routing - reduces BOM count and design reuse effort. |
| Programmable UVLO | SHDN pin accepts resistor-divider bias to set precise turn-on voltage (e.g., 24V system startup at 22.5V) - eliminates need for external supervisor IC. |
| Frequency Foldback | Reduces switching frequency to 1/6 nominal during soft-start when FBX is between 300mV–920mV - improves controllability at light loads and startup. |
| Low VCE(SAT) | 250mV @ 0.4A - minimizes conduction loss in high-current boost stages, improving efficiency at >1A output loads. |
| Thermally Enhanced MSOP | Exposed-pad 8-lead MSOP package with θJA ≤ 40°C/W - enables 1.5W+ continuous power dissipation without heatsink in compact layouts. |
Applications
| TFT-LCD Bias Supply | GPS Receiver Local Power |
|---|---|
|
Use Scenario: Generating ±15V rails from 3.3V or 5V battery supply for LCD gate/source drivers. IC Role / Device Role / Timing Role: Inverting topology IC delivering negative output; uses internal 3mV FBX reference and dual-inductor layout for low ripple. Use Value: Eliminates need for separate negative charge-pump IC; achieves <15mVpp ripple with shielded inductors and ceramic output caps. |
Use Scenario: Providing regulated 5V/3.3V local supply from automotive 9–16V battery in GPS tracking modules. IC Role / Device Role / Timing Role: Boost converter operating across wide VIN range; leverages 40V absolute max rating for load-dump immunity. Use Value: Maintains regulation during cold-crank (6.5V) and load-dump (40V) transients without external TVS or LDO pre-regulator. |
| DSL Modem Power Stage | VFD Display Bias Generator |
|
Use Scenario: Generating isolated 12V/–12V rails for line-driver amplifiers in ADSL/VDSL CPE equipment. IC Role / Device Role / Timing Role: SEPIC topology IC enabling input-to-output overlap (VIN ≈ VOUT); provides inherent output disconnect during shutdown. Use Value: Prevents backfeed from output capacitors into input during power-down - critical for compliance with GR-902 safety requirements. |
Use Scenario: Driving vacuum fluorescent display (VFD) grids requiring +30V to +60V from 5V microcontroller rail. IC Role / Device Role / Timing Role: High-voltage boost converter with 65V switch; operates at 1.2MHz to minimize inductor size in space-constrained front-panel designs. Use Value: Enables <3mm × 3mm DFN/MSOP footprint for HV bias generation - replaces discrete transistor+driver solutions occupying >200mm². |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EMS#TRPBF | 4-switch synchronous buck-boost controller (no integrated switch); supports 4–36V input, up to 60V output; requires external MOSFETs. | Used where >2A output current or >90% efficiency at high power is required; not suitable for space-constrained low-IOUT bias rails. | Select LTC3780EMS#TRPBF only when designing for >1.5A loads or needing programmable current limit and phase-sync capability. |
| LT8330EMSE#TRPBF | 60V monolithic boost converter with 1.5A switch; fixed 2MHz switching; no SEPIC/inverting support; smaller 10-lead MSE package. | Optimized for high-frequency, low-ripple boost-only applications (e.g., LED drivers); lacks multi-topology flexibility and UVLO programmability. | Choose LT8330EMSE#TRPBF for compact 2MHz boost designs where inverting/SEPIC is unnecessary and higher current is needed. |
Compared with LTC3780EMS#TRPBF and LT8330EMSE#TRPBF, the LT8570IMS8E#TRPBF uniquely combines integrated 0.5A/65V switch, triple-topology configurability, and programmable UVLO in a thermally optimized MSOP - making it optimal for mid-power, multi-rail bias generation where layout area and design reuse matter.
Availability
LT8570IMS8E#TRPBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, GPS receiver local power, and DSL modem power stages requiring stable component supply across industrial temperature ranges (–40°C to 125°C).
Supply support for LT8570IMS8E#TRPBF 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 medical markets.
The LT8570 product line was designed specifically for compact, high-voltage DC/DC bias generation in space- and thermal-constrained applications - emphasizing topology flexibility, robust protection, and ease of loop compensation.
FAQ
What topology configurations does the LT8570IMS8E#TRPBF support?
The LT8570IMS8E#TRPBF supports three distinct DC/DC topologies: boost, SEPIC, and inverting - selected solely by external component routing. Its dual-reference FBX pin (1.204V for noninverting, 3mV for inverting) enables seamless reconfiguration without changing the IC or feedback network. This makes LT8570IMS8E#TRPBF ideal for platforms requiring multiple output polarities from a single BOM.
How is the output voltage set on the LT8570IMS8E#TRPBF?
The LT8570IMS8E#TRPBF uses a single resistor (RFBX) from VOUT to the FBX pin to set output voltage. For boost/SEPIC, RFBX = (VOUT − 1.204V)/83.3µA; for inverting, RFBX = (VOUT + 3mV)/83.3µA. This eliminates trimming potentiometers and simplifies production calibration - a key advantage of LT8570IMS8E#TRPBF over traditional op-amp-based regulators.
Does the LT8570IMS8E#TRPBF require external compensation components?
Yes, the LT8570IMS8E#TRPBF requires external compensation: a series RC network plus parallel capacitor from VC to GND. Recommended starting values are 1nF series cap, 47pF parallel cap, and 6.19kΩ resistor - tuned via transient testing. Unlike fixed-compensation ICs, this gives designers full control over phase margin and bandwidth, which is essential for LT8570IMS8E#TRPBF's multi-topology operation.
What is the purpose of the SYNC pin on the LT8570IMS8E#TRPBF?
The SYNC pin on the LT8570IMS8E#TRPBF allows synchronization of the internal oscillator to an external clock signal (200kHz–1.5MHz), reducing EMI by eliminating beat frequencies in multi-rail systems. Driving SYNC below 0.4V reverts to free-running mode. This feature is critical for LT8570IMS8E#TRPBF deployments in noise-sensitive RF modules like GPS receivers where spectral purity matters.
Can the LT8570IMS8E#TRPBF operate with input voltages below 3V?
Yes, the LT8570IMS8E#TRPBF operates down to 2.55V input - verified across –40°C to 125°C. This enables direct use with single-cell Li-ion (2.7–4.2V) or NiMH (2.4–3.6V) batteries in portable GPS or handheld VFD displays. Its low dropout behavior and 0.5A switch ensure stable regulation even at end-of-discharge, distinguishing LT8570IMS8E#TRPBF from many 3V-minimum competitors.
LT8570IMS8E#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT8570IMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8570IMS8E#TRPBF 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#TRPBF reliable?
The price and inventory of LT8570IMS8E#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8570IMS8E#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8570IMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8570IMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8570IMS8E#TRPBF?
LT8570IMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8570IMS8E#TRPBF 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#TRPBF?
For technical support, including LT8570IMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8570IMS8E#TRPBF requirements.
6.How does Aetrix verify that LT8570IMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8570IMS8E#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8570IMS8E#TRPBF?
All LT8570IMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8570IMS8E#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT8570IMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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