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Analog Devices Inc. LT8570HMS8E-1#PBF
- Part No.:
- LT8570HMS8E-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8570HMS8E-1#PBF.pdf
- Description:
- IC REG BOOST CUK ADJ 250MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,240
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Product details
Overview
LT8570HMS8E-1#PBF from Analog Devices (formerly Linear Technology) is a 65V, 0.25A monolithic PWM DC/DC converter optimized for boost, SEPIC, and inverting topologies in space-constrained industrial and automotive power supplies. It features adjustable 200kHz–1.5MHz switching frequency, integrated soft-start, synchronization capability, and user-configurable undervoltage lockout. Designed for TFT-LCD bias, GPS receiver local supplies, and DSL modem auxiliary rails.
For engineers reviewing the LT8570HMS8E-1#PBF datasheet, LT8570HMS8E-1#PBF pinout, LT8570HMS8E-1#PBF application, or LT8570HMS8E-1#PBF equivalent, key selection criteria include its 0.25A current limit, –40°C to 150°C operating junction temperature, MSOP-8 package with exposed thermal pad, and dual-mode FBX feedback architecture supporting both noninverting and inverting configurations.
Technical Context
The LT8570HMS8E-1#PBF employs constant-frequency current-mode control with internal slope compensation to ensure stability across duty cycles up to 85% at 200kHz. Its dual-path error amplifier (A1/A2) enables seamless reconfiguration between noninverting (1.204V reference) and inverting (3mV reference) feedback modes via external resistor connection to the FBX pin.
Switching frequency is set by an external RT resistor or synchronized to an external clock (1.3V high / 0.4V low logic levels), with foldback operation reducing fOSC to 1/6 nominal during soft-start or low-FBX conditions. The SHDN pin supports slow-ramping enable signals and programmable UVLO via external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Voltage Rating | 65V - supports input-to-output voltage differentials up to 65V, enabling wide-range boost and inverting designs. |
| Current Limit | 0.25A - fixed peak switch current limit for LT8570-1 variant, limiting maximum output power in continuous conduction mode. |
| Input Voltage Range | 2.55V to 40V - accommodates 3.3V, 5V, 12V, and 24V rail inputs while maintaining regulation down to battery brownout levels. |
| Switching Frequency Range | 200kHz to 1.5MHz - adjustable via RT pin or external SYNC signal, balancing EMI, efficiency, and component size. |
| Operating Junction Temp | –40°C to 150°C - qualified for under-hood automotive and high-ambient industrial environments without derating. |
| Feedback Reference | 1.204V (noninverting) or 3mV (inverting) - dual-mode FBX architecture allows single-part reuse across boost, SEPIC, and inverting topologies. |
| Quiescent Current | 1.7mA (active), <1µA (shutdown) - enables low-power standby operation in always-on systems. |
Pinout & Package
LT8570HMS8E-1#PBF is housed in an 8-lead plastic MSOP package (MS8E) with exposed thermal pad (Pin 9 = GND), offering θJA = 35–40°C/W and requiring soldering of the exposed pad to PCB ground for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (1) | Positive/Negative Feedback Input | Accepts either 1.204V (boost/SEPIC) or 3mV (inverting) reference; sets output voltage via single resistor RFBX = |VOUT − VFBX| / 83.3µA. |
| VC (2) | Error Amplifier Output | Connects to external RC compensation network (e.g., 6.19kΩ + 1nF + 47pF) to stabilize voltage loop across load/transient conditions. |
| VIN (3) | Main Input Supply | 2.55V–40V input rail; requires local 0.22–0.47µF ceramic bypass capacitor placed adjacent to pin. |
| SW (4) | Switch Collector Node | Drives external diode/inductor; 65V-rated NPN switch with 250mV VCE(SAT) at 0.2A; minimize trace area to reduce EMI. |
| SHDN (5) | Enable/Shutdown Control | High-threshold (1.21–1.40V) with 40mV hysteresis; accepts slow-ramping signals; enables programmable UVLO via resistor divider. |
| RT (6) | Oscillator Timing Input | Resistor-to-ground sets free-running frequency (e.g., 56.2kΩ → 1.5MHz); floating disables oscillator. |
| SS (7) | Soft-Start Capacitor Node | Charged by internal 280kΩ current source to ~2.1V; external capacitor (100nF–1µF) controls ramp rate and inrush limiting. |
| SYNC (8) | External Clock Input | Accepts TTL/CMOS clock (≥1.3V high, ≤0.4V low); overrides internal oscillator when driven; duty cycle 35–65% supported. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Mode Feedback Architecture | Single FBX pin supports both noninverting (1.204V ref) and inverting (3mV ref) topologies-eliminates need for separate part numbers for boost vs. inverting bias supplies. |
| Programmable Undervoltage Lockout | UVLO threshold set via external resistor divider on SHDN pin-enables precise brownout protection aligned with system-level supply sequencing. |
| Frequency Foldback During Soft-Start | Reduces switching frequency to 1/6 nominal when FBX voltage is between 300mV–920mV-lowers minimum duty cycle to improve startup reliability under heavy loads. |
| Thermally Enhanced MSOP-8 Package | Exposed GND pad with θJA = 35–40°C/W-delivers 150°C junction rating without heatsink in typical 2-layer PCB layouts. |
| Integrated Soft-Start with Discharge Protection | Internal SS capacitor discharge on SHDN glitch prevents false restarts; controlled 280kΩ charge current ensures predictable ramp time independent of external component tolerance. |
Applications
| TFT-LCD Bias Supply | GPS Receiver Local Power |
|---|---|
Use Scenario: Generating ±15V rails from 3.3V or 5V main supply for LCD column/row drivers in automotive infotainment displays. IC Role / Device Role / Timing Role: Configured as dual-inductor inverting converter to deliver low-ripple negative output; FBX pin biased to 3mV reference. Use Value: Eliminates need for external inverter IC or transformer; achieves <10mVpp ripple due to series output inductor L2, meeting display pixel uniformity requirements. |
Use Scenario: Providing stable 3.3V LDO input rail from variable 5–24V vehicle battery in GPS tracking modules. IC Role / Device Role / Timing Role: Operated as SEPIC converter to maintain regulation during cold-crank (4.5V) and load-dump (36V) transients. Use Value: Input-to-output isolation inherent to SEPIC topology prevents battery transients from propagating to sensitive RF front-end circuitry. |
| DSL Modem Auxiliary Rail | Industrial Sensor Signal Chain Bias |
Use Scenario: Generating isolated 12V bias for line-driver amplifiers in xDSL CPE equipment powered from 12V wall adapter. IC Role / Device Role / Timing Role: Used in boost configuration with 1.204V FBX reference; synchronized to system clock to avoid beat frequencies with ADSL2+ upstream bands. Use Value: 1.5MHz max switching frequency enables use of 22µH shielded inductor <3mm × 3mm, reducing board area by 40% vs. 500kHz solutions. |
Use Scenario: Creating precision ±5V analog supply from 24V factory bus for 24-bit delta-sigma ADC front-ends in process control I/O modules. IC Role / Device Role / Timing Role: Dual LT8570HMS8E-1#PBF devices-one in boost (VOUT = +5V), one in inverting (VOUT = –5V)-sharing common RT/SYNC lines. Use Value: Matched switching frequency and thermal design ensure symmetrical noise coupling and <0.1% cross-regulation between rails over –40°C to 150°C. |
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-1#PBF | 4-channel buck-boost with I2C interface; 600mA per channel; no inverting mode; requires external MOSFETs for >65V operation. | Targeted at multi-rail portable systems with dynamic voltage scaling; lacks native 65V switch and inverting topology support. | Select when digital control, multiple outputs, or higher current per rail is required-but not for direct 65V inverting bias replacement. |
| MAX17595ATP+T | 65V synchronous step-up controller; external MOSFETs; 0.5A current sense threshold; no integrated soft-start or SYNC pin. | Designed for high-efficiency, high-current boost converters where layout flexibility and thermal management outweigh integration benefits. | Choose for >1A output applications needing discrete FET optimization-but not for space-constrained inverting or SEPIC designs requiring minimal BOM count. |
Compared with LTC3589EUF-1#PBF and MAX17595ATP+T, LT8570HMS8E-1#PBF uniquely integrates a 65V/0.25A switch, dual-mode feedback, and inverting capability in an MSOP-8 package-making it the only option for thermally demanding, single-chip ±V bias generation below 250mA.
Availability
LT8570HMS8E-1#PBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, GPS receiver local power, and DSL modem auxiliary rails requiring stable component supply across extended temperature ranges.
Supply support for LT8570HMS8E-1#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors for precision instrumentation, industrial automation, and automotive systems.
The LT8570/LT8570-1 product line was designed specifically for compact, high-voltage DC/DC conversion in display bias, telecom, and automotive subsystems-emphasizing topology flexibility (boost/SEPIC/inverting), thermal robustness, and ease of loop compensation.
FAQ
What is the maximum duty cycle supported by LT8570HMS8E-1#PBF at 1.5MHz switching frequency?
The LT8570HMS8E-1#PBF supports a maximum duty cycle of 0.4 at 1.5MHz, as specified in the Electrical Characteristics table. This limitation arises from the minimum off-time of 100ns and ensures stable current-mode control. Exceeding this duty cycle risks subharmonic oscillation unless slope compensation is augmented externally. Designers must verify operating duty cycle using the formula DC ≅ (VOUT − VIN + VD) / (VOUT + VD − VCE(SAT)) for boost configurations. The LT8570HMS8E-1#PBF datasheet provides detailed guidance on duty cycle constraints across topologies.
Can LT8570HMS8E-1#PBF be used in an inverting configuration without changing the PCB layout?
Yes, LT8570HMS8E-1#PBF supports inverting operation without PCB layout changes-only external component connections differ. To configure as inverting, connect the FBX pin to VOUT via RFBX = (VOUT + 3mV) / 83.3µA and route the output through L2 in series. The same MSOP-8 footprint, VIN, SW, GND, and compensation network remain unchanged. This topology leverages the LT8570HMS8E-1#PBF's dual-path error amplifier (A2 active) and delivers low-ripple negative output ideal for sensor bias rails. No additional ICs or layout revisions are needed.
How does the SHDN pin on LT8570HMS8E-1#PBF handle slowly varying input signals?
The SHDN pin on LT8570HMS8E-1#PBF incorporates high-gain input circuitry with 40mV hysteresis (1.21V to 1.33V transition range), enabling reliable operation with slowly ramping enable signals such as thermistor-based thermal monitors or RC-delayed power-good assertions. Unlike standard CMOS inputs, it accepts input slew rates as low as 10mV/s without chatter. When pulled below 0.3V, LT8570HMS8E-1#PBF enters shutdown drawing <1µA; above 1.40V, it initiates full soft-start. This behavior is intrinsic to the LT8570HMS8E-1#PBF's internal comparator design and requires no external Schmitt trigger.
What is the recommended output capacitor value for LT8570HMS8E-1#PBF in a 12V boost application?
For a 12V boost application, the LT8570HMS8E-1#PBF datasheet recommends a 0.1µF to 2.2µF ceramic output capacitor-X5R or X7R dielectric preferred for voltage/temperature stability. A 1µF, 16V, 0603-case MLCC (e.g., Murata GRM188R61C105KAAL) is optimal: it provides <5mΩ ESR to minimize ripple, fits within the MSOP-8 thermal constraints, and maintains ≥80% capacitance at 12V bias. Larger values risk instability due to interaction with the VC compensation network; smaller values increase ripple beyond the 10mVpp target for analog bias rails. Always verify with the LT8570HMS8E-1#PBF's transient response test.
Is LT8570HMS8E-1#PBF pin-compatible with other members of the LT8570 family?
Yes, LT8570HMS8E-1#PBF shares identical pinout and package (MS8E) with all LT8570 and LT8570-1 variants-including LT8570EMS8E#PBF and LT8570IMS8E-1#PBF-enabling drop-in replacement across temperature grades and current ratings. The only functional differences are the 0.25A current limit (vs. 0.5A in LT8570) and guaranteed 150°C junction operation (vs. 125°C in E/I grades). No PCB redesign is needed when upgrading from LT8570EMS8E-1#PBF to LT8570HMS8E-1#PBF for enhanced thermal performance in automotive under-hood applications.
LT8570HMS8E-1#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:
- 250mA (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-1#PBF FAQ
1.How can I place an order for LT8570HMS8E-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8570HMS8E-1#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-1#PBF reliable?
The price and inventory of LT8570HMS8E-1#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-1#PBF is usually 5 days.
3.What payment methods are accepted for LT8570HMS8E-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8570HMS8E-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8570HMS8E-1#PBF?
LT8570HMS8E-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8570HMS8E-1#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-1#PBF?
For technical support, including LT8570HMS8E-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8570HMS8E-1#PBF requirements.
6.How does Aetrix verify that LT8570HMS8E-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT8570HMS8E-1#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-1#PBF meets industry standards.
7.What is the process for return or replacement of LT8570HMS8E-1#PBF?
All LT8570HMS8E-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8570HMS8E-1#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-1#PBF part is unused and in its original packaging.
Return procedure for LT8570HMS8E-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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