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Analog Devices Inc. LT8570EMS8E#TRPBF
- Part No.:
- LT8570EMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8570EMS8E#TRPBF.pdf
- Description:
- IC REG BOOST CUK ADJ 750MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,481
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Product details
Overview
LT8570EMS8E#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 regulator for bias supply generation in TFT-LCD and VFD displays. It features adjustable 200kHz–1.5MHz switching frequency, integrated soft-start, synchronization capability, and 2.55V–40V input range.
For engineers reviewing the LT8570EMS8E#TRPBF datasheet, LT8570EMS8E#TRPBF pinout, LT8570EMS8E#TRPBF application, or LT8570EMS8E#TRPBF equivalent, key selection criteria include its 0.5A switch current limit, 65V switch rating, MSOP-8 thermal performance (θJA = 35–40°C/W), UVLO programmability via SHDN pin, and compatibility with boost/SEPIC/inverting topologies requiring compact, high-voltage DC/DC conversion.
Technical Context
The LT8570EMS8E#TRPBF employs constant-frequency current-mode control with internal slope compensation to ensure stability across duty cycles up to 85% at 200kHz. Its dual-feedback architecture supports both positive (1.204V reference) and negative (3mV reference) FBX configurations, enabling seamless topology reconfiguration without changing the IC.
It integrates a high-gain SHDN pin accepting slowly ramping enable signals, frequency foldback during soft-start (reducing fOSC to 1/6 nominal), and a 280kΩ internal soft-start charging resistor. The 0.04Ω typical VCE(SAT) switch delivers low conduction loss at 0.4A, while the RT pin allows precise oscillator setting or external SYNC clock locking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Rating | 65V collector-emitter breakdown - enables direct regulation from 48V industrial rails or automotive transients without external clamping. |
| Switch Current Limit | 0.5A (typical at 50% duty cycle) - sets maximum deliverable output power in boost/SEPIC; derates with duty cycle per datasheet curves. |
| Input Voltage Range | 2.55V to 40V - supports wide-input applications including battery-powered GPS receivers and DSL modems with unregulated inputs. |
| Switching Frequency | 200kHz to 1.5MHz (adjustable via RT or SYNC) - allows EMI optimization and small external magnetics (e.g., 22µH for 5V→12V boost). |
| Feedback Reference | 1.204V (noninverting) or 3mV (inverting) - enables single-resistor VOUT programming for both boost/SEPIC and inverting topologies. |
| Soft-Start Time | Programmable via SS capacitor (e.g., 100nF → ~28ms ramp) - prevents inrush current in bias supplies for sensitive display panels. |
| UVLO Threshold | User-configurable via SHDN resistor divider (1.21V–1.40V hysteresis) - ensures clean startup only when input meets system-level brownout requirements. |
Pinout & Package
LT8570EMS8E#TRPBF is housed in an 8-lead plastic MSOP package (MS8E) with exposed pad (Pin 9 = GND), θJA = 35–40°C/W. The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (1) | Positive/negative feedback input | Accepts either 1.204V-referenced (boost/SEPIC) or 3mV-referenced (inverting) feedback network; single RFBX sets VOUT. |
| VC (2) | Error amplifier output | Connects to RC-C compensation network; controls loop stability and transient response of voltage regulation loop. |
| VIN (3) | Main input supply | 2.55V–40V input rail; requires local 0.22–1µF ceramic bypass capacitor placed adjacent to pin. |
| SW (4) | Switch collector node | Drives external inductor/diode; high di/dt node - minimize trace area to reduce EMI and parasitic inductance. |
| SHDN (5) | Enable/shutdown control | High-gain input accepts slow-ramping signals; 1.21V–1.40V threshold with 40mV hysteresis enables programmable UVLO. |
| 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 0.4V–1.3V logic-low/high sync pulses; overrides internal oscillator when driven above 1.3V. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-topology support | Single IC replaces separate boost, SEPIC, and inverting controllers - reduces BOM count and design validation effort for multi-rail bias supplies. |
| 65V integrated NPN switch | Eliminates need for external high-voltage switch in 24V/48V input applications - simplifies layout and improves reliability over discrete solutions. |
| Adjustable UVLO via SHDN | Enables system-level brownout protection without additional supervisor IC - resistor divider directly programs turn-on/off thresholds. |
| Frequency foldback during start-up | Reduces minimum duty cycle by lowering fOSC to 1/6 nominal - improves controllability of peak switch current during soft-start. |
| Synchronization capability | Allows alignment of switching edges with system clocks or other converters - critical for noise-sensitive RF or imaging subsystems. |
Applications
| VFD Bias Supplies | TFT-LCD Bias Supplies |
|---|---|
Use Scenario: Generating +100V and –100V bias rails for vacuum fluorescent display segments and grids. IC Role / Device Role / Timing Role: Configured as dual inductor inverting converter to produce tightly regulated negative output with low ripple. Use Value: Single LT8570EMS8E#TRPBF replaces two discrete converters, reducing component count and board space while maintaining ±1% output regulation. |
Use Scenario: Providing AVDD (+15V), VGH (+25V), and VGL (–10V) for active-matrix LCD source/gate drivers. IC Role / Device Role / Timing Role: Used in SEPIC topology to maintain regulation across wide input (5V USB to 12V adapter) and variable load conditions. Use Value: Input-to-output disconnect inherent in SEPIC prevents backfeed during shutdown - essential for panel safety and power sequencing. |
| GPS Receivers | DSL Modems |
Use Scenario: Powering LNA and RF front-end stages from single-cell Li-ion (2.7V–4.2V) or 3.3V system rail. IC Role / Device Role / Timing Role: Operated as boost converter to generate stable 5V supply with <100mV ripple under pulsed RF load. Use Value: 200kHz–1.5MHz frequency adjustability allows EMI avoidance in GNSS band (1.575GHz fundamental harmonics). |
Use Scenario: Generating isolated ±12V rails for line driver/receiver ICs in ADSL/VDSL CPE equipment. IC Role / Device Role / Timing Role: Deployed in inverting configuration to derive negative rail from existing +12V system supply. Use Value: Integrated soft-start prevents voltage overshoot on sensitive analog line interface circuits during power-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3873EMS8E#TRPBF | Current-mode synchronous buck controller (no integrated switch); requires external MOSFETs; supports up to 60V input. | Not suitable for boost/SEPIC/inverting topologies; limited to step-down only; higher external component count. | Select only if step-down-only operation and >0.5A output current are required with external FET flexibility. |
| LT3580EMS8E#TRPBF | Pin-compatible 65V, 0.5A boost/SEPIC/inverting converter; identical pinout and FBX architecture; same MS8E package. | Shares identical topology support and UVLO/soft-start features but lacks SYNC capability and has fixed 1.2MHz fOSC. | Choose LT3580EMS8E#TRPBF only if synchronization is unnecessary and fixed-frequency operation is acceptable. |
Compared with LT3580EMS8E#TRPBF, LT8570EMS8E#TRPBF adds external clock synchronization and adjustable frequency range (200kHz–1.5MHz), enabling tighter EMI control and flexible power supply coordination; versus LTC3873EMS8E#TRPBF, it integrates the power switch and supports non-buck topologies, reducing solution size and design complexity for bias supply generation.
Availability
LT8570EMS8E#TRPBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, VFD display modules, and DSL modem power systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LT8570EMS8E#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 and maintains full product support, documentation, and manufacturing continuity for the LT® series.
The LT8570 product line was designed specifically for compact, high-voltage bias supply generation in display, telecom, and portable instrumentation applications where topology flexibility and integrated protection features are critical.
FAQ
What topology configurations does the LT8570EMS8E#TRPBF support?
The LT8570EMS8E#TRPBF supports three distinct DC/DC configurations: boost (step-up), SEPIC (input can be above, below, or equal to output), and dual-inductor inverting (negative output). This is enabled by its dual-reference FBX pin (1.204V for noninverting, 3mV for inverting) and internal current-mode control architecture. No external component changes beyond feedback resistor and inductor/diode placement are needed to switch between topologies. The LT8570EMS8E#TRPBF datasheet provides complete schematic examples for each mode.
What is the maximum achievable output current using the LT8570EMS8E#TRPBF in boost configuration?
The LT8570EMS8E#TRPBF delivers up to approximately 125mA at 12V output from a 5V input (as shown in Typical Application TA01b), constrained by its 0.5A switch current limit, duty cycle limits (max 85% at 200kHz), and thermal dissipation in the MS8E package. Output current scales inversely with VOUT/VIN ratio and decreases at higher frequencies due to reduced on-time. For sustained 150mA+ loads, thermal evaluation with copper pour and airflow is recommended. The LT8570EMS8E#TRPBF is optimized for bias supply rather than high-current power rails.
How is undervoltage lockout (UVLO) programmed on the LT8570EMS8E#TRPBF?
UVLO is programmed using a resistor divider from VIN to GND, with the midpoint connected to the SHDN pin. The LT8570EMS8E#TRPBF activates when SHDN rises above 1.40V and shuts down when SHDN falls below 1.21V (40mV hysteresis). For example, to set turn-on at 8V, use R1 = 499kΩ (VIN to SHDN) and R2 = 100kΩ (SHDN to GND), yielding 1.34V at SHDN at 8V input. This eliminates need for external supervisors. The LT8570EMS8E#TRPBF's high-gain SHDN pin tolerates slow-ramping inputs common in battery-powered systems.
Can the LT8570EMS8E#TRPBF synchronize to an external clock, and what are the signal requirements?
Yes, the LT8570EMS8E#TRPBF synchronizes via its SYNC pin (Pin 8). The external clock must have a logic-high level ≥1.3V and logic-low level ≤0.4V, with duty cycle between 35% and 65%. The recommended minimum SYNC frequency is 75% of the internal oscillator frequency (e.g., ≥1.125MHz for 1.5MHz fOSC). Driving SYNC below 0.4V reverts to free-running mode. This capability allows noise-sensitive systems like GPS receivers to avoid harmonic interference - a key advantage of the LT8570EMS8E#TRPBF over fixed-frequency alternatives.
What package and thermal characteristics apply to the LT8570EMS8E#TRPBF?
The LT8570EMS8E#TRPBF uses the 8-lead plastic MSOP (MS8E) package with exposed thermal pad (Pin 9 = GND). Its junction-to-ambient thermal resistance (θJA) is 35–40°C/W depending on PCB copper area and airflow. The exposed pad must be soldered to a solid GND plane for optimal thermal and electrical performance. Unlike DFN variants, the MS8E package offers easier manual assembly and rework. Derating is required above 125°C ambient; full specifications are guaranteed from –40°C to 125°C junction temperature. The LT8570EMS8E#TRPBF's thermal design enables reliable operation in enclosed display enclosures without forced cooling.
LT8570EMS8E#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
LT8570EMS8E#TRPBF FAQ
1.How can I place an order for LT8570EMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8570EMS8E#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 LT8570EMS8E#TRPBF reliable?
The price and inventory of LT8570EMS8E#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8570EMS8E#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8570EMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8570EMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8570EMS8E#TRPBF?
LT8570EMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8570EMS8E#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 LT8570EMS8E#TRPBF?
For technical support, including LT8570EMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8570EMS8E#TRPBF requirements.
6.How does Aetrix verify that LT8570EMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8570EMS8E#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 LT8570EMS8E#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8570EMS8E#TRPBF?
All LT8570EMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8570EMS8E#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 LT8570EMS8E#TRPBF part is unused and in its original packaging.
Return procedure for LT8570EMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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