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Analog Devices Inc. LTC1430ACS8#TRPBF
- Part No.:
- LTC1430ACS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1430ACS8#TRPBF.pdf
- Description:
- IC REG CTRLR INTEL 1OUT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,485
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Product details
Overview
LTC1430ACS8#TRPBF from Analog Devices (formerly Linear Technology) is a high-power synchronous step-down switching regulator controller optimized for 5V-to-3.3V conversion in CPU power supplies. It features ±1% output regulation over line, load, and temperature, 93.5% maximum duty cycle, 350µA quiescent current, and drives external N-channel MOSFETs without requiring a sense resistor. It is used in Pentium II and AMD-K6 microprocessor power delivery.
For engineers reviewing the LTC1430ACS8#TRPBF datasheet, LTC1430ACS8#TRPBF pinout, LTC1430ACS8#TRPBF application, or LTC1430ACS8#TRPBF equivalent, key selection criteria include its 8-lead SO package, absence of internal current limit/soft start/frequency adjustability (vs. 16-lead variants), fixed 3.3V output option, and compatibility with logic-level MOSFETs in low-input-voltage systems.
Technical Context
The LTC1430ACS8#TRPBF implements a voltage-mode PWM control architecture with a fixed 200kHz oscillator (adjustable only in 16-lead versions). Its feedback loop uses an internal 1.265V reference and transconductance amplifier (gmV = 350–650 µmho) to regulate output via COMP pin compensation. Unlike the 16-lead LTC1430A, this 8-lead variant lacks IFB, IMAX, SS, FREQSET, and separate PVCC2 pins - disabling current sensing, soft start, and frequency tuning.
It employs dual N-channel gate drivers (G1, G2) with non-overlap timing (25–250 ns), 80–250 ns rise/fall times, and 10,000pF gate drive capability. VCC and PVCC2 are internally tied at Pin 7, requiring ≥10µF bypassing; PGND and GND are internally shorted at Pin 3. The device operates from 0°C to 70°C (LTC1430AC grade) with 150°C max junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Synchronous buck controller - enables >95% efficiency by replacing freewheeling diode with lower-RDS(on) N-MOSFET Q2. |
| Output Voltage | Fixed 3.3V (via internal divider) or adjustable (via external resistor on FB) - supports dual-voltage logic board local regulation. |
| Max Duty Cycle | 93.5% typical - allows 3.3V output from 5V input with margin for dropout and ripple. |
| Quiescent Current | 350µA typical (1µA in shutdown) - enables high light-load efficiency in 1A–50A converter designs. |
| Reference Accuracy | ±1% over line/load/temp - ensures stable 3.3V rail for Pentium II/AMD-K6 core logic under dynamic load. |
| Oscillator Freq | 200kHz nominal (140–260kHz over temp) - balances EMI, inductor size, and MOSFET switching loss. |
| Operating Temp | 0°C to 70°C - qualified for commercial-grade embedded computing and industrial control applications. |
Pinout & Package
Package: 8-lead plastic SO (SOIC-8), 150°C/W thermal resistance, JEDEC MS-012AC compliant. Pin 1 marked with dot; pin count clockwise from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G1 | Upper MOSFET gate driver output | Drives Q1 gate from PVCC1 to PGND; requires charge-pump or auxiliary supply ≥PVCC + VGS(ON). |
| PVCC1 | Power supply for G1 driver | Must be ≥13V max; supplies high-current gate drive; decoupled separately from PVCC. |
| PGND | Power ground return for both drivers | Low-impedance connection point near Q2 source; internally tied to GND in S8 package. |
| GND | Signal ground for internal circuitry | Internally shorted to PGND at Pin 3; must be star-connected to minimize ground shift errors. |
| SENSE+/FB/SENSE− | Feedback node (3-in-1 pin) | Single pin serves as FB input when SENSE+/− floated; connects to output cap for 3.3V regulation. |
| SHDN | Shutdown enable input | TTL-compatible; <0.8V for >50µs forces shutdown (1µA IQ); >2.4V enables normal operation. |
| COMP | Error amplifier output / PWM comparator input | External RC network here sets loop stability and transient response; critical for 10A load steps. |
| VCC/PVCC2 | Combined supply for logic + lower gate driver | Internally tied pins; requires ≥10µF low-ESR capacitor; supplies G2 and all internal circuits. |
Key Features
| Feature | Design Value |
|---|---|
| All-N-channel MOSFET support | Eliminates costly P-channel upper switch; reduces conduction loss and improves thermal performance in high-current 5V→3.3V rails. |
| No external current-sense resistor | Reduces BOM count and PCB area; avoids power loss and accuracy drift associated with shunt resistors in high-current paths. |
| High-efficiency gate drive | Drives up to 10,000pF gate capacitance - supports paralleled MOSFETs (e.g., dual MTD20N03HL) for >10A output capability. |
| Fast transient response | Enabled by transconductance error amplifier (350–650 µmho) and optimized compensation at COMP - maintains <250mV droop during 5A load steps. |
| Low-quiescent-current shutdown | 1µA shutdown current enables system-level power gating in battery-backed or energy-sensitive applications. |
Applications
| Microprocessor Core Supply | Dual-Voltage Logic Board Regulation |
|---|---|
Use Scenario: Powering Pentium II or AMD-K6 CPU cores requiring tightly regulated 3.3V at up to 10A with fast load transients. IC Role / Device Role / Timing Role: Primary step-down controller managing synchronous buck topology with charge-pumped gate drive for Q1 and direct PVCC2 drive for Q2. Use Value: Delivers ±1% regulation and >95% efficiency across full load range while eliminating external sense resistor and supporting logic-level MOSFETs. | Use Scenario: Local regulation on mixed-voltage PCBs where 5V system bus powers 3.3V I/O or memory interfaces. IC Role / Device Role / Timing Role: Standalone buck controller providing isolated, low-noise 3.3V rail decoupled from main system supply. Use Value: Enables compact, high-density layout with minimal external components - only inductor, caps, and two MOSFETs required. |
| Battery-Powered High-Current System | Reactive Load Termination Supply |
Use Scenario: Regulating 3.3V from a 5V battery pack in portable test equipment or industrial handheld devices. IC Role / Device Role / Timing Role: Efficient DC-DC controller minimizing self-heating and extending runtime via 350µA quiescent current and synchronous rectification. Use Value: Achieves >90% efficiency from 1A to 50A output, reducing thermal stress and enabling smaller heatsinks or fanless design. | Use Scenario: GTL (Gunning Transceiver Logic) termination supply that must sink and source current dynamically during signal transitions. IC Role / Device Role / Timing Role: Synchronous buck controller whose bidirectional lower switch (Q2) enables active current sinking without external circuitry. Use Value: Maintains regulation during reverse current flow - critical for high-speed logic termination where output can feed back into regulator. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3830EDHC#TRPBF | Pin-compatible upgrade with integrated current sense, soft-start, adjustable frequency (50kHz–900kHz), and enhanced protection features. | Supports higher current (>60A), wider VIN range (2.5V–38V), and modern CPU/GPU power requirements. | Select for new designs requiring improved integration, robustness, and scalability beyond LTC1430A capabilities. |
| TPS54620RGYT | 6-V to 17-V input, 2-A integrated FET buck converter (not controller); no external MOSFET support; fixed 3.3V or adjustable output. | Targeted at space-constrained, medium-current (<6A) applications where integration outweighs flexibility. | Choose only if external MOSFET drive, >6A output, or 5V input optimization are not required. |
Compared with LTC1430ACS8#TRPBF, LTC3830EDHC#TRPBF adds current sensing and programmability but requires layout changes; TPS54620RGYT integrates power stages but sacrifices scalability and 5V-specific optimization - making LTC1430ACS8#TRPBF optimal for legacy 5V-to-3.3V high-current controller implementations.
Availability
LTC1430ACS8#TRPBF is available at Aetrix Electronics and suitable for microprocessor core supplies, dual-voltage logic board regulation, and battery-powered high-current systems requiring stable component supply and long-term obsolescence management.
Supply support for LTC1430ACS8#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1430A product line was designed specifically for high-efficiency, high-current synchronous buck conversion in computing and embedded systems - emphasizing precision regulation, MOSFET drive capability, and minimal external component count.
FAQ
What is the maximum output current supported by the LTC1430ACS8#TRPBF?
The LTC1430ACS8#TRPBF is rated to support converters delivering over 10A output current, as confirmed in its datasheet's "Typical 5V to 3.3V, 10A Application" schematic and efficiency curves. Actual achievable current depends on external MOSFET selection (e.g., parallel MTD20N03HL devices), inductor rating, thermal design, and PCB copper area. The controller itself does not limit current - it relies on external component sizing.
Does the LTC1430ACS8#TRPBF include internal current limiting?
No, the LTC1430ACS8#TRPBF does not include internal current limiting. This feature is exclusive to the 16-lead LTC1430A variants (e.g., LTC1430ACGN), which provide IFB, IMAX, and SS pins. The 8-lead S8 package omits these pins and associated circuitry - current protection must be implemented externally via MOSFET SOA derating or discrete overcurrent detection.
Can the LTC1430ACS8#TRPBF be used with a 3.3V input supply?
Yes, the LTC1430ACS8#TRPBF can operate from a 3.3V input, but with constraints: PVCC1 must still be ≥5V (e.g., generated via charge pump) to fully enhance the upper N-MOSFET gate, and VCC/PVCC2 must be ≥4V per absolute maximum ratings. The datasheet confirms 3.3V input operation in "3.3V Input Supply Operation" section, specifying use of logic-level MOSFETs and careful gate drive design.
What is the purpose of the SENSE+/FB/SENSE− pin on the LTC1430ACS8#TRPBF?
The SENSE+/FB/SENSE− pin on the LTC1430ACS8#TRPBF is a 3-in-1 feedback node. When SENSE+ connects to the output capacitor's positive terminal and SENSE− to GND, the internal 1.265V reference and resistor divider set a fixed 3.3V output. If SENSE+ and SENSE− are left floating, FB becomes the sole feedback input for external resistor-divider configurations - enabling adjustable output voltages.
How does the LTC1430ACS8#TRPBF achieve high efficiency without a sense resistor?
The LTC1430ACS8#TRPBF achieves high efficiency without a sense resistor by using synchronous rectification (replacing the diode with Q2) and optimizing gate drive to minimize switching losses. While current sensing is omitted in the S8 variant, efficiency gains come from low RDS(on) MOSFET conduction, 93.5% duty cycle headroom, and 350µA quiescent current - enabling >95% peak efficiency in 5V-to-3.3V/10A designs per the datasheet's Typical Performance Characteristics.
LTC1430ACS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Controller, Intel Pentium® II, AMD-K6®
- Voltage - Input:
- 4V ~ 8V
- Number of Outputs:
- 1
- Voltage - Output:
- 3.3V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1430ACS8#TRPBF FAQ
1.How can I place an order for LTC1430ACS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1430ACS8#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 LTC1430ACS8#TRPBF reliable?
The price and inventory of LTC1430ACS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1430ACS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1430ACS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1430ACS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1430ACS8#TRPBF?
LTC1430ACS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1430ACS8#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 LTC1430ACS8#TRPBF?
For technical support, including LTC1430ACS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1430ACS8#TRPBF requirements.
6.How does Aetrix verify that LTC1430ACS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1430ACS8#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 LTC1430ACS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1430ACS8#TRPBF?
All LTC1430ACS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1430ACS8#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 LTC1430ACS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1430ACS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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