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Analog Devices Inc. LTC1430ACS
- Part No.:
- LTC1430ACS
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1430ACS.pdf
- Description:
- IC REG CTRLR INTEL 1OUT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:215
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Product details
Overview
LTC1430ACS from Analog Devices (formerly Linear Technology) is a high-power synchronous step-down switching regulator controller optimized for 5V-to-3.3V conversion in high-current CPU power supplies. It features ±1% output regulation over line, load, and temperature; 93.5% maximum duty cycle; internal 200kHz PWM oscillator; and dual N-channel MOSFET gate drivers capable of driving up to 10,000pF gate capacitance. It supports >10A output current in Pentium II and AMD-K6 microprocessor power applications.
For engineers reviewing the LTC1430ACS datasheet, LTC1430ACS pinout, LTC1430ACS application, or LTC1430ACS equivalent, this page delivers verified technical context, package-specific pin definitions, real-world efficiency data, confirmed alternative controllers, and supply-chain support details - all grounded in the official Linear Technology LTC1430A datasheet Rev. D and product brief.
Technical Context
The LTC1430ACS implements a voltage-mode PWM control architecture with an internal 1.265V precision reference and transconductance error amplifier (gmV = 350–650 µmho). Its feedback loop uses SENSE+/SENSE−/FB pins to monitor output voltage directly at the capacitor terminals, enabling ±1% regulation across 0°C to 70°C ambient.
It integrates two independent high-side (G1) and low-side (G2) N-channel gate drivers with non-overlap timing (25–250 ns), fixed-frequency oscillator (100–500 kHz via FREQSET), and shutdown logic (TTL-compatible SHDN input, 1µA quiescent current). The 8-lead SO package omits current-limit sensing (IFB/IMAX), soft-start (SS), and frequency adjustability - distinguishing it from the 16-lead GN variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Regulation Accuracy | ±1% over line, load, and temperature - ensures stable 3.3V rail for Pentium II/K6 core logic under dynamic load steps. |
| Max Duty Cycle | 93.5% typical - enables 3.3V output from 5V input without external boost, critical for low-voltage CPU core supplies. |
| Oscillator Frequency | 200 kHz nominal (100–500 kHz adjustable) - balances EMI, inductor size, and transient response in high-current buck designs. |
| Quiescent Current | 350 µA typical (1 µA in shutdown) - maintains >90% efficiency from 1A to >50A output, minimizing no-load power loss. |
| Gate Drive Capability | Drives external FETs with ≤10,000 pF total gate capacitance - supports paralleled MOSFETs (e.g., dual MTD20N03HL) for >10A output. |
| Operating Temperature | 0°C to 70°C (Commercial grade) - validated for desktop motherboard and industrial embedded power applications. |
| Package Thermal Resistance | θJA = 150°C/W (8-lead SO) - requires minimal PCB copper area for thermal management at 10A output. |
Pinout & Package
Package: 8-Lead Plastic SO (SO-8), surface-mount, JEDEC MS-012AC compliant. Pin 1 marked by notch or dot; body dimensions 4.9 mm × 3.9 mm × 1.75 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G1 | High-Side Gate Driver Output | Drives gate of upper N-MOSFET (Q1); swings from PGND to PVCC1; non-overlapping with G2 to prevent shoot-through. |
| PVCC1 | High-Side Driver Power Supply | Must exceed PVCC + VGS(ON) of Q1; typically 12V when PVCC = 5V; supports charge-pump or auxiliary supply. |
| PGND | Power Ground Return | Low-impedance return path for both G1 and G2 drivers; must connect near Q2 source to minimize noise coupling. |
| GND | Signal Ground Reference | Return for internal analog circuitry; tied internally to PGND at Pin 3 in SO-8; requires star-point connection to avoid ground bounce. |
| SENSE+, FB, SENSE− | Feedback Node Interface | Internal resistor divider sets 3.3V output: SENSE+ → VOUT+, SENSE− → GND, FB left floating; external divider connects to FB only. |
| SHDN | Shutdown Control Input | TTL-compatible active-low enable; <50 µs low pulse forces G1/G2 low and reduces ICC to ≤10 µA. |
| VCC/PVCC2 | Combined Logic + Low-Side Driver Supply | Single pin powers internal circuits and G2 driver; requires ≥10 µF bypass to GND; RC filter recommended from PVCC if unregulated. |
| COMP | Error Amplifier Output / Loop Compensation | Connect external RC network (e.g., 7.5kΩ + 4700pF) to stabilize feedback loop and optimize transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-MOSFET Architecture | Eliminates external Schottky diode; reduces conduction loss to I²×RDS(ON), enabling >95% efficiency at 10A. |
| Integrated 1.265V Precision Reference | Trimmed to ±0.5% at 25°C; combined with transconductance amplifier enables ±1% system-level output regulation. |
| Fixed-Frequency PWM with Adjustable Range | 200 kHz base frequency; externally programmable from 100 kHz to >500 kHz via FREQSET resistor - simplifies EMI filtering and inductor selection. |
| High-Efficiency Gate Drivers | G1/G2 deliver fast rise/fall times (80–250 ns) and drive ≥10,000 pF - supports paralleled MOSFETs without external buffers. |
| Low Quiescent Current Operation | 350 µA typical supply current enables >90% efficiency down to light loads - critical for energy-sensitive computing platforms. |
Applications
| Pentium II / AMD-K6 Microprocessor Core Supply | Local Regulation on Dual-Voltage Logic Boards |
|---|---|
Use Scenario: Delivering tightly regulated 3.3V/10A to Intel Pentium II or AMD-K6 CPU cores during burst-mode instruction execution. IC Role / Device Role / Timing Role: Primary step-down controller managing synchronous buck topology with dual N-MOSFETs and output capacitor ESR-based transient response. Use Value: 93.5% max duty cycle enables direct 5V-to-3.3V conversion; ±1% regulation prevents core voltage droop during 5A load steps. |
Use Scenario: Providing isolated 3.3V rail for I/O buffers and memory interfaces on mixed-voltage (5V/3.3V) PCBs. IC Role / Device Role / Timing Role: Local DC-DC controller placed near load to minimize IR drop and improve PSRR at high frequencies. Use Value: 200 kHz fixed-frequency operation reduces layout sensitivity; SO-8 package allows compact placement adjacent to BGA logic devices. |
| High-Current Battery-Powered Systems | Reactive Load Termination Supplies (e.g., GTL) |
Use Scenario: Regulating 3.3V from a 5V Li-ion battery pack in portable test equipment requiring >10A peak current. IC Role / Device Role / Timing Role: High-efficiency buck controller operating in continuous conduction mode with low-RDS(ON) MOSFETs. Use Value: 350 µA quiescent current extends battery runtime; synchronous architecture avoids diode VF loss, improving thermal performance. |
Use Scenario: Supplying bidirectional current to GTL (Gunning Transceiver Logic) bus terminators that sink and source current dynamically. IC Role / Device Role / Timing Role: Synchronous buck controller exploiting bidirectional conduction capability of low-side N-MOSFET (Q2). Use Value: Ability to sink current during bus transitions eliminates need for separate termination regulators; maintains regulation under reverse current flow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3703-5 | Higher integration: includes MOSFET drivers, 5V bias LDO, and current-mode control; supports 0.6V–5V output; 850 kHz max fSW. | Designed for lower-output-voltage, higher-frequency applications (e.g., 1.2V/20A CPU cores); requires different compensation and layout. | Select LTC3703-5 for new designs needing tighter VOUT tolerance (<±0.5%), faster transient response, or integrated bias generation. |
| TPS40200 | Voltage-mode controller with external COMP, 100–1000 kHz fSW range, 95% max duty cycle; TI's 8-pin SO package; 2.5V reference. | Broader input range (4.5–52V); less precise reference (±1.5%); no integrated soft-start or MIN/MAX comparators. | Choose TPS40200 when operating from wide-input industrial supplies or when cost sensitivity outweighs ±1% regulation requirement. |
Compared with LTC1430ACS, LTC3703-5 offers superior accuracy and speed but targets sub-2V outputs, while TPS40200 trades regulation precision for wider VIN range and higher fSW flexibility - making LTC1430ACS optimal for legacy 5V-to-3.3V Pentium/K6 power where ±1% stability and SO-8 footprint are mandatory.
Availability
LTC1430ACS is available at Aetrix Electronics and suitable for Pentium II power delivery, AMD-K6 core regulation, and local 3.3V board-level conversion requiring stable component supply across multi-year production cycles.
Supply support for LTC1430ACS 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 ICs, serving aerospace, industrial, and computing markets with precision, reliability, and long-lifecycle support.
The LTC1430A belongs to Linear's high-current synchronous buck controller product line, designed specifically for efficient, low-voltage CPU and logic core power in desktop, server, and embedded computing platforms.
FAQ
What is the maximum output current supported by the LTC1430ACS?
The LTC1430ACS is rated for >10A output current in typical 5V-to-3.3V applications, as validated in the datasheet's Figure 1 reference design using paralleled MTD20N03HL MOSFETs and 2.7µH/15A inductor. Actual current capability depends on external component selection, PCB thermal design, and ambient temperature - with proper layout, designs exceeding 15A have been demonstrated.
Does the LTC1430ACS include current limit protection?
No - the LTC1430ACS (8-lead SO package) does not include current limit sensing. The IFB, IMAX, and SS pins are absent in this variant. Current limit functionality is exclusive to the 16-lead LTC1430ACGN/LTC1430AIGN packages, which use the upper MOSFET's RDS(ON) for sensing. For overcurrent protection with LTC1430ACS, external circuitry or MOSFET selection with thermal shutdown is required.
Can the LTC1430ACS operate with a 3.3V input supply?
Yes - the LTC1430ACS supports 3.3V input operation when configured with 5V at VCC/PVCC2 and 3.3V at PVCC, as documented in the Applications Information section. In this mode, PVCC1 must be generated via charge pump (e.g., doubler in Figure 5) to ensure sufficient gate drive for the high-side MOSFET, and logic-level FETs are recommended for reliable enhancement.
What is the purpose of the SENSE+, SENSE−, and FB pins on the LTC1430ACS?
These three pins implement the internal feedback divider for fixed 3.3V output: SENSE+ connects to VOUT+, SENSE− to GND, and FB remains floating. When using an external resistor divider for non-standard output voltages, SENSE+ and SENSE− are left unconnected, and the divider midpoint connects to FB - enabling flexible VOUT programming while maintaining the same ±1% regulation accuracy.
How does the LTC1430ACS achieve high efficiency at light loads?
The LTC1430ACS achieves >90% efficiency from 1A to >50A output primarily through its 350 µA typical quiescent current and synchronous N-MOSFET architecture, which replaces lossy Schottky diodes with low-RDS(ON) FETs. At light loads, low ICC minimizes fixed losses, while the fixed 200 kHz switching frequency avoids variable-frequency inefficiencies seen in hysteretic controllers.
LTC1430ACS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 16-SO
LTC1430ACS FAQ
1.How can I place an order for LTC1430ACS through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1430ACS 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 LTC1430ACS reliable?
The price and inventory of LTC1430ACS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1430ACS is usually 5 days.
3.What payment methods are accepted for LTC1430ACS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1430ACS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1430ACS?
LTC1430ACS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1430ACS 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 LTC1430ACS?
For technical support, including LTC1430ACS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1430ACS requirements.
6.How does Aetrix verify that LTC1430ACS is sourced from the original manufacturer or authorized distributors?
All LTC1430ACS 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 LTC1430ACS meets industry standards.
7.What is the process for return or replacement of LTC1430ACS?
All LTC1430ACS units undergo pre-shipment inspection (PSI). If there is an issue with LTC1430ACS, 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 LTC1430ACS part is unused and in its original packaging.
Return procedure for LTC1430ACS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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