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Analog Devices Inc. LTC1430ACS8
- Part No.:
- LTC1430ACS8
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1430ACS8.pdf
- Description:
- IC REG CTRLR INTEL 1OUT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:121
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Product details
Overview
LTC1430ACS8 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 and logic supply applications. It features an internal 1.265V reference, ±1% output regulation over line/load/temperature, 93.5% maximum duty cycle, and drives external N-channel MOSFETs without requiring a P-channel device or external current-sense resistor.
For engineers reviewing the LTC1430ACS8 datasheet, LTC1430ACS8 pinout, LTC1430ACS8 application, or LTC1430ACS8 equivalent, this controller delivers >90% efficiency at 1A–50A output, supports adjustable oscillator frequency (100–500kHz), integrates soft-start control via external capacitor, and targets Pentium II/AMD-K6 power delivery where low-voltage, high-current regulation with fast transient response is critical.
Technical Context
The LTC1430ACS8 implements a voltage-mode PWM control architecture with a fixed-frequency oscillator (200kHz typical, adjustable via FREQSET pin) and dual N-channel gate drivers (G1, G2) operating with independent PVCC1/PVCC2 supplies. Its feedback loop uses internal transconductance amplifier (gmV = 350–650 µmho) referenced to 1.265V, with MIN/MAX comparators providing ±3% fast over/under-voltage protection.
This 8-lead SOIC variant lacks current-limit sensing (IFB/IMAX pins disabled), internal soft-start circuitry, and frequency adjustability - distinguishing it from the 16-lead GN/SO versions. It relies on external compensation at COMP and requires RC filtering between PVCC and VCC/PVCC2 to stabilize gate drive under high dI/dt conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Regulation Accuracy | ±1% over line, load, and temperature - enables stable 3.3V rail for microprocessor core logic without post-regulation. |
| Max Duty Cycle | 93.5% typical - allows 3.3V output from 5V input with margin for dropout and ripple. |
| Quiescent Current | 350 µA typical, 1 µA in shutdown - preserves efficiency in light-load and standby modes. |
| Oscillator Frequency | 200 kHz typical (fixed, non-adjustable in S8 package) - balances EMI, size, and efficiency for 5V-to-3.3V converters. |
| Feedback Reference Voltage | 1.265 V ±10 mV - sets precise 3.3V output when used with internal divider (SENSE+/SENSE−). |
| Driver Rise/Fall Time | 80–250 ns - supports fast switching of MOSFETs with ≤10,000 pF gate capacitance. |
| Operating Temperature Range | 0°C to 70°C (AC grade) - qualified for commercial embedded and computing power systems. |
Pinout & Package
Package: 8-Lead Plastic SOIC (SO-8), 150°C/W junction-to-ambient thermal resistance, JEDEC MS-012AC compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| G1 | Upper MOSFET Gate Driver Output | Drives gate of high-side N-channel FET (Q1); swings from PGND to PVCC1; requires charge-pump or auxiliary supply ≥PVCC + VGS(ON). |
| PVCC1 | High-Side Gate Drive Supply Input | Power source for G1 driver; must be ≥PVCC + VGS(ON) of Q1; max 13V absolute rating. |
| PGND | Power Ground Return | Common return path for both gate drivers; must connect to low-impedance ground near Q2 source. |
| GND | Signal Ground Reference | Return for internal analog circuits; tied internally to PGND at Pin 3 in S8 package to minimize ground shift errors. |
| SENSE+, FB, SENSE− | Feedback Node Interface | Three-pin interface for internal 3.3V divider (SENSE+ to VOUT, SENSE− to GND, FB floating) or external resistor network. |
| SHDN | Shutdown Control Input | TTL-compatible enable/disable; <0.8V for >50 µs forces shutdown (IQ ≤10 µA); >2.4V enables operation. |
| SS | Soft-Start Timing Node | Connect external capacitor to GND to control startup ramp rate and limit inrush; required for controlled turn-on. |
| VCC/PVCC2 | Combined Logic & Low-Side Gate Supply | Single pin supplies internal circuitry and G2 driver; requires RC filter (e.g., 100Ω + 4.7µF) due to shared current paths. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-channel architecture | Eliminates external Schottky diode and associated conduction loss - enables >95% efficiency at 10A with proper MOSFET selection. |
| Integrated 1.265V precision reference | Trimmed to ±0.5% at 25°C and ±1% over full temp/load/line range - reduces need for external trimming in production. |
| Fixed 200kHz oscillator (S8 package) | Provides consistent switching frequency without external components - simplifies EMI filtering and inductor selection. |
| Low 350µA quiescent current | Enables >90% efficiency down to ~1A load - critical for battery-backed or energy-sensitive computing power rails. |
| 93.5% maximum duty cycle | Supports 3.3V output from 5V input with headroom for voltage drop across PCB traces and MOSFET RDS(ON). |
Applications
| Microprocessor Core Supply | Dual-Voltage Logic Board Regulation |
|---|---|
Use Scenario: Powering Pentium II or AMD-K6 microprocessors requiring tightly regulated 3.3V at up to 10A with fast load-step response. IC Role / Device Role / Timing Role: Primary step-down controller managing high-side/low-side N-MOSFET switching, feedback regulation, and soft-start sequencing. Use Value: Delivers ±1% output accuracy and 93.5% duty cycle to sustain 3.3V under 5V input constraints while maintaining >90% efficiency across 1–10A loads. |
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 generating clean, low-noise 3.3V rail adjacent to noise-sensitive logic devices. Use Value: Fixed 200kHz operation minimizes interference with data buses; low 350µA quiescent current avoids loading auxiliary 5V supplies during idle states. |
| High-Current Battery-Powered Systems | Industrial Embedded Computing Power |
Use Scenario: Regulating 3.3V for FPGA or DSP subsystems in portable test equipment powered by 5V Li-ion packs. IC Role / Device Role / Timing Role: High-efficiency DC-DC controller enabling extended runtime via >90% conversion efficiency at mid-load currents. Use Value: Shutdown mode draws only 1µA - preserves battery life during sleep; SO-8 package supports compact, thermally manageable layouts. |
Use Scenario: Powering fanless industrial PCs or edge controllers requiring reliable 3.3V supply in 0°C–70°C ambient environments. IC Role / Device Role / Timing Role: Commercial-grade controller with validated thermal performance (θJA = 150°C/W) and robust 150°C junction rating. Use Value: AC-grade qualification ensures long-term stability in uncooled enclosures; integrated MIN/MAX comparators provide fault immunity against rail collapse or overshoot. |
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 internal gate drivers, adjustable frequency (50–850kHz), current-mode control, and current-sense amplifier - but requires external sense resistor. | Supports current-limit functionality and better transient response; suited for new designs needing programmability and tighter current monitoring. | Select LTC3703-5 when current limiting, wider frequency range, or current-mode stability are required - not a pin-compatible replacement for LTC1430ACS8. |
| LM5116 | Wide-input (6–100V), external N-MOSFET controller with adjustable frequency (50–750kHz), built-in bootstrap diode, and enhanced protection features (UVLO, OTP, OVP). | Designed for higher input voltages and harsher environments; lacks internal 3.3V reference - requires external feedback network. | Choose LM5116 for industrial or automotive inputs >12V; not suitable for 5V-only 3.3V regulation without redesign. |
Compared with LTC1430ACS8, LTC3703-5 adds current sensing and frequency flexibility at the cost of added BOM complexity, while LM5116 trades 5V optimization for wide-input ruggedness - neither offers drop-in compatibility, but both address adjacent design requirements where LTC1430ACS8's fixed-frequency, low-component-count approach is insufficient.
Availability
LTC1430ACS8 is available at Aetrix Electronics and suitable for microprocessor core supplies, dual-voltage logic board regulation, and high-current battery-powered systems requiring stable component supply with commercial-grade temperature performance and proven reliability in computing infrastructure.
Supply support for LTC1430ACS8 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 precision instrumentation, communications, and power conversion markets.
The LTC1430A product line was designed specifically for high-efficiency, high-current synchronous buck regulation in computing and logic power applications - emphasizing minimal external components, tight output regulation, and robust gate drive capability for N-channel MOSFETs.
FAQ
What is the maximum output current supported by the LTC1430ACS8?
The LTC1430ACS8 is a controller-not a complete regulator-and supports output currents exceeding 10A depending on external MOSFET selection, inductor sizing, and thermal design. In typical 5V-to-3.3V applications with Motorola MTD20N03HL MOSFETs and 2.7µH inductor, the LTC1430ACS8 reliably delivers 10A with >90% efficiency. Higher currents (up to 50A) are achievable with paralleled FETs and appropriate layout, but require careful attention to gate drive strength and thermal management.
Does the LTC1430ACS8 include current-limit protection?
No, the LTC1430ACS8 (8-lead SOIC version) does not include current-limit sensing or protection circuitry. Unlike the 16-lead LTC1430A variants, it lacks IFB and IMAX pins and omits the ILIM amplifier. Current limiting must be implemented externally-e.g., via sense-resistor-based comparator circuits-or omitted entirely if system-level protection suffices. This simplifies the BOM but shifts fault-protection responsibility to the designer.
Can the LTC1430ACS8 operate with a 3.3V input supply?
The LTC1430ACS8 is not rated for 3.3V input operation. Its PVCC1 and PVCC2 pins require minimum 3V, but the controller is optimized for 5V input-to-3.3V output conversion. For 3.3V input, gate drive for the high-side MOSFET (Q1) becomes marginal: PVCC1 must exceed PVCC by at least VGS(ON), which is impractical at 3.3V. Use the LTC3703 or LTC3830 for true 3.3V-input buck controller applications.
What is the purpose of the RC filter between PVCC and VCC/PVCC2 on the LTC1430ACS8?
The RC filter (e.g., 100Ω + 4.7µF) on the VCC/PVCC2 pin of the LTC1430ACS8 isolates the sensitive internal analog circuitry from high-current gate-drive transients drawn by G2. Because the 8-lead package combines logic supply and low-side gate drive on one pin, this filter prevents noise coupling into the error amplifier and oscillator, ensuring stable regulation and preventing false shutdown or oscillation. Skipping it risks erratic behavior under heavy load.
Is the LTC1430ACS8 pin-compatible with the LTC1430ACGN?
No, the LTC1430ACS8 (8-lead SOIC) is not pin-compatible with the LTC1430ACGN (16-lead SSOP). They differ in pin count, pin functions, and feature set: the S8 package merges VCC and PVCC2, omits IFB/IMAX/SS/FREQSET pins, and lacks current-limit and soft-start circuitry. PCB layout, external component count, and control functionality are fundamentally different - direct substitution requires full schematic and layout revision.
LTC1430ACS8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-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:
- 8-SO
LTC1430ACS8 FAQ
1.How can I place an order for LTC1430ACS8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1430ACS8 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 reliable?
The price and inventory of LTC1430ACS8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1430ACS8 is usually 5 days.
3.What payment methods are accepted for LTC1430ACS8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1430ACS8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1430ACS8?
LTC1430ACS8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1430ACS8 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?
For technical support, including LTC1430ACS8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1430ACS8 requirements.
6.How does Aetrix verify that LTC1430ACS8 is sourced from the original manufacturer or authorized distributors?
All LTC1430ACS8 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 meets industry standards.
7.What is the process for return or replacement of LTC1430ACS8?
All LTC1430ACS8 units undergo pre-shipment inspection (PSI). If there is an issue with LTC1430ACS8, 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 part is unused and in its original packaging.
Return procedure for LTC1430ACS8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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