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Analog Devices Inc. LTC1430CS8#TRPBF
- Part No.:
- LTC1430CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1430CS8#TRPBF.pdf
- Description:
- IC REG CTRLR INTEL 1OUT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,933
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Product details
Overview
LTC1430CS8#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 high-current applications. It features dual N-channel MOSFET gate drivers, ±1% output regulation over line/load/temperature, 200kHz fixed-frequency PWM operation, and current sensing via upper FET RDS(ON) - eliminating external sense resistors. It supports up to 10A output in typical designs and targets Pentium® microprocessor power supplies.
For engineers reviewing the LTC1430CS8#TRPBF datasheet, LTC1430CS8#TRPBF pinout, LTC1430CS8#TRPBF application, or LTC1430CS8#TRPBF equivalent, key selection considerations include its 8-lead SOIC package, absence of internal current limit/soft-start/frequency adjustability (vs. 16-lead variants), 350µA quiescent current, ±1% regulation accuracy, and requirement for external charge-pump gate drive for the high-side N-MOSFET.
Technical Context
The LTC1430CS8#TRPBF implements a voltage-mode PWM control architecture with an internal 1.265V precision reference and transconductance error amplifier (650 µ℧ typ). Its feedback loop compares SENSE+ and SENSE– voltages against this reference to generate duty-cycle-modulated gate drive signals G1 and G2, with MIN/MAX comparators providing fast over/under-voltage protection at ±3% thresholds.
Unlike the 16-lead LTC1430 variants, the LTC1430CS8#TRPBF lacks IFB, IMAX, FREQSET, SS, and SENSE+/- pins - confirming it omits current-limit sensing, adjustable frequency, and internal soft-start. Its gate drivers deliver 80–250ns rise/fall times and support up to 10,000pF gate capacitance, with non-overlap timing (25–250ns) preventing shoot-through in synchronous buck topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Synchronous step-down (buck) controller - requires external high- and low-side N-MOSFETs. |
| Output Voltage | Fixed 3.3V via internal resistor divider - SENSE+ and SENSE– connect directly to output capacitor terminals. |
| Regulation Accuracy | ±1% over line, load, and temperature - enables stable 3.3V supply for Pentium® and dual-voltage logic without trimming. |
| Oscillator Frequency | 200kHz fixed (140–260kHz over temp) - determines inductor size and output ripple; no external adjustment possible on CS8 variant. |
| Quiescent Current | 350µA typical (1µA in shutdown) - supports >90% efficiency at 1A–50A output and extends battery life in standby modes. |
| Driver Output Capability | Drives up to 10,000pF gate capacitance - accommodates paralleled MOSFETs for >10A designs without external buffers. |
| Max Duty Cycle | 96% - enables operation down to ~3.3V output from 5V input with margin for dropout and losses. |
Pinout & Package
Package: 8-lead plastic SOIC (S8), 1.27mm pitch, JEDEC MS-012AC. Thermal resistance θJA = 110°C/W. Pin 3 internally ties PGND and GND - requires single-point grounding at device for minimal regulation error.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G1 (Pin 1) | High-side gate driver output | Swings from PVCC1 to PGND; drives gate of upper N-MOSFET (M1); must be level-shifted above PVCC using charge pump. |
| PVCC1 (Pin 2) | High-side driver power supply | Must exceed PVCC by ≥VGS(ON) of M1; typically generated via diode-capacitor charge pump from switching node. |
| PGND/GND (Pin 3) | Power and signal ground return | Single internal connection - tie to low-impedance ground near M2 source to avoid ground bounce in high di/dt paths. |
| FB (Pin 4) | Feedback reference node | Floating in 3.3V fixed-output mode; connects to internal 1.265V reference - no external divider needed. |
| G2 (Pin 5) | Low-side gate driver output | Swings from PVCC2 to PGND; drives gate of lower N-MOSFET (M2); PVCC2 tied to VCC in 8-lead package. |
| VCC/PVCC2 (Pin 6) | Logic supply & low-side driver supply | Supplies internal circuitry and G2; requires 4.7µF bypass capacitor; 8-lead version ties VCC and PVCC2 internally. |
| COMP (Pin 7) | Error amplifier output / PWM input | External RC compensation network here sets loop stability and transient response; critical for 10A load steps. |
| SHDN (Pin 8) | Shutdown enable input | TTL-compatible; <0.8V for >50µs forces shutdown (IQ ≤ 1µA); >2.4V enables normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| All-N-channel MOSFET support | Eliminates costly P-channel high-side switch; reduces conduction loss and board area vs. Pch+Nch solutions. |
| No external current-sense resistor | Uses RDS(ON) of upper MOSFET for current limiting - cuts BOM count and removes power loss in sense path. |
| ±1% output regulation accuracy | Maintains 3.3V within ±33mV across 0°C–70°C, full load range, and input variation - meets Pentium® core voltage tolerance. |
| 350µA quiescent current | Enables >90% efficiency at light loads (1A) and >95% at full load (10A) - critical for energy-sensitive embedded systems. |
| 200kHz fixed-frequency PWM | Ensures predictable EMI profile and allows small, standardized inductors (e.g., 2.8µH) - simplifies EMI filtering design. |
Applications
| Power Supply for Pentium® Microprocessors | High-Current Local Regulation on Dual-Voltage Boards |
|---|---|
Use Scenario: Delivering tightly regulated 3.3V/10A to Intel Pentium® processors in desktop motherboards. IC Role / Device Role / Timing Role: Primary step-down controller managing high-side/low-side N-MOSFET switching, feedback regulation, and fast transient response. Use Value: ±1% regulation ensures CPU stability under dynamic load; 200kHz switching enables compact 2.8µH inductor and low-profile layout. |
Use Scenario: Providing isolated 3.3V rails for I/O and memory on mixed-voltage PCBs with 5V system bus. IC Role / Device Role / Timing Role: Local DC-DC controller converting 5V bus to 3.3V with minimal noise coupling to sensitive analog sections. Use Value: All-N-MOSFET topology and separate PGND/GND reduce ground noise; 350µA IQ minimizes standby power draw. |
| Low-Voltage Battery-Powered Systems | Industrial 5V-to-3.3V Point-of-Load Conversion |
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 enabling >95% conversion efficiency to extend runtime and reduce thermal stress. Use Value: No sense resistor eliminates parasitic loss; 1µA shutdown current preserves battery during idle periods. |
Use Scenario: Generating 3.3V for FPGA I/O banks or industrial sensors from a centralized 5V rail in factory automation controllers. IC Role / Device Role / Timing Role: Robust point-of-load controller with ±1% regulation and fast transient recovery for noisy industrial environments. Use Value: MIN/MAX comparators clamp output to ±3% during load surges - prevents logic upset without sacrificing steady-state accuracy. |
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 |
|---|---|---|---|
| LTC3830EDHC#PBF | Successor IC with integrated current-mode control, programmable frequency (50kHz–900kHz), and true current limit (not RDS(ON)-based). | Supports wider input range (2.75V–38V), higher output current (>30A), and enhanced transient response - suitable for new designs requiring scalability. | Select LTC3830EDHC#PBF for new designs needing adjustable frequency, better current limit accuracy, or broader VIN range; LTC1430CS8#TRPBF remains valid for cost-sensitive 5V→3.3V legacy replacements. |
| TPS40200DGQ | Voltage-mode controller with 1.22V reference, 100kHz–1MHz adjustable frequency, and external current-sense resistor requirement. | Requires sense resistor and external compensation; lacks integrated 3.3V feedback divider - needs more external components than LTC1430CS8#TRPBF. | Choose TPS40200DGQ when frequency flexibility or compatibility with existing TI-based designs outweighs BOM simplicity; LTC1430CS8#TRPBF offers lower component count for fixed 3.3V/200kHz use cases. |
Compared with LTC3830EDHC#PBF and TPS40200DGQ, the LTC1430CS8#TRPBF delivers the lowest component count for fixed 3.3V/200kHz applications due to its internal divider and RDS(ON) current sensing, but trades off frequency adjustability and current limit precision - making it optimal for cost-constrained, volume production of legacy 5V-to-3.3V supplies.
Availability
LTC1430CS8#TRPBF is available at Aetrix Electronics and suitable for Pentium® microprocessor power supplies, dual-voltage logic board regulation, and industrial 5V-to-3.3V point-of-load conversion requiring stable component supply and long-term obsolescence management.
Supply support for LTC1430CS8#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving aerospace, industrial, automotive, and communications markets.
The LTC1430 belongs to Linear's high-efficiency DC-DC controller product line, designed specifically for high-current, low-voltage step-down applications in computing and embedded systems where precision regulation and MOSFET optimization are critical.
FAQ
What is the operating temperature range for the LTC1430CS8#TRPBF?
The LTC1430CS8#TRPBF is rated for commercial temperature operation from 0°C to 70°C. This is confirmed in the Absolute Maximum Ratings table, where "LTC1430C" grade (denoted by 'C' in the part number) specifies this range. The device's thermal resistance θJA is 110°C/W in the 8-lead SOIC package, requiring appropriate board copper area for reliable operation at full load.
Does the LTC1430CS8#TRPBF support adjustable output voltage?
No, the LTC1430CS8#TRPBF does not support adjustable output voltage. It is configured for fixed 3.3V output using an internal resistor divider. The FB pin is left floating, and SENSE+ and SENSE– connect directly to the output capacitor terminals. Unlike the 16-lead LTC1430 variants, the CS8 package omits pins required for external feedback dividers (e.g., dedicated FB input without internal divider).
Why does the LTC1430CS8#TRPBF require a charge pump for PVCC1?
The LTC1430CS8#TRPBF requires a charge pump to generate PVCC1 because its high-side gate driver (G1) must swing above the main input voltage (PVCC) to fully enhance the upper N-channel MOSFET. Since the device lacks integrated high-side level-shifting circuitry, a diode-capacitor charge pump (e.g., 1N4148 + 0.1µF) referenced to the switching node generates ~2×PVCC at PVCC1 - ensuring sufficient VGS for low RDS(ON) conduction.
Can the LTC1430CS8#TRPBF be used in current-limiting applications?
No, the LTC1430CS8#TRPBF does not include current-limit functionality. As explicitly stated in the datasheet's "Theory of Operation" section, current limit sensing (via IFB and IMAX pins) and the associated ILIM amplifier are present only in the 16-lead versions. The CS8 variant lacks these pins and internal circuitry - making it unsuitable for designs requiring overcurrent protection beyond basic thermal shutdown.
What is the maximum recommended output current for the LTC1430CS8#TRPBF?
The LTC1430CS8#TRPBF is validated for up to 10A output current in typical 5V-to-3.3V applications, as shown in the "Typical Application" schematic and efficiency plot (Figure TA02). While the datasheet notes capability "to exceed 10A", sustained operation above 10A requires careful thermal design, low-RDS(ON) MOSFETs (e.g., paralleled MTD20N03HL), and robust PCB copper to manage power dissipation within the 110°C/W θJA limit.
LTC1430CS8#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®
- Voltage - Input:
- 4V ~ 8V
- Number of Outputs:
- 1
- Voltage - Output:
- 3.3V, Adj
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1430CS8#TRPBF FAQ
1.How can I place an order for LTC1430CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1430CS8#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 LTC1430CS8#TRPBF reliable?
The price and inventory of LTC1430CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1430CS8#TRPBF is usually 5 days.
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LTC1430CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1430CS8#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 LTC1430CS8#TRPBF?
For technical support, including LTC1430CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1430CS8#TRPBF requirements.
6.How does Aetrix verify that LTC1430CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1430CS8#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 LTC1430CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1430CS8#TRPBF?
All LTC1430CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1430CS8#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 LTC1430CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1430CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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