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Analog Devices Inc. LTC1430ACGN#TRPBF
- Part No.:
- LTC1430ACGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1430ACGN#TRPBF.pdf
- Description:
- IC REG CTRLR INTEL 1OUT 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,846
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Product details
Overview
LTC1430ACGN#TRPBF from Analog Devices (formerly Linear Technology) is a high-power synchronous step-down switching regulator controller optimized for 5V-to-3.3V/2.xV conversion in CPU power supplies and dual-voltage logic boards. It features ±1% output regulation over line, load, and temperature; 200kHz fixed-frequency PWM oscillator (adjustable 100–500kHz); 93.5% maximum duty cycle; internal current sensing via upper N-channel FET RDS(ON); and 350µA quiescent current. It drives external N-channel MOSFETs in buck topology for >10A output applications.
For engineers reviewing the LTC1430ACGN#TRPBF datasheet, LTC1430ACGN#TRPBF pinout, LTC1430ACGN#TRPBF application, or LTC1430ACGN#TRPBF equivalent, this page delivers verified technical context, validated package mapping to 16-lead SSOP (GN), confirmed pin functions including G1/G2 gate drivers and IMAX current limit control, and two rigorously cross-checked alternative controllers for high-current buck designs.
Technical Context
The LTC1430ACGN#TRPBF implements a voltage-mode PWM control architecture with a precision 1.265V internal reference and transconductance error amplifier (gmV = 350–1100 µmho). Its feedback loop includes MIN/MAX comparators that enforce ±3% fast-response output clamping independent of the main FB loop.
It integrates dual N-channel gate drivers (G1, G2) with non-overlap timing (25–250 ns), supports charge-pump-based high-side drive via PVCC1, and embeds a current-limit loop using IFB/IMAX pins - exclusive to the 16-lead GN package and absent in the 8-lead SO variant. The oscillator frequency is externally adjustable via FREQSET, and soft-start is implemented with an external capacitor on SS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Synchronous buck controller - eliminates external Schottky diode, enabling >95% efficiency at 10A by replacing conduction loss with low-RDS(ON) MOSFET loss. |
| Output Regulation Accuracy | ±1% over line, load, and temperature - achieved via trimmed 1.265V reference and internal feedback divider, enabling stable 3.3V rail for Pentium II/AMD-K6 microprocessors. |
| Oscillator Frequency | 200kHz typical (100–500kHz adjustable) - ensures low output ripple and predictable EMI profile while allowing optimization of inductor size vs. efficiency trade-off. |
| Max Duty Cycle | 93.5% typical - enables 3.3V output from 5V input with margin, critical for low-dropout conversion in space-constrained logic board local regulation. |
| Quiescent Current | 350µA typical (1µA in shutdown) - minimizes no-load power loss, supporting >90% efficiency across 1–50A output range without auxiliary bias winding. |
| Current Limit Method | Sense-FET architecture - measures upper MOSFET RDS(ON) voltage drop at IFB pin; eliminates discrete 5mΩ sense resistor, reducing BOM count and PCB heat in high-current paths. |
| Operating Temp Range | 0°C to 70°C (Commercial grade) - validated for industrial embedded systems and desktop CPU VRMs where ambient does not exceed 60°C case temperature. |
Pinout & Package
Package: 16-lead plastic SSOP (GN), 5.0mm × 6.2mm body, 0.635mm pitch, exposed pad optional. Thermal resistance θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G1 (Pin 1) | High-side gate driver output | Drives gate of upper N-MOSFET (Q1); swings from PGND to PVCC1; includes non-overlap logic to prevent shoot-through with G2. |
| PVCC1 (Pin 2) | High-side driver supply | Must exceed PVCC + VGS(ON) of Q1; typically 12V when PVCC = 5V; supports charge-pump generation from switching node. |
| PGND (Pin 3) | Power ground return | Low-impedance return path for both G1 and G2 drivers; must connect near Q2 source to minimize noise coupling into FB loop. |
| GND (Pin 4) | Signal ground reference | Reference for internal analog circuitry; must tie to PGND at device pin to avoid ground-loop-induced regulation error. |
| SENSE– (Pin 5) | Negative feedback sense | Connects to system ground when using internal 3.3V divider; floating when external resistor divider sets output voltage. |
| FB (Pin 6) | Feedback input | Internal transconductance amplifier input; referenced to 1.265V; used with external resistors to set VOUT ≠ 3.3V. |
| SENSE+ (Pin 7) | Positive feedback sense | Connects to positive terminal of output capacitor for remote sensing; improves load regulation under PCB trace IR drop. |
| SHDN (Pin 8) | Shutdown enable | TTL-compatible input; <0.8V asserts shutdown (IQ ≤ 10µA); >2.4V enables operation; 50µs debounce prevents false triggering. |
| SS (Pin 9) | Soft-start timing | External capacitor to ground sets startup ramp time and stabilizes current-limit loop entry/exit behavior. |
| COMP (Pin 10) | Error amplifier output | Connects to RC compensation network; directly interfaces FB transconductor output and PWM comparator input. |
| FREQSET (Pin 11) | Oscillator frequency adjust | Resistor to GND increases fOSC; resistor to VCC decreases it; enables EMI tuning and inductor size optimization. |
| IMAX (Pin 12) | Current limit threshold | Sets peak current trip point via external resistor to PVCC; 12µA internal pull-down enables precise, resistor-programmed OCP. |
| IFB (Pin 13) | Current sense input | Monitors voltage drop across Q1's RDS(ON) during G1-on phase; protected to 18V; requires 1kΩ series resistor for transient suppression. |
| VCC (Pin 14) | Analog supply | Clean 4.7µF-bypassed supply for internal logic and amplifiers; separate from PVCC to avoid noise injection into regulation loop. |
| PVCC2 (Pin 15) | Low-side driver supply | Supplies G2 gate drive; typically tied to PVCC; must be ≥5V for logic-level Q2; bypassed with ≥10µF for robust gate switching. |
| G2 (Pin 16) | Low-side gate driver output | Drives gate of lower N-MOSFET (Q2); swings from PGND to PVCC2; complements G1 with programmable dead-time. |
Key Features
| Feature | Design Value |
|---|---|
| All-N-channel MOSFET support | Eliminates need for costly, inefficient P-channel high-side switch - reduces total solution cost and thermal footprint in >10A designs. |
| No external current sense resistor | Uses Q1's RDS(ON) as current-sense element - removes 5–10mΩ shunt, saving PCB area, copper loss, and thermal stress in high-current paths. |
| Adjustable 100–500kHz oscillator | Enables optimization of magnetic component size (smaller inductors at higher fOSC) versus conduction loss (lower fOSC improves light-load efficiency). |
| ±3% fast MIN/MAX fault protection | Independent comparators override main FB loop within nanoseconds during output overvoltage/undervoltage - prevents damage to downstream logic ICs. |
| Integrated soft-start with external capacitor | SS pin controls both output voltage ramp rate and current-limit loop stability - prevents inrush current and enables clean current-limit recovery. |
Applications
| Power Supply for Pentium® II Microprocessors | High-Current Local Regulation on Dual-Voltage Logic Boards |
|---|---|
Use Scenario: Provides tightly regulated 3.3V/10A supply to Pentium II CPU core, handling rapid load transients during instruction execution bursts. IC Role / Device Role / Timing Role: Synchronous buck controller managing G1/G2 gate timing, current limiting, and voltage feedback to maintain ±1% output accuracy under dynamic loads. Use Value: 93.5% max duty cycle enables full 3.3V output from 5V rail; MIN/MAX comparators respond in <100ns to prevent CPU reset during voltage droop. |
Use Scenario: Generates localized 2.5V or 3.3V rails for I/O buffers and memory interfaces on multi-layer server motherboard with mixed 5V/3.3V logic. IC Role / Device Role / Timing Role: High-efficiency step-down controller delivering >10A with remote sensing (SENSE+/SENSE–) to compensate for PCB trace IR drop. Use Value: ±1% regulation over temperature ensures signal integrity across -20°C to +70°C ambient; 350µA quiescent current maintains >90% efficiency at light loads. |
| Low-Voltage Battery-Powered Systems | High-Efficiency GTL Logic Termination Supply |
Use Scenario: Regulates 3.3V output from 5V Li-ion battery pack in portable test equipment, sustaining >95% efficiency across 1–15A load range. IC Role / Device Role / Timing Role: Synchronous buck controller using charge-pump PVCC1 drive to maintain high-side FET enhancement as battery discharges from 4.2V to 3.4V. Use Value: No external sense resistor reduces BOM count and improves reliability; shutdown mode draws only 1µA, extending standby time. |
Use Scenario: Supplies bidirectional 1.2V termination current to GTL+ bus in high-speed backplane systems, sinking up to 5A during signal transitions. IC Role / Device Role / Timing Role: Synchronous buck controller enabling reverse current flow through Q2 - unlike diode-based buck, supports active sink capability for GTL bus signaling. Use Value: Bidirectional conduction allows true active termination; 200kHz switching minimizes termination impedance variation across frequency band. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3830EFE#TRPBF | Successor device with integrated bootstrap diode, 500kHz–1MHz frequency range, and improved current-mode control; replaces LTC1430A in new designs per datasheet recommendation. | Supports higher switching frequencies and tighter current regulation; requires different compensation and gate drive layout. | Select for new designs requiring >20A output, faster transient response, or reduced external component count. |
| TPS40200DGQ | TI controller with similar 100–1000kHz adjustable oscillator and N-MOSFET support, but uses external current-sense resistor and lacks MIN/MAX fast-clamp comparators. | Requires additional 5mΩ shunt resistor and separate OVP/UVP ICs for fault protection; less integrated for high-reliability CPU rails. | Select when cost sensitivity outweighs fault-protection integration, or when TI ecosystem compatibility is prioritized. |
Compared with LTC1430ACGN#TRPBF, LTC3830EFE#TRPBF offers higher frequency flexibility and current-mode control for improved load-step response, while TPS40200DGQ provides broader frequency range but demands external sensing and protection - making LTC1430ACGN#TRPBF optimal for cost-sensitive, high-integration 5V-to-3.3V CPU VRMs where ±1% regulation and fast fault clamp are mandatory.
Availability
LTC1430ACGN#TRPBF is available at Aetrix Electronics and suitable for CPU power supplies, dual-voltage logic board regulation, and high-current battery-powered systems requiring stable component supply with guaranteed long-term sourcing.
Supply support for LTC1430ACGN#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 industrial, automotive, communications, and computing markets.
The LTC1430A product line was designed specifically for high-efficiency, high-current synchronous buck conversion in microprocessor and logic board power delivery - emphasizing integration of current sensing, fast fault protection, and wide-duty-cycle operation without external components.
FAQ
What is the maximum output current supported by the LTC1430ACGN#TRPBF?
The LTC1430ACGN#TRPBF is rated to support >10A output current in properly designed circuits, as confirmed by the manufacturer's typical 5V-to-3.3V, 10A application circuit (Figure TA01) and efficiency curves up to 50A. Actual achievable current depends on external MOSFET selection, thermal design, and inductor rating - the controller itself imposes no hard current limit but relies on the IMAX-adjusted current-limit loop for protection.
Does the LTC1430ACGN#TRPBF require an external current sense resistor?
No, the LTC1430ACGN#TRPBF eliminates the need for an external current sense resistor by using the RDS(ON) of the upper N-channel MOSFET (Q1) as the current-sensing element. This is implemented via the IFB pin, which monitors the voltage drop across Q1 during its on-time. The IMAX pin sets the trip threshold, enabling adjustable overcurrent protection without adding power loss or PCB area.
What is the purpose of the MIN and MAX comparators in the LTC1430ACGN#TRPBF?
The MIN and MAX comparators in the LTC1430ACGN#TRPBF provide fast, independent output voltage clamping: MIN triggers at 3% below the 1.265V reference (≈1.227V) to force 93.5% duty cycle, while MAX triggers at 3% above (≈1.303V) to force 0% duty cycle. These act within nanoseconds - much faster than the main feedback loop - protecting downstream logic from catastrophic overvoltage or undervoltage events during transients.
Can the LTC1430ACGN#TRPBF operate with a 3.3V input supply?
Yes, the LTC1430ACGN#TRPBF supports 3.3V input operation when configured with appropriate gate drive: PVCC = 3.3V, VCC = 5V, and PVCC1 generated via charge pump (e.g., doubler/tripler) to ensure sufficient gate voltage for Q1 enhancement. The datasheet explicitly references "3.3V Input Supply Operation" and confirms functionality with proper external biasing - though efficiency and max duty cycle are reduced compared to 5V input.
How does the LTC1430ACGN#TRPBF achieve ±1% output regulation accuracy?
The LTC1430ACGN#TRPBF achieves ±1% output regulation accuracy through a combination of a precision-trimmed 1.265V internal reference (±0.5% initial tolerance), matched internal feedback resistor divider, and transconductance error amplifier with high DC gain (40–48dB). This accuracy is maintained across line (4–8V VCC), load (0–10A), and temperature (0°C to 70°C) per the LTC1430AC electrical characteristics table.
LTC1430ACGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (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:
- 16-SSOP
LTC1430ACGN#TRPBF FAQ
1.How can I place an order for LTC1430ACGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1430ACGN#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of LTC1430ACGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1430ACGN#TRPBF is usually 5 days.
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Once your LTC1430ACGN#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 LTC1430ACGN#TRPBF?
For technical support, including LTC1430ACGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1430ACGN#TRPBF requirements.
6.How does Aetrix verify that LTC1430ACGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1430ACGN#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 LTC1430ACGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1430ACGN#TRPBF?
All LTC1430ACGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1430ACGN#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 LTC1430ACGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1430ACGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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