LTC1430A - High Power Step-Down Switching Regulator Controller
Features
- High Power 5V to 1.xV-3.xV Switching Controller: Can Exceed 10A Output
- Maximum Duty Cycle > 90% Permits 3.3V to 2.xV Conversion Using a Low Power 5V Supply
- All N-Channel External MOSFETs
- Fixed Frequency Operation—Small L
- Excellent Output Regulation: ±1% Over Line, Load and Temperature Variations
- High Efficiency: Over 95% Possible
- No Low Value Sense Resistor Needed
- Outputs Can Drive External FETs with Up to 10,000pF Gate Capacitance
- Quiescent Current: 350µA Typ, 1µA in Shutdown
- Fast Transient Response
- Adjustable or Fixed 3.3V Output
- Available in 8-Lead SO and 16-Lead GN and SO Packages
Typical Application
Description
The LTC1430A is a high power, high efficiency switching regulator controller optimized for 5V to 1.xV-3.xV applications. It includes a precision internal reference and an internal feedback system that can provide output regulation of ±1% over temperature, load current and line voltage shifts. The LTC1430A uses a synchronous switching architecture with two N-channel output devices, eliminating the need for a high power, high cost P-channel device. Additionally, it senses output current across the drain-source resistance of the upper N-channel FET, providing an adjustable current limit without an external low value sense resistor.
The LTC1430A includes a fixed frequency PWM oscillator for low output ripple under virtually all operating conditions. The 200kHz free-running clock frequency can be externally adjusted from 100kHz to above 500kHz. The LTC1430A’s maximum duty cycle is typically 93.5% compared to 88% for the LTC1430. This permits 3.3V to 2.xV conversion using a low power 5V supply. The LTC1430A features low 350µA quiescent current, allowing greater than 90% efficiency operation in converter designs from 1A to greater than 50A output current. Shutdown mode drops the LTC1430A supply current to 1µA.
For new designs, refer to the LTC3830.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC1430ACGN#PBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC1430ACGN#TRPBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC1430ACS#PBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1430ACS#TRPBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1430ACS8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1430ACS8#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1430AIGN#PBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LTC1430AIGN#TRPBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC1430ACGN#PBF | SSOP-16 | C | $4.61 | $3.90 | Yes | |
| LTC1430ACGN#TRPBF | SSOP-16 | C | $3.96 | Yes | ||
| LTC1430ACS#PBF | SO-16 | C | $4.16 | $3.52 | Yes | |
| LTC1430ACS#TRPBF | SO-16 | C | $3.58 | Yes | ||
| LTC1430ACS8#PBF | SO-8 | C | $3.62 | $3.06 | Yes | |
| LTC1430ACS8#TRPBF | SO-8 | C | $3.12 | Yes | ||
| LTC1430AIGN#PBF | SSOP-16 | I | $5.78 | $4.90 | Yes | |
| LTC1430AIGN#TRPBF | SSOP-16 | I | $4.96 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC091B | LTC1430ACS | DC/DC CONVERTER, 5V INPUT/ 3.3V OUT @ 10A | Contact Factory | |
| DC153A | LTC1430ACS | DC TO DC CONVERTER 5V TO 3.3V @6A, LONG LIFE, SMALL SIZE | Contact Factory | |
| DC156A | LTC1430ACS | LOW COST CPU SUPPLY, JMPR SEL. OUTPUT | Contact Factory | |
| DC201A | LTC1430ACS | LOW VOLTAGE 30 AMP POWER SUPPLY, 5Vin, 2.5Vout @30A | Contact Factory | |
| Buy Now | |||
Applications
- Power Supply for Pentium® II and AMD-K6® Microprocessors
- High Power 5V to 3.xV Regulators
- Local Regulation for Dual Voltage Logic Boards
- Low Voltage, High Current Battery Regulation
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC1430
LTC1430A
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
