LTC1433 - 450mA, Low Noise Current Mode Step-Down DC/DC Converter
Features
- High Efficiency: Up to 93%
- Constant Frequency Adaptive Power™ Operation
- Input Voltage Range: 3V to 13.5V
- Internal 0.6 ohms Power Switch (VIN = 10V)
- Low Dropout Operation: 100% Duty Cycle
- Low-Battery Detector
- Internal Power-On Reset Timer
- Current Mode Operation for Excellent Line and Load Transient Response
- Low Quiescent Current: 470µA
- Shutdown Mode Draws Only 15µA Supply Current
- ±1% Reference Accuracy
- Available in 16- and 20-Lead Narrow SSOP
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC1433/LTC1434 are monolithic pulse width modulated step-down DC/DC converters. By utilizing current mode switching techniques, they provide excellent AC and DC load and line regulation. Both devices operate at a fixed frequency with the LTC1434 phase-lockable to an external clock signal.Both devices incorporate two internal P-channel power MOSFETs with a parallel combined resistance of 0.6 ohms (at a supply of 10V). The Adaptive Power output stage selectively drives one or both of the switches at frequencies up to 700kHz to reduce switching losses and maintain high efficiencies at low output currents.
The LTC1433/LTC1434 are capable of supplying up to 450mA of output current and boasts a ±2.4% output voltage accuracy. An internal low-battery detector has the same level of accuracy as the output voltage. A power-on reset timer (POR) is included which generates a signal delayed by 65536/fCLK (300ms typ) after the output is within 5% of the regulated output voltage.
Ideal for current sensitive applications, the devices draw only 470µA of quiescent current. In shutdown the devices draw a mere 15µA. To further maximize the life of the battery source, the internal P-channel MOSFET switch is turned on continuously in dropout.
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 |
|---|---|---|---|---|---|
| LTC1433CGN#PBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC1433CGN#TRPBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC1433IGN#PBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LTC1433IGN#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 | |
|---|---|---|---|---|---|---|
| LTC1433CGN#PBF | SSOP-16 | C | $4.55 | $3.70 | Yes | |
| LTC1433CGN#TRPBF | SSOP-16 | C | $3.76 | Yes | ||
| LTC1433IGN#PBF | SSOP-16 | I | $5.00 | $4.05 | Yes | |
| LTC1433IGN#TRPBF | SSOP-16 | I | $4.11 | 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 |
|---|---|---|---|
| DC144A | LTC1433CGN | CURRENT MODE PWM STEP DOWN DC/DC | Contact Factory | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC1433IGN#PBF | SSOP-16 | I | $5.00 | $4.05 | Yes | |
| LTC1433IGN#TRPBF | SSOP-16 | I | $4.11 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Cellular Telephones
- Portable Instruments
- Wireless Modems
- RF Communications
- Distributed Power Systems
- Scanners
- Battery-Powered Equipment
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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:
LTC1433
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.
