LTC1929 - 2-Phase, High Efficiency, Synchronous Step-DownSwitching Regulators
Features
- 2-Phase Single Output Controller
- Reduces Required Input Capacitance and Power Supply Induced Noise
- Current Mode Control Ensures Current Sharing
- Phase-Lockable Fixed Frequency: 150kHz to 300kHz
- True Remote Sensing Differential Amplifier
- OPTI-LOOP™ Compensation Improves Transient Response
- ±1% Output Voltage Accuracy
- Wide VIN Range: 4V to 36V Operation
- Very Low Dropout Operation: 99% Duty Cycle
- Adjustable Soft-Start Current Ramping
- Internal Current Foldback
- Short-Circuit Shutdown Timer with Defeat Option
- Overvoltage Soft-Latch Eliminates Nuisance Trips
- Available in 28-Lead SSOP Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC1929/LTC1929-PG are 2-phase, single output, synchronous step-down current mode switching regulator controllers that drive N-channel external power MOSFET stages in a phase-lockable fixed frequency architecture. The 2-phase controllers drive their two output stages out of phase at frequencies up to 300kHz to minimize the RMS ripple currents in both input and output capacitors. The 2-phase technique effectively multiplies the fundamental frequency by two, improving transient response while operating each channel at an optimum frequency for efficiency. Thermal design is also simplified.An internal differential amplifier provides true remote sensing of the regulated supply’s positive and negative output terminals as required by high current applications.
The RUN/SS pin provides soft-start and a defeatable, timed, latched short-circuit shutdown to shut down both channels. Internal foldback current limit provides protection for the external synchronous MOSFETs in the event of an output fault. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values.
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 |
|---|---|---|---|---|---|
| LTC1929CG-PG#PBF | SSOP-28 | G | C | 05-08-1640 (G28) | Yes |
| LTC1929CG-PG#TRPBF | SSOP-28 | G | C | 05-08-1640 (G28) | Yes |
| LTC1929CG#PBF | SSOP-28 | G | C | 05-08-1640 (G28) | Yes |
| LTC1929CG#TRPBF | SSOP-28 | G | C | 05-08-1640 (G28) | Yes |
| LTC1929IG-PG#PBF | SSOP-28 | G | I | 05-08-1640 (G28) | Yes |
| LTC1929IG-PG#TRPBF | SSOP-28 | G | I | 05-08-1640 (G28) | Yes |
| LTC1929IG#PBF | SSOP-28 | G | I | 05-08-1640 (G28) | Yes |
| LTC1929IG#TRPBF | SSOP-28 | G | I | 05-08-1640 (G28) | 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 | |
|---|---|---|---|---|---|---|
| LTC1929CG-PG#PBF | SSOP-28 | C | $5.27 | $4.45 | Yes | |
| LTC1929CG-PG#TRPBF | SSOP-28 | C | $4.55 | Yes | ||
| LTC1929CG#PBF | SSOP-28 | C | $5.12 | $4.30 | Yes | |
| LTC1929CG#TRPBF | SSOP-28 | C | $4.40 | Yes | ||
| LTC1929IG-PG#PBF | SSOP-28 | I | $5.98 | $5.05 | Yes | |
| LTC1929IG-PG#TRPBF | SSOP-28 | I | $5.15 | Yes | ||
| LTC1929IG#PBF | SSOP-28 | I | $5.90 | $4.99 | Yes | |
| LTC1929IG#TRPBF | SSOP-28 | I | $5.09 | 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 |
|---|---|---|---|
| DC439A-A | LTC1929CG-PG | Dual Phase, Step-Down Supply w/Hot Swappable Load Share Module, 5V to 14V Input, 3.3Vout @ 40A | Contact Factory | |
| DC439A-B | LTC1929CG-PG LTC4350GN | Dual Phase, Step-Down Supply w/Hot Swappable Load Share Module, 5V to 14V Input, 3.3Vout @ 40A | 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 | |
|---|---|---|---|---|---|---|
| LTC1929IG-PG#PBF | SSOP-28 | I | $5.98 | $5.05 | Yes | |
| LTC1929IG-PG#TRPBF | SSOP-28 | I | $5.15 | Yes | ||
| LTC1929IG#PBF | SSOP-28 | I | $5.90 | $4.99 | Yes | |
| LTC1929IG#TRPBF | SSOP-28 | I | $5.09 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Desktop Computers
- Internet/Network Servers
- Large Memory Arrays
- DC Power Distribution Systems
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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:
LTC1929
LTC1929-PG
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.
