LTC1629 - PolyPhase, High Efficiency, Synchronous Step-Down Switching Regulator
Features
- Dual Controller Operates from One to Twelve Phases
- Reduces Required Input Capacitance and Power Supply Induced Noise
- Current Mode Control Ensures Current Sharing
- Phase-Lockable Fixed Frequency: 150kHz to 300kHz
- 1.8MHz Effective Switching Frequency
- True Remote Sensing Differential Amplifier
- OPTI-LOOP™ Compensation Reduces COUT
- ±1% Output Voltage Accuracy
- Power Good Output Voltage Monitor (LTC1629-PG)
- Wide VIN Range: 4V to 36V Operation
- Very Low Dropout Operation: 99% Duty Cycle
- Adjustable Soft-Start Current Ramping
- Internal Current Foldback Plus Shutdown Timer
- Overvoltage Soft-Latch Eliminates Nuisance Trips
- Micropower Shutdown
- Available in 28-Lead SSOP Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC1629/LTC1629-PG are multiple phase, dual, synchronous step-down current mode switching regulator controllers that drive N-channel external power MOSFET stages in a phase-lockable fixed frequency architecture. The PolyPhase™ controller drives its two output stages out of phase at frequencies up to 300kHz to minimize the RMS ripple currents in both input and output capacitors. The output clock signal allows expansion for up to 12 evenly phased controllers for systems requiring 15A to 200A of output current. The multiple phase technique effectively multiplies the fundamental frequency by the number of channels used, 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 for high current applications. A RUN/SS pin provides both soft-start and optional timed, short-circuit shutdown. Current foldback limits MOSFET dissipation during short-circuit conditions when the overcurrent latchoff is disabled. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC1629-PG includes a power good output pin that replaces the AMPMD control pin of the LTC1629.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 |
|---|---|---|---|---|---|
| LTC1629CG-PG#PBF | SSOP-28 | G | C | 05-08-1640 (G28) | Yes |
| LTC1629CG-PG#TRPBF | SSOP-28 | G | C | 05-08-1640 (G28) | Yes |
| LTC1629CG#PBF | SSOP-28 | G | C | 05-08-1640 (G28) | Yes |
| LTC1629CG#TRPBF | SSOP-28 | G | C | 05-08-1640 (G28) | Yes |
| LTC1629IG-PG#PBF | SSOP-28 | G | I | 05-08-1640 (G28) | Yes |
| LTC1629IG-PG#TRPBF | SSOP-28 | G | I | 05-08-1640 (G28) | Yes |
| LTC1629IG#PBF | SSOP-28 | G | I | 05-08-1640 (G28) | Yes |
| LTC1629IG#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 | |
|---|---|---|---|---|---|---|
| LTC1629CG-PG#PBF | SSOP-28 | C | $7.32 | $6.17 | Yes | |
| LTC1629CG-PG#TRPBF | SSOP-28 | C | $6.27 | Yes | ||
| LTC1629CG#PBF | SSOP-28 | C | $7.15 | $5.95 | Yes | |
| LTC1629CG#TRPBF | SSOP-28 | C | $6.05 | Yes | ||
| LTC1629IG-PG#PBF | SSOP-28 | I | $8.51 | $7.19 | Yes | |
| LTC1629IG-PG#TRPBF | SSOP-28 | I | $7.29 | Yes | ||
| LTC1629IG#PBF | SSOP-28 | I | $8.15 | $6.95 | Yes | |
| LTC1629IG#TRPBF | SSOP-28 | I | $7.05 | 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 |
|---|---|---|---|
| DC226A | LTC1629CG | Polyphase DC-DC Converter, 5 to 13Vin, 3.3Vout @ 20A | Contact Factory | |
| DC256A | LTC1629CG | 6 Phase, Very High Current, Low Voltage Power Supply, 5 to 12Vin, 3.3Vout @ 90A or 5Vout @ 60Amps | Contact Factory | |
| DC311A | LTC1709-9EG / LTC1629CG | 4-Phase High Current Power Supply, Vin = 12V, Vout = 1.1V~1.8V @ 60A | $250.00 | |
| DC352A | LTC1629CG LTC1628-SYNC | PolyPhase Dual Output High Current Power Supply, 5V to 14Vin, 1.6Vout @ 52A max., 2.5Vout @ 15A max (thru-hole input caps) | 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 | |
|---|---|---|---|---|---|---|
| LTC1629IG-PG#PBF | SSOP-28 | I | $8.51 | $7.19 | Yes | |
| LTC1629IG-PG#TRPBF | SSOP-28 | I | $7.29 | Yes | ||
| LTC1629IG#PBF | SSOP-28 | I | $8.15 | $6.95 | Yes | |
| LTC1629IG#TRPBF | SSOP-28 | I | $7.05 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Desktop Computers
- Internet 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:
LTC1629
LTC1629-6
LTC1629-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.
