LTC3802 - Dual 550kHz Synchronous 2-Phase DC/DC Controller with Programmable Up/Down Tracking
Features
- Wide VIN Range: 3V to 30V Operation with Line Feedforward Compensation
- Leading Edge Modulation Architecture for Extremely Low Duty Cycle Operation
- Phase-Lockable Fixed Frequency: 330kHz to 750kHz
- Two 180° Out-of-Phase Controllers
- Fast Programmable Power-Up/-Down Tracking
- Programmable Current Limit Without External Current Sense Resistor
- Optional Burst Mode® Operation at Light Load
- ±1% 0.6V Voltage Reference
- External N-Channel MOSFET Architecture
- Low Shutdown Current: <100µA
- Overvoltage Protection and PGOOD Flag
- Small 28-Lead SSOP and 32-Lead QFN Packages
Typical Application
Description
The LTC®3802 is a dual switching regulator controller optimized for high efficiency step-down conversion from input voltages between 3V to 30V. The controller uses a leading edge modulation scheme to allow extremely low duty cycle operation. The constant frequency voltage mode controller allows a phase-lockable frequency between 330kHz and 750kHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages 180° out of phase. The synchronous buck architecture automatically shifts to Burst Mode operation as the output load decreases, ensuring maximum efficiency over a wide range of load currents.
The LTC3802 features an onboard, trimmed 0.6V reference and provides better than 1% regulation at the converter outputs. A separate output sense provides real time overvoltage protection and PGOOD sensing. An FBT pin programs the power-up/-down tracking between the two channels to meet various sequencing requirements. A RUN/SS pin provides soft-start and externally programmable current limit protection functions.
U.S. Patent Nos 5481178, 5846544, 6304066, 6580258, 5055767, 6307356
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 |
|---|---|---|---|---|---|
| LTC3802EGN#PBF | SSOP-28 | GN | E | 05-08-1641 (GN28) | Yes |
| LTC3802EGN#TRPBF | SSOP-28 | GN | E | 05-08-1641 (GN28) | Yes |
| LTC3802EUH#PBF | 5x5 QFN-32 | UH | E | 05-08-1693 | Yes |
| LTC3802EUH#TRPBF | 5x5 QFN-32 | UH | E | 05-08-1693 | 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 | |
|---|---|---|---|---|---|---|
| LTC3802EGN#PBF | SSOP-28 | E | $5.71 | $4.80 | Yes | |
| LTC3802EGN#TRPBF | SSOP-28 | E | $4.90 | Yes | ||
| LTC3802EUH#PBF | 5x5 QFN-32 | E | $5.71 | $4.80 | Yes | |
| LTC3802EUH#TRPBF | 5x5 QFN-32 | E | $4.90 | 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 |
|---|---|---|---|
| DC653A | LTC3802EGN Demo Board | Dual, Vin = 7V to 24V, Vout1 = 3.3V @ 15A, Vout2 = 2.5V @ 15A | Contact Factory | |
| Buy Now | |||
Applications
- Notebook and Palmtop Computers
- Portable Instruments
- Battery-Operated Digital Devices
- 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:
LTC3802
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.
