LTC3828 - Dual, 2-Phase Step-Down Controller with Tracking
Features
- Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
- Tracking for Both Outputs
- Constant Frequency Current Mode Control
- Wide VIN Range: 4.5V to 28V Operation
- Power Good Output Voltage Indicator
- Adjustable Soft-Start Current Ramping
- Foldback Output Current Limiting- Disabled at Start-Up
- No Reverse Current During Soft-Start Interval
- Clock Output for 3-, 4-, 6-Phase Operation
- Dual N-Channel MOSFET Synchronous Drive
- ±1% Output Voltage Accuracy
- Phase-Lockable Fixed Frequency 260kHz to 550kHz
- OPTI-LOOP® Compensation Minimizes COUT
- Very Low Dropout Operation: 99% Duty Cycle
- Output Overvoltage Protection
- Small 28-Lead SSOP and 5mm × 5mm QFN Packages
Typical Application
Description
The LTC3828 is a dual high performance step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows for a phase-lockable frequency of up to 550kHz. The TRCKSS pin provides both soft-start and tracking functions. Multiple LTC3828s can be daisy-chained in applications requiring more than two voltages to be tracked.
OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The precision 0.8V reference and power good output indicator are compatible with a wide 4.5V to 28V (30V maximum) input supply range, encompassing all battery chemistries.
The RUN pins control their respective channels independently. The FCB/PLLIN pin selects among Burst Mode operation, skip-cycle mode and continuous current mode. Current foldback limits MOSFET dissipationduring short-circuit conditions. Reverse current and current foldback functions are disabled during soft-start.
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 |
|---|---|---|---|---|---|
| LTC3828EG#PBF | SSOP-28 | G | E | 05-08-1640 (G28) | Yes |
| LTC3828EG#TRPBF | SSOP-28 | G | E | 05-08-1640 (G28) | Yes |
| LTC3828EUH#PBF | 5x5 QFN-32 | UH | E | 05-08-1693 | Yes |
| LTC3828EUH#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 | |
|---|---|---|---|---|---|---|
| LTC3828EG#PBF | SSOP-28 | E | $6.64 | $4.65 | Yes | |
| LTC3828EG#TRPBF | SSOP-28 | E | $4.75 | Yes | ||
| LTC3828EUH#PBF | 5x5 QFN-32 | E | $6.64 | $4.65 | Yes | |
| LTC3828EUH#TRPBF | 5x5 QFN-32 | E | $4.75 | 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 |
|---|---|---|---|
| DC802A | LTC3828EUH Demo Board | 2-Phase, Tracking, 7V ≤ VIN ≤ 21V; Vout1 = 5V @ 5A, Vout2 = 3.3V @ 5A | Contact Factory | |
| DC884A | LTC3828EUH Demo Board | 2-Phase, Tracking, 5V ≤ VIN ≤ 12V; Vout1 = 2V @ 17A, Vout2 = 1.5V @ 17A | Contact Factory | |
| DC980A/B | LTC2970 Demo Board | Dual Power Supply Monitor and Margining Controller [requires DC590] | $150.00 | |
| Buy Now | |||
Companion Boards
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC2026C | Linduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform | $75.00 | |
| DC590B | Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards | $50.00 | |
| Buy Now | |||
Applications
- Telecom Infrastructure
- ASIC Power Supply
- Industry Equipment
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Product Notifications
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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:
LTC3828
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.
