LTC3878 - Fast, Wide Operating Range No RSENSE Step-Down DC/DC Controller
Features
- Wide VIN Range: 4V to 38V
- ±1% 0.8V Voltage Reference
- Extremely Fast Transient Response
- tON(MIN): 43ns
- No RSENSE™ Valley Current Mode Control
- Stable with Low ESR Ceramic COUT
- Supports Smooth Start-Up Into Pre-Biased Output
- Optimized for High Step-Down Ratios
- Pin Compatible with the LTC1778 (No EXTVCC Pin)
- Power Good Output Voltage Monitor
- Dual N-Channel MOSFET Synchronous Drive
- Adjustable Switching Frequency
- Programmable Current Limit with Foldback
- Output Overvoltage Protection
- Small 16-Pin Narrow SSOP Package
Typical Application
Description
The LTC3878 is a synchronous step-down switching DC/DC controller optimized for high switching frequency and fast transient response. The constant on-time valley current mode architecture allows for a wide input range, including very low duty factor operation. No external sense resistor or slope compensation is required. The LTC3878 is pin compatible with the LTC1778 in applications that do not use EXTVCC while offering better efficiency. Consult with the factory to verify compatibility.
Operating frequency is set by an external resistor and compensated for variations in VIN to offer excellent line stability. Discontinuous mode operation provides high efficiency during light load conditions. A forced continuous control pin allows the user to reduce noise and RF interference. Safety features include output overvoltage protection and programmable current limit with foldback. Soft-start capability for supply sequencing is accomplished through an external timing capacitor. The current limit is user programmable.
The LTC3878 allows operation from 4V to 38V at the input and from 0.8V to 90% VIN at the output. The LTC3878 is available in a small 16-pin narrow SSOP package.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
SSOP-16
Order Info
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- 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 | Pins | Temp | Price (1-99) | Price (1k)* | RoHS Data |
|---|---|---|---|---|---|---|
| LTC3878EGN#PBF | SSOP | 16 | E | $2.44 | $1.71 | View |
| LTC3878EGN#TRPBF | SSOP | 16 | E | $1.77 | View | |
| LTC3878IGN#PBF | SSOP | 16 | I | $2.77 | $1.94 | View |
| LTC3878IGN#TRPBF | SSOP | 16 | I | $2.00 | View | |
| 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 |
|---|---|---|---|
| DC1292A | LTC3878EGN Demo Board | Wide Operating Range No Rsense Step-Down Controller | $125.00 | |
| Buy Now | |||
Applications
- Distributed Power Systems
- Embedded Computing
- Communications Infrastructure
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Simulate
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Related models available in LTspice IV
LTC3878
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.
