Power Management
Switching Regulator
Step-Down (Buck) Regulators
Poly-Phase Buck Controllers
Power Management
Switching Regulator
Step-Down (Buck) Regulators
External Power Switch Buck Controllers
LTC3839 - Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller with Differential Output Sensing
Features
- Wide VIN Range: 4.5V to 38V, VOUT: 0.6V to 5.5V
- ±0.67% Output Voltage Accuracy Over Temperature, Differential Output Voltage Sensing, Allowing Up to ±500mV Line Loss at Remote Ground
- Controlled On-Time, Valley Current Mode Control
- Fast Load Transient Response
- Detect Transient (DTR) Reduces VOUT Overshoot
- Frequency Programmable from 200kHz to 2MHz, Synchronizable to External Clock
- tON(MIN) = 30ns, tOFF(MIN) = 90ns
- Up to 12-Phase Operation
- RSENSE or Inductor DCR Current Sensing
- Overvoltage Protection and Current Limit Foldback
- Power Good Output Voltage Monitor
- Output Voltage Tracking and Adjustable Soft Start-Up
- Thermally Enhanced 32-Pin (5mm × 5mm) QFN Package
Typical Application
Description
The LTC®3839 is a 2-phase, single-output PolyPhase® synchronous step-down switching regulator controller that drives all N-channel power MOSFETs. The controlled on-time, valley current mode control architecture allows for fast transient response and constant frequency switching in steady-state operation, independent of VIN, VOUT and load current. Its load-release transient detection feature significantly reduces overshoot at low output voltages.
Differential output voltage sensing, along with a precision internal reference, offers an accurate ±0.67% output regulation, even if the remote output ground deviates from local ground by ±500mV.
The switching frequency can be programmed from 200kHz to 2MHz with an external resistor and can be synchronized to an external clock. Very low tON and tOFF times allow for near 0% and near 100% duty cycles, respectively. Voltage tracking soft start-up and multiple safety features are provided.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
QFN-32
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 |
|---|---|---|---|---|---|---|
| LTC3839EUH#PBF | QFN | 32 | E | $4.54 | $3.18 | View |
| LTC3839EUH#TRPBF | QFN | 32 | E | $3.24 | View | |
| LTC3839IUH#PBF | QFN | 32 | I | $5.13 | $3.59 | View |
| LTC3839IUH#TRPBF | QFN | 32 | I | $3.65 | 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 |
|---|---|---|---|
| DC1632A | LTC3839EUH Demo Board | VIN = 4.5V to 14V, VOUT = 1.5V @ 40A | $125.00 | |
| Buy Now | |||
Applications
- Distributed Power Systems
- Point-of-Load Converters
- Computing Systems
- Data Communication Systems
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Simulate
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Related models available in LTspice IV
LTC3839
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.
