LTC3701 - 2-Phase, Low Input Voltage, Dual Step-Down DC/DC Controller
Features
- Out-of-Phase Controllers Reduce Required Input Capacitance
- True PLL for Frequency Locking or Frequency Adjustment
- Operating Frequency Range: 300kHz to 750kHz
- Wide VIN Range: 2.5V to 10V
- Constant Frequency Current Mode Architecture
- Low Dropout: 100% Duty Cycle
- Power Good Output Voltage Monitor
- Internal Soft-Start Circuitry
- Selectable Burst Mode®/Pulse Skipping Operation at Light Loads
- Output Overvoltage Protection
- Low Quiescent Current: 460µA
- 0.8V ±2% Voltage Reference
- Small 16-Lead Narrow SSOP Package
Typical Application
Description
The LTC3701 is a 2-phase dual constant frequency current mode step-down DC/DC controller providing excellent load and line regulation. Power loss and noise due to ESR of the input capacitor are minimized by operating the two controller output stages out-of-phase.
The LTC3701 provides a 0.8V ±2% voltage reference and consumes only 460µA of quiescent current. To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle).
Switching frequency is internally set at 550kHz, allowing the use of small inductors and capacitors. For noise sensitive applications, the LTC3701 can be externally synchronized using its phase-locked loop. The frequency can also be externally set from 300kHz to 750kHz by applying a voltage to the PLLLPF pin. Burst Mode operation is inhibited during synchronization or when the EXTCLK/MODE pin is pulled low to reduce noise and RF interference.
The LTC3701 contains independent internal soft-start circuitry for each controller. Other features include a power good output voltage monitor and output overvoltage and short-circuit protection.
The LTC3701 is available in a small footprint 16-lead narrow SSOP package.
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 |
|---|---|---|---|---|---|
| LTC3701EGN#PBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LTC3701EGN#TRPBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | 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 | |
|---|---|---|---|---|---|---|
| LTC3701EGN#PBF | SSOP-16 | E | $4.02 | $3.40 | Yes | |
| LTC3701EGN#TRPBF | SSOP-16 | E | $3.46 | 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 |
|---|---|---|---|
| DC424A | LTC3701EGN | 2-Phase Dual Step-Down Converter, 2.5V~9.8Vin, 2.5V @ 1.6A and 1.8V @ 1.6A | $175.00 | |
| Buy Now | |||
Applications
- One or Two Lithium-Ion Powered Applications
- Notebook and Handheld Computers
- Personal Digital Assistants
- Portable Instruments
- Distributed DC Power 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:
LTC3701
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.
