LTC1709
PRODUCTION2-Phase, 5-Bit Adjustable,High Efficiency, Synchronous Step-Down Switching Regulator
- Part Models
- 2
- 1ku List Price
- Starting From $8.69
Overview
- Two Ouput Stages Operate Antiphase Reducing Input Capacitance and Power Supply Noise
- 5-Bit VID Control (VRM 8.4 Compliant)
VOUT: 1.3V to 3.5V in 50mV/100mV Steps - Current Mode Control Ensures Current Sharing
- True Remote Sensing Differential Amplifier
- OPTI-LOOP™ Compensation Minimizes COUT
- Programmable Fixed Frequency: 150kHz to 300kHz—Effective 300kHz to 600kHz Switching Frequency
- ±1% Output Voltage Accuracy
- Wide VIN Range: 4V to 36V Operation
- Adjustable Soft-Start Current Ramping
- Internal Current Foldback
- Short-Circuit Shutdown Timer with Defeat Option
- Overvoltage Soft-Latch Eliminates Nuisance Trips
- Low Shutdown Current: 20µA
- Small 36-Lead Narrow (0.209") SSOP Package
The LTC1709 is a 2-phase, VID programmable, synchronous step-down switching regulator controller that drives all N-channel external power MOSFET stages in a fixed frequency architecture. The 2-phase controller drives its two output stages out of phase at frequencies up to 300kHz to minimize the RMS ripple currents in both input and output capacitors. The 2-phase technique effectively multiplies the fundamental frequency by two, improving transient response while operating each channel at a optimum frequency for efficiency. Thermal design is also simplified.
An internal differential amplifier provides true remote sensing of the regulated supply’s positive and negative output terminals as required in high current applications.
The RUN/SS pin provides soft-start and optional timed, short-circuit shutdown. Current foldback limits MOSFET dissipaton during short-circuit conditions when overcurrent latchoff is disabled. OPTI-LOOP compensation allows the transient response to be optimized for a wide range of output capacitors and ESR values.
| Vout Range | VRM | |
| LTC1709 | 1.3V to 3.5V | VRM8.4 |
| LTC1709-7 | 0.925V to 2V | Mobile |
| LTC1709-8 | 1.3V to 3.5V | VRM8.4 |
| LTC1709-85 | 1.05V to 1.825V | VRM8.5 |
| LTC1709-9 | 1.1V to 1.85V | VRM9.0 |
Applications
- Desktop Computers
- Internet/Network Servers
- Large Memory Arrays
- DC Power Distribution Systems
- Battery Chargers
Documentation
Data Sheet 1
Design Note 2
Technical Articles 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC1709EG#PBF | 36-Lead SSOP | ||
| LTC1709EG#TRPBF | 36-Lead SSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Nov 18, 2019 - 19_0266 Laser Top Mark for SSOP36/44/48 Packages assembled in ADPG and UTAC |
||
| LTC1709EG#PBF | PRODUCTION | |
| LTC1709EG#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
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|---|---|---|
| Circuit Monitors 1 | ||
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| Hot Swap Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
| Power System Management (PSM) & Sequencers 1 | ||
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| Switching Regulators & Controllers 1 | ||
| LTC3880 | RECOMMENDED FOR NEW DESIGNS | Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC1709
- LTC1709-7
- LTC1709-8
- LTC1709-85
- LTC1709-9
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
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