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Part Number: LTC3809
Description: The LTC®3809 is a synchronous step-down switching regulator controller that drives external comple...
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LTC3809
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DataSheet
General Description
LTC3809 General Description
The LTC®3809 is a synchronous step-down switching regulator controller that drives external complementary power MOSFETs using few external components. The constant frequency current mode architecture with MOSFET VDS sensing eliminates the need for a current sense resistor and improves efficiency.
For noise sensitive applications, the LTC3809 can be externally synchronized from 250kHz to 750kHz. Burst Mode is inhibited during synchronization or when the SYNC/ MODE pin is pulled low to reduce noise and RF interference. To further reduce EMI, the LTC3809 incorporates a novel spread spectrum frequency modulation technique.
Burst Mode operation provides high efficiency operation at light loads. 100% duty cycle provides low dropout operation, extending operating time in battery-powered systems. The switching frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors.
The LTC3809 is available in the tiny footprint thermally enhanced DFN and 10-lead MSOP packages.
LTC3809 Maximum Ratings
Input Supply Voltage (VIN).............................. 0.3V to 10V
PLLLPF, RUN, SYNC/MODE,
IPRG Voltages .................................... 0.3V to (VIN + 0.3V)
VFB, ITH Voltages........................................... 0.3V to 2.4V
SW Voltage ............................... 2V to VIN + 1V (10V Max)
TG, BG Peak Output Current (<10µs) ............................... 1A
Operating Temperature Range (Note 2).... 40°C to 85°C
Storage Temperature Range .................... 65°C to 125°C
Junction Temperature (Note 3) .................................. 125°C
Lead Temperature (Soldering, 10 sec)
MSOP Package ............................................................ 300°C
PLLLPF, RUN, SYNC/MODE,
IPRG Voltages .................................... 0.3V to (VIN + 0.3V)
VFB, ITH Voltages........................................... 0.3V to 2.4V
SW Voltage ............................... 2V to VIN + 1V (10V Max)
TG, BG Peak Output Current (<10µs) ............................... 1A
Operating Temperature Range (Note 2).... 40°C to 85°C
Storage Temperature Range .................... 65°C to 125°C
Junction Temperature (Note 3) .................................. 125°C
Lead Temperature (Soldering, 10 sec)
MSOP Package ............................................................ 300°C
LTC3809 Features
No Current Sense Resistor Required
Selectable Spread Spectrum Frequency Modulation for Low Noise Operation
Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response
True PLL for Frequency Locking or Adjustment (Frequency Range: 250kHz to 750kHz)
Wide VIN Range: 2.75V to 9.8V
Wide VOUT Range: 0.6V to VIN
0.6V ±1.5% Reference
Low Dropout Operation: 100% Duty Cycle
Selectable Burst Mode®/Pulse Skipping/Forced Continuous Operation
Auxiliary Winding Regulation
Internal Soft-Start Circuitry
Power Good Output Voltage Monitor
Output Overvoltage Protection
Micropower Shutdown: IQ = 9µA
Tiny Thermally Enhanced Leadless (3mm * 3mm) DFN and 10-lead MSOP Packages
Selectable Spread Spectrum Frequency Modulation for Low Noise Operation
Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response
True PLL for Frequency Locking or Adjustment (Frequency Range: 250kHz to 750kHz)
Wide VIN Range: 2.75V to 9.8V
Wide VOUT Range: 0.6V to VIN
0.6V ±1.5% Reference
Low Dropout Operation: 100% Duty Cycle
Selectable Burst Mode®/Pulse Skipping/Forced Continuous Operation
Auxiliary Winding Regulation
Internal Soft-Start Circuitry
Power Good Output Voltage Monitor
Output Overvoltage Protection
Micropower Shutdown: IQ = 9µA
Tiny Thermally Enhanced Leadless (3mm * 3mm) DFN and 10-lead MSOP Packages
LTC3809 Typical Application
One or Two Lithium-Ion Powered Devices
Portable Instruments
Distributed DC Power Systems
Portable Instruments
Distributed DC Power Systems
LTC3809 Connection Diagram
LTC3809
PDF/DataSheet Download
- Datasheet: LTC3809
- File Size: 278528 KB
- Manufacturer: Linear
- Click here to Download
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