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Part Number: LTC3809-1
Description: The LTC®3809-1 is a synchronous step-down switching regulator controller that drives external comp...
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LTC3809-1
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DataSheet
General Description
LTC3809-1 General Description
The LTC®3809-1 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.
Optional Burst Mode operation provides high efficiency operation at light loads. 100% duty cycle provides low dropout operation, extending operating time in batterypowered systems. Burst Mode is inhibited when the MODE pin is pulled low to reduce noise and RF interference.
The LTC3809-1 allows either coincident or ratiometric output voltage tracking. Switching frequency is fixed at 550kHz. Fault protection is provided by an overvoltage comparator and a short-circuit current limit comparator.
The LTC3809-1 is available in the tiny footprint thermally enhanced DFN and 10-lead MSOP packages.
LTC3809-1 Maximum Ratings
Input Supply Voltage (VIN)........................... 0.3V to 10V
RUN, TRACK/SS, 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 Ambient Temperature Range
DFN ...................................................... 65°C to 125°C
MSOP ................................................... 65°C to 150°C
Junction Temperature (Note 3)............................... 125°C
Lead Temperature (Soldering, 10 sec)
MSOP Package ....................................................... 300°C
RUN, TRACK/SS, 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 Ambient Temperature Range
DFN ...................................................... 65°C to 125°C
MSOP ................................................... 65°C to 150°C
Junction Temperature (Note 3)............................... 125°C
Lead Temperature (Soldering, 10 sec)
MSOP Package ....................................................... 300°C
LTC3809-1 Features
Programmable Output Voltage Tracking
No Current Sense Resistor Required
Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response
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
Selectable Maximum Peak Current Sense Threshold
Output Overvoltage Protection
Micropower Shutdown: IQ = 9µA
Tiny Thermally Enhanced Leadless (3mm * 3mm) DFN and 10-lead MSOP Packages
No Current Sense Resistor Required
Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response
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
Selectable Maximum Peak Current Sense Threshold
Output Overvoltage Protection
Micropower Shutdown: IQ = 9µA
Tiny Thermally Enhanced Leadless (3mm * 3mm) DFN and 10-lead MSOP Packages
LTC3809-1 Typical Application
One- or Two-Cell Lithium-Ion Powered Devices
Notebook and Palmtop Computers, PDAs
Portable Instruments
Distributed DC Power Systems
Notebook and Palmtop Computers, PDAs
Portable Instruments
Distributed DC Power Systems
LTC3809-1 Connection Diagram
LTC3809-1
PDF/DataSheet Download
- Datasheet: LTC3809-1
- File Size: 334642 KB
- Manufacturer: Linear
- Click here to Download
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