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LTC3447

Features: ` I2C Programmable Output with 21.6mV Resolution` Overtemperature Protected` High Effi ciency: Up to 93%` Very Low Quiescent Current: Only 33A` 600mA Output Current at VIN = 3V` 2.5V to 5.5V Input Voltage Range` 1MHz Constant Frequency Operation` No Schottky Diode Required` Low Dropout O...

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SeekIC No. : 004402248 Detail

LTC3447: Features: ` I2C Programmable Output with 21.6mV Resolution` Overtemperature Protected` High Effi ciency: Up to 93%` Very Low Quiescent Current: Only 33A` 600mA Output Current at VIN = 3V` 2.5V to 5....

LTC3447 Data Sheet

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Part Number:
LTC3447
Supply Ability:
5000

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  • 1~5000
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  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

` I2C Programmable Output with 21.6mV Resolution
` Overtemperature Protected
` High Effi ciency: Up to 93%
` Very Low Quiescent Current: Only 33A
` 600mA Output Current at VIN = 3V
` 2.5V to 5.5V Input Voltage Range
` 1MHz Constant Frequency Operation
` No Schottky Diode Required
` Low Dropout Operation: 100% Duty Cycle
` Stable with Ceramic Capacitors
` Shutdown Mode Draws <1A Supply Current
` ±2% Output Voltage Accuracy
` Standard (100kHz) or Fast Mode (400kHz) I2C
` 6-Bit Voltage DAC (0.69V to 2.05V)
` Disable Burst Mode Operation
` Enable Power Good Blanking
` Optional External Start-Up Resistors
` Soft-Start
` 10 Lead, 3mm * 3mm DFN Package


Application

· Distributed Power Supplies
· Notebook Computers
·PDAs and Other Handheld Devices


Pinout

Connection Diagram


Specifications

VIN, VCCD Voltages .......................................0.3V to 6V
RUN, VOUT, FB Voltages .............................. 0.3V to VIN
SW Voltage ................................... 0.3V to (VIN + 0.3V)
SCL, SDA Voltages ................................. 0.3V to V CCD
P-Channel Switch Source Current (DC) ...............800mA
N-Channel Switch Sink Current (DC) ...................800mA
Peak SW Sink and Source Current ...........................1.3A
Operating Temperature Range (Note 2) 40°C to 85°C
Junction Temperature (Note 3) ............................ 125°C
Storage Temperature Range ................65°C to 125°C


Description

The LTC®3447 is a high effi ciency monolithic synchronous current mode buck regulator. Using an I2C interface, the output voltage can be set between 0.69V and 2.05V using an internal 6-bit DAC.

The buck regulator of LTC3447 has optional external feedback resistors that can be used for setting the initial start up voltage. The feedback voltage reference for this start-up option is 0.6V. Once the voltage DAC is updated via the I2C, the buck regulator switches from external to internal feedback resistors. When there are no external resistors, the default start-up voltage is 1.38V.

The switching frequency is internally set at 1MHz, allowing the use of small surface mount inductors and capacitors.

In Burst Mode® operation, supply current is only 33A, dropping to <1A in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3447 ideally suited for single cell Li-Ion battery-powered applications. 100% duty cycle capability provides low dropout operation, extending battery life in portable systems. Automatic Burst Mode operation increases effi ciency at light loads, further extending battery life.

The internal synchronous switch increases effi ciency and eliminates the need for an external Schottky diode.




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