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New Low Voltage Step-Down Controller
Linear Technology has released a new step-down controller that can operate from as little as 3.3V
Linear Technology
Corporation has introduced the LTC1773, a current-mode
synchronous step-down controller that can operate from a
3.3V input supply. It delivers an output voltage range from
0.8V to VIN with an output current as high as 7A
at up to 95% efficiency. With a 550kHz operating frequency,
the LTC1773 minimizes the size of the inductor and
capacitors. This device is an excellent choice for
converting 1-cell Li-Ion or 3.3V input to low voltage output
commonly found in applications such as telecom line cards,
notebooks, PDAs and distributed power systems.
The LTC1773 also features OPTI-LOOP™ compensation, which
minimizes output capacitors. As a current-mode DC/DC
converter, the LTC1773 provides excellent line and load
transient response. This part offers the option of Burst
Mode™ operation for highest efficiency and forced continuous
mode for low noise operation at light load currents. With
100% duty cycle, the LTC1773 achieves very low dropout
operation, which extends operating time in battery-operated
systems. Systems that need to minimize the DC/DC converter’s
noise interference can synchronize the LTC1773 to a clock
frequency as high as 750kHz.
The LTC1773 is offered in small, low height 10-lead MSOP
package and is rated for a -40°C to 85°C temperature range.
Summary of Features: LTC1733
- High Efficiency up to 95%
- Constant Frequency 550kHz Operation
- VIN from 2.65V to 8.5V
- VOUT from 0.8V to VIN
- OPTI-LOOP Compensation Minimizes COUT
- Synchronizable up to 750kHz
- Selectable Burst Mode Operation
- Low Quiescent Current of 80µA
- ±1.5% Reference Accuracy
The company's Web site address is http://www.linear-tech.com/.
[Reprinted with kind permission from Linear Technology]
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