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LTC1682IS8 Datasheet(PDF) 10 Page - Linear Technology |
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LTC1682IS8 Datasheet(HTML) 10 Page - Linear Technology |
10 / 12 page 10 LTC1682/LTC1682-3.3/LTC1682-5 APPLICATIONS INFORMATION General Layout Considerations Due to the high switching frequency and high transient currents produced by the device, careful board layout is a must. A clean board layout using a ground plane and short connections to all capacitors will improve noise perfor- mance and ensure proper regulation (Figure 5). The FILT pin on the LTC1682-3.3/LTC1682-5 is a high impedance node. Leakage currents at this pin must be minimized. Measuring Output Noise Measuring the LTC1682 low noise levels requires care. Figure 6 shows a test setup for taking the measurement. Good connection and signal handling technique should yield about 500 µVP-P over a 2.5MHz bandwidth. The noise measurement involves AC coupling the LTC1682 output into the test setup’s input and terminating this connection with 50 Ω. Coaxial connections must be maintained to preserve measurement integrity. Power-On Reset Upon initial power-up, a power-on reset circuit ensures that the internal functions are correctly initialized when power is applied. Once VIN reaches approximately 1V, the power-on reset circuit will enable the part as long as the SHDN pin is held high. Thermal Considerations The power handling capability of the device will be limited by the maximum rated junction temperature (125 °C). The device power dissipation PD = IOUT(2VIN – VOUT) + VIN(4mA). The device dissipates the majority of its heat through its pins, especially GND (Pin 4). Thermal resis- tance to ambient can be optimized by connecting GND to a large copper region on the PCB, which serves as a heat sink. Applications which operate the LTC1682 near maxi- mum power levels should maximize the copper area at all pins except C+, C– and FILT/FB and ensure that there is some airflow over the part to carry away excess heat. 1 2 3 4 LTC1682-3.3/5 8 7 6 5 C1 VOUT VIN 1682 F05 C3 C2 GND SHDN C4 CFILT LTC1682 DEMO BOARD OSCILLOSCOPE BANDWIDTH FILTER CONNECT BNC AND RLOAD GROUND TO THE OUTPUT CAPACITOR GROUND TERMINAL E5 PLACE COUPLING CAPACITOR IN SHIELDED BOX WITH COAXIAL CONNECTOR COUPLING CAPACITOR BNC CABLES OR COUPLERS BATTERY OR LOW NOISE DC POWER SUPPLY VOUT RLOAD R* R* *50 Ω TERMINATIONS HP-11048C OR EQUIVALENT R* NOTE: KEEP BNC CONNECTIONS AS SHORT AS POSSIBLE PLACE BANDWIDTH FILTER COMPONENTS IN SHIELDED BOX WITH COAXIAL CONNECTORS PREAMPLIFIER 1822 INPUT 1682 F06 20dB Figure 6. LTC1682 Noise Measurement Test Setup Figure 5 |
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