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AAT1171 Datasheet(PDF) 2 Page - Advanced Analogic Technologies |
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AAT1171 Datasheet(HTML) 2 Page - Advanced Analogic Technologies |
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Pin Descriptions Pin Configuration TDFN33-12 (Top View) N/C VOUT VOUT 1 VCC AGND DAC LX PGND VIN MODE/SYNC BYPASS EN 2 3 4 5 6 12 11 10 9 8 7 Pin # Symbol Function 1 N/C Not connected. 2, 3 VOUT Feedback input pin. This pin is connected to the converter output. It is used to complete the control loop, regulating the output voltage to the desired value. When in bypass mode, a low resistance MOSFET is connected between this pin and VIN. 4 VCC Bias supply. Supply power for the internal circuitry. Connect to input power via low pass filter with decoupling to AGND. 5 AGND Analog ground. Connect the return of all small signal components to this pin. 6 DAC Control voltage input from a DAC. Input voltage between 0.2V and 1.2V to control output voltage of the converter. Force pin to 1.3V for bypass switch enable. 7 EN Enable DC/DC converter, active high. 8 BYPASS Enable control to bypass the DC/DC converter when PA transmitting at full power from low battery voltage. Active high. 9 MODE/SYNC This pin is used to program the device between PWM and LL mode: HIGH - PWM Mode Only LOW - LL Mode: PWM operation for loads above 100mA and variable switching frequen- cy for loads below 100mA Connecting the SYNC pin to the system clock (19.8MHz) will override the internal clock and force the switching frequency to the external clock frequency divided by 10. 10 VIN Input supply voltage for the converter. Must be closely decoupled. 11 PGND Main power ground. Connect to the output and input capacitor return. 12 LX Switching node. Connect the inductor to this pin. It is connected internally to the drain of both low- and high-side MOSFETs. EP Exposed paddle (bottom). Connect to ground directly beneath the package. AAT1171 600mA Voltage-Scaling Step-Down Converter for RF Power Amplifiers with Bypass Switch 2 1171.2006.06.1.0 |
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