Datasheet ADP2164 (Analog Devices) - 6

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ADP2164 Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS N GOOD N P EN VI PVI 16 15 14 13 SYNC 1 12 PVIN RT 2 11 SW ADP2164 TOP VIEW TRK 3 (Not to Scale) 10 SW FB 4 9 SW 5 6 7 8 ND ND ND ND G G G G P P P NOTES 1. THE EXPOSED PAD SHOULD BE SOLDERED
003
TO AN EXTERNAL GROUND PLANE UNDER THE IC FOR THERMAL DISSIPATION.
09944- Figure 3. Pin Configuration
Table 4. Pin Function Descriptions Pin No. Mnemonic Description
1 SYNC Synchronization Input. To synchronize the switching frequency to an external clock, connect this pin to an external clock with a frequency of 500 kHz to 1.4 MHz (see the Oscillator and Synchronization section for more information). 2 RT Frequency Setting. To select a switching frequency of 600 kHz, connect this pin to GND; to select a switching frequency of 1.2 MHz, connect this pin to VIN. To program the frequency from 500 kHz to 1.4 MHz, connect a resistor from this pin to GND (see the Oscillator and Synchronization section for more information). 3 TRK Tracking Input. To track a master voltage, connect the TRK pin to a voltage divider from the master voltage. If the tracking function is not used, connect the TRK pin to VIN. For more information, see the Voltage Tracking section. 4 FB Feedback Voltage Sense Input. Connect this pin to a resistor divider from VOUT. For the preset output version, connect this pin directly to VOUT. 5 GND Analog Ground. Connect to the ground plane. 6, 7, 8 PGND Power Ground. Connect to the ground plane and to the output return side of the output capacitor. 9, 10, 11 SW Switch Node Output. Connect to the output inductor. 12, 13 PVIN Power Input Pin. Connect this pin to the input power source. Connect a bypass capacitor between this pin and PGND. 14 VIN Bias Voltage Input Pin. Connect a bypass capacitor between this pin and GND; connect a small (10 Ω) resistor between this pin and PVIN. 15 EN Precision Enable Pin. The external resistor divider can be used to set the turn-on threshold. To enable the part automatically, connect the EN pin to VIN. This pin has a 1 MΩ pull-down resistor to GND. 16 PGOOD Power-Good Output (Open Drain). Connect this pin to a resistor from any pull-up voltage lower than 6.5 V. 17 (EPAD) Exposed Pad The exposed pad should be soldered to an external ground plane under the IC for thermal dissipation. Rev. C | Page 6 of 19 Document Outline Features Applications Typical Applications Circuit General Description Revision History Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Functional Block Diagram Theory of Operation Control Scheme Slope Compensation Precision Enable/Shutdown Integrated Soft Start Oscillator and Synchronization Power Good Current Limit and Short-Circuit Protection Overvoltage Protection (OVP) Undervoltage Lockout (UVLO) Thermal Shutdown Applications Information ADIsimPower Design Tool Output Voltage Selection Inductor Selection Output Capacitor Selection Input Capacitor Selection Voltage Tracking Coincident Tracking Ratiometric Tracking Applications Circuits Outline Dimensions Ordering Guide