Datasheet ADP5075 (Analog Devices) - 6

ADP5075 Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS BALL A1 INDICATOR 1 2 3 A AVIN PVIN SW B VREG SLEW SS C GND SYNC/FREQ EN D
002 9-
VREF FB COMP
1281
TOP VIEW (BALL SIDE DOWN) Not to Scale
Figure 2. Pin Configuration
Table 5. Pin Function Descriptions Pin No. Mnemonic Description
A1 AVIN System Power Supply for the ADP5075. A2 PVIN Power Input for the Inverting Regulator. A3 SW Switching Node for the Inverting Regulator. B1 VREG Internal Regulator Output. Connect a 1.0 μF ceramic filter capacitor between the VREG pin and GND. B2 SLEW Driver Stage Slew Rate Control. The SLEW pin sets the slew rate for the FET driving the SW pin. For the fastest slew rate (best efficiency), leave the SLEW pin open. For a normal slew rate, connect the SLEW pin to VREG. For the slowest slew rate (best noise performance), connect the SLEW pin to ground. B3 SS Soft Start Programming. Leave the SS pin open to obtain the fastest soft start time. To program a slower soft start time, connect a resistor between the SS pin and GND. C1 GND Ground. C2 SYNC/FREQ Frequency Setting and Synchronization Input. To set the switching frequency to 2.4 MHz, pull the SYNC/FREQ pin high. To set the switching frequency to 1.2 MHz, pull the SYNC/FREQ pin low. To synchronize the switching frequency, connect the SYNC/FREQ pin to an external clock. C3 EN Inverting Regulator Precision Enable. The EN pin is compared to an internal precision reference to enable the inverting regulator output. D1 VREF Inverting Regulator Reference Output. Connect a 1.0 μF ceramic filter capacitor between the VREF pin and ground. D2 FB Feedback Input for the Inverting Regulator. Connect a resistor divider between the negative side of the inverting regulator output capacitor and VREF to program the output voltage. D3 COMP Error Amplifier Compensation for the Inverting Regulator. Connect the compensation network between this pin and GND. Rev. B | Page 6 of 19 Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUIT GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION PWM MODE PSM MODE UNDERVOLTAGE LOCKOUT (UVLO) OSCILLATOR AND SYNCHRONIZATION INTERNAL REGULATORS PRECISION ENABLING SOFT START SLEW RATE CONTROL CURRENT-LIMIT PROTECTION OVERVOLTAGE PROTECTION THERMAL SHUTDOWN APPLICATIONS INFORMATION ADIsimPOWER DESIGN TOOL COMPONENT SELECTION Feedback Resistors Output Capacitor Input Capacitor VREG Capacitor VREF Capacitor Soft Start Resistor Diodes Inductor Selection Loop Compensation COMMON APPLICATIONS LAYOUT CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE