Datasheet ADP5074 (Analog Devices) - 6

ADP5074 Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS IN IC IC IC V N N N A 16 15 14 13 SW 1 12 PVIN SLEW 2 11 VREG ADP5074 PWRGD 3 TOP VIEW 10 GND (Not to Scale) SYNC/FREQ 4 9 VREF 5 6 7 8 P SS EN M FB CO NOTES.
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1. NIC = NO INTERNAL CONNECTION. FOR IMPROVED THERMAL
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PERFORMANCE, CONNECT THESE PINS TO THE PCB GROUND PLANE.
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2. EXPOSED PAD. CONNECT THE EXPOSED PAD TO GND.
12 Figure 2. Pin Configuration
Table 5. Pin Function Descriptions Pin No. Mnemonic Description
1 SW Switching Node for the Inverting Regulator. 2 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 GND. 3 PWRGD Power-Good Output (Open-Drain). Pull this pin up to VREG with a resistor to provide a high output when power is good. 4 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. 5 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. 6 EN Inverting Regulator Precision Enable. The EN pin is compared to an internal precision reference to enable the inverting regulator output. 7 COMP Error Amplifier Compensation for the Inverting Regulator. Connect the compensation network between this pin and GND. 8 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. 9 VREF Inverting Regulator Reference Output. Connect a 1.0 μF ceramic filter capacitor between the VREF pin and GND. 10 GND Ground. 11 VREG Internal Regulator Output. Connect a 1.0 μF ceramic filter capacitor between the VREG pin and GND. 12 PVIN Power Input for the Inverting Regulator. 13 AVIN System Power Supply for the ADP5074. 14, 15, 16 NIC No Internal Connection. For improved thermal performance, connect these pins to the PCB ground plane. EPAD EPAD Exposed Pad. Connect the exposed pad to GND. Rev. A | Page 6 of 17 Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION PWM MODE SKIP MODE UNDERVOLTAGE LOCKOUT (UVLO) OSCILLATOR AND SYNCHRONIZATION INTERNAL REGULATORS PRECISION ENABLING SOFT START SLEW RATE CONTROL CURRENT-LIMIT PROTECTION OVERVOLTAGE PROTECTION POWER GOOD 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