Datasheet ADP2302, ADP2303 (Analog Devices) - 5

Data Sheet ADP2302/ADP2303 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS BST 1 8 SW ADP2302 VIN 2 7 GND ADP2303 EN 3 TOP VIEW 6 NC PGOOD 4 (Not to Scale) 5 FB NOTES 1. NC = NO CONNECT. 2. THE EXPOSED PAD SHOULD BE SOLDERED
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TO AN EXTERNAL GROUND PLANE UNDERNEATH
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THE IC FOR THERMAL DISSIPATION.
33 088 Figure 3. Pin Configuration (Top View)
Table 4. Pin Function Descriptions Pin No. Mnemonic Description
1 BST Bootstrap Supply for the High-Side MOSFET Driver. A 0.1 μF capacitor is connected between SW and BST to provide a floating driver voltage for the power switch. 2 VIN Power Input. Connect to the input power source with a ceramic bypass capacitor to GND directly from this pin. 3 EN Output Enable. Pull this pin high to enable the output. Pull this pin low to disable the output. This pin can also be used as a programmable UVLO input. This pin has an internal 1.2 μA pull-down current to GND. 4 PGOOD Power-Good Open-Drain Output. 5 FB Feedback Voltage Sense Input. For the adjustable version, connect this pin to a resistive divider from VOUT. For the fixed output version, connect this pin to VOUT directly. 6 NC Used for internal testing. Connect to GND or leave this pin floating to ensure proper operation. 7 GND Ground. Connect this pin to the ground plane. 8 SW Switch Node Output. Connect an inductor to VOUT and a catch diode to GND from this pin. 9 (EPAD) Exposed Pad The exposed pad should be soldered to an external ground plane underneath the IC for thermal dissipation. Rev. A | Page 5 of 28 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 Basic Operation PWM Mode Power Saving Mode Bootstrap Circuitry Precision Enable Integrated Soft Start Current Limit Short-Circuit Protection Undervoltage Lockout (UVLO) Thermal Shutdown (TSD) Overvoltage Protection (OVP) Power Good Control Loop Applications Information ADIsimPower Design Tool Programming Output Voltage Voltage Conversion Limitations Low Input Voltage Considerations Programming the Precision Enable Inductor Catch Diode Input Capacitor Output Capacitor Thermal Consideration Design Example Catch Diode Selection Inductor Selection Output Capacitor Selection Resistive Voltage Divider Selection Circuit Board Layout Recommendations Typical Application Circuits Outline Dimensions Ordering Guide