Datasheet ADP7105 (Analog Devices) - 6

ADP7105 Data Sheet PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS VOUT 1 8 VIN VOUT 1 8 VIN SENSE/ADJ 2 ADP7105 7 PG SENSE/ADJ 2 ADP7105 7 PG TOP VIEW TOP VIEW GND 3 6 GND (Not to Scale) GND 3 6 GND (Not to Scale) SS 4 5 EN/UVLO SS 4 5 EN/UVLO NOTES NOTES 1. IT IS HIGHLY RECOMMENDED THAT THE 1. IT IS HIGHLY RECOMMENDED THAT THE EXPOSED PAD ON THE BOTTOM OF THE
003
EXPOSED PAD ON THE BOTTOM OF THE
004
PACKAGE BE CONNECTED TO THE GROUND PACKAGE BE CONNECTED TO THE GROUND PLANE ON THE BOARD.
1641- 1
PLANE ON THE BOARD.
1641- 1 Figure 3. Pin Configuration, LFCSP Package Figure 4. Pin Configuration, Narrow-Body SOIC Package
Table 5. Pin Function Descriptions Pin No. Mnemonic Description
1 VOUT Regulated Output Voltage. Bypass VOUT to GND with a 1 µF or greater capacitor. 2 SENSE/ADJ Sense (SENSE). SENSE measures the actual output voltage at the load and feeds it to the error amplifier. Connect SENSE as close as possible to the load to minimize the effect of IR drop between the regulator output and the load. This function applies to fixed voltage models only. Adjust Input (ADJ). An external resistor divider sets the output voltage. This function applies to adjustable voltage models only. 3 GND Ground. 4 SS Soft Start. A capacitor connected to this pin determines the soft start time. 5 EN/UVLO Enable Input (EN). Drive EN high to turn on the regulator; drive EN low to turn off the regulator. For automatic startup, connect EN to VIN. Programmable Undervoltage Lockout (UVLO). When the programmable UVLO function is used, the upper and lower thresholds are determined by the programming resistors. 6 GND Ground. 7 PG Power Good. This open-drain output requires an external pull-up resistor to VIN or VOUT. If the part is in shutdown mode, current-limit mode, or thermal shutdown, or if V falls below 90% OUT of the nominal output voltage, PG immediately transitions low. If the power-good function is not used, the pin can be left open or connected to ground. 8 VIN Regulator Input Supply. Bypass VIN to GND with a 1 µF or greater capacitor. EPAD Exposed Pad. The exposed pad on the bottom of the package enhances thermal performance and is electrically connected to GND inside the package. It is highly recommended that the exposed pad be connected to the ground plane on the board. Rev. C | Page 6 of 26 Document Outline Features Applications Typical Application Circuits General Description Table of Contents Revision History Specifications Input and Output Capacitor, Recommended Specifications Absolute Maximum Ratings Thermal Data Thermal Resistance ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Theory of Operation Applications Information Capacitor Selection Output Capacitor Input Bypass Capacitor Input and Output Capacitor Properties Programmable Undervoltage Lockout (UVLO) Soft Start Function Power-Good Feature Noise Reduction of the Adjustable ADP7105 Current-Limit and Thermal Overload Protection Thermal Considerations Printed Circuit Board Layout Considerations Outline Dimensions Ordering Guide