Datasheet ADP5135 (Analog Devices) - 6

ADP5135 Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 3 3 T 3 3 U 3 3 D N N N B O I W G E F V V S P 4 3 2 1 0 2 2 2 2 9 2 1 PG3 1 18 AGND PG2 2 17 AVIN VIN2 3 ADP5135 16 VIN1 TOP VIEW SW2 4 15 SW1 (Not to Scale) PGND2 5 14 PGND1 PG1 6 13 MODE 7 8 9 01 11 21 2 2 2 1 1 1 N B T T B N E F U U F E O O V V NOTES
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1. SOLDER THE EXPOSED PAD TO THE GROUND PLANE WITH SEVERAL VIAS.
12604 Figure 2. Pin Configuration—View from the Top of the Die
Table 7. Pin Function Descriptions Pin No. Mnemonic Description
1 PG3 Open-Drain Power-Good Output to Monitor the Output Voltage of BUCK3. 2 PG2 Open-Drain Power-Good Output to Monitor the Output Voltage of BUCK2. 3 VIN2 BUCK2 Input Supply (3.0 V to 5.5 V). Connect VIN2 to VIN1, VIN3, and AVIN. 4 SW2 BUCK2 Switching Node. 5 PGND2 Dedicated Power Ground for BUCK2. 6 PG1 Open-Drain Power-Good Output to Monitor the Output Voltage of BUCK1. 7 EN2 BUCK2 Enable. A high level turns on this regulator, and a low level turns it off. 8 FB2 BUCK2 Feedback Input. For device models with an adjustable output voltage, connect this pin to the middle of the BUCK2 resistor divider. For device models with a fixed output voltage, leave this pin unconnected. 9 VOUT2 BUCK2 Output Voltage Sensing Input. Connect VOUT2 to the top of the capacitor on VOUT2. 10 VOUT1 BUCK1 Output Voltage Sensing Input. Connect VOUT1 to the top of the capacitor on VOUT1. 11 FB1 BUCK1 Feedback Input. For device models with an adjustable output voltage, connect this pin to the middle of the BUCK1 resistor divider. For device models with a fixed output voltage, leave this pin unconnected. 12 EN1 BUCK1 Enable. A high level turns on this regulator, and a low level turns it off. 13 MODE BUCK1/BUCK2 Operating Mode. MODE = high: forced PWM operation. MODE = low: auto PWM/PSM operation. 14 PGND1 Dedicated Power Ground for BUCK1. 15 SW1 BUCK1 Switching Node. 16 VIN1 BUCK1 Input Supply (3.0 V to 5.5 V). Connect VIN1 to VIN2, VIN3, and AVIN. 17 AVIN Analog Input Supply (3.0 V to 5.5 V). Connect AVIN to VIN1, VIN2, and VIN3. 18 AGND Analog Ground. 19 PGND3 Dedicated Power Ground for BUCK3. 20 SW3 BUCK3 Switching Node. 21 VIN3 BUCK3 Input Supply (3.0 V to 5.5 V). Connect VIN3 to VIN1, VIN2 and AVIN. 22 VOUT3 BUCK3 Output Voltage Sensing Input. Connect VOUT3 to the top of the capacitor on VOUT3. 23 FB3 BUCK3 Feedback Input. For device models with an adjustable output voltage, connect this pin to the middle of the BUCK3 resistor divider. For device models with a fixed output voltage, leave this pin unconnected. 24 EN3 BUCK3 Enable. A high level turns on this regulator, and a low level turns it off. EP Exposed Pad. Solder the exposed pad to the ground plane. Rev. 0 | Page 6 of 24 Document Outline Features Applications Typical Application Circuit General Description Revision History Specifications BUCK1, BUCK2, and BUCK3 Input and Output Capacitors, Recommended Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Power Management Unit Power-Good Output Thermal Protection Undervoltage Lockout Precision Enable and Shutdown Control Buck Regulators: BUCK1, BUCK2, AND BUCK3 Control Scheme PWM Mode Power Save Mode (PSM) PSM Current Threshold Oscillator/Phasing of Inductor Switching Short-Circuit Protection Buck Regulator Soft Start Current Limit 100% Duty Operation Active Pull-Down Resistors Applications Information Buck External Component Selection Feedback Resistors Inductor Output Capacitor Input Capacitor Typical Application Schematics Power Dissipation and Thermal Considerations Buck Regulator Power Dissipation Junction Temperature PCB Layout Guidelines Outline Dimensions Ordering Guide