Datasheet ADP5134 (Analog Devices) - 7

Data Sheet ADP5134 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 4 3 T T 4 3 U 3 U 3 N N O I N I O B V V E V V F 4 3 2 1 0 2 2 2 2 9 2 1 FB4 1 18 AGND EN4 2 17 AVIN VIN2 3 ADP5134 16 VIN1 TOP VIEW SW2 4 15 SW1 (Not to Scale) PGND2 5 14 PGND1 PG 6 13 MODE 7 8 9 0 1 2 1 1 1 2 2 2 1 1 1 N B T T B N E F U U F E O O V V
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NOTES 1. SOLDER THE EXPOSED PAD TO THE GROUND PLANE.
11710 Figure 2. Pin Configuration
Table 8. Pin Function Descriptions Pin No. Mnemonic Description
1 FB4 LDO2 Feedback Input. For device models with an adjustable output voltage, connect this pin to the middle of the LDO2 resistor divider. For device models with a factory programmed output voltage, connect FB4 to the top of the capacitor on VOUT4. 2 EN4 LDO2 Enable Pin. When EN4 is set to high, it turns the regulator on. When EN4 is set to low, it turns the regulator off. 3 VIN2 BUCK2 Input Supply (2.5 V to 5.5 V). Connect VIN2 to VIN1 and AVIN. 4 SW2 BUCK2 Switching Node. 5 PGND2 Dedicated Power Ground for BUCK2. 6 PG Power-Good Pin Output. Factory selectable to monitor the output voltage of up to four regulators. 7 EN2 BUCK2 Enable Pin. When EN2 is set to high, it turns the regulator on. When EN2 is set to low, it turns the regulator 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 BUCK2 output capacitor. 10 VOUT1 BUCK1 Output Voltage Sensing Input. Connect VOUT1 to the top of the BUCK1 output capacitor. 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 Pin. When EN1 is set to high, it turns the regulator on. When EN1 is set to low, it turns the regulator off. 13 MODE BUCK1/BUCK2 Operating Mode. When MODE is set to high, the device is set to forced PWM operation. When MODE is set to low, the device is automatically set to PWM/PSM operation. 14 PGND1 Dedicated Power Ground for BUCK1. 15 SW1 BUCK1 Switching Node. 16 VIN1 BUCK1 Input Supply (2.5 V to 5.5 V). Connect VIN1 to VIN2 and AVIN. 17 AVIN Analog Input Supply (2.5 V to 5.5 V). Connect AVIN to VIN1 and VIN2. 18 AGND Analog Ground. 19 FB3 LDO1 Feedback Input. For device models with an adjustable output voltage, connect this pin to the middle of the LDO1 resistor divider. For device models with a factory programmed output voltage, connect FB3 to the top of the capacitor on VOUT3. 20 VOUT3 LDO1 Output Voltage. 21 VIN3 LDO1 Input Supply (1.7 V to 5.5 V). 22 EN3 LDO1 Enable Pin. When EN3 is set to high, it turns on the regulator, and when EN3 is set to low, it turns off the regulator. 23 VIN4 LDO2 Input Supply (1.7 V to 5.5 V). 24 VOUT4 LDO2 Output Voltage. EP Exposed Pad. Solder the exposed pad to the ground plane. Rev. A | Page 7 of 28 Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUIT GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS GENERAL SPECIFICATIONS BUCK1 AND BUCK2 SPECIFICATIONS LDO1 AND LDO2 SPECIFICATIONS INPUT AND OUTPUT CAPACITOR, RECOMMENDED SPECIFICATIONS 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 BUCK1 AND BUCK2 Control Scheme PWM Mode Power Save Mode (PSM) PSM Current Threshold Oscillator and Phasing of Inductor Switching Short-Circuit Protection Buck Regulator Soft Start Current Limit 100% Duty Operation Active Pull-Down Resistors LDO1 AND LDO2 LDO Regulator Soft Start APPLICATIONS INFORMATION BUCK REGULATOR EXTERNAL COMPONENT SELECTION Feedback Resistors Inductor Output Capacitor Input Capacitor LDO REGULATOR EXTERNAL COMPONENT SELECTION Feedback Resistors Output Capacitor Input Bypass Capacitor Input and Output Capacitor Properties POWER DISSIPATION AND THERMAL CONSIDERATIONS BUCK REGULATOR POWER DISSIPATION LDO Regulator Power Dissipation JUNCTION TEMPERATURE PCB LAYOUT GUIDELINES TYPICAL APPLICATION SCHEMATICS BILL OF MATERIALS OUTLINE DIMENSIONS ORDERING GUIDE