Datasheet ADP2325 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Dual 5 A, 20 V Synchronous Step-Down Regulator with Integrated High-Side MOSFET |
| Pages / Page | 32 / 4 — ADP2325. Data Sheet. SPECIFICATIONS. Table 1. Parameters. Symbol Test … |
| Revision | A |
| File Format / Size | PDF / 810 Kb |
| Document Language | English |
ADP2325. Data Sheet. SPECIFICATIONS. Table 1. Parameters. Symbol Test Conditions/Comments. Min. Typ Max. Unit
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ADP2325 Data Sheet SPECIFICATIONS
PVIN1 = PVIN2 = 12 V at TJ = −40°C to +125°C, unless otherwise noted.
Table 1. Parameters Symbol Test Conditions/Comments Min Typ Max Unit
POWER INPUT (PVINx PINS) Power Input Voltage Range V 4.5 20 V PVIN Quiescent Current (PVIN1 + PVIN2) I MODE = GND, no switching 3 5 mA Q Shutdown Current (PVIN1 + PVIN2) I EN1 = EN2 = GND 30 40 µA SHDN PVINx Undervoltage Lockout Threshold UVLO PVINx Rising 4.2 4.4 V PVINx Falling 3.5 3.7 V FEEDBACK (FBx PINS) FBx Regulation Voltage1 V PVINx = 4.5 V to 20 V 0.594 0.6 0.606 V FB FBx Bias Current I 0.01 0.1 µA FB ERROR AMPLIFIER (COMPx PINS) Transconductance g 370 500 630 µS m Error Amplifier Source Current I 40 65 90 µA SOURCE Error Amplifier Sink Current I 45 65 85 µA SINK INTERNAL REGULATOR (INTVCC PIN) INTVCC Voltage 4.75 5 5.25 V Dropout Voltage I = 30 mA 300 mV INTVCC Regulator Current Limit 80 100 120 mA SWITCH NODE (SWx PINS) High-Side On Resistance2 V to V = 5 V 48 80 mΩ BST SW High-Side Peak Current Limit R = floating, V to V = 5 V 6.4 8 9.6 A ILIM BST SW R = 47 kΩ, V to V = 5 V 3.4 4.8 6.2 A ILIM BST SW Low-Side Negative Current-Limit Threshold 50 mV Voltage3 SWx Minimum On Time3 t 130 ns MIN_ON SWx Minimum Off Time3 t 150 ns MIN_OFF LOW-SIDE DRIVER (DLx PINS) Rising Time3 t C = 2.2 nF, see Figure 23 20 ns R DL Falling Time3 t C = 2.2 nF, see Figure 26 10 ns F DL Sourcing Resistor 4 6 Ω Sinking Resistor 1.4 3 Ω OSCILLATOR (RT PIN) PWM Switching Frequency f R = 100 kΩ 510 600 690 kHz SW OSC PWM Frequency Range 250 1200 kHz SYNCHRONIZATION (SYNC PIN) SYNC Input SYNC configured as input Synchronization Range 300 1200 kHz Minimum On Pulse Width 100 ns Minimum Off Pulse Width 100 ns High Threshold 1.3 V Low Threshold 0.4 V SYNC Output SYNC configured as output Frequency on SYNC Pin f f kHz CLKOUT SW Positive Pulse Time 100 ns SOFT START (SSx PINS) SSx Pin Source Current I 2.5 3.5 4.5 µA SS Rev. A | Page 4 of 32 Document Outline Features Applications Typical Application Circuit General Description Revision History Functional Block Diagram Specifications Absolute Maximum Ratings Thermal Resistance Boundary Condition ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Control Scheme PWM Mode PFM Mode Precision Enable/Shutdown Separate Input Voltages Internal Regulator (INTVCC) Bootstrap Circuitry Low-Side Driver Oscillator Synchronization Soft Start Peak Current-Limit and Short-Circuit Protection Voltage Tracking Coincident Tracking Ratiometric Tracking Parallel Operation Power Good Overvoltage Protection Undervoltage Lockout Thermal Shutdown Applications Information ADIsimPower Design Tool Input Capacitor Selection Output Voltage Setting Voltage Conversion Limitations Current-Limit Setting Inductor Selection Output Capacitor Selection Low-Side Power Device Selection Programming the UVLO Input Compensation Components Design Design Example Output Voltage Setting Current-Limit Setting Frequency Setting Inductor Selection Output Capacitor Selection Low-Side MOSFET Selection Compensation Components Soft Start Time Programming Input Capacitor Selection External Components Recommendations Typical Application Circuits Packaging and Ordering Information Outline Dimensions Ordering Guide
ADP2325 Data Sheet SPECIFICATIONS
PVIN1 = PVIN2 = 12 V at TJ = −40°C to +125°C, unless otherwise noted.
Table 1. Parameters Symbol Test Conditions/Comments Min Typ Max Unit
POWER INPUT (PVINx PINS) Power Input Voltage Range V 4.5 20 V PVIN Quiescent Current (PVIN1 + PVIN2) I MODE = GND, no switching 3 5 mA Q Shutdown Current (PVIN1 + PVIN2) I EN1 = EN2 = GND 30 40 µA SHDN PVINx Undervoltage Lockout Threshold UVLO PVINx Rising 4.2 4.4 V PVINx Falling 3.5 3.7 V FEEDBACK (FBx PINS) FBx Regulation Voltage1 V PVINx = 4.5 V to 20 V 0.594 0.6 0.606 V FB FBx Bias Current I 0.01 0.1 µA FB ERROR AMPLIFIER (COMPx PINS) Transconductance g 370 500 630 µS m Error Amplifier Source Current I 40 65 90 µA SOURCE Error Amplifier Sink Current I 45 65 85 µA SINK INTERNAL REGULATOR (INTVCC PIN) INTVCC Voltage 4.75 5 5.25 V Dropout Voltage I = 30 mA 300 mV INTVCC Regulator Current Limit 80 100 120 mA SWITCH NODE (SWx PINS) High-Side On Resistance2 V to V = 5 V 48 80 mΩ BST SW High-Side Peak Current Limit R = floating, V to V = 5 V 6.4 8 9.6 A ILIM BST SW R = 47 kΩ, V to V = 5 V 3.4 4.8 6.2 A ILIM BST SW Low-Side Negative Current-Limit Threshold 50 mV Voltage3 SWx Minimum On Time3 t 130 ns MIN_ON SWx Minimum Off Time3 t 150 ns MIN_OFF LOW-SIDE DRIVER (DLx PINS) Rising Time3 t C = 2.2 nF, see Figure 23 20 ns R DL Falling Time3 t C = 2.2 nF, see Figure 26 10 ns F DL Sourcing Resistor 4 6 Ω Sinking Resistor 1.4 3 Ω OSCILLATOR (RT PIN) PWM Switching Frequency f R = 100 kΩ 510 600 690 kHz SW OSC PWM Frequency Range 250 1200 kHz SYNCHRONIZATION (SYNC PIN) SYNC Input SYNC configured as input Synchronization Range 300 1200 kHz Minimum On Pulse Width 100 ns Minimum Off Pulse Width 100 ns High Threshold 1.3 V Low Threshold 0.4 V SYNC Output SYNC configured as output Frequency on SYNC Pin f f kHz CLKOUT SW Positive Pulse Time 100 ns SOFT START (SSx PINS) SSx Pin Source Current I 2.5 3.5 4.5 µA SS Rev. A | Page 4 of 32 Document Outline Features Applications Typical Application Circuit General Description Revision History Functional Block Diagram Specifications Absolute Maximum Ratings Thermal Resistance Boundary Condition ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Control Scheme PWM Mode PFM Mode Precision Enable/Shutdown Separate Input Voltages Internal Regulator (INTVCC) Bootstrap Circuitry Low-Side Driver Oscillator Synchronization Soft Start Peak Current-Limit and Short-Circuit Protection Voltage Tracking Coincident Tracking Ratiometric Tracking Parallel Operation Power Good Overvoltage Protection Undervoltage Lockout Thermal Shutdown Applications Information ADIsimPower Design Tool Input Capacitor Selection Output Voltage Setting Voltage Conversion Limitations Current-Limit Setting Inductor Selection Output Capacitor Selection Low-Side Power Device Selection Programming the UVLO Input Compensation Components Design Design Example Output Voltage Setting Current-Limit Setting Frequency Setting Inductor Selection Output Capacitor Selection Low-Side MOSFET Selection Compensation Components Soft Start Time Programming Input Capacitor Selection External Components Recommendations Typical Application Circuits Packaging and Ordering Information Outline Dimensions Ordering Guide
