Datasheet ADP5135 (Analog Devices) - 4

ADP5135 Data Sheet BUCK1, BUCK2, AND BUCK3
VAVIN = VIN1 = VIN2 = VIN3 = 3.0 V to 5.5 V; TJ = −40°C to +125°C for minimum/maximum specifications, and TA = 25°C for typical specifications, unless otherwise noted.1
Table 3. Parameter Symbol Test Conditions/Comments Min Typ Max Unit
OUTPUT CHARACTERISTICS Output Voltage Accuracy ΔVOUT1/VOUT1, ΔVOUT2/VOUT2, PWM mode; ILOAD1 = ILOAD2 = ILOAD3 = 0 mA −1.8 +1.8 % ΔVOUT3/VOUT3 Line Regulation (ΔVOUT1/VOUT1)/ΔVIN1, PWM mode −0.05 %/V (ΔVOUT2/VOUT2)/ΔVIN2, (ΔVOUT3/VOUT3)/ΔVIN3 Load Regulation (ΔVOUT1/VOUT1)/ΔIOUT1, ILOAD = 0 mA to 1800 mA, PWM mode −0.1 %/A (ΔVOUT2/VOUT2)/ΔIOUT2, (ΔVOUT3/VOUT3)/ΔIOUT3 VOLTAGE FEEDBACK VFB1, VFB2 Models with adjustable outputs 0.491 0.5 0.509 V OPERATING SUPPLY CURRENT MODE = ground BUCK1 Only IIN1 ILOAD1 = 0 mA, device not switching, all 42 μA other channels disabled BUCK2 Only IIN2 ILOAD2 = 0 mA, device not switching, all 52 μA other channels disabled BUCK3 Only IIN3 ILOAD3 = 0 mA, device not switching, all 52 μA other channels disabled BUCK1, BUCK2, and IIN ILOAD1 = ILOAD2 = ILOAD3 = 0 mA, device 85 μA BUCK3 not switching PSM CURRENT THRESHOLD IPSM PSM to PWM operation 100 mA SWx CHARACTERISTICS SWx On Resistance RNFET VIN1 = VIN2 = VIN3 = 3.6 V 140 225 mΩ RPFET VIN1 = VIN2 = VIN3 = 3.6 V 190 295 mΩ RNFET VIN1 = VIN2 = VIN3 = 5.5 V 122 189 mΩ RPFET VIN1 = VIN2 = VIN3 = 5.5 V 147 228 mΩ Current Limit ILIMIT1, ILIMIT2, ILIMIT3 Positive channel field effect transistor 2250 2600 2950 mA (PFET) switch peak current limit ACTIVE PULL-DOWN R VIN1 = VIN2 = VIN3 = 3.6 V; channel 75 Ω PWDN RESISTANCE disabled OSCILLATOR FREQUENCY fSW 2.5 3.0 3.5 MHz 1 All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC).
INPUT AND OUTPUT CAPACITORS, RECOMMENDED
TA = −40°C to +125°C, unless otherwise specified.
Table 4. Parameter Symbol Min Typ Max Unit
NOMINAL INPUT AND OUTPUT CAPACITOR RATINGS BUCK1, BUCK2, and BUCK3 Input Capacitor Ratings CMIN1, CMIN2, CMIN3 4.7 40 μF Output Capacitor Ratings CMIN4, CMIN5, CMIN6 10 40 μF CAPACITOR ESR RESR 0.001 1 Ω Rev. 0 | Page 4 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