Datasheet ADP5041 (Analog Devices) - 4

ADP5041 Data Sheet Parameter Min Typ Max Unit Test Conditions/Comments
WATCHDOG INPUT Watchdog Timeout Period Option 0 81.6 102 122.4 ms Option 1 1.28 1.6 1.92 sec WDI Pulse Width 80 ns VIL = 0.4 V, VIH = 1.2 V WDI Input Threshold 0.4 1.2 V WDI Input Current (Source) 8 15 20 µA VWDI = VCC, time average WDI Input Current (Sink) −30 −25 −15 µA VWDI = 0 V, time average MANUAL RESET INPUT MR Input Pulse Width 1 µs MR Glitch Rejection 220 ns MR Pull-Up Resistance 25 52 90 kΩ MR to Reset Delay 280 Ns VCC = 5 V
BUCK SPECIFICATIONS
AVIN, VIN1 = 2.3 V to 5.5 V; VOUT1 = 1.8 V; L = 1 µH; CIN = 10 µF; COUT = 10 µF; 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
INPUT CHARACTERISTICS Input Voltage Range VIN1 2.3 5.5 V OUTPUT CHARACTERISTICS Output Voltage Accuracy VOUT1 PWM mode, ILOAD = 0 mA to 1200 mA −3 +3 % Line Regulation (ΔVOUT1/VOUT1)/ΔVIN1 PWM mode −0.05 %/V Load Regulation (ΔVOUT1/VOUT1)/ΔIOUT1 ILOAD = 0 mA to 1200 mA, PWM mode −0.1 %/A VOLTAGE FEEDBACK VFB1 0.485 0.5 0.515 V PWM TO POWER SAVE MODE IPSM_L 100 mA CURRENT THRESHOLD INPUT CURRENT CHARACTERISTICS MODE = ground DC Operating Current INOLOAD ILOAD = 0 mA, device not switching, 21 35 μA all other channels disabled Shutdown Current ISHTD EN1 = 0 V, TA = TJ = −40°C to +125°C 0.2 1.0 μA SW CHARACTERISTICS SW On Resistance RPFET PFET, AVIN = VIN1 = 3.6 V 180 240 mΩ PFET, AVIN = VIN1 = 5 V 140 190 mΩ RNFET NFET, AVIN = VIN1 = 3.6 V 170 235 mΩ NFET, AVIN = VIN1 = 5 V 150 210 mΩ Current Limit ILIMIT PFET switch peak current limit 1600 1950 2300 mA ACTIVE PULL-DOWN EN1 = 0 V 85 Ω OSCILLATOR FREQUENCY fOSC 2.5 3.0 3.5 MHz 1 All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC). Rev. A | Page 4 of 40 Document Outline FEATURES FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS GENERAL SPECIFICATIONS SUPERVISORY SPECIFICATIONS BUCK SPECIFICATIONS LDO1, 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 Thermal Protection Undervoltage Lockout Enable/Shutdown Active Pull-Down BUCK SECTION Control Scheme PWM Mode Power Save Mode (PSM) PSM Current Threshold Short-Circuit Protection Soft Start Current Limit 100% Duty Operation LDO SECTION SUPERVISORY SECTION Reset Output Manual Reset Input Watchdog Input APPLICATIONS INFORMATION BUCK EXTERNAL COMPONENT SELECTION Feedback Resistors Inductor Output Capacitor Input Capacitor LDO EXTERNAL COMPONENT SELECTION Feedback Resistors OUTPUT CAPACITOR Input Bypass Capacitor Input and Output Capacitor Properties SUPERVISORY SECTION Threshold Setting Resistors Watchdog Input Current Negative-Going Transients at the Monitored Rail Watchdog Software Considerations POWER DISSIPATION/THERMAL CONSIDERATIONS Buck Regulator Power Dissipation LDO Regulator Power Dissipation Junction Temperature APPLICATION DIAGRAM PCB LAYOUT GUIDELINES SUGGESTED LAYOUT BILL OF MATERIALS FACTORY PROGRAMMABLE OPTIONS OUTLINE DIMENSIONS ORDERING GUIDE