Datasheet ADP2370, ADP2371 (Analog Devices) - 3

Data Sheet ADP2370/ADP2371 SPECIFICATIONS
VIN = VOUT + 1 V or 3.2 V, whichever is greater, EN = VIN, IOUT = 100 mA, CIN = 10 μF, COUT = 10 µF, TA = 25°C for typical specifications, TJ = −40°C to +125°C for minimum/maximum specifications, unless otherwise noted.
Table 1. Parameter Symbol Test Conditions/Comments Min Typ Max Unit
SUPPLY Input Voltage Range VIN 3.2 15 V Quiescent Current IQ-PSM FSEL = VIN, SYNC = 0 V, no load, device not 13.5 μA switching IQ-PWM FSEL = VIN, SYNC = VIN, no load, device not 725 μA switching ISW-PWM FSEL = VIN, SYNC = VIN, no load, device switching 5.7 mA Shutdown Current ISHUT EN = GND, TJ = −40°C to +85°C 1.2 3.5 μA FIXED OUTPUT Output Current IOUT 800 mA Fixed Output Accuracy VOUT Initial set point, IOUT = 250 mA, TJ = 25°C −1 +1 % IOUT = 250 mA −1.5 +1.5 % No load to ful load, PWM mode −3 +3 % ADJUSTABLE OUTPUT Feedback Voltage VFB 0.8 V Feedback Voltage Accuracy VFB-TOL Initial set point, IOUT = 250 mA, TJ = 25°C −1 +1 % Output Voltage Range VOUT-ADJ No load to full load 0.8 14 V FIXED AND ADJUSTABLE OUTPUT Load Regulation ∆VOUT/∆IOUT No load to full load 0.125 %/A Line Regulation ∆VOUT/∆VIN IOUT = 250 mA 0.01 %/V Efficiency EFF IOUT = 250 mA, VIN = 7.2 V, VOUT = 3.3 V 92 % Overcurrent Frequency Foldback Threshold Rising OCFOLDBACK-RISE % of VOUT, VOUT rising 50 % Falling OCFOLDBACK-FALL % of VOUT, VOUT falling 37.5 % PSM Threshold PSMTHRESHOLD VIN = 7.2 V, VOUT = 3.3 V 170 mA Feedback Pin Input Current Fixed IFB-FIXED Fixed output voltage model 2.5 μA Adjustable IFB-ADJUST Adjustable output voltage model 10 nA Minimum On Time ON-TIMEMIN VIN < 5.5 V 65 100 ns VIN > 5.5 V 40 60 ns Soft Start Time SSTIME When EN rises from 0 V to VIN, and VOUT = 0.9 × VOUT 350 μs Active Pull-Down Resistance RPULL-DOWN 260 400 Ω (ADP2371) POWER SWITCH P-Channel On Resistance RDSON-P VIN > 5.5 V, IOUT = 400 mA 400 mΩ VIN < 5.5 V, IOUT = 400 mA 500 mΩ N-Channel On Resistance RDSON-N VIN > 5.5 V, IOUT = 400 mA 280 mΩ VIN < 5.5 V, IOUT = 400 mA 400 mΩ Current Limit P-Channel ILIM-P Peak inductor current 1200 1300 mA N-Channel ILIM-N Peak inductor current 500 550 mA Leakage Current ILEAK-SW P-Channel 0.01 1 μA N-Channel 0.01 1 μA Rev. D | Page 3 of 32 Document Outline Features Applications Typical Application Circuit General Description Table of Contents Revision History Specifications Recommended Specifications: Capacitors Absolute Maximum Ratings Thermal Data Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Buck Output Theory of Operation PWM Operation PSM Operation Features Descriptions Precision Enable Forced PWM or PWM/PSM Selection Quick Output Discharge (QOD) Function Short-Circuit Protection Undervoltage Lockout Thermal Protection Soft Start Current Limit 100% Duty Cycle Synchronizing Power Good Applications Information ADIsimPower Design Tool External Component Selection Selecting the Inductor Output Capacitor Input Capacitor Adjustable Output Voltage Programming Efficiency Power Switch Conduction Losses Inductor Losses Switching Losses Transition Losses Recommended Buck External Components Capacitor Selection Output Capacitor Input Bypass Capacitor Input and Output Capacitor Properties Thermal Considerations PCB Layout Considerations Packaging and Ordering Information Outline Dimensions Ordering Guide