Datasheet ADP1876 (Analog Devices) - 10

link to page 23 link to page 23
ADP1876 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS
Test conditions are at TA = 25°C and VIN = 12 V, unless otherwise specified.
100 6 90 5 80 VOUT = 1.8V VOUT = 5V 70 4 %) ( 60 Y C (V) N 50 O 3 IE C VC 40 FFIC E 2 30 20 1 10 VIN = 12V 0 0 0 2 4 6 8 10 12 14 0 1 2 3 4 5 6
004 007
LOAD (A) VIN (V)
10103- 10103- Figure 4. Efficiency Plot of Figure 33 Figure 7. VCCO vs. VIN
0 –0.05 VOUT1 = 5V OUTPUT RESPONSE 3 –0.10 (V) O C 50mA LOAD ΔVC –0.15 OUTPUT STEP LOAD = 5A TO 10A 100mA LOAD –0.20
008
1
10103-
–0.25 2.5 3.0 3.5 4.0 4.5 5.0 CH1 5.00A Ω M100µs A CH1 9.00A
005
CH3 20.0mV VIN (V)
10103- Figure 5. VCCO Dropout Figure 8. Step Load Transient of Figure 33
5.10 5.05 NO LOAD ON LDO 5.00 DH1 100mA LOAD ON LDO 1 4.95 DL1 (V) 2 4.90 O C VC 4.85 VOUT1 Δ 4.80 3 IL1 4 4.75 VIN = 12V 4.70 VOUT = 1.8V OUTPUT PRECHARGED TO 1V 4.65
009
5 7 9 11 13 15 17 CH1 5V CH2 5V M1ms A CH1 2.4V
006
CH3 1V CH4 1A Ω V
10103-
IN (V)
10103- Figure 6. VCCO Line Regulation Figure 9. Soft Start Into Precharged Output Rev. B | Page 10 of 24 Document Outline FEATURES APPLICATIONS TYPICAL OPERATION CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION INDEPENDENT LOW DROPOUT LINEAR REGULATOR CONTROLLER ARCHITECTURE Synchronous Rectifier and Dead Time INPUT UNDERVOLTAGE LOCKOUT INTERNAL LINEAR REGULATOR (VCCO) OVERVOLTAGE PROTECTION POWER GOOD SHORT-CIRCUIT AND CURRENT-LIMIT PROTECTION SHUTDOWN CONTROL THERMAL OVERLOAD PROTECTION APPLICATIONS INFORMATION INDEPENDENT LOW DROPOUT LINEAR REGULATOR SETTING THE OUTPUT VOLTAGE OF THE CONTROLLER SOFT START SETTING THE CURRENT LIMIT ACCURATE CURRENT-LIMIT SENSING SETTING THE SLOPE COMPENSATION SETTING THE CURRENT SENSE GAIN INPUT CAPACITOR SELECTION INPUT FILTER BOOST CAPACITOR SELECTION INDUCTOR SELECTION OUTPUT CAPACITOR SELECTION MOSFET SELECTION LOOP COMPENSATION SWITCHING NOISE AND OVERSHOOT REDUCTION PCB LAYOUT GUIDELINE TYPICAL APPLICATIONS CIRCUIT PACKAGING AND ORDERING INFORMATION OUTLINE DIMENSIONS ORDERING GUIDE