Datasheet ADP2127 (Analog Devices) - 8

ADP2126/ADP2127 Data Sheet 1.2 450 TA = –40°C T I A = –40°C SW = 500mA TA = +25°C TA = +25°C 1.0 TA = +85°C 400 TA = +105°C A) ) Ω (µ 0.8 m 350 NT E N ( O S 0.6 CURR RD 300 N L W O D 0.4 HANNE 250 UT C H S N- 0.2 200 0 150 2.1 2.6 3.1 3.6 4.1 4.6 5.1
012
2.1 2.6 3.1 3.6 4.1 4.6 5.1
015 58- 58-
INPUT VOLTAGE (V) INPUT VOLTAGE (V)
096 096 Figure 11. Shutdown Current vs. Input Voltage Figure 14. NMOS Drain-to-Source On Resistance
500 400 T I A = –40°C SW = 500mA TA = +25°C A) µ 450 T ( 350 A = +105°C NT ) Ω RRE 400 m 300 N ( CU O NT 350 CE RDS 250 S L IE NE U Q 300 E 200 D -CHAN O P M M 250 F TA = –40°C 150 P TA = +25°C TA = +85°C 200 100 2.1 2.6 3.1 3.6 4.1 4.6 5.1
013
2.1 2.6 3.1 3.6 4.1 4.6 5.1
016 58- 58-
INPUT VOLTAGE (V) INPUT VOLTAGE (V)
096 096 Figure 12. PFM Mode Quiescent Current vs. Input Voltage Figure 15. PMOS Drain-to-Source On Resistance
17 ) OUTPUT VOLTAGE (200mV/DIV) A m 15 ( NT E 1 13 CURR NT E 11 C S E UI Q 9 INDUCTOR CURRENT (1A/DIV) DE O M M 7 T W A = –40°C P T 4 A = +25°C TA = +85°C
-017
5 2.1 2.6 3.1 3.6 4.1 4.6 5.1
14
TIME (200µs/DIV)
0 09658 58-
INPUT VOLTAGE (V)
096 Figure 13. PWM Mode Quiescent Current vs. Input Voltage Figure 16. Output Short-Circuit Response Rev. B | Page 8 of 20 Document Outline FEATURES APPLICATIONS TYPICAL APPLICATIONS CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING DIAGRAMS ABSOLUTE MAXIMUM RATINGS THERMAL CONSIDERATIONS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION OVERVIEW EXTERNAL CLOCK (EXTCLK) ENABLE SPREAD SPECTRUM OSCILLATOR MODE SELECTION Pulse-Width Modulation (PWM) Mode Auto Mode (PFM and PWM Switching) Pulse Frequency Modulation (PFM) Mode Mode Transition INTERNAL CONTROL FEATURES Synchronous Rectification Soft Start PROTECTION FEATURES Overcurrent Protection Output Short-Circuit Protection (SCP) Thermal Shutdown (TSD) Protection Undervoltage Lockout (UVLO) TIMING CONSTRAINTS Shutdown Time Power-Off Time APPLICATIONS INFORMATION INDUCTOR SELECTION INPUT CAPACITOR SELECTION OUTPUT CAPACITOR SELECTION THERMAL CONSIDERATIONS PCB LAYOUT GUIDELINES OUTLINE DIMENSIONS ORDERING GUIDE