Datasheet ADP2127 (Analog Devices) - 7

Data Sheet ADP2126/ADP2127 TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.6 V, fEXTCLK = 10 MHz, VOUT = 1.20 V, L = 1.0 μH (CKP1608S1R0), CIN = 2.2 μF (GRM153R60J225ME95), COUT = 2.2 μF (GRM153R60G225M), and TA = 25°C, unless otherwise noted.
90 1.205 AUTO MODE 80 70 ) ) 60 (V 1.204 E (% G Y A 50 C N LT O IE C 40 V T U FFI PWM MODE E 30 TP 1.203 U O V V 20 IN = 2.1V IN = 2.1V VIN = 2.5V VIN = 2.5V VIN = 3.6V VIN = 3.6V 10 VIN = 4.2V VIN = 4.2V VIN = 5.5V VIN = 5.5V 0 1.202 1 10 100 1000
06 09 0
1 10 100 1000
0 8- 8-
LOAD CURRENT (mA)
965
LOAD CURRENT (mA)
965 0 0 Figure 5. Efficiency vs. Load Current Figure 8. PWM Mode Output Voltage Accuracy
90 250 80 200 PWM OPERATION ) 70 A) (% (m Y 150 C NT 60 IEN IC F 100 EF 50 AD CURRE I O LOAD = 50mA, PWM MODE L PFM OPERATION ILOAD = 100mA, PWM MODE I 50 40 LOAD = 10mA, PFM MODE ILOAD = 50mA, PFM MODE ILOAD = 100mA, PFM MODE ILOAD = 250mA, PFM MODE 30 0
0
2.1 2.6 3.1 3.6 4.1 4.6 5.1
007
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
-01 58-
INPUT VOLTAGE (V) INPUT VOLTAGE (V)
658 096 09 Figure 6. Efficiency vs. Input Voltage Figure 9. Auto Mode Switching Threshold vs. Input Voltage
1.24 60 VIN = 2.1V VIN = 2.1V VIN = 2.5V VIN = 3.6V V V IN = 3.6V 50 IN = 5.5V 1.23 VIN = 4.2V V) m ) VIN = 5.5V E ( (V E 40 G 1.22 IPPL A LT E R O G 30 V A T T L U 1.21 TP VO U T 20 O PU T 1.20 U O 10 1.19 0 1 10 100 1000
08 0
0 100 200 300 400 500
011 8-
LOAD CURRENT (mA)
58- 965
LOAD CURRENT (mA)
0 096 Figure 7. Auto Mode Output Voltage Accuracy Figure 10. Output Voltage Ripple vs. Load Current Rev. B | Page 7 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