Datasheet

ADP2105/ADP2106/ADP2107 Data Sheet
Rev. D | Page 20 of 36
BODE PLOTS
60
–40
1 300
FREQUENCY (kHz)
LOOP GAIN (dB)
10 100
50
40
30
20
10
0
–10
–20
–30
LOOP PHASE (Degrees)
0
45
90
135
180
06079-055
LOOP GAIN
LOOP PHASE
PHASE
MARGIN = 48°
CROSSOVER
FREQUENCY = 87kHz
ADP2106
OUTPUT VOLTAGE = 1.8V
INPUT VOLTAGE = 5.5V
LOAD CURRENT = 1A
INDUCTOR = 2.2µH (LPS4012)
OUTPUT CAPACITOR = 22µF + 22µF
COMPENSATION RESISTOR = 180kΩ
COMPENSATION CAPACITOR = 56pF
NOTES
1. EXTERNAL COMPONENTS WERE CHOSEN FOR A
5% OVERSHOOT FOR A 1A LOAD TRANSIENT.
Figure 41. ADP2106 Bode Plot at V
IN
= 5.5 V, V
OUT
= 1.8 V and Load = 1 A
60
–40
1 300
FREQUENCY (kHz)
LOOP GAIN (dB)
10 100
50
40
30
20
10
0
–10
–20
–30
LOOP PHASE (Degrees)
0
45
90
135
180
06079-056
NOTES
1. EXTERNAL COMPONENTS WERE CHOSEN FOR A
5% OVERSHOOT FOR A 1A LOAD TRANSIENT.
ADP2106
PHASE
MARGIN = 52°
LOOP GAIN
LOOP PHASE
OUTPUT VOLTAGE = 1.8V
INPUT VOLTAGE = 3.6V
LOAD CURRENT = 1A
INDUCTOR = 2.2µH (LPS4012)
OUTPUT CAPACITOR = 22µF + 22µF
COMPENSATION RESISTOR = 180kΩ
COMPENSATION CAPACITOR = 56pF
CROSSOVER
FREQUENCY = 83kHz
Figure 42. ADP2106 Bode Plot at V
IN
= 3.6 V, V
OUT
= 1.8 V, and Load = 1 A
60
–40
1 300
FREQUENCY (kHz)
LOOP GAIN (dB)
10 100
50
40
30
20
10
0
–10
–20
–30
LOOP PHASE (Degrees)
0
45
90
135
180
06079-057
ADP2105
NOTES
1. EXTERNAL COMPONENTS WERE CHOSEN FOR A
5% OVERSHOOT FOR A 1A LOAD TRANSIENT.
LOOP GAIN
LOOP PHASE
PHASE
MARGIN = 51°
CROSSOVER
FREQUENCY = 71kHz
OUTPUT VOLTAGE = 1.2V
INPUT VOLTAGE = 3.6V
LOAD CURRENT = 1A
INDUCTOR = 3.3µH (SD3814)
OUTPUT CAPACITOR = 22µF + 22µF + 4.7µF
COMPENSATION RESISTOR = 267kΩ
COMPENSATION CAPACITOR = 39pF
Figure 43. ADP2105 Bode Plot at V
IN
= 3.6 V, V
OUT
= 1.2 V, and Load = 1 A
60
–40
1 300
FREQUENCY (kHz)
LOOP GAIN (dB)
10 100
50
40
30
20
10
0
–10
–20
–30
LOOP PHASE (Degrees)
0
45
90
135
180
06079-058
ADP2105
NOTES
1. EXTERNAL COMPONENTS WERE CHOSEN FOR A
5% OVERSHOOT FOR A 1A LOAD TRANSIENT.
CROSSOVER
FREQUENCY = 79kHz
PHASE
MARGIN = 49°
LOOP GAIN
LOOP PHASE
OUTPUT VOLTAGE = 1.2V
INPUT VOLTAGE = 5.5V
LOAD CURRENT = 1A
INDUCTOR = 3.3µH (SD3814)
OUTPUT CAPACITOR = 22µF + 22µF + 4.7µF
COMPENSATION RESISTOR = 267kΩ
COMPENSATION CAPACITOR = 39pF
Figure 44. ADP2105 Bode Plot at V
IN
= 5.5 V, V
OUT
= 1.2 V and Load = 1 A
60
–40
1 300
FREQUENCY (kHz)
LOOP GAIN (dB)
10 100
50
40
30
20
10
0
–10
–20
–30
LOOP PHASE (Degrees)
0
45
90
135
180
06079-059
ADP2107
NOTES
1. EXTERNAL COMPONENTS WERE CHOSEN FOR A
10% OVERSHOOT FOR A 1A LOAD TRANSIENT.
PHASE
MARGIN = 65°
CROSSOVER
FREQUENCY = 76kHz
OUTPUT VOLTAGE = 2.5V
INPUT VOLTAGE = 5V
LOAD CURRENT = 1A
INDUCTOR = 2µH (D62LCB)
OUTPUT CAPACITOR = 10µF + 4.7µF
COMPENSATION RESISTOR = 70kΩ
COMPENSATION CAPACITOR = 120pF
LOOP PHASE
LOOP GAIN
Figure 45. ADP2107 Bode Plot at V
IN
= 5 V, V
OUT
= 2.5 V and Load = 1 A
60
–40
1 300
FREQUENCY (kHz)
LOOP GAIN (dB)
10 100
50
40
30
20
10
0
–10
–20
–30
LOOP PHASE (Degrees)
0
45
90
135
180
06079-069
ADP2107
NOTES
1. EXTERNAL COMPONENTS WERE CHOSEN FOR A
10% OVERSHOOT FOR A 1A LOAD TRANSIENT.
LOOP GAIN
LOOP PHASE
PHASE
MARGIN = 70°
OUTPUT VOLTAGE = 3.3V
INPUT VOLTAGE = 5V
LOAD CURRENT = 1A
INDUCTOR = 2.5µH (CDRH5D28)
OUTPUT CAPACITOR = 10µF + 4.7µF
COMPENSATION RESISTOR = 70kΩ
COMPENSATION CAPACITOR = 120pF
CROSSOVER
FREQUENCY = 67kHz
Figure 46. ADP2107 Bode Plot at V
IN
= 5 V, V
OUT
= 3.3 V, and Load = 1 A