ADP2107 Analog Devices, ADP2107 Datasheet - Page 20

• Manufacturer Part Number: ADP2107
• Description: 2 Amp Synchronous, Step-Down DC-to-DC Converter
• Manufacturer: Analog Devices

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