ADP2503 Analog Devices, ADP2503 Datasheet - Page 9

• Manufacturer Part Number: ADP2503
• Description: 600 mA, 2.5 MHz Buck-Boost DC-to-DC Converter
• Manufacturer: Analog Devices

Figure 23. Typical PWM Switching Waveform, Boost Operation (V
Figure 22. Typical PWM Switching Waveform, Buck Operation (V
Figure 21. Mode Change by Load Transients, Load Fall (V
4
2
1
3
4
2
1
3
4
2
1
CH1
CH1
CH3
CH1
CH3
V
V
100mV
50.0mV
5.00V
20.0mV
5.00V
IN
OUT
= 3.6V
= 3.3V
B
B
B
W
W
B
B
W
W
W
CH2 500mA Ω
CH2 250mA Ω
CH2 250mA Ω
CH4
CH4
CH4
SW1
I
V
SW2
SW1
V
SW2
SW1
V
OUT
2.00V
5.00V
5.00V
I
I
OUT
OUT
OUT
SW
SW
B
B
B
W
W
W
M100µs
M 400ns
M 400ns
T
T
T
45.40%
50.00%
50.80%
V
V
V
V
IN
OUT
IN
OUT
= 4.0V
= 3.0V
A CH2
A CH3
A CH4
= 3.3V
= 3.3V
OUT
410mA
2.40V
2.40V
= 3.3 V)
OUT
OUT
= 3.3 V)
= 3.3 V)
Rev. B | Page 9 of 16
Figure 24. Typical PWM Switching Waveform, Buck-Boost Operation
Figure 25. Typical PSM Switching Waveform, Buck-Boost Operation
3
4
2
1
3
4
2
1
4
1
2
3
Figure 26. Startup into PWM Mode (V
CH1
CH3
CH1
CH3
CH1
CH3
20.0mV
5.00V
100mV
5.00V
2.00V
5.00V
SW1
I
EN
V
SW
OUT
B
B
B
B
W
W
W
B
W
B
W
W
CH2 500mAΩ
CH4 5.00V
CH2 250mA Ω
CH2 1.00A Ω
CH4
CH4
SW2
SW1
V
SW2
SW1
V
5.00V
5.00V
I
OUT
I
OUT
SW
SW
(V
(V
OUT
OUT
B
B
W
B
= 3.3 V)
W
= 3.3 V)
B
W
W
ADP2503/ADP2504
M 400ns
M 4.00µs
M 100µs
T
T
T
OUT
50.00%
15.20%
9.400%
V
V
V
V
= 3.3 V, I
IN
OUT
IN
OUT
= 3.0V
= 3.0V
V
A CH2
OUT
A CH3
= 3.3V
A CH4
= 3.3V
OUT
= 3.3V
= 300 mA)
2.40V
820mA
2.40V