ADP3168 Analog Devices, ADP3168 Datasheet - Page 7

• Manufacturer Part Number: ADP3168
• Description: 4-Phase Synchronous Buck Controller
• Manufacturer: Analog Devices

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4
TYPICAL PERFORMANCE CHARACTERISTICS AND TEST CIRCUITS
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
1.0V
0
39kΩ
1kΩ
12V
SEE EQUATION 1 FOR FREQUENCIES NOT ON THIS GRAPH
200kΩ
Figure 5. Test Circuit 1, Current Sense Amplifier V
1.0V
∆V
Figure 6. Test Circuit, Positioning Voltage
50
Figure 3. Master Clock Frequency vs. RT
10kΩ
∆V FB = FB ∆V = 80mV – FB ∆V = 0mV
12V
100nF
200kΩ
100nF
100
28
18
17
16
19
R
ADP3168
VCC
CSCOMP
CSSUM
CSREF
GND
T
VALUE (kΩ)
150
28
18
17
16
19
8
9
ADP3168
VCC
FB
COMP
CSCOMP
CSSUM
CSREF
GND
V
OS
200
= CSCOMP – 1V
40
250
OS
300
Rev. B | Page 7 of 24
6-BIT CODE
5.3
5.2
5.1
5.0
4.9
4.8
4.7
4.6
Figure 7. Test Circuit 3, Closed-Loop Output Voltage Accuracy
4.7nF
0
Figure 4. Supply Current vs. Master Clock Frequency
1.25V
T
4-PHASE OPERATION
A
0.5
= 25°C
250kΩ
1kΩ
MASTER CLOCK FREQUENCY (MHz)
1.0
10
11
12
13
14
1
2
3
4
5
6
7
8
9
VID4
VID3
VID2
VID1
VID0
VID5
FBRTN
FB
COMP
PWRGD
EN
DELAY
RT
RAMPADJ
1.5
ADP3168
2.0
CSCOMP
CSSUM
CSREF
PWM1
PWM2
PWM3
PWM4
ILIMIT
GND
VCC
SW1
SW2
SW3
SW4
2.5
250kΩ
28
27
26
25
24
23
22
21
20
19
18
17
16
15
3.0
20kΩ
+
1µF
3.5
ADP3168
100nF
100nF
4.0
12V