rt8288a Richtek Technology Corporation, rt8288a Datasheet - Page 6

• Manufacturer Part Number: rt8288a
• Description: 4a, 21v 500khz Synchronous Step-down Converter
• Manufacturer: Richtek Technology Corporation

RT8288A
www.richtek.com
6
Typical Operating Characteristics
0.84
0.83
0.82
0.81
0.80
0.79
0.78
0.77
0.76
100
550
525
500
475
450
425
400
375
350
90
80
70
60
50
40
30
20
10
0
-50
0
4
Switching Frequency vs. Input Voltage
Reference Voltage vs. Temperature
0.5
6
-25
Efficiency vs. Output Current
8
1
0
Output Current (A)
Temperature (°C)
10
Input Voltage (V)
1.5
25
12
V
OUT
2
V
V
OUT
V
= 1.22V, I
14
IN
50
IN
= 21V
2.5
= 1.22V, I
= 12V
16
75
OUT
3
18
OUT
= 0A to 4A
100
3.5
= 0.8A
20
125
22
4
0.830
0.825
0.820
0.815
0.810
0.805
0.800
0.795
0.790
1.240
1.235
1.230
1.225
1.220
1.215
1.210
1.205
1.200
550
525
500
475
450
425
400
375
350
-50
0
4
Switching Frequency vs. Temperature
Reference Voltage vs. Input Voltage
Output Voltage vs. Output Current
0.5
6
-25
8
V
1
IN
0
= 12V, V
10
Output Current (A)
Temperature (°C)
Input Voltage (V)
V
1.5
IN
= 12V, V
25
DS8288A-01 August 2011
12
OUT
2
= 1.22V, I
14
50
OUT
2.5
= 1.22V, I
16
75
OUT
3
18
= 0A to 4A
OUT
100
3.5
20
= 1A
125
22
4