RT7241A
Typical Operating Characteristics
Performance waveforms are tested on the evaluation board of the Typical Application Circuit, V
IN
= 12V, V
OUT
= 1.35V, L = 0.56μH, T
J
= 25°C,
unless otherwise noted.
Efficiency vs. Load Current
100
95
90
100
95
90
Efficiency vs. Load Current
Efficiency (%)
80
75
70
65
60
55
50
0.001
0.010
Efficiency (%)
85
85
80
75
70
65
60
V
IN
= 7.4V
V
IN
= 12V
V
IN
= 19V
V
IN
= 7.4V
V
IN
= 12V
V
IN
= 20V
V
DDQ
= 1.35V, V
DD
= 5V, f
SW
= 500kHz,
L = 0.56μH, DCR = 1.8mΩ
0.100
1.000
10.000
100.000
55
50
0.001
0.010
V
DDQ
= 1.2V, V
DD
= 5V, f
SW
= 500kHz,
L = 0.56μH, DCR = 1.8mΩ
0.100
1.000
10.000
100.000
Load Current (A)
Load Current (A)
Switching Frequency vs. Load Current
550
Quiescent Current vs. VDD Input Voltage
125
123
120
118
115
113
110
4.5
4.6
Switching Frequency (kHz)
1
540
520
510
500
490
480
470
460
450
2
3
4
5
V
IN
= 7.4V
V
IN
= 12V
V
IN
= 19V
V
DDQ
= 1.35V, V
DD
= 5V, S5 = 5V
6
7
8
9
10
11
12
Quiescent Current (μA)
530
V
IN
= 12V, S5 = 5V, S3 = GND, No Switching
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
Load Current (A)
VDD Input Voltage (V)
Shutdown Current vs. VDD Input Voltage
10
9
0.705
0.695
VTT Output Voltage vs. Load Current
Shutdown Current (μA)1
8
7
6
5
4
3
2
1
0
4.5
4.6
4.7
4.8
4.9
Output Voltage (V)
V
IN
= 12V, S5 = 5V, S3 = GND
5.0
5.1
5.2
5.3
5.4
5.5
0.685
0.675
0.665
0.655
0.645
-1.5
-1
V
IN
= 12V, V
DDQ
= 1.35V, V
DD
= 5V
-0.5
0
0.5
1
1.5
VDD Input Voltage (V)
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
Load Current (A)
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
8
DS7241A-02 January 2017
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
