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RT7264AZSP

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
RT7264A
7
DS7264A-01 September 2012 www.richtek.com
©
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Typical Application Circuit
For WDFN-14L 4x3 Package
Table 1. Recommended Components Selection
V
OUT
(V) R1 (kΩ) R2 (kΩ) R
T
(kΩ) L (μH) C
OUT
(μF)
5 75 14.46 0 4.7 22 x 2
3.3 75 24.32 0 3.6 22 x 2
2.5 75 35.82 0 3.6 22 x 2
1.8 5 4.07 30 2 22 x 2
1.5 5 5.84 39 2 22 x 2
1.2 5 10.31 47 2 22 x 2
1.05 5 16.69 47 1.5 22 x 2
For SOP-8 (Exposed Pad) Package
VIN
EN/SYNC
GND
BOOT
FB
SW
5
6
1
2, 3
4
L
100nF
R2
22µF
RT7264A
8, 9 (Exposed Pad)
C
BOOT
R
T
C
IN
C
OUT
R1
VCC
0.1µF
C
C
7
V
IN
V
OUT
Chip Enable
VIN
PGOOD
VCC
BOOT
FB
SW
9
8
1
2, 3, 4, 5
6
L
100nF
R1
R2
V
OUT
22µF
V
IN
RT7264A
11
C
BOOT
C
OUT
C
IN
SS
10
R
T
C
SS
47nF
GND
12, 13, 15 (Exposed Pad)
EN/SYNC
AGND
PGOOD
R3
100k
0.1µF
C
C
7
ON/OFF
14
RT7264A
8
DS7264A-01 September 2012www.richtek.com
©
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Switching Frequency vs. Temperature
300
350
400
450
500
550
600
650
-50 -25 0 25 50 75 100 125
Temperature (°C)
Switching Frequency (kHz) 1
V
IN
= 12V, V
OUT
= 1.22V
Reference Voltage vs. Temperature
0.76
0.77
0.78
0.79
0.80
0.81
0.82
0.83
0.84
-50 -25 0 25 50 75 100 125
Temperature (°C)
Reference Voltage (V)
Reference Voltage vs. Input Voltage
0.785
0.790
0.795
0.800
0.805
0.810
0.815
0.820
0.825
4 6 8 10 12 14 16 18 20 22
Input Voltage (V)
Reference Voltage (V)
Typical Operating Characteristics
Efficiency vs. Output Current
0
10
20
30
40
50
60
70
80
90
100
00.511.522.533.54
Output Current (A)
Efficiency (%)
V
OUT
= 1.22V, I
OUT
= 0A to 4A
V
IN
= 12V
V
IN
= 21V
Output Voltage vs. Output Current
1.18
1.19
1.20
1.21
1.22
1.23
1.24
1.25
1.26
00.511.522.533.54
Output Current (A)
Output Voltage (V)
V
OUT
= 1.22V, I
OUT
= 0A to 4A
V
IN
= 21V
V
IN
= 12V
Switching Frequency vs. Input Voltage
400
425
450
475
500
525
550
4 6 8 10 12 14 16 18 20 22
Input Voltage (V)
Switching Frequency (kHz) 1
V
OUT
= 1.22V
RT7264A
9
DS7264A-01 September 2012 www.richtek.com
©
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Current Limit vs. Input Voltage
0
2
4
6
8
10
12
4 6 8 10 12 14 16 18 20 22
Input Voltage (V)
Current Limit (A)
Current Limit vs. Temperature
0
2
4
6
8
10
12
-50-25 0 25 50 75100125
Temperature (°C)
Current Limit (A)
V
IN
= 12V, V
OUT
= 1.22V
Time (100μs/Div)
Load Transient Response
V
OUT
(500mV/Div)
I
OUT
(2A/Div)
V
IN
= 12V, V
OUT
= 1.22V, I
OUT
= 1A to 4A
Time (100μs/Div)
Load Transient Response
V
OUT
(500mV/Div)
I
OUT
(2A/Div)
V
IN
= 12V, V
OUT
= 1.22V, I
OUT
= 0A to 4A
Time (1μs/Div)
Output Ripple Voltage
V
OUT
(50mV/Div)
V
SW
(10V/Div)
I
L
(2A/Div)
V
IN
= 12V, I
OUT
= 4A
Time (1μs/Div)
Output Ripple Voltage
V
OUT
(50mV/Div)
V
SW
(10V/Div)
I
L
(1A/Div)
V
IN
= 12V, I
OUT
= 1A
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

RT7264AZSP

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IC REG BUCK ADJUSTABLE 4A 8SOP
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