ADP5520 Analog Devices, ADP5520 Datasheet - Page 36

• Manufacturer Part Number: ADP5520
• Description: Backlight Driver with I/O Expander
• Manufacturer: Analog Devices

Specifications of ADP5520

• Vin Range: 2.7 to 5.5V
• Vout (v): 24 to 27
• Synchronous: No
• Package: 24-Lead LFCSP
• Led Configuration: Serial
• Topology: Inductive
• I2c Support: Yes
• Max Iout (ma): 30mA
• Brightness Control: I2C
• Switching Frequency: 1MHz
• Over Volt Protection (v): 24V

ADP5520
EXAMPLE CIRCUITS
I/O RAIL
I/O RAIL
VBAT
VBAT
1µF
1µF
21
16
15
21
16
15
1
5
4
3
1
5
4
3
Figure 53. I/O Configuration Example 1
Figure 54. I/O Configuration Example 2
PGND
VBAT
VDDIO
SCL
SDA
nINT
nRST
PGND
VBAT
VDDIO
SCL
SDA
nINT
nRST
4.7µH
4.7µH
R2
6
R3
13
SW
SW
R1
R2
7
2
2
6
1µF
1µF
R0
R1
8
7
BST
BST
C0
22
R0
22
9
A
E
I
8
ADP5520
ADP5520
C1
10
C0
B
F
J
9
A
E
M
I
C2
11
C
G
K
C1
10
B
F
J
N
C2
11
C
G
K
O
R3
13
C3
12
D
H
L
P
BL_SNK
BL_SNK
C3
CAP_OUT
CAP_OUT
12
CMP_IN
CMP_IN
23
23
VBAT
VBAT
ILED
ILED
GND
GND
GND
GND
GND
GND
14
14
20
19
18
24
17
20
19
18
24
17
1µF
100nF
1µF
100nF
VBAT
VBAT
Rev. A | Page 36 of 40
I/O RAIL
I/O RAIL
VBAT
VBAT
1µF
1µF
21
16
15
21
16
15
1
5
4
3
1
5
4
3
Figure 55. I/O Configuration Example 3
Figure 56. I/O Configuration Example 4
PGND
VBAT
VDDIO
SCL
SDA
nINT
nRST
PGND
VBAT
VDDIO
SCL
SDA
nINT
nRST
4.7µH
4.7µH
R2
6
R3
13
SW
R1
SW
7
R2
2
2
6
1µF
1µF
R0
R1
8
7
BST
BST
C0
R0
22
9
A
E
22
I
8
ADP5520
ADP5520
C1
10
B
F
J
C0
9
A
E
C2
11
C
G
K
C1
10
B
F
C2
11
C
G
R3
13
C3
12
D
H
C3
12
BL_SNK
BL_SNK
CAP_OUT
CAP_OUT
CMP_IN
CMP_IN
23
23
VBAT
ILED
VBAT
ILED
GND
GND
GND
GND
GND
GND
14
14
20
19
18
24
17
20
19
18
24
17
1µF
100nF
1µF
100nF
VBAT
VBAT