ADP5501 Analog Devices, ADP5501 Datasheet - Page 7

• Manufacturer Part Number: ADP5501
• Description: Programmable Current Backlight Driver with Ambient Light Sensor Input
• Manufacturer: Analog Devices

Specifications of ADP5501

• 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

TYPICAL PERFORMANCE CHARACTERISTICS
VBAT = 3.6 V, T
90
85
80
75
70
65
60
55
50
45
40
90
85
80
75
70
65
60
55
50
45
40
90
85
80
75
70
65
60
55
50
45
40
Figure 6. Efficiency vs. Backlight Current (Autoload On/Off)
Figure 5. Efficiency vs. Backlight Current (4, 5, and 6 LEDs)
0
0
0
Figure 4. Efficiency vs. Backlight Current (6 LEDs)
2
2
2
4
4
4
A
= 25°C, unless otherwise noted. Inductor = LPS4012-472MLB. Schottky rectifier = MBR140SFT1G.
6
6
6
8
8
8
BACKLIGHT CURRENT (mA)
BACKLIGHT CURRENT (mA)
BACKLIGHT CURRENT (mA)
10 12 14 16 18 20 22 24 26 28
10 12 14 16 18 20 22 24 26 28
10 12 14 16 18 20 22 24 26 28
6 LEDs, VBAT = 4.2V
6 LEDs, VBAT = 4.2V,
AUTOLOAD-ENABLED
6 LEDs, VBAT = 3.6V
5 LEDs, VBAT = 3.6V
4 LEDs, VBAT = 3.6V
6 LEDs, VBAT = 3.0V
6 LEDs, VBAT = 3.6V
6 LEDs, VBAT = 4.2V
6 LEDs, VBAT = 5.5V
30
30
30
Rev. 0 | Page 7 of 28
Figure 8. Typical Auxiliary LED Pin (LED0, LED1, LED2), Full-Scale
48
40
32
24
16
16
14
12
10
8
0
8
6
4
2
0
2.5
0
Figure 7. Standby Supply Current vs. VBAT
3.0
0.5
Sink Current vs. Applied Pin Voltage
TEMP = +25°C
3.5
AUX LED PIN VOLTAGE (V)
1.0
4.0
VBAT (V)
TEMP = +85°C
1.5
TEMP = –40°C
4.5
2.0
5.0
2.5
5.5
ADP5501
6.0
3.0