Datasheet

ADP5520
Rev. A | Page 7 of 40
TYPICAL PERFORMANCE CHARACTERISTICS
VBAT = 3.6 V, T
A
= 25°C, unless otherwise noted. Inductor = LPS4012-472MLB. Schottky rectifier = MBR140SFT1G.
90
85
80
75
70
65
60
55
50
45
40
024681012141618202224262830
BACKLIGHT CURRENT (mA)
EFFICIENCY (%)
07445-047
6 LEDs, VBAT = 3.0V
6 LEDs, VBAT = 3.6V
6 LEDs, VBAT = 4.2V
6 LEDs, VBAT = 5.5V
Figure 4. Efficiency vs. Backlight Current (6 LEDS)
90
85
80
75
70
65
60
55
50
45
40
024681012141618202224262830
BACKLIGHT CURRENT (mA)
EFFICIENCY (%)
07445-048
6 LEDs, VBAT = 3.6V
5 LEDs, VBAT = 3.6V
4 LEDs, VBAT = 3.6V
Figure 5. Efficiency vs. Backlight Current (4, 5, and 6 LEDS)
90
85
80
75
70
65
60
55
50
45
40
024681012141618202224262830
BACKLIGHT CURRENT (mA)
EFFICIENCY (%)
07445-049
6 LEDs, VBAT = 4.2V
6 LEDs, VBAT = 4.2V,
AUTOLOAD-ENABLED
Figure 6. Efficiency vs. Backlight Current (Autoload On/Off)
48
40
32
24
16
8
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
VBAT (V)
STANDBY SUPPLY CURRENT (µA)
07445-050
TEMP = –40°C
TEMP = +25°C
TEMP = +85°C
Figure 7. Standby Supply Current vs. VBAT
16
14
12
10
8
6
4
2
0
0 0.5 1.0 1.5 2.0 2.5 3.0
AUX LED PIN VOLTAGE (V)
AUX LED FULL-SCALE SINK CURRENT (mA)
07445-051
Figure 8. Typical Auxiliary LED Pin (R3, C3, or ILED), Full-Scale Sink Current vs.
Applied Pin Voltage