Datasheet

MAX8819A/MAX8819B/MAX8819C
PMIC with Integrated Chargers and Smart
Power Selector in a 4mm x 4mm TQFN
12 ______________________________________________________________________________________
Typical Operating Characteristics (continued)
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
LED EFFICIENCY vs. SYS VOLTAGE
SYS VOLTAGE (V)
LED EFFICIENCY (%)
MAX8819A toc28
2.5 3.0 3.5 4.0 4.5 5.0 5.5
50
55
60
65
70
75
80
85
90
95
100
6 LEDS
4 LEDS
I
LED
= 25mA
INDUCTOR: TOKO 1096AS-100M
DIODE: NXP PMEG3005EB
LED EFFICIENCY
vs. LED CURRENT (6 LEDS)
LED CURRENT (mA)
LED EFFICIENCY (%)
MAX8819A toc29
0 5 10 15 20 25
0
10
20
30
40
50
60
70
80
90
100
V
SYS
= 3.6V
LED EFFICIENCY
vs. LED CURRENT (4 LEDS)
LED CURRENT (mA)
LED EFFICIENCY (%)
MAX8819A toc30
0 5 10 15 20 25
0
10
20
30
40
50
60
70
80
90
100
V
SYS
= 3.6V
LED AND BOOST EFFICIENCY
vs. SYS VOLTAGE
SYS VOLTAGE (V)
EFFICIENCY (%)
MAX8819A toc31
2.5 3.0 3.5 4.0 4.5 5.0 5.5
50
55
60
65
70
75
80
85
90
95
100
I
LED
= 25mA
6 LEDS
INDUCTOR: TOKO 1096AS-100M
DIODE: NXP PMEG3005EB
BOOST
LED
REG4 INPUT CURRENT
vs. SYS VOLTAGE
SYS VOLTAGE (V)
REG4 INPUT CURRENT (mA)
MAX8819A toc32
2.5 3.0 3.5 4.0 4.5 5.0 5.5
0
50
100
150
200
250
300
6 LEDS, I
LED
= 25mA
REG4 STARTUP AND SHUTDOWN
RESPONSE
MAX8819A toc33
2ms/div
2V/div
10V/div
0V
0mA
10mA/div
V
EN4
V
OVP4
I
LED
FB4 VOLTAGE vs. LED CURRENT
LED CURRENT (mA)
FB4 VOLTAGE (mV)
MAX8819A toc34
0 5 10 15 20 25
0
50
100
150
200
250
300
350
400
450
500