Datasheet

MAX8819A/MAX8819B/MAX8819C
PMIC with Integrated Chargers and Smart
Power Selector in a 4mm x 4mm TQFN
_______________________________________________________________________________________ 9
SYSTEM VOLTAGE
vs. SYSTEM CURRENT
OUTPUT CURRENT (mA)
SYSTEM VOLTAGE (V)
MAX8819A toc09
0 100 200 300 400 500 600 700 800 900 1000
3.8
3.9
4.0
4.1
4.2
4.3
4.4
4.5
V
DC
= 5.1V
V
BATT
= 4V
DLIM[1:2] = 01
AC-TO-DC ADAPTER CONNECT
MAX8819A toc10
400μs/div
V
DC
5V/div
2V/div
1A/div
1A/div
3.84V
4.3V
4V
1A
-1A
V
SYS
I
DC
I
BAT
C
DC
CHARGING
NEGATIVE BATTERY
CURRENT FLOWS
INTO THE
BATTERY
BATTERY CHARGER
SOFT-START
C
SYS
CHARGING
POWER-UP SEQUENCING
(MAX8819A/MAX8819B)
MAX8819A toc11
2ms/div
V
EN123
2V/div
0V
0V
0V
0V
2V/div
2V/div
2V/div
V
V1
V
V2
V
V3
POWER-UP SEQUENCING
(MAX8819C)
MAX8819A toc12
1ms/div
2V/div
0V
0V
0V
2V/div
2V/div
V
V1
V
V2
V
V3
POWER-DOWN SEQUENCING
(MAX8819C)
MAX8819A toc13
100μs/div
2V/div
0V
0V
0V
0V
2V/div
2V/div
2V/div
V
V1
V
RST1
V
V2
V
V3
I
V3
= 200mA
I
V2
= 180mA
I
V1
= 220mA
REG1 EFFICIENCY
vs. LOAD CURRENT (V
REG1
= 3.01V)
LOAD CURRENT (mA)
REG1 EFFICIENCY (%)
MAX8819A toc14
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100 1000
Typical Operating Characteristics (continued)
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)