Datasheet

MAX8819A/MAX8819B/MAX8819C
PMIC with Integrated Chargers and Smart
Power Selector in a 4mm x 4mm TQFN
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Detailed Description
The MAX8819_ is a complete power solution that
includes a battery charger, step-down converters, and
WLED power. As shown in Figure 1, the IC integrates a
DC power input, Li+/Li-Poly battery charger, three step-
down converters, and one step-up converter for powering
white LEDs. All three step-down converters feature
adjustable output voltages set with external resistors.
The MAX8819_ has one external power input that con-
nects to either an AC-to-DC adapter or USB port. Logic
inputs DLIM1 and DLIM2 select the desired input cur-
rent limit.
REG1
STEP-DOWN
DC-DC
PV13
LX1
FB1
PG1
EN123
BIAS
REG1/RESET
87% FALLING
50us BLANKING
92% RISING
80ms DELAY
ON
OFF
EP
C8*
10μF
R8
200kΩ
L1
4.7μH
OUT1
3.0V
400mA
R9
100kΩ
C7
4.7μF
SYS
PG1
PG1
PG1
RST1
R10
470kΩ
OUT1
RST1
REG2
STEP-DOWN
DC-DC
PV2
LX2
FB2
PG2
C10*
10μF
R12
80.6kΩ
L2
4.7μH
OUT2
1.8V
200mA
R13
100kΩ
C9
2.2μF
SYS
PG2
PG2
PG2
REG3
STEP-DOWN
DC-DC
LX3
FB3
PG3
*22μF FOR MAX8819C IS RECOMMENDED.
C11*
10μF
R14
20.0kΩ
L3
4.7
μH
OUT3
1.2V
300mA
R15
100kΩ
PG3
PG3
PULSE
DIMMING
GND
REG4
STEP-UP
DC-DC
LX4
OVP4
PG4
PG4
FB4
SYS
C3
0.1μF
50V
X7R
PG4
EN4
D7
L4
10μH
D1
D2
D3
D4
OUT4
ON
OFF
PV13
PV13
EN
EN
EN
PWM
PWM
PWM
UP TO 6
WLED
COMP4
C4
0.022μF
D5
R1
20
(25mA)
PG4
D6
C2
0.1μF
SMART
POWER
SELECTOR
Li+/Li-Poly
BATTERY
CHARGER AND
SYSTEM LOAD
SWITCH
DLIM1
DLIM2
GLITCH FILTER
C1
4.7μF
AC-TO-DC
ADAPTER
SYS
BAT
CISET
C5
10μF
SYS
C6
4.7μF
R2
OUT1
CHG
R6
470kΩ
CHG
ON
OFF
Li+/LiPo
BATTERY
CEN
DLIM1
DLIM2
DC
BATTERY
CAPACITY
(mAh)
DESIRED
CHARGE
RATE (C)
FAST-
CHARGE
CURRENT
(mA)
300
14.3 210
400
0.7
0.7
0.7
0.7
0.7
10.7
280
600
7.15
420
800
5.36
560
900
4.75
632
00
1000
0
1
475
0
195
1
1
SUSPEND
DC I
LIM
(mA)
R7 (kΩ)
+
MAX8819A
MAX8819B
MAX8819C
Figure 1. Functional Diagram/Typical Applications Circuit