MAX8819A MAXIM [Maxim Integrated Products], MAX8819A Datasheet - Page 13

• Manufacturer Part Number: MAX8819A
• Description: PMIC with Integrated Chargers and Smart Power Selector in a 4mm x 4mm TQFN
• Manufacturer: MAXIM [Maxim Integrated Products]

(Circuit of Figure 1, T
PIN
10
11
12
13
1
2
3
4
5
6
7
8
9
25.5
25.4
25.3
25.2
25.1
25.0
24.9
24.8
24.7
24.6
24.5
PMIC with Integrated Chargers and Smart
COMP4
NAME
OVP4
-40
RST1
GND
CEN
PG4
EN4
BAT
FB4
LX4
SYS
FB1
______________________________________________________________________________________
DC
A
= +25°C, unless otherwise noted.)
Power Selector in a 4mm x 4mm TQFN
-15
MAXIMUM LED CURRENT
vs. TEMPERATURE
TEMPERATURE (°C)
External Compensation Capacitor for REG4
REG4 Feedback Input
Overvoltage Protection Node for REG4
REG4 Power Ground
Inductor Switching Node for REG4
Analog Ground
REG4 Enable Input and Dimming Control Digital Input
Active-Low, Open-Drain Reset Output. RST1 pulls low to indicate that FB1 is below its regulation
threshold. RST1 goes high 200ms after FB1 reaches its regulation threshold. RST1 is high-impedance
when EN123 is low, and DC is unconnected.
Positive Battery Terminal Connection. Connect BAT to the positive terminal of a single-cell Li+/Li-Poly
battery. Bypass BAT to GND with a 4.7µF ceramic capacitor.
System Supply Output. Bypass SYS to GND with a 10µF ceramic capacitor. When a valid voltage is
present at DC and DLIM[1:2] ≠ 11, V
(MAX8819B). When the system load (I
(V
connected to BAT through an internal 70mΩ system load switch when a valid source is not present at
DC.
DC Power Input. DC is capable of delivering 1A to SYS. DC supports both AC adapters and USB
inputs. As shown in Table 1, the DC current limit is controlled by DLIM1 and DLIM2.
Battery Charger Enable Input
Feedback Input for REG1. Connect FB1 to the center of a resistor voltage-divider from the REG1
output capacitors to GND to set the output voltage from 1V to V
BSREG
10
) below V
35
60
BAT
Typical Operating Characteristics (continued)
, allowing both the external power source and the battery to service SYS. SYS is
85
SYS
SYS
is limited to 4.35V (MAX8819A/MAX8819C) or 5.3V
) exceeds the input current limit, V
FUNCTION
0.750
0.745
0.740
0.735
0.730
-40
-15
MINIMUM LED CURRENT
vs. TEMPERATURE
TEMPERATURE (°C)
SYS
10
.
35
Pin Description
SYS
60
drops 75mV
85
13