MAX8903JETI+ Maxim Integrated, MAX8903JETI+ Datasheet - Page 15

• Manufacturer Part Number: MAX8903JETI+
• Description: Battery Management 2A 1-Cell Li+ DC-DC USB/Adapter Charger
• Manufacturer: Maxim Integrated
• Series: MAX8903A, MAX8903B, MAX8903C, MAX8903D, MAX8903E, MAX8903G, MAX8903H, MAX8903J, MAX8903Yr

Specifications of MAX8903JETI+

• Rohs: yes
• Battery Type: Li-Ion
• Output Voltage: 5 V
• Output Current: 1 mA
• Operating Supply Voltage: 4.1 V to 16 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Charge Safety Timers: Yes
• Maximum Power Dissipation: 1666.7 mW
• Operating Supply Current: 2.3 mA
• Product Type: Charge Management
• Temperature Monitoring: Yes
• Uvlo Start Threshold: 3.2 V

As shown in Figure 1, the IC includes a full-featured
charger with thermistor monitor, fault timer, charger
status, and fault outputs. Also included are power-OK
signals for both USB and DC. Flexibility is maintained
with adjustable charge current, input current limit, and
a minimum system voltage (when charging is scaled
back to hold the system voltage up).
The MAX8903_ prevents overheating during high ambi-
ent temperatures by limiting charging current when the
die temperature exceeds +100°C.
Figure 3. Typical Application Circuit Using a Mini 5 Style Connector or Other DC/USB Common Connector
Maxim Integrated
DC MODE
ADAPTER
VBUS
USB
GND
D-
D+
ID
499kΩ
USB SUSPEND
CHARGE ON
(SEE TABLE 5 FOR
INDUCTOR VALUE
SELECTION)
500mA
4.7µF
OFF
100mA
1µH
0.15µF
C
C
0.1µF
L1
DC
BST
C
CT
2A 1-Cell Li+ DC-DC Chargers
17
27
25
26
14
10
28
15
1
2
3
4
6
7
5
for USB and Adapter Power
USUS
CT
LX
LX
DCM
IUSB
PG
PG
DC
DC
BST
CS
CS
USB
CEN
MAX8903_
MAX8903A–E/G/H/J/N/Y
If a valid DC input is present, the USB power path is
turned off and power for SYS and battery charging is
supplied by the high-frequency step-down regulator
from DC. If the battery voltage is above the minimum
system voltage (V
connects the system voltage to the battery for lowest
power dissipation. The step-down regulation point is
then controlled by three feedback signals: maximum
step-down output current programmed at IDC, maximum
charger current programmed at ISET, and maximum
EP
UOK
DOK
CHG
THM
ISET
GND
SYS
SYS
BAT
BAT
FLT
IDC
VL
13
18
19
11
23
20
9
16
12
8
22
24
21
SYSMIN
R
4 x 100kΩ
R
R
PU
ISET
IDC
C
1µF
DC Input—Fast Hysteretic
VL
C
10µF
, Figure 4), the battery charger
C
(SEE TABLE 6 FOR C
BAT
SYS
R
10kΩ
Step-Down Regulator
T
NTC
10kΩ
TO SYSTEM
LOAD
1-CELL
LI+
TO VL
FAULT
OUTPUT
CHARGE
INDICATOR
USB PWR-OK
DC PWR-OK
SYS
SELECTION)
15