MAX8903AETI+ Maxim Integrated Products, MAX8903AETI+ Datasheet - Page 15

• Manufacturer Part Number: MAX8903AETI+
• Description: IC DC/DC CHARGER LI+ 28-TQFN
• Manufacturer: Maxim Integrated Products
• Series: Smart Power Selector™r

Specifications of MAX8903AETI+

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 4.1 V ~ 16 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Product: Charge Management
• Output Voltage: 4.2 V
• Output Current: 0.5 to 2 A
• Operating Supply Voltage: 4.15 V to 16 V
• Supply Current: 0.1 mA to 15 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Charge Safety Timers: Yes
• Mounting Style: SMD/SMT
• Temperature Monitoring: Yes
• Uvlo Start Threshold: 3.2 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
DC MODE
ADAPTER
VBUS
USB
GND
D-
D+
ID
______________________________________________________________________________________
499kΩ
USB SUSPEND
2A 1-Cell Li+ DC-DC Chargers for USB
CHARGE ON
500mA
4.7μF
OFF
100mA
1μH
0.15μF
C
C
0.1μF
L1
DC
BST
C
CT
17
27
26
14
10
28
25
15
1
2
3
4
6
7
5
LX
IUSB
USUS
CT
PG
PG
DC
DC
BST
LX
CS
CS
USB
DCM
CEN
MAX8903A–
MAX8903G
MAX8903Y
MAX8903E
EP
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
DOK
CHG
THM
UOK
ISET
GND
SYS
SYS
BAT
BAT
FLT
IDC
VL
and Adapter Power
13
18
19
8
11
24
23
20
9
16
12
22
21
R
4 x 100kΩ
R
R
PU
ISET
IDC
C
1μF
VL
SYSMIN
C
10μF
C
10μF (MAX8903A/MAX8903C/MAX8903D/MAX8903Y)
22μF (MAX8903B/MAX8903E)
BAT
SYS
R
10kΩ
DC Input—Fast Hysteretic
T
NTC
10kΩ
, Figure 4), the battery charger
TO SYSTEM
LOAD
1-CELL
LI+
TO VL
Step-Down Regulator
FAULT
OUTPUT
USB PWR-OK
CHARGE
INDICATOR
DC PWR-OK
15