MAX8903DETI+ Maxim Integrated Products, MAX8903DETI+ Datasheet - Page 14

• Manufacturer Part Number: MAX8903DETI+
• Description: IC DC/DC CHARGER LI+ 2A 28-TQFN
• Manufacturer: Maxim Integrated Products
• Series: Smart Power Selector™r

Specifications of MAX8903DETI+

• 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2A 1-Cell Li+ DC-DC Chargers for USB
and Adapter Power
The MAX8903_ is a dual input charger with a 16V input
for a wide range of DC sources and USB inputs. The IC
includes a high-voltage (16V) input DC-DC step-down
converter that reduces charger power dissipation while
also supplying power to the system load. The step-
down converter supplies up to 2A to the system, the
battery, or a combination of both.
Figure 2. Typical Application Circuit Using a Separate DC and USB Connector
14
______________________________________________________________________________________
VBUS
GND
ADAPTER
USB
USB SUSPEND
CHARGE ON
500mA
4.7μF
OFF
Circuit Description
100mA
1μH
0.15μF
C
C
0.1μF
L1
DC
BST
C
4.7μF
C
CT
USB
TO DC
17
26
14
27
25
10
28
15
1
2
3
4
6
5
7
USUS
CT
LX
LX
DCM
IUSB
PG
PG
DC
DC
BST
CS
CS
USB
CEN
MAX8903A–
MAX8903E
MAX8903G
MAX8903Y
EP
A USB charge input can charge the battery and power
the system from a USB power source. When powered
from USB or the DC input, system load current peaks
that exceed what can be supplied by the input are sup-
plemented by the battery.
The MAX8903_ also manages load switching from the
battery to and from an external power source with an
on-chip 50mΩ MOSFET. This switch also helps support
load peaks using battery power when the input source
is overloaded.
UOK
DOK
CHG
ISET
THM
GND
SYS
SYS
BAT
BAT
FLT
IDC
VL
13
9
12
18
19
8
22
11
24
23
21
20
16
R
4 x 100kΩ
R
R
PU
ISET
IDC
C
1μF
C
10μF
VL
BAT
C
10μF (MAX8903A/MAX8903C/MAX8903D/MAX8903Y)
22μF (MAX8903B/MAX8903E/MAX8903G)
SYS
TO SYSTEM
LOAD
R
10kΩ
T
1-CELL
LI+
NTC
10kΩ
TO VL
FAULT
OUTPUT
USB PWR OK
DC PWR OK
CHARGE
INDICATOR