MAX8677AETG+T Maxim Integrated Products, MAX8677AETG+T Datasheet - Page 12
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MAX8677AETG+T
Manufacturer Part Number
MAX8677AETG+T
Description
IC USB/AC ADP CHARGER 24-TQFN
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX8677AETG.pdf
(21 pages)
Specifications of MAX8677AETG+T
Function
Charge Management
Battery Type
Lithium-Ion (Li-Ion)
Voltage - Supply
4.1 V ~ 6.6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-TQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
1.5A Dual-Input USB/AC Adapter Charger
and Smart Power Selector
In some instances, there may not be enough adapter
current or USB current to supply peak system loads.
The MAX8677A Smart Power Selector circuitry offers
flexible power distribution from an AC adapter or USB
source to the battery and system load. The battery is
charged with any available power not used by the sys-
tem load. If a system load peak exceeds the input
Figure 3. Typical Application Circuit Using Mini 5-Style Connector or Other DC/USB Common Connector
12
______________________________________________________________________________________
MINI 5-STYLE
CONNECTOR
VBUS
GND
D+
D-
ID
1
2
3
4
5
DC-USB ID
CHARGE
LO = USB
100mA
HI = DC
CHARGE
10kΩ
500mA
ON
4.7μF
DONE
OFF
C
0.068μF
DC
R
R
0.1μF
PSET
560kΩ
ISET
C
C
L
T
NTC
10kΩ
+25°C
10
11
12
1
2
3
4
5
6
7
8
9
DONE
DC
DC
CEN
PEN1
PEN2
PSET
VL
GND
CT
ISET
THM
MAX8677A
current limit, supplemental current is taken from the bat-
tery. Thermal limiting prevents overheating by reducing
power drawn from the input source. In the past, it might
have been necessary to reduce system functionality to
limit current drain when a USB source is connected.
However, in the MAX8677A, this is no longer the case.
When the DC or USB source hits its limit, the battery
supplies supplemental current to maintain the load.
USUS
TSET
UOK
DOK
CHG
USB 16
USB 15
SYS 21
SYS 20
BAT 18
BAT 17
FLT
24
23
22
19
14
13
3X 560kΩ
USB SUSPEND
C
10μF
C
4.7μF
SYS
BAT
560kΩ
TO VL: I
OPEN: I
GND: I
TO VL
FAULT
OUTPUT
USB PWR
OK
DC PWR
OK
TO SYSTEM
LOAD
TO VL
CHARGE
INDICATOR
TERM
1-CELL
Li+
TERM
TERM
= 5%
= 10%
= 15%