Datasheet

MAX8677C
1.5A Dual-Input USB/AC Adapter Charger
and Smart Power Selector
10 ______________________________________________________________________________________
MAX8677C
DC POWER
MANAGEMENT
CURRENT-
LIMITED
VOLTAGE
REGULATOR
SET
INPUT
LIMIT
THERMISTOR
MONITOR
(SEE FIGURE 7)
CHARGE
TERMINATION
AND MONITOR
CHARGE
TIMER
PWR
OK
USB POWER
MANAGEMENT
CURRENT-
LIMITED
VOLTAGE
REGULATOR
CHARGER
CURRENT-
VOLTAGE
CONTROL
BAT+
BAT-
T
NTC
INPUT AND
CHARGER
CURRENT LIMIT
SET LOGIC
IC
THERMAL
REGULATION
SET
INPUT
LIMIT
EP
PSET
USUS
PEN2
PEN1
USB
USB
UOK
DC MODE
500mA
100mA
USB
LIMIT
USB
SUSPEND
DC
LIMIT
PWR
OK
Li+ BATTERY CHARGER
AND SYS LOAD SWITCH
SYS
ISET
BAT
THM
VL
CHG
PREQ
VL = 15%
TO
SYSTEM
LOAD
N.C. = 10%
5%
TSET
FLT
CT
CEN
GND
DOK
DC
AC
ADAPTER
Figure 1. Block Diagram
Circuit Description
The MAX8677C contains an Li+ battery charger, as
well as power MOSFETs and control circuitry to man-
age power flow in portable devices. See Figure 1. The
charger has two power inputs, DC and USB. These can
be separately connected to an AC adapter output and
a USB port, or the DC input can be a single power
input that connects to either an adapter or USB. Logic
inputs, PEN1 and PEN2, select the correct current limits