Datasheet

MAX8677C
1.5A Dual-Input USB/AC Adapter Charger
and Smart Power Selector
_______________________________________________________________________________________ 3
PARAMETER CONDITIONS MIN TYP MAX UNITS
USB-TO-SYS PREREGULATOR
USB Operating Range 4.1 6.6 V
USB Standoff Voltage V
BAT
= V
SYS
= 0V 8 V
USB Undervoltage Threshold When V
UOK
goes low, V
USB
rising, 500mV hysteresis 3.95 4.0 4.05 V
USB Overvoltage Threshold When V
UOK
goes high, V
USB
rising, 100mV hysteresis 6.8 6.9 7.0 V
I
SYS
= I
BAT
= 0mA, V
CEN
= 0V, V
PEN2
= 0V 1 2
USB Supply Current
I
SYS
= I
BAT
= 0mA, V
CEN
= 5V, V
PEN2
= 0V 0.9 1.5
mA
USB Shutdown Current DC = unconnected, V
USB
= V
CEN
= V
USUS
= 5V 190 333 µA
USB-to-SYS On-Resistance DC = unconnected, V
USB
= V
CEN
= 5V, I
SYS
= 400mA 0.2 0.31 Ω
USB-to-BAT Drop-Out Voltage
When SYS regulation and charging stops, V
USB
falling,
250mV hysteresis
10 50 90 mV
V
PEN1
= 0V,
V
PEN2
= 5V
450 475 500
USB Current Limit
(See Table 2 for Input Source
Control)
DC = unconnected,
V
USB
= 5V,
T
A
= +25°C
V
PEN1
= 0V,
V
PEN2
= 0V
80 95 100
mA
SYS Regulation Voltage
DC = unconnected, V
USB
= 6V;
I
SYS
= 1mA to 400mA, V
CEN
= 5V
4.29 4.35 4.40 V
Input Limiter Soft-Start Time Input current ramp time 50 µs
Thermal-Limit Start Temperature +100 °C
Thermal-Limit Gain I
SYS
reduction/die temperature (above +100°C) 5 %/°C
VL Voltage DC = unconnected, V
USB
= 5V; I
VL
= 0 to 10mA 3.0 3.3 3.6 V
CHARGER
BAT-to-SYS On-Resistance V
DC
= 0V, V
BAT
= 4.2V, I
SYS
= 1A 0.04 0.08 Ω
BAT-to-SYS Reverse Regulation
Voltage
V
PEN1
= V
PEN2
= 0V, I
SYS
= 200mA 40 68 90 mV
T
A
= +25°C 4.179 4.2 4.221
BAT Regulation Voltage I
BAT
= 0mA
T
A
= 0°C to +85°C 4.158 4.2 4.242
V
BAT Recharge Threshold Change in V
BAT
from DONE to fast-charge -135 -95 -45 mV
BAT Charge-Current Set Range R
ISET
= 10kΩ to 2kΩ (Note 2) 0.3 1.5 A
R
ISET
= 2.4kΩ 1125 1250 1375
R
ISET
= 4kΩ 675 750 825
R
ISET
= 10kΩ 270 300 330
R
ISET
= 4kΩ, V
BAT
= 2.5V
(prequal mode)
50 75.0 100
R
ISET
= 6.2kΩ, V
BAT
= 2.5V
(prequal mode)
23 48 73
BAT Charge-Current Accuracy,
Charger Loop in Control
V
SYS
= 5.5V,
T
A
= 0°C to +85°C
R
ISET
= 10kΩ, V
BAT
= 2.5V
(prequal mode)
30
mA
ELECTRICAL CHARACTERISTICS (continued)
(V
DC
= 5V, THM = CEN = USUS = GND, V
BAT
= 4V, V
PEN1
= V
PEN2
= 5V, USB, TSET, PREQ, CHG, DOK, UOK, FLT are unconnected,
T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)