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MAX17710
Energy-Harvesting Charger and Protector
ELECTRICAL CHARACTERISTICS (continued)
(V CHG = +4.3V, Figure 1 , T A = -40 N C to +85 N C, unless otherwise noted. Typical values are at T A = +25 N C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
BOOST REGULATOR
CHG Regulation Voltage
Frequency
Boost Turn-On Time
V BATT = 4.125V
V BATT = 3.9V, V CHG = 3.95V
t BOOST-ON Design guidance, typical only
4.3
0.73
4.5
1
850
4.7
1.27
V
MHz
ns
FB Threshold
FB ON
FB OFF
Rising (enable)
Falling (disable), V CHG = 3.8V
0.485
0.22
0.75
0.25
1.0
0.27
V
FB Input Current Low
V FB = GND, momentary
600
nA
LX nMOS On-Resistan c e
R DS-ON
I LX = 20mA, V BATT = 3.8V, SEL2 = GND
I LX = 10mA, V BATT = 3.8V, SEL2 = open
0.275
4
0.5
8
0.7
12
I
Note 1: Specifications are 100% production tested at T A = +25 N C. Limits over the operating temperature range are guaranteed by
design and characterization.
Note 2: Since the CHG shunt regulator has a 25 F s delay, the user must limit the voltage to the Absolute Maximum Rating until the
internal CHG shunt provides the voltage limit at the pin in response to 50mA input. Larger currents must be shunted with
an external clamp to protect the CHG pin from damage.
Note 3: LCE mode is entered by pulsing AE high, then pulsing AE low.
Note 4: For logic-high, connect LCE to the REG output. Do not connect to the BATT or PCKP pins.
Note 5: Since LCE is compared to the REG pin voltage for operation, the low-power regulator cannot be switched off under condi-
tions where the REG output is shorted to GND.
Maxim Integrated
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