MAX1642/MAX1643
High-Efficiency, Step-Up
DC-DC Converters for 1V Inputs
_______________________________________________________________________________________ 3
Note 2: Start-up guaranteed by correlation to measurements of device parameters (i.e., switch on-resistance, on-times, off-times, and
output voltage trip points).
Note 3: . This guarantees discontinuous conduction.
Note 4: Specifications to -40°C are guaranteed by design, not production tested.
Falling PFI, hysteresis = 1%
V
BATT
= 1.0V (MAX1642)
0.9V < V
BATT
< 1.5V (t
ON
= K / V
BATT
)
V
OUT
= 3.5V (MAX1642)
V
OUT
= 3.3V
V
FB
< 0.1V
External feedback
V
OUT
= 3.5V
V
OUT
= 3.3V
CONDITIONS
mV 550 662PFI Trip Voltage
µA3.5I
SHDN,BATT
Shutdown Current into BATT
µA1I
SHDN,OUT
Shutdown Current into OUT
µA6.5I
QBATT
Quiescent Current into BATT
µA18I
QOUT
Quiescent Current into OUT
V-µs12.4 38.2KOn-Time Constant
Ω2.2P-Channel On-Resistance
V2.99 3.56V
OUT
Output Voltage
V1.11 1.32V
FB
FB Set Voltage
Ω1.5N-Channel On-Resistance
UNITSMIN MAXSYMBOLPARAMETER
ELECTRICAL CHARACTERISTICS
(V
BATT
= V
SHDN
= 1.3V, I
LOAD
= 0mA, FB = GND, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 4)
Falling V
BATT
, V
OUT
= 3.3V, hysteresis = 2%
(MAX1643)
V0.93 1.06
BATTLO Trip Voltage
__________________________________________Typical Operating Characteristics
(Circuit of Figure 4, V
BATT
= 1.2V, R1 + R2 = 1MΩ, T
A
= +25°C, unless otherwise noted.)
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