Owner manual

MAX1678
1-Cell to 2-Cell, Low-Noise,
High-Efficiency, Step-Up DC-DC Converter
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS
(V
BATT
= V
SHDN
= 1.3V, I
LOAD
= 0, FB = GND, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 3)
V
PFI
= 650mV, V
PFO
= 6V
V
PFI
= 0, V
OUT
= 3.3V, I
SINK
= 1mA
V
PFI
= 650mV
Falling PFI hysteresis 2%
V
FB
= 1.3V
V
BATT
= 1V
V
OUT
= 3.5V
V
OUT
= 3.3V
V
OUT
= 3.3V
V
FB
< 0.1V
External feedback
V
OUT
= 3.5V
External feedback
0.9V < V
BATT
< 3.3V (t
ON
= K / V
BATT
)
CONDITIONS
V0.8 x V
BATT
V
IH
SHDN Input High Voltage
V0.2 x V
BATT
V
IL
SHDN Input Low Voltage
µA1PFO Leakage Current
V0.4V
OL
PFO Low Output Voltage
nA10PFI Input Current
mV580 642V
IL,PFI
PFI Trip Voltage
nA10FB Input Current
µA3.5I
SHDN,BATT
Shutdown Current into BATT
µA1I
SHDN,OUT
Shutdown Current into OUT
µA8I
Q,BATT
Quiescent Current into BATT
µA65I
Q,OUT
Quiescent Current into OUT
V-µs5.60 11.2KOn-Time Constant
V5.5V
BATT(MAX)
Maximum Operating Input
Voltage
Ω2.2P-Channel On-Resistance
Ω1.5N-Channel On-Resistance
V3.12 3.48V
OUT
Output Voltage (Fixed Mode)
V2.0 5.5
Output Voltage Range
(Adjustable Mode)
V1.17 1.28V
FB
FB Set Voltage
UNITSMIN MAXSYMBOLPARAMETER
SHDN = GND or BATT
nA10
SHDN Input Current
Note 2: Start-up is guaranteed by correlation to measurements of device parameters (i.e., switch on-resistance, on-time, off-time,
and output voltage trip point).
Note 3: Specifications to -40°C are guaranteed by design and not production tested.