Datasheet

MAX1795/MAX1796/MAX1797
Low Supply Current, Step-Up DC-DC Converters
with True-Shutdown
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= +2V, OUT = FB (V
OUT
= +3.3V), SHDN = LBI = GND, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are
T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Current into BATT V
FB
= +1.4V, V
LBI
= +1V 2 4 µA
Shutdown Current into BATT SHDN = BATT, V
LBI
= +1V 2 4 µA
LX Switch MaxImum On-Time t
ON
V
FB
= +1V, if current limit not reached 3 4 5 µs
LX Switch Minimum Off-Time t
OFF
V
FB
= +1V 0.8 1 1.2 µs
V
BATT
= +2V 0.8 0.85 0.90
LBI Threshold Voltage Falling V
LBI
V
BATT
= LBI 0.875 0.925 0.975
V
LBI Hysteresis 25 mV
LBI Input Current I
LBI
V
LBI
= +0.8V 9 100 nA
V
BATT
= V
LBI
= +0.975V,
sinking 20µA (50Ω typ)
0.1
LBO Low Output Voltage
V
BATT
= V
LBI
= +1.1V,
sinking 100µA (25Ω typ)
0.1
V
LBO Off-Leakage Current V
LBO
= +5.5V 1 100 nA
V
IL
0.2
✕
V
BATT
SHDN Input Voltage
V
IH
0.8
✕
V
BATT
V
Shutdown Input Current V
SHDN
= 0 and +5.5V 100 nA
ELECTRICAL CHARACTERISTICS
(V
BATT
= +2V, OUT = FB (V
OUT
= +3.3V), SHDN = LBI = GND, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
Operating Voltage V
BATT
Note 1 1.0 5.5 V
FB = OUT 3.13 3.47
Output Voltage V
OUT
FB = GND 4.75 5.25
V
Adjustable Output Voltage
Range
2.0 5.5 V
MAX1795 100
MAX1796 200
FB = OUT
(V
OUT
= +3.3V)
MAX1797 400
MAX1795 60
MAX1796 125
Steady-State Output Current
(Note 1)
I
OUT
FB = GND
(V
OUT
= +5.0V)
MAX1797 250
mA
Feedback Set-Point Voltage
(Adjustable Mode)
V
FB
V
OUT
= +2V to +5.5V 1.19 1.29 V
Feedback Input Current I
FB
V
FB
= +1.25V 100 nA