Rainbow Electronics MAX1797 - Manual (Page 4)

MAX1795/MAX1796/MAX1797
Low Supply Current, Step-Up DC-DC Converters
with True-Shutdown
4 _______________________________________________________________________________________
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
NFET 0.3 Internal NFET, PFET On-
Resistance
R DS(ON)
V OUT = +3.3V,
I LX = 100mA PFET 0.45
Ω
I LIM MAX1795 0.19 0.37
MAX1796 0.35 0.7
LX Switch Current Limit (NFET
only)
MAX1797 0.8 1.32
A
LX Leakage Current I LEAK V LX = 0 and +5.5V, V OUT = +5.5V µA
Damping Switch On-Resistance R DAMP 100 400 Ω
Operating Current into OUT
(Note 2)
V FB = +1.4V 45 µA
Operating Current into BATT V FB = +1.4V, V LBI = +1V 4 µA
Shutdown Current into BATT SHDN = BATT, V LBI = +1V 4 µA
LX Switch Maximum On-Time t ON V FB = +1V, if current limit not reached 2.75 5.25 µs
LX Switch Minimum Off-Time t OFF V FB = +1V 0.7 1.3 µs
V BATT = +2V 0.8 0.90
LBI Threshold Voltage V
LBI
V BATT = LBI 0.875 0.975
V
LBI Input Current I LBI V LBI = +0.8V 100 nA
V BATT = V LBI = +0.975V,
sinking 20 µA (50Ω typ)
0.1
LBO Low Output Voltage
V BATT = V LBI = +1.1V,
sinking 100 µA (25Ω typ)
0.1
V
LBO Off-Leakage Current V LBO = +5.5V 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 (continued)
(V BATT = +2V, OUT = FB (V OUT = +3.3V), SHDN = LBI = GND, T A = -40°C to +85°C, unless otherwise noted.) (Note 3)
Note 1: Operating Voltage: Since the regulator is bootstrapped to the output, once started it will operate down to a 0.7V input.
Note 2: Device is bootstrapped (power to IC comes from OUT). This correlates directly with the actual battery supply current.
Note 3: Specifications to -40°C are guaranteed by design, not production tested.