Rainbow-electronics MAX1797 Uživatelský manuál stáhnout pdf (Strana 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

(

)

OUT

= +3.3V,

= 100mA

PFET 0.45

Ω

LIM

MAX1795 0.19 0.37

MAX1796 0.35 0.7

LX Switch Current Limit (NFET

only)

MAX1797 0.8 1.32

LX Leakage Current I

LEAK

= 0 and +5.5V, V

OUT

= +5.5V µA

Damping Switch On-Resistance R

DAMP

100 400 Ω

Operating Current into OUT

(Note 2)

= +1.4V 45 µA

Operating Current into BATT V

= +1.4V, V

LBI

= +1V 4 µA

Shutdown Current into BATT SHDN = BATT, V

LBI

= +1V 4 µA

LX Switch Maximum On-Time t

= +1V, if current limit not reached 2.75 5.25 µs

LX Switch Minimum Off-Time t

OFF

= +1V 0.7 1.3 µs

BATT

= +2V 0.8 0.90

LBI Threshold Voltage V

LBI

BATT

= LBI 0.875 0.975

LBI Input Current I

LBI

= +0.8V 100 nA

BATT

= V

LBI

= +0.975V,

sinking 20µA (50Ω typ)

0.1

LBO Low Output Voltage

BATT

= V

LBI

= +1.1V,

sinking 100µA (25Ω typ)

0.1

LBO Off-Leakage Current V

LBO

= +5.5V 100 nA

0.2

BATT

SHDN Input Voltage

0.8

BATT

Shutdown Input Current V

SHDN

= 0 and +5.5V 100 nA

ELECTRICAL CHARACTERISTICS (continued)

BATT

= +2V, OUT = FB (V

OUT

= +3.3V), SHDN = LBI = GND, T

= -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.

1 2 3 4 5 6 7 8 9 ... 12 13

MAX1795/MAX1796/MAX1797 1

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