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

PFET

0.45

Ω

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

µA

Damping Switch On-Resistance

100

400

Ω

Operating Current into OUT

(Note 2)

45

µA

Operating Current into BATT

4

µA

Shutdown Current into BATT

4

µA

LX Switch Maximum On-Time

2.75

5.25

µs

LX Switch Minimum Off-Time

0.7

1.3

µs

0.8

0.90

LBI Threshold Voltage

0.875

0.975

V

LBI Input Current

100

nA

sinking 20

µA (50Ω typ)

0.1

LBO Low Output Voltage

sinking 100

µA (25Ω typ)

0.1

V

LBO Off-Leakage Current

100

nA

0.2

✕

SHDN Input Voltage

0.8

✕

V

Shutdown Input Current

100

nA

ELECTRICAL CHARACTERISTICS (continued)

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.