Low Supply Current, Step-Up DC-DC Converters
with True-Shutdown
ELECTRICAL CHARACTERISTICS (continued)
(V
= +2V, OUT = FB (V = +3.3V), SHDN = LBI = GND, T = -40°C to +85°C, unless otherwise noted.) (Note 3)
OUT A
BATT
PARAMETER
SYMBOL
CONDITIONS
NFET
= +3.3V,
OUT
MIN
MAX
0.3
UNITS
Internal NFET, PFET On-
Resistance
V
I
R
DS(ON)
= ±00mA
LX
PFET
0.45
0.37
0.7
I
MAX±795
MAX±796
MAX±797
0.±9
0.35
0.8
LIM
LX Switch Current Limit (NFET
only)
A
A
±.32
LX Leakage Current
I
V
= 0 and +5.5V, V = +5.5V
OUT
LEAK
LX
Damping Switch On-Resistance
R
±00
400
45
DAMP
Operating Current into OUT
(Note 2)
V
V
= +±.4V
A
FB
FB
Operating Current into BATT
Shutdown Current into BATT
LX Switch Maximum On-Time
LX Switch Minimum Off-Time
= +±.4V, V
= +±V
4
4
A
A
s
LBI
SHDN = BATT, V
= +±V
LBI
t
V
V
V
V
V
= +±V, if current limit not reached
= +±V
2.75
0.7
5.25
±.3
ON
FB
t
s
OFF
FB
= +2V
= LBI
0.8
0.90
0.975
±00
BATT
BATT
LBI Threshold Voltage
LBI Input Current
V
V
LBI
0.875
I
= +0.8V
nA
LBI
LBI
V
= V
= +0.975V,
BATT
LBI
0.±
sinking 20 A (50 typ)
LBO Low Output Voltage
LBO Off-Leakage Current
SHDN Input Voltage
V
V
= V = +±.±V,
BATT
LBI
0.±
sinking ±00 A (25 typ)
V
= +5.5V
±00
nA
V
LBO
✕
0.2
V
IL
V
BATT
✕
0.8
V
V
IH
BATT
Shutdown Input Current
V
= 0 and +5.5V
±00
nA
SHDN
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.
4
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