Datasheet

High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
ELECTRICAL CHARACTERISTICS
(V
BATT
= 2V, FB = OUT, R
L
= ∞, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 4)
V
OUT
= 2V, I
LOAD
= 1mA
V
OUT
= 3.3V, I
LOAD
= 200mA
SHDN = GND
CONDITIONS
%
85
Efficiency
90
µA
0.1 1
Shutdown Current into OUT
UNITSMIN TYP MAXSYMBOLPARAMETER
MAX1676, V
BATT
= 2V
V
LBO
= 5.5V, V
LBI
= 5.5V
V
LBI
= 0, I
SINK
= 1mA
V
SHDN
= 0 or V
OUT
V
FB
= 1V, V
OUT
= 3.3V
MAX1676, CLSEL = OUT
V
LBI
= 1.4V
V
FB
= 1.4V
V
FB
= 1V, V
OUT
= 3.3V
0.8V
OUT
V
IH
0.2V
OUT
V
IL
CLSEL Input Voltage
V
0.8V
OUT
V
IH
0.2V
OUT
V
IL
SHDN Input Voltage
Ω88 150Damping Switch Resistance
µA
0.07 1
I
LBO
LBO Off Leakage Current
V
0.2 0.4
LBO Low Output Voltage
nA
0.07 50
I
SHDN
SHDN Input Current
µA
1.4 3
I
CLSEL
CLSEL Input Current
nA
150
I
LBI
LBI Input Current
nA
0.03 50
I
FB
FB Input Current
µs
0.8 1 1.2
t
OFF
LX Switch Off-Time
µs
347
t
ON
LX Switch On-Time
V
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= 2V, FB = OUT (V
OUT
= 3.3V), R
L
= ˙∞, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
FB = GND
FB = OUT
V
FB
= 1V, V
OUT
= 3.3V
V
FB
= 1V, V
OUT
= 3.3V
SHDN = GND
V
FB
= 1.4V, V
OUT
= 3.3V
I
REF
= 0
MAX1675, MAX1676 (CLSEL = GND)
MAX1674, MAX1676 (CLSEL = OUT)
CONDITIONS
0.36 0.69
A
0.75 1.25
I
LIM
LX Switch Current
Limit (NFET)
V2.20 5.5Output Voltage Range
V
4.75 5.25
3.13 3.47
V
OUT
Output Voltage
µs0.75 1.25t
OFF
LX Switch Off-Time
µs2.7 7.0t
ON
LX Switch On-Time
µA1Shutdown Current into OUT
µA40
Operating Current into OUT
(Note 3)
V1.2675 1.3325V
REF
Reference Voltage
V1.2675 1.3325FB, LBI Thresholds
Ω0.6R
DS(ON)
Internal NFET, PFET
On-Resistance
UNITSMIN MAXSYMBOLPARAMETER
V
FB
= 1.4V, V
OUT
= 3.3V µA
16 35
Operating Current into OUT
(Note 3)
Maxim Integrated
3
MAX1674/MAX1675/MAX1676