MAX1674 Datasheet, PDF (4/12 Pages) Maxim Integrated Products – High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters

High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
ELECTRICAL CHARACTERISTICS (continued)
(V_BATT = 2V, FB = OUT, R_L = ∞, T_A = -40°C to +85°C, unless otherwise noted.) (Note 4)
PARAMETER
CLSEL Input Current
SHDN Input Current
LBO Off Leakage Current
SYMBOL
I_CLSEL
I _SHDN
I _LBO
CONDITIONS
MAX1676, CLSEL = OUT
V_SHDN = 0 or V_OUT
V_LBO = 5.5V, V_LBI = 5.5V
MIN
MAX UNITS
3
µA
75
nA
1
µA
Note 1: Start-up voltage operation is guaranteed with the addition of a Schottky MBR0520 external diode between the input and
output.
Note 2: Steady-state output current indicates that the device maintains output voltage regulation under load. See Figures 5 and 6.
Note 3: Device is bootstrapped (power to the IC comes from OUT). This correlates directly with the actual battery supply.
Note 4: Specifications to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(L = 22µH, C_IN = 47µF, C_OUT = 47µF 0.1µF, C_REF = 0.1µF, T_A = +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
100
90
80
V_IN = 3.6V
V_IN = 2.4V
70
60
V_IN = 1.2V
50
40
30
20
10
0
0.01 0.1
1
V_OUT = 5V
I_LIMIT = 500mA
10 100 1000
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
100
90
80
70
V_IN = 2.4V
V_IN = 3.6V
60
V_IN = 1.2V
50
40
30
20
10
0
0.01 0.1
1
V_OUT = 5V
I_LIMIT = 1A
10 100 1000
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
100
90
80
70
V_IN = 1.2V
V_IN = 2.4V
60
50
40
30
20
10
0
0.01 0.1
1
V_OUT = 3.3V
I_LIMIT = 500mA
10 100 1000
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
100
90
80
70
V_IN = 1.2V
V_IN = 2.4V
60
50
40
30
20
10
0
0.01 0.1
1
V_OUT = 3.3V
I_LIMIT = 1A
10 100 1000
LOAD CURRENT (mA)
REFERENCE OUTPUT VOLTAGE
vs. TEMPERATURE
1.300
1.298
1.296
I_REF = 0
1.294
1.292
I_REF = 100µA
1.290
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
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