High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
4
Typical Operating Characteristics
(L = 22µH, CIN = 47µF, COUT = 47µF
0.1µF, CREF = 0.1µF, TA = +25°C, unless otherwise noted.)
VLBO = 5.5V, VLBI = 5.5V
VSHDN = 0 or VOUT
HWD20012, CLSEL = OUT
CONDITIONS
µA
1
I LBO
LBO Off Leakage Current
nA
75
I SHDN
SHDN Input Current
µA
3
ICLSEL
CLSEL Input Current
UNITS
MIN
MAX
SYMBOL
PARAMETER
ELECTRICAL CHARACTERISTICS (continued)
(VBATT = 2V, FB = OUT, RL =
∞, TA = -40°C to +85°C, unless otherwise noted.) (Note 4)
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.
100
0
0.01
0.1
1
10
100
1000
EFFICIENCY vs. LOAD CURRENT
20
30
10
LOAD CURRENT (mA)
40
50
60
70
90
80
VIN = 1.2V
VOUT = 5V
ILIMIT = 500mA
VIN = 2.4V
VIN = 3.6V
100
0
0.01
0.1
1
10
100
1000
EFFICIENCY vs. LOAD CURRENT
20
30
10
LOAD CURRENT (mA)
40
50
60
70
90
80
VIN = 1.2V
VOUT = 5V
ILIMIT = 1A
VIN = 2.4V
VIN = 3.6V
100
0
0.01
0.1
1
10
100
1000
EFFICIENCY vs. LOAD CURRENT
20
30
10
LOAD CURRENT (mA)
40
50
60
70
90
80
VIN = 1.2V
VOUT = 3.3V
ILIMIT = 500mA
VIN = 2.4V
100
0
0.01
0.1
1
10
100
1000
EFFICIENCY vs. LOAD CURRENT
20
30
10
LOAD CURRENT (mA)
40
50
60
70
90
80
VIN = 1.2V
VOUT = 3.3V
ILIMIT = 1A
VIN = 2.4V
1.290
1.292
1.296
1.294
1.298
1.300
-40
0
-20
20
40
60
80
100
REFERENCE OUTPUT VOLTAGE
vs. TEMPERATURE
TEMPERATURE (°C)
IREF = 0
IREF = 100
µA
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