MAX856 Maxim, MAX856 Datasheet - Page 3

• Manufacturer Part Number: MAX856
• Description: 3.3V/5V or Adjustable-Output / Step-Up DC-DC Converters
• Manufacturer: Maxim

ELECTRICAL CHARACTERISTICS (continued)
(Circuits of Figure 2, V
Note 2: Supply current from the 3.3V output is measured with an ammeter between the 3.3V output and OUT pin. This current
Note 3: Minimum value is production tested. Maximum value is guaranteed by design and is not production tested.
(Circuits of Figure 2, T
__________________________________________Typical Operating Characteristics
–
S
S
S
FB Voltage
Output Voltage Range
—
—
—
H
H
H
—
—
—
D
D
D
—
—
—
N
N
N
–
–
–
, 3/
, 3/
, 3/
correlates directly with actual battery supply current, but is reduced in value according to the step-up ratio and efficiency.
V
OUT
–
–
–
5
5
5
–
–
–
, FB, LBI Input Current
Input Voltage Low
Input Voltage High
= 3.47V to keep the internal switch open when measuring the current into the device.
100
100
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
0
0
_______________________________________________________________________________________
0.001
IN
0.001
A
= +25°C, unless otherwise noted.)
= 2.5V, I
EFFICIENCY vs. OUTPUT CURRENT
EFFICIENCY vs. OUTPUT CURRENT
0.01
0.01
LOAD CURRENT (mA)
LOAD CURRENT (mA)
MAX858/MAX859
MAX856/MAX857
LOAD
0.1
0.1
V
LBI = 1.5V, FB = 1.5V,
MAX857/MAX859
MAX857/MAX859, I
V
OUT
OUT
= 0mA, T
V
= 3.3V
1
1
IN
= 5V
V
IN
= 1.5V
= 2.0V
10
10
V
IN
V
V
= 2.0V
A
IN
V
IN
IN
100
= T
= 3.3V
100
= 1.5V
3.3V/5V or Adjustable-Output,
= 2.5V
MIN
LOAD
1000
1000
to T
–
S
—
Step-Up DC-DC Converters
H
—
= 0mA (Note 3)
MAX
D
—
N
–
, unless otherwise noted. Typical values are at T
= 0V or 3V, 3/
100
100
90
30
–
5
90
80
70
60
50
40
30
20
10
80
70
60
50
40
20
10
–
0
0
0.001
0.001
= 0V or 3V
EFFICIENCY vs. OUTPUT CURRENT
EFFICIENCY vs. OUTPUT CURRENT
0.01
0.01
LOAD CURRENT (mA)
LOAD CURRENT (mA)
MAX858/MAX859
MAX856/MAX857
0.1
0.1
V
V
OUT
OUT
V
1.22
IN
= 3.3V
1
1.6
2.7
1
= 5V
= 1.5V
V
IN
V
10
10
IN
= 1.5V
V
V
= 2.0V
IN
IN
V
1.25
= 3.3V
IN
= 2.5V
100
100
= 2.5V
A
1000
1000
= +25°C.)
±100
1.28
0.4
6.0
nA
V
V
V
V
3