MAX856 查看數據表（PDF） - Maxim Integrated
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MAX856 Datasheet PDF : 12 Pages
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3.3V/5V or Adjustable-Output,
Step-Up DC-DC Converters
ELECTRICAL CHARACTERISTICS (continued)
(Circuits of Figure 2, VIN = 2.5V, ILOAD = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
–S—H—D—N–, 3/–5– Input Voltage Low
S—H—D—N–, 3/–5– Input Voltage High
1.6
S—H—D—N–, 3/–5–, FB, LBI Input Current LBI = 1.5V, FB = 1.5V, –S—H—D—N– = 0V or 3V, 3/–5– = 0V or 3V
0.4
V
V
±100
nA
FB Voltage
MAX857/MAX859
1.22 1.25 1.28
V
Output Voltage Range
MAX857/MAX859, ILOAD = 0mA (Note 3)
2.7
6.0
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
correlates directly with actual battery supply current, but is reduced in value according to the step-up ratio and efficiency.
VOUT = 3.47V to keep the internal switch open when measuring the current into the device.
Note 3: Minimum value is production tested. Maximum value is guaranteed by design and is not production tested.
__________________________________________Typical Operating Characteristics
(Circuits of Figure 2, TA = +25°C, unless otherwise noted.)
MAX858/MAX859
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 3.3V
100
90
VIN = 2.5V
80
70
VIN = 2.0V
60
VIN = 1.5V
50
40
30
20
10
0
0.001 0.01 0.1 1 10 100
LOAD CURRENT (mA)
1000
MAX858/MAX859
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 5V
100
90
VIN = 3.3V
80
70
60
VIN = 1.5V VIN = 2.5V
50
40
30
20
10
0
0.001 0.01 0.1 1 10 100
LOAD CURRENT (mA)
1000
MAX856/MAX857
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 5V
100
90
VIN = 3.3V
80
70
VIN = 2.0V
60
50
40
30
VIN = 1.5V
20
10
0
0.001 0.01 0.1 1 10 100 1000
LOAD CURRENT (mA)
MAX856/MAX857
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 3.3V
100
90
VIN = 2.5V
80
70
60
VIN = 1.5V
50
VIN = 2.0V
40
30
20
10
0
0.001 0.01 0.1 1 10 100 1000
LOAD CURRENT (mA)
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