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Rainbow-electronics MAX1627 Manual de usuario Pagina 3

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MAX1626/MAX1627
5V/3.3V or Adjustable, 100% Duty-Cycle,
High-Efficiency, Step-Down DC-DC Controllers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS
(V+ = +3V to +16.5V, SHDN = 3/5 = 0V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
Note 1: V+ must exceed V
OUT
to maintain regulation.
Note 2: Specifications from 0°C to -40°C are guaranteed by design, not production tested.
V+ = SHDN = 16.5V (shutdown)
Operating, no load
I
LOAD
= 0µA
MAX1627
Circuit of Figure 1, 3/5 = V+
MAX1626, 3/5 = V+, output forced to 5V
MAX1627, includes hysteresis
CONDITIONS
µA
2
I
OUT
Supply Current into V+
100
V3.0 16.5V+Input Voltage
V1.25 1.35Reference
mV80 120CS Threshold Voltage
nA050FB Leakage Current
V2.9Undervoltage Lockout
4.80 5.20
µA24 50I
OUT
OUT Input Current
V1.25 1.35FB Threshold Voltage
UNITSMIN TYP MAXSYMBOLPARAMETER
Circuit of Figure 1, 3/5 = 0V
V
3.16 3.44
V
OUT
Output Voltage
__________________________________________Typical Operating Characteristics
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
100
0
0.1m 100m 11m 10m 10
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= +3.3V)
20
10
MAX1626-05
LOAD CURRENT (A)
EFFICIENCY (%)
40
30
60
50
70
80
90
A: V+ = +4.3V
B: V+ = +5V
C: V+ = +8V
D: V+ = +10V
E: V+ = +12V
F: V+ = +15V
CIRCUIT OF FIGURE 1
A
B
C
D E F
100
0
0.1m 100m 11m 10m 10
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= +5V)
20
10
MAX1626-03
LOAD CURRENT (A)
EFFICIENCY (%)
40
30
60
50
70
80
90
A: V+ = +6V
B: V+ = +8V
C: V+ = +10V
D: V+ = +12V
E: V+ = +15V
CIRCUIT OF FIGURE 1
A
B
C
D
E
0.45
0
0 0.5 1.0 1.5 2.0 2.5
DROPOUT VOLTAGE
vs. LOAD CURRENT
0.05
0.10
0.35
0.25
0.30
0.40
MAX1626-11
LOAD (A)
DROPOUT VOLTAGE (V)
0.20
0.15
3.3V SETTING
V
OUT
= +3.17V
5V SETTING
V
OUT
= +4.8V
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