Rainbow Electronics MAX1627 - Manual (Page 3)

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
V 3.0 16.5 V+ Input Voltage
V 1.25 1.35 Reference
mV 80 120 CS Threshold Voltage
nA 0 50 FB Leakage Current
V 2.9 Undervoltage Lockout
4.80 5.20
µA 24 50 I OUT OUT Input Current
V 1.25 1.35 FB Threshold Voltage
UNITS MIN TYP MAX SYMBOL PARAMETER
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 1 1m 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 1 1m 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