5V/3.3V or Adjustable, 100% Duty-Cycle,
High-Efficiency, Step-Down DC-DC Controllers
MAX1626/MAX1627
ELECTRICAL CHARACTERISTICS
(V+ = +3V to +16.5V, SHDN =
3/5
= 0V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
Input Voltage
Supply Current into V+
Undervoltage Lockout
Output Voltage
OUT Input Current
FB Threshold Voltage
FB Leakage Current
CS Threshold Voltage
Reference
I
LOAD
= 0µA
V
OUT
I
OUT
Circuit of Figure 1,
3/5
= V+
Circuit of Figure 1,
3/5
= 0V
MAX1626,
3/5
= V+, output forced to 5V
MAX1627, includes hysteresis
MAX1627
4.80
3.16
24
1.25
0
80
1.25
SYMBOL
V+
I
OUT
Operating, no load
V+ = SHDN = 16.5V (shutdown)
CONDITIONS
MIN
3.0
TYP
MAX
16.5
100
2
2.9
5.20
3.44
50
1.35
50
120
1.35
UNITS
V
µA
V
V
µA
V
nA
mV
V
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.
__________________________________________Typical Operating Characteristics
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX1626-11
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= +3.3V)
MAX1626-05
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= +5V)
90
80
A
B
C
MAX1626-03
0.45
0.40
DROPOUT VOLTAGE (V)
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0
0.5
1.0
1.5
2.0
5V SETTING
V
OUT
= +4.8V
3.3V SETTING
V
OUT
= +3.17V
100
90
80
EFFICIENCY (%)
B
A
C
100
60
50
40
30
20
10
0
D E F
EFFICIENCY (%)
70
70
60
50
40
30
20
10
0
D E
CIRCUIT OF FIGURE 1
0.1m
1m
10m
A: V+ = +4.3V
B: V+ = +5V
C: V+ = +8V
D: V+ = +10V
E: V+ = +12V
F: V+ = +15V
100m
1
10
CIRCUIT OF FIGURE 1
0.1m
1m
10m
100m
A: V+ = +6V
B: V+ = +8V
C: V+ = +10V
D: V+ = +12V
E: V+ = +15V
1
10
2.5
LOAD (A)
LOAD CURRENT (A)
LOAD CURRENT (A)
_______________________________________________________________________________________
3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
