MAX608
5V or Adjustable, Low-Voltage,
Step-Up DC-DC Controller
_______________________________________________________________________________________
3
0
50
100
150
200
SUPPLY CURRENT
vs. INPUT VOLTAGE
INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)
01 2345
MAX608-06
60
1 10 100 1000
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 12V)
70
80
90
100
MAX608-02
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN
= 6.0V
V
IN
= 5.0V
V
IN
= 3.0V
V
IN
= 9.0V
V
IN
= 2.0V
60
1 10 100 1000
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 3.3V)
70
80
90
100
MAX608-03
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN
= 2.0V
V
IN
= 3.0V
60
1 10 100 1000
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 5V)
70
80
90
100
MAX608-01
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN
= 4.0V
V
IN
= 3.5V
V
IN
= 3.0V
V
IN
= 2.0V
0
700
600
500
400
300
200
100
LOAD CURRENT vs.
MINIMUM START-UP
INPUT VOLTAGE
MAX608-04
MINIMUM START-UP VOLTAGE (V)
LOAD CURRENT (mA)
1.8 2.2 2.6 3.0 3.4 3.8 4.0
V
OUT
= 5V
CIRCUIT OF FIGURE 2a
EXTERNAL FET THRESHOLD LIMITS
FULL-LOAD START-UP BELOW 3.7V
0
500
400
300
200
100
LOAD CURRENT vs.
MINIMUM START-UP
INPUT VOLTAGE
MINIMUM START-UP VOLTAGE (V)
LOAD CURRENT (mA)
MAX608-05
V
OUT
= 12V
CIRCUIT OF FIGURE 2b
EXTERNAL FET THRESHOLD LIMITS
FULL-LOAD START-UP BELOW 3.6V
1.8 2.2 2.6 3.0 3.4 3.8 4.0
ELECTRICAL CHARACTERISTICS (continued)
(V
OUT
= 5V, I
LOAD
= 0mA, T
A
= -40°C to +85°C where indicated. T
A
= -25°C to +85°C for all other limits. Typical values are at
T
A
= +25°C.)
PARAMETER
SYMBOL CONDITIONS
MIN TYP MAX
UNITS
Current-Limit Trip Level V
CS
V
OUT
= 3V to 16.5V
85 100 115
mV
CS Input Current I
CS
0.01 ±1
µA
EXT Rise Time V
OUT
= 5V, 1nF from EXT to GND 50
ns
EXT Fall Time V
OUT
= 5V, 1nF from EXT to GND 50
Note 1: Limits over this temperature range are guaranteed by design.
Note 2: The MAX608 must be operated in bootstrapped mode with OUT connected to the DC-DC circuit output. The minimum output
voltage set point is +3V.
Note 3: Output voltage guaranteed using preset voltages. See Figures 4a–4d for output current capability versus input voltage.
Note 4: Output voltage line and load regulation depend on external circuit components.
Note 5: Operation in the external-feedback mode is guaranteed to be accurate to the V
FB
trip level, and does not include resistor tolerance.
80 120
__________________________________________Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
T
A
= -40°C to +85°C (Note 1)
EXT On-Resistance EXT = high or low 15 30 Ω
T
A
= -25°C to +85°C
(31 Seiten)
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