MAX608 Maxim, MAX608 Datasheet - Page 3

• Manufacturer Part Number: MAX608
• Description: 5V or Adjustable / Low-Voltage / Step-Up DC-DC Controller
• Manufacturer: Maxim

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
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
ELECTRICAL CHARACTERISTICS (continued)
(V
T
(T
__________________________________________Typical Operating Characteristics
A
Current-Limit Trip Level
CS Input Current
EXT Rise Time
EXT Fall Time
EXT On-Resistance
OUT
A
= +25°C.)
100
90
80
70
60
= +25°C, unless otherwise noted.)
700
600
500
400
300
200
100
0
= 5V, I
PARAMETER
1
1.8
voltage set point is +3V.
V
CIRCUIT OF FIGURE 2a
EXTERNAL FET THRESHOLD LIMITS
FULL-LOAD START-UP BELOW 3.7V
EFFICIENCY vs. LOAD CURRENT
OUT
MINIMUM START-UP VOLTAGE (V)
2.2
LOAD
= 5V
LOAD CURRENT (mA)
10
MINIMUM START-UP
V
LOAD CURRENT vs.
2.6
IN
(V
INPUT VOLTAGE
= 0mA, T
= 3.5V
_______________________________________________________________________________________
OUT
V
IN
3.0
= 2.0V
= 5V)
100
3.4
SYMBOL
A
V
V
IN
= -40°C to +85°C where indicated. T
V
I
IN
CS
CS
= 4.0V
= 3.0V
3.8
1000
4.0
V
V
V
EXT = high or low
OUT
OUT
OUT
5V or Adjustable, Low-Voltage,
= 3V to 16.5V
= 5V, 1nF from EXT to GND
= 5V, 1nF from EXT to GND
100
90
80
70
60
500
400
300
200
100
0
1
1.8
V
IN
V
CIRCUIT OF FIGURE 2b
EXTERNAL FET THRESHOLD LIMITS
FULL-LOAD START-UP BELOW 3.6V
EFFICIENCY vs. LOAD CURRENT
OUT
= 9.0V
V
IN
MINIMUM START-UP VOLTAGE (V)
= 12V
2.2
= 3.0V
CONDITIONS
LOAD CURRENT (mA)
10
MINIMUM START-UP
Step-Up DC-DC Controller
LOAD CURRENT vs.
2.6
(V
INPUT VOLTAGE
V
IN
OUT
T
T
A
A
= 6.0V
= -25°C to +85°C
= -40°C to +85°C (Note 1)
3.0
= 12V)
100
A
V
IN
= -25°C to +85°C for all other limits. Typical values are at
3.4
= 2.0V
V
IN
= 5.0V
3.8
1000
FB
4.0
trip level, and does not include resistor tolerance.
100
90
80
70
60
200
150
100
50
0
1
MIN
85
80
0
EFFICIENCY vs. LOAD CURRENT
1
LOAD CURRENT (mA)
10
TYP
0.01
100
vs. INPUT VOLTAGE
INPUT VOLTAGE (V)
50
50
15
(V
SUPPLY CURRENT
OUT
2
= 3.3V)
V
V
IN
IN
MAX
100
115
120
= 3.0V
±1
30
= 2.0V
3
4
UNITS
1000
mV
ns
Ω
A
5
3