5V or Adjustable, Low-Voltage,
Step-Up DC-DC Controller
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
Current-Limit Trip Level
CS Input Current
EXT Rise Time
EXT Fall Time
EXT On-Resistance
SYMBOL
V
CS
I
CS
V
OUT
= 5V, 1nF from EXT to GND
V
OUT
= 5V, 1nF from EXT to GND
EXT = high or low
CONDITIONS
V
OUT
= 3V to 16.5V
T
A
= -25°C to +85°C
T
A
= -40°C to +85°C (Note 1)
MIN
85
80
0.01
50
50
15
30
TYP
100
MAX
115
120
±1
UNITS
mV
µA
ns
Ω
MAX608
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.
__________________________________________Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 5V)
MAX608-01
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 12V)
MAX608-02
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 3.3V)
MAX608-03
100
V
IN
= 4.0V
90
EFFICIENCY (%)
V
IN
= 3.5V
100
V
IN
= 9.0V
90
EFFICIENCY (%)
V
IN
= 6.0V
V
IN
= 5.0V
100
90
EFFICIENCY (%)
V
IN
= 3.0V
80
V
IN
= 3.0V
70
V
IN
= 2.0V
80
V
IN
= 3.0V
V
IN
= 2.0V
80
70
70
V
IN
= 2.0V
60
1
10
100
1000
LOAD CURRENT (mA)
60
1
10
100
1000
LOAD CURRENT (mA)
60
1
10
100
1000
LOAD CURRENT (mA)
LOAD CURRENT vs.
MINIMUM START-UP
INPUT VOLTAGE
MAX608-04
LOAD CURRENT vs.
MINIMUM START-UP
INPUT VOLTAGE
V
OUT
= 12V
CIRCUIT OF FIGURE 2b
EXTERNAL FET THRESHOLD LIMITS
FULL-LOAD START-UP BELOW 3.6V
MAX608-05
SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX608-06
700
600
LOAD CURRENT (mA)
500
400
300
200
100
0
1.8
2.2
2.6
3.0
3.4
3.8
V
OUT
= 5V
CIRCUIT OF FIGURE 2a
EXTERNAL FET THRESHOLD LIMITS
FULL-LOAD START-UP BELOW 3.7V
500
200
SUPPLY CURRENT (µA)
400
LOAD CURRENT (mA)
150
300
100
200
50
100
0
4.0
1.8
2.2
2.6
3.0
3.4
3.8
4.0
MINIMUM START-UP VOLTAGE (V)
MINIMUM START-UP VOLTAGE (V)
0
0
1
2
3
4
5
INPUT VOLTAGE (V)
_______________________________________________________________________________________
3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
