Typical operating characteristics (continued) – Rainbow Electronics MAX1708 User Manual
Page 6
MAX1708
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
6
_______________________________________________________________________________________
1000
10,000
0
0.2
0.4
0.6
0.8
1.2
1.0
1.6
1.4
1.8
1
10
100
STARTUP VOLTAGE vs. LOAD CURRENT
(V
OUT
= 5V)
MAX1708 toc06a
LOAD CURRENT (mA)
STARTUP VOLTAGE (V)
T
A
= -40
°C
T
A
= +25
°C
T
A
= +85
°C
2.5
2.0
1.5
1.0
0.5
0
1
100
1000
10
10,000
STARTUP VOLTAGE vs. LOAD CURRENT
(V
OUT
= 3.3V)
MAX1708 toc06b
LOAD CURRENT (mA)
STARTUP VOLTAGE (V)
T
A
= -40
°C
T
A
= +25
°C
T
A
= +85
°C
2
1
0
-1
-2
-40
10
-15
35
60
85
SWITCHING FREQUENCY
vs. TEMPERATURE
MAX1708 toc07
TEMPERATURE (
°C)
FREQUENCY CHANGE (%)
V
OUT
= 3.3V
PLOT NORMALIZED TO 25
°C
4000
0
0.1
1
10
NOISE vs. FREQUENCY
MAX1708 toc08
FREQUENCY (MHz)
NOISE (
µ
V)
500
1000
2000
1500
3000
3500
2500
RESOLUTION = 1kHz
50
0
250
200
150
100
300
SWITCH CURRENT LIMIT
vs. SS/LIM RESISTANCE
MAX1708 toc09
SS/LIM RESISTANCE (k
Ω)
SWITCH CURRENT LIMIT (A)
1
2
0
4
5
3
6.0
5.5
5.0
4.5
4.0
-40
10
-15
35
60
85
SWITCH CURRENT LIMIT
vs. TEMPERATURE
MAX1708 toc10
TEMPERATURE (
°C)
SWITCH CURRENT LIMIT (A)
V
IN
= 3.3V, V
OUT
= 5V
1
µs/div
HEAVY SWITCHING WAVEFORM
V
OUT
AC-COUPLED
50mV/div
5V
4A
2A
5V
0
0
V
LX
5V/div
I
L
2A/div
MAX1708 toc11
100
µs/div
LINE TRANSIENT RESPONSE
V
OUT
AC-COUPLED
50mV/div
3.5V
3V
5V
V
IN
500mV/div
MAX1708 toc12
Typical Operating Characteristics (continued)
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)