User guide

MAX17067
Low-Noise Step-Up DC-DC Converter
_______________________________________________________________________________________ 5
0
0.5
2.5
2.0
1.5
1.0
3.5
3.0
4.0
2.5 2.9 3.1 3.32.7 3.5 3.7 3.9
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX17067 toc04
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
NONSWITCHING
SWITCHING
0V
0A
V
OUT
5V/div
INDUCTOR
CURRENT
1A/div
SOFT-START
(R
LOAD
= 18Ω)
MAX17067 toc05
2ms/div
LOAD-TRANSIENT RESPONSE
(I
LOAD
= 10mA TO 200mA)
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100μs/div
L = 3.3μH
R
COMP
= 39kΩ
C
COMP1
= 620pF
I
OUT
200mA/div
10mA
V
OUT
500mA/div
AC-COUPLED
0V
INDUCTOR
CURRENT
500mA/div
0A
I
OUT
1A/div
0.1A
9V
0V
0A
INDUCTOR
CURRENT
1A/div
V
OUT
200mV/div
AC-COUPLED
10μs/div
PULSED LOAD-TRANSIENT RESPONSE
(I
LOAD
= 40mA TO 1.1A)
MAX17067 toc07
L = 3.3μH
R
COMP
= 39kΩ
C
COMP1
= 620pF
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= 3.3V, f
OSC
= 640kHz, T
A
= +25°C, unless otherwise noted.)
LX
5V/div
INDUCTOR
CURRENT
1A/div
0V
0A
1μs/div
SWITCHING WAVEFORMS
(I
LOAD
= 500mA)
MAX17067 toc08