Datasheet

MAX1763
1.5A, Low-Noise, 1MHz, Step-Up
DC-DC Converter
_______________________________________________________________________________________ 7
LIGHT-LOAD SWITCHING WAVEFORMS
MAX1763 toc10
200ns/div
A
B
C
V
IN
= 1.1V, V
OUT
= 3.3V, I
OUT
= 20mA
A: LX NODE, 5V/div
B: INDUCTOR CURRENT, 0.1A/div, AC COUPLED
C: OUTPUT RIPPLE, 0.1V/div, AC COUPLED
LOAD-TRANSIENT RESPONSE
MAX1763 toc11
100μs/div
A
B
V
IN
= 2.4V, V
OUT
= 3.3V, I
OUT
= 0.2A TO 1.35A
A: I
OUT
, 0.5A/div
B: V
OUT
, 100mV/div, AC-COUPLED
LINE-TRANSIENT RESPONSE
MAX1763 toc12
40μs/div
A
B
V
IN
= 2.4V TO 1.4V, I
OUT
= 70mA
A: V
IN
, 1V/div
B: V
OUT
, 5mV/div, AC-COUPLED
POWER-ON DELAY
MAX1763 toc13
100μs/div
ONA
5V/div
I
IN
0.5A/div
V
OUT
2V/div
I
L
= 10mA
STARTUP WAVEFORMS
NO SOFT-START
MAX1763 toc14
2ms/div
V
IN
= 1.2V, V
OUT
= 3.3V, R
LOAD
= 3kΩ
V
OUT
2V/div
ONA
5V/div
I
IN
1A/div
STARTUP WAVEFORMS
USING SOFT-START
MAX1763 toc15
2ms/div
V
IN
= 1.2V, V
OUT
= 3.3V, R
SS
= 510kΩ, C
SS
= 0.1μF, R
LOAD
= 3kΩ
V
OUT
2V/div
ONA
5V/div
I
IN
1A/div
0.01 1010.1
NOISE SPECTRUM
8
2
0
6
4
MAX1763 toc16
FREQUENCY (MHz)
NOISE (mV
RMS
)
V
IN
= 2.4V
V
OUT
= 3.3V
Typical Operating Characteristics (continued)
(Circuit of Figure 2, V
IN
= +3.6V, V
OUT
= +5V, T
A
= +25°C, unless otherwise noted.)