Typical operating characteristics (continued) – Rainbow Electronics MAX1775 User Manual
Page 7
MAX1775
Dual-Output Step-Down
DC-DC Converter for PDA/Palmtop Computers
_______________________________________________________________________________________
7
-2.0
-1.6
-1.8
-1.2
-1.4
-0.8
-1.0
-0.6
-0.2
-0.4
0
0
20
30
10
40
50
60
70
80
REFERENCE LOAD REGULATION
MAX1775 toc04
I
REF
(
µA)
V
REF
ACCURACY (%)
MAIN SWITCHING WAVEFORMS,
LIGHT LOAD (100mA)
MAX1775 toc05
1
µs/div
I
LM
500mA/div
V
MAIN
(AC-COUPLED)
20mV/div
LX
5V/div
MAIN SWITCHING WAVEFORMS,
HEAVY LOAD (1A)
MAX1775 toc06
1
µs/div
I
LM
500mA/div
V
MAIN
(AC-COUPLED)
20mV/div
LX
5V/div
0
500mA
1000mA
CORE SWITCHING WAVEFORMS,
LIGHT LOAD (50mA)
MAX1775 toc07
1
µs/div
I
LC
200mA/div
V
CORE
(AC-COUPLED)
20mV/div
LX
5V/div
0
200mA
0
0
4V
CORE SWITCHING WAVEFORMS,
HEAVY LOAD (500mA)
MAX1775 toc08
2
µs/div
500mA
I
LC
250mA/div
LXC
2V/div
V
CORE
(AC-COUPLED)
20mV/div
0
12V
MAIN LINE-TRANSIENT RESPONSE
(5V TO 12V)
MAX1775 toc09
100
µs/div
V
IN
V
MAIN
50mV/div
5V
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
MAIN
= +3.3V, V
CORE
= +1.8V, T
A
= +25°C, unless otherwise noted.)