Datasheet

MAX5088/MAX5089
2.2MHz, 2A Buck Converters with an
Integrated High-Side Switch
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V+ = V
L
= 5.2V, T
A
= +25°C, Figures 5 and 6, unless otherwise noted.)
MAX5089 V
L
DROPOUT VOLTAGE
vs. SWITCHING FREQUENCY
MAX5088/89 toc08
SWITCHING FREQUENCY (kHz)
V
L
DROPOUT VOLTAGE (V)
2100
1600
600
1100
0.050
0.100
0.150
0.200
0.300
0.250
0.350
0.400
0
100
V+ = 5.5V
V+ = 5.25V
V+ = 5V
SWITCHING FREQUENCY
vs. R
OSC
MAX5088/89 toc09
RESISTANCE (kΩ)
FREQUENCY (kHz)
605040302010
1000
10,000
100
070
SWITCHING FREQUENCY
vs. TEMPERATURE
MAX5088/89 toc10
TEMPERATURE (°C)
FREQUENCY (kHz)
110
60
10
350
600
850
1100
1350
1600
1850
2100
2350
100
-40
R
OSC
= 20kΩ
R
OSC
= 40kΩ
R
OSC
= 10kΩ
R
OSC
= 6.04kΩ
MAX5089 LINE-TRANSIENT RESPONSE
(I
OUT
= 1A, V
IN
STEP = 14V TO 21V)
MAX5088/89 toc11
100µs/div
V
IN
5V/div
0V
200mV/div
V
OUT
V
OUT
= 3.3V
MAX5089 LOAD-TRANSIENT RESPONSE
(I
OUT
= 0.5A TO 2A)
MAX5088/89 toc13
20µs/div
V
OUT
200mV/div
0A
1A/div
I
OUT
V
IN
= 12V
V
OUT
= 3.3V
MAX5089 LOAD-TRANSIENT RESPONSE
(I
OUT
= 0.2A TO 1A)
MAX5088/89 toc12
20µs/div
V
OUT
100mV/div
0A
500mA/div
I
OUT
V
IN
= 12V
V
OUT
= 3.3V
MAX5089 SOFT-START AND SHUTDOWN
(NO LOAD)
MAX5088/89 toc14
1ms/div
V
OUT
1V/div
0V
0V
5V/div
V
EN
V
IN
= 12V