Datasheet

MAX8655
Highly Integrated, 25A, Wide-Input,
Internal MOSFET, Step-Down Regulator
_______________________________________________________________________________________ 5
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
LOAD REGULATION
(CIRCUIT OF FIGURE 4)
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
MAX8655 toc01
0 5 10 15 20 25
3.26
3.27
3.28
3.29
3.30
3.31
3.32
3.33
3.34
V
IN
= 12V
LINE REGULATION
(CIRCUIT OF FIGURE 4)
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
MAX8655 toc02
5 101520
3.26
3.27
3.28
3.29
3.30
3.31
3.32
3.33
3.34
12A LOAD
FB VOLTAGE vs. EXPOSED PAD TEMPERATURE
(CIRCUIT OF FIGURE 4)
EXPOSED PAD TEMPERATURE (°C)
FB VOLTAGE (V)
MAX8655 toc03
-40 0 40 80 120
0.680
0.685
0.690
0.695
0.700
0.705
0.710
0.715
0.720
7.5A LOAD
OSCILLATOR FREQUENCY vs. INPUT VOLTAGE
(CIRCUIT OF FIGURE 4)
INPUT VOLTAGE (V)
OSCILLATOR FREQUENCY (kHz)
MAX8655 toc04
8 13182328
300
310
320
330
340
350
360
370
380
390
400
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
R
FSYNC
= 76.8kΩ
I
OUT
5A/div
V
OUT
50mV/div
(AC-COUPLED)
40
µ
s/div
STEP-LOAD RESPONSE
(CIRCUIT OF FIGURE 3)
MAX8655 toc05
V
OUT
= 1.2V
V
IN
I
LX
10V/div
1V/div
5A/div
2ms/div
POWER-UP WAVEFORMS
(CIRCUIT OF FIGURE 4)
MAX8655 toc06
V
POK
V
OUT
5V/div
V
POK
I
LX
10V/div
2V/div
10A/div
200µs/div
POWER-DOWN WAVEFORMS
(CIRCUIT OF FIGURE 4)
MAX8655 toc07
V
IN
V
OUT
5V/div
V
EN
I
LX
5V/div
2V/div
10A/div
2ms/div
ENABLE WAVEFORMS
(CIRCUIT OF FIGURE 4)
MAX8655 toc08
V
POK
V
OUT
5V/div