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MAX8544EEP+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27
MAX8543/MAX8544
Step-Down Controllers with Prebias Startup,
Lossless Sensing, Synchronization, and OVP
_______________________________________________________________________________________ 7
EFFICIENCY vs. LOAD CURRENT
WITH 12V INPUT
MAX8543 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
101
10
20
30
40
50
60
70
80
90
100
0
0.1 100
V
OUT
= 3.3V
V
OUT
= 2.5V
V
OUT
= 1.8V
f
S
= 600kHz
EFFICIENCY vs. LOAD CURRENT
WITH 3.3V INPUT
MAX8543 toc02
LOAD CURRENT (A)
EFFICIENCY (%)
101
10
20
30
40
50
60
70
80
90
100
0
0.1 100
V
OUT
= 2.5V
V
OUT
= 1.8V
f
S
= 500kHz
V
OUT
= 1.5V
LOAD REGULATION WITH 12V INPUT
MAX8543 toc03
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
12963
2.46
2.47
2.48
2.49
2.50
2.51
2.52
2.53
2.54
2.55
2.45
015
LINE REGULATION WITH 12V INPUT
AND 2.5V OUTPUT
MAX8543 toc04
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
12.612.011.4
2.492
2.494
2.496
2.498
2.500
2.502
2.504
2.506
2.508
2.510
2.490
10.8 13.2
NO LOAD
15A LOAD
LINE REGULATION
3.0V TO 3.6V INPUT
MAX8543 toc05
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
3.53.43.33.23.1
2.44
2.46
2.48
2.50
2.52
2.54
2.42
3.0 3.6
NO LOAD
15A LOAD
f
S
= 350kHz
15A LOAD
f
S
= 500kHz
OSCILLATOR FREQUENCY
vs. INPUT VOLTAGE
MAX8543 toc06
INPUT VOLTAGE (V)
OSCILLATOR FREQUENCY (kHz)
5.04.54.03.5
420
440
460
480
500
520
540
560
580
600
400
3.0 5.5
T
A
= +85
°
C
T
A
= +25
°
C
T
A
= -40
°
C
R6 = 53.6k
Ω
OSCILLATOR FREQUENCY
vs. INPUT VOLTAGE
MAX8543 toc07
INPUT VOLTAGE (V)
OSCILLATOR FREQUENCY (kHz)
11.59.57.5
520
540
560
580
600
620
640
660
680
700
500
5.5 13.5
R6 = 42.2kΩ
T
A
= +85
°
C
T
A
= -40
°
C
T
A
= +25
°
C
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
MAX8543/MAX8544
Step-Down Controllers with Prebias Startup,
Lossless Sensing, Synchronization, and OVP
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
MAX8544 STEP-LOAD RESPONSE
7.5A TO 15A TO 7.5A (5A/μs)
MAX8543 toc08
V
OUT
I
OUT
50mV/div
AC-COUPLED
0
5A/div
10
μ
s/div
MAX8544 STEP-LOAD RESPONSE
1.5A TO 15A TO 1.5A (5A/μs)
MAX8543 toc09
V
OUT
I
OUT
100mV/div
AC-COUPLED
0
5A/div
10
μ
s/div
MAX8544 POWER-UP WAVEFORMS
MAX8543 toc10
V
IN
V
POK
5V/div
0
10A/div
2ms/div
V
OUT
I
L
2V/div
5V/div
MAX8544 POWER-DOWN WAVEFORMS
MAX8543 toc11
V
IN
V
POK
5V/div
0
10A/div
2ms/div
V
OUT
I
L
2V/div
2V/div
MAX8543 POWER-UP WAVEFORMS
MAX8543 toc12
V
IN
2V/div
0
10A/div
2ms/div
V
OUT
I
L
1V/div
MAX8543 POWER-DOWN WAVEFORMS
MAX8543 toc13
V
IN
2V/div
0
10A/div
2ms/div
V
OUT
I
L
1V/div
MAX8543/MAX8544
Step-Down Controllers with Prebias Startup,
Lossless Sensing, Synchronization, and OVP
_______________________________________________________________________________________ 9
MAX8544 ENABLE WAVEFORMS
MAX8543 toc14
V
EN
5V/div
0
10A/div
2ms/div
V
OUT
I
L
2V/div
V
POK
5V/div
FSYNC AND SYNCO WAVEFORMS
MAX8543 toc15
V
OUT
1V/div
5V/div
2
μ
s/div
V
LX
V
SYNCO
10V/div
V
FSYNC
5V/div
SHORT CIRCUIT AND RECOVERY
MAX8543 toc16
V
IN
10V/div
12V
0
1ms/div
V
OUT
I
IN
1V/div
I
L
10A/div
0
10A/div
OVERVOLTAGE PROTECTION
WITH 15A LOAD
MAX8543 toc17
V
OUT
5V/div
40
μ
s/div
V
DH
V
DL
1V/div
10V/div
0V
0V
5V
5V
PREBIASED STARTUP
(OUTPUT PREBIASED AT 1.5V)
MAX8543 toc18
V
IN
5V/div
1ms/div
V
LX
V
DL
2.5V
10V/div
V
OUT
5V/div
500mV/div
1.5V
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27

MAX8544EEP+

Mfr. #:
Buy MAX8544EEP+
Manufacturer:
Maxim Integrated
Description:
Switching Controllers Step-Down Controller
Lifecycle:
New from this manufacturer.
Delivery:
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