MAX8734 Maxim Integrated Products, MAX8734 Datasheet - Page 10

• Manufacturer Part Number: MAX8734
• Description: (MAX8732 - MAX8734) Main Power-Supply Controllers
• Manufacturer: Maxim Integrated Products

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High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
10
(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = V
R
5.00
4.99
4.98
4.97
4.96
4.95
3.3V
CS
10V
5A
5A
5V
0
0
0
0
0
0
0
0
= 7mΩ, V
0
______________________________________________________________________________________
LDO5 REGULATOR OUTPUT VOLTAGE
REF, LDO3, AND LDO5 POWER-UP
10
SOFT-START WAVEFORMS
20 30 40
LDO5 OUTPUT CURRENT (mA)
vs. OUTPUT CURRENT
ILIM
_ = 0.5V, T
200µs/div
400µs/div
50 60 70
A
MAX8732/3/4 toc25
MAX8732/3/4 toc22
= +25°C, unless otherwise noted.)
80
90
100
I
5A/div
I
5A/div
OUT3
5V/div
OUT5
5V/div
V+
10V/div
LDO5
2V/div
LDO3
2V/div
REF
1V/div
L5
L3
3.350
3.348
3.346
3.344
3.342
3.340
3.338
3.336
3.334
3.332
3.330
3.3V
3.3V
Typical Operating Characteristics (continued)
5V
5V
5V
5V
5V
0
0
0
0
0
0
0
0
LDO3 REGULATOR OUTPUT VOLTAGE
SWITCHING
10
DELAYED START WAVEFORMS
SHUTDOWN WAVEFORMS
20 30 40
LDO3 OUTPUT CURRENT (mA)
vs. OUTPUT CURRENT
(ON5 = REF)
200µs/div
10ms/div
50 60 70
MAX8732/3/4 toc26
MAX8732/3/4 toc23
80
90
100
ON3
5V/div
OUT3
5V/div
OUT5
5V/div
DL3
5V/div
ON5
2V/div
OUT3
2V/div
OUT5
2V/div
2.005
2.004
2.003
2.002
2.001
2.000
1.999
1.998
1.997
1.996
1.995
3.3V
5V
5V
5V
4A
1A
5V
0
0
0
0
-10
0
MAX8732/MAX8734 (TON = V
DELAYED START WAVEFORMS
LOAD TRANSIENT RESPONSE
10 20
REFERENCE VOLTAGE
vs. OUTPUT CURRENT
5V PWM-MODE
30 40 50 60 70 80 90 100
(ON3 = REF)
200µs/div
I
20µs/div
REF
(µA)
CC
, SHDN = V+,
MAX8732/3/4 toc24
MAX8732/3/4 toc27
CC
)
OUT3
2V/div
OUT5
2V/div
ON3
2V/div
V
AC-
COUPLED
100mV/div
INDUCTOR
CURRENT
2A/div
DL5
5V/div
OUT
,