MAX1537ETX-T Maxim Integrated, MAX1537ETX-T Datasheet - Page 10

• Manufacturer Part Number: MAX1537ETX-T
• Description: Current & Power Monitors & Regulators
• Manufacturer: Maxim Integrated

High-Efficiency, 5x Output, Main Power-Supply
Controllers for Notebook Computers
(MAX1537 circuit of Figure 1, V
10
12.1
12.0
11.9
11.8
11.7
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
______________________________________________________________________________________
0
0
AUXILIARY LINEAR-REGULATOR
5
40
LDOA LOAD CURRENT (mA)
IDLE-MODE CURRENT
vs. INPUT VOLTAGE
LOAD REGULATION
INPUT VOLTAGE (V)
10
DUTY CYCLE
LIMITED
80
15
120
20
IN
5V OUTPUT
160
= 12V, LDO5 = V
25
200
30
2.02
2.01
2.00
1.99
1.98
3.3V
12V
12V
Typical Operating Characteristics (continued)
5V
0
0
0
0
CC
-20
A. LX5, 10V/div
B. 5V OUTPUT, 100mV/div
C. PWM5 INDUCTOR CURRENT, 5A/div
D. LX3, 10V/div
E. 3.3V OUTPUT, 100mV/div
F. PWM3 INDUCTOR CURRENT, 5A/div
2.0V REFERENCE LOAD REGULATION
= 5V, SKIP = GND, FSEL = REF, T
0
INTERLEAVED OPERATION
REF LOAD CURRENT (µA)
20
2.0µs/div
40
60
MAX1533/37 toc14
80
100
A
B
C
D
E
F
A
= +25°C, unless otherwise noted.)
-100
-150
-200
-50
50
5V
4V
2V
2V
2V
0
0
0
0
0
0
A. SHDN, 5V/div
B. LDO5, 2V/div
C. LDO3, 2V/div
D. REF, 2V/div
100Ω LOAD ON LDO5 AND LDO3
20
STARTUP WAVEFORMS
LDO LOAD CURRENT (mA)
LINEAR-REGULATOR
LINEAR-REGULATOR
LOAD REGULATION
40
LDO5
60
400µs/div
LDO3
80
ON3 = ON5 = GND
100
MAX1533/37 toc15
V
120
IN
= 6V
140
A
B
C
D