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MAX1545数据手册封面

MAX1545 Datasheet

  • MAX1545

  • dual-phase, Quick-PWM™, step-down controllers

  • 813.95KB

  • Maxim   Maxim

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Dual-Phase, Quick-PWM Controllers for
Programmable CPU Core Power Supplies
MAX1519/MAX1545
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= 12V, V
CC
= V
DD
= 5V,
SHDN
=
SKIP
= V
CC
, D0鈥揇4 set for 1.5V (SUS = GND), S0鈥揝1 set
for 1V (SUS = V
CC
), OFS = GND, T
A
= +25掳C, unless otherwise specified.)
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE (PULSE SKIPPING)
MAX1519 toc10
OUTPUT OFFSET VOLTAGE
vs. OFS VOLTAGE
MAX1519 toc11
REFERENCE VOLTAGE
DISTRIBUTION
SAMPLE SIZE = 100
SAMPLE PERCENTAGE (%)
40
MAX1519 toc12
3.0
SKIP = REF
2.5
SUPPLY CURRENT (mA)
2.0
1.5
1.0
0.5
I
IN
0
0
5
10
15
20
25
I
CC
+ I
DD
150
OUTPUT OFFSET VOLTAGE (mV)
100
50
0
-50
-100
-150
UNDEFINED
REGION
0
0.5
1.0
OFS VOLTAGE (V)
1.5
50
30
20
10
30
2.0
0
1.990
1.995
INPUT VOLTAGE (V)
2.005
2.000
REFERENCE VOLTAGE (V)
2.010
CURRENT-BALANCE OFFSET
VOLTAGE DISTRIBUTION
MAX1519 toc13
CURRENT-LIMIT THRESHOLD
DISTRIBUTION
V
ILIM
= 0.20V
SAMPLE SIZE = 100
SAMPLE PERCENTAGE (%)
40
MAX1519 toc14
VOLTAGE-POSITIONING AMPLIFIER
GAIN AND PHASE vs. FREQUENCY
60
50
40
30
GAIN (dB)
GAIN
MAX1519 toc15
50
SAMPLE SIZE = 100
SAMPLE PERCENTAGE (%)
40
50
180
144
108
PHASE (DEGREES)
72
36
0
-36
-72
30
30
20
10
0
-10
20
20
10
10
-20
-30
PHASE
-108
-144
0
-2.50
-1.25
0
1.25
2.50
OFFSET VOLTAGE (mV)
0
9.0
9.5
10.0
10.5
11.0
CURRENT LIMIT (mV)
-40
0.1
1
10
100
1000
-180
10,000
FREQUENCY (kHz)
VPS AMPLIFIER OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
160
OFFSET VOLTAGE (碌V)
140
120
100
80
60
40
20
0
0
1
2
3
4
5
COMMON-MODE VOLTAGE (V)
VPS AMPLIFIER
DISABLED
0.2
MAX1519 toc16
INDUCTOR CURRENT DIFFERENCE
vs. LOAD CURRENT
MAX1519 toc17
180
1.0
0.8
I
L(CS)
- I
L(CM)
(A)
SKIP = REF
0.6
0.4
SKIP = V
CC
R
SENSE
= 1m鈩?/div>
0
0
10
20
30
40
50
LOAD CURRENT (A)
10
______________________________________________________________________________________

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