Rainbow Electronics MAX1545 - Manual (Page 10)

Typical Operating Characteristics (continued)
(Circuit of Figure 1, V IN = 12V, V CC = V DD = 5V, SHDN = SKIP = V CC , D0–D4 set for 1.5V (SUS = GND), S0–S1 set
for 1V (SUS = V CC ), OFS = GND, T A = +25°C, unless otherwise specified.)
MAX1519/MAX1545
Dual-Phase, Quick-PWM Controllers for
Programmable CPU Core Power Supplies
10 ______________________________________________________________________________________
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE (PULSE SKIPPING)
MAX1519 toc10
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
20 25 5 15 10
0.5
1.0
1.5
2.0
2.5
3.0
0
0 30
I IN
SKIP = REF
I CC + I DD
OUTPUT OFFSET VOLTAGE
vs. OFS VOLTAGE
MAX1519 toc11
OFS VOLTAGE (V)
OUTPUT OFFSET VOLTAGE (mV)
1.5 0.5 1.0
-100
-50
0
50
100
150
-150
0 2.0
UNDEFINED
REGION
REFERENCE VOLTAGE
DISTRIBUTION
MAX1519 toc12
REFERENCE VOLTAGE (V)
SAMPLE PERCENTAGE (%)
2.005 1.995 2.000
10
20
30
40
50
0
1.990 2.010
SAMPLE SIZE = 100
CURRENT-BALANCE OFFSET
VOLTAGE DISTRIBUTION
MAX1519 toc13
OFFSET VOLTAGE (mV)
SAMPLE PERCENTAGE (%)
1.25 -1.25 0
10
20
30
40
50
0
-2.50 2.50
SAMPLE SIZE = 100
CURRENT-LIMIT THRESHOLD
DISTRIBUTION
MAX1519 toc14
CURRENT LIMIT (mV)
SAMPLE PERCENTAGE (%)
10.5 9.5 10.0
10
20
30
40
50
0
9.0 11.0
V
ILIM
= 0.20V
SAMPLE SIZE = 100
60
-40
0.1 10 100 1000 1 10,000
VOLTAGE-POSITIONING AMPLIFIER
GAIN AND PHASE vs. FREQUENCY
-20
-10
0
-30
MAX1519 toc15
FREQUENCY (kHz)
GAIN (dB)
PHASE (DEGREES)
10
20
30
40
50
180
-180
-108
-72
-36
-144
0
36
72
108
144
GAIN
PHASE
VPS AMPLIFIER OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
MAX1519 toc16
COMMON-MODE VOLTAGE (V)
3 4 1 2 0 5
OFFSET VOLTAGE (
µ
V)
20
40
60
80
100
120
140
160
180
0
VPS AMPLIFIER
DISABLED
INDUCTOR CURRENT DIFFERENCE
vs. LOAD CURRENT
MAX1519 toc17
LOAD CURRENT (A)
30 40 10 20 0 50
I L(CS)
- I
L(CM)
(A)
0.2
0.4
0.6
0.8
1.0
0
R SENSE = 1m Ω
SKIP = V CC
SKIP = REF