Typical operating characteristics, Electrical characteristics (continued) – Rainbow Electronics MAX1718 User Manual
Page 6
MAX1718
Notebook CPU Step-Down Controller for Intel
Mobile Voltage Positioning (IMVP-II)
6
_______________________________________________________________________________________
Typical Operating Characteristics
(Circuit of Figure 1, V+ = 12V, V
DD
= V
CC
= SKP/SDN = 5V, V
OUT
= 1.25V, T
A
= +25°C, unless otherwise noted.)
95
50-
0.01
0.1
1
10
100
EFFICIENCY vs. LOAD CURRENT
300kHz VOLTAGE POSITIONED
MAX1718 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
65
75
85
80
70
60
55
90
SKIP MODE
V+ = 7V
SKIP MODE
V+ = 20V
PWM MODE
V+ = 12V
PWM MODE
V+ = 20V
SKIP MODE
V+ = 12V
PWM MODE
V+ = 7V
400
300
200
100
0
0
10
5
15
20
FREQUENCY vs. LOAD CURRENT
MAX1718 toc02
LOAD CURRENT (A)
FREQUENCY (kHz)
PWM MODE
SKIP MODE
250
280
270
260
290
300
310
320
330
340
350
7.0
13.8
10.4
17.2
20.6
24.0
FREQUENCY vs. INPUT VOLTAGE
MAX1718 toc03
INPUT VOLTAGE (V)
FREQUENCY (kHz)
I
OUT
= 18A
I
OUT
= 3A
323.0
324.0
323.5
325.0
324.5
325.5
326.0
-40
10
-15
35
60
85
FREQUENCY vs. TEMPERATURE
MAX1718 toc04
TEMPERATURE (
°C)
FREQUENCY (kHz)
I
OUT
= 19A
20
30
25
40
35
45
50
-40
10
-15
35
60
85
OUTPUT CURRENT AT CURRENT LIMIT
vs. TEMPERATURE
MAX1718 toc05
TEMPERATURE (
°C)
CURRENT (A)
0
300
200
100
400
500
600
700
800
900
1000
5
10
15
20
25
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1718\ toc06
INPUT VOLTAGE (V)
SUPPLY CURRENT (
µ
A)
I
CC
+ I
DD
I+
Note 1: On-Time specifications are measured from 50% to 50% at the DH pin, with LX forced to 0V, BST forced to 5V, and a 500pF
capacitor from DH to LX to simulate external MOSFET gate capacitance. Actual in-circuit times may be different due to
MOSFET switching speeds.
Note 2: Specifications to T
A
= -40°C are guaranteed by design and not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, V
CC
= V
DD
= SKP/SDN = 5V, V
OUT
= 1.25V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
D0–D4, 0 to 0.4V or 2.6V to 5.5V applied through resistor,
ZMODE = V
CC
k
Ω
95
DAC B-Mode Programming
Resistor, High
D0–D4, ZMODE, SUS, OVP
V
0.8
Logic Input Low Voltage
CONDITIONS
UNITS
MIN
TYP
MAX
PARAMETER
D0–D4, 0 to 0.4V or 2.6V to 5.5V applied through resistor,
ZMODE = V
CC
k
Ω
1.05
DAC B-Mode Programming
Resistor, Low
D0–D4, ZMODE, SUS, OVP
V
2.4
Logic Input High Voltage
LOGIC AND I/O