High-Speed Step-Down Controller
for Notebook Computers
MAX1714
_____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 1, components from Table 1, V
IN
= +15V,
SKIP
= AGND, TON = unconnected, T
A
= +25°C, unless otherwise noted.)
FREQUENCY vs. LOAD CURRENT
(4A COMPONENTS, V
OUT
= 2.5V)
V
IN
= 7V, 15V, PWM MODE
300
FREQUENCY (kHz)
250
200
150
100
50
0
0.01
0.1
1
10
LOAD CURRENT (A)
280
0
5
10
15
20
25
30
INPUT VOLTAGE (V)
V
IN
= 7V
SKIP MODE
V
IN
= 15V
SKIP MODE
MAX1714B-04
FREQUENCY vs. INPUT VOLTAGE
(4A COMPONENTS, V
OUT
= 2.5V, I
OUT
= 1A)
MAX1714B-05
FREQUENCY vs. TEMPERATURE
(4A COMPONENTS, V
OUT
= 2.5V)
MAX1714B-06
350
320
330
325
FREQUENCY (kHz)
320
315
310
305
300
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
I
OUT
= 1A
I
OUT
= 4A
310
FREQUENCY (kHz)
300
290
I
OUT
AT CURRENT LIMIT vs.
TEMPERATURE
(4A COMPONENTS, V
OUT
= 2.5V)
MAX1714B-07
CONTINUOUS TO DISCONTINUOUS INDUCTOR
CURRENT POINT vs. INPUT VOLTAGE
(4A COMPONENTS, V
OUT
= 2.5V)
MAX1714B-08
INDUCTOR CURRENT PEAKS AND VALLEYS
vs. INPUT VOLTAGE (4A COMPONENTS,
AT CURRENT-LIMIT TRIP POINT)
8
INDUCTOR CURRENT (A)
7
6
5
4
3
2
I
VALLEY
MAX1714B-09
12
10
OUTPUT CURRENT (A)
8
6
4
2
0
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
V
ILIM
= 0.5V
V
ILIM
= 1V
700
600
LOAD CURRENT (mA)
500
400
300
200
100
0
0
5
10
15
20
25
9
I
PEAK
1
0
30
0
5
10
15
20
25
30
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
NO-LOAD SUPPLY CURRENT
(4A COMPONENTS, SKIP MODE, 300kHz)
MAX1714B-10
MAX1714B-11
I
CC
500
SUPPLY CURRENT (µA)
400
300
200
100
I
IN
0
SUPPLY CURRENT (µA)
SUPPLY CURRENT (mA)
600
I
CC
8
I
IN
6
I
DD
400
4
200
I
IN
0
0
5
10
15
20
25
30
INPUT VOLTAGE (V)
I
DD
2
I
CC
0
0
5
10
15
20
25
30
INPUT VOLTAGE (V)
I
DD
5.0
5.5
6.0
4.0
4.5
V
CC
, V
DD
, V
IN
INPUT VOLTAGE (V)
6
_______________________________________________________________________________________
MAX1714B-12
800
10
NO-LOAD SUPPLY CURRENT vs.
INPUT VOLTAGE
(4A COMPONENTS, PWM MODE, 300kHz)
600
NO-LOAD SUPPLY CURRENT vs. INPUT
VOLTAGE (1.5A COMPONENTS,
SKIP MODE, V
OUT
= 2.5V, 600kHz)
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
