High-Speed Step-Down Controller
for Notebook Computers
_____________________________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.)
LOAD-TRANSIENT RESPONSE
(4A COMPONENTS, V
OUT
= 2.5V, 300kHz)
MAX1714B-13
MAX1714
LOAD-TRANSIENT RESPONSE
(8A COMPONENTS, V
OUT
= 1.6V, 300kHz)
MAX1714B-14
LOAD-TRANSIENT RESPONSE
(1.5A COMPONENTS, V
IN
= 5V,
V
OUT
= 2.5V, 600kHz)
A
MAX1714B-15
A
A
B
B
B
C
C
10µs/div
A = V
OUT
, AC-COUPLED, 100mV/div
B = INDUCTOR CURRENT, 2A/div
C = DL, 10V/div
10µs/div
A = V
OUT
, AC-COUPLED, 100mV/div
B = INDUCTOR CURRENT, 5A/div
C = DL, 5V/div
C
5µs/div
A = V
OUT
, AC-COUPLED, 100mV/div
B = INDUCTOR CURRENT, 1A/div
C = DL, 5V/div
START-UP WAVEFORM
(4A COMPONENTS, I
OUT
= 4A, ACTIVE LOAD,
V
OUT
= 2.5V, 300kHz)
MAX1714B-16
OUTPUT OVERLOAD WAVEFORM
(4A COMPONENTS, V
OUT
= 2.5V, 300kHz)
MAX1714B-17
SHUTDOWN WAVEFORM
(4A COMPONENTS, V
OUT
= 2.5V, 300kHz)
MAX1714B-18
A
OUTPUT
UNDERVOLTAGE
PROTECTION
THRESHOLD
A
B
A
B
B
C
C
C
500µs/div
A = V
OUT
, 1V/div
B = INDUCTOR CURRENT, 5A/div
C = DL, 5V/div
200µs/div
A = V
OUT
, 1V/div
B = INDUCTOR CURRENT, 5A/div
C = DL, 5V/div
50µs/div
A = V
OUT
, 1V/div
B = INDUCTOR CURRENT, 5A/div
C = DL, 5V/div
_______________________________________________________________________________________
7
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
