High-Speed Step-Down Controller
for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, 4A components from Table 1, V+ = +15V, V
CC
= V
DD
= +5V,
SKIP
= AGND,
T
A
= -40°C to +85°C,
unless other-
wise noted.) (Notes 1, 5)
PARAMETER
PGOOD Trip Threshold
PGOOD Output Low Voltage
PGOOD Leakage Current
CONDITIONS
Measured at FB with respect to error comparator
threshold, falling edge
I
SINK
= 1mA
High state, forced to 5.5V
MIN
-8
TYP
MAX
-4
0.4
1
UNIT
%
V
µA
MAX1714
Note 1:
For the MAX1714B, AGND and PGND refer to a single pin designated GND.
Note 2:
SKIP
may be forced below -0.3V, temporarily exceeding the absolute maximum rating, disabling over/undervoltage fault
detection for the purpose of debugging prototypes (Figure 6). Limit the current drawn to 5mA maximum.
Note 3:
When the inductor is in continuous conduction, the output voltage will have a DC regulation level higher than the error-
comparator threshold by 50% of the ripple. In discontinuous conduction (SKIP = AGND, light-loaded), the output voltage
will have a DC regulation level higher than the trip level by approximately 1.5% due to slope compensation.
Note 4:
On-time and off-time specifications are measured from 50% point to 50% point at the DH pin with LX = PGND, V
BST
= 5V,
and a 250pF capacitor connected from DH to LX. Actual in-circuit times may differ due to MOSFET switching speeds.
Note 5:
Specifications to -40°C are guaranteed by design, not production tested.
__________________________________________Typical Operating Characteristics
(Circuit of Figure 1, components from Table 1, V
IN
= +15V,
SKIP
= AGND, TON = unconnected, T
A
= +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(1.5A COMPONENTS, V
OUT
= 2.5V,
TON = GND, 600kHz)
V
IN
= 5V
MAX1714B-03
EFFICIENCY vs. LOAD CURRENT
(4A COMPONENTS, V
OUT
= 2.5V, 300kHz)
MAX1714B-01
EFFICIENCY vs. LOAD CURRENT
(8A COMPONENTS, V
OUT
= 1.6V, 300kHz)
V
IN
= 7V
90
EFFICIENCY (%)
EFFICIENCY (%)
10
MAX1714B-02
100
V
IN
= 7V
90
EFFICIENCY (%)
100
100
90
80
V
IN
= 20V
V
IN
= 12V
80
V
IN
= 12V
V
IN
= 20V
80
70
70
70
60
0.01
0.1
1
10
LOAD CURRENT (A)
60
0.01
0.1
1
LOAD CURRENT (A)
60
0.01
0.1
1
10
LOAD CURRENT (A)
_______________________________________________________________________________________
5
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
