Ultra-High Efficiency, Dual Step-Down
Controller for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, 4A components from Table 1, V
CC =
V
DD
= +5V,
SKIP
= AGND, V+ = 15V,
T
A
= -40°C to +85°C,
unless otherwise
noted.) (Note 1)
PARAMETER
Quiescent Battery Current (V+)
Quiescent Supply Current
(V
CC
+ V
DD
)
Reference Voltage
Reference Load Regulation
Overvoltage Trip Threshold
Output Undervoltage Threshold
FB1 and FB2 forced above the regulation point
No external REF load
I
REF
= 0 to 50µA
With respect to error comparator threshold
With respect to error comparator threshold
10
60
75
32
160
12.5
70
100
50
200
150
4.1
2.4
0.8
-5
-1
4.4
1.97
CONDITIONS
MIN
TYP
25
1100
2
MAX
70
1600
2.03
0.01
15
80
125
62
mV
240
°C
V
V
V
mA
UNITS
µA
µA
V
V
%
%
mV
MAX1715
Current-Limit Threshold (positive
PGND - LX_, I
LIM
= V
CC
direction, fixed)
Current-Limit Threshold (positive PGND - LX_, I
LIM
resistor = 100kΩ
direction, adjusted)
PGND - LX_, I
LIM
resistor = 400kΩ
Thermal Shutdown Threshold
V
CC
Undervoltage Lockout
Threshold
Logic Input High Voltage
Logic Input Low Voltage
Logic Input Current
Hysteresis = 10°C
Rising edge, hysteresis = 20mV, PWM disabled below
this level
ON_,
SKIP
ON_,
SKIP
SKIP,
to deactivate OVP circuitry
Note 1:
Specifications to -40°C are guaranteed by design, and not production tested.
Note 2:
When the inductor is in continuous conduction, the output voltage will have a DC regulation higher than the trip level by
50% of the ripple. In discontinuous conduction (SKIP = AGND, light load) the output voltage will have DC regulation
higher than the trip level by approximately 1.5% due to slope compensation.
Note 3:
On-time and off-time specifications are measured from the 50% point at the DH pin with LX = PGND, V
BST
= 5V. Actual
in-circuit times may differ due to MOSFET switching speeds.
__________________________________________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
(1.8V, 4A COMPONENTS, SKIP = GND)
MAX1715-01
EFFICIENCY vs. LOAD CURRENT
(1.8V, 4A COMPONENTS, SKIP = V
CC
)
MAX1715-02
EFFICIENCY vs. LOAD CURRENT
(2.5V, 4A COMPONENTS, SKIP = GND)
V+ = +7V
90
EFFICIENCY (%)
MAX1715-03
100
V+ = +7V
90
EFFICIENCY (%)
100
100
80
V+ = +7V
EFFICIENCY (%)
60
V+ = +12V
V+ = +12V
80
V+ = +20V
80
V+ = +20V
70
V+ = +12V
40
V+ = +20V
20
70
60
0.01
0.1
1
10
LOAD CURRENT (A)
0
0.01
0.1
1
10
LOAD CURRENT (A)
60
0.01
0.1
1
10
LOAD CURRENT (A)
_______________________________________________________________________________________
5
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
