Rainbow Electronics MAX1715 - Manual (Page 5)

MAX1715
Ultra-High Efficiency, Dual Step-Down
Controller for Notebook Computers
_______________________________________________________________________________________ 5
60
0.01 10 1 0.1
90
100
80
70
MAX1715-01
LOAD CURRENT (A)
EFFICIENCY (%)
EFFICIENCY vs. LOAD CURRENT
(1.8V, 4A COMPONENTS, SKIP = GND)
V+ = +7V
V+ = +12V
V+ = +20V
0
0.01 10 1 0.1
60
80
100
40
20
MAX1715-02
LOAD CURRENT (A)
EFFICIENCY (%)
EFFICIENCY vs. LOAD CURRENT
(1.8V, 4A COMPONENTS, SKIP = V
CC
)
V+ = +7V
V+ = +20V
V+ = +12V
60
0.01 10 1 0.1
90
100
80
70
MAX1715-03
LOAD CURRENT (A)
EFFICIENCY (%)
EFFICIENCY vs. LOAD CURRENT
(2.5V, 4A COMPONENTS, SKIP = GND)
V+ = +7V
V+ = +20V
V+ = +12V
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.)
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)
Quiescent Battery Current (V+) 25 70 µA
Reference Voltage 1.97 2 2.03 V No external REF load
Quiescent Supply Current
(V
CC + V DD )
1100 1600 µA FB1 and FB2 forced above the regulation point
PARAMETER MIN TYP MAX UNITS CONDITIONS
Reference Load Regulation 0.01 V I REF = 0 to 50µA
Overvoltage Trip Threshold 10 12.5 15 % With respect to error comparator threshold
Output Undervoltage Threshold 60 70 80 % With respect to error comparator threshold
Current-Limit Threshold (positive
direction, fixed)
75 100 125 mV PGND - LX_, I LIM = V CC
Current-Limit Threshold (positive
direction, adjusted)
32 50 62
mV
PGND - LX_, I LIM resistor = 100k Ω
PGND - LX_, I LIM resistor = 400k Ω 160 200 240
Thermal Shutdown Threshold 150 °C Hysteresis = 10°C
Rising edge, hysteresis = 20mV, PWM disabled below
this level
4.1 4.4 V
V CC Undervoltage Lockout
Threshold
Logic Input High Voltage 2.4 V ON_, SKIP
ON_, SKIP 0.8 V Logic Input Low Voltage
SKIP, to deactivate OVP circuitry -5 -1 mA Logic Input Current