Datasheet

MAX1714
High-Speed Step-Down Controller
for Notebook Computers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, 4A components from Table 1, V+ = +15V, V
CC
= V
DD
= +5V, SKIP = AGND, T
A
= 0°C to +85°C, unless otherwise
noted.) (Note 1)
CONDITIONS UNITSMIN TYP MAXPARAMETER
PGND - LX
PGND - LX, I
LIM
= V
CC
From SHDN signal going high
mV
40 50 60
Current-Limit Threshold
(Positive Direction, Adjustable)
mV90 100 110
Current-Limit Threshold
(Positive Direction, Fixed)
ms10 30
Output Undervoltage Protection
Blanking Time
%65 70 75
Output Undervoltage Protection
Threshold
PGND - LX, SKIP = V
CC
, T
A
= +25°C,
with respect to positive current-limit threshold
%-90 -120 -140
Current-Limit Threshold
(Negative Direction)
V
ILIM
= 0.5V
V
ILIM
= 2.0V 170 200 230
Rising edge, hysteresis = 20mV,
PWM disabled below this level
V4.1 4.4
V
CC
Undervoltage Lockout
Threshold
BST - LX forced to 5V Ω1.5 5DH Gate-Driver On-Resistance
DL, high state Ω1.5 5
DL Gate-Driver On-Resistance
(Pull-Up)
DL, low state Ω0.5 1.7
DL Gate-Driver On-Resistance
(Pull-Down)
DH forced to 2.5V, BST - LX forced to 5V A1
DH Gate-Driver Source/Sink
Current
DL forced to 2.5V A1DL Gate-Driver Source Current
DL forced to 2.5V A3DL Gate-Driver Sink Current
FB forced 2% above trip threshold (MAX1714A only) µs1.5
Overvoltage Fault Propagation
Delay
%10.5 12.5 14.5Overvoltage Trip Threshold
FB forced 2% below PGOOD trip threshold, falling edge µs1.5PGOOD Propagation Delay
PGND - LX, SKIP = AGND
mV3
Current-Limit Threshold
(Zero Crossing)
I
SINK
= 1mA V0.4PGOOD Output Low Voltage
High state, forced to 5.5V µA1PGOOD Leakage Current
Hysteresis = 10°C °C150Thermal Shutdown Threshold
With respect to error comparator threshold (MAX1714A only)
With respect to error comparator threshold
DL rising
ns
35
Dead Time
DH rising 26
mA
SKIP Input Current Logic
Threshold
To disable overvoltage and undervoltage fault detection,
T
A
= +25°C
-1.5 -0.1
%PGOOD Trip Threshold
Measured at FB with respect to error comparator
threshold, falling edge
-8 -6 -4
VLogic Input High Voltage
SHDN, SKIP
2.4
VLogic Input Low Voltage
SHDN, SKIP
0.8
µALogic Input Current
SHDN, SKIP
-1 1
nAILIM Input Current
SHDN, SKIP
±
10