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
=
0°C to +85°C,
unless otherwise
noted.) (Note 1)
PARAMETER
Overvoltage Trip Threshold
Overvoltage Fault Propagation
Delay
Output Undervoltage Protection
Threshold
Output Undervoltage Protection
Blanking Time
Current-Limit Threshold
(Positive Direction, Fixed)
Current-Limit Threshold
(Positive Direction, Adjustable)
Current-Limit Threshold
(Negative Direction)
Current-Limit Threshold
(Zero Crossing)
PGOOD Propagation Delay
PGOOD Output Low Voltage
PGOOD Leakage Current
Thermal Shutdown Threshold
V
CC
Undervoltage Lockout
Threshold
DH Gate-Driver On-Resistance
DL Gate-Driver On-Resistance
(Pull-Up)
DL Gate-Driver On-Resistance
(Pull-Down)
DH Gate-Driver Source/Sink
Current
DL Gate-Driver Source Current
DL Gate-Driver Sink Current
Dead Time
SKIP
Input Current Logic
Threshold
PGOOD Trip Threshold
Logic Input High Voltage
Logic Input Low Voltage
Logic Input Current
ILIM Input Current
CONDITIONS
With respect to error comparator threshold (MAX1714A only)
FB forced 2% above trip threshold (MAX1714A only)
With respect to error comparator threshold
From
SHDN
signal going high
PGND - LX, I
LIM
= V
CC
PGND - LX
V
ILIM
= 0.5V
V
ILIM
= 2.0V
65
10
90
40
170
-90
100
50
200
-120
3
1.5
0.4
1
150
4.1
1.5
1.5
0.5
1
1
3
35
26
-1.5
-8
2.4
0.8
-1
±10
1
-6
-0.1
-4
4.4
5
5
1.7
MIN
10.5
TYP
12.5
1.5
70
75
30
110
60
230
-140
MAX
14.5
UNITS
%
µs
%
ms
mV
mV
%
mV
µs
V
µA
°C
V
Ω
Ω
Ω
A
A
A
ns
mA
%
V
V
µA
nA
3
MAX1714
PGND - LX,
SKIP
= V
CC
, T
A
= +25°C,
with respect to positive current-limit threshold
PGND - LX,
SKIP
= AGND
FB forced 2% below PGOOD trip threshold, falling edge
I
SINK
= 1mA
High state, forced to 5.5V
Hysteresis = 10°C
Rising edge, hysteresis = 20mV,
PWM disabled below this level
BST - LX forced to 5V
DL, high state
DL, low state
DH forced to 2.5V, BST - LX forced to 5V
DL forced to 2.5V
DL forced to 2.5V
DL rising
DH rising
To disable overvoltage and undervoltage fault detection,
T
A
= +25°C
Measured at FB with respect to error comparator
threshold, falling edge
SHDN, SKIP
SHDN, SKIP
SHDN, SKIP
SHDN, SKIP
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
