Datasheet

MAX1762/MAX1791
High-Efficiency, 10-Pin µMAX, Step-Down
Controllers for Notebooks
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
VP
= 15V, VL enabled, C
VL
= 1µF, C
REF
= 0.1µF,
T
A
= 0 to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Reference Voltage V
VL
= 4.75V to 5.25V, no load
1.98
2
2.02
V
Reference Load Regulation I
REF
= 0 to 50µA
0.01
V
REF Sink Current REF in regulation 10 µA
REF Fault Lockout Voltage Falling edge 1.6 V
Output Undervoltage Threshold
(Foldback)
With respect to regulation point, no load 60 70 80 %
Output Undervoltage Lockout
Time (Foldback)
From SHDN signal going high V
OUT
< 0.6 x
regulation point
10 20 42 ms
Current-Limit Threshold V
ILIM
-90
-100 -110
mV
Thermal Shutdown Threshold Hysteresis = 10
o
C
160
o
C
VL Undervoltage Lockout
Threshold
Rising edge, hysteresis = 20mV, PWM
disabled below this level
4.1 4.4 V
DH Gate Driver On-Resistance V
VP
= 6V to 20V, measure at 50mA 5 8 Ω
DL Gate Driver On-Resistance
(Pullup)
DL, high state, measure at 50mA 5 8 Ω
DL Gate Driver On-Resistance
(Pulldown)
DL, low state, measure at 50mA 1 5 Ω
DH Gate Driver Source/Sink
Current
V
DH
= 3V, V
VP
= 6V 0.6 A
DL Gate Driver Sink Current V
DL
= 2.5V 0.9 A
DL Gate Driver Source Current V
DL
= 2.5V 0.5 A
SHDN Logic Input High
Threshold Voltage
V
IH
1.6 V
SHDN Logic Input Low
Threshold Voltage
V
IL
0.6 V
MAX1762 V
OUT
= 1.8V fixed
MAX1791 V
OUT
= 3.3V fixed
50
100 150
mV
MAX1762 V
OUT
= 2.5V fixed
Dual Mode Threshold Voltage
MAX1791 V
OUT
= 5V fixed
2.5
3.25
4V
SHDN Logic Input Current SHDN = 0 or 5V -2 +2 µA