Electrical characteristics (continued) – Rainbow Electronics MAX1791 User Manual
Page 3
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
4
V
SHDN Logic Input Current
SHDN = 0 or 5V
-2
2
µA