MAX1845 Maxim, MAX1845 Datasheet - Page 4

• Manufacturer Part Number: MAX1845
• Description: Dual / High-Efficiency / Step-Down Controller with Accurate Current Limit
• Manufacturer: Maxim

ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
noted.)
Dual, High-Efficiency, Step-Down
Controller with Accurate Current Limit
4
Current-Limit Threshold (Fixed)
Current-Limit Threshold
(Adjustable)
ILIM_ Adjustment Range
Negative Current-Limit Threshold
(Fixed)
Thermal Shutdown Threshold
V
Threshold
DH_ Gate Driver Source/Sink
Current
DL_ Gate Driver Sink Current
DL_ Gate Driver Source Current
Logic Input High Voltage
Logic Input Low Voltage
TON Input Logic level
Logic Input Current
Logic Input Current
PGOOD Trip Threshold (Lower)
PGOOD Trip Threshold (Upper)
PGOOD Propagation Delay
PGOOD Output Low Voltage
PGOOD Leakage Current
DH Gate-Driver On-Resistance
(Note 4)
DL Gate-Driver On-Resistance
(Note 4)
DL Gate-Driver On-Resistance
(Note 4)
CC
_______________________________________________________________________________________
Undervoltage Lockout
PARAMETER
DD
= V
CC
= 5V, SKIP = AGND, V+ = 15V, T
SYMBOL
V
ILIM
V
V
IH
IL
_
AGND - V
AGND - V
AGND - V
V
Hysteresis = 15
Rising edge, hysteresis = 20mV, PWMs
disabled below this level
V
V
V
ON_, SKIP
UVP
ON_, SKIP
UVP
V
Float level
REF level
AGND level
TON (AGND or V
ON_, SKIP, UVP
With respect to error-comparator trip
threshold, falling edge
With respect to error-comparator trip
threshold, rising edge
Falling edge, FB_ forced 2% below PGOOD
trip threshold
I
High state, forced to 5.5V
BST - LX forced to 5V
DL, high state
DL, low state
SINK
CS
DH
DL
DL
CC
_ - AGND, ILIM_ = V
_ = 2.5V
_ = 2.5V
_ = 2.5V, V
level
= 1mA
CS
CS
CS
_, ILIM_ = V
_, ILIM_ = 0.5V
_, ILIM_ = 1V
BST
o
CONDITIONS
C
CC
_ = V
A
)
= 0°C to +85°C, typical values are at +25°C, unless otherwise
LX
CC
CC
MAX1845EEI
MAX1845ETX
MAX1845EEI
MAX1845ETX
MAX1845EEI
MAX1845ETX
_ = 5V
, T
A
= +25
o
C
V
V
-12.5
+7.5
MIN
4.05
3.15
1.65
0.3
-75
2.4
0.4
0.4
CC
CC
40
40
85
-3
-1
-
-
TYP
+10
100
160
-60
1.5
1.5
1.5
1.5
0.5
0.5
-10
1.5
50
50
1
3
1
+12.5
MAX
0.05
3.85
2.35
115
-7.5
-45
1.7
2.7
2.5
4.4
0.8
0.5
0.4
60
60
5
6
5
6
3
1
1
UNITS
mV
mV
mV
µA
µA
µA
o
µs
%
%
Ω
Ω
Ω
Ω
Ω
Ω
V
V
A
A
A
V
V
V
V
C