Rainbow-electronics MAX1845 Bedienungsanleitung Seite 5

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MAX1845
Dual, High-Efficiency, Step-Down
Controller with Accurate Current Limit
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
DD
= V
CC
= 5V, SKIP = GND, V+ = 15V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
PWM CONTROLLERS
V+ Battery voltage, V+ 2 28
Input Voltage Range
V
CC
/V
DD
V
CC
, V
DD
4.5 5.5
V
FB1 to GND
1.773 1.827
FB1 to V
CC
1.477 1.523
D C O utp ut V ol tag e, O U T1 ( N ote 2)
V
OUT1
V+ = 2V to 28V, SKIP = V
CC
,
I
LOAD
= 0 to 10A
FB1 to OUT1 0.985 1.015
V
FB2 to GND
2.463 2.537
D C O utp ut V ol tag e, O U T2 ( N ote 2)
V
OUT2
V+ = 2V to 28V, SKIP = V
CC
,
I
LOAD
= 0 to 10A
FB2 to OUT2 0.985 1.015
V
Output Voltage Adjust Range OUT1, OUT2 1 5.5 V
Dual-Mode Threshold (Low) OVP, FB_
0.05 0.15
V
OVP, ILIM_
V
CC
-
1.5
V
CC
-
0.4
Dual-Mode Threshold (High)
FB_ 1.9 2.1
V
R
OUT1
V
OUT1
= 1.5V 75
OUT_ Input Resistance
R
OUT2
V
OUT2
= 2.5V
100
k
FB_ Input Bias Current I
FB
-0.1
0.1 µA
TON = GND
120
153
TON = REF
153
195
TON = float
217
272
On-Time, Side 1 (Note 3) t
ON1
V+ = 24V, V
OUT1
= 2V
TON = V
CC
308
390
ns
TON = GND
160
204
TON = REF
205
263
TON = float
295
371
On-Time, Side 2 (Note 3) t
ON2
V+ = 24V, V
OUT2
= 2V
TON = V
CC
422
534
ns
TON = GND
125
145
TON = REF
125
145
TON = float
125
145
On-Time Tracking (Note 3)
On-time 2, with
respect to on-time 1
TON = V
CC
125
145
%
Minimum Off-Time (Note 3) t
OFF
500 ns
Quiescent Supply Current (V
CC
)I
CC
FB forced above the regulation point
1500
µA
Quiescent Supply Current (V
DD
)I
DD
FB forced above the regulation point 5 µA
Quiescent Supply Current (V+) I+ Measured at V+ 70 µA
Reference Voltage V
REF
V
CC
= 4.5V to 5.5V, no external REF load
1.98 2.02
V
Reference Load Regulation I
REF
= 0 to 50uA
0.01
V
Overvoltage Trip Threshold
(Fixed-Threshold Mode)
OVP = GND, with respect to FB_ regulation
point, no load
112
117 %
Output Undervoltage Threshold
UVP = V
CC
, with respect to FB_ regulation
point, no load
65 75 %
Current-Limit Threshold (Fixed) GND - V
CS
, ILIM_ = V
CC
35 65 mV
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