MAX1845 Maxim, MAX1845 Datasheet - Page 5

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

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