MAX1845 Maxim, MAX1845 Datasheet - Page 2

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

ABSOLUTE MAXIMUM RATINGS (Note 1)
V+ to AGND..............................................................-0.3 to +30V
V
V
AGND to PGND .....................................................-0.3V to +0.3V
PGOOD, OUT_ to AGND..........................................-0.3V to +6V
OVP, UVP, ILIM_, FB_, REF,
DL_ to PGND ..............................................-0.3V to (V
BST_ to AGND........................................................-0.3V to +36V
CS_ to AGND.............................................................-6V to +30V
DH1 to LX1 ..............................................-0.3V to (V
Dual, High-Efficiency, Step-Down
Controller with Accurate Current Limit
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
noted.)
2
Note 1: For the MAX1845EEI, AGND and PGND refer to a single pin designated GND.
PWM CONTROLLERS
Input Voltage Range
DC Output Voltage OUT1
(Note 2)
DC Output Voltage OUT2
(Note 2)
Output Voltage Adjust Range
Dual-Mode Threshold, Low
Dual-Mode Threshold, High
OUT_ Input Resistance
FB_ Input Bias Current
Soft-Start Ramp Time
CC
DD
SKIP, TON, ON_ to AGND......................-0.3V to (V
_______________________________________________________________________________________
to AGND............................................................-0.3V to +6V
to PGND............................................................-0.3V to +6V
PARAMETER
DD
= V
CC
= 5V, SKIP = AGND, V+ = 15V, T
SYMBOL
V
V
V
R
R
CC
OUT1
OUT2
OUT1
OUT2
V+
I
FB
/V
DD
Battery voltage, V+
V
V+ = 2V to 28V, I
= 0 to 8A, SKIP = V
+25°C to +85°C
V+ = 2V to 28V, I
= 0 to 8A, SKIP = V
0°C to +85°C
V+ = 4.5V to 28V,
I
SKIP = V
+25°C to +85°C
V+ = 4.5V to 28V,
I
SKIP = V
0°C to +85°C
OUT1, OUT2
OVP, FB_
OVP, ILIM_
FB1
V
V
Zero to full ILIM
LOAD
LOAD
CC
OUT1
OUT2
BST1
CC
DD
, V
= 0 to 4A,
= 0 to 4A,
DD
= 1.5V
= 2.5V
+ 0.3V)
+ 0.3V)
+ 0.3V)
CC
CC
,
,
CONDITIONS
LOAD
LOAD
A
CC
CC
LX_ to BST_ ..............................................................-6V to +0.3V
DH2 to LX2 ..............................................-0.3V to (V
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation (T
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
= 0°C to +85°C, typical values are at +25°C, unless otherwise
,
,
28-Pin QSOP (derate 10.8mW/°C above +70°C)........860mW
36-Pin 6mm
(derate 26.3mW/°C above +70°C) .............................2105mW
FB1 to AGND
FB1 to V
FB1 to OUT1
FB1 to AGND
FB1 to V
FB1 to OUT1
FB2 to AGND
FB2 to OUT2
FB2 to AGND
FB2 to OUT2
CC
CC
✕
6mm Thin QFN
1.782
1.485
1.773
1.477
0.985
2.475
2.463
0.985
V
MIN
0.99
0.99
0.05
-0.1
100
4.5
1.5
1.9
CC
75
2
1
A
-
= +70°C)
1700
TYP
1.8
1.5
1.8
1.5
2.5
2.5
0.1
2.0
1
1
1
1
1.818
1.515
1.827
1.523
1.015
2.525
2.537
1.015
V
MAX
1.01
1.01
0.15
5.5
5.5
0.4
2.1
0.1
28
CC
BST2
-
UNITS
+ 0.3V)
kΩ
µA
µs
V
V
V
V
V
V