MAX1845EEI Datasheet Download

Part No.:
MAX1845EEI
Download:
Download Datasheet
Description:
[Dual, High-Efficiency, Step-Down Controller with Accurate Current Limit]
File Size:
540 K
Page:
27 Pages
Logo:
Manufacturer:
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
PCB Prototype
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Dual, High-Efficiency, Step-Down
Controller with Accurate Current Limit
MAX1845
ABSOLUTE MAXIMUM RATINGS (Note 1)
V+ to AGND..............................................................-0.3 to +30V
V
CC
to AGND............................................................-0.3V to +6V
V
DD
to PGND............................................................-0.3V to +6V
AGND to PGND .....................................................-0.3V to +0.3V
PGOOD, OUT_ to AGND..........................................-0.3V to +6V
OVP, UVP, ILIM_, FB_, REF,
SKIP,
TON, ON_ to AGND......................-0.3V to (V
CC
+ 0.3V)
DL_ to PGND ..............................................-0.3V to (V
DD
+ 0.3V)
BST_ to AGND........................................................-0.3V to +36V
CS_ to AGND.............................................................-6V to +30V
DH1 to LX1 ..............................................-0.3V to (V
BST1
+ 0.3V)
LX_ to BST_ ..............................................................-6V to +0.3V
DH2 to LX2 ..............................................-0.3V to (V
BST2
+ 0.3V)
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
28-Pin QSOP (derate 10.8mW/°C above +70°C)........860mW
36-Pin 6mm
6mm Thin QFN
(derate 26.3mW/°C above +70°C) .............................2105mW
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
Note 1:
For the MAX1845EEI, AGND and PGND refer to a single pin designated GND.
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
DD
= V
CC
= 5V,
SKIP
= AGND, V+ = 15V,
T
A
= 0°C to +85°C,
typical values are at +25°C, unless otherwise
noted.)
PARAMETER
PWM CONTROLLERS
Input Voltage Range
V+
V
CC
/V
DD
Battery voltage, V+
V
CC
, V
DD
V+ = 2V to 28V, I
LOAD
= 0 to 8A,
SKIP
= V
CC
,
+25°C to +85°C
V
OUT1
V+ = 2V to 28V, I
LOAD
= 0 to 8A,
SKIP
= V
CC
,
0°C to +85°C
V+ = 4.5V to 28V,
I
LOAD
= 0 to 4A,
SKIP
= V
CC
,
+25°C to +85°C
V
OUT2
V+ = 4.5V to 28V,
I
LOAD
= 0 to 4A,
SKIP
= V
CC
,
0°C to +85°C
OUT1, OUT2
OVP, FB_
OVP, ILIM_
FB1
OUT_ Input Resistance
FB_ Input Bias Current
Soft-Start Ramp Time
R
OUT1
R
OUT2
I
FB
Zero to full ILIM
V
OUT1
= 1.5V
V
OUT2
= 2.5V
FB1 to AGND
FB1 to V
CC
FB1 to OUT1
FB1 to AGND
FB1 to V
CC
FB1 to OUT1
FB2 to AGND
FB2 to OUT2
FB2 to AGND
FB2 to OUT2
2
4.5
1.782
1.485
0.99
1.773
1.477
0.985
2.475
0.99
2.463
0.985
1
0.05
V
CC
-
1.5
1.9
75
100
-0.1
1700
0.1
2.0
0.1
1.8
1.5
1
1.8
1.5
1
2.5
1
2.5
1
28
5.5
1.818
1.515
1.01
1.827
1.523
1.015
2.525
1.01
V
2.537
1.015
5.5
0.15
V
CC
-
0.4
2.1
kΩ
µA
µs
V
V
V
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC Output Voltage OUT1
(Note 2)
DC Output Voltage OUT2
(Note 2)
Output Voltage Adjust Range
Dual-Mode Threshold, Low
Dual-Mode Threshold, High
2
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