Rainbow-electronics MAX1845 Manual do Utilizador Página 2
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MAX1845
Dual, High-Efficiency, Step-Down
Controller with Accurate Current Limit
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
V+ to GND ................................................................-0.3 to +30V
V
CC
, V
DD
to GND .....................................................-0.3V to +6V
PGOOD, OUT_ to GND ............................................-0.3V to +6V
OVP, UVP, ILIM_, FB_, REF,
SKIP, TON, ON_ to GND ........................-0.3V to (V
CC
+ 0.3V)
DL_ to GND ................................................-0.3V to (V
DD
+ 0.3V)
BST_ to GND ..........................................................-0.3V to +36V
CS_ to GND ...............................................................-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
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
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
DD
= V
CC
= 5V, SKIP = GND, V+ = 15V, T
A
= 0°C to +85°C, typical values are at +25°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
1.782
1.8
1.818
FB1 to V
CC
1.485
1.5
1.515
V+ = 2V to 28V, I
LOAD
= 0 to 8A, SKIP = V
CC
,
+25°C to +85°C
FB1 to OUT1
0.99
1
1.01
FB1 to GND
1.773
1.8
1.827
FB1 to V
CC
1.477
1.5
1.523
DC Output Voltage OUT1
(Note 2)
V
OUT1
V+ = 2V to 28V, I
LOAD
= 0 to 8A, SKIP = V
CC
,
0°C to +85°C
FB1 to OUT1
0.985
1
1.015
V
FB2 to GND
2.475
2.5
2.525
V+ = 4.5V to 28V,
I
LOAD
= 0 to 4A,
SKIP = V
CC
,
+25°C to +85°C
FB2 to OUT2
0.99
1
1.01
FB2 to GND
2.463
2.5
2.537
DC Output Voltage OUT2
(Note 2)
V
OUT2
V+ = 4.5V to 28V,
I
LOAD
= 0 to 4A,
SKIP = V
CC
,
0°C to +85°C
FB2 to OUT2
0.985
1
1.015
V
Output Voltage Adjust Range OUT1, OUT2 1 5.5 V
Dual-Mode Threshold, Low OVP, FB_
0.05
0.1
0.15
V
OVP, ILIM_
V
CC
-
1.5
V
CC
-
0.4
Dual-Mode Threshold, High
FB1 1.9 2.0 2.1
V
R
OUT1
V
OUT1
= 1.5V 75
OUT_ Input Resistance
R
OUT2
V
OUT2
= 2.5V 100
kΩ
FB_ Input Bias Current I
FB
-0.1
0.1 µA
Soft-Start Ramp Time Zero to full ILIM
1700
µs
TON = GND 120 137
153
TON = REF 153 174
195
TON = float 222 247
272
On-Time, Side 1 (Note 3) t
ON1
V+ = 24V,
V
OUT1
= 2V
TON = V
CC
316 353
390
ns
- General Description 1
- Applications 1
- Features 1
- Ordering Information 1
- Minimal Operating Circuit 1
- ABSOLUTE MAXIMUM RATINGS 2
- ELECTRICAL CHARACTERISTICS 2
- (Adjustable-Threshold Mode) 3
- FREQUENCY vs. LOAD CURRENT 6
- FREQUENCY vs. INPUT VOLTAGE 6
- (TON = FLOAT, SKIP = V 6
- MAX1845 toc07a 7
- MAX1845 toc09 8
- MAX1845 toc07b 8
- Pin Description (continued) 9
- 5V Bias Supply (V 10
- On-Time One-Shot (TON) 11
- Standard Applications 12
- Table 2. Component Suppliers 12
- Forced-PWM Mode ( 14
- Current-Limit Circuit (ILIM_) 15
- POR, UVLO, and Soft-Start 16
- Power-Good Output (PGOOD) 16
- Inductor Selection 17
- Transient Response 18
- Determining the Current Limit 18
- Output Capacitor Selection 18
- Output Capacitor Stability 19
- Considerations 19
- Input Capacitor Selection 20
- Power MOSFET Selection 20
- MOSFET Power Dissipation 20
- Dropout Performance 21
- Fixed Output Voltages 21
- Setting V 21
- _ with a Resistor-Divider 21
- Layout Procedure 23
- Pin Configuration 23
- Chip Information 23
- Package Information 24
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