MAX1776 查看數據表（PDF） - Maxim Integrated
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MAX1776 Datasheet PDF : 13 Pages
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24V, 600mA Internal Switch, 100% Duty Cycle,
Step-Down Converter
ABSOLUTE MAXIMUM RATINGS
IN, SHDN, ILIM, ILIM2 to GND .................................-0.3V to 25V
LX to GND.......................................................-2V to (VIN + 0.3V)
OUT, FB to GND .........................................................-0.3V to 6V
Peak Input Current .................................................................. 2A
Maximum DC Input Current.............................................. 500mA
Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW
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
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, VIN = +12V, SHDN = IN, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
Input Voltage Range
Input Supply Current
Input Supply Current in Dropout
Input Shutdown Current
VIN
IIN
IIN(DROP)
No load
No load
SHDN = GND
Input Undervoltage Lockout
Threshold
Output Voltage (Preset Mode)
Feedback Set Voltage
(Adjustable Mode)
VUVLO
VOUT
VFB
VIN rising
VIN falling
FB = GND
OUT Bias Current
OUT Pin Maximum Voltage
VOUT = 5.5V
FB Bias Current
FB Dual Mode™ Threshold Low
IFB
VFB = 1.3V
LX Switch Minimum Off-Time
LX Switch Maximum On-Time
tOFF(MIN)
tON(MAX) VFB = 1.3V
ILIM = ILIM2 = GND
VIN = 6V
ILIM = GND, ILIM2 = IN
ILIM = IN, ILIM2 = GND
LX Switch On-Resistance
RLX
ILIM = ILIM2 = IN
ILIM = ILIM2 = GND
VIN = 4.5V
ILIM = GND, ILIM2 = IN
ILIM = IN, ILIM2 = GND
ILIM = ILIM2 = IN
ILIM = ILIM2 = GND
LX Current Limit
ILIM = GND, ILIM2 = IN
ILX(PEAK) ILIM = IN, ILIM2 = GND
ILIM = ILIM2 = IN
LX Zero-Crossing Threshold
Zero-Crossing Timeout
LX does not rise above the threshold
LX Switch Leakage Current
VIN = 24V,
LX = GND
Dual Mode is a trademark of Maxim Integrated Products, Inc.
TA = +25°C
TA = 0°C to +85°C
MIN
4.5
3.6
3.5
4.80
1.212
1.65
-25
50
0.22
8
120
240
480
960
-75
TYP
15
50
3
4.0
3.9
5.00
1.25
3.5
100
0.42
10
1.6
0.8
0.4
0.4
1.9
1.0
0.5
0.5
150
300
600
1200
30
MAX
24
28
70
7
4.4
4.3
5.20
UNITS
V
µA
µA
µA
V
V
1.288
V
6.25
µA
5.5
V
+25
nA
150
mV
0.62
µs
12
µs
3.2
1.6
0.8
0.8
Ω
3.8
1.9
0.95
0.95
180
360
mA
720
1440
+75
mV
µs
1
µA
10
2 _______________________________________________________________________________________
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