MAX1637 Просмотр технического описания (PDF) - Maxim Integrated
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MAX1637 Datasheet PDF : 20 Pages
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Miniature, Low-Voltage,
Precision Step-Down Controller
ABSOLUTE MAXIMUM RATINGS
GND to PGND .............................................................+2V to -2V
LX, BST to GND......................................................-0.3V to +36V
BST, DH to LX...........................................................-0.3V to +6V
VCC, VGG, CSL, CSH, SHDN to GND.......................-0.3V to +6V
DL to GND..................................................-0.3V to (VGG + 0.3V)
REF, SKIP, SYNC, CC to GND ...................-0.3V to (VCC + 0.3V)
REF Output Current.............................................................20mA
REF Short-Circuit to GND ..............................................Indefinite
Operating Temperature Range ...........................-40°C to +85°C
Continuous Power Dissipation (TA = +70°C)
QSOP (derate 8.3mW/°C above +70°C) ......................667mW
Storage Temperature Range .............................-65°C to +160°C
Junction Temperature ......................................................+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, VCC = VGG = 5V, SYNC = VCC, IREF = 0mA, TA = 0°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C.)
PARAMETER
SMPS CONTROLLER
Input Voltage Range
Output Voltage
Output Adjustment Range
Current-Limit Threshold
Power Consumption
Shutdown Supply Current
FB Input Current
Soft-Start Ramp Time
Idle-Mode Switchover Threshold
AC Load Regulation
INTERNAL REFERENCE
VCC Undervoltage Lockout Threshold
VGG Undervoltage Lockout Threshold
REF Output Voltage
REF Load Regulation
REF Line Regulation
OSCILLATOR
Oscillator Frequency
Maximum Duty Factor
SYNC Input Pulse Width High
SYNC Input Pulse Width Low
SYNC Input Rise/Fall Time
SYNC Input Frequency Range
CONDITIONS
VCC, VGG
FB tied to VOUT, 0mV < (CSH - CSL) < 80mV,
includes line and load regulation
VCC = 5V
VCC = 3.3V
CSH > CSL
CSH < CSL
Output not switching
VCC = VGG = 5V
VCC = VGG = 3.3V
SHDN = GND, VCC = VGG
VFB = VREF
SHDN to full current limit, four levels
CSH - CSL
CSH - CSL = 0mV to CSH - CSL = 100mV
Rising edge, hysteresis = 15mV
Rising edge, hysteresis = 15mV
REF load = 0µA
REF load = 0µA to 50µA
VCC = 3.15V to 5.5V
SYNC = VCC
SYNC = GND
SYNC = VCC
SYNC = GND
(Note 1)
MIN TYP MAX UNITS
3.15
1.080
VREF
VREF
80
-145
-50
20
1.100
100
-100
1.5
1
0.5
512
30
2
5.5
V
1.120
V
5.5
V
3.6
120
mV
-55
2.5
mW
1.75
3
µA
50
nA
clocks
40
mV
%
2.80
3.05
V
2.80
3.05
V
1.080 1.100 1.120
V
10
mV
3
mV
270
300
330
kHz
170
200
230
89
92
%
93
96
200
ns
200
ns
200
ns
240
340 kHz
2 _______________________________________________________________________________________
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