參數(shù)資料
型號： MAX1637
廠商： Maxim Integrated Products, Inc.
英文描述： Miniature, Low-Voltage, Precision Step-Down Controller
中文描述： 微型、低電壓、高精度降壓型控制器
文件頁數(shù)： 2/20頁
文件大?。?/td> 211K
代理商： MAX1637
M
Miniature, Low-Voltage,
Prec ision S tep-Down Controller
2
_______________________________________________________________________________________
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
V
CC
, V
GG
, CSL, CSH,
SHDN
to GND.......................-0.3V to +6V
DL to GND..................................................-0.3V to (V
GG
+ 0.3V)
REF,
SKIP
, SYNC, CC to GND ...................-0.3V to (V
CC
+ 0.3V)
REF Output Current.............................................................20mA
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
CC
= V
GG
= 5V, SYNC = V
CC
, I
REF
= 0mA,
T
A
= 0°C to +85°C
, unless otherwise noted. Typical values are at
T
A
= +25°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.
REF Short-Circuit to GND ..............................................Indefinite
Operating Temperature Range ...........................-40°C to +85°C
Continuous Power Dissipation (T
A
= +70°C)
QSOP (derate 8.3mW/°C above +70°C)......................667mW
Storage Temperature Range.............................-65°C to +160°C
J unction Temperature......................................................+150°C
Lead Temperature (soldering, 10sec) .............................+300°C
SYNC = GND
SYNC = V
CC
SYNC = V
CC
FB tied to V
OUT
, 0mV < (CSH - CSL) < 80mV,
includes line and load regulation
V
CC
= 5V
V
CC
= 3.3V
CSH > CSL
CSH < CSL
V
CC
= 3.15V to 5.5V
REF load = 0μA to 50μA
V
CC
, V
GG
REF load = 0μA
Rising edge, hysteresis = 15mV
Rising edge, hysteresis = 15mV
SHDN
= GND, V
CC
= V
GG
V
FB
= V
REF
CSH - CSL = 0mV to CSH - CSL = 100mV
CSH - CSL
SHDN
to full current limit, four levels
CONDITIONS
170
89
200
92
230
Oscillator Frequency
kHz
270
300
330
mV
3
REF Line Regulation
OSCILLATOR
mV
10
REF Load Regulation
V
1.080
1.100
1.120
REF Output Voltage
V
2.80
3.05
V
GG
Undervoltage Lockout Threshold
V
2.80
3.05
V
CC
Undervoltage Lockout Threshold
%
2
AC Load Regulation
INTERNAL REFERENCE
mV
20
30
40
Idle-Mode Switchover Threshold
clocks
512
Soft-Start Ramp Time
nA
-50
50
FB Input Current
V
3.15
5.5
Input Voltage Range
μA
0.5
3
Shutdown Supply Current
V
1.080
1.100
1.120
Output Voltage
V
REF
V
REF
80
-145
5.5
3.6
120
-55
2.5
1.75
Output Adjustment Range
V
UNITS
MIN
TYP
MAX
PARAMETER
100
-100
1.5
1
Current-Limit Threshold
mV
Output not switching
Power Consumption
mW
SYNC = GND
ns
ns
200
200
SYNC Input Pulse Width High
SYNC Input Pulse Width Low
%
93
96
Maximum Duty Factor
(Note 1)
kHz
240
340
SYNC Input Frequency Range
ns
200
SYNC Input Rise/Fall Time
V
CC
= V
GG
= 5V
V
CC
= V
GG
= 3.3V
SMPS CONTROLLER
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