参数资料
型号: MAX1844EEP+T
厂商: Maxim Integrated Products
文件页数: 3/24页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 20-QSOP
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 600kHz
电源电压: 4.5 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 20-SSOP(0.154",3.90mm 宽)
包装: 带卷 (TR)
High-Speed Step-Down Controller with
Accurate Current Limit for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, V CC = V DD = 5V, SKIP = GND, T A = 0 ° C to +85 ° C , unless otherwise noted. Typical values are at
T A = +25 ° C.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
REF Sink Current
REF Fault Lockout Voltage
REF in regulation
Falling edge, hysteresis = 40mV
10
1.6
μA
V
Overvoltage Trip Threshold
(Fixed-Threshold Mode)
With respect to error comparator threshold, no load
OVP = GND, rising edge, hysteresis = 1%
External feedback, measured at FB with respect to
V OVP , 1V < V OVP < 1.8V, rising edge, hysteresis =1%
12
-30
14.5
17
+30
%
mV
Overvoltage Comparator Offset
(Adjustable-Threshold Mode)
Internal feedback, measured at OUT with respect to the
nominal OUT regulation voltage, 1V < V OVP < 1.8V,
-3.5
+3.5
%
rising edge, hysteresis = 1%
OVP Input Leakage Current
Overvoltage Fault
Propagation Delay
1V < V OVP < 1.8V
FB forced 2% above trip threshold
-100
0
1.5
+100
nA
μs
Output Undervoltage Protection
Trip Threshold (Fixed-Threshold
With respect to error comparator threshold, UVP = V CC
65
70
75
%
Mode)
Output Undervoltage Protection
Trip Threshold (Adjustable-
Threshold Mode)
External feedback, measured at FB with respect to
V UVP , 0.4V < V UVP < 1V
Internal feedback, measured at OUT with respect to the
nominal OUT regulation voltage, 0.4V < V UVP < 1V
-40
-5
+40
+5
mV
%
UVP Input Leakage Current
Output Undervoltage Protection
Blanking Time
PGOOD Trip Threshold (Lower)
PGOOD Trip Threshold (Upper)
0.4V < V UVP < 1V
From rising edge of SHDN
With respect to error comparator threshold, no load
With respect to error comparator threshold, no load
-100
10
-12.5
8
<1
-10
10
+100
30
-8
12.5
nA
ms
%
%
PGOOD Propagation Delay
PGOOD Output Low Voltage
PGOOD Leakage Current
ILIM Adjustment Range
FB forced 2% beyond PGOOD trip threshold, falling
I SINK = 1mA
High state, forced to 5.5V
0.25
10
0.4
1
3
μs
V
μA
V
Current-Limit Threshold (Fixed)
GND - V CS , ILIM = V CC
90
100
110
mV
Current-Limit Threshold
(Adjustable)
GND - V CS
V ILIM = 0.5V
V ILIM = 2V
40
170
50
200
60
230
mV
Current-Limit Threshold
(Negative Direction)
Current-Limit Threshold
(Zero Crossing)
Thermal Shutdown Threshold
V CC Undervoltage
Lockout Threshold
GND - V CS , SKIP = V CC , ILIM = V CC ,T A = +25 ° C
GND - V CS, SKIP = GND
Hysteresis = 10 ° C
Rising edge, hysteresis = 20mV,
PWM disabled below this level
-140
4.1
-117
3
150
-95
4.4
mV
mV
° C
V
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3
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